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CN-122017347-A - Alkaline hydrogen production diaphragm surface resistance testing device for simulating pressurization working condition

CN122017347ACN 122017347 ACN122017347 ACN 122017347ACN-122017347-A

Abstract

A testing device for the surface resistance of alkaline hydrogen-producing diaphragm is composed of left and right end plates, insulating sealing gaskets, insulating electrolyte cavities, electrode plates, diaphragm fixing plates and fastening units, liquid injection/discharge interfaces and gas pressurizing interfaces for injecting electrolyte to form liquid phase and to reserve gas phase space, external gas source, pressure regulating valve and pressure monitor, and pressure monitor for pressurizing gas phase space to form controllable absolute pressure or differential pressure on both sides of diaphragm to simulate the running condition of pressurized electrolyzer, and measuring system resistance by AC impedance method. The invention has simple structure, good sealing performance and controllable pressure, and the obtained data is more close to the real pressurizing working condition, thus being applicable to the evaluation and research of the electrical property of the alkaline electrolytic water diaphragm.

Inventors

  • ZHANG WENJUAN
  • LIU GANG

Assignees

  • 合肥膜钧科技有限公司

Dates

Publication Date
20260512
Application Date
20260212

Claims (8)

  1. 1. The alkaline hydrogen production membrane surface resistance testing device for simulating the pressurizing working condition is characterized by comprising a left end plate (31), a right end plate (32), a left electrode plate (41), a right electrode plate (42), a left insulating electrolyte containing cavity (51, 52), a left membrane fixing plate (61) and a right membrane fixing plate (62), a multi-layer insulating sealing gasket and a fastening assembly; the left and right side end plates (31, 21) for the sealing means; The left electrode plate (41) and the right electrode plate (42) are arranged on two sides of the diaphragm, a through hole or a netlike opening is arranged in the center of the electrode plate, and a lug is arranged at the outer edge of the electrode plate for electric connection; The left and right insulating electrolyte containing cavities (51, 52) are provided with through holes at the centers and respectively provided with a liquid injection/drainage interface and a gas pressurizing interface, and are used for forming liquid phase electrolyte and a gas phase space above the liquid phase electrolyte in the containing cavities; the left diaphragm fixing plate block (61) and the right diaphragm fixing plate block (62) are used for clamping a diaphragm to be tested; The multi-layer insulating sealing gaskets are divided into large-opening insulating sealing gaskets and small-opening insulating gaskets, the large-opening insulating sealing gaskets are arranged on two sides of the insulating electrolyte containing cavity, and the small-opening insulating sealing gaskets are arranged on two sides of the polar plate, the diaphragm and the diaphragm fixing plate and are used for sealing gaps of various structures; The fastening assembly comprises an insulating bolt (8) and a nut (9) and is used for pressing the components in the thickness direction to form a sealed test cavity.
  2. 2. The experimental device according to claim 1, further comprising an external gas source (10), a pressure regulating valve (11) and a pressure monitoring component (12) for pressurizing the gas phase space; The external air source (10) is connected with the pressure regulating valve (11) and the pressure monitoring component (12) to pressurize the gas phase space; The gas pressurizing interface is externally connected with a gas supply and pressure control unit, and the pressure control unit at least comprises a pressure regulating valve, a pressure monitoring component and a safety pressure relief component and is used for stably controlling the gas phase pressure at a target value.
  3. 3. The experimental apparatus according to claim 1, wherein the liquid injection/discharge ports of the left and right insulating electrolyte chambers (51, 52) are provided at the lower portion of the chambers, the liquid level is made higher than the central opening area of the electrode sheets (41, 42) by injecting the electrolyte, and a gas phase space is reserved at the upper portion of the chambers for gas pressurization.
  4. 4. The experimental apparatus according to claim 3, wherein the left and right insulating electrolyte chambers (51, 52) are isolated from each other and independently pressurized through respective gas pressurizing interfaces, respectively, to achieve simulation of conditions of constant pressure or differential pressure on both sides of the diaphragm.
  5. 5. An experimental device according to claim 1 or 3, characterized in that the central openings of the electrode plates (41, 42) are of a grid-like or porous open-cell structure for facilitating the circulation of the electrolyte.
  6. 6. An experimental method for measuring the surface resistance of an alkaline electrolyzed water membrane by using the experimental device of any one of claims 1 to 5, which is characterized by comprising the following steps: (1) Membrane pretreatment, namely soaking a membrane to be tested in an alkaline solution for 24 h to fully wet the membrane; (2) The device is assembled by stacking a left end plate, a sealing gasket, a left electrolyte cavity, a left electrode plate, a left diaphragm fixing plate block, a diaphragm, a right diaphragm fixing plate block, a right electrode plate, a right electrolyte cavity and a right end plate in sequence and fastening with a torque of 1-2 N.m; (3) Injecting electrolyte through the electrolyte injecting/draining interfaces of the left electrolyte containing cavity and the right electrolyte containing cavity to make the electrolyte level higher than the center hole of the electrode plate and to reserve gas phase space in the upper part of the containing cavity; (4) Pressurizing and stabilizing, namely introducing gas into the gas-phase space of at least one side of the accommodating cavity, regulating the gas-phase pressure to target pressure through a pressure regulating valve, and keeping the pressure for a preset time to stabilize the pressure; (5) The electrochemical test, namely connecting the electrode lug with an electrochemical workstation, and adopting an alternating current impedance method for testing, wherein the frequency range is 1 Hz-10 6 Hz; (6) Data processing, namely reading real axis intercept of high-frequency end of Nyquist diagram to calculate resistance value according to formula R A = (R Z R 0 ) multiplied by A, wherein R Z is a test resistor with a diaphragm, R 0 is a blank device resistor, A is an effective test area, and R A is calculated as the surface resistance of the diaphragm under specific pressure.
  7. 7. The method of claim 6, wherein: and (3) in the step (4), the target pressure is 0.1-3.0 MPa, or the pressure fluctuation is recorded in real time by a pressure monitoring component for data correction according to the working condition of the tested electrolytic tank.
  8. 8. An experimental method according to claim 6 or 7, which is used for evaluating the surface resistance change of the diaphragm under different pressures, exploring the influence of the pressure on the surface resistance of the diaphragm and simulating the real working condition.

Description

Alkaline hydrogen production diaphragm surface resistance testing device for simulating pressurization working condition Technical Field The invention relates to the technical field of electrolytic water hydrogen production test, in particular to an alkaline hydrogen production diaphragm surface resistance test device for simulating a pressurizing working condition in a controllable voltage environment. Background The hydrogen production by alkaline water electrolysis is widely applied due to mature technology and low cost. The diaphragm is used as a key component of the electrolytic cell, and the surface resistance of the diaphragm directly influences the cell pressure drop and the system energy consumption. In industrial applications, alkaline cells are often operated at a pressure to increase hydrogen delivery efficiency and reduce subsequent compression costs, and at the same time, there may be absolute pressure changes or transient differential pressures between the anode and cathode compartments during start-up and shut-down, load fluctuations, or system control. The pore structure and the wetting state of the diaphragm may change under a pressurized environment, so that the surface resistance deviates from the normal pressure test result. The existing diaphragm surface resistance test is mostly carried out under normal pressure or open environment, and the pressure-controllable simulation test is difficult to realize under the closed condition, so that the obtained data has insufficient comparability with the actual pressurizing working condition. Therefore, the experimental device and the method which can controllably adjust the pressure at two sides of the diaphragm in the closed device and conduct the alternating current impedance test under the target pressure are developed, and have important significance for obtaining the diaphragm electrical property data which is closer to the real working condition. Disclosure of Invention The invention aims to provide a device and a method for testing resistance of an alkaline hydrogen production diaphragm under different pressures based on gas phase pressurization, which are used for overcoming the defects that the testing pressure is uncontrollable and is not matched with the operation condition of a pressurized electrolytic cell in the prior art. The invention has the core concept that the two sides of the diaphragm are provided with mutually isolated electrolyte containing cavities, the electrolyte forms controllable absolute pressure or differential pressure on the two sides of the diaphragm by reserving a gas phase space above the electrolyte and carrying out gas phase pressurization, and then the system resistance is measured by adopting an alternating current impedance method under the pressure, so that the surface resistance of the diaphragm under the pressurization working condition is obtained. In order to achieve the above purpose, the invention adopts the following technical scheme: The invention provides an alkaline hydrogen production membrane surface resistance testing device for simulating a pressurizing working condition, which comprises a left end plate (31), a right end plate (32), a left electrode plate (41), a right electrode plate (42), a left insulating electrolyte containing cavity (51, 52), a left membrane fixing plate (61) and a right membrane fixing plate (62), a multi-layer insulating sealing gasket and a fastening assembly; the left and right side end plates (31, 21) for the sealing means; The left electrode plate (41) and the right electrode plate (42) are arranged on two sides of the diaphragm, a through hole or a netlike opening is arranged in the center of the electrode plate, and a lug is arranged at the outer edge of the electrode plate for electric connection; The left and right insulating electrolyte containing cavities (51, 52) are provided with through holes at the centers and respectively provided with a liquid injection/drainage interface and a gas pressurizing interface, and are used for forming liquid phase electrolyte and a gas phase space above the liquid phase electrolyte in the containing cavities; the left diaphragm fixing plate block (61) and the right diaphragm fixing plate block (62) are used for clamping a diaphragm to be tested; The multi-layer insulating sealing gaskets are divided into large-opening insulating sealing gaskets and small-opening insulating gaskets, the large-opening insulating sealing gaskets are arranged on two sides of the insulating electrolyte containing cavity, and the small-opening insulating sealing gaskets are arranged on two sides of the polar plate, the diaphragm and the diaphragm fixing plate and are used for sealing gaps of various structures; The fastening assembly comprises an insulating bolt (8) and a nut (9) and is used for pressing the components in the thickness direction to form a sealed test cavity. Preferably, the device also comprises an external gas source (10), a