1. The utility model provides a pressure boost tower for empty, its characterized in that, includes air compression system (1) and is used for the drive driving system (2) of air compression system (1), inlet end (1 a) of air compression system (1) is connected with air filter (3), the end (1 b) of giving vent to anger of air compression system (1) and air cooling system intercommunication of air separation system, air compression system (1) still is provided with control system, control system includes data acquisition module, data analysis module and execution module, data acquisition module is used for gathering the parameter of admitting air and the parameter of giving vent to anger of air compression system (1), data analysis module is used for analyzing the parameter of admitting air and the parameter of giving vent to anger, control execution module work, adjustment the parameter of admitting air and/or the parameter of giving vent to anger.

2. A pressurized column for air separation according to claim 1, characterized in that said air compression system (1) comprises a plurality of stages of air compressors (11) connected in series, said data acquisition module comprises pressure sensors (121) arranged between said air inlet end (1 a), said air outlet end (1 b) and each two stages of said compressors (11), and said execution module comprises a gas flow regulator (131) arranged at said air inlet end (1 a) and behind said air filtering device (3).

3. A pressurized column for air separation according to claim 2, wherein said implementation module further comprises a vent valve (125) disposed on said outlet end (1 b).

4. The supercharging tower for air separation according to claim 2, wherein the air compression system (1) further comprises a plurality of air cooling devices (14) arranged between the air compressors (11) in multiple stages, the data acquisition module further comprises a plurality of temperature sensors (122) arranged between the air compressors (11) in multiple stages, two adjacent compressors are communicated with each other through a first air conveying pipe, the temperature sensors (122) and the air cooling devices (14) are arranged on the first air conveying pipes, the temperature sensors (122) on each first air conveying pipe are located downstream of the air cooling devices (14), and the execution module comprises an adjusting device (132) for adjusting the cooling rate of the air cooling devices (14).

5. A pressurized tower for air separation according to claim 4, wherein said air cooling means (14) is a water-cooled radiator and said regulating means (132) comprises a throttle valve (1321) provided on the water duct of a plurality of said air cooling means (14).

6. A pressurized column for air separation according to claim 5, wherein a plurality of said air cooling devices (14) are provided in series in the air transporting direction, and said throttle valve (1321) is provided on a water intake manifold communicating with a cooling water source.

7. A pressurized column for air separation according to claim 6, wherein each of said air cooling devices (14) is further provided with a water inlet branch (140) communicating with said water inlet manifold, and said regulating device (132) further comprises a solenoid valve (1322) provided on each of said water inlet branches (140).

Background

The air separation plant control system is divided into an air compressor system, an air precooling system, a molecular sieve purification system, a booster turboexpander system, a fractionating tower system and the like, and the working principle is as follows: the air compression system compresses air to preset pressure, the compressed air is cooled by the air precooling system, carbon dioxide, acetylene and other hydrocarbons in the air are removed by the molecular sieve purification system to obtain pure air, the booster turboexpander system is a refrigeration system of the air separation device, the fractionating tower fractionates the air to obtain pure liquid oxygen and liquid nitrogen, the air compression system mainly compresses the air by the air compressor to obtain compressed air of the preset pressure, and the gas flow of the air compressor is kept basically constant under the working state.

When the flow in the compressor is unstable due to a decrease in gas entering the compressor at a given pressure, the compressor will begin to surge. Surge is usually manifested as rapid flow and pressure oscillations that cause extreme compressor flow and pressure instability, resulting in reduced compressor efficiency, reduced life, and serious damage, and therefore an anti-surge control system must be employed to ensure safe operation of the equipment.

Disclosure of Invention

In view of the above problems, the present application provides a pressurized column for air separation to solve the technical problems set forth in the background art.

The invention provides a booster tower for air separation, which comprises an air compression system and a power system for driving the air compression system, wherein an air inlet end of the air compression system is connected with an air filtering device, an air outlet end of the air compression system is communicated with an air pre-cooling system of an air separation device, the air compression system is also provided with a control system, the control system comprises a data acquisition module, a data analysis module and an execution module, the data acquisition module is used for acquiring air inlet parameters and air outlet parameters of the air compression system, and the data analysis module is used for analyzing the air inlet parameters and the air outlet parameters and controlling the execution module to work and adjust the air inlet parameters and/or the air outlet parameters.

Further, the air compression system comprises a plurality of stages of air compressors connected in sequence, the data acquisition module comprises pressure sensors arranged at the air inlet end, the air outlet end and between each two stages of compressors, and the execution module comprises a gas flow regulator arranged at the air inlet end and behind the air filtering device.

Further, the execution module further comprises an emptying valve arranged on the air outlet end.

Furthermore, the execution module further comprises a backflow gas circuit communicated with the gas outlet end and the gas inlet end, and a second electromagnetic valve is arranged on the backflow gas circuit.

Further, the air filtering device is a pulse type self-cleaning air filtering device, and the execution module further comprises a self-cleaning system of the air filtering device.

Further, the air compression system is still including setting up at multistage a plurality of air cooling device between the air compressor, the data acquisition module is still including setting up at multistage a plurality of temperature sensor between the air compressor, adjacent two communicate through first gas-supply pipe between the compressor, temperature sensor with air cooling device all sets up on the first gas-supply pipe, and every on the first gas-supply pipe temperature sensor all is located air cooling device's low reaches, the execution module is including the adjusting device who is used for adjusting a plurality of air cooling device cooling rate.

Further, the air cooling device is a water-cooling radiator, and the adjusting device comprises throttle valves arranged on water pipelines of the air cooling devices.

Furthermore, the plurality of air cooling devices are sequentially arranged in series along the conveying direction of air, and the throttle valve is arranged on a water inlet main pipe communicated with a cooling water source.

Furthermore, each air cooling device is also provided with a water inlet branch communicated with the water inlet main pipe, and the adjusting device also comprises an electromagnetic valve arranged on each water inlet branch.

Further, the water inlet of each of the water inlet branches is located downstream of the throttle valve.

Further, be located the second level compressor low reaches air cooling device all includes first cooling unit and second cooling unit, first cooling unit's water inlet with it is linked together to intake the branch road, the water inlet of second cooling unit with first cooling unit's delivery port, the last level air cooling device are linked together, the delivery port of second cooling unit with the next level air cooling device is linked together, just first cooling unit is located the low reaches of second cooling unit.

The invention provides a pressurizing tower for air separation, which is characterized in that a control system is arranged in an air compression system, so that air parameters can be prevented from entering a surge area by adjusting air inlet parameters of an air inlet end and air outlet parameters of an air outlet end when air is compressed by the air compression system, the phenomenon of surge generated by the air compression system during compression can be effectively avoided, the damage to a compressor due to surge is avoided, the service life and the maintenance cost of the air compression system are prolonged, and the energy consumption of an air compression process is reduced.

Drawings

Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings.

FIG. 1 is a schematic diagram of a pressurized column for air separation according to the present invention.

FIG. 2 is a schematic structural diagram of an air cooling device in a booster column for air separation provided by the invention.

Fig. 3 is a schematic structural diagram of a control system in a pressurized column for air separation according to the present invention.

FIG. 4 is a flow chart of a process for compressing air by a booster column for air separation according to the present invention.

Detailed Description

The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

The surging phenomenon is a common phenomenon when a gas compressor works, and can cause a gas compressor unit to generate severe vibration and bring a lot of harm to the unit: firstly, as the core rotor components are gears and impellers which move at high speed in the machine head, when the machine set vibrates violently, the rotor collides with the volute, the rotor and the volute are damaged, and serious mechanical accidents are caused. Secondly, when surging occurs, the gas pressure in the exhaust pipeline can fluctuate violently, so that the working stability of downstream production equipment is influenced, and the production process of the whole project is seriously influenced. The triple surge can cause the unit to generate howling, thereby increasing the noise of the whole unit. And fourthly, the vibration of the unit can increase the fatigue strain times of rotating parts such as bearings, shafts, gears and the like, shorten the service life of the rotating parts, and damage important parts in advance. And finally, the surge can damage the shaft seal, the gas seal and the oil seal of the compressor, so that the leakage of compressed gas or lubricating oil is caused, and the leakage of production gas can be caused, thereby causing production accidents. And sixthly, if the compressor unit is an electric drive type compressor unit, the surge can cause the load change of a drive motor of the compressor, and the normal operation of other large equipment in an adjacent power grid can be influenced.

Example one

For the generation of surge, the invention provides a booster tower for air separation, which can eliminate the surge phenomenon in the process of compressing air by an air separation device, prolong the service life of an air compressor unit in a compression system, and reduce energy consumption, and specifically, referring to fig. 1-3, as a specific implementation manner, the booster tower comprises an air compression system 1 and a power system 2 for driving the air compression system 1, an air inlet end 1a of the air compression system 1 is connected with an air filtering device 3, an air outlet end 1b of the air compression system 1 is communicated with an air pre-cooling system of the air separation device, the air compression system 1 is further provided with a control system, the control system comprises a data acquisition module, a data analysis module and an execution module, the data acquisition module is used for acquiring air inlet parameters and air outlet parameters of the air compression system 1, the data analysis module is used for analyzing the air inlet parameters and the air outlet parameters and controlling the execution module to work and adjust the air inlet parameters and/or the air outlet parameters.

Specifically, the root cause of the surge phenomenon generated by the gas compressor during compression is directly related to the gas parameters of the changes of the gas pressure, the flow and the temperature at the gas inlet end and the gas outlet end of the air compressor, so that the surge phenomenon can occur when the gas inlet parameters and the gas outlet parameters are in a surge working condition area. Therefore, the air-separation pressurizing tower provided by the invention is provided with the control system, the control system is used for carrying out information acquisition and information processing on the air inlet parameter and the air outlet parameter of the air compression system, the data analysis module is used for storing the numerical data of the surge area of the compressor under various working conditions and establishing a database, and is used for acquiring the information acquired by each data acquisition module at any time and comparing the information with the information in the prestored database, when the parameter to enter the surge area appears, the execution module is used for carrying out independent adjustment or simultaneous adjustment on the air inlet parameter and the air outlet parameter in time, so that each gas parameter is ensured not to enter the surge area, the phenomenon of surge can be effectively eliminated, the damage to the compressor caused by surge is avoided, the service life and the maintenance cost of the air compression system are improved, and the energy consumption of the air compression process is reduced.

Further, referring to fig. 1, as a specific embodiment, the specific structure of the air compression system 1 is as follows: including multistage consecutive air compressor 11, can improve the pressure of air through the mode of multistage compression, can reduce the pressure difference between the intake pipe of the air compressor 11 of each grade and the outlet duct to can reduce the energy consumption, the data acquisition module is including setting up inlet end 1a, give vent to anger end 1b and per two-stage pressure sensor 121 between the compressor 11, the execution module is including setting up inlet end 1a and be in the gas flow regulator 131 in air filter device 3 rear.

Specifically, because the compressor is at the during operation, if the air input at the air inlet is not enough, if the outlet pressure of compressor is too big, under the rotational speed of invariant, the unit is suppressed pressure, thereby can lead to advancing and can lead to the surge production of compressor, through setting up a plurality of pressure sensor 121, when the air inlet of each air compressor and the pressure value of gas outlet will get into the surge zone time, the gas flow regulator 131 aperture through control execution module increases, the air input of increase inlet end, avoid the emergence of surge.

Further, the pressure difference Δ P between the inlet and the outlet of each stage of the compressor also generates a surge phenomenon when the value of Δ P exceeds a predetermined threshold, and as a preferred embodiment, the execution module further includes a vent valve 125 disposed on the outlet end 1b, the gas pressure at the outlet end 1b can be reduced by opening the vent valve, the gas flow rate can be increased, and thus the adjustment of the gas pressure at the inlet and the outlet of each stage of the air compressor 11 in the air compression system can be performed, so that the pressure difference Δ P between the inlet end and the outlet end can be adjusted, and the adjustment range of Δ P is specifically: Δ P ≦ C2H, air pressure values at the inlet and outlet of each compressor are detected by a plurality of air pressure sensors 121, with the coefficient C2= C (T1/T2)^-2*φ²&ε^1/k；φ=H/V²Is a constant; t1 is the temperature of the air inlet of each stage of air compressor, T2 is the temperature of the air outlet of each stage of air compressor, the temperature can be collected by arranging a plurality of temperature sensors in the air compression system,&in order to obtain the stage flow coefficient, epsilon is the pressure ratio, epsilon is P1/P2, P1 is the air pressure value of the air outlet end 1b, P2 is the air pressure value of the air inlet end 1a, k is the specific heat ratio, V is the air flow in the air compression system, H is cn²*&2 where n is the rotational speed of the compressor, c is the number of stages of the air compressor 11 in the air compression system,&2 is an adjusting coefficient, the value range is 0.158-2.35, and the current delta of each air compressor is obtained by calculating the value acquired by the data acquisition moduleThe value of P, and thus the amount of bleed from the blow-down valve 125, can be controlled, and of course, by controlling the opening of the throttle valve, the amount of intake air can be increased to achieve the effect of reducing the pressure differential, and thus avoid surge.

Further, referring to fig. 1, as a specific implementation manner, the execution module further includes a backflow gas path 123 communicating the gas outlet end 1b with the gas inlet end 1a, the backflow gas path 123 is provided with a second electromagnetic valve 124, and the backflow gas path can be controlled through the electromagnetic valve, so that when the pressure at the gas outlet end is too high, the backflow gas path can be opened to enable air to flow back to the gas inlet end, thereby achieving the purpose of adjustment, and enabling the gas outlet parameter and the gas inlet parameter to be outside a surge area, thereby avoiding a surge phenomenon.

Further, specifically, referring to fig. 1, the air filtering device 3 is a pulse type self-cleaning air filtering device, the executing module further includes a self-cleaning system of the air filtering device 3, when the gas flow rate is still not changed much after the opening degree of the gas flow regulator 131 is increased, the air filtering device is considered to be caused by unsmooth air intake, and at this time, the data processing module can control the self-cleaning system of the air filtering device to work, so as to self-clean the air filtering device, and ensure the input amount of the gas.

Further, since the surge phenomenon is also related to the intake air temperature and the discharge air temperature between the compression stages, the higher the intake air temperature of each stage is, the more the compressor unit is operated at a constant pressure and constant speed, the more the surge is likely to occur. The change of the external environment temperature, such as high temperature, rarefied gas and light weight, is easy to surge in the case of the constant pressure compressor. In view of the above, referring to fig. 1 and fig. 2, the air compression system 1 of the present invention further includes a plurality of air cooling devices 14 disposed between the multistage air compressors 11, the data acquisition module further includes a plurality of temperature sensors 122 disposed between the multistage air compressors 11, two adjacent compressors are communicated with each other through a first air pipe, the temperature sensors 122 and the air cooling devices 14 are disposed on the first air pipes, the temperature sensor 122 on each first air pipe is located downstream of the air cooling device 14, and the execution module includes an adjusting device 132 for adjusting the cooling rates of the plurality of air cooling devices 14.

Specifically, the data processing module stores the numerical value of the surge temperature area of the air compressor under various working conditions, establishes a database, collects the gas temperature of the air inlet and the air outlet of each stage of compressor during working, controls the cooling rate of the air cooling device through the adjusting device 132 so as to adjust the temperature of the air inlet and the air outlet of each stage of compressor, and ensures that the temperature does not enter the surge area.

Further, referring to fig. 1 and fig. 2, as a specific embodiment, the air cooling device 14 is a water-cooled radiator, and the adjusting device 132 includes a throttle valve 1321 disposed on the water pipes of a plurality of the air cooling devices 14. Further, a plurality of the air cooling devices 14 are sequentially arranged in series along the air conveying direction, and the throttle valve 1321 is provided on a water inlet manifold communicated with a cooling water source.

Further, each air cooling device 14 is further provided with a water inlet branch 140 communicated with the water inlet manifold, and the adjusting device 132 further comprises a solenoid valve 1322 disposed on each water inlet branch 140. Specifically, when the gas temperature of each stage of the compressor increases and is about to enter the surge region, the opening of the throttle valve 1321 is controlled to increase, so that the flow rate of the cooling water entering the air cooling device is increased, and the air temperature between the stages is reduced.

Further, referring to fig. 2, as a preferred embodiment, the water inlet of each of the water inlet branches 140 is located downstream of the throttle valve 1321.

Further, the air cooling devices 14 located downstream of the compressor 11 in the second stage each include a first cooling unit 14a and a second cooling unit 14b, a water inlet of the first cooling unit 14a is communicated with the water inlet branch 140, a water inlet of the second cooling unit 14b is communicated with a water outlet of the first cooling unit 14a and the air cooling device 14 in the previous stage, a water outlet of the second cooling unit 14b is communicated with the air cooling device 14 in the next stage, and the first cooling unit 14a is located downstream of the second cooling unit 14 b.

It can be understood that when the air cooling units of each stage are connected in series, the effect of adjusting the gas temperature is not obvious the higher the water temperature is, and the corresponding electromagnetic valve 1322 can be opened when the adjustment of the cooling water temperature at the rear end is not obvious by arranging the water inlet branch and arranging the electromagnetic valve on the water inlet branch for control, so that the cooling water directly enters the air cooling device at the rear end to achieve the purpose of adjusting the air temperature; furthermore, through setting the air cooling device to include two units, can flow down the higher temperature rivers through the front end and carry out precooling back rethread rear end lower second cooling unit and cool off to can play better cooling effect.

Example two

The invention also provides a compression process for compressing air by using the air separation pressurizing tower, which comprises the following steps with reference to fig. 4: step one, controlling the air compression system 1 to work, and enabling air to pass through the air filtering device 3 to filter the air so as to remove impurities in the air.

And step two, the air is compressed by the air compression system 1, the air with preset pressure is output from the air outlet end, the air inlet parameter and the air outlet parameter of the air compressor 11 in the air compression system 1 are collected by the data collection module, and the collected air inlet parameter and the air outlet parameter are transmitted to the data analysis module.

And thirdly, the data analysis module controls the execution module to work through data analysis, and adjusts the gas inlet parameters and/or the gas outlet parameters to enable the gas parameters to be outside the surge area.

Further, the second step comprises: when the pressure sensor 121 of the acquisition module acquires that the gas flow in the air compression system 1 is insufficient, the gas flow is adjusted by controlling the opening of the gas flow regulator to increase, so that the gas flow parameter is out of the surge area.

Further, when the pressure difference Δ P between the air inlet and the air outlet of the air compressor 11 at each stage of the air compression system 1 is too large, the air pressure at the air outlet end 1b is released by opening the release valve 125, so as to increase the air flow rate, thereby adjusting the pressure of the air at the air inlet and the air outlet of the air compressor 11 at each stage of the air compression system, and thus adjusting the pressure difference Δ P between the air inlet and the air outlet of the air compressor 11 at each stage.

Further, when the pressure difference Δ P between the air outlet and the air inlet of the air compressor 11 at each stage of the air compression system 1 is too large, the second electromagnetic valve 124 may be opened by opening the air outlet end 1b under control, and the backflow air path is opened to adjust the pressure difference Δ P;

alternatively, the atmospheric valve 125 and the second solenoid valve 124 are opened simultaneously, and the pressure difference Δ P is adjusted.

Further, the second step further comprises: the air of the air compression system 1 is cooled by the gas cooling device 14, and the flow rate of cooling water is adjusted by adjusting the opening degree of the throttle valve 1321 to adjust the intake air temperature of each stage of the compressor 11, so as to ensure that the air temperature is outside the surge area.

Further, with the operation of the air compression system, the temperature of the air in each compression stage gradually rises, the effect of adjusting the temperature of the air is not obvious as the temperature of the water in the air cooling system located at the downstream is higher, and at the moment, the cooling water directly enters the air cooling device at the rear end by opening the control solenoid valve 1322, so that the aim of adjusting the air temperature is fulfilled.

Further, when the flow rate of the air flow in the air compression system does not change much by controlling the opening degree of the air flow regulator to increase, the self-cleaning system of the air filter device 3 is controlled to clean the air filter element.

EXAMPLE III

In order to verify the technical effect of the technical scheme of the invention, the following two tests are used for verification:

test one: the air separation is carried out by adopting a traditional mode, in particular to equipment which adopts a low-temperature rectification method for separation, changes air into liquid by a compression cycle deep freezing method, and gradually separates and produces inert gases such as oxygen, nitrogen, argon and the like from the liquid air according to different boiling points through low-temperature rectification.

And (2) test II: the technical scheme of the invention is adopted to increase air separation.

Through test comparison, the technical scheme of the invention can obviously avoid surge phenomenon, further improve the efficiency of air separation, improve the efficiency by 21.5-31.2% in the traditional test I and reduce the energy consumption by 11.8-17.3%.

The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.