CN113477035A - Carbon dioxide absorption method and absorption system - Google Patents
Carbon dioxide absorption method and absorption system Download PDFInfo
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- CN113477035A CN113477035A CN202110804485.XA CN202110804485A CN113477035A CN 113477035 A CN113477035 A CN 113477035A CN 202110804485 A CN202110804485 A CN 202110804485A CN 113477035 A CN113477035 A CN 113477035A
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Abstract
The invention discloses a method and a system for absorbing carbon dioxide. The apparatus comprises an absorption tank; the bottom of the absorption box is provided with a liquid recovery tank and a liquid outlet pipe, and the liquid outlet pipe is provided with a first valve; a T-shaped first liquid spraying pipe is arranged at the top of the absorption box, and a first rotating motor is arranged above the absorption box; the top end of the first liquid spraying pipe extends into the first sleeve, and the other end of the first sleeve is fixedly connected with the first liquid inlet pipe; a T-shaped second liquid spraying pipe is arranged above the liquid recovery tank; the lower part of the second liquid spraying pipe is fixedly connected with a second rotating motor; the tail end of the second liquid spraying pipe extends into the second sleeve, and the other end of the second sleeve is fixedly connected with the second liquid inlet pipe; a plurality of air inlet pipes are arranged on the side wall of the absorption box; the top of the absorption box is provided with a plurality of air outlets. The system of the invention uses the hyperbranched polyamine carbon dioxide absorbent to absorb carbon dioxide, can also obtain carbon-rich fluid, and can be used for improving the oil recovery rate, improving the absorption rate of reducing carbon dioxide and lowering the absorption cost after being recovered.
Description
Technical Field
The invention relates to the technical field of CCUS, in particular to a method and a system for absorbing carbon dioxide by a hyperbranched polyamine carbon dioxide absorbent.
Background
The emission of carbon dioxide in China is increased dramatically from 2001, and the emission of carbon dioxide exceeds the United states for the first time in 2005, so that the emission of carbon dioxide is the most global country, and the emission of carbon dioxide reaches 100 hundred million tons in 2018. Development of CO, which is fundamentally characterized by a reduction in the carbon content of the atmosphere, by capturing, sequestering and actively utilizing the carbon element emitted2The trapping, utilization and sequestration technology (CCUS) of (A) is the most ideal situation to achieve zero carbon emission. Currently, CO capture from various mixed gases2The method mainly comprises a chemical absorption method, a pressure swing adsorption method, a membrane treatment method and a low-temperature fractionation method, wherein the chemical absorption method is most mature in application, and the other methods are mainly in a real/experimental stage. Due to CO2The method has the problems of large consumption of the trapped and regenerated steam, high regeneration energy consumption, strong corrosivity of high-temperature solution, easy degradation of the solution, large solvent loss, high equipment investment cost, large trapping equipment, low cycle efficiency, reduction of the power generation efficiency of a power plant and the like. Conventional CO2The trapping process is carried out by using absorbent and CO2Reacting to convert gaseous CO2Is converted into a solution state and then passes through a high temperature (>The carbon dioxide is decomposed and resolved at 120 ℃, purified and compressed, and then stored and transported outside for sealing, and the carbon dioxide capturing and sealing technology (CCS) has higher cost. A hyperbranched polyamine carbon dioxide absorbent is a novel carbon dioxide absorbent, carbon dioxide is absorbed and then reacts to generate carbon-rich fluid, and the carbon-rich fluid can be used as an oil displacement agent to improve the recovery ratio of petroleum. Therefore, the carbon dioxide can be sealed in the oil and gas field, the recovery ratio of petroleum can be improved, the cost of a carbon dioxide capture and sealing technology (CCS) is reduced, and multiple purposes are achieved. Therefore, there is a need for a method and an apparatus for absorbing carbon dioxide by a hyperbranched polyamine carbon dioxide absorbent, which can improve the absorption rate of carbon dioxide and can recover carbon-rich fluid for oil recovery.
Disclosure of Invention
In view of the above prior art, the present invention provides a method and an absorption system for absorbing carbon dioxide by using a hyperbranched polyamine carbon dioxide absorbent. The system can improve the absorption rate of carbon dioxide, and carbon-rich fluid can be obtained after the absorbent absorbs the carbon dioxide and can be used for improving the oil recovery rate after being recovered.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect of the present invention, there is provided a carbon dioxide absorption system comprising an absorption tank; a liquid recovery tank is arranged at the bottom of the absorption box, a liquid outlet pipe is arranged at the bottom of the liquid recovery tank, and a first valve is arranged on the liquid outlet pipe; a T-shaped first liquid spraying pipe is arranged at the top of the absorption box, and a plurality of first spray heads with downward openings are arranged on the first liquid spraying pipe; a first rotating motor is arranged above the absorption box and fixedly connected with the first liquid spraying pipe; the top end of the first liquid spraying pipe extends into the first sleeve, and the other end of the first sleeve is fixedly connected with the first liquid inlet pipe; a T-shaped second liquid spraying pipe is arranged above the liquid recovery tank, and a plurality of second spray heads with upward openings are arranged on the second liquid spraying pipe; the lower part of the second liquid spraying pipe is fixedly connected with a second rotating motor; the tail end of the second liquid spraying pipe extends into a second sleeve, and the other end of the second sleeve is fixedly connected with a second liquid inlet pipe; the second liquid inlet pipe penetrates through the side wall of the absorption box and is communicated with the outer wall; a plurality of air inlet pipes are arranged on the side wall of the absorption box and are positioned between the first liquid spraying pipe and the second liquid spraying pipe; the top of the absorption box is provided with a plurality of air outlets; the gas inlet pipe is connected with the gas cooler through a pipeline; the first liquid inlet pipe and the second liquid inlet pipe are respectively connected with an absorbent configuration box through pipelines, and the absorbent configuration box is respectively provided with a water pipe and an absorbent pipe; the liquid outlet pipe is connected with the liquid storage tank through a pipeline.
Preferably, a plurality of stirrers are arranged on the side walls of the bottom and the top of the liquid recovery tank. The lateral wall at top sets up the agitator and carries out gas-liquid mixture, further mixes carbon dioxide and absorption liquid that will not absorb, improves absorption efficiency.
Preferably, the spraying ranges of the adjacent first spray heads are connected or partially overlapped; the spraying ranges of the adjacent second spray heads are connected or partially overlapped.
Preferably, the first spray head and the second spray head are atomizing spray heads.
Preferably, the first liquid inlet pipe and the second liquid inlet pipe are respectively connected with the absorbent preparation tank through a second pressure pump.
Preferably, the liquid outlet pipe is also provided with a first pressure pump, and the first pressure pump is respectively connected with the first liquid inlet pipe and the second liquid inlet pipe through a return pipeline; and a second valve is arranged on the return pipeline.
Preferably, a third valve is arranged on the first liquid inlet pipe; and a fourth valve is arranged on the second liquid inlet pipe.
Preferably, the return pipeline is also provided with a liquid recovery pipe; a fifth valve is arranged on the liquid recovery pipe; the liquid recovery pipe is connected with the liquid storage tank through a pipeline.
In a second aspect of the present invention, there is provided a method for absorbing carbon dioxide by using the above system, comprising the following steps:
(1) preparing 25 wt% absorption liquid from the carbon dioxide absorbent and water, and introducing gas containing carbon dioxide into the absorption box through an air inlet pipe;
(2) spraying the absorption liquid through atomizing nozzles on the first liquid inlet pipe and the second liquid inlet pipe, fully mixing the absorption liquid with carbon dioxide, and finally dropping the absorption liquid into a liquid recovery tank;
(3) after the absorption liquid in the liquid recovery tank is full, opening the first valve, the second valve and the first pressure pump, sending the absorption liquid into the first liquid inlet pipe and the second liquid inlet pipe through the backflow pipeline, spraying out again, and continuously absorbing carbon dioxide;
(4) and when the pH value of the absorption liquid in the liquid recovery tank is less than or equal to 7.5, closing the second valve, opening the fifth valve, discharging the absorption liquid through the liquid recovery pipe, and then recycling the absorption liquid.
Preferably, the carbon dioxide absorbent is a hyperbranched polyamine carbon dioxide absorbent, the structural formula of the hyperbranched polyamine carbon dioxide absorbent has a repeating structural unit of-A-C-or-B-C-, and the structural formula of A, B, C is as follows:
R1,R2,R3,R4each independently represents-Ar-or C1-C8 unsubstituted or substituted alkyl, wherein Ar is a divalent aromatic group; n is 0 to 4.
The preparation method of the hyperbranched polyamine carbon dioxide absorbent comprises the following steps:
(1) in an organic solvent, pentaerythritol or glycerol reacts with phosphorus tribromide to obtain tetrabromo-pentaerythritol or tribromoglycerol;
(2) in an organic solvent, tetrabromophytiol or tribromoglycerol reacts with a compound with a general formula of P1 under the action of alkali to obtain a compound with an A or B structural formula; the compound with the general formula P1 has the following structural formula:
(3) in an organic solvent, under the action of a reducing agent, a compound with a structural formula A or B reacts with a compound with a structural formula C to obtain the hyperbranched polyamine carbon dioxide absorbent.
Preferably, the hyperbranched polyamine carbon dioxide absorbent absorbs carbon dioxide to obtain a carbon-rich fluid.
The invention has the beneficial effects that:
(1) the system of the invention can not only improve the absorption rate of carbon dioxide, but also improve the use efficiency of the absorbent and reduce the absorption cost of carbon dioxide.
(2) The hyperbranched polyamine carbon dioxide absorbent is used as a material for absorbing carbon dioxide, and the hyperbranched polyamine carbon dioxide absorbent becomes carbon-rich fluid after absorbing carbon dioxide, and can also be used for improving the oil recovery ratio. The method can not only seal carbon dioxide in an oil and gas field, but also improve the recovery ratio of petroleum, reduce the cost of a carbon dioxide capture and sealing technology (CCS), and achieve multiple purposes without separately separating the carbon dioxide in the absorbent.
Drawings
FIG. 1: the structure of the first embodiment of the invention is shown schematically;
FIG. 2: the structure of the second embodiment of the invention is shown schematically;
FIG. 3: a schematic view of the structure of the absorption tank in the first embodiment;
FIG. 4: a schematic view of the structure of the absorption tank in the second embodiment;
FIG. 5: the connection mode of the first liquid spraying pipe and the first liquid inlet pipe and the connection mode of the second liquid spraying pipe and the second liquid inlet pipe are schematically shown;
wherein: 1. the absorption tank, 2, the liquid recovery tank, 3, the liquid outlet pipe, 4, the first valve, 5, the first spray pipe, 6, the first spray head, 7, the first rotating motor, 8, the first sleeve, 9, the first liquid inlet pipe, 10, the second spray pipe, 11, the second spray head, 12, the second rotating motor, 13, the second sleeve, 14, the second liquid inlet pipe, 15, the air inlet pipe, 16, the air outlet, 17, the stirrer, 18, the first pressure pump, 19, the return pipe, 20, the second valve, 21, the third valve, 22, the fourth valve, 23, the fifth valve, 24, the liquid recovery pipe, 25, the gas cooler, 26, the absorbent distribution tank, 27, the water pipe, 28, the absorbent pipe, 29, the liquid storage tank, 30, and the second pressure pump.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
As described in the background section, conventional CO2The trapping process is carried out by using absorbent and CO2Reacting to convert gaseous CO2Is converted into a solution state and then passes through a high temperature (>The carbon dioxide is decomposed and resolved at 120 ℃, purified and compressed, and then stored and transported outside for sealing, and the carbon dioxide capturing and sealing technology (CCS) has higher cost.
Based on this, the present invention provides a method and an absorption system for absorbing carbon dioxide by using a hyperbranched polyamine carbon dioxide absorbent. The invention is derived from CO2The trapping and utilization are comprehensively considered in the whole process, and the absorption capacity is improved by a novel absorbent material:research and development of hyperbranched polyamine carbon dioxide absorbent, so that absorbent can absorb CO2The subsequent solution, namely the carbon-rich fluid can be effectively utilized and is combined with secondary and tertiary oil recovery in the oil field development link, so that the whole high-temperature analysis and gas compression system is removed, the absorption process is greatly simplified, the problems of the traditional process are solved, the investment cost is greatly reduced, the running stability is greatly improved, and CO is greatly reduced2The gathering facility is transformed into an oil field chemical production device for absorbing CO2The waste liquid is changed into valuable, and is used as an oil field chemical with high added value to reinject an oil reservoir to seal and store CO2Meanwhile, the method improves the oil recovery ratio, and is a novel CCUS technology.
Due to CO2The absorption tank is heavier than air, so the first liquid spraying pipe 5 and the second liquid spraying pipe 10 are respectively arranged at the top and the bottom of the absorption tank 1, the air inlet of carbon dioxide is arranged between the first liquid spraying pipe 5 and the second liquid spraying pipe 10, liquid is sprayed through the atomizing nozzle, the absorption rate of the carbon dioxide is improved, the absorption liquid after absorbing the carbon dioxide is changed into carbon-rich fluid, and the carbon-rich fluid is finally discharged and recovered from the liquid recovery tank 2 and is used as an oil displacement agent subsequently. Other unabsorbed gases are discharged through the gas outlet 16 at the top of the absorption tank 1.
A carbon dioxide absorption system, as shown in fig. 1 and 3, a first embodiment of the present invention is: comprises an absorption box 1; a liquid recovery tank 2 is arranged at the bottom of the absorption box 1, a liquid outlet pipe 3 is arranged at the bottom of the liquid recovery tank 2, and a first valve 4 is arranged on the liquid outlet pipe 3; a T-shaped first liquid spraying pipe 5 is arranged at the top of the absorption box 1, and a plurality of first spray heads 6 with downward openings are arranged on the first liquid spraying pipe 5; a first rotating motor 7 is arranged above the absorption box 1, and the first rotating motor 7 is fixedly connected with the first liquid spraying pipe 5; the top end of the first liquid spraying pipe 5 extends into a first sleeve 8, and the other end of the first sleeve 8 is fixedly connected with a first liquid inlet pipe 9; a T-shaped second liquid spraying pipe 10 is arranged above the liquid recovery tank 2, and a plurality of second spray heads 11 with upward openings are arranged on the second liquid spraying pipe 10; the lower part of the second liquid spraying pipe 10 is fixedly connected with a second rotating motor 12; the tail end of the second liquid spraying pipe 10 extends into a second sleeve 13, and the other end of the second sleeve 13 is fixedly connected with a second liquid inlet pipe 14; the second liquid inlet pipe 14 penetrates through the side wall of the absorption box 1 and is communicated with the outer wall; a plurality of air inlet pipes 15 are arranged on the side wall of the absorption box 1, and the air inlet pipes 15 are positioned between the first liquid spraying pipe 5 and the second liquid spraying pipe 10; the top of the absorption box 1 is provided with a plurality of air outlets 16; the air inlet pipe 15 is connected with a gas cooler 25 through a pipeline; the first liquid inlet pipe 9 and the second liquid inlet pipe 14 are respectively connected with an absorbent configuration box 26 through pipelines, and a water pipe 27 and an absorbent pipe 28 are respectively arranged on the absorbent configuration box 26; the liquid outlet pipe 3 is connected with a liquid storage tank 29 through a pipeline.
As shown in fig. 2, a second embodiment of the present invention is: on the basis of the first embodiment, a plurality of stirrers 17 are arranged on the side walls of the bottom and the top of the liquid recovery tank 2. The spraying ranges of the adjacent first nozzles 6 are connected or partially overlapped; the range of the liquid spray between the adjacent second spray heads 11 is connected or partially overlapped. The first spray head 6 and the second spray head 11 are atomizing spray heads. The first liquid inlet pipe 9 and the second liquid inlet pipe 14 are connected to the absorbent distribution tank 26 through a second pressurizing pump 30, respectively. The liquid outlet pipe 3 is also provided with a first pressure pump 18, and the first pressure pump 18 is respectively connected with the first liquid inlet pipe 9 and the second liquid inlet pipe 14 through a return pipeline 19; a second valve 20 is arranged on the return pipe 19. A third valve 21 is arranged on the first liquid inlet pipe 9; a fourth valve 22 is arranged on the second liquid inlet pipe 14. The return pipeline 19 is also provided with a liquid recovery pipe 24; a fifth valve 23 is arranged on the liquid recovery pipe 24; the liquid recovery pipe 24 is connected to a liquid storage tank 29 through a pipe.
In order to make the technical solutions of the present application more clearly understood by those skilled in the art, the technical solutions of the present application will be described in detail below with reference to specific embodiments.
The test materials used in the examples of the present invention are all conventional in the art and commercially available.
Example 1
Preparation of hyperbranched polyamine carbon dioxide absorbent:
a repeating unit of the formula-A-CAnd R is1＝R2＝R3＝R4＝
Preparation of compound P4-1 with n-2;
the structural formula of P4-1 is:
1) pentaerythritol (13.6g, 0.1mol) was dissolved in dry N, N-dimethylformamide (200mL) and phosphorus tribromide (133g, 0.5mol) was added in portions at 25 ℃. After stirring for 20 minutes, the temperature was slowly raised to 125 ℃ for 12 hours. After completion of the reaction, the reaction mixture was poured into ice water (500mL), and sodium hydroxide solution (0.2mol L) was added-1) The pH was adjusted to 8 and the residue was suction filtered to give tetrabromobisphenol (24.6g, 64%).1H NMR(CDCl3,400MHz):δ3.20(s,8H).13C NMR(CDCl3,100MHz):δ146.1,37.9.HR-MS(MALDI):m/z[M]+cacld for C5H8Br4,383.7860；found,387.7319.
2) Tetrabromoquaternary amyl alcohol (19.2g, 0.05mol) prepared in step 1), 4-hydroxybenzaldehyde (26.8g, 0.220mol), and potassium carbonate (41.4g, 0.30mol) were added to N, N-dimethylformamide (250mL) and the temperature was raised to 100 ℃ for reaction for 16 hours. The reaction was poured into ice water (500mL) and the residue was suction filtered to give intermediate A-1(22.9g, 83%).1H NMR(CDCl3,400MHz):δ3.82(s,8H),7.17(d,J＝8.0Hz,8H),7.78(d,J＝8.0Hz,8H),10.02(s,4H).13C NMR(CDCl3,100MHz):δ191.11,165.23,131.92,128.56,114.97,61.23,40.26.HR-MS(MALDI):m/z[M]+cacld for C33H28O8,552.1784；found,553.1790.
3) The intermediate a-1(27.6g, 0.05mol) prepared in step 2) and C-1(n ═ 2) triethylene tetramine (14.6g, 0.10mol) were added to methanol (100mL), and sodium borohydride (7.6g,0.20mol) was added slowly in portions at 0 to 10 ℃. After the addition, the reaction mixture was warmed to room temperature and reacted for 5 hours. The solvent was distilled off under reduced pressure, and the residue was dissolved in chloroform and filtered. Vacuum evaporating the filtrate to obtain hyperbranched polyamine P4-1(33.4g,86％)。1H NMR(CDCl3,400MHz):δ2.52-2.66(m,48H),3.74(s,8H),3.80(s,8H),7.12(d,J＝8.0Hz,8H),7.54(d,J＝8.0Hz,8H).13C NMR(CDCl3,100MHz):δ157.71,156.63,131.82,130.26,127.17,114.20,61.23,52.33,51.20,49.12,48.25,41.26.
Example 2
(1) The carbon dioxide absorbent prepared in example 1 and water were fed into an absorbent preparation tank through an absorbent pipe and a water pipe, respectively, and 25 wt% of an absorbent solution was prepared.
The flue gas source is flue gas after desulfurization in a steel plant, and the flue gas contains 35mg/Nm of sulfur3The carbon dioxide content is 10.6%, and the gas content is 300000Nm3H is used as the reference value. The flue gas is pressurized to a micro-positive pressure of 2000Pa and sent into a gas cooler 25, the flue gas is cooled to a temperature below 30 ℃ from 120 ℃, and gas containing carbon dioxide is introduced into the absorption box through a gas inlet pipe.
(2) According to the liquid-gas ratio of 10L/m3The absorption liquid that will dispose is sent into first feed liquor pipe and second feed liquor pipe through the second booster pump, opens third valve and fourth valve, and the atomizer blowout on through first spray pipe and second spray pipe with the absorption liquid starts first rotating electrical machines and second rotating electrical machines, and first feed liquor pipe and second feed liquor pipe are at the absorption box internal rotation, and absorption liquid and carbon dioxide intensive mixing fall into the liquid recovery pond at last.
(3) And after the absorption liquid in the liquid recovery tank is full, closing the third valve and the fourth valve, opening the first valve, the second valve and the first pressure pump, sending the absorption liquid into the first liquid inlet pipe and the second liquid inlet pipe through the return pipeline, spraying out again, and continuously absorbing carbon dioxide.
(4) When the pH value of the absorption liquid in the liquid recovery tank is equal to 7.5, the absorption liquid absorbs enough carbon dioxide and becomes a carbon-rich fluid. And closing the second valve, opening the fifth valve, discharging the absorption liquid into the liquid storage tank through the liquid recovery pipe for recycling, and recovering the carbon-rich fluid to be used as the oil displacement agent.
Through calculation, the average content of carbon dioxide in the discharged flue gas is 0.11% by monitoring the gas discharged from the gas outlet in real time.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A carbon dioxide absorption system, comprising an absorption tank; a liquid recovery tank is arranged at the bottom of the absorption box, a liquid outlet pipe is arranged at the bottom of the liquid recovery tank, and a first valve is arranged on the liquid outlet pipe; a T-shaped first liquid spraying pipe is arranged at the top of the absorption box, and a plurality of first spray heads with downward openings are arranged on the first liquid spraying pipe; a first rotating motor is arranged above the absorption box and fixedly connected with the first liquid spraying pipe; the top end of the first liquid spraying pipe extends into the first sleeve, and the other end of the first sleeve is fixedly connected with the first liquid inlet pipe; a T-shaped second liquid spraying pipe is arranged above the liquid recovery tank, and a plurality of second spray heads with upward openings are arranged on the second liquid spraying pipe; the lower part of the second liquid spraying pipe is fixedly connected with a second rotating motor; the tail end of the second liquid spraying pipe extends into a second sleeve, and the other end of the second sleeve is fixedly connected with a second liquid inlet pipe; the second liquid inlet pipe penetrates through the side wall of the absorption box and is communicated with the outer wall; a plurality of air inlet pipes are arranged on the side wall of the absorption box and are positioned between the first liquid spraying pipe and the second liquid spraying pipe; the top of the absorption box is provided with a plurality of air outlets; the gas inlet pipe is connected with the gas cooler through a pipeline; the first liquid inlet pipe and the second liquid inlet pipe are respectively connected with an absorbent configuration box through pipelines, and the absorbent configuration box is respectively provided with a water pipe and an absorbent pipe; the liquid outlet pipe is connected with the liquid storage tank through a pipeline.
2. The absorption system according to claim 1 wherein the side walls of the bottom and top of the liquid recovery tank are provided with agitators.
3. The absorption system according to claim 1, wherein the ranges of the liquid spray between adjacent first heads meet or partially overlap; the spraying ranges of the adjacent second nozzles are connected or partially overlapped; the first spray head and the second spray head are atomizing spray heads.
4. The absorption system according to claim 1, wherein the first liquid inlet pipe and the second liquid inlet pipe are respectively connected to the absorbent distribution tank by a second pressurizing pump.
5. The absorption system according to claim 1, wherein the liquid outlet pipe is further provided with a first pressure pump, and the first pressure pump is respectively connected with the first liquid inlet pipe and the second liquid inlet pipe through a return pipeline; and a second valve is arranged on the return pipeline.
6. The absorption system according to claim 5, wherein a third valve is provided on the first liquid inlet pipe; and a fourth valve is arranged on the second liquid inlet pipe.
7. The absorption system according to claim 5, wherein a liquid recovery pipe is further provided on the return conduit; a fifth valve is arranged on the liquid recovery pipe; the liquid recovery pipe is connected with the liquid storage tank through a pipeline.
8. A method for absorbing carbon dioxide using the system of any one of claims 1 to 7, comprising the steps of:
(1) feeding carbon dioxide absorbent and water into an absorbent preparation box through an absorbent pipe and a water pipe respectively, preparing into 25 wt% of absorption liquid, feeding gas containing carbon dioxide into a gas cooler, cooling the gas to below 30 ℃, and introducing the gas containing carbon dioxide into the absorption box through an air inlet pipe;
(2) sending the prepared absorption liquid into the first liquid inlet pipe and the second liquid inlet pipe through a second pressurizing pump, spraying the absorption liquid through atomizing nozzles on the first liquid spraying pipe and the second liquid spraying pipe, fully mixing the absorption liquid with carbon dioxide, and finally dropping the absorption liquid into a liquid recovery tank;
(3) after the absorption liquid in the liquid recovery tank is full, opening the first valve, the second valve and the first pressure pump, sending the absorption liquid into the first liquid inlet pipe and the second liquid inlet pipe through the backflow pipeline, spraying out again, and continuously absorbing carbon dioxide;
(4) and when the pH value of the absorption liquid in the liquid recovery pool is less than or equal to 7.5, closing the second valve, opening the fifth valve, and discharging the absorption liquid into the liquid storage tank through the liquid recovery pipe for recycling.
9. The method of claim 8, wherein the carbon dioxide absorbent is a hyperbranched polyamine carbon dioxide absorbent having a structural formula of repeating structural units of-a-C-or-B-C-, A, B, C having a structural formula as follows:
R1,R2,R3,R4each independently represents-Ar-or C1-C8 unsubstituted or substituted alkyl, wherein Ar is a divalent aromatic group; n is 0 to 4.
10. The method of claim 9, wherein the hyperbranched polyamine carbon dioxide absorbent absorbs carbon dioxide to obtain a carbon-rich fluid.
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| CN114699891A (en) * | 2022-06-06 | 2022-07-05 | 浙江大学 | Carbon dioxide capture device |
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