Hot water heat tracing temperature maintaining system for hydrogen production shutdown of alkaline water electrolytic tank
By installing a hot water tracing system outside the alkaline water electrolyzer, the problem of temperature fluctuations caused by frequent start-ups and shutdowns was solved, achieving temperature stability and safety of the electrolyzer and extending the equipment's lifespan.
Patent Information
- Application Number
- CN202520120674.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-20
- Publication Date
- 2025-12-12
- Estimated Expiration
- 2035-01-20
AI Technical Summary
Existing alkaline water electrolysis hydrogen production equipment suffers from large temperature fluctuations due to frequent start-ups and shutdowns, leading to gasket damage and alkaline leakage, which affects equipment safety and lifespan.
A hot water tracing system is used to maintain the temperature of the electrolytic cell when it is shut down. This is achieved by installing a flexible, insulated, high-temperature resistant hot water tracing coil outside the electrolytic cell, which prevents thermal expansion and contraction.
It effectively avoids the problem of thermal expansion and contraction caused by temperature changes due to frequent start-stop, extends the service life of the electrolytic cell, and prevents alkali leakage.
Smart Images
Figure CN223660246U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to electrolytic water hydrogen production technical field, concretely relates to a kind of hot water heat tracing temperature maintenance system of alkaline water electrolytic cell hydrogen production shutdown. BACKGROUND
[0002] The existing alkaline water electrolysis hydrogen production equipment, especially the green electricity hydrogen production scene such as photovoltaic and wind power generation, due to the characteristics of green electricity load fluctuation, electrolytic cell is in a large range of load fluctuation, frequent start-stop and other unstable state under the operation of daytime start-up, night shutdown, frequent start-stop causes the temperature change of electrolytic cell itself to be larger, so that electrolytic cell is easily damaged due to thermal expansion and cold shrinkage, causing alkali leakage and other problems, affecting the safety and service life of electrolytic cell. For the above problems, how to eliminate the temperature change caused by frequent start-stop of electrolytic cell, which causes thermal expansion and cold shrinkage of gasket damage and alkali leakage, has become one of the important research topics. SUMMARY
[0003] The utility model aims at overcoming the above-mentioned insufficient, provides a kind of hot water heat tracing temperature maintenance system of alkaline water electrolytic cell hydrogen production shutdown, ensure that the temperature in electrolytic cell is equivalent to operating condition when shutdown, avoid the serious problem of thermal expansion and cold shrinkage gasket damage caused by temperature change of electrolytic cell due to frequent start-stop.
[0004] The utility model aims at overcoming the above-mentioned insufficient, provides a kind of hot water heat tracing temperature maintenance system of alkaline water electrolytic cell hydrogen production shutdown, ensure that the temperature in electrolytic cell is equivalent to operating condition when shutdown, avoid the serious problem of thermal expansion and cold shrinkage gasket damage caused by temperature change of electrolytic cell due to frequent start-stop.
[0005] A kind of hot water heat tracing temperature maintenance system of alkaline water electrolytic cell hydrogen production shutdown, including electrolytic cell, hydrogen separator, oxygen separator and alkali cooler, the hydrogen side outlet of electrolytic cell is connected hydrogen separator, oxygen side outlet is connected oxygen separator, the alkali outlet of hydrogen separator, the alkali outlet of oxygen separator is connected alkali cooler simultaneously, the alkali cooler is connected electrolytic cell by alkali circulation pump, electrolytic cell is equipped with hot water heat tracing coil pipe, the hot water heat tracing coil pipe uses bendable insulating high-temperature resistant material, the hot water inlet of hot water heat tracing coil pipe is equipped with hot water flow regulating valve.
[0006] Preferably, the hot water inlet and outlet of the hot water heat tracing coil pipe are arranged on the negative side of the electrolytic cell.
[0007] Preferably, the front and back of the electrolytic cell are respectively provided with hot water heat tracing coil pipes, and one or multiple hot water heat tracing coil pipes form a continuous and circuitous multi-travel snake-shaped structure on the front and back of the electrolytic cell.
[0008] Preferably, the hot water inlet of the hot water heat tracing coil pipe is located at the upper part of the electrolytic cell, and the hot water outlet is located at the lower part of the electrolytic cell.
[0009] Preferably, the hot water inlet temperature of the hot water heat tracing coil adopts medium temperature hot water of 80-85 DEG C, and the hot water outlet temperature is controlled at 70-75 DEG C.
[0010] Preferably, the electrolytic cell is connected with the hydrogen separator and the oxygen separator through the first alkali pipeline and the second alkali pipeline respectively, the alkali outlet of the hydrogen separator and the alkali outlet of the oxygen separator are connected with the alkali cooler through the third alkali pipeline and the fourth alkali pipeline respectively, the alkali cooler is connected with the electrolytic cell through the fifth alkali pipeline, and the alkali circulating pump is arranged on the fifth alkali pipeline, and the alkali pipelines are externally spirally provided with hot water heat tracing coils.
[0011] The hydrogen separator and the oxygen separator are also externally provided with hot water heat tracing coils.
[0012] Preferably, when the electrolytic cell is stopped, the hot water flow regulating valve is opened, and the alkali circulating pump is closed; when the electrolytic cell is operated, the hot water flow regulating valve is closed, and the alkali circulating pump is opened.
[0013] The utility model discloses the beneficial effect is:
[0014] The hot water heat tracing coil with heat tracing and heat preservation function is arranged outside the electrolytic cell, the whole temperature of the electrolytic cell is guaranteed to be equivalent to the operating condition through hot water shutdown heat tracing, the thermal expansion and cold shrink problem caused by temperature change due to frequent start and stop of the electrolytic cell can be eliminated, the temperature maintaining hot water heat tracing system is started when the electrolytic cell is stopped, and is closed when the electrolytic cell is operated.
[0015] The alkali circulating pump in the hydrogen production system does not need to be operated, and the alkali system stops circulating under the premise that the temperature of the whole alkali system is maintained to be equivalent to the operating condition when the electrolytic cell is stopped, so that the problem of rising of hydrogen in oxygen and oxygen in hydrogen indexes caused by solubility due to alkali circulation can be avoided. BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1 It is a structure schematic view of the hot water heat tracing temperature maintaining system of the alkaline water electrolytic cell hydrogen production shutdown.
[0017] Figure 2 It is a structure schematic view of the electrolytic cell.
[0018] Figure 3 It is Figure 2 It is the left view.
[0019] Among them: electrolytic cell 1, hydrogen separator 2, oxygen separator 3, alkali cooler 4, alkali circulating pump 5, hot water heat tracing coil 6, hot water flow regulating valve 7, hydrogen scrubber 8, oxygen scrubber 9, hydrogen cooler 10, oxygen cooler 11. PREFERRED EMBODIMENT
[0020] See Figures 1-3 This utility model relates to a hot water tracing and temperature maintenance system for hydrogen production shutdown in an alkaline water electrolyzer, comprising an electrolyzer 1, a hydrogen separator 2, an oxygen separator 3, an alkaline cooler 4, a hydrogen scrubber 8, an oxygen scrubber 9, a hydrogen cooler 10, and an oxygen cooler 11. The hydrogen-side outlet of the electrolyzer 1 is connected to the hydrogen separator 2, and the oxygen-side outlet is connected to the oxygen separator 3. The alkaline outlets of the hydrogen separator 2 and the oxygen separator 3 are simultaneously connected to the alkaline cooler 4. The alkaline cooler 4 is connected to the electrolyzer 1 via an alkaline circulation pump 5. A hot water tracing coil 6 is provided outside the electrolyzer 1. The hot water tracing coil 6 is made of a flexible, insulating, high-temperature resistant material, such as PP. The hot water inlet and outlet of the hot water tracing coil 6 are both located in the electrolyzer 1. The hot water inlet is located on the negative electrode side of the electrolytic cell 1, and the hot water outlet is located on the lower part of the electrolytic cell 1. The front and back of the electrolytic cell 1 are respectively equipped with hot water tracing coils 6. One or multiple hot water tracing coils 6 form a continuous, meandering, multi-stroke serpentine structure on the front and back of the electrolytic cell. The hot water inlet of the hot water tracing coil 6 is equipped with a hot water flow regulating valve 7. The hot water inlet temperature is 80~85℃ (or higher temperature hot water), and the hot water outlet temperature is controlled at 70~75℃. By using hot water to traverse the electrolytic cell when it is shut down, the overall temperature of the electrolytic cell is ensured to be the same as the operating condition. This can eliminate the problem of thermal expansion and contraction caused by temperature changes due to frequent start-up and shutdown of the electrolytic cell. The hot water tracing temperature maintenance system is activated when the electrolytic cell is shut down and deactivated when the electrolytic cell is running.
[0021] The electrolytic cell 1 is connected to the hydrogen separator 2 and the oxygen separator 3 respectively through the first alkali pipe and the second alkali pipe. The alkali outlet of the hydrogen separator 2 and the alkali outlet of the oxygen separator 3 are connected to the alkali cooler 4 through the third alkali pipe and the fourth alkali pipe respectively. The alkali cooler 4 is connected to the electrolytic cell 1 through the fifth alkali pipe. The alkali circulation pump 5 is installed on the fifth alkali pipe. Hot water tracing coils 6 are coiled around the outside of each alkali pipe.
[0022] Hot water tracing coils 6 are also provided outside the shells of the hydrogen separator 2 and the oxygen separator 3.
[0023] By installing hot water tracing coils 6 outside the electrolyzer, and also using hot water tracing coils outside each alkali pipeline, hydrogen, and oxygen separator, when the electrolyzer is shut down, the alkali circulation pump in the hydrogen production system does not need to run, and the alkali system stops circulating, thus avoiding the problem of rising oxygen in hydrogen and hydrogen in oxygen due to solubility caused by alkali circulation.
[0024] The electrolytic cell is powered by either one positive and one negative or one positive and two negative power sources.
[0025] In addition to the above embodiments, the utility model also includes other implementation manners, and the technical scheme formed by using equivalent transformation or equivalent replacement should fall within the protection scope of the utility model claims.
Claims
1. A hot water tracing and temperature maintenance system for hydrogen production shutdown in an alkaline water electrolyzer, comprising an electrolyzer, a hydrogen separator, an oxygen separator, and an alkaline cooler, wherein the hydrogen-side outlet of the electrolyzer is connected to the hydrogen separator, and the oxygen-side outlet is connected to the oxygen separator; the alkaline outlets of the hydrogen separator and the oxygen separator are simultaneously connected to the alkaline cooler; and the alkaline cooler is connected to the electrolyzer via an alkaline circulation pump, characterized in that: The electrolytic cell is equipped with a hot water tracing coil, which is made of flexible, insulating, and high-temperature resistant material. The hot water inlet of the hot water tracing coil is equipped with a hot water flow regulating valve.
2. The hot water tracing and temperature maintenance system for hydrogen production shutdown in an alkaline water electrolyzer according to claim 1, characterized in that: The hot water inlet and outlet of the hot water tracing coil are both located on the negative electrode side of the electrolytic cell.
3. The hot water tracing and temperature maintenance system for hydrogen production shutdown in an alkaline water electrolyzer according to claim 1, characterized in that: The electrolytic cell is equipped with hot water tracing coils on the front and back sides, and one or more hot water tracing coils in parallel form a continuous, meandering, multi-stroke serpentine structure on the front and back sides of the electrolytic cell.
4. The hot water tracing and temperature maintenance system for hydrogen production shutdown in an alkaline water electrolyzer according to claim 1, characterized in that: The hot water inlet of the hot water tracing coil is located at the upper part of the electrolytic cell, and the hot water outlet is located at the lower part of the electrolytic cell.
5. The hot water tracing and temperature maintenance system for hydrogen production shutdown in an alkaline water electrolyzer according to claim 1, characterized in that: The hot water inlet temperature of the hot water tracing coil is medium-temperature hot water of 80~85℃, and the hot water outlet temperature is controlled at 70~75℃.
6. The hot water tracing and temperature maintenance system for hydrogen production shutdown in an alkaline water electrolyzer according to claim 1, characterized in that: The electrolytic cell is connected to the hydrogen separator and the oxygen separator respectively through the first alkali solution pipe and the second alkali solution pipe. The alkali solution outlet of the hydrogen separator and the alkali solution outlet of the oxygen separator are connected to the alkali solution cooler through the third alkali solution pipe and the fourth alkali solution pipe respectively. The alkali solution cooler is connected to the electrolytic cell through the fifth alkali solution pipe. The alkali solution circulation pump is installed on the fifth alkali solution pipe. Hot water tracing coils are coiled around the outside of each alkali solution pipe.
7. A hot water tracing and temperature maintenance system for hydrogen production shutdown in an alkaline water electrolyzer according to claim 1 or 6, characterized in that: Hot water tracing coils are also provided outside the shells of the hydrogen separator and oxygen separator.
8. The hot water tracing and temperature maintenance system for hydrogen production shutdown in an alkaline water electrolyzer according to claim 1, characterized in that: When the electrolytic cell is shut down, the hot water flow regulating valve is opened and the alkali circulation pump is closed; when the electrolytic cell is running, the hot water flow regulating valve is closed and the alkali circulation pump is opened.