A carbon dioxide treatment device

Abstract

The application discloses a carbon dioxide treatment device and belongs to the technical field of chemical production, which comprises a quenching tower, a carbon dioxide gas supply pipeline arranged at the top of the quenching tower, a desalted water pipeline, a lye pipeline and a spraying pipeline arranged at one side of the quenching tower, a pressure reducer h arranged on the quenching tower, a metal wire mesh and a baffle arranged in the demisting tower from top to bottom, a turning water channel connected to the demisting tower through a pipeline, the turning water channel connected to the quenching tower through a pipeline, a carbon dioxide recovery device connected to the upper part of the demisting tower through a pipeline, and a pressure gauge b, an adjusting valve a, a valve g, a centrifugal fan a, a booster fan a, a check valve e, a pressure reducer e and a pressure gauge c arranged on the pipeline. The application realizes carbon dioxide cooling, removes the vaporized lye carried during carbon dioxide cooling, guarantees the purity of carbon dioxide recovery, recovers the lye, avoids resource waste, and greatly improves the carbon dioxide recovery efficiency through the design of the turning water channel.

Description

Technical Field

[0001] This invention relates to the field of chemical production technology, specifically to a carbon dioxide treatment device. Background Technology

[0002] With the increasing severity of global climate change and environmental problems, carbon dioxide (CO2), as one of the major greenhouse gases, has received widespread attention for emission reduction and recycling. In industrial production processes, large amounts of high-temperature carbon dioxide generated from regenerative thermal oxidizers (RTOs) are emitted into the atmosphere, and effective recovery technologies are crucial for reducing greenhouse gas emissions. However, carbon dioxide recovery devices often encounter excessively high temperatures during operation, which hinders effective carbon dioxide absorption. Existing technologies use quench towers to cool carbon dioxide. While the sodium hydroxide solution in the quench tower cools the carbon dioxide, it also removes heavy components such as methane and ethylene. The cooled and heavy component-removed carbon dioxide is then directly fed into the carbon dioxide recovery device for recycling. However, during the cooling and heavy component removal process in the quench tower, the heat exchange generates a large amount of steam. This steam contains vaporized sodium hydroxide, which is recovered along with the carbon dioxide, resulting in impure recovered carbon dioxide components and affecting the processing of the recovered carbon dioxide. Summary of the Invention

[0003] To address the technical problems mentioned in the background section, the present invention provides a carbon dioxide treatment device, employing the following technical solution:

[0004] The system includes a quench tower, with a carbon dioxide supply pipeline at the top and demineralized water, alkali, and spray pipelines on one side. A pressure regulator h is installed on the quench tower, and a demister tower is installed on one side. The pressure regulator h is connected to the demister tower via a pipeline with a pressure interlock. Inside the demister tower, from top to bottom, are a wire mesh and baffles. A turning water channel is connected to the bottom of the demister tower via a pipeline, and this turning water channel is connected to the quench tower via a pipeline. A carbon dioxide recovery device is connected to the upper part of the demister tower via a pipeline, and the pipeline is equipped with a pressure gauge b, a regulating valve a, a valve g, a centrifugal fan a, a booster fan a, a one-way valve e, a pressure regulator e, and a pressure gauge c.

[0005] Furthermore, the carbon dioxide supply line includes a pipeline leading to the top of the quench tower and is equipped with a pressure reducer, a thermometer, and a feed regulating valve.

[0006] Furthermore, the demineralized water pipeline includes a line leading to the quench tower and is equipped with valve b, pressure gauge a, pressure reducer c, and check valve c.

[0007] Furthermore, the pipeline containing the one-way valve c is connected to a branch pipeline, and the branch pipeline is connected to a pressure reducer b, a valve a, and a liquid distributor, with the liquid distributor extending into the interior of the quench tower.

[0008] Furthermore, the alkali solution pipeline includes an alkali solution tank, which is connected to the quench tower via a pipeline, and the pipeline is equipped with a control regulating valve b and a one-way valve d.

[0009] Furthermore, the spray pipeline includes a liquid distributor installed on the quench tower. The liquid distributor is connected to the bottom of the quench tower via a pipeline, and the pipeline is equipped with a control regulating valve a, a flow meter, a check valve a, and a circulating water pump a.

[0010] Furthermore, the pipeline where circulating water pump a is located is connected to a branch pipeline, and the branch pipeline is equipped with circulating water pump b and check valve b.

[0011] Furthermore, the pipeline where the circulating water pump a is located is connected to a branch pipeline, and the branch pipeline is connected to a pressure reducer b, a valve f, a regulating valve d, a valve e, and a valve g.

[0012] Furthermore, the quench tower is equipped with an external discharge pipeline, and valves c and d are connected to the external discharge pipeline.

[0013] Furthermore, the pipeline containing pressure gauge c is connected in parallel to a branch pipeline, and the branch pipeline is equipped with a regulating valve b, a pressurizer f, a centrifugal fan b, a booster fan a, a check valve f, and a pressure reducer g. The pipeline containing pressure gauge c is also connected to another branch pipeline, and the branch pipeline is connected to a regulating valve c.

[0014] This invention has the following advantages: High-temperature carbon dioxide carrying heavy components enters the quench tower. A certain concentration of alkaline solution, formed by mixing demineralized water from the demineralized water pipeline and alkaline solution from the alkaline solution pipeline, is sprayed out through a spray pipe and comes into contact with the carbon dioxide in the quench tower, thus cooling the carbon dioxide and removing its heavy components. During the cooling process, vaporization occurs between the carbon dioxide and the alkaline solution, i.e., the alkaline solution vaporizes. The vaporized alkaline solution and carbon dioxide are first depressurized by a pressure reducer h, and then enter the demister tower for demisting, allowing the vaporized alkaline solution to cool into a liquid state and remain in the demister tower. The purified carbon dioxide is then sent to a carbon dioxide recovery device through a pipeline. The design of the bend in the water channel at the bottom of the demister tower allows the recovered alkaline solution to be returned to the quench tower via the bend in the water channel. If the amount of alkali solution in the demisting tower is small, it remains at the bend of the turning water channel and does not flow into the quench tower, forming a water seal. This prevents carbon dioxide from flowing back into the quench tower and reducing the carbon dioxide recovery rate when the amount of alkali solution in the demisting tower is small. When the amount of alkali solution recovered in the demisting tower is sufficient, the alkali solution overflows the turning water channel and flows back into the quench tower. At this time, because the amount of alkali solution in the demisting tower is large, the alkali solution layer formed in the demisting tower hinders the carbon dioxide from entering the quench tower, and has little impact on the recovery of carbon dioxide. This invention not only achieves carbon dioxide cooling but also removes the vaporized alkali solution carried by the carbon dioxide during cooling, ensuring the purity of carbon dioxide recovery. It also recovers the alkali solution, avoiding resource waste. At the same time, the design of the turning water channel greatly improves the efficiency of carbon dioxide recovery. Attached Figure Description

[0015] Figure 1 This is a flowchart of the present invention.

[0016] Attached Figure: 1-Pressure regulator a, 2-Thermometer, 3-Feed regulating valve, 4-Valve a, 5-Liquid distributor, 6-Flow meter, 7-Control valve a, 8-Check valve a, 9-Check valve b, 10-Circulating water pump a, 11-Circulating water pump b, 12-Valve b, 13-Pressure gauge a, 14-Pressure regulator b, 15-Pressure regulator c, 16-Control valve b, 17-Check valve c, 18-Check valve d, 19-Valve c, 20-Valve d, 21-Demisting tower, 22-Pressure interlock, 23-Quick cooling tower, 24-Baffle 25-Metal wire mesh, 26-Pressure gauge b, 27-Regulating valve a, 28-Regulating valve b, 29-Centrifugal fan a, 30-Centrifugal fan b, 31-Booster fan a, 32-Booster fan b, 33-Check valve e, 34-Check valve f, 35-Pressure gauge c, 36-Regulating valve c, 37-Alkali tank, 38-Pressure regulator d, 39-Valve e, 40-Regulating valve d, 41-Valve f, 42-Valve g, 43-Pressure regulator e, 44-Pressure regulator f, 45-Pressure regulator g, 46-Pressure regulator h, 47-Bend water channel. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Please refer to Figure 1 This invention provides a carbon dioxide treatment device, including a quench tower 23. A carbon dioxide supply pipeline is installed at the top of the quench tower 23. High-temperature carbon dioxide with heavy components enters the quench tower 23 through the supply pipeline. A demineralized water pipeline, an alkali solution pipeline, and a spray pipeline are installed on one side of the quench tower 23. Demineralized water enters the quench tower 23 through the demineralized water pipeline, and alkali solution enters the quench tower 23 through the alkali solution pipeline. After the demineralized water and alkali solution are mixed to a certain concentration, they fall as sprays through the spray pipeline. A pressure reducer h46 is installed on the quench tower 23. The pressure reducer h46 causes the carbon dioxide to come into contact with the alkali solution, reducing the pressure of the generated vapor and preventing excessive pressure from rushing into the demister tower 21, which would result in low demister efficiency and affect the purity of carbon dioxide recovery. A demister tower 21 is installed on one side of the quench tower 23. The pressure reducer h46 is connected to the demister tower 21 through a pipeline, and the pipeline is connected to... Pressure interlock 22, through which the power supply circuit of the entire equipment can be cut off in time when the steam pressure in pressure interlock 22 exceeds the set value, ensuring safe operation. The demister tower 21 is equipped with metal wire mesh 25 and baffle 24 from top to bottom. After alkaline vapor and carbon dioxide enter the demister tower 21, they are deflected by baffle 24, causing the alkaline vapor to condense into liquid, and further intercepted and demisted by metal wire mesh 25. The bottom of the demister tower 21 is connected to a turning water channel 47 through a pipeline. The turning water channel 47 is connected to the quench tower 23 through a pipeline. The turning water channel 47 has a U-shaped structure. The upper part of the demister tower 21 is connected to a carbon dioxide recovery device through a pipeline, and the pipeline is equipped with pressure gauge b26, regulating valve a27, valve g42, centrifugal fan a29, booster fan a31, one-way valve e33, pressure reducer e43 and pressure gauge c35.

[0019] The carbon dioxide supply pipeline includes a line leading to the top of the quench tower 23 and is equipped with a pressure reducer a1, a thermometer 2 and a feed regulating valve 3. One end of this pipeline is connected to an RTO (regenerative thermal oxidation) furnace, through which high-temperature carbon dioxide with heavy components generated by the regenerative thermal oxidation furnace enters the quench tower 23.

[0020] The demineralized water pipeline includes a line leading to the quench tower 23, and the line is equipped with a valve b12, a pressure gauge a13, a pressure reducer c15, and a check valve c17. The demineralized water enters the quench tower 23 through this pipeline.

[0021] The pipeline containing the one-way valve C17 is connected to a branch pipeline, which in turn is connected to a pressure reducer B14, a valve A4, and a liquid distributor 5. The liquid distributor 5 extends into the quench tower 23. When the thermometer 2 detects that the carbon dioxide temperature in the pipeline containing the thermometer 2 is too high, the pressure reducer B14 and the valve A4 are opened. A portion of the demineralized water in the demineralized water pipeline flows through the branch pipeline on this pipeline and through the liquid distributor 5 in the form of a spray into the quench tower 23, thereby enhancing the cooling of the carbon dioxide. The alkali pipeline includes an alkali tank 37, which stores alkali. The alkali tank 37 is connected to the quench tower 23 through a pipeline, which is equipped with a control regulating valve B16 and a one-way valve D18. The alkali in the alkali tank 37 enters the quench tower 23 through this pipeline.

[0022] The spray pipeline includes a liquid distributor 5 installed on the quench tower 23. The demineralized water and alkaline solution in the quench tower 23 are mixed to form an alkaline solution of a certain concentration. The solution is then pumped into the pipeline where the one-way valve a8 is located via the circulating water pump a10, and falls in the form of spray through the liquid distributor 5 on the liquid pipeline to cool the carbon dioxide. The liquid distributor 5 is connected to the bottom of the quench tower 23 via a pipeline, and the pipeline is equipped with a control regulating valve a7, a flow meter 6, a one-way valve a8, and a circulating water pump a10.

[0023] The pipeline containing circulating water pump A10 is connected to a branch pipeline, which is equipped with circulating water pump B11 and check valve B9. When circulating water pump A10 malfunctions, check valve B9 can be opened to allow alkaline solution to enter the pipeline containing circulating water pump A10 through the backup circulating water pump B11. The pipeline containing circulating water pump A10 is connected to a branch pipeline, which is equipped with pressure reducer D38, valve F41, regulating valve D40, valve E39, and valve G42. Every so often, by opening valves F41, D40, E39, and G42, and by reducing pressure through pressure reducer D38, a portion of the alkaline solution in the pipeline containing circulating water pump A10 can be displaced and discharged through the pipeline containing pressure reducer D38. This prevents the alkaline solution from becoming saturated with heavy components in the carbon dioxide and thus failing to efficiently remove heavy components.

[0024] The quench tower 23 is equipped with an external drain line, and valves C19 and D20 are connected to the external drain line. When the liquid level in the quench tower 23 is too high, valves C19 and D20 can be opened to drain some of the alkaline solution from the quench tower 23. The pipeline containing pressure gauge C35 is connected in parallel to a branch pipeline, and the branch pipeline is equipped with regulating valve B28, pressure booster F44, centrifugal fan B30, booster fan A32, check valve F34, and pressure reducer G45. When the pipeline containing centrifugal fan A29 malfunctions, the regulating valve B28, pressure booster F44, centrifugal fan B30, and booster fan on the branch pipeline can be opened. A32, one-way valve F34, and pressure reducer G45, through regulating valve B28, pressurizing by pressurizer F44, and then depressurizing by pressure reducer G45, ensure that the pipeline where pressure gauge B26 is located can continue to recover carbon dioxide; the pipeline where pressure gauge C35 is located is also connected to another branch pipeline, and the branch pipeline is connected to regulating valve C36. When the pressure of recovered carbon dioxide in the pipeline where pressure gauge C35 is located is too high and is measured by pressure gauge C35, regulating valve C36 is opened, and a portion of carbon dioxide is sent to the gas seal main pipe of the regenerative oxidizer through the straight pipeline where regulating valve C36 is located.

[0025] The working principle of this invention is as follows: When valve B12 and check valve C17 are opened, the demineralized water passes through the pipeline and enters the quench tower 23 after being depressurized by pressure reducer C15.

[0026] Open the control valve b16 and the check valve d18, and the alkali solution in the alkali tank 37 enters the quench tower 23 through the pipeline, where it mixes with the demineralized water to form an alkali solution of a certain concentration.

[0027] Open the one-way valve a8 and control the regulating valve a7. The alkaline solution in the quench tower 23 is pumped into the liquid distributor 5 connected to the pipeline through the circulating water pump a10 and the pipeline. The solution then falls in the form of rain through the liquid distributor 5.

[0028] When the feed regulating valve 3 is opened, the high-temperature carbon dioxide containing heavy components generated in the regenerative oxidizer enters the quench tower 23 through this pipeline and after being depressurized by the pressure reducer a. It comes into contact with the alkaline solution sprayed down in the quench tower 23, causing the carbon dioxide to be cooled by the alkaline solution. At the same time, the heavy components in the carbon dioxide are absorbed and removed by the alkaline solution and fall back into the quench tower 23. During this process, a part of the alkaline solution is heated and vaporized during heat exchange. Along with the cooled carbon dioxide, it is depressurized by the pressure reducer h46 and enters the demister tower 21 through the pipeline where the pressure reducer h46 is located. The vapor part of the carbon dioxide comes into contact with the baffle plate 24 and the metal wire mesh 25, causing the vapor to condense and liquefy and fall back into the demister tower 21. The purified carbon dioxide enters the pipeline where the pressure gauge b26 is located. When the regulating valve a27, valve g42 and check valve e33 are opened, the carbon dioxide is accelerated and pressurized by the centrifugal fan a29 and the booster fan a31, and then sent to the carbon dioxide recovery device after being appropriately depressurized by the pressure reducer e43, so as to realize the recovery of carbon dioxide.

[0029] When the amount of condensed alkali recovered in the demister 21 is small, the alkali enters the turning water channel 47 through the demister 21 and stays at the bend of the turning water channel 47. There is no alkali remaining in the demister 21, and the alkali in the turning water channel 47 cannot flow back to the quench tower 23. At this time, the alkali in the turning water channel 47 forms a water seal, and the carbon dioxide in the demister 21 cannot enter the quench tower 23 through the water seal. When the amount of condensed alkali in the demister 21 is large, there is alkali in the demister 21, and the alkali in the demister 21 also enters the quench tower 23 through the turning water channel 47 for recovery. However, since there is always alkali in the demister 21, the carbon dioxide also cannot flow back to the quench tower 23 through the alkali in the demister 21. This results in a decrease in the carbon dioxide recovery efficiency.

[0030] This invention is simple to operate, convenient to use, and suitable for widespread promotion and application. Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A carbon dioxide treatment device, comprising a quench tower (23), the top of the quench tower (23) is provided with a carbon dioxide supply pipeline, one end of the pipeline is connected with an RTO regenerative oxidation furnace, and the quench tower (23) is provided with a desalted water pipeline, a lye pipeline and a spraying pipeline on one side, characterized in that, A pressure reducer h (46) is arranged on the quench tower (23), a demisting tower (21) is arranged on one side of the quench tower (23), the pressure reducer h (46) is connected with the demisting tower (21) through a pipeline, and a pressure interlock (22) is connected on the pipeline; the demisting tower (21) is sequentially provided with a wire mesh (25) and a baffle (24) from top to bottom; a turning water channel (47) is connected to the demisting tower (21) through a pipeline; the turning water channel (47) is connected with the quench tower (23) through a pipeline; the demisting tower (21) is connected with a carbon dioxide recovery device through a pipeline, and a pressure gauge b (26), an adjusting valve a (27), a valve g (42), a centrifugal fan a (29), a booster fan a (31), a one-way valve e (33), a pressure reducer e (43) and a pressure gauge c (35) are arranged on the pipeline; The carbon dioxide gas supply pipeline comprises a pipeline leading to the top of the quench tower (23), and a pressure reducer a (1), a thermometer (2) and a feed adjusting valve (3) are arranged on the pipeline; The desalted water pipeline comprises a pipeline leading to the quench tower (23), and a valve b (12), a pressure gauge a (13), a pressure reducer c (15) and a one-way valve c (17) are arranged on the pipeline.

2. The carbon dioxide treatment device of claim 1, wherein, A branch pipeline is connected to the pipeline where the one-way valve c (17) is located, and a pressure reducer b (14), a valve a (4) and a liquid distributor (5) are arranged on the branch pipeline; the liquid distributor (5) penetrates into the inside of the quench tower (23).

3. The carbon dioxide treatment device of claim 1, wherein, The lye pipeline comprises a lye tank (37), the lye tank (37) is connected with the quench tower (23) through a pipeline, and a control adjusting valve b (16) and a one-way valve d (18) are arranged on the pipeline.

4. The carbon dioxide treatment device of claim 3, wherein, The spray pipeline comprises a liquid distributor (5) arranged on the quench tower (23), the liquid distributor (5) is connected with the bottom of the quench tower (23) through a pipeline, and a control adjusting valve a (7), a flowmeter (6), a one-way valve a (8) and a circulating water pump a (10) are arranged on the pipeline.

5. The carbon dioxide treatment device of claim 4, wherein, A branch pipeline is connected to the pipeline where the circulating water pump a (10) is located, and a circulating water pump b (11) and a one-way valve b (9) are arranged on the branch pipeline.

6. The carbon dioxide treatment device of claim 5, wherein, A branch pipeline is connected to the pipeline where the circulating water pump a (10) is located, and a pressure reducer d (38), a valve f (41), an adjusting valve d (40), a valve e (39) and a valve g (42) are arranged on the branch pipeline.

7. The carbon dioxide treatment device of claim 1, wherein, An external discharge pipeline is arranged on the quench tower (23), and a valve c (19) and a valve d (20) are connected on the external discharge pipeline.

8. The carbon dioxide treatment device of claim 1, wherein, A branch pipeline is connected in parallel to the pipeline where the pressure gauge c (35) is located, and an adjusting valve b (28), a pressure booster f (44), a centrifugal fan b (30), a booster fan a (32), a one-way valve f (34) and a pressure reducer g (45) are arranged on the branch pipeline; another branch pipeline is also connected to the pipeline where the pressure gauge c (35) is located, and an adjusting valve c (36) is connected on the branch pipeline.

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