Carbon dioxide treatment device

Abstract

The invention discloses a carbon dioxide treatment device, which belongs to the technical field of chemical production and comprises a quench tower, a carbon dioxide supply pipeline is arranged at the top of the quench tower, a desalted water pipeline, an alkali liquor pipeline and a spraying pipeline are arranged on one side of the quench tower, and a pressure reducer h is arranged on the quench tower. A wire mesh and a baffle plate are sequentially arranged in the demisting tower from top to bottom, the bottom of the demisting tower is connected with a turning water channel through a pipeline, and the turning water channel is connected with the quench tower through a pipeline; the upper part of the demisting tower is connected with a carbon dioxide recovery device through a pipeline, and 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 reducer e and a pressure gauge c are arranged on the pipeline. The alkali liquor is recovered, the waste of resources is avoided, and meanwhile, the carbon dioxide recovery efficiency is greatly improved through the design of the turning water channel.

Description

Technical Field

[0001] The invention relates to the technical field of chemical production, in particular to a carbon dioxide processing device. Background Art

[0002] As global climate change and environmental problems become increasingly severe, carbon dioxide (CO2) as one of the main greenhouse gases, its emission reduction and recycling have received extensive attention. In the industrial production process, a large amount of high-temperature carbon dioxide generated from the regenerative thermal oxidation (RTO) furnace is discharged into the atmosphere, and effective recovery technology is of great significance for reducing greenhouse gas emissions. However, during the operation of the carbon dioxide recovery device, the temperature is often too high, which is not conducive to the effective absorption of carbon dioxide. The prior art cools carbon dioxide through a quenching tower, and while cooling carbon dioxide with a sodium hydroxide solution in the quenching tower, it also removes heavy components in carbon dioxide, such as methane and ethylene, and then directly sends the cooled and removed carbon dioxide to the carbon dioxide recovery device for recovery. However, when carbon dioxide is cooled by sodium hydroxide lye in the quenching tower to remove heavy components, a large amount of steam will be generated due to the heat exchange, and the vaporized sodium hydroxide contained in the steam will be recovered together with carbon dioxide, making the recovered carbon dioxide component impure, affecting the treatment of the recovered carbon dioxide. Summary of the invention

[0003] In order to solve the technical problems mentioned in the above background technology, the present invention provides a carbon dioxide treatment device, and the technical solution adopted is as follows:

[0004] It comprises a quenching tower, the top of which is provided with a carbon dioxide gas supply pipeline, one side of which is provided with a desalted water pipeline, an alkali solution pipeline and a spray pipeline, a pressure reducer h is provided on the quenching tower, a defogger is provided on one side of the quenching tower, the pressure reducer h is connected to the defogger through a pipeline, and a pressure interlock is connected to the pipeline, a metal mesh and a baffle are sequentially arranged from top to bottom in the defogger, the bottom of the defogger is connected to a turning water channel through a pipeline, the turning water channel is connected to the quenching tower through a pipeline, the upper part of the defogger is connected to a carbon dioxide recovery device through a pipeline, and 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 reducer e and a pressure gauge c are arranged on the pipeline.

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

[0006] Furthermore, the desalted water pipeline includes a pipeline leading to the quenching tower and the pipeline is provided with a valve b, a pressure gauge a, a pressure reducer c and a one-way valve c.

[0007] Furthermore, a branch pipeline is connected to the pipeline where the one-way valve c is located, and the branch pipeline is connected to a pressure reducer b, a valve a and a liquid distributor, and the liquid distributor runs through the interior of the quenching tower.

[0008] Furthermore, the alkali liquid pipeline includes an alkali liquid tank, which is connected to the quenching tower through a pipeline, and a control regulating valve b and a one-way valve d are arranged on the pipeline.

[0009] Furthermore, the spray pipeline includes a liquid distributor arranged on the quenching tower, the liquid distributor is connected to the bottom of the quenching tower through a pipeline, and the pipeline is provided with a control regulating valve a, a flow meter, a one-way valve a and a circulating water pump a.

[0010] Furthermore, a branch pipeline is connected to the pipeline where the circulating water pump a is located, and a circulating water pump b and a one-way valve b are arranged on the branch pipeline.

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

[0012] Furthermore, an external discharge pipeline is provided on the quenching tower and a valve c and a valve d are connected to the external discharge pipeline.

[0013] Furthermore, the pipeline where the pressure gauge c is located is connected in parallel with a branch pipeline, and the branch pipeline is provided with a regulating valve b, a pressurizer f, a centrifugal fan b, a booster fan a, a one-way valve f and a pressure reducer g. The pipeline where the pressure gauge c is located is also connected to another branch pipeline, and the branch pipeline is connected to a regulating valve c.

[0014] The invention has the following advantages: high-temperature carbon dioxide carrying heavy components enters the quenching tower, and the desalted water introduced into the desalted water pipeline and the alkali solution introduced into the alkali solution pipeline are mixed into an alkali solution of a certain concentration, which is sprayed out through the spraying pipeline and contacts the carbon dioxide in the quenching tower, so that the carbon dioxide is cooled and the heavy components in the carbon dioxide are removed. In the process of contact and cooling of the carbon dioxide and the alkali solution, vaporization occurs, that is, the alkali solution is vaporized, and the vaporized alkali solution and the carbon dioxide are first decompressed by a pressure reducer h, and then enter the demisting tower for demisting, so that the vaporized alkali solution is cooled into a liquid state and remains in the demisting tower, and the purified carbon dioxide is sent to the carbon dioxide recovery device through a pipeline, and the alkali solution recovered in the demisting tower is returned to the quenching tower through the turning water channel through the design of the turning water channel at the bottom of the demisting tower. If the amount of alkali liquid in the demister is small, the alkali liquid in the demister will remain at the turning point of the turning water channel and will not flow into the quenching tower, forming a water seal to prevent the carbon dioxide from flowing back into the quenching tower to reduce the recovery rate of carbon dioxide when the amount of alkali liquid in the demister is small. When the amount of alkali liquid recovered in the demister is large enough, the alkali liquid overflows the turning water channel and flows back into the quenching tower. At this time, since the amount of alkali liquid in the demister is large, the alkali liquid layer formed in the demister will hinder the carbon dioxide from entering the quenching tower, which has little effect on the recovery of carbon dioxide. The present invention not only realizes the cooling of carbon dioxide, but also removes the vaporized alkali liquid carried by the carbon dioxide during the cooling, thereby ensuring the purity of the recovered carbon dioxide, but also recovers the alkali liquid, thereby avoiding the waste of resources. At the same time, the design of the turning water channel greatly improves the efficiency of carbon dioxide recovery. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a flow chart of the present invention.

[0016] Attached figure: In the figure: 1-pressure reducer a, 2-thermometer, 3-feed regulating valve, 4-valve a, 5-liquid distributor, 6-flow meter, 7-control regulating 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 reducer b, 15-pressure reducer c, 16-control regulating valve b, 17-check valve c, 18-check valve d, 19-valve c, 20-valve d, 21-demist tower, 22-pressure interlock, 23-quenching tower, 24-baffle Plate, 25-wire mesh, 26-pressure gauge b, 27-regulating valve a, 28-regulating valve b, 29-centrifugal fan a, 30-centrifugal fan b, 31-boosting fan a, 32-boosting fan b, 33-check valve e, 34-check valve f, 35-pressure gauge c, 36-regulating valve c, 37-alkali liquid tank, 38-pressure reducer d, 39-valve e, 40-regulating valve d, 41-valve f, 42-valve g, 43-pressure reducer e, 44-pressure reducer f, 45-pressure reducer g, 46-pressure reducer h, 47-turning channel. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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.

[0018] Please refer to Figure 1 The present invention provides a carbon dioxide processing device, including a quenching tower 23. A carbon dioxide gas supply pipeline is arranged on the top of the quenching tower 23. High-temperature carbon dioxide with heavy components enters the quenching tower 23 through the gas supply pipeline. A desalted water pipeline, an alkaline solution pipeline and a spray pipeline are arranged on one side of the quenching tower 23. Desalted water enters the quenching tower 23 through the desalted water pipeline. Alkaline solution enters the quenching tower 23 through the alkaline solution pipeline. After the desalted water and the alkaline solution are mixed into a certain concentration, they fall in the form of spraying through the spray pipeline. A pressure reducer h46 is arranged on the quenching tower 23. The carbon dioxide is contacted with the alkaline solution through the pressure reducer h46 to reduce the pressure of the generated steam, so as to avoid excessive pressure from rushing into the demisting tower 21, so that the demisting efficiency is low and the purity of carbon dioxide recovery is affected. A demisting tower 21 is arranged on one side of the quenching tower 23. The pressure reducer h46 is connected to the demisting tower 21 through a pipeline, and the pipeline is connected with Pressure interlock 22, through the pressure interlock 22, when the steam pressure in the pressure interlock 22 exceeds the set value, the power supply circuit of the entire equipment can be cut off in time to ensure the safety of operation. Metal mesh 25 and baffle 24 are arranged in sequence from top to bottom in the defogger 21. After the alkali liquid vapor and carbon dioxide enter the defogger 21, they are deflected by the baffle 24, so that the alkali liquid vapor is condensed into liquid, and further intercepted by the metal mesh 25 for defogger. The bottom of the defogger 21 is connected to a turning channel 47 through a pipeline, and the turning channel 47 is connected to the quenching tower 23 through a pipeline. The turning channel 47 is a U-shaped structure. The upper part of the defogger 21 is connected to a carbon dioxide recovery device through a pipeline, and a pressure gauge b26, a regulating valve a27, a valve g42, a centrifugal fan a29, a booster fan a31, a one-way valve e33, a pressure reducer e43 and a pressure gauge c35 are arranged on the pipeline.

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

[0020] The desalted water pipeline includes a pipeline leading to the quench tower 23 and a valve b12, a pressure gauge a13, a pressure reducer c15 and a one-way valve c17 are arranged on the pipeline. The desalted water enters the quench tower 23 through this pipeline.

[0021] The pipeline where the one-way valve c17 is located is connected to a branch pipeline, and the branch pipeline is connected to a pressure reducer b14, a valve a4 and a liquid distributor 5. The liquid distributor 5 penetrates into the quenching tower 23. When the thermometer 2 detects that the temperature of the carbon dioxide in the pipeline where the thermometer 2 is located is too high, the pressure reducer b14 and the valve a4 are opened, and a part of the desalted water in the desalted water pipeline passes through the branch pipeline on this pipeline and falls into the quenching tower 23 in the form of spray through the liquid distributor 5, thereby strengthening the cooling of the carbon dioxide. The alkali liquid pipeline includes an alkali liquid tank 37, in which alkali liquid is stored. The alkali liquid tank 37 is connected to the quenching tower 23 through a pipeline, and a control regulating valve b16 and a one-way valve d18 are arranged on the pipeline. The alkali liquid in the alkali liquid tank 37 enters the quenching tower 23 through this pipeline.

[0022] The spray pipeline includes a liquid distributor 5 arranged on the quenching tower 23. After the desalted water and the alkali solution in the quenching tower 23 are mixed into an alkali solution of a certain concentration, the alkali solution is passed into the pipeline where the one-way valve a8 is located through the circulating water pump a10, and falls in the form of spray through the liquid distributor 5 on this liquid pipeline, thereby cooling the carbon dioxide. The liquid distributor 5 is connected to the bottom of the quenching tower 23 through a pipeline, and a control regulating valve a7, a flow meter 6, a one-way valve a8 and a circulating water pump a10 are arranged on the pipeline.

[0023] The pipeline where the circulating water pump a10 is located is connected to a branch pipeline, and a circulating water pump b11 and a one-way valve b9 are arranged on the branch pipeline. When the circulating water pump a10 fails, the one-way valve b9 can be opened to allow the alkali solution to enter the pipeline where the circulating water pump a10 is located through the spare circulating water pump b11. The pipeline where the circulating pump a10 is located is connected to a branch pipeline, and a pressure reducer b38, a valve f41, a regulating valve d40, a valve e39 and a valve g42 are connected to the branch pipeline. At regular intervals, by opening the valve f41, the regulating valve d40, the valve e39 and the valve g42 and reducing the pressure of the pressure reducer b38, a part of the alkali solution in the pipeline where the circulating water pump a10 is located can be replaced and discharged through the pipeline where the pressure reducer b38 is located, so as to avoid the alkali solution being saturated in removing the heavy components in the carbon dioxide and being unable to remove the heavy components in the carbon dioxide efficiently.

[0024] The quench tower 23 is provided with an external discharge pipeline and the external discharge pipeline is connected with valve c19 and valve d20. When the liquid level in the quench tower 23 is too high, valve c19 and valve d20 can be opened to discharge some alkali liquid in the quench tower 23. The pipeline where the pressure gauge c35 is located is connected in parallel with a branch pipeline and the branch pipeline is provided with a regulating valve b28, a pressurizer f44, a centrifugal fan b30, a booster fan a32, a check valve f34 and a pressure reducer g45. When the pipeline where the centrifugal fan a29 is located fails, the regulating valve b28, the pressurizer f44, the centrifugal fan b30, the booster fan a32, the check valve f34 and the pressure reducer g45 on the branch pipeline are opened. a32, one-way valve f34 and pressure reducer g45, through the pressure adjustment of regulating valve b28, the pressurization of pressurizer f44, and then the pressure reduction through pressure reducer g45, so that the pipeline where pressure gauge b26 is located can ensure the continuous recovery of carbon dioxide; the pipeline where pressure gauge c35 is located is also connected to another branch pipeline and the branch pipeline is connected to the regulating valve c36. When the pressure of carbon dioxide recovered in the pipeline where pressure gauge c35 is located is too high and measured by pressure gauge c35, the regulating valve c36 is opened, and a part of carbon dioxide is separated and sent into the gas seal main pipe of the thermal oxidation furnace through the straight pipeline where regulating valve c36 is located.

[0025] The working principle of the present invention is as follows: open valve b12 and check valve c17, desalted water passes through the pipeline, and enters the quench tower 23 after being decompressed by the pressure reducer c15;

[0026] Open the control regulating valve b16 and the one-way valve d18, and the alkali liquid in the alkali liquid tank 37 enters the quenching tower 23 through the pipeline and mixes with the desalted water to form an alkali liquid of a certain concentration;

[0027] Open the one-way valve a8, control the regulating valve a7, and pump the alkali solution in the quenching tower 23 into the liquid distributor 5 connected to the pipeline through the circulating water pump a10 and the pipeline, and drop it in the form of rain through the liquid distributor 5;

[0028] Open the feed regulating valve 3, the high-temperature carbon dioxide with heavy components generated in the regenerative oxidation furnace passes through the pipeline and enters the quenching tower 23 after being reduced in pressure by the pressure reducer a, and contacts with the alkali solution sprayed and dropped in the quenching tower 23, so that the carbon dioxide is cooled by the alkali solution, and at the same time, the heavy components in the carbon dioxide are absorbed and removed by the alkali solution, and fall back into the quenching tower 23. In this process, a part of the alkali solution is heated and vaporized during the heat exchange, and the cooled carbon dioxide passes through the pressure reducer h46 and then enters the demister tower 21 through the pipeline where the pressure reducer h46 is located, and the steam part in the carbon dioxide contacts the baffle 24 and the metal wire mesh 25, so that the steam is condensed and liquefied, and falls back into the demister tower 21, and the purified carbon dioxide enters the pipeline where the pressure gauge b26 is located, and the regulating valve a27, the valve g42 and the one-way valve e33 are opened, and the carbon dioxide is accelerated and pressurized by the centrifugal fan a29 and the booster fan a31, and then appropriately reduced in pressure by the pressure reducer e43 and sent to the carbon dioxide recovery device to realize the recovery of carbon dioxide;

[0029] When the amount of condensed alkali liquid recovered in the demister 21 is small, the alkali liquid enters the turning water channel 47 through the demister 21 and stays at the turning part of the turning water channel 47. There is no remaining alkali liquid in the demister 21, and the alkali liquid in the turning water channel 47 cannot flow back to the quenching tower 23. At this time, the alkali liquid in the turning water channel 47 forms a water seal, and the carbon dioxide in the demister 21 cannot pass through the water seal to enter the quenching tower 23; when the amount of condensed alkali liquid in the demister 21 is large, there is alkali liquid in the demister 21, and the alkali liquid in the demister 21 also enters the quenching tower 23 through the turning water channel 47 to be recovered. Since there is always alkali liquid in the demister 21, the carbon dioxide cannot flow back to the quenching tower 23 through the alkali liquid in the demister 21, and the carbon dioxide in the demister 21 will not flow back to the quenching tower 23, resulting in a decrease in the recovery efficiency of the carbon dioxide.

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

Claims

1. A carbon dioxide treatment device, comprising a quenching tower (23), wherein a carbon dioxide gas supply pipeline is arranged at the top of the quenching tower (23), and a desalted water pipeline, an alkali solution pipeline and a spray pipeline are arranged on one side of the quenching tower (23), characterized in that: A pressure reducer h (46) is provided on the quenching tower (23), a defogger (21) is provided on one side of the quenching tower (23), the pressure reducer h (46) is connected to the defogger (21) through a pipeline, and a pressure interlock (22) is connected to the pipeline, a metal mesh (25) and a baffle (24) are sequentially provided in the defogger (21) from top to bottom, a turning channel (47) is connected to the bottom of the defogger (21) through a pipeline, and the turning channel (47) is connected to the quenching tower (23) through a pipeline, a carbon dioxide recovery device is connected to the top of the defogger (21) through a pipeline, and a pressure gauge b (26), a regulating valve a (27), a valve g (42), a centrifugal fan a (29), a booster fan a (31), a check valve e (33), a pressure reducer e (43) and a pressure gauge c (35) are provided on the pipeline.

2. A carbon dioxide treatment device according to claim 1, characterized in that: The carbon dioxide gas supply pipeline comprises a pipeline leading to the top of the quench tower (23) and the pipeline is provided with a pressure reducer a (1), a thermometer (2) and a feed regulating valve (3).

3. A carbon dioxide treatment device according to claim 1, characterized in that: The desalted water pipeline includes a pipeline leading to a quenching tower (23) and the pipeline is provided with a valve b (12), a pressure gauge a (13), a pressure reducer c (15) and a one-way valve c (17).

4. A carbon dioxide treatment device according to claim 3, characterized in that: The pipeline where the one-way valve c (17) is located is connected to a branch pipeline, and the branch pipeline is connected to a pressure reducer b (14), a valve a (4) and a liquid distributor (5), and the liquid distributor (5) penetrates into the interior of the quench tower (23).

5. A carbon dioxide treatment device according to claim 1, characterized in that: The alkali liquid pipeline comprises an alkali liquid tank (37), which is connected to the quenching tower (23) via a pipeline, and a control regulating valve b (16) and a one-way valve d (18) are arranged on the pipeline.

6. A carbon dioxide treatment device according to claim 4, characterized in that: The spray pipeline comprises a liquid distributor (5) arranged on the quenching tower (23), the liquid distributor (5) being connected to the bottom of the quenching tower (23) through a pipeline, and a control regulating valve a (7), a flow meter (6), a one-way valve a (8) and a circulating water pump a (10) being arranged on the pipeline.

7. A carbon dioxide treatment device according to claim 5, characterized in that: The pipeline where the circulating water pump a (10) is located is connected to a branch pipeline, and the branch pipeline is provided with a circulating water pump b (11) and a one-way valve b (9).

8. A carbon dioxide treatment device according to claim 6, characterized in that: The pipeline where the circulation pump a (10) is located is connected to a branch pipeline, and the branch pipeline is connected to a pressure reducer b (38), a valve f (41), a regulating valve d (40), a valve e (39) and a valve g (42).

9. A carbon dioxide treatment device according to claim 1, characterized in that: The quench tower (23) is provided with an external discharge pipeline, and the external discharge pipeline is connected to a valve c (19) and a valve d (20).

10. The carbon dioxide treatment device according to claim 1, characterized in that: The pipeline where the pressure gauge c (35) is located is connected in parallel with a branch pipeline, and the branch pipeline is provided with a regulating valve b (28), a pressurizer f (44), a centrifugal fan b (30), a booster fan a (32), a non-return valve f (34) and a pressure reducer g (45). The pipeline where the pressure gauge c (35) is located is also connected to another branch pipeline, and the branch pipeline is connected to a regulating valve c (36).

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