Treatment system for carbon dioxide generated by carbon remover in desalted water preparation process

Abstract

The utility model discloses a treatment system for carbon dioxide generated by a carbon remover in a desalted water preparation process, and belongs to the field of waste gas treatment in an industrial water preparation process. The device is arranged in a demineralized water preparation system, the demineralized water preparation system comprises a cation bed, a carbon remover and an anion bed, the carbon remover is arranged between the cation bed and the anion bed, and a continuous passage for demineralized water preparation is formed among the cation bed, the carbon remover and the anion bed; the treatment system comprises an absorption device and a waste alkali liquid temporary storage tank, the carbon remover is connected with the absorption device through a gas collecting pipe, a spraying pipe is arranged in the absorption device, and an exhaust port is formed in the absorption device; the waste alkali liquid temporary storage tank is connected with a waste liquid outlet in the anion bed and is connected with a spraying pipe in the absorption device through a waste alkali liquid conveying pipe, and a liquid outlet of the absorption device is connected with the waste alkali liquid temporary storage tank through a return pipe. Not only is the problem of carbon dioxide emission solved, but also the waste alkali liquor formed in the preparation process of the demineralized water is recycled.

Description

Technical Field

[0001] The utility model relates to a carbon dioxide treatment system, in particular to a carbon dioxide treatment system generated by a carbon remover in a desalted water preparation process, belonging to the field of waste gas treatment in an industrial water preparation process. Background Art

[0002] Demineralized water refers to the process water obtained after removing impurities such as suspended matter, colloids, cations, and anions from water by various water treatment processes. It is widely used in various production lines. In the process of preparing demineralized water by anion and cation exchange (i.e., the "cation bed + carbon removal + anion bed" process), the front end is cation desalination, which mainly removes metal ions such as calcium, magnesium, and sodium; the back end is anion desalination, which mainly removes anions such as silicon dioxide, sulfate, carbonate, nitrate, and chloride. Among them, carbon atoms and silicon atoms are elements of the same family. For this reason, the adsorption capacity of anion resin for carbonate is equivalent to that for silicate. If the carbonate content of the anion bed inlet water is too high, it will accelerate the saturation of the anion resin's ion adsorption capacity, resulting in rapid failure.

[0003] During daily operation, the pH value of the effluent from the cation bed is less than 3.3. It is dispersed by the decarbonizer and blown by the decarbonizer fan, so that the carbon dioxide is separated from the carbonic acid by wind. Under normal conditions, the decarbonizer blows air from the bottom and discharges carbon dioxide with water from the top. The released carbon dioxide is generally discharged in an unconstrained open manner. However, carbon dioxide with a high water content has extremely strong corrosive properties, which leads to serious corrosion of surrounding metal parts, equipment, and structures, directly increasing the anti-corrosion and repair costs of production operations. In addition, CO2 dissolves in the effluent or condensed water to generate hydrocarbon ions (HCQT) and carbonate ions (CCV-), causing electrochemical corrosion of steel equipment parts. CO2 corrosion is hydrogen depolarization corrosion, which is often more serious than strong acid corrosion with the same pH value.

[0004] In addition, the anion resin in the anion bed needs to be regenerated and revived by alkali removal, and the resin cleaning and exchange processes will release a large amount of waste alkali liquid, which will make the comprehensive drainage pH value greater than 11. Summary of the invention

[0005] The utility model combines the existing conditions and resources of the existing desalted water preparation process (such as: waste alkali liquid formed in the anion bed), not only solves the problem of carbon dioxide emissions, but also recycles the waste alkali liquid formed in the desalted water preparation process, that is, utilizes the waste alkali liquid to treat carbon dioxide waste gas. Based on this, a system for treating carbon dioxide generated by a decarbonizer in a desalted water preparation process is proposed.

[0006] In order to achieve the above technical objectives, the following technical solutions are proposed:

[0007] A system for treating carbon dioxide produced by a decarbonator in a desalted water preparation process is provided in the desalted water preparation system. The desalted water preparation system comprises a cation bed, a decarbonator and an anion bed. The decarbonator is provided between the cation bed and the anion bed. A continuous passage for desalted water preparation is formed between the cation bed, the decarbonator and the anion bed.

[0008] The treatment system includes an absorption device and a waste alkali liquid temporary storage tank. The carbon remover is connected to the absorption device through a gas collecting pipe. A spray pipe is provided in the absorption device, and an exhaust port is provided on the absorption device. The waste alkali liquid temporary storage tank is connected to the waste liquid outlet of the cathode bed. The waste alkali liquid temporary storage tank is connected to the spray pipe in the absorption device through a waste alkali liquid conveying pipe. The liquid outlet of the absorption device is connected to the waste alkali liquid temporary storage tank through a reflux pipe.

[0009] A continuous passage for carbon dioxide treatment is formed between the decarbonizer, gas collecting pipe, absorption device, reflux pipe and waste alkali liquid temporary storage tank;

[0010] A continuous passage for conveying the waste alkali liquid is formed between the cathode bed, the waste alkali liquid temporary storage tank, the waste alkali liquid conveying pipe and the spray pipe.

[0011] Preferably, the gas collecting pipe is connected to the top of the decarbonizer to effectively collect and discharge the carbon dioxide in the decarbonizer.

[0012] Preferably, the absorption device is provided with a liquid baffle plate, which is located on the inner side of the exhaust port, to prevent the remaining air after the removal of carbon dioxide from directly blowing away the waste alkali liquid and splashing out of the absorption device, causing the waste alkali liquid to injure people and corrode.

[0013] Preferably, there are at least two absorption devices, and the exhaust port of the upper-stage absorption device is connected to the feed port of the lower-stage absorption device, thereby effectively realizing multi-stage treatment of carbon dioxide and ensuring the quality of carbon dioxide treatment.

[0014] Preferably, a water trap is provided on the reflux pipe, and after the waste alkali liquid is sprayed to absorb carbon dioxide, it flows back to the waste alkali liquid temporary storage tank through the water trap, thereby performing cyclic carbon dioxide absorption and discharge. The setting of the water trap prevents the gas (with a certain wind pressure) in the absorption device from directly entering the waste alkali liquid temporary storage tank through the reflux pipe, causing waste alkali liquid splashing and injury accidents, and at the same time, prevents the unrestrained discharge of gas containing a certain amount of carbon dioxide.

[0015] Preferably, the waste alkali liquid conveying pipe is provided with a conveying pump and a control valve to realize the conveying and interception of the waste alkali liquid.

[0016] Preferably, the waste alkali liquid conveying pipe is also connected to the sewage station. Since the discharge volume of the waste alkali liquid is large and the amount of carbon dioxide formed at the carbon remover is small, a part of the waste alkali liquid formed by the anion bed is used to remove carbon dioxide, and the other part is discharged to the sewage station for centralized treatment.

[0017] In the present technical solution, positional relationships such as "middle", "top", "top", "between", "inside", and "inner side" are defined according to the situations under actual usage conditions. They are conventional terms in this technical field and are also conventional terms used by technical personnel in this field in actual usage.

[0018] The beneficial technical effects brought about by adopting this technical solution are:

[0019] 1. The utility model is based on the characteristics of existing desalted water preparation, and combines the anion bed resin recovery and regeneration process and resin cleaning and exchange, etc., to treat the carbon dioxide formed by the decarbonizer with waste alkali liquid, which not only solves the problem of carbon dioxide emission, but also recycles the waste alkali liquid formed in the desalted water preparation process;

[0020] 2. The utility model can reduce the carbon dioxide (including water) content in the production area to the maximum extent and prevent the concentrated accumulation of carbon dioxide in the production area, which effectively avoids the corrosion of equipment parts, thereby reducing anti-corrosion costs and maintenance investment, and ensuring the stability of the desalted water preparation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a workflow diagram of the utility model;

[0022] In the figure: 1. anion bed, 2. decarbonizer, 3. absorption device, 4. temporary storage tank for waste alkali solution, 5. spray pipe, 6. exhaust port, 7. waste alkali solution conveying pipe, 8. reflux pipe, 9. liquid baffle plate, 10. water trap, 11. conveying pump, 12. control valve, 13. gas collecting pipe. DETAILED DESCRIPTION

[0023] The following is a clear and complete description of the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] Example 1

[0025] A system for treating carbon dioxide produced by a decarbonizer in a desalting water preparation process, such as Figure 1As shown, it is arranged in a desalted water preparation system, the desalted water preparation system includes a cation bed, a decarbonizer 2 and an anion bed 1, the decarbonizer 2 is arranged between the cation bed and the anion bed 1, and a continuous passage for desalted water preparation is formed between the cation bed, the decarbonizer 2 and the anion bed 1; the treatment system includes an absorption device 3 and a waste alkali solution temporary storage tank 4, the decarbonizer 2 is connected to the absorption device 3 through a gas collecting pipe 13, a spray pipe 5 is arranged in the absorption device 3, and an exhaust port 6 is arranged on the absorption device 3; the waste alkali solution temporary storage tank 4 is connected to the waste liquid outlet on the anion bed 1, the waste alkali solution temporary storage tank 4 is connected to the spray pipe 5 in the absorption device 3 through the waste alkali solution conveying pipe 7, and the liquid outlet of the absorption device 3 is connected to the waste alkali solution temporary storage tank 4 through the reflux pipe 8; a continuous passage for carbon dioxide treatment is formed between the decarbonizer 2, the gas collecting pipe 13, the absorption device 3, the reflux pipe 8 and the waste alkali solution temporary storage tank 4; a continuous passage for waste alkali solution conveying is formed between the anion bed 1, the waste alkali solution temporary storage tank 4, the waste alkali solution conveying pipe 7 and the spray pipe 5.

[0026] Example 2

[0027] On the basis of Example 1, this example further defines the gas collecting pipe 13 to further illustrate the technical solution.

[0028] The gas collecting pipe 13 is connected to the top of the decarbonizer 2 to effectively collect and discharge the carbon dioxide in the decarbonizer 2.

[0029] Example 3

[0030] On the basis of Examples 1-2, this example further limits the absorption device 3 to further illustrate the technical solution.

[0031] A liquid baffle plate 9 is provided in the absorption device 3, and the liquid baffle plate 9 is located inside the exhaust port 6. This prevents the remaining air after the carbon dioxide is removed from directly blowing away the waste alkali liquid, splashing out of the absorption device 3, causing the waste alkali liquid to injure people and corrode.

[0032] There are at least two absorption devices 3, and the exhaust port 6 of the upper absorption device 3 is connected to the feed port of the lower absorption device 3, thereby effectively realizing multi-stage treatment of carbon dioxide and ensuring the quality of carbon dioxide treatment.

[0033] Example 4

[0034] On the basis of Examples 1-3, this example further defines the return pipe 8 to further illustrate the technical solution.

[0035] The reflux pipe 8 is provided with a water trap 10. After the waste alkali liquid is sprayed to absorb carbon dioxide, it flows back to the waste alkali liquid temporary storage tank 4 through the water trap 10, thereby performing cyclic carbon dioxide absorption and discharge. The setting of the water trap 10 prevents the gas (with a certain wind pressure) in the absorption device 3 from directly entering the waste alkali liquid temporary storage tank 4 through the reflux pipe 8, causing the waste alkali liquid to splash and injure people, and at the same time, prevents the gas containing a certain amount of carbon dioxide from being discharged without restraint.

[0036] Example 5

[0037] On the basis of Examples 1-4, this example further limits the transportation and control of the waste alkali solution to further illustrate the technical solution.

[0038] The waste alkali liquid conveying pipe 7 is provided with a conveying pump 11 and a control valve 12 to realize the conveying and interception of the waste alkali liquid.

[0039] The waste alkali liquid conveying pipe 7 is also connected to the sewage station. Since the waste alkali liquid discharge is large and the amount of carbon dioxide formed at the carbon remover 2 is small, part of the waste alkali liquid formed by the anion bed 1 is used to remove carbon dioxide, and the other part is discharged to the sewage station for centralized treatment.

[0040] The workflow involved is as follows:

[0041] 1. During the process of alkali feeding when the anion bed 1 fails, the discharge valve in the anion bed 1 is opened, and then the regenerated waste alkali liquid is allowed to enter the waste alkali liquid temporary storage tank 4 for collection (pH is about 11), and the waste alkali liquid generated by the anion bed 1 is pressurized by the delivery pump 11, and a part of the waste alkali liquid is delivered to the sewage station for treatment through the release valve, and the other part (with the control valve 12 opened) is passed through the spray pipe 5 at the top of the absorption device 3 to spray the carbon dioxide in the absorption device 3, which involves the principle of acid-base neutralization reaction;

[0042] 2. In the daily production process, the exhaust pipe on the top of the decarbonizer 2 is connected and the gas collecting pipe 13 is installed, and then it enters the first absorption device 3 and is sprayed and absorbed by the waste alkali solution; then, the remaining gas enters the second absorption device 3 through the gas collecting pipe 13 and is sprayed and absorbed by the waste alkali solution; finally, the remaining gas (air) is discharged to the outside through the exhaust port 6.

Claims

1. A system for treating carbon dioxide produced by a decarbonator in a desalted water preparation process, the system being arranged in the desalted water preparation system, the desalted water preparation system comprising a cation bed, a decarbonator (2) and an anion bed (1), the decarbonator (2) being arranged between the cation bed and the anion bed (1), and a continuous passage for preparing desalted water is formed between the cation bed, the decarbonator (2) and the anion bed (1), wherein: The treatment system comprises an absorption device (3) and a waste alkali liquid temporary storage tank (4); the decarbonizer (2) is connected to the absorption device (3) via a gas collecting pipe (13); a spray pipe (5) is provided in the absorption device (3); and an exhaust port (6) is provided on the absorption device (3); the waste alkali liquid temporary storage tank (4) is connected to the waste liquid outlet on the anion bed (1); the waste alkali liquid temporary storage tank (4) is connected to the spray pipe (5) in the absorption device (3) via a waste alkali liquid conveying pipe (7); and the liquid outlet of the absorption device (3) is connected to the waste alkali liquid temporary storage tank (4) via a reflux pipe (8); A continuous passage for carbon dioxide treatment is formed between the decarbonizer (2), the gas collecting pipe (13), the absorption device (3), the reflux pipe (8) and the waste alkali liquid temporary storage tank (4); A continuous passage for conveying the waste alkali liquid is formed between the cathode bed (1), the waste alkali liquid temporary storage tank (4), the waste alkali liquid conveying pipe (7) and the spray pipe (5).

2. The system for treating carbon dioxide produced by a carbon remover in a desalted water preparation process according to claim 1, characterized in that: The gas collecting pipe (13) is connected to the top of the decarbonizer (2).

3. The system for treating carbon dioxide produced by a decarbonizer in a desalted water preparation process according to claim 1, characterized in that: The absorption device (3) is provided with a liquid baffle plate (9), which is located on the inner side of the exhaust port (6).

4. The system for treating carbon dioxide produced by a decarbonizer in a desalted water preparation process according to claim 1, characterized in that: There are at least two absorption devices (3), and the exhaust port (6) of the upper-stage absorption device (3) is connected to the feed port of the lower-stage absorption device (3).

5. The system for treating carbon dioxide produced by a decarbonizer in a desalted water preparation process according to claim 1, characterized in that: The return pipe (8) is provided with a water trap (10).

6. The system for treating carbon dioxide produced by a decarbonizer in a desalted water preparation process according to claim 1, characterized in that: The waste alkali liquid delivery pipe (7) is provided with a delivery pump (11) and a control valve (12).

7. The system for treating carbon dioxide produced by a decarbonizer in a desalted water preparation process according to claim 1, characterized in that: The waste alkali solution conveying pipe (7) is also connected to a sewage station.

Images