CN218893743U - Salt-containing wastewater electrolytic hydrogen production coupling carbon fixing system - Google Patents
Salt-containing wastewater electrolytic hydrogen production coupling carbon fixing system Download PDFInfo
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- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 56
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 31
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- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 25
- 239000003513 alkali Substances 0.000 claims description 24
- 238000009826 distribution Methods 0.000 claims description 22
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- 238000012856 packing Methods 0.000 claims 1
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- 229910002092 carbon dioxide Inorganic materials 0.000 abstract description 4
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- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 description 2
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
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Images
Classifications
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
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- Treating Waste Gases (AREA)
Abstract
The utility model provides a salt-containing wastewater electrolytic hydrogen production coupling carbon fixing system which comprises a pretreatment system, an electrolytic tank, a gas-liquid reaction tower and an evaporation crystallization tower. The salt-containing wastewater enters an electrolytic tank after being pretreated; generating hydrogen and NaOH solution at a cathode, recovering the hydrogen as an energy source substance, enabling the NaOH solution to enter a gas-liquid reaction tower to contact and react with carbon-rich flue gas, fixing carbon dioxide in the flue gas, and generating NaHCO 3 A solution; separation of NaHCO from solution by low temperature air evaporative crystallization 3 The remaining salt-containing solution is re-subjected to the electrolysis reaction. The system has reasonable design, and realizes the treatment and recycling of wastewater and the production of energy materials.
Description
Technical Field
The utility model relates to the technical field of wastewater treatment, in particular to a salt-containing wastewater electrolytic hydrogen production coupling carbon fixing system.
Background
Under the conditions of water resource shortage and increasingly serious water pollution, the treatment and recycling efficiency of water is improved, the near zero emission of wastewater is gradually emphasized, and the near zero emission engineering implementation of wastewater is developed in the industries of electric power, coal chemical industry and the like. At present, near zero emission of wastewater mainly adopts pretreatment, concentration, crystallization or drying processes, wherein the pretreatment mainly comprises the steps of removing organic matters, heavy metals, calcium, magnesium and other hardness ions in the wastewater, and finally, the residual pollutants in the wastewater mainly comprise sodium salts and potassium salts, and the anions mainly comprise chloride ions. The salt-containing wastewater is finally concentrated and crystallized to form waste salt, or is mixed with solid wastes such as coal ash and the like, and the waste salt is not fully utilized. In the future, with the advancement of zero emission of wastewater, a large amount of strong brine will bring about secondary environmental problems.
The strong brine can be used as an important electrolyte in the electrolysis process, and the electrolyzed strong brine mainly generates energy substances such as hydrogen, and the hydrogen is a green and efficient secondary energy source and has wide application space in the fields of traffic, electric power, chemical industry and the like. Therefore, the concentrated brine can be used as an important raw material in the electrolytic hydrogen production process. Therefore, the electrolytic hydrogen production of the salt-containing wastewater has great application potential.
Therefore, how to provide a system for producing hydrogen by electrolyzing salt-containing wastewater, which realizes the comprehensive utilization of the salt-containing wastewater through the electrolysis process, and generates green energy material hydrogen is a technical problem which needs to be solved by the technicians in the field.
Disclosure of Invention
The utility model aims to solve at least one of the technical problems in the related art to a certain extent, and provides a salt-containing wastewater electrolytic hydrogen production coupling carbon fixing system, which realizes the comprehensive utilization of salt-containing wastewater through an electrolytic process to generate green energy substance hydrogen, and simultaneously, the electrolyte can be further used for fixing carbon dioxide to promote carbon neutralization.
In view of the above, according to a first object of the present utility model, there is provided a coupled carbon sequestration system for electrolytic hydrogen production from brine wastewater, comprising
An electrolytic cell in which anode chambers and cathode chambers, and diaphragms isolating the anode chambers and the cathode chambers are alternately arranged;
the gas-liquid reaction tower is arranged at the downstream of the electrolytic cell and used for receiving alkali liquor in the cathode chamber and is externally connected with carbon-rich flue gas; the alkali liquor and the carbon-rich flue gas are contacted with a filler contact layer arranged in the gas-liquid reaction tower to carry out carbon fixation reaction;
the evaporation crystallization tower is arranged at the downstream of the gas-liquid reaction tower and used for receiving the solution after the carbon fixation reaction, and meanwhile, the evaporation crystallization tower is externally connected with low-temperature air to concentrate and crystallize the solution after the carbon fixation reaction.
The electrolytic hydrogen production coupling carbon fixing system for the salt-containing wastewater is characterized in that the electrolytic tank is an ion exchange membrane electrolytic tank; the membrane is a cation exchange membrane.
The brine wastewater electrolysis hydrogen production coupling carbon fixation system is characterized in that a cathode chamber is provided with a brine inlet, an alkali liquor outlet and a hydrogen outlet; the alkali liquor outlet is connected with the gas-liquid reaction tower.
The salt-containing wastewater electrolytic hydrogen production coupling carbon fixing system comprises a gas-liquid reaction tower, a liquid-liquid countercurrent spray tower, a water tank, a filler contact layer and a spray layer, wherein the gas-liquid countercurrent spray tower comprises an alkali liquor inlet, a solution outlet, the water tank is arranged at the inner bottom of the gas-liquid reaction tower, and the middle part of the water tank is provided with the filler contact layer; the liquid in the water collecting tank is circularly sprayed from top to bottom; the alkali liquor inlet is connected with the alkali liquor outlet; the bottom of the water collecting tank is provided with a first gas distribution pipe, and the first gas distribution pipe is externally connected with carbon-rich flue gas.
Preferably, a first gas distribution pipe is also arranged above the liquid level of the water collecting tank.
In the utility model, alkali liquor in a water collecting tank of the gas-liquid reaction tower is circularly sprayed by a circulating water pump, and a first gas distribution pipe is arranged at the bottom of the water collecting tank and above the liquid level.
The salt-containing wastewater electrolytic hydrogen production coupling carbon fixing system is characterized in that the evaporation crystallization tower is a gas-liquid countercurrent spray tower and comprises a solution inlet, a liquid collecting tank arranged at the inner bottom of the evaporation crystallization tower and a spray liquid layer arranged at the upper part of the evaporation crystallization tower; the liquid in the liquid collecting tank is circularly sprayed from top to bottom; the solution inlet is connected with the solution outlet; a second gas distribution pipe is arranged above the liquid level in the liquid collection tank; the second air distribution pipe is externally connected with low-temperature air.
In the utility model, the solution in the liquid collecting tank of the evaporation crystallization tower is circularly sprayed by a circulating water pump.
The brine wastewater electrolytic hydrogen production coupling carbon fixing system also comprises a pretreatment system, wherein the pretreatment system comprises a wastewater inlet, a wastewater outlet and a wastewater impurity removal system; the wastewater outlet is respectively connected with the anode chamber and the cathode chamber; the wastewater inlet is connected with the evaporation crystallization tower.
Wherein, the wastewater outlet in the utility model is connected with the brine inlet on the cathode chamber.
The anode chamber is provided with a brine inlet, a brine outlet and a chlorine outlet; the brine outlet is connected with the wastewater inlet; the waste water outlet is connected with the brine inlet.
The wastewater impurity removal system comprises a coagulating sedimentation tank, a quartz sand filter, an activated carbon filter and an ion exchange resin filter; the salt-containing wastewater is firstly subjected to a coagulating sedimentation tank and a quartz sand filter to remove mixed clots, quartz sand and other particle sediments, then subjected to an activated carbon filter to remove suspended matters and heavy metals, and finally subjected to an ion resin filter to remove calcium, magnesium and partial heavy metal ions.
The salt-containing wastewater electrolytic hydrogen production coupling carbon fixing system is also provided with a concentrated solution outlet and a crystallized salt outlet; the concentrate outlet is connected with the wastewater inlet.
The electrolytic hydrogen production coupling carbon fixing system for the salt-containing wastewater comprises the following steps:
(1) Introducing salt-containing wastewater with the mass percentage of 2-26.5% into an electrolytic tank, generating chlorine gas in an anode chamber, and simultaneously generating Na + Passes through the cation exchange membrane and enters the cathode chamber; hydrogen gas generated in the cathode chamber, and OH - With Na and Na + Forming NaOH solution, and controlling the pH value of the solution to be more than 13;
(2) The NaOH solution is circularly sprayed in a gas-liquid reaction tower, and is subjected to carbon fixation reaction with a filler contact layer and carbon-rich flue gas, and the pH value is controlled to be 7-8 to generate NaHCO 3 Is a solution of (a);
(3)NaHCO 3 the solution is circularly sprayed in an evaporation crystallization tower and is contacted with low-temperature air with the temperature of 50-60 ℃ and the concentration ratio of 2-5 times, naHCO 3 Crystallization and precipitation;
(4) Step (3) NaHCO 3 And refluxing the solution after crystallization to an electrolytic tank.
The salt-containing wastewater is introduced into an electrolytic tank, and the anode chamber reacts as follows:
Cl - -2e - →Cl 2
the cathode chamber reacts as follows:
H + +2e - →H 2
hydrogen generated in cathode chamber of electrolytic tank is collected and utilized, H + OH remaining after electrolysis - Cl - Cannot penetrate the cation exchange membrane into the anode chamber, and therefore, OH - And Na permeating through cation exchange film + Na in electrolyte + NaOH is formed. The carbon dioxide content in the carbon-rich flue gas is 10%, the rest is mainly nitrogen and oxygen, the carbon-rich flue gas enters from a first gas distribution pipe of the gas-liquid reaction tower and contacts with the sprayed NaOH solution in the inner space of the gas-liquid reaction tower and a middle filler contact layer to undergo the following carbon fixation reaction to generate NaHCO 3 Solution:
CO 2 +2NaOH→Na 2 CO 3 +H 2 O
CO 2 +Na 2 CO 3 +H 2 O→2NaHCO 3
NaHCO 3 the solution is circularly sprayed in the evaporation crystallization tower, and low-temperature air with the temperature of 50-60 ℃ enters from a second air distribution pipe of the evaporation crystallization tower and is sprayed with NaHCO 3 The solution is contacted with the space in the tower, and NaHCO 3 The water in the solution is brought out of the evaporation crystallization tower, the solution is gradually concentrated, and NaHCO is obtained 3 And (3) precipitation.
In the utility model, before the salt-containing wastewater with the mass percentage of 2-26.5% is introduced into an electrolytic tank, suspended matters and heavy metals are removed through an activated carbon filter by a pretreatment system, and then calcium, magnesium and heavy metal ions are removed through an ion resin filter; step (4) NaHCO 3 And (5) refluxing the solution after crystallization to the pretreatment system.
Through the technical scheme, the utility model provides a salt-containing wastewater electrolytic hydrogen production coupling carbon fixing system, which has the following technical effects:
(1) The utility model uses the salt-containing wastewater as the electrolytic solution, thereby realizing the treatment and the resource utilization of the wastewater; meanwhile, energy substance hydrogen is generated, and green energy is prepared;
(2) The method utilizes the NaOH solution generated in the electrolysis process to synchronously fix the carbon dioxide in the carbon-rich flue gas, thereby realizing carbon capture;
(3) Crystallization is carried out after carbon fixation reaction, and NaHCO is obtained after separation 3 At the same time, sodium chloride in the solution can be reused for the electrolysis reaction.
Drawings
The foregoing and/or additional aspects and advantages of the utility model will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic diagram of a coupled carbon fixing system for electrolytic hydrogen production from salt-containing wastewater provided in the prior art.
Wherein, the pretreatment system-1, the electrolytic tank-2, the gas-liquid reaction tower-3, the evaporative crystallization tower-4, the carbon-rich flue gas-5, the low-temperature air-6, the chlorine-7 and the hydrogen-8.
Detailed Description
In order that the above-recited objects, features and advantages of the present utility model will be more clearly understood, a more particular description of the utility model will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, without conflict, the embodiments of the present utility model and features in the embodiments may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model, however, the present utility model may be practiced in other ways than those described herein, and therefore the scope of the present utility model is not limited to the specific embodiments disclosed below.
Example 1
As shown in FIG. 1, the embodiment provides a salt-containing wastewater electrolytic hydrogen production coupling carbon fixing system, which comprises
An electrolytic cell 2 in which anode chambers and cathode chambers, and diaphragms isolating the anode chambers and the cathode chambers are alternately arranged;
the gas-liquid reaction tower 3 is arranged at the downstream of the electrolytic tank 2 and used for receiving alkali liquor in the cathode chamber and is externally connected with carbon-rich flue gas 5; the alkali liquor and the carbon-rich flue gas 5 are contacted with a filler contact layer arranged in the gas-liquid reaction tower 3 to carry out carbon fixation reaction;
the evaporation crystallization tower 4 is arranged at the downstream of the gas-liquid reaction tower 3 and is used for receiving the solution after the carbon fixation reaction, and meanwhile, the solution after the carbon fixation reaction is concentrated and crystallized by externally connecting low-temperature air 6.
Wherein the electrolytic tank 2 in the embodiment is an ion exchange membrane electrolytic tank 2; the membrane is a cation exchange membrane.
For further optimizing the embodiment, the cathode chamber is provided with a brine inlet, an alkali liquor outlet and a hydrogen outlet; the alkali liquor outlet is connected with the gas-liquid reaction tower 3.
In order to further optimize the embodiment, the gas-liquid reaction tower 3 is a gas-liquid countercurrent spray tower and comprises an alkali liquor inlet, a solution outlet, a water collecting tank arranged at the inner bottom of the gas-liquid reaction tower 3, a filler contact layer in the middle part and a spray layer in the upper part; the liquid in the water collecting tank is circularly sprayed from top to bottom; the alkali liquor inlet is connected with the alkali liquor outlet; the bottom of the water collecting tank is provided with a first gas distribution pipe, and the first gas distribution pipe is externally connected with carbon-rich flue gas 5.
Preferably, a first gas distribution pipe is also arranged above the liquid level of the water collecting tank.
In the embodiment, alkali liquor in a water collecting tank of the gas-liquid reaction tower 3 is circularly sprayed through a circulating water pump, and a first gas distribution pipe is arranged at the bottom of the water collecting tank and above the liquid level.
In order to further optimize the embodiment, the evaporation crystallization tower 4 is a gas-liquid countercurrent spray tower, and comprises a solution inlet, a liquid collecting tank arranged at the inner bottom of the evaporation crystallization tower 4 and a spray liquid layer arranged at the upper part; the liquid in the liquid collecting tank is circularly sprayed from top to bottom; the solution inlet is connected with the solution outlet; a second gas distribution pipe is arranged above the liquid level in the liquid collection tank; the second air distribution pipe is externally connected with low-temperature air 6.
In this embodiment, the solution in the liquid collecting tank of the evaporative crystallization tower 4 is circulated and sprayed by a circulating water pump.
For further optimizing the embodiment, the carbon fixing system also comprises a pretreatment system 1, wherein the pretreatment system 1 comprises a wastewater inlet, a wastewater outlet and a wastewater impurity removal system; the wastewater outlet is respectively connected with the anode chamber and the cathode chamber; the wastewater inlet is connected with the evaporation crystallization tower 4.
Wherein the wastewater outlet in this embodiment is connected to the brine inlet on the cathode chamber.
For further optimization of the present embodiment, it is proposed that the anode chamber is provided with a brine inlet, a brine outlet and a chlorine outlet; the brine outlet is connected with the wastewater inlet; the waste water outlet is connected with the brine inlet.
The wastewater impurity removal system in the embodiment comprises a coagulating sedimentation tank, a quartz sand filter, an activated carbon filter and an ion exchange resin filter; the salt-containing wastewater is firstly subjected to a coagulating sedimentation tank and a quartz sand filter to remove mixed clots, quartz sand and other particle sediments, then subjected to an activated carbon filter to remove suspended matters and heavy metals, and finally subjected to an ion resin filter to remove calcium, magnesium and partial heavy metal ions.
For further optimization of the present embodiment, it is proposed that the evaporative crystallization tower 4 is also provided with a concentrate outlet and a crystallized salt discharge outlet; the concentrate outlet is connected with the wastewater inlet.
The method for carrying out electrolytic hydrogen production coupling carbon fixation on the salt-containing wastewater by utilizing the system comprises the following steps:
(1) The salt-containing wastewater with the mass percentage of 2 to 26.5 percent is introduced into an electrolytic tank 2, chlorine gas 7 generated in an anode chamber and Na simultaneously + Passes through the cation exchange membrane and enters the cathode chamber; hydrogen 8 generated in the cathode chamber and OH - With Na and Na + Forming NaOH solution, and controlling the pH value of the solution to be more than 13;
(2) The NaOH solution is circularly sprayed in a gas-liquid reaction tower 3, and is subjected to carbon fixation reaction with a filler contact layer and carbon-rich flue gas 5, and the pH value is controlled to be 7-8 to generate NaHCO 3 Is a solution of (a);
(3)NaHCO 3 the solution is circularly sprayed in an evaporation crystallization tower 4 and is contacted with low-temperature air 6 with the temperature of 50-60 ℃ and the concentration ratio is 2-5 times, and NaHCO 3 Crystallization and precipitation;
(4) Step (3) NaHCO 3 The solution after crystallization is refluxed to the electrolytic tank 2.
For the convenience of understanding the method in this embodiment, the salt-containing wastewater in this embodiment is introduced into the electrolytic cell 2, and the following reaction occurs in the anode chamber:
Cl - -2e - →Cl 2
the cathode chamber reacts as follows:
H + +2e - →H 2
the hydrogen 8 generated in the cathode chamber of the electrolytic tank 2 is collected and utilized, H + OH remaining after electrolysis - Cl - Cannot penetrate the cation exchange membrane into the anode chamber, and therefore, OH - And Na permeating through cation exchange film + Na in electrolyte + NaOH is formed. The carbon-rich flue gas 5 enters from the first gas distribution pipe of the gas-liquid reaction tower 3, contacts with the sprayed NaOH solution in the inner space of the gas-liquid reaction tower 3 and the middle filler contact layer, and generates the following carbon fixation reaction to generate NaHCO 3 Solution:
CO 2 +2NaOH→Na 2 CO 3 +H 2 O
CO 2 +Na 2 CO 3 +H 2 O→2NaHCO 3
NaHCO 3 the solution is circularly sprayed in the evaporation crystallization tower 4, and low-temperature air 6 with the temperature of 50-60 ℃ enters from a second air distribution pipe of the evaporation crystallization tower 4 and is sprayed with NaHCO 3 The solution is contacted with the space in the tower, and NaHCO 3 The water in the solution is brought out of the evaporation crystallization tower 4, the solution is gradually concentrated, and NaHCO is obtained 3 And (3) precipitation.
In order to further optimize the embodiment, before the salt-containing wastewater with the mass percent of 2-26.5% is introduced into the electrolytic tank 2, suspended matters and heavy metals are removed through an activated carbon filter by the pretreatment system 1, and then calcium, magnesium and heavy metal ions are removed through an ion resin filter; step (4) NaHCO 3 The solution after crystallization is refluxed to the pretreatment system 1.
The embodiment specifically comprises the following steps: salt-containing wastewater with the mass percentage of 2-26.5% is selected from 2%, particle precipitates such as mixed clots and quartz sand in the salt-containing wastewater are removed through a coagulating sedimentation tank and a quartz sand filter by a pretreatment system 1, suspended matters and heavy metals are removed through an activated carbon filter, calcium, magnesium and partial heavy metal ions are removed through an ion resin filter, and the salt-containing wastewater is introduced into a salt water inlet of an anode chamber and a salt water inlet of a cathode chamber of an electrolytic tank 2 through a wastewater outlet to carry out electrolytic hydrogen production, wherein the anode chamber carries out the following reaction: cl - -2e - →Cl 2 The method comprises the steps of carrying out a first treatment on the surface of the The cathode chamber reacts as follows: h + +2e - →H 2 The method comprises the steps of carrying out a first treatment on the surface of the Na of anode chamber under the action of electric field + Entering a cathode chamber through a cation exchange membrane; OH of cathode Chamber - Cl - Cannot penetrate the cation exchange membrane to enter the anode chamber, OH - And Na permeating through cation exchange film + Na in electrolyte + A NaOH solution is formed, the NaOH solution having a pH greater than 13. The salt solution in the anode chamber of the electrolytic cell 2 is returned to the wastewater inlet of the pretreatment system 1 through the brine outlet.
NaOH solution in a cathode chamber of the electrolytic tank 2 is connected with an alkali liquor inlet of the gas-liquid reaction tower 3 through an alkali liquor outlet and discharged to a water collecting tank, and is sprayed downwards from a spraying layer at the upper part in the tower through a circulating water pump; the carbon-rich flue gas 5 enters from a first gas distribution pipe of the gas-liquid reaction tower 3, contacts with the sprayed NaOH solution in the space and the middle filler contact layer in the tower, and carries out carbon fixation reaction, the pH is controlled to be 7-8, preferably 8.0, and NaHCO is generated 3 A solution; naHCO after carbon fixation reaction 3 The solution enters a solution inlet of the evaporation crystallization tower 4 through a solution outlet, and is sprayed downwards from a spraying layer at the upper part in the tower through a circulating water pump; low temperature air 6 of 50-60 ℃ in this example, low temperature air 6 of 50 ℃ is selected to enter from the second air distribution pipe of the evaporative crystallization tower 4 and spray NaHCO 3 The solution is contacted with the space in the tower, and NaHCO 3 The water in the solution is brought out of the evaporation crystallization tower 4, the solution is gradually concentrated, the concentration ratio is 2-5 times, and the concentration ratio of the embodiment is 3 times and NaHCO is favorable 3 The crystallization is discharged from a crystallization salt discharge outlet at the bottom, and the remaining solution is returned to the wastewater inlet of the pretreatment system 1 through a concentrate outlet.
The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (8)
1. The electrolytic hydrogen production coupling carbon fixing system for the salt-containing wastewater is characterized by comprising an electrolytic tank, anode chambers and cathode chambers which are alternately arranged in the electrolytic tank, and a diaphragm for isolating the anode chambers and the cathode chambers;
the gas-liquid reaction tower is arranged at the downstream of the electrolytic cell and used for receiving alkali liquor in the cathode chamber and is externally connected with carbon-rich flue gas; the alkali liquor and the carbon-rich flue gas are contacted with a filler contact layer arranged in the gas-liquid reaction tower to carry out carbon fixation reaction;
the evaporation crystallization tower is arranged at the downstream of the gas-liquid reaction tower and used for receiving the solution after the carbon fixation reaction, and meanwhile, the evaporation crystallization tower is externally connected with low-temperature air to enable the solution after the carbon fixation reaction to be concentrated and crystallized.
2. The system of claim 1, wherein the electrolyzer is an ion exchange membrane electrolyzer; the membrane is a cation exchange membrane.
3. The system of claim 1, wherein the cathode chamber is provided with a brine inlet, a lye outlet, and a hydrogen outlet; the alkali liquor outlet is connected with the gas-liquid reaction tower.
4. The system according to claim 3, wherein the gas-liquid reaction tower is a gas-liquid countercurrent spray tower comprising an alkali liquor inlet, a solution outlet, a water collecting tank arranged at the inner bottom of the gas-liquid reaction tower, a packing contact layer in the middle part and a spray layer in the upper part; the liquid in the water collecting tank is circularly sprayed from top to bottom; the alkali liquor inlet is connected with the alkali liquor outlet; the bottom of the water collecting tank is provided with a first gas distribution pipe, and the first gas distribution pipe is externally connected with carbon-rich flue gas.
5. The system according to claim 4, wherein the evaporative crystallization tower is a gas-liquid countercurrent spray tower comprising a solution inlet, a liquid collecting tank arranged at the inner bottom of the evaporative crystallization tower, and a spray liquid layer arranged at the upper part; the liquid in the liquid collecting tank is circularly sprayed from top to bottom; the solution inlet is connected with the solution outlet; a second gas distribution pipe is arranged above the liquid level in the liquid collection tank; the second air distribution pipe is externally connected with low-temperature air.
6. The system of any one of claims 1-5, wherein the carbon sequestration system further comprises a pretreatment system comprising a wastewater inlet, a wastewater outlet, and a wastewater removal system; the wastewater outlet is respectively connected with the anode chamber and the cathode chamber; and the wastewater inlet is connected with the evaporation crystallization tower.
7. The system of claim 6, wherein the anode compartment is provided with a brine inlet, a brine outlet, and a chlorine outlet; the brine outlet is connected with the wastewater inlet; the wastewater outlet is connected with the brine inlet.
8. The system of claim 6, wherein the evaporative crystallization tower is further provided with a concentrate outlet and a crystallized salt discharge outlet; the concentrate outlet is connected with the wastewater inlet.
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