First-stage and second-stage compression control system of carbon dioxide compressor

Abstract

The utility model discloses a first-stage and second-stage compression control system of a carbon dioxide compressor, which comprises a first-stage compressor and a second-stage compressor, the first-stage compressor is connected with a cooler through a first-stage compression pipeline, and the cooler is communicated with the second-stage compressor through a cooling pipeline. The output end of the second-stage compressor communicates with the high-pressure buffer tank through a second-stage compression pipeline, and the top of the high-pressure buffer tank is connected with a high-pressure output branch pipe. According to the first-stage and second-stage compression control system of the carbon dioxide compressor, tail gas subjected to first-stage compression and cooling is collected and used for blending high-temperature and high-pressure or high-temperature and low-pressure tail gas subjected to second-stage compression, so that the high-pressure tail gas is fused with the low-pressure tail gas, and the temperature of the tail gas can be blended in the low-pressure buffer tank; the pressure and the temperature of the fused high-pressure tail gas and low-pressure tail gas can meet the requirements of desulfurization equipment, and the temperature can be better adjusted.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of waste gas treatment equipment technical field, specifically a carbon dioxide compressor one, two-stage compression control system. BACKGROUND

[0002] In industrial waste gas carbon dioxide capture recovery project, such as coal-fired boiler flue gas carbon capture collaborative pollutant deep treatment project, first, discharge waste gas is separated out carbon dioxide by desorption tower absorption, after cooling by condenser and water removal by primary and secondary gas-liquid separation tank, two-stage compression is carried out by compressor set consisting of first compressor and second compressor, carbon dioxide is pressurized to a certain pressure, so as to subsequent processing.

[0003] According to the principle of thermodynamics, the power consumption of isothermal compression process is minimum, and the intermediate cooler is arranged between the two stages of compression, so that the gas is cooled isobarically after one-stage compression, and then enters the next stage cylinder after temperature reduction, which is more close to isothermal compression process compared with one-stage compression, and can greatly save power consumption.

[0004] Because two-stage compression divides gas into two times of compression, and the intermediate cooler reduces the temperature of tail gas after one-stage compression, the instability of pressure and the change of tail gas temperature will lead to the instability of output pressure and temperature, and the tail gas temperature and pressure also affect each other, the greater the pressure, the higher the temperature, the smaller the pressure, the lower the temperature, and the hydrolysis desulfurization process in subsequent hydrolysis desulfurization tower has requirements for tail gas pressure and temperature, therefore, temperature control and pressure control of carbon dioxide compressor one, two-stage compression are very important, which is directly related to the effect of subsequent desulfurization treatment, and for this reason, the temperature control and pressure control of existing carbon dioxide compressor one, two-stage compression are technically optimized and improved. SUMMARY

[0005] The utility model aims at providing a kind of carbon dioxide compressor one, two-stage compression control system to solve the problems raised in the above background.

[0006] To achieve the above object, the utility model provides the following technical scheme:

[0007] Carbon dioxide compressor one, two-stage compression control system, including one-stage compressor and two-stage compressor, one-stage compressor is connected with cooler by one-stage compression pipeline, cooler is connected with two-stage compressor by cooling pipeline, the output end of two-stage compressor is communicated with high-pressure buffer tank by two-stage compression pipeline, and the top of high-pressure buffer tank is connected with high-pressure output branch pipe.

[0008] As a further scheme of the utility model: cooling pipeline and primary compression pipeline are communicated with low pressure buffer tank through cooling tail gas branch pipe and high temperature tail gas branch pipe respectively, high pressure buffer tank and low pressure buffer tank are communicated through regulating pipeline, valve is arranged on regulating pipeline, cooling tail gas branch pipe and high temperature tail gas branch pipe.

[0009] As a further scheme of the utility model: the low pressure buffer tank still is provided with another pressure relief pipeline that is connected with the carbon dioxide gas input end of primary compressor, and the high pressure buffer tank and the low pressure buffer tank are provided with pressure sensor and temperature sensor, and the pressure relief pipeline is provided with a valve.

[0010] As a further scheme of the utility model: the low pressure buffer tank is provided with low pressure output branch pipe, and the low pressure buffer tank and the output end of low pressure output branch pipe are communicated with main pipeline.

[0011] As a further scheme of the utility model: the cooler includes kettle body, baffle, gas inlet chamber, exhaust chamber, exchange chamber, medium cavity and heat exchange pipeline, the kettle body is separated into gas inlet chamber, exhaust chamber, exchange chamber and medium cavity by baffle, the gas inlet chamber and exhaust chamber are communicated through heat exchange pipeline, the heat exchange pipeline is located in medium cavity, the heat exchange pipeline is also communicated with exchange chamber, tail gas enters heat exchange pipeline through gas inlet chamber, reaches exchange chamber from heat exchange pipeline, and is sent into exhaust chamber through heat exchange pipeline.

[0012] As a further scheme of the utility model: the gas inlet chamber is communicated with primary compression pipeline, the exhaust chamber is communicated with cooling pipeline, and the medium cavity is provided with medium input pipeline for medium input and medium output pipeline for medium output.

[0013] As a further scheme of the utility model: the bottom of exchange chamber is communicated with condensed water output pipeline.

[0014] Compared with the prior art, the utility model has the advantages that:

[0015] The carbon dioxide compressor one, two stage compression control system, through the collection of the tail gas of primary compression and cooling, is used for the tail gas regulating of high temperature and high pressure or high temperature and low pressure after two stage compression, makes its high pressure tail gas and low pressure fusion, and can regulate the tail gas temperature in low pressure buffer tank, makes its high pressure tail gas and low pressure tail gas pressure and temperature can meet the requirement of desulfurization equipment after fusion, can better regulate temperature. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a kind of carbon dioxide compressor one, two stage compression control system's structural schematic diagram;

[0017] Figure 2It is a kind of carbon dioxide compressor one, two stage compression control system in cooler structure diagram.

[0018] In the figure: 1, primary compressor;2, two stage compressor;3, cooler;301, kettle body;302, partition;303, gas inlet chamber;304, exhaust chamber;305, exchange chamber;306, medium cavity;307, heat exchange pipeline;4, cooling pipeline;5, primary compression pipeline;6, two stage compression pipeline;7, high pressure buffer tank;8, deployment pipeline;9, low pressure buffer tank;10, cooling tail gas branch;11, low pressure output branch;12, high pressure output branch;13, main pipeline;14, medium output pipeline;15, medium input pipeline;16, condensate water output pipeline;17, high temperature tail gas branch;18, pressure relief pipeline. DETAILED DESCRIPTION

[0019] Please refer to Figure 1 And 2 , the utility model embodiment, a kind of carbon dioxide compressor one, two stage compression control system, including primary compressor 1 and two stage compressor 2, primary compressor 1 is connected with cooler 3 by primary compression pipeline 5, cooler 3 is connected and communicated with two stage compressor 2 by cooling pipeline 4, the output end of two stage compressor 2 is communicated with high pressure buffer tank 7 by two stage compression pipeline 6, the top of high pressure buffer tank 7 is connected high pressure output branch 12, primary compressor 1 and two stage compressor 2 are set cooler 3 between stages, so that gas is cooled after being compressed first, reduce temperature and then enter the next stage cylinder, compared to primary compression, more close to isothermal compression process, can greatly save power consumption, the tail gas of two stage compressor 2 output enters high pressure buffer tank 7 buffering, so that its output tail gas is stable and uniform, while high pressure buffer tank 7 is internally prepared pressure sensor and temperature sensor, detect the state of tail gas after two stage compression, and the cooling efficiency of cooler 3 is adjusted according to the floating of pressure sensor and temperature sensor detection value by the control of existing control terminal host computer, the higher the temperature is, then improve the cooling efficiency of cooler 3, control tail gas flow speed by the reduction of valve opening degree, so that tail gas can carry out longer time heat exchange in cooler 3, further reduce tail gas temperature, thereby reduce the tail gas temperature of secondary compression, by the way, pressure is inconvenient, and the purpose of secondary compression tail gas temperature control is achieved by controlling interstage cooler 3 temperature control.

[0020] In a preferred embodiment, the cooling pipeline 4 and the primary compression pipeline 5 are respectively communicated with the low-pressure buffer tank 9 through the cooling tail gas branch pipe 10 and the high-temperature tail gas branch pipe 17, the high-pressure buffer tank 7 is communicated with the low-pressure buffer tank 9 through the regulating pipeline 8, the regulating pipeline 8, the cooling tail gas branch pipe 10 and the high-temperature tail gas branch pipe 17 are respectively provided with valves, the low-pressure buffer tank 9 is further provided with a pressure relief pipeline 18 having the other end connected with the carbon dioxide gas input end of the primary compressor 1, the high-pressure buffer tank 7 and the low-pressure buffer tank 9 are respectively provided with pressure sensors and temperature sensors, and the pressure relief pipeline 18 is provided with a valve. The tail gas in the primary compression pipeline 5 is subjected to primary compression, and thus the temperature of the tail gas is increased and the pressure is lower than that of the secondary compression. The tail gas in the cooling pipeline 4 is subjected to primary compression and cooling, and thus the temperature of the tail gas is decreased and the pressure is lower than that of the secondary compression. When the pressure in the high-pressure buffer tank 7 is high and the temperature is low, the tail gas in the primary compression pipeline 5 subjected to primary compression is introduced into the low-pressure buffer tank 9 through the pipeline, and the tail gas in the high-pressure buffer tank 7 having high pressure and low temperature is introduced into the low-pressure buffer tank 9 as low-pressure high-temperature tail gas, so as to reach the standard of the output interval value. When the pressure in the high-pressure buffer tank 7 is high and the temperature is high, the tail gas in the cooling pipeline 4 subjected to primary compression and cooling is introduced into the low-pressure buffer tank 9 through the pipeline, and the tail gas in the high-pressure buffer tank 7 having high pressure and high temperature is introduced into the low-pressure buffer tank 9 as low-pressure low-temperature tail gas, so as to reach the standard of the output interval value. The tail gas in the primary compression pipeline 5 and the cooling pipeline 4 can also be regulated by the valve opening degree to regulate the appropriate temperature in the high-pressure buffer tank 7, so as to finely adjust the pressure and temperature of the tail gas in the high-pressure buffer tank 7, to reach the standard of the output interval value, to achieve the purpose of controlling the temperature and pressure of the desulfurized tail gas. After the internal pressure of the low-pressure buffer tank 9 is discharged to balance, the tail gas cannot be completely discharged, and thus the tail gas is discharged through the pressure relief pipeline 18 to the primary compressor 1 having lower pressure for circulation.

[0021] In a preferred embodiment, the low-pressure buffer tank 9 is provided with a low-pressure output branch pipe 11, and the output ends of the high-pressure output branch pipe 12 and the low-pressure output branch pipe 11 are communicated with a main pipeline 13. When the temperature and pressure of the tail gas in the high-pressure buffer tank 7 meet the output requirements, the tail gas is output to the main pipeline 13 through the high-pressure output branch pipe 12, and the tail gas subjected to pressure regulation to meet the output requirements is introduced into the main pipeline 13 through the low-pressure output branch pipe 11.

[0022] In a preferred embodiment, the cooler 3 comprises a kettle body 301, a partition plate 302, an air inlet chamber 303, an air outlet chamber 304, an exchange chamber 305, a medium cavity 306 and a heat exchange pipeline 307, the kettle body 301 is divided into the air inlet chamber 303, the air outlet chamber 304, the exchange chamber 305 and the medium cavity 306 by the partition plate 302, the air inlet chamber 303 and the air outlet chamber 304 are communicated by the heat exchange pipeline 307, the heat exchange pipeline 307 is located in the medium cavity 306, the heat exchange pipeline 307 is also communicated with the exchange chamber 305, the exhaust gas enters the heat exchange pipeline 307 through the air inlet chamber 303, reaches the exchange chamber 305 from the heat exchange pipeline 307, and is sent into the air outlet chamber 304 through the heat exchange pipeline 307, the bottom of the exchange chamber 305 is communicated with a condensed water output pipeline 16, the high-temperature exhaust gas produces a certain amount of condensed water in the cooling process in the cooler 3, the compressor is used to compress the gas by the piston, and the cooling water cannot be compressed, too much condensed water entering the compressor will affect the operation of the compressor, therefore, the condensed water discharge port is arranged at the position of the exchange chamber 305, and the valve is used to control the timed drainage, so that the condensed water is discharged.

[0023] In a preferred embodiment, the air inlet chamber 303 is communicated with the first-stage compression pipeline 5, the air outlet chamber 304 is communicated with the cooling pipeline 4, the medium cavity 306 is provided with a medium input pipeline 15 for medium input and a medium output pipeline 14 for medium output, the medium is water, and the cooling tower is used to circulate the water, and the cooling water output by the cooling tower is sent into the medium cavity 306 to cool and reduce the temperature.

[0024] It should be noted that the above embodiments all belong to the same utility model concept, the description of each embodiment has different emphases, and the description not described in detail in the individual embodiments can be referred to the description in other embodiments.

[0025] The above-described embodiments only express the implementation of the utility model, the description is more specific and detailed, but it cannot be understood as the limitation of the utility model patent range. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the utility model, a number of modifications and improvements can be made, which all belong to the protection range of the utility model. Therefore, the protection range of the utility model patent should be subject to the appended claims.

Claims

1. A carbon dioxide compressor one-stage and two-stage compression control system, comprising a one-stage compressor (1) and a two-stage compressor (2), the one-stage compressor (1) being connected with a cooler (3) through a one-stage compression pipeline (5), the cooler (3) being connected in communication with the two-stage compressor (2) through a cooling pipeline (4), characterized in that, The output end of the secondary compressor (2) is communicated with the high-pressure buffer tank (7) through a secondary compression pipeline (6), and the top of the high-pressure buffer tank (7) is connected with a high-pressure output branch pipeline (12).

2. The carbon dioxide compressor one / two stage compression control system of claim 1, wherein, The cooling pipeline (4) and the primary compression pipeline (5) are respectively communicated with the low-pressure buffer tank (9) through a cooling tail gas branch pipeline (10) and a high-temperature tail gas branch pipeline (17), the high-pressure buffer tank (7) and the low-pressure buffer tank (9) are communicated through a regulating pipeline (8), and the regulating pipeline (8), the cooling tail gas branch pipeline (10) and the high-temperature tail gas branch pipeline (17) are all provided with valves.

3. The carbon dioxide compressor one / two stage compression control system of claim 2, wherein, The low-pressure buffer tank (9) is further provided with a pressure relief pipeline (18) having the other end connected with the carbon dioxide gas input end of the primary compressor (1), the high-pressure buffer tank (7) and the low-pressure buffer tank (9) are both provided with pressure sensors and temperature sensors, and the pressure relief pipeline (18) is provided with a valve.

4. The carbon dioxide compressor one / two stage compression control system of claim 2, wherein, The low-pressure buffer tank (9) is provided with a low-pressure output branch pipeline (11), and the output ends of the low-pressure buffer tank (9) and the low-pressure output branch pipeline (11) are communicated with a main pipeline (13).

5. The carbon dioxide compressor one-stage / two-stage compression control system of any of claims 1-4, wherein, The cooler (3) comprises a kettle body (301), a partition plate (302), an air inlet chamber (303), an air outlet chamber (304), an exchange chamber (305), a medium cavity (306) and a heat exchange pipeline (307), the kettle body (301) is divided into the air inlet chamber (303), the air outlet chamber (304), the exchange chamber (305) and the medium cavity (306) by the partition plate (302), the air inlet chamber (303) and the air outlet chamber (304) are communicated through the heat exchange pipeline (307), the heat exchange pipeline (307) is located in the medium cavity (306), the heat exchange pipeline (307) is further communicated with the exchange chamber (305), tail gas enters the heat exchange pipeline (307) through the air inlet chamber (303), reaches the exchange chamber (305) from the heat exchange pipeline (307), and is sent into the air outlet chamber (304) through the heat exchange pipeline (307).

6. The carbon dioxide compressor one / two stage compression control system of claim 5, wherein, The air inlet chamber (303) is communicated with the primary compression pipeline (5), the air outlet chamber (304) is communicated with the cooling pipeline (4), and the medium cavity (306) is provided with a medium input pipeline (15) for medium input and a medium output pipeline (14) for medium output.

7. The carbon dioxide compressor one / two stage compression control system of claim 5, wherein, The bottom of the exchange chamber (305) is communicated with a condensed water output pipeline (16).

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