1. A flue gas distributor controlled according to outlet temperature difference is characterized in that a plurality of guide plates which are arranged in a staggered mode are arranged in the flue gas distributor, each guide plate comprises a fixed guide plate and an adjustable guide plate, and the adjustable guide plates are connected with a driving mechanism; under the action of the driving mechanism, the adjustable guide plate can extend or retract a set distance relative to the fixed guide plate so as to change the area of the guide plate; the two sides of the smoke outlet of the smoke distributor are respectively provided with a temperature sensor, the temperature sensors detect smoke temperatures of two side positions of the smoke outlet, the temperature sensors are in data connection with the controller, the controller reads the detected temperatures and calculates temperature difference, and the controller automatically controls the driving mechanism to adjust the adjustable guide plate according to the calculated temperature difference so as to relatively fix the guide plate to extend out or retract for a set distance to change the area of the guide plate.

2. The flue gas distributor according to the outlet temperature difference control of claim 1, wherein the controller controls the driving mechanism to adjust the adjustable baffle to extend relative to the fixed baffle when the calculated temperature difference exceeds a certain value, and controls the driving mechanism to adjust the adjustable baffle to retract relative to the fixed baffle when the calculated temperature difference is less than a certain value.

3. The flue gas distributor controlled according to the outlet temperature difference as claimed in claim 2, wherein the driving mechanism comprises a pulley mounted at the bottom of the adjustable guide plate, and the pulley is connected with the inner wall of the flue gas distributor through a traction mechanism;

the traction mechanism comprises a motor, a steel cable wheel and a spring pipe, and the spring pipe is arranged between the inner wall of the smoke distributor and the pulley; the steel cable wheel is connected with the motor, and is wound with a steel cable which is connected with the inner wall of the smoke distributor by a pulley;

the controller automatically controls the driving motor to drive the steel cable wheel to rotate outwards or inwards according to the calculated temperature difference, so that the flow guide area of the adjustable flow guide plate is controlled.

4. The flue gas distributor according to claim 3 wherein the controller controls the motor to drive the cable wheel to rotate outwardly to increase the area of the baffle plate when the calculated temperature difference exceeds a predetermined value, and controls the motor to drive the cable wheel to rotate inwardly to decrease the area of the baffle plate when the calculated temperature difference is less than a predetermined value.

5. The flue gas distributor controlled according to the outlet temperature difference as claimed in claim 1, wherein the temperature sensors are respectively disposed at the first flue gas outlet and the third flue gas outlet.

6. The flue gas distributor according to the outlet temperature difference control of claim 2, wherein the driving mechanism further comprises a slide rail, and the slide rail is installed on both sides of the pulley.

7. The boiler system is characterized by further comprising a boiler, wherein a flue gas outlet is formed in the top of the boiler and is connected with a flue; an air preheater, a low-temperature economizer and a dust remover are sequentially arranged in the flue, a flue gas distributor is arranged between the air preheater and the low-temperature economizer, and the flue gas distributor is the flue gas distributor as claimed in any one of claims 1 to 6.

8. A distributor for distributing flue gas is characterized in that a plurality of guide plates which are arranged in a staggered mode are arranged in the distributor.

Background

The L-shaped flue gas distributor is common equipment of an outlet flue of the air preheater and is used for equally distributing flue gas at an outlet of a flue gas side of the air preheater, reducing the flow of the flue gas at the inlet of a single dust remover and improving the dust removal efficiency. The low-temperature coal economizer is arranged at the outlet of the distributor and the inlet of the dust remover, so that the exhaust gas temperature can be further reduced, the boiler efficiency is improved, and the pollutant emission is reduced. The performance of the distributor has important significance for stable and efficient operation, energy conservation, emission reduction and the like of the thermal power generating unit. The flue gas flow, ash amount and temperature uniformity of the branch flue at the downstream of the distributor are important indexes for evaluating the performance of the distributor. The traditional flue gas distributor realizes the uniformity of the flue gas and ash amount of each branch flue in a branch flue outlet throttling mode, but a reliable means for solving the problem of non-uniform temperature of the flue gas at the outlet of the distributor is not provided yet. The maximum temperature difference of each branch flue at the downstream of the traditional flue gas distributor is higher than 50 ℃, and the running stability of downstream equipment is seriously damaged.

A large thermal power generating unit generally adopts a rotary air preheater to recover waste heat of a tail flue, and a heat exchange mode of periodic flow heat storage enables flue gas at an outlet of the air preheater to have larger temperature difference in the tangential direction, and the maximum temperature difference in the tangential direction of the rotary air preheater can reach 100 ℃ under normal operation conditions. If the air preheater has serious problems of ash blockage, corrosion, air leakage and the like under the long-term operation condition, the tangential temperature difference of the flue gas at the outlet of the air preheater is far higher than 100 ℃. The tangential huge temperature difference of the flue gas at the outlet of the air preheater enables the temperature of the flue gas at the inlet of the distributor to be uneven, the mixing length in the distributor is limited, the flue gas is difficult to be completely mixed, and finally the temperature of the flue gas at the outlet of the distributor is uneven.

The too big influence that causes the operation of flue gas temperature deviation behind air preheater export flue gas distributor:

usually, a low-temperature economizer is arranged between the air preheater and the dust remover and used for recovering the waste heat of the flue gas, and at present, condensed water is commonly used for recovering the heat. Generally, the low-temperature coal economizer of each flue gas flow passage in front of the dust remover has the same heat exchange area and heat exchange capacity. If the flue gas temperature deviation is large, the flue gas temperature of some flow passages is lower than the original design value, and the flue gas temperature of some flow passages is higher than the original design value. Under the condition that the flue gas temperature is lower than the design value of the inlet flue gas temperature of the low-temperature economizer, the heat exchange area of the low-temperature economizer of the flow channel is excessive, so that waste is caused, and if the flue gas temperature is equivalent to the design value of the outlet flue gas temperature of the low-temperature economizer, the low-temperature economizer on the flow channel cannot be put into operation, namely, the flue gas resistance is increased, and the economic benefit on heat is not obtained. Under the condition that the flue gas temperature is higher than the design value of the inlet flue gas temperature of the low-temperature economizer, the heat exchange area of the low-temperature economizer of the flow channel is insufficient, although some allowance exists when the low-temperature economizer is selected, if the flue gas temperature exceeds the design value too much, the outlet flue gas temperature of the low-temperature economizer cannot be reduced to the outlet flue gas temperature of the designed low-temperature economizer, and heat waste is caused.

The heat exchange areas and the like of the low-temperature economizers on each channel are the same, the inlet flue gas temperatures are different, in order to reach the same outlet flue gas temperature, the condensate flow of each low-temperature economizer is different, and a regulating valve is further arranged on a water pipeline of each low-temperature economizer, so that the operation and regulation are difficult. The temperature of the inlet of the low-temperature economizer has deviation, while the temperature of the outlet of the low-temperature economizer is the same, so that the actual flue gas volume deviation of each channel is aggravated, the flue gas volume deviation in each channel of the dust remover is caused, and the dust removal effect is influenced to a certain extent.

The utility model provides a flue gas distributor that area can be adjusted in earlier application, through setting up adjustable guide plate, can increase or reduce the area of guide plate according to actual need to the size of adjustment flue gas mixing degree and resistance satisfies different heat conduction actual need but above-mentioned regulation has the hysteresis quality, can't carry out intelligent control moreover.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a flue gas distributor and a boiler system which can intelligently control the area, the area of an adjustable guide plate is controlled by setting related parameters, the area of the guide plate can be increased or reduced according to actual needs, and different actual heat conduction needs are met; so as to realize the requirement of further heat exchange and prolong the service life of the product.

In order to achieve the purpose, the invention is realized by the following technical scheme:

a flue gas distributor controlled according to outlet temperature difference is characterized in that a plurality of guide plates which are arranged in a staggered mode are arranged in the flue gas distributor, each guide plate comprises a fixed guide plate and an adjustable guide plate, and the adjustable guide plates are connected with a driving mechanism; under the action of the driving mechanism, the adjustable guide plate can extend or retract a set distance relative to the fixed guide plate so as to change the area of the guide plate; the two sides of the smoke outlet of the smoke distributor are respectively provided with a temperature sensor, the temperature sensors detect smoke temperatures of two side positions of the smoke outlet, the temperature sensors are in data connection with the controller, the controller reads the detected temperatures and calculates temperature difference, and the controller automatically controls the driving mechanism to adjust the adjustable guide plate according to the calculated temperature difference so as to relatively fix the guide plate to extend out or retract for a set distance to change the area of the guide plate.

Preferably, when the calculated temperature difference exceeds certain data, the controller controls the driving mechanism to adjust the adjustable guide plate to extend out relative to the fixed guide plate, and when the calculated temperature difference is less than certain data, the controller controls the driving mechanism to adjust the adjustable guide plate to retract relative to the fixed guide plate.

Preferably, the driving mechanism comprises a pulley arranged at the bottom of the adjustable guide plate, and the pulley is connected with the inner wall of the smoke distributor through a traction mechanism;

the traction mechanism comprises a motor, a steel cable wheel and a spring pipe, and the spring pipe is arranged between the inner wall of the smoke distributor and the pulley; the steel cable wheel is connected with the motor, and the steel cable is wound on the steel cable wheel and connected with the inner wall of the smoke distributor by winding the pulley.

The controller automatically controls the driving motor to drive the steel cable wheel to rotate outwards or inwards according to the calculated temperature difference, so that the flow guide area of the adjustable flow guide plate is controlled.

Preferably, when the calculated temperature difference exceeds a certain data, the controller controls the motor to drive the steel cable wheel to rotate outwards to increase the area of the guide plate, and when the calculated temperature difference is less than a certain data, the controller controls the motor to drive the steel cable wheel to rotate inwards to reduce the area of the guide plate.

Preferably, the temperature sensors are respectively arranged at the first smoke outlet and the third smoke outlet.

Preferably, the driving mechanism further comprises a sliding rail, and the sliding rail is mounted on two sides of the pulley.

The boiler system is characterized by further comprising a boiler, wherein a flue gas outlet is formed in the top of the boiler and is connected with a flue; an air preheater, a low-temperature economizer and a dust remover are sequentially arranged in the flue, a flue gas distributor is arranged between the air preheater and the low-temperature economizer, and the flue gas distributor is the flue gas distributor.

The beneficial effects of the above-mentioned embodiment of the present invention are as follows:

(1) according to one or more embodiments of the invention, through the arrangement of the adjustable guide plate, the area of the guide plate can be increased or decreased according to actual needs, so that the mixing degree of the flue gas and the resistance are adjusted, and different actual heat conduction needs are met; the temperature difference of different positions of the outlet is calculated, so that the temperature difference of the outlet flue gas is automatically controlled to keep a certain range, the temperature of the outlet flue gas is kept balanced, and the temperature difference is kept in a certain range.

(2) According to one or more embodiments of the invention, the adjustable guide plate is connected with the driving mechanism, can be stretched and contracted, can play a role in descaling the guide plate, and can improve the heat exchange effect.

(3) According to one or more embodiments of the invention, the guide plate structure of the flue distributor is optimized by calculating the radius of the guide plate, so that the optimal outlet flue gas temperature equalization effect is achieved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.

FIG. 1 is a schematic block diagram of a boiler system according to one or more embodiments of the present invention;

FIG. 2 is a schematic structural view of a prior art L-shaped flue gas distributor;

FIG. 3 is a schematic diagram of a flue gas distributor according to one or more embodiments of the present invention;

FIG. 4 is a front view of a flue gas distributor according to one or more embodiments of the present invention;

FIG. 5 is a top view of a flue gas distributor according to one or more embodiments of the present invention;

FIG. 6 is a left side view of a flue gas distributor according to one or more embodiments of the present invention;

FIG. 7 is a perspective view of a flue gas distributor according to one or more embodiments of the present invention;

FIG. 8 is a parameter diagram of the present disclosure in accordance with one or more embodiments;

FIG. 9 is a schematic illustration of a drive mechanism according to one or more embodiments of the present disclosure;

FIG. 10 is a top view of a drive mechanism according to one or more embodiments of the present invention;

FIG. 11 is a side view of a drive mechanism according to one or more embodiments of the present invention.

Wherein, 1-the ash bucket is connected with a flange; 2-upper guard board; 3-lower guard board; 4-bottom guard board; 5-ash bucket interface; 6-flue outlet guard board; 7-flue outlet flange; 8-a flow guide plate; 81-fixed deflector; 82-an adjustable baffle; 9-a framework; 10-flue outlet support truss; 11-horizontal force diagonal bracing; 12-horizontal force diagonal bracing; 13-upright column; 14-upright post; 15-upright post; 16-a column; 17-supporting; 18-supporting; 19-square manhole; 20-a steel plate;

21-flue gas inlet; 22-a first flue gas outlet; 23-a second flue gas outlet; 24-a third flue gas outlet; 26-fine ash slatted doors; 27-H section bar; 28-steel plate; 29-H section bar; 30-H section bar; 31-H section bar; 32-H section bar; 33-a non-metallic expansion joint; 34-boiler, 35-air preheater, 36-low temperature economizer, 37-dust remover, 38-flue gas distributor; 381-vertical portion; 382-a horizontal part; 39-a pulley; 40-a steel cord; 41-a lash compensator; 42-distributor outer wall steel plate; 43-a steel cord hub; 44-a motor; 45-a spring tube; 46-slide rail.

Detailed Description

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an", and/or "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;

for convenience of description, the words "up", "down", "left" and "right" in this application, if any, merely indicate correspondence with the directions of up, down, left and right of the drawings themselves, and do not limit the structure, but merely facilitate the description of the invention and simplify the description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the application.

The terms "mounted", "connected", "fixed", and the like in the present application should be understood broadly, and for example, the terms "mounted", "connected", and "fixed" may be fixedly connected, detachably connected, or integrated; the two components can be connected directly or indirectly through an intermediate medium, or the two components can be connected internally or in an interaction relationship, and the terms can be understood by those skilled in the art according to specific situations.

The first embodiment is as follows:

the embodiment provides an area-controlled flue gas distributor, as shown in fig. 3, the flue gas distributor 38 of the embodiment is an L-shaped structure, and includes a vertical portion 381 and a horizontal portion 382, one end of the vertical portion 381 is communicated with one end of the horizontal portion 382, and the other end is a flue gas inlet 21; the horizontal portion 382 is divided into a plurality of flue gas outlets at the other end.

In the present embodiment, three smoke outlets are provided, namely a first smoke outlet 22, a second smoke outlet 23 and a third smoke outlet 24. Preferably, vertical portion 381 and horizontal portion 382 are rectangular in cross-section.

Due to the different flue gas temperatures at different positions in the flue, the problem of uneven flue gas temperature distribution exists in the three flue gas outlets connected at the tail of the flue gas distributor 38, and as shown in fig. 2, the temperature difference between the first flue gas outlet 22 and the third flue gas outlet 24 can reach 60 ℃.

In order to solve the problem of uneven temperature of the flue gas at the outlet of the distributor, a plurality of guide plates 8 are arranged inside the vertical part 381, and in the embodiment, two guide plates 8 are arranged and are arc-shaped. The guide plates 8 are arranged on two corresponding side walls inside the vertical part 381, and the guide plates 8 extend from the side walls to the inside of the vertical part 381; and the two deflectors 8 are arranged in a staggered manner.

In this embodiment, the height direction of the vertical portion 381 is taken as the vertical direction, the direction of the flue gas outlet is taken as the left direction, the direction opposite to the direction of the flue gas outlet is taken as the right direction, and the direction perpendicular to the flue gas outlet is taken as the front-back direction. One baffle 8 is disposed on the left or right side of the front side wall, and the other baffle 8 is disposed on the right or left side of the rear side wall corresponding to the front side wall, thereby achieving the staggered arrangement. Further, the position that guide plate 8 and lateral wall are connected sets up at the top of side, through setting up at the top for vertical portion 381 inner space is enough big enough in order to satisfy intensive mixing.

This embodiment is through setting up two curved guide plates 8 for partly guide to opposite direction along the guide plate 8 flow of the flue gas that gets into flue gas distributor 38, with the flue gas intensive mixing that opposite direction got into, thereby realize that the temperature of flue gas is even, avoid the uneven problem that leads to of export flue gas.

As shown in fig. 4 and 7, each baffle 8 comprises a fixed baffle 81, an adjustable baffle 82, and the adjustable baffle 82 is connected to a driving mechanism. The fixed baffle 81 is disposed above the adjustable baffle 82, and the adjustable baffle 82 can extend from a lower portion of the fixed baffle 81 at least a portion to increase the baffle area and can retract to a lower portion of the fixed baffle at least a portion to decrease the baffle area.

When the adjustable guide plate 82 is extended from the lower portion of the fixed guide plate 81 by the maximum area as viewed from the upper portion of the vertical portion 381 downward (as viewed from the top in the height direction), the connection width of each guide plate at the side wall in planar projection is 50% of the side wall width W. The maximum area of the adjustable baffle 82 extending from the lower portion of the fixed baffle 81 is such that in plan projection each baffle extends from a side wall to the interior of the upright portion 381 by 50% of the distance L between the two side walls.

Through the size design, on one hand, the guide plates can be distributed in the space as much as possible, the temperature is sufficiently and uniformly realized, the short circuit phenomenon in the flue gas flow can be avoided, the flue gas is prevented from flowing out from one direction, and the flue gas can be mixed to achieve an optimal structure.

Through setting up adjustable guide plate 82, can increase or reduce the area of guide plate according to actual need to the size of adjustment flue gas mixing degree and resistance satisfies different heat conduction actual need. For example, the adjustable guide plate can be retracted to reduce the flow resistance when the temperature uniformity meets the requirement, and the guide plate can be extended out of a part to increase the sufficient mixing of the flue gas when the temperature uniformity does not meet the requirement. Through the setting of adjustable guide plate 82, can carry out the scale removal to the guide plate, avoid the guide plate scale deposit to become grey.

Further, as shown in fig. 9 to 10, the driving mechanism includes a pulley 39, a wire rope 40, a wire rope hub 43, a motor 44, and a spring tube 45, and the wire rope hub 43 and the motor 44 are disposed outside the two distributor outer wall steel plates 42 on the left or right. The lower part of the adjustable deflector 82 is connected with the pulley 39 through a connecting part, preferably, the connecting part is connected to the position of the shaft part of the pulley 39.

Spring tubes 45 are connected to two sides of the pulley 39, and the spring tubes 45 are hollow round tubes; the spring tube 45 is provided with a channel which is used for connecting the components to move therein; a spring is arranged in the spring pipe 45, one end of the spring is connected with the pulley 39, and the other end of the spring is connected with the inner wall of the distributor outer wall steel plate 42. The cable 40 extends from the inner wall of the two distributor outer wall steel plates 42 to the left or right, passes around the pulley 39 and then is wound into a cable drum 43, said cable drum 43 being connected to a motor 44. Wherein, the motor 44, the cable wheel 43 and the spring tube 45 form a traction mechanism.

The driving mechanism further comprises a sliding rail 46, as shown in fig. 11, the sliding rail 46 is installed below the adjustable guide plate 82 and installed along the length direction of the guide plate 8 to ensure that the adjustable guide plate 82 can slide when stretching. In this embodiment, two slide rails 46 are provided, and are respectively disposed near the end of the adjustable guide plate 82; at least one slide rail 46 is provided on the side wall in the front or rear direction, and the pulley 39 is provided between the two slide rails 46.

In operation, when the area of the deflector 8 needs to be increased, the motor 44 drives the cable wheel 43 to rotate outwards, then drives the cable 40 to move outwards, and the cable 40 drives the pulley 39 to move outwards, so as to drive the adjustable deflector 82 to move outwards, thereby increasing the deflector area of the deflector. When less area of the deflector 8 is needed, the motor 44 drives the cable wheel 43 to rotate inward, then the cable 40 is driven to move inward, the cable 40 drives the pulley 39 to move inward, and therefore the adjustable deflector 82 is driven to move inward, so as to reduce the deflector area of the deflector.

As an improvement, temperature sensors are respectively arranged on two sides (front and back directions) of a smoke outlet of the smoke distributor, the temperature sensors detect smoke temperatures of two side positions of the smoke outlet, the temperature sensors are in data connection with a controller, the controller reads the detected temperatures and calculates temperature difference, and the controller automatically controls a driving mechanism to adjust an adjustable guide plate to extend or retract a set distance relative to a fixed guide plate according to the calculated temperature difference so as to change the area of the guide plate.

Preferably, the controller automatically controls the driving motor 44 to drive the cable drum 43 to rotate outwards or inwards according to the calculated temperature difference, so as to control the flow guide area of the adjustable flow guide plate 82.

Preferably, when the calculated temperature difference exceeds certain data, the controller controls the driving mechanism to adjust the adjustable guide plate to extend out relative to the fixed guide plate, and when the calculated temperature difference is less than certain data, the controller controls the driving mechanism to adjust the adjustable guide plate to retract relative to the fixed guide plate.

Preferably, when the calculated temperature difference exceeds a certain value, the controller controls the motor 44 to drive the steel cable wheel 43 to rotate outwards to increase the area of the deflector 8, and when the calculated temperature difference is less than a certain value, the controller controls the motor 44 to drive the steel cable wheel 43 to rotate inwards to decrease the area of the deflector 8. This application is through calculating the different position temperature differences in export to automatic control export flue gas temperature difference keeps the certain limit, makes export flue gas temperature keep balanced, thereby makes the temperature difference keep in the certain limit.

Preferably, when the calculated temperature difference becomes larger, the controller controls the motor 44 to drive the cable wheel 43 to rotate outwards to increase the area of the baffle 8, and when the calculated temperature difference becomes smaller, the controller controls the motor 44 to drive the cable wheel 43 to rotate inwards to decrease the area of the baffle 8. This application is through calculating the different position temperature differences in export to automatic control export flue gas temperature difference keeps invariable size, makes export flue gas temperature keep balanced, thereby makes the temperature difference keep in certain extent.

Preferably, the temperature sensors are respectively arranged at the first smoke outlet and the third smoke outlet.

As an improvement, a pressure sensor is arranged at a smoke outlet of the smoke distributor, the pressure sensor detects the smoke pressure degree of the smoke outlet, the pressure sensor is in data connection with a controller, the controller reads detected pressure data, and the controller automatically controls a driving mechanism to adjust an adjustable guide plate to extend or retract a set distance relative to a fixed guide plate according to the detected pressure so as to change the area of the guide plate.

Preferably, the controller automatically controls the motor 44 to drive the cable wheel 43 to rotate outwards or inwards according to the pressure, so as to control the flow guide area of the adjustable flow guide plate 82.

Preferably, the controller automatically controls the driving motor 44 to drive the cable drum 43 to rotate outward or inward according to the detected pressure, thereby controlling the flow guide area of the adjustable flow guide 82.

Preferably, when the calculated pressure exceeds a certain data, the controller controls the driving mechanism to adjust the adjustable guide plate to retract relative to the fixed guide plate, and when the calculated pressure is less than a certain data, the controller controls the driving mechanism to adjust the adjustable guide plate to extend relative to the fixed guide plate.

Preferably, when the calculated pressure is less than a certain value, the controller controls the motor 44 to drive the cable wheel 43 to rotate outwards to increase the area of the baffle plate 8, and when the calculated pressure is greater than a certain value, the controller controls the motor 44 to drive the cable wheel 43 to rotate inwards to decrease the area of the baffle plate 8. This application is through calculating outlet pressure data to automatic control outlet flue gas pressure keeps the certain limit, makes outlet flue gas pressure keep balanced, avoids pressure too big, makes the temperature reach the equilibrium as far as simultaneously, thereby makes pressure keep in the certain limit.

Preferably, when the calculated pressure becomes lower, the controller controls the motor 44 to drive the cable wheel 43 to rotate outwards to increase the area of the baffle 8, and when the calculated pressure becomes higher, the controller controls the motor 44 to drive the cable wheel 43 to rotate inwards to decrease the area of the baffle 8. This application is through calculating the outlet pressure difference to automatic control export flue gas pressure keeps invariable size, makes the temperature reach the equilibrium as far as simultaneously, thereby makes pressure keep in certain extent.

Preferably, the pressure sensors are respectively arranged at the first flue gas outlet, the second flue gas outlet and the third flue gas outlet. The motor 44 is controlled to move by calculating the average pressure at the flue gas outlet.

As shown in fig. 8, a chord inclination angle θ formed by a connecting line between the top ends of the front and rear side walls and a connecting line between two end points of the deflector 8, a chord tangent angle Φ formed by a tangent line between the other end of the deflector 8 far from the side walls and a connecting line between two end points of the deflector 8, a height of the vertical portion 381 is H (a distance from the uppermost end of the vertical portion to the upper end surface of the horizontal portion), and a distance from the intersection point of the two deflectors 8 to the upper end surface of the horizontal portion 382 is H; the distance between the two side walls is L.

The arrangement mode of the guide plate 8 should comprehensively consider flow division, mixing, resistance, vibration, ash discharge and the like, the chord inclination angle theta of the guide plate 8 is not too small, otherwise the static pressure and the dynamic pressure on the surface of the guide plate 8 are higher, and the flow resistance is increased; the size is not too large, otherwise, the occupied space is too large, and the structure size is complex; the inclination angle is less, and the ash granule should not be from the board surface landing, and the surface ash is serious on the guide plate 8 for guide plate 8 is difficult to support. The chord cutting angle phi of the guide plate 8 is not too high, and is also not beneficial to ash discharge. The empty section h should not be too small, otherwise the local flow velocity near the ash bucket is too high, which is not beneficial to ash discharge of the ash bucket.

Preferably, H is more than or equal to 1/3H and phi is less than or equal to 20 degrees under the allowable condition of spatial arrangement, and the radius of the circular arc-shaped guide plate 8 can be calculated according to the following formula:

（1）

in the embodiment, the chord inclination angle theta = 45-60 degrees of the deflector 8.

If the condition that H is more than or equal to 1/3H is difficult to satisfy, namely H is less than 1/3H, the radius of the guide plate is calculated by H, and the calculation formula is as follows:

（2）

preferably, the chord inclination angle θ =30 to 60 °, further preferably θ =45 to 60 °, of the baffle 8.

When θ is equal to or lower than 30 °, a straight plate is preferably used.

To prevent the vibration of the baffle 8, it is preferable that the thickness of the baffle 8 is not less than 5 mm.

Through the design of the radius R of the guide plate, the temperature of the flue gas distributor 38 can reach the optimal temperature equalizing effect under the condition of meeting the heat exchange and smoke exhaust requirements.

The guide plate is supported by support rods, and the support rods preferably have the outer diameter not less than 38mm and the inner diameter not less than 4 mm. The transverse support rods are arranged on the leeward side of the guide plate, the arrangement number and the arrangement distance of the transverse support rods are the same as those of H-shaped reinforcing ribs outside the smoke distributor, and the transverse support rods are welded in a flush joint mode. The longitudinal support rod penetrates through the guide plate and is welded on the guide plate in the circumferential direction. The longitudinal support rod is welded with the transverse support rod. The longitudinal support bars are at the same distance in the length direction as the transverse support bars, and the distance in the width direction is not higher than W/8.

As shown in fig. 4-7, the outer side of the flue gas distributor 38 is reinforced by a plurality of protective plates, the upper protective plates 2 are mounted on the outer sides of the vertical part 381 of the flue gas distributor 38, and the upper protective plates 2 are used for reinforcing the wall plate of the upper flue; the horizontal portion 382 is provided with a lower panel 3 on the outer side of the panel, and the lower panel 3 is located below the upper panel 2 to reinforce the panel of the lower flue. The horizontal portion 382 is provided at its bottom with a bottom panel 4 for reinforcing the wall panel at the bottom of the flue. The ash bucket connecting flange 1 of the flue gas distributor 38 is used for connecting the nonmetal compensator at the outlet of the air preheater 35.

An ash hopper interface 5 is arranged at the bottom of the flue gas distributor 38, and the ash hopper interface 5 is used for discharging accumulated ash at the bottom and discharging washing water of the air preheater; the ash hopper interface 5 is provided with a fine ash inserting plate door 26, and the fine ash inserting plate door 26 is used for controlling ash discharge at the bottom of the ash hopper. And a flue outlet protective plate 6 is arranged outside the flue gas outlet of the flue gas distributor 38 and used for reinforcing a horizontal flue wall plate of the flue gas outlet. The flue gas outlet is provided with a flue gas outlet flange 7 and is connected with other subsequent components through the flue gas outlet flange 7.

A flue outlet support truss 10 is arranged inside the flue gas outlet to reinforce the flue outlet. The flue gas distributor 38 is connected with the horizontal force diagonal brace 11 on one side and connected with the horizontal force diagonal brace 12 on the other side, and the horizontal force diagonal brace 11 and the horizontal force diagonal brace 12 are arranged on the front side and the rear side of the flue gas distributor 38 and used for stabilizing the whole flue component. One end of the horizontal force inclined strut 11, which is far away from the vertical part 381, is connected with an H-shaped material 30, the H-shaped material 30 is connected with a steel plate 20, and the steel plate 20 is used for reinforcing the bracket; the end of the horizontal force stay 12 remote from the vertical part 381 is connected to the H-profile 31.

The outer side of the flue gas distributor 38 supports the vertical flue through a plurality of vertical columns, and in this embodiment, since the cross section of the flue is rectangular, a vertical column is disposed at each corner of the horizontal portion 382, that is, the vertical column 13, the vertical column 14, the vertical column 15, and the vertical column 16 are respectively installed at one corner of the outer side of the horizontal portion 382.

And supports 17 and 18 are symmetrically arranged at the bottom of the flue gas outlet and are used for supporting the horizontal flue. A square manhole 19 is provided at one side of the horizontal portion 382 for an inspection person to get in and out of the inside of the flue. H-shaped materials 27 are symmetrically arranged on two sides of the vertical portion 381 and used for manufacturing a limiting support hanger; the outer side of the H-shaped section 27 is connected with a steel plate 28, and the steel plate 28 is an angle steel and is used for manufacturing a limiting support hanger. An H-shaped section 32 is arranged above the smoke outlet, the H-shaped section 32 is fixed with the vertical portion 381, steel plates 28 are symmetrically arranged on two sides of the H-shaped section 32, and the steel plates 28 are angle steels.

Example two:

the embodiment provides a boiler system, as shown in fig. 1, including a boiler 34, a flue gas outlet arranged at the top of the boiler 34, the flue gas outlet being connected to a flue, an air preheater 35, a low-temperature economizer 36 and a dust remover 37 being arranged in the flue in sequence, wherein a flue gas distributor 38 described in the first embodiment is arranged between the air preheater 35 and the low-temperature economizer 36.

Further, the flue gas distributor 38 is connected with the low-temperature economizer 36 through the non-metal expansion joint 33, and the flue gas flows through the low-temperature economizer 36 and is heated and returned to the water, and then enters the dust remover 37. The ash bucket connecting flange 1 of the flue gas distributor 38 is connected with the nonmetal compensator at the outlet of the air preheater 35.

In operation, pulverized coal is combusted in a hearth to generate flue gas, the flue gas generated in the boiler 34 enters an air preheater 35, and primary air and secondary air are heated and then enter a flue gas distributor 38; the flue gas from the flue gas distributor 38 is divided into multiple paths, and the paths are respectively fed into a plurality of low-temperature economizers 36, the flue gas is respectively fed into a dust remover 37 for dust removal after the boiler is heated in the low-temperature economizers 36 to return water, and the flue gas after dust removal is discharged through a chimney.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.