1. The utility model provides a novel abrasionproof coal feed mouth of CFB boiler which characterized in that: the coal feeding channel is communicated with the tail end of the coal spreading air channel, the upper end of the coal feeding channel is communicated with a coal firing channel, a coal feeding port at the bottom of the coal spreading air channel is provided with a wear-resistant stainless steel air deflector, an included angle between the wear-resistant stainless steel air deflector and a horizontal plane is 15 degrees, the right end face of the wear-resistant stainless steel air deflector is connected with an anti-abrasion plate, the included angle between the anti-abrasion plate and the horizontal plane is 45 degrees, and the anti-abrasion plate is provided with a plurality of flow guide anti-abrasion blocks.

2. The novel anti-abrasion coal feeding port of the CFB boiler according to claim 1, wherein: the guide anti-abrasion blocks comprise tangential guide blocks and rectangular anti-abrasion strips, a plurality of tangential guide blocks and a plurality of rectangular anti-abrasion strips are arranged on the anti-abrasion plate, two rows of the tangential guide blocks are arranged on the anti-abrasion plate in parallel from top to bottom, and the two rows of the tangential guide blocks are arranged at intervals to form an anti-abrasion guide flow distribution layer; three rows of the rectangular wear-resistant strips are arranged on the wear-resistant plate in parallel from top to bottom to form a self-wear-resistant layer.

3. The novel anti-abrasion coal feeding port of the CFB boiler according to claim 2, wherein: the section of the upper end surface of the tangential diversion block is a quarter circular arc, and the vertical end of the tangential diversion block is vertical to the wear-resistant plate.

4. The novel anti-abrasion coal feeding port of the CFB boiler according to claim 3, wherein: the upper and lower rows of the anti-abrasion diversion flow-dividing layer are respectively provided with four tangential diversion blocks and five tangential diversion blocks, so that the impacted coal flow is divided into 9 strands of small-flow coal flows through the tangential diversion blocks.

5. The novel anti-abrasion coal feeding port of the CFB boiler according to claim 2, wherein: the anti-abrasion diversion flow distribution layer and the self-abrasion layer are arranged in a fan shape with a narrow top and a wide bottom.

Background

The circulating fluidized bed boiler has high combustion adaptability and has great advantages in the aspects of combustion of inferior coal, treatment of municipal sludge and garbage and disposal of coal slime. As a high-efficiency clean combustion technology of coal, the installed capacity of a domestic large circulating fluidized bed unit is increased year by year. However, the particle size of the coal supplied to the pulverized coal furnace is larger than that of the pulverized coal furnace, so that the problem of abrasion of the coal supplied port is more prominent. The coal feeding port is one of the most important devices in daily operation of the circulating fluidized bed unit, and the operation state of the coal feeding port directly determines whether the circulating fluidized bed unit can operate for a long period. To meet such a demand, an all-round improvement of the coal feeding port is required.

Disclosure of Invention

In order to solve the defects of the prior art, the novel abrasion-proof coal feeding port of the CFB boiler is provided, so that the problem that the coal feeding port of the existing large-sized circulating fluidized bed unit in service is seriously abraded to influence the long-period operation of the unit is solved.

The invention provides a novel anti-abrasion coal feeding port of a CFB boiler, which aims to realize the purpose of the invention and comprises a coal feeding channel and a coal spreading air channel which are arranged on the side wall of a hearth, wherein the coal feeding channel is communicated with the tail end of the coal spreading air channel, the upper end of the coal feeding channel is communicated with a coal feeding channel, a wear-resistant stainless steel air deflector is arranged at the coal feeding port at the bottom of the coal spreading air channel, the included angle between the wear-resistant stainless steel air deflector and the horizontal plane is 15 degrees, the right end surface of the wear-resistant stainless steel air deflector is connected with an anti-abrasion plate, the included angle between the anti-abrasion plate and the horizontal plane is 45 degrees, and a plurality of flow guide anti-abrasion blocks are.

The anti-abrasion and anti-wear device is further improved, the flow guide anti-wear block comprises a plurality of tangential flow guide blocks and a plurality of rectangular anti-wear strips, the plurality of tangential flow guide blocks are arranged on the anti-wear plate in parallel from top to bottom, and the two rows of tangential flow guide blocks are arranged at intervals to form an anti-abrasion and flow guide flow distribution layer; three rows of the rectangular wear-resistant strips are arranged on the wear-resistant plate in parallel from top to bottom to form a self-wear-resistant layer.

In a further improvement, the section of the upper end surface of the tangential diversion block is a quarter of a circular arc, and the vertical end of the tangential diversion block is perpendicular to the wear-resistant plate.

In a further improvement, the upper and lower rows of the anti-abrasion diversion flow-dividing layer are respectively provided with four tangential diversion blocks and five tangential diversion blocks, so that the impacted coal flow passes through the tangential diversion blocks and is divided into 9 strands of small-flow coal flows.

In a further improvement, the anti-abrasion diversion flow distribution layer and the self-abrasion layer are arranged in a sector shape with a narrow top and a wide bottom.

The invention has the beneficial effects that:

compared with the prior art, the novel abrasion-proof coal feeding port of the CFB boiler, provided by the invention, has the advantages that the original common steel plate at the position of the coal feeding port is upgraded into an abrasion-proof stainless steel material, and the abrasion-proof coal feeding port has good toughness and strong thermoplasticity. The wear resistance is higher than that of the conventional steel material; the wear-resistant stainless steel air deflector is arranged at the coal feeding port where the coal-spreading air enters, the material of the wear-resistant stainless steel air deflector is wear-resistant stainless steel, the included angle between the wear-resistant stainless steel air deflector and the horizontal plane is 15 degrees, the coal-spreading is not influenced, the air direction of the coal-spreading air entering the coal feeding port can be properly adjusted, coal particles are prevented from being washed to the upper area of the coal feeding port, the coal particles enter a hearth distribution area and are slightly lifted upwards after the air direction of the coal-spreading air is changed, most of the coal particles are prevented from falling on the wear-resistant plate, and more coal particles are brought into a hearth; aiming at the problem that a small part of coal particles still fall on an anti-abrasion plate area, the anti-abrasion plate is abraded, according to the previous abrasion experience and rule, all the flow guide anti-abrasion blocks do not need to be covered on the anti-abrasion plate, and only the flow guide anti-abrasion blocks are installed at the seriously abraded part and are combined by adopting different anti-abrasion mechanisms, so that the anti-abrasion effect is finally achieved.

The diversion anti-wear block is composed of an anti-wear diversion layer and a self-anti-wear layer, the anti-wear diversion layer and the self-anti-wear layer are arranged in a fan shape with a narrow upper part and a wide lower part, the anti-wear diversion layer is composed of an upper tangential drainage block and a lower tangential drainage block, and the tangential drainage anti-wear principle is adopted.

This fabrication has three effects: wear-proof, flow-guiding and flow-dividing

1. Wear prevention: coal particles entering a furnace are rushed to the tangential drainage block in a direction of 60 degrees from a horizontal included angle, due to the radian design of the tangential drainage block, the particles enter the wear-resistant plate in a tangential direction, the resistance received by the particles entering in the tangential direction is minimum according to a stress analysis principle, in reverse, the impact force received by the wear-resistant plate is minimum, the particles are thrown for the second time after passing through the tangential drainage block with the radian, the wear-resistant plate is well protected, and the fluidization effect on the wear-resistant plate of the circulating fluidized bed boiler is better.

2. Flow guiding: the particle size of the material entering the circulating fluidized bed boiler is basically all solid particles smaller than 10mm, the height of the tangential drainage block is 5mm, the radian radius is 5mm, the diameter of the tangential drainage block is 10mm, and the tangential drainage block can be suitable for the diversion effect of all the material particles entering the boiler.

3. Shunting: 4 tangential drainage blocks are arranged in the first row at equal intervals, so that the impacted coal flow is divided into 9 small-flow coal flows through the tangential drainage blocks (wherein 4 tangential drainage blocks in the first row are performed on 4 coal flows, and the rest 5 coal flows enter the second row), the impact force of the coal flows is dispersed, and the functions of shunting and preventing abrasion are achieved. The second row of tangential diversion blocks is a good complement of the first row, and 5 small strands of particles diverted from the first row are diverted.

The self-abrasion-proof layer consists of three rows of rectangular abrasion-proof strips which are arranged in parallel from top to bottom, and the principle is as follows: due to the tangential drainage effect of the anti-abrasion diversion flow distribution layer, most particles are guided to enter the hearth, the speed of coal particles entering the hearth is low when the coal particles are flushed to the anti-abrasion layer, the coal particles are deposited between the rectangular anti-abrasion strips and the included angle of the anti-abrasion plate, a natural anti-abrasion belt is formed, when other subsequent particles which impact the anti-abrasion belt, the particles which are firstly impacted are stopped in the included angle, the anti-abrasion bottom plate is not directly flushed, and the self-abrasion effect is achieved.

The novel anti-abrasion coal feeding port of the CFB boiler can solve the problem that the coal feeding port of the existing large-sized circulating fluidized bed unit is seriously abraded to influence the long-term operation of the unit.

Drawings

The following detailed description of embodiments of the invention is provided in conjunction with the appended drawings, in which:

FIG. 1 is a schematic structural view of a conventional coal supply port;

FIG. 2 is a schematic diagram of the distribution of coal particles at a conventional coal feed port;

FIG. 3 is a schematic structural view of the present invention;

FIG. 4 is an enlarged view of the coal feed port of FIG. 3;

FIG. 5 is a schematic view of the wear plate of the present invention;

fig. 6 is a schematic view of the wear prevention principle of the present invention.

Detailed Description

As shown in fig. 1-6, the novel abrasion-proof coal feeding port of a CFB boiler provided by the present invention comprises a coal feeding channel 1 and a coal feeding air channel 2 which are arranged on a side wall of a furnace 200, the coal feeding channel 1 is communicated with a terminal of the coal feeding air channel 2, an upper end of the coal feeding channel 1 is communicated with a coal entering channel 3, a wear-resistant stainless steel air deflector 4 is installed at a coal feeding port 100 at a bottom of the coal feeding air channel 2, an included angle between the wear-resistant stainless steel air deflector 4 and a horizontal plane is 15 degrees, a wear-proof plate 5 is connected to a right end surface of the wear-resistant stainless steel air deflector 4, an included angle between the wear-proof plate 5 and the horizontal plane is 45 degrees, a plurality of flow-guiding abrasion-proof blocks are arranged on the wear-proof plate 5, the flow-guiding abrasion-proof blocks comprise a tangential flow-guiding block 61 and a rectangular abrasion-proof strip 62, and the tangential flow-proof blocks 61 and the rectangular abrasion-proof strip 62 are both arranged in a plurality. Two rows of the tangential diversion blocks 61 are arranged on the wear-resistant plate in parallel from top to bottom, and the two rows of the tangential diversion blocks 61 are arranged at intervals to form a wear-resistant diversion flow distribution layer; the section of the upper end surface of the tangential diversion block 61 is a quarter of a circular arc, and the vertical end of the tangential diversion block is perpendicular to the wear-resistant plate. The upper and lower rows of the anti-abrasion diversion flow-dividing layer are respectively provided with four tangential diversion blocks 61 and five tangential diversion blocks 61, so that the impacted coal flow passes through the tangential diversion blocks 61 and is divided into 9 strands of small-flow coal flows. Three rows of rectangular wear strips 62 are arranged in parallel from top to bottom on the wear plate to form a self-wear layer. The anti-abrasion diversion flow distribution layer and the self-abrasion layer are arranged in a sector shape with a narrow top and a wide bottom.

Specifically, to length being 900mm, the width is 810 mm's coal feed mouth size, among this technical scheme, wear-resisting stainless steel aviation baffle 4's cross-section is isosceles triangle, and its waist is 58mm, and the base is 30mm, and wear-resisting plate 5's length is 900mm, and the width is 480mm, and 45 with horizontal ground contained angle, the ascending tangential drainage piece 61 of abrasionproof water conservancy diversion reposition of redundant personnel layer, totally 4, 4 tangential drainage piece 61 intervals 56mm, every length 80mm, height 5mm, the upper surface radian of tangential drainage piece 61 is for using 5mm as the 1/4 circular arcs of radius. The descending tangential diversion blocks 61 of the anti-abrasion diversion flow distribution layer are 5 blocks in total, the interval between the 5 tangential diversion blocks 61 is 80mm, the length of each block is 56mm, the height of each block is 5mm, and the radian of the upper surface of the tangential diversion block 61 is 1/4 circular arcs taking 5mm as the radius.

The three rectangular wear strips 62 from the top to the bottom of the wear layer have the following dimensions in sequence: the length is 700mm, the height is 10mm, and the thickness is 3 mm; the length is 750mm, the height is 10mm, and the thickness is 3 mm; the length is 800mm, the height is 10mm, the thickness is 3mm, and the rectangular wear strip 62 is vertically arranged on the wear-resistant plate.

The above embodiments are not limited to the technical solutions of the embodiments themselves, and the embodiments may be combined with each other into a new embodiment. The above embodiments are only for illustrating the technical solutions of the present invention and are not limited thereto, and any modification or equivalent replacement without departing from the spirit and scope of the present invention should be covered within the technical solutions of the present invention.