CN-122013215-A - Integrated reverse electrodialysis seawater hydrogen production system and operation method thereof

CN122013215ACN 122013215 ACN122013215 ACN 122013215ACN-122013215-A

Abstract

The invention discloses an integrated reverse electrodialysis seawater hydrogen production system and an operation method thereof, wherein the system comprises an alkaline hydrogen production electrolytic tank, an alkaline circulating outlet of the alkaline hydrogen production electrolytic tank is communicated with a high-concentration chamber of a multistage reverse electrodialysis device, the multistage reverse electrodialysis device comprises a concentration difference power generation module formed by stacking at least three stages of electrodialysis cell pile units, electric energy output ends of the multistage reverse electrodialysis device are respectively connected to the alkaline hydrogen production electrolytic tank and a driving part of an on-line seawater desalination device, electric energy is generated by driving ion migration by utilizing concentration differences between concentrated alkaline liquid and dilute alkaline liquid, the on-line seawater desalination device is of an alkaline liquid regeneration type osmosis structure, pure water separation is realized by utilizing osmotic pressure differences, and a desalted water outlet of the multistage reverse electrodialysis device is respectively communicated with a water supplementing port of the alkaline hydrogen production electrolytic tank and a low-concentration chamber of the multistage reverse electrodialysis device. The invention has the advantages of simplified structure, realization of cooperative closed-loop operation of concentration power generation, electrolysis waste heat recovery and on-line sea water desalination, realization of energy cascade utilization and material closed-loop, and reduction of hydrogen production energy consumption.

Inventors

XIA YANGHONG
MA DONGCHEN
WANG XIONGZHENG
ZHONG QIMING
WEI WEI

Assignees

浙江大学
东海实验室

Dates

Publication Date: 20260512
Application Date: 20260410

Claims (10)

1. An integrated reverse electrodialysis seawater hydrogen production system, comprising: An alkaline hydrogen production electrolytic tank (1); The multistage reverse electrodialysis device comprises a concentration difference power generation module formed by stacking at least three stages of electrodialysis cell pile units (2), wherein the concentration difference power generation module drives ion migration to generate electric energy by utilizing concentration difference between concentrated alkali liquor and dilute alkali liquor; The online sea water desalting device (3), the online sea water desalting device (3) is an alkali liquor regeneration type permeation structure, and pure water separation is realized by utilizing a permeation pressure difference to obtain desalted water; the electric energy output end of the concentration difference power generation module is respectively connected to the alkali liquid hydrogen production electrolytic tank (1) and the driving part of the online sea water desalination device (3) so as to provide electric energy for the same; an alkali liquor circulation outlet (12) of the alkali liquor hydrogen production electrolytic tank (1) is communicated with a high-concentration chamber (21) of the multistage reverse electrodialysis device; The desalted water outlet (31) of the online sea water desalting device (3) is respectively communicated with the water supplementing port (11) of the alkali liquid hydrogen production electrolytic tank (1) and the low-concentration chamber (22) of the multistage reverse electrodialysis device; the mixed solution outlet (212) of the multistage reverse electrodialysis device is communicated with the mixed solution inlet (32) of the online sea water desalination device (3).
2. The integrated reverse electrodialysis seawater hydrogen production system according to claim 1, wherein the multistage reverse electrodialysis device is provided with a high concentration chamber inlet (211) and a low concentration chamber inlet (221) for introducing concentrated lye and dilute lye, respectively, and is provided with a mixed liquor outlet (212) for discharging the mixed lye after ion exchange and refluxing to the online seawater desalination device (3).
3. The integrated reverse electrodialysis seawater hydrogen production system according to claim 1, wherein in the concentration difference power generation module, an electric energy output end of a previous electrodialysis cell stack unit (2) is connected with an electric energy input end of a next electrodialysis cell stack unit (2), an electric energy input end of a first electrodialysis cell stack unit (2) serving as an electric energy input end of the concentration difference power generation module is electrically connected with an alkaline solution hydrogen production electrolytic tank (1) and an online seawater desalination device (3), and an electric energy output end of a last electrodialysis cell stack unit (2) serving as an electric energy output end of the concentration difference power generation module.
4. Integrated reverse electrodialysis seawater hydrogen production system according to claim 1, characterized in that the electrodialysis cell stack unit (2) comprises a number of anion exchange membranes (24) stacked alternately with a number of cation exchange membranes (23), both sides of the cation exchange membranes (23) and anion exchange membranes (24) being supported by polyethylene terephthalate mesh to form flow chambers; An anode (25) and a cathode (26) are arranged on two sides of the inside of the electrodialysis cell stack unit (2), and electrode liquid is filled in a chamber where the anode (25) and the cathode (26) are located.
5. The integrated reverse electrodialysis sea water hydrogen production system according to claim 4, wherein the cation exchange membrane (23) is a perfluorosulfonic acid type cation exchange membrane, the anion exchange membrane (24) is a quaternary ammonium type anion exchange membrane, and the membrane thicknesses of both membranes are 20 μm; the thickness of the flow chamber is 0.3mm; The flow chamber comprises a high concentration chamber (21) and a low concentration chamber (22), wherein the high concentration chamber (21) and the low concentration chamber (22) are distributed in a staggered way; the anode (25) is adjacent to the anion exchange membrane (24) and the cathode (26) is adjacent to the cation exchange membrane (23).
6. The integrated reverse electrodialysis seawater hydrogen production system according to claim 1, wherein the online seawater desalination device (3) comprises a cylindrical barrel main body (33), a hydrophobic porous membrane assembly (34), an outer metal shell (35) and a liquid level valve (36), wherein the hydrophobic porous membrane assembly (34) is wrapped on the outer side of the cylindrical barrel main body (33) and fixed through an iron ring, the outer metal shell (35) is movably sleeved on the outer side of the hydrophobic porous membrane assembly (34), a rubber pad is arranged between the outer metal shell (35) and the hydrophobic porous membrane assembly (34) to form a sealing space, and the liquid level valve (36) is connected with the outer metal shell (35) and is used for controlling movement of the outer metal shell (35) so as to adjust the effective contact area of the hydrophobic porous membrane assembly (34) and seawater.
7. The integrated reverse electrodialysis sea water hydrogen production system according to claim 6, wherein the hydrophobic porous membrane module (34) is a polytetrafluoroethylene-based membrane having a pore size of 0.1 μm.
8. The integrated reverse electrodialysis seawater hydrogen production system according to claim 6, wherein the liquid level valve (36) is in linkage with the outer metal casing (35): when the liquid level in the online sea water desalting device (3) is lower than a preset value, the liquid level valve (36) drives the outer metal shell (35) to move so as to increase the exchange area of the hydrophobic porous membrane component (34) and sea water; When the liquid level in the online sea water desalting device (3) is higher than a preset value, the liquid level valve (36) drives the outer metal shell (35) to move so as to reduce the exchange area of the hydrophobic porous membrane component (34) and sea water.
9. The integrated reverse electrodialysis seawater hydrogen production system according to claim 1, wherein a heat exchange pipeline is arranged between the alkali liquid hydrogen production electrolytic tank (1) and the multistage reverse electrodialysis device, and the heat exchange pipeline is used for transferring waste heat generated by the operation of the alkali liquid hydrogen production electrolytic tank (1) to the multistage reverse electrodialysis device so as to assist in maintaining the operation temperature of the electrodialysis cell stack unit (2) at 30-40 ℃; The electric energy output by the concentration difference power generation module is preferably supplied to 10% -20% of the energy consumption of the alkaline liquid hydrogen production electrolytic tank (1), and the residual electric energy is supplied to a driving part of the online sea water desalination device (3).
10. A method of operating an integrated reverse electrodialysis seawater hydrogen production system as claimed in any one of claims 1 to 9, comprising the steps of: S1, seawater is subjected to quartz sand filtration pretreatment and then is contacted with a hydrophobic porous membrane component (34) of an online seawater desalination device (3), a liquid level valve (36) controls an outer metal shell (35) to move according to the liquid level in the online seawater desalination device (3), pure water in the seawater is driven to permeate the hydrophobic porous membrane component (34) to form desalted water through osmotic pressure difference, the desalted water is respectively conveyed to an alkaline hydrogen production electrolytic tank (1) for water supplementing, and a low-concentration chamber (22) of a multistage reverse electrodialysis device is used as dilute alkali solution; s2, electrifying an alkali liquor hydrogen production electrolytic tank (1) to electrolyze alkali liquor to generate hydrogen, conveying concentrated alkali liquor formed after electrolysis to a high-concentration chamber (21) of a multistage reverse electrodialysis device, indirectly transferring waste heat released in the process to an electrodialysis cell stack unit (2) of the multistage reverse electrodialysis device through a heat exchange pipeline, and assisting in maintaining the operation temperature of the electrodialysis cell stack unit; s3, driving ion migration to generate electric energy by utilizing concentration difference between concentrated alkali liquor and dilute alkali liquor by the multistage reverse electrodialysis device, and supplying the electric energy to driving components of the alkali liquor hydrogen production electrolytic tank (1) and the online sea water desalination device (3); s4, delivering the mixed solution subjected to multistage reverse electrodialysis ion exchange into an online sea water desalting device (3) through a mixed solution inlet (32).

Description

Integrated reverse electrodialysis seawater hydrogen production system and operation method thereof Technical Field The invention belongs to the technical field of seawater electrolysis hydrogen production in the field of new energy, and particularly relates to an integrated reverse electrodialysis seawater hydrogen production system and an operation method thereof. Background The seawater hydrogen production is taken as an important direction of green hydrogen production, and can get rid of dependence on fresh water, but the problems of complex flow and high energy consumption in the traditional technology are that firstly, the electrolytic hydrogen production is high in energy consumption, the concentration difference in the hydrogen production link is not fully utilized to reduce the energy consumption, secondly, the desalination of the seawater is mostly carried out by adopting energy consumption modes such as membrane distillation, the natural driving force of the osmotic pressure difference is not fully utilized, and thirdly, the electrolytic waste heat is not effectively utilized, so that the energy waste is caused. Aiming at the defects, the invention provides a seawater hydrogen production system capable of reducing energy consumption, which realizes concentration power generation by adopting reverse electrodialysis (Reverse Electrodialysis, RED) technology, reduces the energy consumption of the seawater hydrogen production system, realizes pure water supplementation without additional energy consumption by utilizing an online seawater desalination technology, supplies the RED system with electrolytic waste heat, saves a heating structure while improving efficiency, and supports the reduction of the production cost of integral green hydrogen. Disclosure of Invention The invention aims at overcoming the defects of the prior art and provides an integrated reverse electrodialysis seawater hydrogen production system and an operation method thereof. The invention aims at realizing the following technical scheme that the first aspect of the embodiment of the invention provides an integrated reverse electrodialysis seawater hydrogen production system, which comprises: An electrolytic tank for producing hydrogen by alkali liquor; the multistage reverse electrodialysis device comprises a concentration difference power generation module formed by stacking at least three stages of electrodialysis cell stack units, wherein the concentration difference power generation module drives ion migration to generate electric energy by utilizing concentration difference between concentrated alkali liquor and dilute alkali liquor; The online seawater desalination device is of an alkali liquor regeneration type permeation structure, and pure water separation is realized by utilizing a permeation pressure difference to obtain desalted water; The electric energy output end of the concentration difference power generation module is respectively connected to the alkali liquid hydrogen production electrolytic tank and the driving part of the online sea water desalination device so as to provide electric energy for the alkali liquid hydrogen production electrolytic tank and the online sea water desalination device; An alkali liquor circulation outlet of the alkali liquor hydrogen production electrolytic tank is communicated with a high-concentration chamber of the multistage reverse electrodialysis device; The desalted water outlet of the online sea water desalting device is respectively communicated with the water supplementing port of the alkali liquid hydrogen production electrolytic tank and the low-concentration chamber of the multistage reverse electrodialysis device; and the mixed solution outlet of the multistage reverse electrodialysis device is communicated with the mixed solution inlet of the online sea water desalination device. The multistage reverse electrodialysis device is provided with a mixed liquor outlet for discharging the mixed liquor after ion exchange and refluxing the mixed liquor to the on-line sea water desalination device. Further, in the concentration difference power generation module, the electric energy output end of the previous electrodialysis cell stack unit is connected with the electric energy input end of the next electrodialysis cell stack unit, the electric energy input end of the first electrodialysis cell stack unit serving as the electric energy input end of the concentration difference power generation module is electrically connected with the alkaline hydrogen production electrolysis tank and the on-line sea water desalination device, and the electric energy output end of the last electrodialysis cell stack unit serving as the electric energy output end of the concentration difference power generation module. Further, the electrodialysis cell stack unit comprises a plurality of anion exchange membranes and a plurality of cation exchange membranes which are alternately stacked, wherei