CN219376622U - Hydroxide removal system for removing acid gas absorbent - Google Patents
Hydroxide removal system for removing acid gas absorbent Download PDFInfo
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- CN219376622U CN219376622U CN202223475339.6U CN202223475339U CN219376622U CN 219376622 U CN219376622 U CN 219376622U CN 202223475339 U CN202223475339 U CN 202223475339U CN 219376622 U CN219376622 U CN 219376622U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
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Abstract
The utility model relates to a hydroxide removing system for removing an acid gas absorbent, which comprises a storage tank for storing the acid gas absorbent and a reaction tank for removing hydroxide in the acid gas absorbent, wherein the storage tank is connected with a first circulating pump, the liquid inlet end of the first circulating pump is connected with the storage tank through a pipeline, and the liquid outlet end of the first circulating pump is connected with the reaction tank through a pipeline; the reaction tank is connected with a feeding device for feeding an acidic medicament into the reaction tank, and a stirring device for stirring liquid in the reaction tank and a cooling device for cooling the reaction tank are also arranged in the reaction tank. The beneficial effects of the utility model are as follows: the gas absorbent is led into the reaction tank to react with the acid agent, the tank body of the reaction tank is cooled by the cooling device in the reaction process, the heat generated by the acid-base reaction is rapidly discharged, the damage of high temperature to the reaction tank is reduced, and the reaction can be ensured to be carried out stably.
Description
Technical Field
The utility model relates to the technical field of sewage treatment, in particular to a hydroxide removal system for removing an acid gas absorbent.
Background
The acid gas absorbent is commonly used in the process flows of petrochemical industry, oilfield gas, coal gas and natural gas, and after a period of use, heat stable amine salts are generated, so that a series of problems such as corrosion of devices, increase of energy consumption and the like are caused, at the moment, solvents are required to be purified, and common purification methods include electrodialysis and ion exchange, wherein the ion exchange resin is regenerated by hydroxide (common sodium hydroxide) with stronger alkalinity in the operation process of the ion exchange method, and because the operations of treating the acid gas absorbent and regenerating by the hydroxide are carried out in the same container, the condition that a great amount of hydroxide is mixed into the acid gas absorbent after the problems occur in the device often exist, so that the pH value of the acid gas absorbent is raised to more than 13 or even more than 14, and the acid gas absorbent cannot be directly used.
There is also a case where in some petroleum and petrochemical plants, staff in natural gas plants, by misoperation, hydroxide is mixed into an acid gas absorbent by mistake, and the pH thereof rises to 13 or more and even exceeds 14, and becomes unusable.
The acid gas absorbent with high alkalinity is treated by using the conventional electrodialysis and ion exchange method, so that a better effect cannot be achieved, generally, the solvent can only be treated according to dangerous waste, high treatment cost is required to be paid, and meanwhile, waste of organic amine resources is caused.
Disclosure of Invention
In order to overcome at least part of the defects in the prior art, the utility model provides a hydroxide removal system for removing an acid gas absorbent, which can effectively reduce the pH value of the gas absorbent so that the gas absorbent meets the treatment requirement of electrodialysis.
The utility model relates to a hydroxide removing system for removing an acid gas absorbent, which comprises a storage tank for storing the acid gas absorbent and a reaction tank for removing hydroxide in the acid gas absorbent, wherein the storage tank is connected with a first circulating pump, the liquid inlet end of the first circulating pump is connected with the storage tank through a pipeline, and the liquid outlet end of the first circulating pump is connected with the reaction tank through a pipeline;
the reaction tank is connected with a feeding device for adding an acidic medicament into the reaction tank, and a stirring device for stirring liquid in the reaction tank and a cooling device for cooling the reaction tank are also arranged in the reaction tank.
Further, the stirring device comprises a stirring motor connected to the top of the reaction tank, a stirring rod is connected to the lower end of the stirring motor, and a plurality of stirring blades are connected to the stirring rod.
Further, a pH sensor is arranged in the reaction tank, a liquid outlet of the reaction tank is connected with a second circulating pump, and the liquid outlet of the second circulating pump is communicated with the storage tank through a pipeline.
Further, the cooling device comprises a plurality of cooling fans arranged on the side face of the reaction tank.
Further, the cooling device comprises a circulating pipeline which is arranged around the reaction tank, a liquid inlet of the circulating pipeline is communicated with the cold source, and a liquid outlet of the circulating pipeline is connected with the liquid cooling device and the cooling tank.
Further, the liquid outlet of the cooling tank is connected with the liquid cooling device, the cold source comprises a cold source storage tank for storing low-temperature liquid, and the liquid outlet of the liquid cooling device is connected with the cold source storage tank.
The utility model has the advantages that: the acid gas absorbent is led into the reaction tank to react with the acid agent, the tank body of the reaction tank is cooled through the cooling device in the reaction process, heat generated by the acid-base reaction is rapidly discharged, the damage of high temperature to the reaction tank is reduced, the reaction is ensured to be carried out stably, the pH value of the gas absorbent is further reduced, and the subsequent electrodialysis is facilitated to be carried out normally.
The foregoing and other objects, features and advantages of the utility model will be apparent from the following more particular description of preferred embodiments, as illustrated in the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the hydroxide removal system for removing an acid gas absorbent of example 1.
FIG. 2 is a schematic diagram of the hydroxide removal system for removing acid gas absorbent in example 2.
Fig. 3 is a schematic diagram of the structure of an electrodialysis unit.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Example 1
Referring to fig. 1, a hydroxide removing system for removing an acid gas absorbent comprises a storage tank 1 for storing the acid gas absorbent and a reaction tank 2 for removing hydroxide in the acid gas absorbent, wherein the storage tank 1 is connected with a first circulating pump 3, a liquid inlet end of the first circulating pump 3 is connected with the storage tank 1 through a pipeline, and a liquid outlet end of the first circulating pump 3 is connected with the reaction tank 2 through a pipeline;
the reaction tank 2 is connected with a feeding device 4 for feeding an acidic reagent into the reaction tank 2, and a stirring device 5 for stirring liquid in the reaction tank 2 and a cooling device for cooling the reaction tank 2 are also arranged in the reaction tank.
In the above embodiment, the stirring device 5 includes a stirring motor 51 connected to the top of the reaction tank 5, a stirring rod 52 is connected to the lower end of the stirring motor 51, and a plurality of stirring blades 53 are connected to the stirring rod 52.
In the above embodiment, a pH sensor is disposed in the reaction tank 2, a liquid outlet of the reaction tank 2 is connected to a second circulation pump 6, and a liquid outlet of the second circulation pump 6 is communicated with the storage tank 1 through a pipeline. The cooling device comprises a plurality of cooling fans 8 arranged on the side surface of the reaction tank 2. The volume of the reaction tank 2 is 1/2-3/4 of that of the storage tank 1.
Example 2
Referring to fig. 2, a hydroxide removing system for removing an acid gas absorbent is the same as that of embodiment 1, except that, in order to further enhance the cooling effect, the cooling device includes a circulation pipe 7 disposed around the reaction tank, a liquid inlet of the circulation pipe 7 is communicated with a cold source, and a liquid outlet of the circulation pipe 7 is connected with a liquid cooling device 9 and a cooling tank 10. The liquid outlet of the cooling tank 10 is connected with the liquid cooling device 9, the cold source comprises a cold source storage tank 20 for storing low-temperature liquid, and the liquid outlet of the liquid cooling device 9 is connected with the cold source storage tank 20. The circulation pipe 7 is connected to a liquid cooling circulation pump 71 that pumps the cold source storage tank 20 to the circulation pipe 7.
In the actual working process, the method is used for treating sodium hydroxide in N-Methyldiethanolamine (MDEA), firstly, all acid gas absorbent polluted by hydroxide is transferred to a storage tank 1, and a pH sensor is arranged in the storage tank 1. The reaction tank 2 is made of acid and alkali resistant materials. A stirring device 5 is arranged in the reaction tank 2. A temperature sensor and a pH sensor are provided in the reaction tank 2. The larger exhaust fan 8 or other cooling devices are arranged around the tank, so that the temperature of the reaction tank 2 can be reduced at any time. An acid-resistant dosing pump (feeding device 4) is prepared, an acid-resistant pipeline is connected, and sulfuric acid with the concentration of 50% can be pumped into the reaction tank 2.
When the first circulating pump 3 is started to circulate the acid gas absorbent during operation, the circulating flow is not required to be too large, when the capacity of the acid gas absorbent in the reaction tank 2 is about three quarters of the whole tank body, the stirring device 5 is started to pump 50% of sulfuric acid into the reaction tank 2, the flow is adjusted from small to large, and the flow cannot be too large so as to avoid too rapid temperature rise and incomplete reaction. The pH value and the temperature of the solution in the reaction tank 2 are monitored at any time, and the flow of the dosing pump and the air quantity of the exhaust fan 8 are regulated, so that the temperature of the material is maintained below 50 ℃. When the pH value of the acid gas absorbent in the storage tank 1 is reduced to below 12, the dosing pump is turned off, the circulation is carried out for a period of time, the pH value of the acid gas absorbent in the storage tank is waited for stabilization, the final pH value is required to be stabilized between 11.5 and 12, and the pretreatment is finished.
In summary, the acid gas absorbent is introduced into the reaction tank 2 to react with the sulfuric acid with the concentration of 50%, the tank body of the reaction tank 2 is cooled by the cooling device in the reaction process, the heat generated by the acid-base reaction is rapidly discharged, the damage of high temperature to the reaction tank 2 is reduced, the reaction is ensured to be carried out stably, the pH value of the gas absorbent is reduced, and the subsequent normal electrodialysis is facilitated.
Example 3
Referring to fig. 1 and 3, the main feature is the same as that of embodiment 1, except that an electrodialysis unit including a first cationic membrane 10, a first anionic membrane 20, a second cationic membrane 30, a second anionic membrane 40, and a third anionic membrane 50 is connected to a storage tank;
a solvent introduction passage for introducing an acid gas absorbent is formed between the first cation membrane 10 and the first anion membrane 20, a brine introduction passage for introducing brine is formed between the first anion membrane 20 and the second cation membrane 30, a solvent introduction passage for introducing an acid gas absorbent is formed between the second cation membrane 30 and the second anion membrane 10, and a brine introduction passage for introducing brine is formed between the second anion membrane 10 and the third anion membrane 50.
In the above embodiment, the electrodialysis unit is connected with a solvent circulation tank 60, a brine circulation tank 70 and a polar liquid circulation tank 80, the solvent circulation tank 60 is communicated with a solvent introduction passage, the brine circulation tank 70 is communicated with a brine introduction passage, and the polar liquid circulation tank 80 is connected to the left or right side of the electrodialysis unit.
In the above examples, the cationic film had a thickness of greater than 400 μm, a burst strength of greater than 1000kPa, and the anionic film had a thickness of greater than 250 μm, a burst strength of greater than 1100kPa.
According to the technical scheme, the alkalinity of the polluted solvent can be reduced, the concentration of sulfate radical is increased, the solvent polluted by sodium hydroxide is subjected to sodium removal treatment, the newly increased sulfate radical can be removed while sodium removal is performed by using the electrodialysis unit, the solvent can be treated to a state before pollution, the electrodialysis is improved, the semipermeable membrane resistant to organic pollution is adopted, the service life is long, and the solvent loss is less; the alkalinity is reduced by adding the acid-base regulator, and the solvent loss can be effectively reduced by adding an electrodialysis improvement mode, and the solvent loss rate is much lower than that of the method of directly using an ion exchange method and the method of directly using conventional electrodialysis treatment.
The principles and embodiments of the present utility model have been described in detail with reference to specific examples, which are provided to facilitate understanding of the method and core ideas of the present utility model; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present utility model, the present description should not be construed as limiting the present utility model in view of the above.
Claims (9)
1. A hydroxide removal system for removing an acid gas absorbent, comprising: the acid gas absorbent recycling device comprises a storage tank for storing an acid gas absorbent and a reaction tank for removing hydroxide in the acid gas absorbent, wherein the storage tank is connected with a first circulating pump, the liquid inlet end of the first circulating pump is connected with the storage tank through a pipeline, the liquid outlet end of the first circulating pump is connected with the reaction tank through a pipeline, and the storage tank is also connected with an electrodialysis unit through a pipeline;
the reaction tank is connected with a feeding device for adding an acidic medicament into the reaction tank, and a stirring device for stirring liquid in the reaction tank and a cooling device for cooling the reaction tank are also arranged in the reaction tank.
2. The hydroxide removal system for removing an acid gas absorbent according to claim 1, wherein: the stirring device comprises a stirring motor connected to the top of the reaction tank, a stirring rod is connected to the lower end of the stirring motor, and a plurality of stirring blades are connected to the stirring rod.
3. The hydroxide removal system for removing an acid gas absorbent according to claim 1, wherein: the reaction tank is internally provided with a pH sensor, a liquid outlet of the reaction tank is connected with a second circulating pump, and the liquid outlet of the second circulating pump is communicated with the storage tank through a pipeline.
4. The hydroxide removal system for removing an acid gas absorbent according to claim 1, wherein: the cooling device comprises a plurality of cooling fans arranged on the side face of the reaction tank.
5. The hydroxide removal system for removing an acid gas absorbent according to claim 1, wherein: the cooling device comprises a circulating pipeline which is arranged around the reaction tank, a liquid inlet of the circulating pipeline is communicated with the cold source, and a liquid outlet of the circulating pipeline is connected with the liquid cooling device and the cooling tank.
6. The hydroxide removal system for removing an acid gas absorbent according to claim 5 wherein: the liquid outlet of the cooling tank is connected with the liquid cooling device, the cold source comprises a cold source storage tank for storing low-temperature liquid, and the liquid outlet of the liquid cooling device is connected with the cold source storage tank.
7. The hydroxide removal system for removing an acid gas absorbent according to claim 1, wherein: the electrodialysis unit comprises a first cationic membrane, a first anionic membrane, a second cationic membrane, a second anionic membrane and a third anionic membrane which are sequentially arranged;
a solvent introduction passage for introducing an acid gas absorbent is formed between the first cationic membrane and the first anionic membrane, a brine introduction passage for introducing brine is formed between the first anionic membrane and the second cationic membrane, a solvent introduction passage for introducing an acid gas absorbent is formed between the second cationic membrane and the second anionic membrane, and a brine introduction passage for introducing brine is formed between the second anionic membrane and the third anionic membrane.
8. The hydroxide removal system for removing an acid gas absorbent according to claim 1, wherein: the electrodialysis unit is connected with a solvent circulation tank, a brine circulation tank and a polar liquid circulation tank, the solvent circulation tank is communicated with the solvent introduction channel, the brine circulation tank is communicated with the brine introduction channel, and the polar liquid circulation tank is connected to the left side or the right side of the electrodialysis unit.
9. The hydroxide removal system for removing an acid gas absorbent according to claim 1, wherein: the cationic film has a thickness of greater than 400 μm, a burst strength of greater than 1000kPa, the anionic film has a thickness of greater than 250 μm, and a burst strength of greater than 1100kPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223475339.6U CN219376622U (en) | 2022-12-26 | 2022-12-26 | Hydroxide removal system for removing acid gas absorbent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223475339.6U CN219376622U (en) | 2022-12-26 | 2022-12-26 | Hydroxide removal system for removing acid gas absorbent |
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| Publication Number | Publication Date |
|---|---|
| CN219376622U true CN219376622U (en) | 2023-07-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223475339.6U Active CN219376622U (en) | 2022-12-26 | 2022-12-26 | Hydroxide removal system for removing acid gas absorbent |
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| Country | Link |
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| CN (1) | CN219376622U (en) |
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- 2022-12-26 CN CN202223475339.6U patent/CN219376622U/en active Active
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