Absorption tower and absorption tower adjusting method

Abstract

The invention provides an absorption tower and an absorption tower adjusting method, and relates to the technical field of absorption towers. A first liquid collecting tank is arranged at the bottom of the absorption area, and the phase separation area is arranged below the first liquid collecting tank; the bottom end of the first liquid collecting tank is communicated with the phase splitting area through an amine-rich liquid feeding pipe; and the split-phase region is provided with a light phase outlet and a heavy phase outlet. The phase splitting area is arranged below the absorption area to realize a phase splitting function, so that the phase splitting area is arranged inside the absorption tower, a phase splitter does not need to be arranged outside the absorption tower, the total occupied area of a project can be reduced, a liquid inlet pump of the phase splitter is omitted, and the investment cost is saved.

Description

Technical Field

[0001] The invention relates to the technical field of absorption towers, and in particular to an absorption tower and an absorption tower adjustment method. Background Art

[0002] With the promotion of carbon capture technology, most research directions are developing towards energy conservation and consumption reduction. Since phase change carbon capture technology only needs to desorb the heavy phase during desorption, it can save nearly half of the energy consumption and thus receives more and more widespread attention.

[0003] Phase change carbon capture technology requires a phase separator to separate the absorbent into light and heavy phases. The heavy phase is desorbed in a desorption tower and then mixed with the light phase for reuse. Phase change carbon capture technology requires a phase separator. The more CO2 is processed, the larger the phase separator is, and the larger the land area is, which becomes a limiting factor for many plants with insufficient on-site space. Summary of the invention

[0004] The object of the present invention is to provide an absorption tower to solve the technical problem that the phase separator in the prior art occupies a large area.

[0005] The absorption tower provided by the present invention comprises an absorption zone and a phase separation zone;

[0006] A first liquid collecting tank is provided at the bottom of the absorption zone, and the phase separation zone is provided below the first liquid collecting tank;

[0007] The bottom end of the first liquid collecting tank is connected with the phase separation zone through a rich amine liquid feed pipe; the phase separation zone is provided with a light phase outlet and a heavy phase outlet.

[0008] Furthermore, the first liquid collecting tank is in an eccentric cone shape.

[0009] Further, the rich amine liquid feed pipe comprises a first pipe body and a second pipe body;

[0010] One end of the first tube body is connected to the bottom end of the first liquid collecting tank, and the other end of the first tube body is connected to the second tube body;

[0011] The first tube body is arranged in a spiral shape, and the axis of the second tube body is arranged along a horizontal direction.

[0012] Furthermore, the light phase outlet is arranged on one side of the phase separation zone, and the outlet of the rich amine liquid feed pipe is arranged toward the other side of the phase separation zone; and a sight glass is arranged below the light phase outlet.

[0013] Furthermore, a selector is provided in the phase separation zone;

[0014] The selector is arranged in close contact with the bottom wall of the phase separation zone and is connected with the heavy phase outlet. The opening of the selector is arranged toward one side of the phase separation zone, and the outlet of the rich amine liquid feed pipe is arranged toward the other side of the phase separation zone.

[0015] Further, the absorption zone includes a primary absorption zone and a secondary absorption zone;

[0016] The secondary absorption zone is arranged above the primary absorption zone;

[0017] The primary absorption zone is provided with a gas distributor, a smoke inlet is provided outside the primary absorption zone, the smoke inlet is communicated with the gas distributor, and the first liquid collecting tank is arranged at the bottom of the primary absorption zone;

[0018] The secondary absorption zone is provided with a secondary absorption zone liquid distributor, a lean amine liquid inlet is provided outside the secondary absorption zone, the lean amine liquid inlet is connected to the secondary absorption zone liquid distributor, and a second liquid collecting tank is provided at the bottom of the secondary absorption zone.

[0019] Furthermore, the primary absorption zone is provided with a primary absorption zone liquid distributor;

[0020] The absorption tower further comprises a cooling pump and an amine liquid cooler, and the second liquid collecting tank, the cooling pump, the amine liquid cooler and the primary absorption zone liquid distributor are connected in sequence.

[0021] Furthermore, the absorption tower further comprises an amine liquid recovery zone, and the amine liquid recovery zone is arranged above the secondary absorption zone;

[0022] A gas cooler is provided in the amine liquid recovery area, and the flow direction of the refrigerant in the gas cooler is perpendicular to the flow direction of the flue gas in the amine liquid recovery area; an amine liquid collecting tank is provided at the bottom of the amine liquid recovery area, and an amine liquid recovery port is provided at the bottom of the amine liquid collecting tank; a flue gas outlet is provided at the top of the amine liquid recovery area.

[0023] The present invention also aims to provide an absorption tower adjustment method, using the absorption tower of the present invention, comprising the following steps:

[0024] The rich amine liquid after absorbing CO2 in the absorption zone enters the first collecting tank, and the rich amine liquid in the first collecting tank enters the phase separation zone through the rich amine liquid feed pipe;

[0025] The rich amine liquid is separated into phases in the phase separation zone, the light phase leaves the phase separation zone through the light phase outlet, and the heavy phase leaves the phase separation zone through the heavy phase outlet.

[0026] Furthermore, the method further comprises the following steps:

[0027] The height of the inner interface of the sight glass is observed by an optical interface meter to control the flow rate of the discharged rich amine liquid and thus control the liquid level at the bottom of the absorption tower.

[0028] The absorption tower provided by the present invention comprises an absorption zone and a phase separation zone; a first liquid collecting tank is provided at the bottom of the absorption zone, and the phase separation zone is arranged below the first liquid collecting tank; the bottom end of the first liquid collecting tank is connected with the phase separation zone through a rich amine liquid feed pipe; the phase separation zone is provided with a light phase outlet and a heavy phase outlet. The phase separation zone is arranged below the absorption zone to realize the phase separation function, so that the phase separation zone is arranged inside the absorption tower, and a phase separator does not need to be arranged outside the absorption tower, which can reduce the total land area of ​​the project, and eliminate the liquid inlet pump of the phase separator, saving investment costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 It is a structural schematic diagram of an absorption tower provided in an embodiment of the present invention.

[0031] Icons: 1-absorption zone; 100-flue gas inlet; 101-gas distributor; 102-primary absorption zone; 103-secondary absorption zone; 104-lean amine liquid inlet; 105-secondary absorption zone liquid distributor; 106-second collecting tank; 107-cooling pump; 108-amine liquid cooler; 109-primary absorption zone liquid distributor; 110-first collecting tank; 2-amine liquid recovery zone; 200-gas cooler; 201-flue gas outlet; 202-refrigerant inlet; 203-refrigerant outlet; 204-amine liquid collecting tank; 205-amine liquid recovery port; 3-phase separation zone; 301-rich amine liquid feed pipe; 302-light phase outlet; 303-heavy phase outlet; 304-selector; 305-sight glass. DETAILED DESCRIPTION

[0032] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] The present invention provides an absorption tower and an absorption tower adjustment method. A plurality of embodiments are given below to describe in detail the absorption tower and the absorption tower adjustment method provided by the present invention.

[0034] Example 1

[0035] The absorption tower provided in this embodiment is as follows Figure 1 As shown, it includes an absorption zone 1 and a phase separation zone 3; a first liquid collecting tank 110 is provided at the bottom of the absorption zone 1, and the phase separation zone 3 is arranged below the first liquid collecting tank 110; the bottom end of the first liquid collecting tank 110 is connected to the phase separation zone 3 through a rich amine liquid feed pipe 301; the phase separation zone 3 is provided with a light phase outlet 302 and a heavy phase outlet 303.

[0036] The rich amine liquid after absorbing CO2 in the absorption zone 1 enters the first collecting tank 110, and the rich amine liquid in the first collecting tank 110 enters the phase separation zone 3 through the rich amine liquid feed pipe 301; the rich amine liquid is phase-separated in the phase separation zone 3, the light phase leaves the phase separation zone 3 through the light phase outlet 302, and the heavy phase leaves the phase separation zone 3 through the heavy phase outlet 303.

[0037] The phase separation zone 3 is arranged below the absorption zone 1 to realize the phase separation function, so that the phase separation zone 3 is arranged inside the absorption tower. There is no need to arrange a phase separator outside the absorption tower, which can reduce the total area of ​​the project, eliminate the liquid inlet pump of the phase separator, and save investment costs.

[0038] Furthermore, the first liquid collecting tank 110 is in an eccentric cone shape.

[0039] The first liquid collecting tank 110 is in an eccentric cone shape. The eccentric cone-shaped first liquid collecting tank 110 and the side wall of the phase separation zone 3 form a cavity, and the rich amine liquid can flow into the cavity.

[0040] The first liquid collecting tank 110 is in an eccentric cone shape, which can effectively prevent the gas and liquid in the absorption zone 1 from affecting the phase separation zone 3 .

[0041] Furthermore, the rich amine liquid feed pipe 301 includes a first tube body and a second tube body; one end of the first tube body is connected to the bottom end of the first liquid collecting tank 110, and the other end of the first tube body is connected to the second tube body; the first tube body is arranged in a spiral shape, and the axis of the second tube body is arranged in the horizontal direction.

[0042] The first tube body is spirally arranged around a vertically arranged axis, and can buffer the disturbance caused to the phase separation zone 3 when the liquid enters the phase separation zone 3. At the same time, the other end of the first tube body is connected to the second tube body, and the axis of the second tube body is arranged in a horizontal direction, so that the liquid leaves the rich amine liquid feed pipe 301 in a horizontal direction, and the outflow direction of the liquid is perpendicular to the outer wall shell of the phase separation zone 3. The impact blocking of the outer wall shell of the phase separation zone 3 is conducive to the stratification of light and heavy phases.

[0043] Furthermore, the light phase outlet 302 is arranged at one side of the phase separation zone 3 , and the outlet of the rich amine liquid feed pipe 301 is arranged toward the other side of the phase separation zone 3 ; a sight glass 305 is arranged below the light phase outlet 302 .

[0044] The light phase outlet 302 is arranged on one side of the outer wall shell of the phase separation zone 3, and the outlet of the rich amine liquid feed pipe 301 is arranged toward the other side of the outer wall shell of the phase separation zone 3. The light phase overflows and leaves the phase separation zone 3 through the light phase outlet 302, and the heavy phase leaves the phase separation zone 3 through the heavy phase outlet 303. The heavy phase outlet 303 is arranged at the bottom of the phase separation zone 3, and the light phase outlet 302 is arranged on the side wall of the phase separation zone 3.

[0045] A sight glass 305 is arranged near the lower part of the light phase outlet 302. The height of the inner interface of the sight glass 305 is observed by an optical interface meter to control the flow rate of the discharged rich amine liquid, thereby controlling the liquid level at the bottom of the absorption tower.

[0046] Furthermore, a selector 304 is provided in the phase separation zone 3; the selector 304 is arranged in contact with the bottom wall of the phase separation zone 3, and the selector 304 is connected to the heavy phase outlet 303, the opening of the selector 304 is arranged toward one side of the phase separation zone 3, and the outlet of the rich amine liquid feed pipe 301 is arranged toward the other side of the phase separation zone 3.

[0047] A selector 304 is arranged at the heavy phase outlet 303, and the selector 304 is fixedly connected to the bottom wall of the phase separation zone 3, the opening of the selector 304 is arranged toward one side of the phase separation zone 3, and the outlet of the rich amine liquid feed pipe 301 is arranged toward the other side of the phase separation zone 3, which can better ensure that the liquid entering the heavy phase outlet 303 is a rich-phase amine liquid.

[0048] Furthermore, the absorption zone 1 includes a primary absorption zone 102 and a secondary absorption zone 103; the secondary absorption zone 103 is arranged above the primary absorption zone 102; the primary absorption zone 102 is provided with a gas distributor 101, a flue gas inlet 100 is provided on the outer side of the primary absorption zone 102, the flue gas inlet 100 is connected to the gas distributor 101, and a first collecting tank 110 is arranged at the bottom of the primary absorption zone 102; the secondary absorption zone 103 is provided with a secondary absorption zone liquid distributor 105, a lean amine liquid inlet 104 is provided on the outer side of the secondary absorption zone 103, the lean amine liquid inlet 104 is connected to the secondary absorption zone liquid distributor 105, and a second collecting tank 106 is provided at the bottom of the secondary absorption zone 103.

[0049] The flue gas from the outside enters the gas distributor 101 through the flue gas inlet 100, and then enters the primary absorption zone 102 from the gas distributor 101 to react with the cooled amine liquid. The primary absorption zone 102 is connected to the secondary absorption zone 103. The flue gas after the reaction in the primary absorption zone 102 enters the secondary absorption zone 103 to react with the initial amine liquid. In the secondary absorption zone 103, the initial amine liquid contacts the flue gas in reverse. The initial amine liquid enters the secondary absorption zone liquid distributor 105 from the lean amine liquid inlet 104, and enters the secondary absorption zone 103 through the secondary absorption zone liquid distributor 105. After the initial amine liquid contacts and reacts with the flue gas, the amine liquid enters the second liquid collecting tank 106.

[0050] Furthermore, the primary absorption zone 102 is provided with a primary absorption zone liquid distributor 109; the absorption tower also includes a cooling pump 107 and an amine liquid cooler 108, and the second liquid collecting tank 106, the cooling pump 107, the amine liquid cooler 108 and the primary absorption zone liquid distributor 109 are connected in sequence.

[0051] The amine liquid in the second liquid collecting tank 106 is transported to the amine liquid cooler 108 for cooling through the cooling pump 107. The cooled amine liquid is sent to the primary absorption zone 102 through the primary absorption zone liquid distributor 109 to continue to absorb CO2 in the flue gas from outside the boundary.

[0052] Furthermore, the absorption tower also includes an amine liquid recovery zone 2, which is arranged above the secondary absorption zone 103; a gas cooler 200 is provided in the amine liquid recovery zone 2, and the flow direction of the refrigerant in the gas cooler 200 is perpendicular to the flow direction of the flue gas in the amine liquid recovery zone 2; an amine liquid collecting tank 204 is provided at the bottom of the amine liquid recovery zone 2, and an amine liquid recovery port 205 is provided at the bottom of the amine liquid collection tank 204; a flue gas outlet 201 is provided at the top of the amine liquid recovery zone 2.

[0053] The amine liquid recovery zone 2, the secondary absorption zone 103, the primary absorption zone 102 and the phase separation zone 3 are arranged in sequence from top to bottom. The primary absorption zone 102 is connected to the secondary absorption zone 103 through a first connecting channel, and the second liquid collecting tank 106 is surrounded outside the first connecting channel. The secondary absorption zone 103 is connected to the amine liquid recovery zone 2 through a second connecting channel, and the amine liquid collecting tank 204 is surrounded outside the second connecting channel.

[0054] The flue gas leaving the secondary absorption zone 103 enters the gas cooler 200 for cooling, and after removing the amine liquid droplets entrained in the flue gas, it leaves the absorption tower through the flue gas outlet 201. After the flue gas temperature is reduced, the amine liquid droplets condense and aggregate to become larger, and settle under the action of gravity. The flue gas is perpendicular to the flow direction of the refrigerant. The refrigerant enters the gas cooler 200 from the refrigerant inlet 202 and exits the gas cooler 200 from the refrigerant outlet 203. The refrigerant goes through a pipeline, and fins are arranged on the pipeline. After the flue gas collides with the pipeline and the fins, the flow direction is changed. The droplets settle into the amine liquid collection tank 204 due to the centripetal force, friction, inertia and collision force. The amine liquid in the amine liquid collection tank 204 overflows to the amine liquid storage tank for reuse through the amine liquid recovery port 205.

[0055] The prior art uses a water washing method to wash amine liquid. The washed amine cannot be reused due to concentration problems, thus generating waste water. The present embodiment recovers the amine liquid by a condensation method. The recovered amine liquid can be directly reused, which not only reduces the amine entrained in the flue gas, but also does not generate waste water, is beneficial to environmental protection, and saves the cost required for replenishing the amine liquid.

[0056] Example 2

[0057] The absorption tower adjustment method provided in this embodiment uses the absorption tower provided in Example 1, comprising the following steps:

[0058] The rich amine liquid after absorbing CO2 in the absorption zone 1 enters the first liquid collecting tank 110, and the rich amine liquid in the first liquid collecting tank 110 enters the phase separation zone 3 through the rich amine liquid feed pipe 301;

[0059] The rich amine liquid is phase-separated in the phase separation zone 3 , the light phase leaves the phase separation zone 3 through the light phase outlet 302 , and the heavy phase leaves the phase separation zone 3 through the heavy phase outlet 303 .

[0060] The phase separation zone 3 is arranged in the absorption tower, below the absorption zone 1, to realize the phase separation function. There is no need to set a phase separator outside the absorption tower, which can reduce the total area of ​​the project, eliminate the liquid inlet pump of the phase separator, and save investment costs.

[0061] Further, the following steps are included:

[0062] The flue gas enters the primary absorption zone 102 through the flue gas inlet 100 and the gas distributor 101, and the amine liquid enters the primary absorption zone 102 through the primary absorption zone liquid distributor 109. The flue gas reacts with the amine liquid in the primary absorption zone 102, and the flue gas after the reaction enters the secondary absorption zone 103;

[0063] The initial amine liquid enters the secondary absorption zone 103 through the lean amine liquid inlet 104 and the secondary absorption zone liquid distributor 105. The amine liquid after the initial amine liquid contacts and reacts with the flue gas enters the second collecting tank 106. The amine liquid in the second collecting tank 106 is transported to the amine liquid cooler 108 for cooling through the cooling pump 107. The cooled amine liquid flows into the primary absorption zone liquid distributor 109. The flue gas after the initial amine liquid contacts and reacts with the flue gas enters the gas cooler 200 for cooling. After the amine liquid droplets entrained in the flue gas are removed, the flue gas leaves the absorption tower through the flue gas outlet 201. The amine liquid droplets entrained in the flue gas settle into the amine liquid collecting tank 204. The amine liquid in the amine liquid collecting tank 204 overflows to the amine liquid storage tank for reuse through the amine liquid recovery port 205.

[0064] Specifically, the flue gas from the outside enters the gas distributor 101 through the flue gas inlet 100, and then enters the primary absorption zone 102 from the gas distributor 101 to react with the cooled amine liquid. The primary absorption zone 102 is connected to the secondary absorption zone 103. The flue gas after the reaction in the primary absorption zone 102 enters the secondary absorption zone 103 to react with the initial amine liquid. In the secondary absorption zone 103, the initial amine liquid contacts the flue gas in reverse direction. The initial amine liquid enters the secondary absorption zone liquid distributor 105 from the lean amine liquid inlet 104, and enters the secondary absorption zone 103 through the secondary absorption zone liquid distributor 105. After the initial amine liquid contacts and reacts with the flue gas, the amine liquid enters the second collecting tank 106. The amine liquid in the second collecting tank 106 is transported to the amine liquid cooler 108 for cooling through the cooling pump 107. The cooled amine liquid is sent to the primary absorption zone 102 through the primary absorption zone liquid distributor 109 to continue to absorb CO2 in the flue gas from the outside. The flue gas leaving the secondary absorption zone 103 enters the gas cooler 200 for cooling, and after removing the amine liquid droplets entrained in the flue gas, it leaves the absorption tower through the flue gas outlet 201. After the flue gas temperature is reduced, the amine liquid droplets condense and aggregate to become larger, and settle under the action of gravity. The flue gas is perpendicular to the flow direction of the refrigerant. The refrigerant enters the gas cooler 200 from the refrigerant inlet 202 and exits the gas cooler 200 from the refrigerant outlet 203. The refrigerant goes through a pipeline, and fins are arranged on the pipeline. After the flue gas collides with the pipeline and the fins, the flow direction is changed. The droplets settle into the amine liquid collection tank 204 due to the centripetal force, friction, inertia and collision force. The amine liquid in the amine liquid collection tank 204 overflows to the amine liquid storage tank for reuse through the amine liquid recovery port 205.

[0065] Furthermore, the method further comprises the following steps: observing the height of the inner interface of the sight glass 305 by an optical interface meter, controlling the flow rate of the discharged rich amine liquid, and thus controlling the liquid level at the bottom of the absorption tower.

[0066] The existing technology uses a density meter or a conductivity meter to measure the interface of the phase separator, which requires multiple measuring instruments to be installed on the phase separator. The optical interface is used to measure the liquid level at the bottom of the absorption tower, which has simple equipment and higher accuracy.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An absorption tower, characterized in that: It includes absorption zone and phase separation zone; A first liquid collecting tank is provided at the bottom of the absorption zone, and the phase separation zone is provided below the first liquid collecting tank; The bottom end of the first liquid collecting tank is connected with the phase separation zone through a rich amine liquid feed pipe; the phase separation zone is provided with a light phase outlet and a heavy phase outlet.

2. The absorption tower according to claim 1, characterized in that The first liquid collecting tank is in an eccentric cone shape.

3. The absorption tower according to claim 1, characterized in that The rich amine liquid feed pipe comprises a first pipe body and a second pipe body; One end of the first tube body is connected to the bottom end of the first liquid collecting tank, and the other end of the first tube body is connected to the second tube body; The first tube body is arranged in a spiral shape, and the axis of the second tube body is arranged along a horizontal direction.

4. The absorption tower according to claim 1, characterized in that The light phase outlet is arranged at one side of the phase separation zone, and the outlet of the rich amine liquid feed pipe is arranged toward the other side of the phase separation zone; a sight glass is arranged below the light phase outlet.

5. The absorption tower according to claim 1, characterized in that A selector is also provided in the phase separation zone; The selector is arranged in close contact with the bottom wall of the phase separation zone and is connected with the heavy phase outlet. The opening of the selector is arranged toward one side of the phase separation zone, and the outlet of the rich amine liquid feed pipe is arranged toward the other side of the phase separation zone.

6. The absorption tower according to claim 1, characterized in that: The absorption zone includes a primary absorption zone and a secondary absorption zone; The secondary absorption zone is arranged above the primary absorption zone; The primary absorption zone is provided with a gas distributor, a smoke inlet is provided outside the primary absorption zone, the smoke inlet is communicated with the gas distributor, and the first liquid collecting tank is arranged at the bottom of the primary absorption zone; The secondary absorption zone is provided with a secondary absorption zone liquid distributor, a lean amine liquid inlet is provided outside the secondary absorption zone, the lean amine liquid inlet is connected to the secondary absorption zone liquid distributor, and a second liquid collecting tank is provided at the bottom of the secondary absorption zone.

7. The absorption tower according to claim 6, characterized in that The primary absorption zone is provided with a primary absorption zone liquid distributor; The absorption tower further comprises a cooling pump and an amine liquid cooler, and the second liquid collecting tank, the cooling pump, the amine liquid cooler and the primary absorption zone liquid distributor are connected in sequence.

8. The absorption tower according to claim 7, characterized in that The absorption tower further comprises an amine liquid recovery zone, which is arranged above the secondary absorption zone; A gas cooler is provided in the amine liquid recovery area, and the flow direction of the refrigerant in the gas cooler is perpendicular to the flow direction of the flue gas in the amine liquid recovery area; an amine liquid collecting tank is provided at the bottom of the amine liquid recovery area, and an amine liquid recovery port is provided at the bottom of the amine liquid collecting tank; a flue gas outlet is provided at the top of the amine liquid recovery area.

9. An absorption tower adjustment method, characterized in that: Using the absorption tower according to any one of claims 1 to 8 comprises the following steps: The rich amine liquid after absorbing CO2 in the absorption zone enters the first collecting tank, and the rich amine liquid in the first collecting tank enters the phase separation zone through the rich amine liquid feed pipe; The rich amine liquid is separated into phases in the phase separation zone, the light phase leaves the phase separation zone through the light phase outlet, and the heavy phase leaves the phase separation zone through the heavy phase outlet.

10. The absorption tower adjustment method according to claim 9, characterized in that: Using the absorption tower according to claim 4, further comprising the following steps: The height of the inner interface of the sight glass is observed by an optical interface meter to control the flow rate of the discharged rich amine liquid and thus control the liquid level at the bottom of the absorption tower.

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