CN209098535U - Carbon dioxide recovery and the system of utilizing in a kind of power-plant flue gas - Google Patents

Carbon dioxide recovery and the system of utilizing in a kind of power-plant flue gas Download PDF

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Publication number
CN209098535U
CN209098535U CN201821887940.7U CN201821887940U CN209098535U CN 209098535 U CN209098535 U CN 209098535U CN 201821887940 U CN201821887940 U CN 201821887940U CN 209098535 U CN209098535 U CN 209098535U
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gas
power
carbon dioxide
utilizing
plant flue
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CN201821887940.7U
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郭东方
汪世清
王金意
刘练波
郜时旺
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Huaneng Clean Energy Research Institute
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Huaneng Clean Energy Research Institute
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Abstract

Carbon dioxide recovery and the system of utilizing, including booster fan, the first absorption tower, solution reservoir, poor rich liquid heat exchanger, regenerator, condenser, gas-liquid separator, CO in a kind of power-plant flue gas provided by the utility model2Surge tank, methane gas generating device and methane purifying plant, by by the CO in power plant flue gas2It isolates and purifies, utilizes plasma method or catalysis method CO2Hydro-conversion is methane, realizes and abandons electric stored energy, by-product oxygen, CO2It traps integrated with chemical utilization；Solves the CO of power-plant flue gas carbon emission reduction2Problem of outlet；The CO mixed in methane gas is effectively realized simultaneously2The recycling and reusing of gas, and realize and carry out CO in same regenerator2Rich solution desorption；Realize that single column regenerates CO2Rich solution reduces investment operating cost.

Description

Carbon dioxide recovery and the system of utilizing in a kind of power-plant flue gas
Technical field
The utility model belongs to power-plant flue gas purification, carbon dioxide discharge-reduction technical field, and in particular to a kind of power-plant flue gas Middle carbon dioxide recovery and the system of utilizing.
Background technique
Carbon dioxide (CO2) it is the main greenhouse gas for leading to Global climate change, CO2Trapping, have become using with sealing up for safekeeping For one of the hot issue of international concern.China CO in 20172Total release is up to 93.3 hundred million tons, and wherein power industry is discharged Amount accounts for about 35%, is the primary discharge source of China's greenhouse gases.In addition, steel-making, cement, chemical industry (such as synthesis ammonia, hydrogen manufacturing, natural Gas purification) etc. industrial circles there is also a large amount of CO2Discharge.Coal-burning power plant, China CO at present2Recycling mainly by chemical absorbing and Alternating temperature regeneration method is by the CO in flue gas2Separation, then technical grade or food-class CO are obtained by means such as compression, liquefaction, purifications2 Product.But CO2Product market capacity is limited and added value of product is low, which fires China most at present using small Big coal-fired plant CO2Capturing device scale is only 120,000 tons/year.Therefore, the coal-burning power plant Yao Shixian CO2Extensive emission reduction is compeled to be essential Solve CO2High value added utilization problem.
CO2It is the final oxidation product of carbon and carbon compound, is widely present in nature, phosphorus content is existingization 10 times of stone fuel phosphorus content.As the fossil energies such as coal, petroleum gradually use up, CO2Main carbon source, and CO will be become2 Property is stablized, and is easy to transport and store, if can efficiently use, industrial prospect is very considerable.In addition, with the hair of social economy Exhibition, the non-carbon renewable energy accounting such as photovoltaic, wind-powered electricity generation and water power are significantly increased, but since what region matching and power grid dissolved asks Topic is faced with a large amount of abandoning light, abandonment, abandons the problems such as water, leads to the huge waste of resource.
10% of the per capita rate of China's natural gas less than the world at present, environment in recent years problem is increasingly prominent, natural gas Consumption proportion sustainable growth, China's natural gas external dependence degree have been approached 40%, and future will be more than 50%.If it is possible to By the CO in power-plant flue gas2Significant impact will be generated to China's future source of energy system and consumption structure by effectively recycling and utilizing, The extensive CO of power industry is helped to realize simultaneously2Emission reduction.
Summary of the invention
The technical problem to be solved by the utility model is to for the CO in above-mentioned power-plant flue gas in the prior art2? Less than effective use, carbon dioxide recovery is provided in a kind of power-plant flue gas and utilizes system；The utility model will be in power-plant flue gas CO2It effectively recycles and is converted into the chemical energy such as natural gas using non-carbon electric energy, realize the storage and transportation of energy high density, specifically will CO in flue gas2Simultaneously hydro-conversion methane is recycled, CO is realized2High value added utilization and non-carbon electric energy chemical conversion, expand product Outlet improves the economic benefit of power-plant flue gas decarburization technique, has a good application prospect.
The utility model uses following technical scheme:
Carbon dioxide recovery and the system of utilizing in a kind of power-plant flue gas provided by the utility model, including booster fan, the One absorption tower, solution reservoir, poor rich liquid heat exchanger, regenerator, condenser, gas-liquid separator, CO2Surge tank and methane gas hair Generating apparatus, wherein pass through booster fan between the gas feed of the first absorption tower lower part and the lower end gas vent of chimney of electric plant It connects, the gas vent at the top of the first absorption tower is connected with the gas feed of chimney of electric plant upper end；Lean solution on first absorption tower Absorbent solution in import and liquid storage tank, which exports, to be connected；The CO of first absorb the bottom of the tower2Rich solution outlet exchanges heat by rich or poor liquid Device is connected with the rich solution import on regenerator top, regenerate tower bottom hot lean solution outlet with poor rich liquid heat exchanger on hot lean solution into Mouth connection；Gas vent at the top of regenerator successively passes through condenser and gas-liquid separator and CO2Surge tank connection, CO2Surge tank CO2Gas vent is connect with methane gas generating device.
Preferably, methane gas generating device is reactor, wherein CO2The CO of surge tank2Gas vent connects reactor CO2Gas feed, meanwhile, the hydrogen inlet connection Hydrogen Line being arranged on reactor.
Preferably, methane gas generating device and CO2Gas mixer is provided between surge tank, wherein gas mixing The upper end import of device connects CO2The CO of surge tank2Gas vent；Gas mixer bottom inlet connects Hydrogen Line；Gas mixing The entrance of the mixed gas outlet connection methane gas generating device of device.
Preferably, the entrance connection of Hydrogen Line is used to prepare the hydrogen outlet of the electrolysis unit of hydrogen.
Preferably, gas mixer and CO2CO is provided between surge tank2Gas purifying device.
Preferably, methane gas generating device and CO2CO is provided between surge tank2Gas purifying device.
Preferably, CO2Gas purifying device includes molecular sieve tower and purifying column, wherein CO2CO on surge tank2Gas goes out Mouth is successively connect with molecular sieve tower and purifying column by compressor, the hydrogen on the gas vent connection gas mixer of purifying column Hydrogen inlet on entrance or methane gas generating device.
Preferably, the first solution pump is provided between solution reservoir and the first absorption tower.
Preferably, the first rich solution pump is provided between the first absorption tower and poor rich liquid heat exchanger.
Compared with prior art, the utility model at least has the advantages that
Carbon dioxide recovery and the system of utilizing in a kind of power-plant flue gas provided by the utility model, by by power plant flue gas In CO2It isolates and purifies, utilizes plasma method or catalysis method CO2Hydro-conversion is methane, realizes and abandons electric stored energy, by-product Oxygen, CO2It traps integrated with chemical utilization；Solves the CO of power-plant flue gas carbon emission reduction2Problem of outlet.
Further, the utility model using organically with power-plant flue gas CO2Absorption and regeneration device combines, and effectively real The CO mixed in methane gas is showed2The recycling and reusing of gas, and realize and carry out CO in same regenerator2Rich solution desorption； Realize that single column regenerates CO2Rich solution reduces investment operating cost.
Below by drawings and examples, the technical solution of the utility model is described in further detail.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model；
Wherein: 1, booster fan 2, the first absorption tower 3, the first rich solution pump 4, poor rich liquid heat exchanger 5, regenerator 6, Condenser 7, gas-liquid separator 8, CO2Surge tank 9, compressor 10, molecular sieve tower 11, purifying column 12, gas mixer 13, reactor 14, second absorption tower 15, the second rich solution pump 16, lean pump 17, solution reservoir 18, the first solution pump 19, Second solution pump 20, electrolysis unit.
Specific embodiment
In the description of the present invention, it should be understood that term " center ", " longitudinal direction ", " transverse direction ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside", " side ", " one end ", " one side " etc. The orientation or positional relationship of instruction is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of description the utility model It is described with simplifying, rather than the device or element of indication or suggestion meaning must have a particular orientation, with specific orientation structure It makes and operates, therefore should not be understood as limiting the present invention.In addition, term " first ", " second " are only used for description mesh , it is not understood to indicate or imply relative importance or implicitly indicates the quantity of indicated technical characteristic.It limits as a result, There is the feature of " first ", " second " to can explicitly or implicitly include one or more of the features surely.It is practical new at this In the description of type, unless otherwise indicated, the meaning of " plurality " is two or more.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " is pacified Dress ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally Connection；It can be mechanical connection, be also possible to be electrically connected；Can be directly connected, can also indirectly connected through an intermediary, It can be the connection inside two elements.For the ordinary skill in the art, above-mentioned art can be understood with concrete condition The concrete meaning of language in the present invention.
As shown in Figure 1, carbon dioxide recovery and the system of utilizing in a kind of power-plant flue gas provided by the utility model, including increase Pressure fan 1, the first absorption tower 2, the first rich solution pump 3, poor rich liquid heat exchanger 4, regenerator 5, condenser 6, gas-liquid separator 7, CO2 Surge tank 8, compressor 9, molecular sieve tower 10, purifying column 11, gas mixer 12, reactor 13, second absorption tower 14, second are rich Liquid pump 15, lean pump 16, solution reservoir 17, the first solution pump 18, the second solution pump 19 and electrolysis unit 20, wherein pressurization wind The import of machine 1 is connected with chimney of electric plant, and the outlet of booster fan 1 is connected with the gas feed of 2 lower part of the first absorption tower；First inhales The gas vent for receiving 2 top of tower is connected with chimney of electric plant, the CO of 2 bottom of the first absorption tower2Rich solution outlet passes sequentially through rich solution pump 3, poor rich liquid heat exchanger 4 is connected with the rich solution import on 5 top of regenerator；The regeneration gas outlet at 5 top of regenerator passes through condenser 6 It is connected with the gas feed of gas-liquid separator 7；The condensation reflux liquid outlet of 7 bottom of gas-liquid separator and returning for 5 top of regenerator Flow liquid import is connected, and the gas vent on 7 top of gas-liquid separator passes sequentially through CO2Surge tank 8, compressor 9, molecular sieve tower 10, The CO of purifying column 11 and gas mixer 122Gas feed is connected；The gas vent of gas mixer 12 and the gas of reactor 13 Body import is connected；The gas vent of reactor 13 is connected with the gas feed of 14 lower part of second absorption tower；14 bottom of second absorption tower The CO in portion2Rich solution outlet passes sequentially through rich solution pump 15, poor rich liquid heat exchanger 4 is connected with the rich solution import on 5 top of regenerator；Regeneration The lean solution outlet of 5 bottom of tower passes sequentially through lean pump 16, poor rich liquid heat exchanger 4 is connected with the solution inlet port of solution reservoir 17；It is molten The taphole of 17 bottom of liquid storage tank pass through respectively solution pump 18, solution pump 19 and absorption tower 2, second absorption tower 14 lean solution into Mouth is connected；The hydrogen outlet of electrolysis unit 20 is connected with the hydrogen inlet of gas mixer 12.
The working principle of the utility model is as follows:
Contain CO2Power plant flue gas by booster fan 1 from chimney extract out, via the gas feed of 2 lower part of absorption tower It inputs in absorption tower 2, the absorbent solution at the same time from solution reservoir 17 is pumped into the lean solution on 2 top of absorption tower by solution pump 18 Import, CO2The full regression in tower contacts and is absorbed agent absorption gas with absorbent.It is absorbed agent removing CO2Gas afterwards after It is continuous to flow up, it is discharged with after foam removal by the gas vent at 2 top of absorption tower by washing, returns to chimney of electric plant.
Absorb CO2Rich solution afterwards is sent to poor rich liquid heat exchanger 4 in 2 bottom of absorption tower by rich solution pump 3, and comes from regenerator Enter regenerator 5 after the hot lean solution heat exchange heating of 5 bottoms and carries out thermal desorption.CO containing part vapor, absorbent steam2Again Anger is flowed out by the gas vent at 5 top of regenerator, becomes high concentration CO after the cooling of subcooler 6 and knockout drum 72Gas Body, high concentration CO2Gas enters CO2Surge tank 8, condensate liquid return to regenerator 5.
CO2CO in surge tank 82After gas is boosted by compressor 9, further removed into molecular sieve tower 10, purifying column 11 High-purity CO is obtained after the foreign gases such as steam, fixed gas2Product gas, it is logical with the high-purity hydrogen from electrolysis unit 20 later It crosses after gas mixer 12 is sufficiently mixed and enters the sufficiently reaction generation methane gas of reactor 13, contain plasma in reactor 13 Body generating device or catalyst bed keep CO in reaction process2Gas is excessive to guarantee that hydrogen sufficiently reacts.It is mixed after reaction Gas is closed mainly by methane and unreacted CO2Composition enters second absorption tower 14 after being discharged via the gas vent of reactor 13, Absorbent solution at the same time from solution reservoir 17 is pumped into the lean solution import on 14 top of second absorption tower by solution pump 19, removing CO2Methane gas afterwards is exported by 14 top gas of second absorption tower and is discharged, and absorbs CO2Rich solution afterwards is at 14 bottom of second absorption tower Portion is sent by rich solution pump 15 to poor rich liquid heat exchanger 4, enters regenerator with after the heat exchange heating of the hot lean solution of 5 bottom of regenerator 5 carry out thermal desorption.5 bottom of regenerator removes CO2Lean solution afterwards is drawn by lean pump 16, is exchanged heat by rich or poor heat exchanger 4 laggard Enter solution reservoir 17 and is recycled.
The above content is only to illustrate the technical idea of the utility model, and the protection model of the utility model cannot be limited with this Enclose, it is all according to the utility model proposes technical idea, any changes made on the basis of the technical scheme each falls within this reality Within protection scope with novel claims.

Claims (9)

1. carbon dioxide recovery and the system of utilizing in a kind of power-plant flue gas, which is characterized in that inhaled including booster fan (1), first Receive tower (2), solution reservoir (17), poor rich liquid heat exchanger (4), regenerator (5), condenser (6), gas-liquid separator (7), CO2It is slow Rush tank (8) and methane gas generating device, wherein the gas feed of the first absorption tower (2) lower part and the lower end gas of chimney of electric plant Body is connected between outlet by booster fan (1), the gas of gas vent and chimney of electric plant upper end at the top of the first absorption tower (2) Import is connected；The absorbent solution in lean solution import and liquid storage tank (17) on first absorption tower (2), which exports, to be connected；First absorbs The CO of tower (2) bottom2Rich solution outlet is connected by poor rich liquid heat exchanger (4) with the rich solution import on regenerator (5) top, regenerator (5) the hot lean solution outlet of bottom is connect with the hot lean solution import on poor rich liquid heat exchanger (4)；Gas at the top of regenerator (5) goes out Mouth is successively by condenser (6) and gas-liquid separator (7) and CO2Surge tank (8) connection, CO2The CO of surge tank (8)2Gas vent It is connect with methane gas generating device.
2. carbon dioxide recovery and the system of utilizing in a kind of power-plant flue gas according to claim 1, which is characterized in that methane Gas generating unit is reactor (13), wherein CO2The CO of surge tank (8)2Gas vent connects the CO of reactor (13)2Gas Import, meanwhile, the hydrogen inlet connection Hydrogen Line being arranged on reactor (13).
3. carbon dioxide recovery and the system of utilizing in a kind of power-plant flue gas according to claim 1, which is characterized in that methane Gas generating unit and CO2Gas mixer (12) are provided between surge tank (8), wherein the upper end of gas mixer (12) Import connects CO2The CO of surge tank (8)2Gas vent；Gas mixer (12) bottom inlet connects Hydrogen Line；Gas mixing The entrance of the mixed gas outlet connection methane gas generating device of device (12).
4. carbon dioxide recovery and the system of utilizing in a kind of power-plant flue gas according to claim 2 or 3, which is characterized in that The entrance connection of Hydrogen Line is used to prepare the hydrogen outlet of the electrolysis unit (20) of hydrogen.
5. carbon dioxide recovery and the system of utilizing in a kind of power-plant flue gas according to claim 3, which is characterized in that gas Mixer (12) and CO2Surge tank is provided with CO between (8)2Gas purifying device.
6. carbon dioxide recovery and the system of utilizing in a kind of power-plant flue gas according to claim 1, which is characterized in that methane Gas generating unit and CO2Surge tank is provided with CO between (8)2Gas purifying device.
7. carbon dioxide recovery and the system of utilizing in a kind of power-plant flue gas according to claim 5 or 6, which is characterized in that CO2Gas purifying device includes molecular sieve tower (10) and purifying column (11), wherein CO2CO on surge tank (8)2Gas vent is logical Overcompression machine (9) is successively connect with molecular sieve tower (10) and purifying column (11), and the gas vent connection gas of purifying column (11) is mixed The hydrogen inlet on hydrogen inlet or methane gas generating device in clutch (12).
8. carbon dioxide recovery and the system of utilizing in a kind of power-plant flue gas according to claim 1, which is characterized in that solution The first solution pump (18) are provided between storage tank (17) and the first absorption tower (2).
9. carbon dioxide recovery and the system of utilizing in a kind of power-plant flue gas according to claim 1, which is characterized in that first The first rich solution pump (3) are provided between absorption tower (2) and poor rich liquid heat exchanger (4).
CN201821887940.7U 2018-11-15 2018-11-15 Carbon dioxide recovery and the system of utilizing in a kind of power-plant flue gas Active CN209098535U (en)

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