A multifunctional and efficient carbon dioxide absorption reactor

Abstract

The purpose of the present invention is to provide a multifunctional and efficient carbon dioxide absorption reactor, which belongs to the field of carbon dioxide absorption and analysis technology. The upper part of the reactor is a co-current spray section for carbon dioxide capture, the middle part is a packing section for counter-current carbon dioxide absorption, and the lower part is a carbon dioxide analysis section. Under the action of gravity, the solvent passes through the spray section, the packing section and the analysis section in sequence. An absorbent diluter is provided between the spray section and the packing to reduce the absorbent concentration flowing from the spray tower to the packing tower. At the same time, the spray tower serves as the main absorption unit and can use a higher concentration of absorbent. The diluter can ensure that the absorbent concentration flowing through the packing tower is at the economically optimal concentration. The analysis section can re-concentrate the diluted absorbent to a high concentration while analyzing. It solves the problem that the absorbent concentration of the traditional packing tower is limited due to easy corrosion by the absorbent, alleviates the clogging problem of the traditional packing tower, enhances the absorption process, and improves economic benefits.

Description

Technical Field

[0001] The invention belongs to the technical field of carbon dioxide absorption and analysis, and particularly relates to a multifunctional and efficient carbon dioxide absorption reactor. Background Art

[0002] Innovations in carbon dioxide absorption devices are crucial in advancing the industrial application of carbon dioxide capture. The capture and storage of carbon dioxide can effectively reduce CO2 emissions. With the continuous advancement of technology, the manufacturing process requirements for CO2 absorption reactors are becoming increasingly stringent.

[0003] Combustion capture of carbon dioxide is currently the most widely used and mature technology. Among them, the amine-based chemical absorption method in the combustion method is the most commercially promising carbon dioxide capture method due to its high separation purity, high capture rate, and wide range of applications. Traditionally, carbon dioxide is captured in packed towers. Packed towers are prone to clogging, and the packing has high capital and operating costs. In addition, many researchers have reported that increasing the concentration of monoethanolamine (MEA) increases the overall gas side mass transfer coefficient (KG α ), which can greatly improve the absorption efficiency. However, due to its high viscosity and corrosiveness, high-concentration MEA solution will cause serious damage to the filler. Summary of the Invention

[0004] The purpose of the present invention is to provide a multifunctional and efficient carbon dioxide absorption reactor, which solves the problem that traditional packed towers cannot use high-concentration absorbents, effectively enhances the carbon dioxide absorption process, reduces packing corrosion and reduces packing usage, while also improving economic benefits and reducing capital costs.

[0005] The present invention adopts the following technical solutions:

[0006] A multifunctional and efficient carbon dioxide absorption reactor comprises a reactor body, wherein the reactor body is provided with a co-current spraying section for carbon dioxide capture, a packing section for counter-current carbon dioxide absorption and a carbon dioxide desorption section from top to bottom.

[0007] Furthermore, the parallel flow spray section includes a cavity 1, a gas distributor is provided in the cavity 1, a flue gas feed pipe is provided at the top of the side wall of the cavity 1, the gas distributor is located at the bottom of the pipe opening of the flue gas feed pipe, an absorbent delivery pipe is passed through the top of the cavity 1, the pipe opening of the absorbent delivery pipe extends below the gas distributor and is connected to a double nozzle;

[0008] A purified flue gas discharge pipe is provided at the bottom of the other side wall of the cavity one, and an absorbent outlet is provided at the bottom of the cavity one, and the absorbent outlet is in the shape of an inverted frustum.

[0009] Furthermore, the packing section includes a second cavity, in which an absorbent diluter, a liquid distributor, a packing area and a gas distributor are arranged from top to bottom. A gas outlet is provided on the side wall between the absorbent diluter and the liquid distributor, and the gas outlet is connected to the flue gas feed pipe of the co-current spray section;

[0010] The packing area includes a packing filling area, and the upper and lower ends of the packing filling area are respectively provided with a packing pressure plate and a packing support plate. One side wall of the gas distributor is provided with a flue gas feed port, and the other side is provided with a liquid discharge port.

[0011] Furthermore, the absorbent diluter includes an absorbent concentration analysis chamber, an absorbent storage chamber, a solvent storage chamber and an absorbent dilution chamber;

[0012] The absorbent concentration analysis chamber, absorbent storage chamber and solvent storage chamber are located at the same height, arranged in sequence, fixed by slots on all sides, and supported by partitions at the bottom. The absorbent dilution chamber is located below the partition, fixed by slots on all sides, and provided with a support plate at the bottom.

[0013] An absorbent feed pipe is provided on one side of the absorbent concentration analysis chamber, and the absorbent feed pipe is connected to the absorbent outlet of the co-current spray section. An absorbent feed port is provided at the bottom of the absorbent concentration analysis chamber, and an electric stop valve is provided in the absorbent feed port. A vent is provided on one side wall of the absorbent outlet, and an electric stop valve is provided in the vent. An absorbent discharge port is provided on the top of the inner side of the absorbent concentration analysis chamber near the absorbent storage chamber, and an electric stop valve is provided in the absorbent discharge port.

[0014] A mass sensor is provided at the bottom of the absorbent concentration analysis chamber, and the mass sensor is embedded in the groove of the partition. A float type liquid level sensor is provided in the absorbent concentration analysis chamber.

[0015] The bottom of the absorbent storage chamber and the solvent storage chamber are respectively provided with outlets connected to the absorbent dilution chamber, and electric flow regulating valve 1 and electric flow regulating valve 2 are respectively provided in the outlets. Electric flow regulating valve 1 and electric flow regulating valve 2 are respectively electrically connected to the PLC controller. The top of the side wall of the solvent storage chamber is provided with a solvent storage chamber feed port and an electric flow regulating valve.

[0016] A magnetic stirrer is provided at the bottom of the absorbent dilution chamber, a discharge port is provided on one side of the bottom of the absorbent dilution chamber, and an electric flow regulating valve is provided.

[0017] The carbon dioxide desorption section includes a cavity three, in which a top condenser, a top gas-liquid flash evaporator, a gas-liquid mass transfer zone, a bottom reboiler and a bottom gas-liquid flash evaporator are arranged from top to bottom; an absorbent desorption buffer chamber is provided on one side of the cavity three;

[0018] The top condenser is located at the top of the decomposition section. The top of the top condenser is provided with a shell side hot end inlet and a shell side cold end outlet. The shell side hot end inlet is connected to the gas discharge pipeline above the gas-liquid mass transfer zone, and the shell side cold end outlet is connected to the feed inlet of the top gas-liquid flash evaporator. The hot and cold section inlets and outlets of the top condenser tube side are connected to the public works.

[0019] The gas phase outlet of the gas-liquid flash evaporator at the top of the tower is connected to a carbon dioxide outlet pipeline, and the liquid phase outlet is connected to the liquid phase inlet at the top of the gas-liquid mass transfer zone;

[0020] The gas-liquid mass transfer zone is composed of tower plates for gas-liquid mass transfer; the discharge port of the absorbent analysis buffer chamber is connected to the optimal tower plate of the gas-liquid mass transfer zone through a pipeline, the liquid discharge port of the packing section is connected to the feed port of the absorbent analysis buffer chamber through a pipeline, and the discharge port of the absorbent analysis buffer chamber is equipped with an electric shut-off valve;

[0021] The cold end outlet of the tube side of the tower bottom reboiler is connected to the liquid phase outlet below the gas-liquid mass transfer zone, the hot end outlet of the tube side is connected to the feed inlet of the gas-liquid flash evaporator at the bottom of the tower, and the hot and cold section inlets and outlets of the shell side of the tower bottom reboiler are connected to the public works;

[0022] The liquid phase outlet of the gas-liquid flash evaporator at the bottom of the tower is connected to the absorbent outlet pipeline of the analytical section, the absorbent outlet pipeline of the analytical section is connected to the absorbent delivery pump, and the discharge port of the absorbent delivery pump is connected to the absorbent delivery pipe of the parallel flow spray section.

[0023] The beneficial effects of the present invention are as follows:

[0024] 1. This invention provides a multifunctional, high-efficiency carbon dioxide absorber. The absorption section utilizes a co-current spray tower and conventional packing. The integrated design of the spray and packing towers reduces the size of the carbon dioxide absorber. By using the co-current spray tower as the primary absorption unit, the absorber achieves higher carbon dioxide removal efficiency and significantly reduces the amount of packing required compared to conventional absorbers. This reduction in the use of expensive packing is expected to lower capital costs.

[0025] 2. This invention provides a multifunctional, high-efficiency carbon dioxide absorber. The absorbent diluter between the spray section and the packing section reduces the absorbent concentration flowing from the spray tower to the packed tower. This allows the spray tower to use a higher absorbent concentration. This increased absorbent concentration increases the overall gas-side mass transfer coefficient, thereby improving absorption efficiency. The absorbent diluter dilutes the absorbent flowing through the packed tower and controls it to the most economically efficient concentration, thereby improving carbon dioxide removal efficiency and mitigating packing corrosion.

[0026] 3. The present invention provides a multifunctional and efficient carbon dioxide absorber with an integrated design of an absorption tower and a desorption tower, which greatly improves the cycle efficiency of the absorption-desorption-absorption process. Compared with the traditional absorption and desorption process where multiple towers are used separately, the multi-purpose design of the present invention reduces the material transportation pipelines between the absorption equipment and the desorption equipment, reduces energy loss, and reduces capital costs. The absorbent diluter and the desorption tower work together. The absorbent concentration reduced by the diluter is re-concentrated into a high-concentration absorbent at the same time as the desorption is completed, and is recycled back to the top of the spray tower for reuse. The reactor completes a self-circulation, reducing operating costs and improving economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 It is a structural diagram of the parallel flow spray section;

[0029] Figure 3 It is a schematic diagram of the packing section structure;

[0030] Figure 4 Schematic diagram of the absorbent diluter structure;

[0031] Figure 5 This is a schematic diagram of the structure of the carbon dioxide analysis section;

[0032] Wherein: 1-reactor body; 2-parallel flow spray section; 3-packing section; 4-carbon dioxide analysis section; 5-flue gas feed pipe; 6-gas distributor; 7-absorbent delivery pipe; 8-double nozzle; 9-purified flue gas discharge pipe; 10-absorbent outlet; 11-absorbent feed pipe; 12-absorbent diluter; 13-liquid distributor; 14-packing area; 15-gas distributor; 16-gas discharge port; 17-packing pressure plate; 18-packing filling area; 19-packing support plate; 20-flue gas feed port; 21-liquid discharge port; 22-absorbent concentration analysis chamber; 23-absorbent storage chamber; 24-solvent Storage chamber; 25-Absorbent dilution chamber; 26-Absorbent feed port; 27-Vent port; 28-Absorbent discharge port; 29-Mass sensor; 30-Electric flow control valve 1; 31-Solvent storage chamber feed port; 32-Electric flow control valve 2; 33-PLC controller; 34-Magnetic stirrer; 35-Discharge port; 36-Tower top condenser; 37-Tower top gas-liquid flash evaporator; 38-Gas-liquid mass transfer zone; 39-Tower bottom reboiler; 40-Tower bottom gas-liquid flash evaporator; 41-Analysis section absorbent outlet pipeline; 42-Carbon dioxide outlet pipeline; 43-Absorbent analysis buffer chamber; 44-Float-type liquid level sensor. DETAILED DESCRIPTION

[0033] The present invention will be further described with reference to the accompanying drawings.

[0034] As shown in the figure, the present invention provides a multifunctional and efficient carbon dioxide absorber. The upper portion of the reactor is a co-current spray section 2 for carbon dioxide capture, the middle portion is a packing section 3 for counter-current carbon dioxide absorption, and the lower portion is a carbon dioxide desorption section 4. Under the action of gravity, the absorbent passes through the co-current spray section 2, the packing section 3, and the carbon dioxide desorption section 4 in sequence.

[0035] The parallel flow spray section 2 includes a flue gas feed pipe 5, a gas distributor 6, an absorbent delivery pipe 7, a double nozzle 8 and an evolved flue gas discharge pipe 9 and an absorbent outlet 10 at the bottom.

[0036] The flue gas from the packed tower enters the top of the co-current spray section 2 from the flue gas feed pipe 5, and then passes through the gas distributor 6, so that the gas flows downward evenly. The absorbent delivery pipe 7 enters from the center of the top of the spray tower, extends to below the gas distributor 6, and is connected to a double nozzle 8 at the end. The double nozzle 8 guides high-concentration absorbent from both sides. The gas inlet is close to the nozzle, which causes the gas flow near the nozzle to increase, thereby increasing the shear stress applied to the droplet surface. This enhanced shear stress increases the internal circulation of the liquid, thereby increasing the mass transfer rate through the liquid membrane. The flue gas has obvious turbulence near the nozzle tip, which greatly accelerates the absorption of carbon dioxide by the liquid. The spray section is the main absorption unit, absorbing the remaining 70% of carbon dioxide.

[0037] The evolved smoke discharge port is connected to the evolved smoke discharge pipe 9 at the side wall of the lower end of the spray section. The evolved smoke flows out along the pipeline from the discharge port.

[0038] The absorbent outlet 10 is located at the bottom of the spray section, away from the flue gas outlet. It has an inverted frustum-shaped structure, wide at the top and narrow at the bottom, which collects liquid droplets and provides a liquid seal. The bottom end of the absorbent outlet 10 is connected to the absorbent feed pipe 11 of the packing section 3. High-concentration absorbent flows from the absorbent outlet 10 along the absorbent feed pipe 11 into the absorbent diluter 12 of the packing section 3.

[0039] The packing section 3 comprises an absorbent diluter 12 , a liquid distributor 13 , a packing area 14 , a gas distributor 15 , a flue gas inlet 20 , and a gas outlet 16 .

[0040] The flue gas inlet 20 is located below the packing section 3 and is connected to the gas distributor 15. Flue gas first enters through the flue gas inlet 20, then passes through the gas distributor 15, flows evenly upward, and passes through the packing area 14 above the gas distributor 15. Approximately 30% of the carbon dioxide is absorbed by the packing area.

[0041] The gas outlet 16 is located on the side wall of the reactor between the liquid distributor 13 and the absorbent diluter 12 and is connected to the flue gas feed pipe 5 of the co-current spray section 2. The initially absorbed flue gas flows out of the gas outlet 16 through the flue gas feed pipe 5 of the spray section and enters the spray section for further absorption.

[0042] The absorbent diluter 12 includes an absorbent concentration analysis chamber 22, an absorbent storage chamber 23, a solvent storage chamber 24, and an absorbent dilution chamber 25. These chambers are located at the same height, arranged sequentially, and secured by slots around their perimeters. They are independently detachable and supported by a partition at the bottom. The absorbent dilution chamber 25 is located below the partition, secured by slots around its perimeters, is detachable, and has a support plate at its bottom.

[0043] The absorbent concentration analysis chamber 22 includes: an absorbent feed port 26 , a vent port 27 , an absorbent discharge port 28 , a mass sensor 29 , and a float-type liquid level sensor 44 .

[0044] The absorbent feed port 26 is located on the bottom sidewall outside the absorbent concentration analysis chamber 22. It is connected to the absorbent feed pipe 11 and is equipped with an electric shut-off valve. High-concentration absorbent from the packing section 3 enters the absorbent concentration analysis chamber 22 through the absorbent feed port 26 along the absorbent feed pipe 11.

[0045] The vent 27 is located on the side of the absorbent feed pipe 11 close to the outer wall of the reactor and is provided with an electric shut-off valve, which can be used to drain the absorbent in the absorbent concentration analysis chamber 22 in special circumstances.

[0046] A mass sensor 29 is mounted at the bottom of the absorbent concentration analysis chamber 22. This sensor is embedded in a groove within the partition and is integral with the bottom of the chamber. A float-type liquid level sensor 44 floats above the liquid level within the chamber. The mass sensor 29 and liquid level sensor 44 work together to provide real-time computer analysis of the absorbent concentration flowing through the chamber.

[0047] The absorbent discharge port 28 is located on the top sidewall of the absorbent concentration analysis chamber 22 and is connected to the feed port of the absorbent storage chamber 23. It is equipped with an electric shut-off valve. High-concentration absorbent flows out of the absorbent discharge port 28 and enters the absorbent storage chamber 23 for storage.

[0048] The absorbent storage chamber 23 is between the absorbent concentration analysis chamber 22 and the solvent storage chamber 24. The absorbent storage chamber 23 has a discharge port at the bottom thereof and is connected to the absorbent dilution chamber 25. An electric flow regulating valve 30 is also provided.

[0049] The solvent storage chamber 24 is located on the other side of the absorbent storage chamber 23. A solvent storage chamber feed port 31, located at the upper end of the outer inner wall of the solvent storage chamber 24, connects to a solvent feed pipe outside the reactor and is equipped with an electric flow control valve. The absorbent solvent enters the solvent storage chamber 24 through the solvent feed pipe from the solvent storage chamber feed port 31 for storage. The discharge port, located at the bottom center of the solvent storage chamber 24, connects to the absorbent dilution chamber 25 and is equipped with an electric flow control valve 2 32.

[0050] Electric flow control valve 1 30 and electric flow control valve 2 32 are electrically connected to a PLC controller 33. After computer analysis, the PLC controller 33 controls the flow control valves to ensure that the absorbent and solvent enter the absorbent dilution chamber 25 at the appropriate flow rate ratio, ensuring that the absorbent flowing through the packing area 14 is adjusted to the optimal economic concentration.

[0051] The absorbent dilution chamber 25 is located below the partition. It has two feed ports at the top, connected to the outlets of the absorbent storage chamber 23 and the solvent storage chamber 24, respectively. A magnetic stirrer 34 is installed at the bottom of the chamber. The outlet 35 of the absorbent dilution chamber 25 is also located at the bottom and is equipped with an electric flow control valve. The high-concentration solution and solvent entering the absorbent dilution chamber 25 are mixed by the magnetic stirrer 34, resulting in a low-concentration absorbent. The solution then flows out of the outlet 35 and along a pipeline into the liquid distributor 13.

[0052] The liquid distributor 13 is located below the absorbent dilution chamber 25 and is connected to the discharge port of the absorbent dilution chamber 25 via a pipeline. The low-concentration absorbent enters the packing area 14 through the liquid distributor 13 .

[0053] The liquid outlet 21 of the packing section 3 is located on the reactor sidewall opposite the gas distributor 13 and is connected to the absorbent desorption buffer chamber 43 by a pipe. The outlet of the absorbent desorption buffer chamber 43 is equipped with an electric shut-off valve. Low-concentration absorbent flows out of the liquid outlet 21 and enters the absorbent desorption buffer chamber 43.

[0054] The carbon dioxide desorption section 5 includes a tower top condenser 36 , a tower top gas-liquid flash evaporator 37 , a gas-liquid mass transfer zone 38 , a tower bottom reboiler 39 , and a tower bottom gas-liquid flash evaporator 40 .

[0055] The gas-liquid mass transfer zone 38 is composed of trays for gas-liquid mass transfer. The outlet of the absorbent desorption buffer chamber 43 is connected to the optimal feed plate of the gas-liquid mass transfer zone 38 through a pipeline. The absorbent enters the desorption section from the optimal feed plate.

[0056] The decomposed carbon dioxide flows out from the gas phase outlet of the gas-liquid flash evaporator 37 at the top of the tower. The diluted low-concentration absorbent is concentrated again to a high-concentration absorbent after the decomposition is completed, and flows out from the liquid phase outlet of the gas-liquid flash evaporator 40 at the bottom of the tower. It is recirculated back to the spray section through the absorbent delivery pump along the absorbent delivery pipe 7 of the spray section.

[0057] This invention solves the problem of traditional packed towers being easily corroded by the absorbent, which limits absorbent concentration. It alleviates the clogging problem of traditional packed towers, enhances the absorption process, and improves economic benefits. The integrated design of the absorption and desorption towers also significantly improves the cycle efficiency of the absorption-desorption-absorption process.

Claims

1. A multifunctional and efficient carbon dioxide absorption reactor, characterized by: The reactor body (1) comprises a co-current spray section (2) for carbon dioxide capture, a packing section (3) for counter-current carbon dioxide absorption, and a carbon dioxide desorption section (4) provided from top to bottom; The parallel flow spray section (2) includes a cavity one, a gas distributor (6) is provided in the cavity one, a flue gas feed pipe (5) is provided at the top of the side wall of the cavity one, the gas distributor (6) is located at the bottom of the pipe opening of the flue gas feed pipe (5), an absorbent delivery pipe (7) is passed through the top of the cavity one, the pipe opening of the absorbent delivery pipe (7) extends below the gas distributor (6) and is connected to a double nozzle (8); A purified flue gas discharge pipe (9) is provided at the bottom of the other side wall of the cavity one, and an absorbent outlet (10) is provided at the bottom of the cavity one. The absorbent outlet (10) is in the shape of an inverted frustum. The packing section (3) includes a second cavity, wherein an absorbent diluter (12), a liquid distributor (13), a packing area (14) and a gas distributor (15) are provided in the second cavity from top to bottom, and a gas outlet (16) is provided on the side wall between the absorbent diluter (12) and the liquid distributor (13), and the gas outlet (16) is communicated with the flue gas feed pipe (5) of the parallel flow spray section (2); The packing area (14) includes a packing filling area (18), and a packing pressure plate (17) and a packing support plate (19) are respectively provided at the upper and lower ends of the packing filling area (18). A flue gas feed port (20) is provided on one side wall of the gas distributor (15), and a liquid discharge port (21) is provided on the other side.

2. A multifunctional and efficient carbon dioxide absorption reactor according to claim 1, characterized in that: The absorbent diluter (12) comprises an absorbent concentration analysis chamber (22), an absorbent storage chamber (23), a solvent storage chamber (24) and an absorbent dilution chamber (25); The absorbent concentration analysis chamber (22), the absorbent storage chamber (23) and the solvent storage chamber (24) are located at the same height, arranged in sequence, fixed by slots on all sides, and supported by a partition at the bottom; the absorbent dilution chamber (25) is located below the partition, fixed by slots on all sides, and provided with a support plate at the bottom; An absorbent feed pipe (11) is provided on one side of the absorbent concentration analysis chamber (22), and the absorbent feed pipe (11) is connected to the absorbent outlet (10) of the parallel flow spray section (2). An absorbent feed port (26) is provided at the bottom of the absorbent concentration analysis chamber (22), and an electric stop valve is provided in the absorbent feed port (26). A vent (27) is provided on one side wall of the absorbent outlet (10), and an electric stop valve is provided in the vent (27). An absorbent discharge port (28) is provided on the top of the inner side of the absorbent concentration analysis chamber (22) near the absorbent storage chamber (23), and an electric stop valve is provided in the absorbent discharge port (28); A mass sensor (29) is provided at the bottom of the absorbent concentration analysis chamber (22), and the mass sensor (29) is embedded in the groove of the partition. A float-type liquid level sensor (44) is provided in the absorbent concentration analysis chamber (22).

3. The multifunctional and efficient carbon dioxide absorption reactor according to claim 2, characterized in that: The bottoms of the absorbent storage chamber (23) and the solvent storage chamber (24) are respectively provided with outlets connected to the absorbent dilution chamber (25), and the outlets are respectively provided with an electric flow regulating valve 1 (30) and an electric flow regulating valve 2 (32), and the electric flow regulating valve 1 (30) and the electric flow regulating valve 2 (32) are respectively electrically connected to the PLC controller (33), and the top of the side wall of the solvent storage chamber (24) is provided with a solvent storage chamber feed port (31) and an electric flow regulating valve; A magnetic stirrer (34) is provided at the bottom of the absorbent dilution chamber (25), a discharge port (35) is provided on one side of the bottom of the absorbent dilution chamber (25), and an electric flow regulating valve is provided.

4. The multifunctional and efficient carbon dioxide absorption reactor according to claim 1, characterized in that: The carbon dioxide desorption section (4) includes a cavity three, wherein the cavity three is provided with a tower top condenser (36), a tower top gas-liquid flash evaporator (37), a gas-liquid mass transfer zone (38), a tower bottom reboiler (39), and a tower bottom gas-liquid flash evaporator (40) from top to bottom; an absorbent desorption buffer chamber (43) is provided on one side of the cavity three; The tower top condenser (36) is located at the top of the carbon dioxide desorption section (4). A shell side hot end inlet is provided above the tower top condenser (36), and a shell side cold end outlet is provided below the tower top condenser (36). The shell side hot end inlet is connected to the gas discharge pipeline above the gas-liquid mass transfer zone (38), and the shell side cold end outlet is connected to the feed port of the tower top gas-liquid flash evaporator (37). The hot and cold section inlets and outlets of the tower top condenser (36) are connected to the public works. The gas phase outlet of the gas-liquid flash evaporator (37) at the top of the tower is connected to a carbon dioxide outlet pipeline (42), and the liquid phase outlet is connected to the liquid phase inlet at the top of the gas-liquid mass transfer zone (38); The gas-liquid mass transfer zone (38) is composed of tower plates for gas-liquid mass transfer; the discharge port of the absorbent decomposition buffer chamber (43) is connected to the optimal tower plate of the gas-liquid mass transfer zone (38) through a pipeline, the liquid discharge port of the packing section (3) is connected to the feed port of the absorbent decomposition buffer chamber (43) through a pipeline, and the discharge port of the absorbent decomposition buffer chamber (43) is provided with an electric shut-off valve; The cold end outlet of the tube side of the tower bottom reboiler (39) is connected to the liquid phase outlet below the gas-liquid mass transfer zone (38), the hot end outlet of the tube side is connected to the feed port of the tower bottom gas-liquid flash evaporator (40), and the cold and hot section inlets and outlets of the shell side of the tower bottom reboiler (39) are connected to the public works; The liquid phase outlet of the gas-liquid flash evaporator (40) at the bottom of the tower is connected to the analytical section absorbent outlet pipeline (41), the analytical section absorbent outlet pipeline (41) is connected to an absorbent delivery pump, and the discharge port of the absorbent delivery pump is connected to the absorbent delivery pipe (7) of the parallel flow spray section (2).

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