Alkali liquor concentration control device for hydrogen production by electrolysis of water

Abstract

The utility model discloses a water electrolysis hydrogen production alkali liquor concentration control device which comprises a water electrolysis system, an alkali liquor concentration measuring mechanism; the alkali liquor concentration measuring mechanism is arranged in the electrolyzed water system and is used for measuring the concentration of alkali liquor; an alkali liquor supplementing mechanism; when the concentration of the alkali liquor in the electrolyzed water system is lower than a threshold value, the alkali liquor supplementing mechanism supplements the alkali liquor with higher concentration into the electrolyzed water system; a pure water supplementing mechanism; when the concentration of the alkali liquor in the electrolyzed water system is higher than a threshold value, the pure water supplementing mechanism supplements pure water into the electrolyzed water system. According to the utility model, the concentration control is realized by monitoring the concentration change of the alkali liquor and controlling the supplement of high-concentration alkali liquor or pure water in the electrolyzed water system according to a set threshold value, and the automatic monitoring and control can be realized by combining with a control system.

Description

Technical Field

[0001] This utility model relates to the field of hydrogen electrolyzers, and in particular to a device for controlling the concentration of alkaline solution in water electrolysis for hydrogen production. Background Technology

[0002] Alkaline water electrolysis for hydrogen production is currently the most mature and economical hydrogen production technology. This technology uses direct current to electrolyze water into hydrogen and oxygen, with hydrogen produced at the cathode and oxygen at the anode. According to Faraday's law, the hydrogen production from alkaline water electrolysis is directly proportional to the current; therefore, KOH solution is typically used as the electrolyte to increase the ion concentration. The KOH concentration in the solution has a significant impact on increasing the electrolysis current; a 30% KOH solution has the highest conductivity and is considered the optimal concentration.

[0003] However, current technologies primarily rely on manual periodic monitoring and replenishment to control the concentration of the alkali solution, which is inefficient and cannot be adjusted in real time. Too low a concentration leads to reduced electrolysis efficiency, while too high a concentration causes other problems. Summary of the Invention

[0004] Purpose of this utility model: This utility model requests protection for a device for controlling the concentration of alkaline solution in water electrolysis for hydrogen production. This device automatically controls the concentration of alkaline solution by monitoring the density of the alkaline solution, and can adjust the concentration of alkaline solution in real time to improve the hydrogen production efficiency, thus solving the problem of low efficiency in traditional manual control of alkaline solution concentration.

[0005] Technical solution: The electrolytic water hydrogen production alkaline solution concentration control device provided by this utility model includes:

[0006] Electrolysis water system;

[0007] Alkali concentration measuring mechanism; the alkali concentration measuring mechanism is placed in the water electrolysis system to measure the alkali concentration;

[0008] Alkali replenishment mechanism: When the alkali concentration in the water electrolysis system is lower than the threshold, the alkali replenishment mechanism replenishes the water electrolysis system with a higher concentration of alkali.

[0009] Pure water replenishment mechanism: When the alkaline concentration in the water electrolysis system is higher than the threshold, the pure water replenishment mechanism replenishes pure water to the water electrolysis system.

[0010] Furthermore, the water electrolysis system includes an electrolytic cell, an oxygen separation cooler, a hydrogen separation cooler, an oxygen integration tower, and a hydrogen integration tower, which are connected by pipelines to realize the water electrolysis function.

[0011] Furthermore, the alkali concentration measuring mechanism is a density sensor, which is connected to the control system to obtain the concentration of the alkali solution based on its density.

[0012] Furthermore, the density sensor is located in the alkali circulation pipeline of the electrolytic cell, and the alkali circulation pipeline is equipped with an alkali circulation pump.

[0013] Furthermore, the alkali replenishment mechanism includes an alkali tank, an alkali metering pump, and an alkali control valve. The alkali tank is connected to an alkali circulation pipeline via an alkali delivery pipeline. The alkali metering pump and the alkali control valve are located on the alkali delivery pipeline and are connected to a control system.

[0014] Furthermore, the pure water replenishment mechanism includes a pure water tank, a pure water metering pump, and a pure water control valve. The pure water tank is connected to the water electrolysis system through a pure water delivery pipeline. The pure water metering pump and the pure water control valve are located on the pure water delivery pipeline and are connected to the control system.

[0015] Furthermore, the water electrolysis system is equipped with a level gauge and connected to the control system.

[0016] Beneficial effects: Compared with the prior art, the advantages of this utility model are: concentration changes are reflected by density monitoring, and the concentration is controlled by adding high-concentration alkaline solution or pure water to the electrolyzed water system according to the set threshold. It can be combined with the control system to realize automated monitoring and control. Attached Figure Description

[0017] Figure 1 This is a connection diagram of the overall system of this utility model. Detailed Implementation

[0018] like Figure 1 The electrolytic water hydrogen production alkaline solution concentration control device shown includes:

[0019] Electrolysis water system;

[0020] The water electrolysis system includes an electrolysis cell 1, an oxygen separation cooler 2, a hydrogen separation cooler 3, an oxygen integrated tower 4, and a hydrogen integrated tower 5. The water electrolysis function is achieved through pipeline connections. The pipeline connection method and electrolysis principle adopt existing technologies, which will not be elaborated here.

[0021] Alkali concentration measuring device;

[0022] The alkali concentration measuring mechanism is density sensor 6, which uses a high-precision density measuring device such as a vibrating tube density meter or a Coriolis mass flow meter.

[0023] The density sensor 6 is placed in the alkali circulation pipeline 7 of the electrolytic cell 1. The alkali circulation pipeline 7 is equipped with an alkali circulation pump 8 to obtain the density of the alkali.

[0024] Density sensor 6 is connected to the control system. Based on the relationship between alkali concentration and density in the existing technology, the concentration of alkali is obtained from the density of alkali.

[0025] Alkali replenishment mechanism;

[0026] The alkali replenishment mechanism includes an alkali tank 9, an alkali metering pump 10, and an alkali control valve 11.

[0027] Alkali tank 9 contains concentrated alkali solution.

[0028] The alkali tank 9 is connected to the alkali circulation pipeline 7 via the alkali delivery pipeline. The alkali metering pump 10 and the alkali control valve 11 are located on the alkali delivery pipeline and are connected to the control system.

[0029] When the concentration of alkali in the water electrolysis system is lower than the threshold, the alkali replenishment mechanism replenishes the water electrolysis system with a higher concentration of alkali.

[0030] The concentration of the alkali solution in the alkali solution tank 9 is higher than a set threshold concentration. In this embodiment, the concentration range of the concentrated alkali solution is 30%~50%, preferably 40%, and the replenishment amount ranges from 1L to 10L, preferably 5L.

[0031] Pure water replenishment system;

[0032] The pure water replenishment mechanism includes a pure water tank 12, a pure water metering pump 13, and a pure water control valve 14.

[0033] The resistivity of pure water ranges from 10 MΩ·cm to 18 MΩ·cm, preferably 16 MΩ·cm, and the replenishment amount ranges from 1 L to 20 L, preferably 10 L.

[0034] The pure water tank 12 is connected to the oxygen integrated tower 4 and hydrogen integrated tower 5 of the water electrolysis system through a pure water delivery pipeline.

[0035] The pure water metering pump 13 and the pure water control valve 14 are located on the pure water delivery pipeline and are connected to the control system.

[0036] When the concentration of alkali solution in the water electrolysis system is higher than the threshold, the pure water replenishment mechanism replenishes pure water into the water electrolysis system. The oxygen separation cooler 2 and the hydrogen separation cooler 3 are equipped with level gauges 15, which are connected to the control system, so that the level can be monitored when pure water is replenished.

Claims

1. A device for controlling the concentration of alkaline solution in water electrolysis for hydrogen production, characterized in that, include: Electrolysis water system; Alkali concentration measuring mechanism; the alkali concentration measuring mechanism is placed in the water electrolysis system to measure the alkali concentration; Alkali replenishment mechanism; When the concentration of alkali in the water electrolysis system is lower than the threshold, the alkali replenishment mechanism replenishes the water electrolysis system with a higher concentration of alkali. Pure water replenishment mechanism: When the alkaline concentration in the water electrolysis system is higher than the threshold, the pure water replenishment mechanism replenishes pure water to the water electrolysis system.

2. The device for controlling the concentration of alkaline solution in water electrolysis for hydrogen production according to claim 1, characterized in that: The water electrolysis system includes an electrolysis cell (1), an oxygen separation cooler (2), a hydrogen separation cooler (3), an oxygen integrated tower (4), and a hydrogen integrated tower (5), which are connected by pipelines to realize the water electrolysis function.

3. The device for controlling the concentration of alkaline solution in water electrolysis for hydrogen production according to claim 1, characterized in that: The alkaline solution concentration measuring mechanism is a density sensor (6), which is connected to the control system to obtain the concentration of the alkaline solution based on its density.

4. The device for controlling the concentration of alkaline solution in water electrolysis for hydrogen production according to claim 3, characterized in that: The density sensor (6) is located in the alkaline circulation pipeline (7) of the electrolytic cell (1), and the alkaline circulation pipeline (7) is equipped with an alkaline circulation pump (8).

5. The device for controlling the concentration of alkaline solution in water electrolysis for hydrogen production according to claim 4, characterized in that: The alkali replenishment mechanism includes an alkali tank (9), an alkali metering pump (10), and an alkali control valve (11). The alkali tank (9) is connected to the alkali circulation pipeline (7) through an alkali delivery pipeline. The alkali metering pump (10) and the alkali control valve (11) are located on the alkali delivery pipeline. The alkali metering pump (10) and the alkali control valve (11) are connected to the control system.

6. The device for controlling the concentration of alkaline solution in water electrolysis for hydrogen production according to claim 3, characterized in that: The pure water replenishment mechanism includes a pure water tank (12), a pure water metering pump (13), and a pure water control valve (14). The pure water tank (12) is connected to the electrolyzed water system through a pure water delivery pipeline. The pure water metering pump (13) and the pure water control valve (14) are located on the pure water delivery pipeline. The pure water metering pump (13) and the pure water control valve (14) are connected to the control system.

7. The device for controlling the concentration of alkaline solution in water electrolysis for hydrogen production according to claim 6, characterized in that: The water electrolysis system is equipped with a level gauge (15) and is connected to the control system.

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