CN-224212440-U - Negative pressure low-temperature evaporation and desalination strong brine system by coupling waste heat of electrolytic tank

CN224212440UCN 224212440 UCN224212440 UCN 224212440UCN-224212440-U

Abstract

The utility model discloses a coupling electrolytic tank waste heat negative pressure low-temperature evaporation desalination strong brine system which comprises a reboiler, a venturi structure, a condenser, a brine tank and a condensate tank, wherein the reboiler is provided with an alkali liquor heat exchange inlet pipe and an alkali liquor heat exchange outlet pipe, the venturi structure is respectively communicated with the reboiler and the condenser, a strong brine preheating pipe is connected between the condenser and the brine tank, the condenser is connected with the reboiler through the strong brine evaporating pipe, a first booster pump is arranged on the strong brine preheating pipe, a condensate circulating pipe is connected between the condensate tank and the venturi structure, and a second booster pump is arranged on the condensate circulating pipe. The utility model can utilize the waste heat generated by the operation of the electrolytic tank as a heat source for evaporating the strong brine, reduce the boiling and evaporating temperature of the strong brine through the Venturi structure, reduce the energy required for heating the strong brine to the evaporating temperature, further reduce the consumption of additional energy and reduce the production cost.

Inventors

LV GUOAI
CHEN YOUXIAO
LIU XIAOHAN
WU XINGBING
YAN MI

Assignees

中集集电(广东)科技发展有限公司
中集海洋工程有限公司

Dates

Publication Date: 20260508
Application Date: 20250414

Claims (10)

1. The utility model provides a coupling electrolysis trough waste heat negative pressure low temperature evaporation desalination strong brine system, its characterized in that, including reboiler, venturi structure, condenser, brine tank and condensate tank, the reboiler is provided with alkali lye heat exchange feed-in pipe and alkali lye heat exchange exit tube, alkali lye heat exchange feed-in pipe with the liquid outlet and the inlet of electrolysis trough are connected respectively to the alkali lye heat exchange exit tube, venturi structure communicates respectively the reboiler with the condenser, the condenser with be connected with strong brine preheating pipe between the brine tank, the condenser passes through strong brine evaporating pipe and connects the reboiler, be provided with first booster pump on the strong brine preheating pipe, the condensate tank with be connected with the condensate circulation pipe between the venturi structure, be provided with the second booster pump on the condensate circulation pipe.
2. The negative pressure low-temperature evaporation desalinization strong brine system based on the waste heat of the coupling electrolytic tank according to claim 1, wherein the venturi structure comprises a hollow pipe, a nozzle arranged at one end of the hollow pipe, a reducing pipe and a reducing pipe sequentially connected with the other end of the hollow pipe, and a negative pressure air suction pipe connected with the bottom of the hollow pipe, the nozzle is connected with the condensed water circulating pipe, the reducing pipe is connected with the condenser, and the negative pressure air suction pipe is connected with the reboiler.
3. The system for negative pressure low-temperature evaporation desalination of strong brine by coupling waste heat of an electrolytic cell according to claim 2, wherein the nozzle, the hollow tube, the reducer and the reducer are coaxially arranged.
4. The negative pressure low-temperature evaporation desalinated strong brine system based on the waste heat of the coupling electrolytic tank as claimed in claim 1, wherein the condenser is provided with a reflux interface, the reflux interface is connected with the condensate water tank through a condensate water reflux pipe, and the condensate water reflux pipe is provided with a condensate water valve.
5. The negative pressure low-temperature evaporation desalinated strong brine system with waste heat of the coupling electrolytic tank as claimed in claim 1, wherein a temperature sensor and a pressure sensor are arranged on the reboiler.
6. The negative pressure low-temperature evaporation desalinated strong brine system with waste heat of the coupling electrolytic tank according to claim 1, wherein a liquid level meter is further arranged on the reboiler, the liquid level meter is connected to the reboiler through two liquid level connecting flanges, and the two liquid level connecting flanges are respectively located above and below the side part of the reboiler.
7. The negative pressure low-temperature evaporation desalinated strong brine system based on the waste heat of the coupling electrolytic tank as claimed in claim 1, wherein a sewage draining interface is arranged at the bottom of the reboiler, the sewage draining interface is connected with the brine tank through a sewage draining pipe, and a sewage draining valve is arranged on the sewage draining pipe.
8. The system for negative pressure low-temperature evaporation desalination of strong brine by coupling waste heat of an electrolytic tank according to claim 1, wherein a check valve and a strong brine valve are arranged on the strong brine evaporation pipe.
9. The system for negative pressure low-temperature evaporation desalination of strong brine by coupling waste heat of an electrolytic tank according to claim 1, wherein a flowmeter is further arranged on the strong brine evaporation tube.
10. The system for negative pressure low temperature evaporation desalination of strong brine by coupling waste heat of electrolytic tank as claimed in claim 1, wherein said reboiler is an axe type reboiler.

Description

Negative pressure low-temperature evaporation and desalination strong brine system by coupling waste heat of electrolytic tank Technical Field The utility model relates to the technical field of brine desalination, in particular to a negative pressure low-temperature evaporation and desalination strong brine system by coupling waste heat of an electrolytic cell. Background The whole world has 97% of water as brine and only 3% of water as fresh water, wherein 2.5% of fresh water is covered by glaciers, mountains or other permanent frozen soil, and the available fresh water only accounts for 0.3% of the total amount of the whole world, so that fresh water resources are precious. Alkaline electrolysis technology is the most mature and widely applied technology in the field of electrolytic water at present. The basic principle of hydrogen production is that under the action of current, water is decomposed into hydrogen and oxygen through electrochemical reaction, and then the hydrogen and the oxygen are separated out at the cathode and the anode of an electrolytic cell respectively. During the water electrolysis process, the raw water is decomposed and gradually consumed, and basically 0.9 liter of raw water is consumed per unit volume of hydrogen gas produced, and in order to maintain continuous production, the raw water is required to be continuously replenished into the system. Because the hydrogen production requirement and scale of the electrolytic tank are continuously enlarged, the consumption of raw water is higher and higher, and meanwhile, the total amount of waste heat generated in the hydrogen production process by electrolyzing water is considerable. In order to utilize the brine, the prior art is to exchange energy for fresh water through a brine desalination technology, and the energy mainly required by brine desalination comprises heat energy and electric energy. Wherein, at normal pressure, the heat energy is used for heating the strong brine to boil and evaporate, the water vapor is condensed by a condenser to be converted into fresh water, and the electric energy is used for supplying power to a water pump, a brine pump, a vacuum pump and the like in the equipment. However, the existing strong brine conversation equipment requires high energy consumption and high cost. Disclosure of utility model In order to overcome the defects of the prior art, the utility model provides a negative pressure low-temperature evaporation desalination strong brine system by coupling the waste heat of an electrolytic tank, which can utilize the waste heat generated by the work of the electrolytic tank as a heat source for the evaporation of the strong brine, reduce the boiling evaporation temperature of the strong brine through a Venturi structure, reduce the energy required for heating the strong brine to the evaporation temperature, further reduce the consumption of additional energy and reduce the production cost. The technical scheme adopted for solving the technical problems is as follows: The utility model provides a coupling electrolysis trough waste heat negative pressure low temperature evaporation desalination strong brine system, includes reboiler, venturi structure, condenser, brine tank and condensate tank, the reboiler is provided with alkali lye heat exchange feed-in pipe and alkali lye heat exchange exit tube, alkali lye heat exchange feed-in pipe with the liquid outlet and the inlet of electrolysis trough are connected respectively to the alkali lye heat exchange exit tube, venturi structure communicates respectively the reboiler with the condenser, the condenser with be connected with strong brine preheating pipe between the brine tank, the condenser passes through strong brine evaporating pipe and connects the reboiler, be provided with first booster pump on the strong brine preheating pipe, the condensate tank with be connected with the condensate circulation pipe between the venturi structure, be provided with the second booster pump on the condensate circulation pipe. As a further improvement of the technical scheme, the venturi structure comprises a hollow pipe, a nozzle arranged at one end of the hollow pipe, a reducing pipe and a reducing pipe which are sequentially connected with the other end of the hollow pipe, and a negative pressure air suction pipe connected with the bottom of the hollow pipe, wherein the nozzle is connected with the condensate water circulating pipe, the reducing pipe is connected with the condenser, and the negative pressure air suction pipe is connected with the reboiler. As a further improvement of the technical scheme, the nozzle, the hollow tube, the reducing tube and the diverging tube are coaxially arranged. As a further improvement of the technical scheme, the condenser is provided with a reflux interface, the reflux interface is connected with the condensate water tank through a condensate water reflux pipe, and the condensate water reflux pipe is provide