CN209857513U - Fossil fuel tail gas carbon dioxide separation and purification system - Google Patents
Fossil fuel tail gas carbon dioxide separation and purification system Download PDFInfo
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- CN209857513U CN209857513U CN201920614892.2U CN201920614892U CN209857513U CN 209857513 U CN209857513 U CN 209857513U CN 201920614892 U CN201920614892 U CN 201920614892U CN 209857513 U CN209857513 U CN 209857513U
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Abstract
The utility model discloses a fossil fuel tail gas carbon dioxide separation and purification system, including CO2A separation and purification subsystem; the subsystem comprises a filter unit, a first gas compressor, an evaporative condenser, and a condenser2O gas-liquid separator, dry filter, evaporator, and CO2A gas-liquid separator; filter device, first gas compressor, evaporative condenser and H2O gas-liquid separator, dry filter, evaporator and CO2The gas-liquid separators are communicated in sequence in a one-way mode. The utility model discloses a fossil fuel tail gas carbon dioxide separation purification system to fossil fuel tail gas pressurization processing of cooling down, CO that contains in the separation purification tail gas2Gas, make CO2Gas (es)Liquefying and then on liquefied CO2Collecting and utilizing; and the N in the tail gas is removed2And collecting and utilizing the gas. The system effectively separates, purifies and utilizes CO in the fossil fuel tail gas2Gas, which produces great environmental and economic value.
Description
Technical Field
The utility model relates to a refrigeration technology, CO2Separation and purification combine together technical field, concretely relates to fossil fuel tail gas carbon dioxide separation and purification system.
Background
With the combustion and utilization of a large amount of fossil fuels, tail gas generated after the combustion of the fossil fuels is subjected to a series of treatments such as dust removal, desulfurization, denitration, denitrification and the like, and is discharged after reaching the environmental protection standard, so that the harm of industrial waste gas pollutants to the environment is reduced to a certain extent. However, the fossil fuel exhaust gas discharged to the atmosphere contains a large amount of CO2Gas and N2Gas of which CO2The emission of a large amount of gas easily causes global warming, forms greenhouse effect and damages the ecological environment of the earth.
But on the other hand, CO2Is a very useful resource, CO2The application is extremely wide: (1) oil mining industry, injecting one ton of CO down an oil well2The yield of crude oil can be increased by 3-5 tons through the liquid; (2) machine foundry, CO2Is an additive; (3) metal smelting industry, especially high-quality steel, stainless steel, non-ferrous metal, CO2Is a quality stabilizer; (4) ceramic porcelain industry, CO2Is a fixative; (5) biopharmaceutical, indissoluble CO2(ii) a (6) Beverage beer industry, CO2Is an additive for promoting digestion and stimulating appetite; (7) making yeast mother powder, CO2Is an agonist; (8) fire-fighting industry, CO2Is a fire extinguishing agent; (9) making dry ice more indiscernible from CO2(ii) a (10) The urea fertilizer being CO2And ammonia gas; (11) all green plants are exposed to light, CO2Is a main raw material. In addition, people's daily clothes, food, live and walk are also from CO2The products of (a) and the like.
Therefore, the CO in the fossil fuel tail gas is effectively separated, purified and utilized2Not only meets the requirements of low carbon, environmental protection, energy conservation and emission reduction, reduces carbon emission and conforms to the world development trendBut also can generate huge environmental protection value and economic value, and has important strategic significance for national and social development.
In the prior art, there are many COs2Separation and purification techniques, but using CO2Critical temperature of (2) for CO in fossil fuel tail gas2The separation and purification technology is not many.
Disclosure of Invention
To the defects of the prior art, the utility model provides a fossil fuel tail gas carbon dioxide separation and purification system, nevertheless utilize CO2Critical temperature of (2) for CO in fossil fuel tail gas2The separation and purification are carried out, so that the low carbon and environmental protection are better realized, the energy is saved, the emission is reduced, and the CO in the fossil fuel tail gas is improved2The effective utilization rate and great environmental protection value and economic value are generated.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a system for separating and purifying carbon dioxide from a fossil fuel tail gas at least comprises a CO2A separation and purification subsystem; the CO is2The separation and purification subsystem comprises a filtering device for removing dust, desulfurizing, denitrifying and denitrifying from the fossil fuel tail gas and forming a clean fossil fuel tail gas, a first gas compressor for compressing the clean fossil fuel tail gas and forming a high-pressure clean fossil fuel tail gas, and a precooling and cooling system for precooling and cooling the high-pressure clean fossil fuel tail gas and enabling H in the high-pressure clean fossil fuel tail gas to be clean20 gas is condensed into liquid water by the evaporative condenser, the liquid water in the high-pressure clean fossil fuel tail gas is separated, and H of the high-pressure clean fossil fuel tail gas containing a small amount of water is formed2O gas-liquid separator for drying the high-pressure clean fossil fuel tail gas containing a small amount of water to form a dry filter for drying the high-pressure clean fossil fuel tail gas, and performing heat exchange treatment to remove CO from the dry high-pressure clean fossil fuel tail gas2Evaporator for liquefaction, CO2CO separation from liquid and low temperature high pressure dried clean fossil fuel tail gas2A gas-liquid separator; the filtering device, the first gas compressor, the evaporative condenser and the H2O gas-liquid separator, dry filter, evaporationDevice, CO2The gas-liquid separators are communicated in sequence in a one-way mode.
As an improvement to the above solution, the CO is2The liquid outlet of the gas-liquid separator is connected with CO2Liquid storage tank, the CO2And a gas outlet of the gas-liquid separator is connected with a second gas compressor, and a compressed gas outlet of the second gas compressor is connected with a gas storage tank.
As an improvement to the technical scheme, the fossil fuel tail gas carbon dioxide separation and purification system further comprises a refrigeration and cooling circulation subsystem, wherein the refrigeration and cooling circulation subsystem comprises a refrigeration compressor, a heat exchanger, a throttling device and a CO pipeline, the refrigeration compressor, the heat exchanger and the throttling device are connected in a closed loop mode, and the refrigeration compressor, the heat exchanger and the throttling device are connected with the CO pipeline2The separation and purification subsystem shares a bridged evaporator, the refrigeration compressor compresses high-temperature and high-pressure refrigerant ammonia vapor to exchange heat in the heat exchanger and condense the high-temperature and high-pressure refrigerant ammonia vapor into high-temperature and high-pressure refrigerant ammonia liquid, the high-temperature and high-pressure refrigerant ammonia liquid is throttled and reduced into low-temperature and low-pressure refrigerant ammonia liquid in the throttling device, the low-temperature and low-pressure refrigerant ammonia liquid evaporates and absorbs heat in the evaporator, meanwhile, the dry high-pressure clean fossil fuel tail gas entering the evaporator is cooled, the low-temperature and low-pressure refrigerant ammonia liquid formed after the evaporator evaporates and absorbs heat enters the refrigeration compressor and is compressed into high-temperature and high-pressure refrigerant ammonia vapor, and a refrigeration cycle.
As an improvement to the above technical scheme, an oil collector is arranged between the refrigeration compressor and the heat exchanger; the high-temperature high-pressure refrigerant ammonia vapor compressed in the refrigeration compressor enters an oil collector, lubricating oil drops carried in the high-temperature high-pressure refrigerant ammonia vapor are separated and collected by the oil collector to form oil-free high-temperature high-pressure refrigerant ammonia vapor, and then the oil-free high-temperature high-pressure refrigerant ammonia vapor enters the heat exchanger.
As an improvement to the above technical solution, between the filtering device and the first gas compressor, between the second gas compressor and the gas storage tank, between the second gas compressor and CO2Between the liquid storage tanks and the CO2Between the gas-liquid separator and the second gas compressor, between the refrigeration compressor and the gas communication port of the oil collector, between the oil outlet of the oil collector and the refrigeration compressor, and between the oil outlet of the oil collector and the second gas compressor2Liquid of O gas-liquid separatorA stop valve is arranged at the liquid outlet.
As an improvement to the above technical solution, the heat exchanger is a plate heat exchanger but is not limited to a plate heat exchanger.
Compared with the prior art, the utility model discloses the beneficial effect who gains is:
the utility model discloses a fossil fuel tail gas carbon dioxide separation purification system to fossil fuel tail gas pressurization processing of cooling down, CO that contains in the separation purification tail gas2Gas, make CO2Liquefying the gas and then liquefying the liquefied CO2Collecting and utilizing; and passing through the fossil fuel tail gas CO2N in tail gas treated by separation and purification system2The gas concentration is increased and can be collected and utilized as N2Gas separation of the purified raw material. The system effectively separates, purifies and utilizes CO in the fossil fuel tail gas2Gas, make CO2Liquefying the gas and then liquefying the liquefied CO2The collection and utilization are carried out, and huge environmental protection value and economic value are generated.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic diagram of the system of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, any modifications, equivalent replacements, improvements, etc. made by other embodiments obtained by a person of ordinary skill in the art without creative efforts shall be included in the protection scope of the present invention.
Carbon dioxide, a chemical combination of two oxygen atoms and one carbon atom, the symbol CO2. Carbon dioxide is generally a gas that can be condensed into a liquid at low temperatures and high pressures. It is tasteless, colorless, nontoxic, and invisible. Critical temperature, which refers to the lowest temperature at which the gas liquefies, above which it cannot be liquefied by any pressurization; the critical pressure refers to the saturated vapor pressure of the liquid at the critical temperature, i.e., the minimum pressure required to liquefy the gas at the critical temperature. CO 22The critical temperature of (A) is 31.1 ℃, CO2The critical pressure was 7.372 MPa.
The fossil fuel tail gas CO2The separation and purification system comprises a refrigeration and cooling circulation subsystem and CO2And a separation and purification subsystem. The main equipment in the refrigeration cooling circulation subsystem comprises: the system comprises a refrigeration compressor, an oil separator, a plate heat exchanger, a throttling device and an evaporator; CO 22The main equipment in the separation and purification subsystem comprises: chimney, filter device, first gas compressor, evaporative condenser and H2O gas-liquid separator, dry filter, and CO2Gas-liquid separator, second gas compressor, gas storage tank and CO2A liquid storage tank. Refrigeration cooling circulation subsystem and CO2The main devices in the separation and purification subsystem are respectively connected through a specific pipeline and a valve; refrigeration cooling circulation subsystem and CO2The separation and purification subsystems are connected through an evaporator. The refrigerant in the refrigeration cooling circulation subsystem adopts ammonia.
Fig. 1 is a schematic diagram of the system of the present invention. As shown in fig. 1: CO 22The separation and purification subsystem comprises: starting the process; the refrigeration cooling circulation subsystem is as follows: .
In practical application, CO2The fossil fuel tail gas in the separation and purification subsystem is discharged from a chimney A and enters a filter device B through a pipeline 1, and the filter device B is further subjected to dust removal, desulfurization, denitrification and denitration to form CO as a main component2Gas, N2Gas, H2Clean fossil fuel tail gas of O gas; then, cleaningThe clean fossil fuel tail gas sequentially passes through a stop valve F1 and a pipeline 2, enters a first gas compressor C1, is subjected to primary compression in a first gas compressor C1, and the pressure is raised to 3MPa, so that high-pressure clean fossil fuel tail gas is formed; the high-pressure clean fossil fuel tail gas enters an evaporative condenser D through a pipeline 3 for precooling and cooling to ensure that H in the high-pressure clean fossil fuel tail gas20 gas is condensed into liquid water and then enters H through the pipeline 42O, a gas-liquid separator E for separating liquid water in the high-pressure clean fossil fuel tail gas to form the high-pressure clean fossil fuel tail gas containing a small amount of water; at H2Liquid water separated from the O gas-liquid separator E sequentially passes through a stop valve F2 and a pipeline 6 and is discharged outwards; at H2And the high-pressure clean fossil fuel tail gas containing a small amount of water and formed in the O gas-liquid separator E enters a drying filter G through a pipeline 5 and is dried to form dry high-pressure clean fossil fuel tail gas.
The utility model discloses a gas compressor pressurizes fossil fuel tail gas to combine evaporative condenser, carry out the precooling to clean fossil fuel tail gas and cool down the processing, for later secondary cooling handles and makes preparation, have easy and simple to handle, energy-conserving efficient advantage.
In practical application, low-temperature and low-pressure refrigerant ammonia vapor in the refrigeration cooling circulation subsystem enters a refrigeration compressor I through a pipeline 15 and is compressed into high-temperature and high-pressure refrigerant ammonia vapor in the refrigeration compressor I; the high-temperature high-pressure refrigerant ammonia vapor enters an oil collector K through a pipeline 12, and lubricating oil drops carried in the high-temperature high-pressure refrigerant ammonia vapor are separated and collected; lubricating oil drops separated from the oil collector K sequentially pass through a stop valve F6/a stop valve F7 and a pipeline 14 and enter a refrigeration compressor I, and high-temperature and high-pressure refrigerant ammonia vapor separated from the oil collector K sequentially passes through a pipeline 13 and a plate heat exchanger N, exchanges heat in the plate heat exchanger N and is condensed into high-temperature and high-pressure refrigerant ammonia liquid; the high-temperature high-pressure refrigerant ammonia liquid passes through the pipeline 17 and the throttling device O in sequence, and is throttled and decompressed into low-temperature low-pressure refrigerant ammonia liquid; the low-temperature low-pressure refrigerant ammonia liquid enters the evaporator J through the pipeline 16, evaporates and absorbs heat, and carries out secondary cooling treatment on the dry high-pressure clean fossil fuel tail gas entering the evaporator J in the refrigeration cooling circulation subsystem; the low-temperature low-pressure refrigerant ammonia liquid in the evaporator J evaporates and absorbs heat to become low-temperature low-pressure refrigerant ammonia vapor; the low-temperature low-pressure refrigerant ammonia vapor enters the refrigeration compressor I through the pipeline 15 and is compressed into high-temperature high-pressure refrigerant ammonia vapor, and a refrigeration cycle is completed.
The utility model discloses a steam compression formula refrigeration carries out the secondary cooling to the clean fossil fuel tail gas of dry high pressure through evaporative condenser precooling treatment, forms CO2The liquid and the clean fossil fuel tail gas dried at low temperature and high pressure have the advantages of simple operation, energy conservation, high efficiency, cost saving, and convenient separation and purification of CO2The advantages of (1).
In practical application, the high-pressure clean fossil fuel tail gas dried in the drying filter G enters an evaporator J in the refrigeration and cooling circulation subsystem through a pipeline 7 to be subjected to secondary cooling treatment; the evaporation temperature of an evaporator J in the refrigeration cooling circulation subsystem is set to be-20 ℃ and is far lower than CO2The zero boundary temperature of the gas is 31.1 ℃; the dry high-pressure clean fossil fuel tail gas is cooled for the second time in the evaporator J to form CO2Liquid and low temperature high pressure dried clean fossil fuel tail gas; CO 22Liquid and low-temperature high-pressure dried clean fossil fuel tail gas enters CO through a pipeline 82Gas-liquid separator H for separating CO2Separating liquid from the clean fossil fuel tail gas which is dried at low temperature and high pressure; separation of CO2The liquid enters into CO through the pipeline 11 and the stop valve F4 in sequence2A liquid storage tank M for storage; the separated clean fossil fuel tail gas dried at low temperature and high pressure is characterized in that the tail gas contains high-concentration N2The separated clean fossil fuel with low temperature and high pressure enters the tail gas into a second gas compressor C2 through a stop valve F5 and a pipeline 9 in sequence for secondary compression, and then enters a gas storage tank L through a pipeline 10 and a stop valve F3 for storage, and the tail gas is used for preparing N2Raw material of gas.
The utility model adopts CO2A gas-liquid separator for pressurizing and cooling the CO generated from the dried high-pressure clean fossil fuel tail gas2Liquid and low temperature high pressure dried clean fossil fuelSeparating tail gas to obtain purified CO2Liquids and compositions containing high concentrations of N2The clean fossil fuel tail gas dried at low temperature and high pressure has the advantages of simple and convenient operation, operation cost saving and economic benefit improvement.
In practical application, the adopted pipelines have good temperature resistance, pressure resistance and corrosion resistance to refrigerant ammonia.
While the preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the appended claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the scope of the invention.
Claims (6)
1. A fossil fuel tail gas carbon dioxide separation purification system which characterized in that: the carbon dioxide separation and purification system for the fossil fuel tail gas at least comprises one CO2A separation and purification subsystem; the CO is2The separation and purification subsystem comprises a filtering device for removing dust, desulfurizing, denitrifying and denitrifying from the fossil fuel tail gas and forming a clean fossil fuel tail gas, a first gas compressor for compressing the clean fossil fuel tail gas and forming a high-pressure clean fossil fuel tail gas, and a precooling and cooling system for precooling and cooling the high-pressure clean fossil fuel tail gas and enabling H in the high-pressure clean fossil fuel tail gas to be clean20 gas is condensed into liquid water by the evaporative condenser, the liquid water in the high-pressure clean fossil fuel tail gas is separated, and H of the high-pressure clean fossil fuel tail gas containing a small amount of water is formed2O gas-liquid separator for drying the high-pressure clean fossil fuel tail gas containing a small amount of water to form a dry filter for drying the high-pressure clean fossil fuel tail gas, and performing heat exchange treatment to remove CO from the dry high-pressure clean fossil fuel tail gas2Evaporator for liquefaction, CO2CO separation from liquid and low temperature high pressure dried clean fossil fuel tail gas2A gas-liquid separator; the filtering device, the first gas compressor, the evaporative condenser and the H2O gas-liquid separator, dry filter, evaporator and CO2The gas-liquid separator forms a one-way valveAnd (5) secondary communication.
2. The system for separating and purifying carbon dioxide from a fossil fuel tail gas as claimed in claim 1, wherein: the CO is2The liquid outlet of the gas-liquid separator is connected with CO2Liquid storage tank, the CO2And a gas outlet of the gas-liquid separator is connected with a second gas compressor, and a compressed gas outlet of the second gas compressor is connected with a gas storage tank.
3. The system for separating and purifying carbon dioxide from a fossil fuel tail gas as claimed in claim 2, wherein: the fossil fuel tail gas carbon dioxide separation and purification system further comprises a refrigeration and cooling circulation subsystem, wherein the refrigeration and cooling circulation subsystem comprises a refrigeration compressor, a heat exchanger, a throttling device and CO, wherein the refrigeration compressor, the heat exchanger and the throttling device are connected in a closed loop mode2The separation and purification subsystem shares a bridged evaporator, the refrigeration compressor compresses high-temperature and high-pressure refrigerant ammonia vapor to exchange heat in the heat exchanger and condense the high-temperature and high-pressure refrigerant ammonia vapor into high-temperature and high-pressure refrigerant ammonia liquid, the high-temperature and high-pressure refrigerant ammonia liquid is throttled and reduced into low-temperature and low-pressure refrigerant ammonia liquid in the throttling device, the low-temperature and low-pressure refrigerant ammonia liquid evaporates and absorbs heat in the evaporator, meanwhile, the dry high-pressure clean fossil fuel tail gas entering the evaporator is cooled, the low-temperature and low-pressure refrigerant ammonia liquid formed after the evaporator evaporates and absorbs heat enters the refrigeration compressor and is compressed into high-temperature and high-pressure refrigerant ammonia vapor, and a refrigeration cycle.
4. The system for separating and purifying carbon dioxide from a fossil fuel tail gas as claimed in claim 3, wherein: an oil collector is arranged between the refrigeration compressor and the heat exchanger; the high-temperature high-pressure refrigerant ammonia vapor compressed in the refrigeration compressor enters an oil collector, lubricating oil drops carried in the high-temperature high-pressure refrigerant ammonia vapor are separated and collected by the oil collector to form oil-free high-temperature high-pressure refrigerant ammonia vapor, and then the oil-free high-temperature high-pressure refrigerant ammonia vapor enters the heat exchanger.
5. The system for separating and purifying carbon dioxide in fossil fuel tail gas according to claim 4The system is characterized in that: between the filtering device and the first gas compressor, between the second gas compressor and the gas storage tank, between the second gas compressor and CO2Between the liquid storage tanks and the CO2Between the gas-liquid separator and the second gas compressor, between the refrigeration compressor and the gas communication port of the oil collector, between the oil outlet of the oil collector and the refrigeration compressor, and between the oil outlet of the oil collector and the second gas compressor2And a liquid-liquid outlet of the O gas-liquid separator is provided with a stop valve.
6. The system for separating and purifying carbon dioxide from a fossil fuel tail gas as claimed in claim 4, wherein: the heat exchanger is a plate heat exchanger but is not limited to a plate heat exchanger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920614892.2U CN209857513U (en) | 2019-04-30 | 2019-04-30 | Fossil fuel tail gas carbon dioxide separation and purification system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920614892.2U CN209857513U (en) | 2019-04-30 | 2019-04-30 | Fossil fuel tail gas carbon dioxide separation and purification system |
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| Publication Number | Publication Date |
|---|---|
| CN209857513U true CN209857513U (en) | 2019-12-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920614892.2U Expired - Fee Related CN209857513U (en) | 2019-04-30 | 2019-04-30 | Fossil fuel tail gas carbon dioxide separation and purification system |
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| CN (1) | CN209857513U (en) |
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- 2019-04-30 CN CN201920614892.2U patent/CN209857513U/en not_active Expired - Fee Related
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Granted publication date: 20191227 Termination date: 20210430 |