CN102095446A - Flat plate type solid oxide electrolytic cell pile test system - Google Patents

Abstract

The invention discloses a flat plate type solid oxide electrolytic cell pile test system, comprising a gas circuit portion, an electric pile pressurization test portion, an electrochemical test portion and a control and test portion, wherein the gas circuit portion comprises an anode gas circuit, a cathode gas circuit and a vapor circuit, and the electric pile pressurization test portion comprises a mechanical pressurization device, a pressure test device, a high temperature furnace and a bracket; the flat plate type solid oxide electrolytic cell pile test system to which the invention relates can be used for testing performances of flat plate type solid oxide electrolytic cell piles with different constitution structures, can realize the real-time observation and adjustment of the mechanical pressure applied to the electrolytic cell pile in the entire test process, and has the advantages of simplicity and convenience for operation, accurate measurement stability and the like.

Description

A flat-plate solid oxide electrolytic cell stack test system

technical field

The invention relates to a flat-plate solid oxide electrolytic cell stack test system, which belongs to the field of hydrogen production by high-temperature water vapor electrolysis.

Background technique

The high-temperature solid oxide electrolytic cell is a high-efficiency, low-pollution energy conversion device. Using it to electrolyze water vapor to produce hydrogen is a hot research topic in the energy field at present, and has broad development prospects. The development of high-temperature solid oxide electrolytic cell stack is the key to its practical application, and the development of stack-related test equipment plays an important role in promoting the research of high-temperature steam electrolysis hydrogen production technology.

During the testing of solid oxide stacks, the good sealing of the stack at high temperature is the guarantee of its successful operation. At present, the sealing methods of the flat-plate solid oxide electrolytic cell stack can be mainly divided into hard sealing and soft sealing. Both sealing methods need to exert a certain pressure on the stack to ensure its sealing effect. The test pressure of the general solid oxide electrolytic cell stack generally adopts the method of top weight, which has poor accuracy and is inconvenient to record and adjust the pressure on the stack during the test.

The patent with the publication number CN 101216495A discloses a high-temperature electrolysis online test system applied to the high-temperature steam electrolysis hydrogen production process. The test system has a detailed description of the gas circuit and control system, but it does not mention the part involving the test of the electric stack; however, there is a big difference between the test of the electric stack and the test of the single electrolytic cell. The sealing of the type stack is very important. In addition, the test system only considered the hydrogen and water vapor intake system, but did not consider the gas path of the oxygen electrode.

Contents of the invention

The invention proposes a flat plate solid oxide electrolytic cell stack test system, which can be used for stable and accurate testing of the flat high temperature solid oxide single electrolytic cell stack, and is of great significance for the development of high temperature solid oxide electrolytic cells.

Technical scheme of the present invention is as follows:

A flat-plate solid oxide electrolytic cell stack test system, including a gas circuit part, a stack pressurization test part, an electrochemical test part, and a control and test part; the gas circuit part includes an anode gas circuit, a cathode gas circuit, The water vapor gas circuit, the anode intake gas mixture preheater and the water vapor evaporation mixer are characterized in that: the stack pressurization test part includes a mechanical pressure device, a pressure measurement device, a high temperature furnace and a support; the mechanical The pressure device includes a pressure screw, a fixed sleeve, a pressure spring, a pressure knob, a connecting ferrule, a pressure transmission ceramic tube and a pressure head; the fixed sleeve is placed in the middle of the upper edge of the bracket, and the pressure screw passes through the middle. Over; the pressure spring is arranged on the pressure screw, and the pressure knob is arranged on the lower end of the pressure screw; the mechanical pressure measuring device includes a pile test base, a supporting ceramic tube, a sheath, a supporting ferrule, The pressure sensor and the sensor fixed adjustment base, the pressure sensor is fixed on the sensor fixed adjustment base, the supporting ceramic tube is in contact with the pressure sensor through the supporting ferrule, and the test base is set on the top of the supporting ceramic tube; the high temperature furnace is equipped with a temperature sensor , the pressure sensor and the temperature sensor are connected with the control and testing part through the signal line.

In the above technical solution, the anode gas path includes an air path, an oxygen gas path and a nitrogen gas path; the cathode gas path includes a hydrogen gas path, a nitrogen gas path, a carbon dioxide gas path and a carbon monoxide gas path; Each gas path of the system is equipped with a pressure reducing valve, a mass flow controller and a one-way valve in sequence. The preheating temperature of the anode inlet gas mixture preheater and the steam evaporation mixer is 600-800°C. The stack test base uses an alumina ceramic plate.

The present invention has the following advantages and prominent effects: ①Aiming at the test of flat plate high-temperature solid oxide electrolytic cell stack, it can be used for high-temperature electrolytic hydrogen production process research, process optimization, and stack material and design improvement; ②Designed mechanical pressurization and measurement The pressure device can display the change of the pressure in the whole process of the stack test in real time, and adjust the pressure of the stack according to the needs, so as to ensure the good air tightness of the stack during the test and make the test more stable and accurate; ③Test system It can be used to test both solid oxide electrolytic cells and solid oxide fuel cells; different air intakes and sensors can be used for co-electrolysis experiments.

Description of drawings:

Fig. 1 is a test system for a flat plate solid oxide electrolytic cell stack of the present invention.

Figure 2 is a schematic diagram of the stack pressure test device.

In the figure: 1-pressure reducing valve; 2-mass flow controller; 3-one-way valve; 4-metering pump; 5-anode inlet gas mixture preheater; 6-water vapor evaporation mixer; 9-anode exhaust Cooler; 10-cathode exhaust cooler; 11-pressurizing screw; 12-fixed sleeve; 13-pressurizing spring; 14-pressurizing knob; 15-connecting sleeve; 16-pressure transmission ceramic tube; 17-pressure 18-bracket; 19-stack test base; 20-support ceramic tube; 21-sheath; 22-support ferrule; 23-pressure sensor; 24-sensor fixed adjustment base.

Detailed ways

Below in conjunction with accompanying drawing and concrete example, the working principle of the present invention, specific embodiment and work process are further described:

FIG. 1 is a schematic diagram of a test system for a flat-plate solid oxide electrolytic cell stack according to the present invention. The test system mainly includes gas circuit part, stack pressure test part, electrochemical test part, control and test part. The gas path part includes anode gas path, cathode gas path and water vapor gas path, and each gas path is equipped with a pressure reducing valve 1, a mass flow controller 2 and a one-way valve 3 in sequence; the anode gas path mainly includes an air pressure reducing valve 1. Oxygen decompression valve 1, nitrogen decompression valve 1, and corresponding mass flow controller 2 and check valve 3; the cathode gas path includes hydrogen decompression valve 1, nitrogen decompression valve 1, carbon dioxide decompression valve 1, Carbon monoxide pressure reducing valve 1 and corresponding mass flow controller 2 and check valve 3; intake system also includes metering pump 4, anode intake gas mixture preheater 5 and water vapor evaporation mixer 6, anode tail gas cooler 9 and cathode exhaust cooler 10. The flow rate, temperature, humidity and pressure of the gas path system are connected with the test control part through corresponding sensors. The stack pressure test part includes a mechanical pressure device, a pressure measuring device, a high temperature furnace 7 and a support 18; the mechanical pressure device includes a pressure screw 11, a fixed sleeve 12, a pressure spring 13, a pressure knob 14, and a connection Ferrule 15, pressure transmission ceramic tube 16 and pressure head 17; fixed sleeve 12 is placed in the middle of the upper edge of the bracket, pressure screw 11 passes through the middle, pressure spring 13 is arranged on the pressure screw 11, and the lower end is set A pressure knob 14, the mechanical pressure measuring device includes a stack test base 19, a supporting ceramic tube 20, a sheath 21, a supporting ferrule 22, a pressure sensor 23, a sensor fixing support 24, and the pressure sensor 23 is fixed on the sensor fixing support 24, the supporting ceramic tube 20 is in contact with the pressure sensor 23 through the supporting ferrule 22, and the test base 19 is arranged on the top of the supporting ceramic tube 20; the high temperature furnace 7 is provided with a temperature sensor, and the pressure sensor 23 and the temperature sensor are connected to the control via the signal line. And the test part is connected.

The main operation process of this test system is: first check whether the gas cylinder, gas circuit, circuit and various parts of equipment are normal, and whether the surrounding environment of the test system meets the safety requirements of the experiment. Open the high-temperature furnace 7, confirm whether the position of the electric furnace pressurizing device and the stack test base 19 is suitable, connect the pressure sensor 23 power supply, and preheat and debug the pressure sensor 23; the assembled electric stack 8 to be tested is placed in the high-temperature furnace 7 On the stack test base 19; connect the gas circuit and electrical connection wires, carefully rotate the pressurization knob 14, fix the stack 8 in a proper position, and make the center of gravity of the pressurization screw 10, the stack 8, and the pressure sensor 23 in a straight line ; Carefully close the high-temperature furnace 7, fix the gas circuit and the electrical connection wire, fill the gap of the furnace mouth with refractory fiber cotton; adjust the pressure sensor 23 to zero, and prepare to start the test.

Open the external gas cylinder, adjust the pressure reducing valve 1 to a suitable pressure range, the gas composition of the anode side is precisely controlled by the mass flow controller 2, and the cathode gas composition is precisely controlled by the mass flow controller 2. During the hydrogen production test, the gas at the anode is generally air, that is, open the pressure reducing valve 1, and the mass flow controller 2; the gas on the cathode side is hydrogen and nitrogen, that is, open the pressure reducing valve 1, and the mass flow controller 2; the one-way valve The effect of 3 is to prevent the retrograde flow of mixed gas. Adjust the flow rate of the metering pump 4 according to the needs of the test, the liquid water enters the water vapor evaporator mixer 6 to mix with hydrogen and nitrogen, and the gas temperature is heated to 600-800°C as required; the anode intake enters the anode intake air mixture preheater 5 , the preheating temperature is 600-800°C. The reaction products at the anode and cathode sides are cooled to room temperature through an anode tail gas cooler 9 and a cathode tail gas cooler 10 . All parametric tests and controls are performed through the Test and Control section.

Claims (4)

1. A flat plate solid oxide electrolytic cell stack test system, comprising a gas circuit part, a stack pressurization test part, an electrochemical test part and a control and test part; the gas circuit part comprises an anode gas circuit, a cathode gas circuit road, water vapor gas path, anode intake gas mixture preheater (5) and water vapor evaporation mixer (6), characterized in that: the stack pressurization test part includes a mechanical pressurization device, a pressure measurement device , a high temperature furnace (7) and a support (18); the mechanical pressurizing device includes a pressurizing screw (11), a fixed sleeve (12), a pressurizing spring (13), a pressurizing knob (14), a connecting ferrule ( 15), the pressure transmission ceramic tube (16) and the pressure head (17); the fixed sleeve (12) is placed in the middle of the upper edge of the bracket, and the pressure screw (11) passes through the middle; the pressure spring (13) is set On the pressure screw (11), the pressure knob (14) is arranged at the lower end of the pressure screw; the mechanical pressure measuring device includes a stack test base (19), a supporting ceramic tube (20), a protective sleeve (21), support ferrule (22), pressure sensor (23) and sensor fixed adjustment base (24), the pressure sensor (23) is fixed on the sensor fixed adjustment base (24), and the support ceramic tube (20) passes through the support Ferrule (22) is in contact with pressure sensor (23), and test base (19) is arranged on the top of support ceramic tube (20); Described high-temperature furnace (7) is provided with temperature sensor, and described pressure sensor (23 ) and the temperature sensor are connected to the control and test part through the signal line. 2. according to a kind of flat type solid oxide electrolytic cell stack test system according to claim 1, it is characterized in that: described anode gas circuit comprises air gas circuit, oxygen gas circuit and nitrogen gas circuit; Described cathode gas circuit The gas path includes a hydrogen gas path, a nitrogen gas path, a carbon dioxide gas path and a carbon monoxide gas path; a pressure reducing valve (1), a mass flow controller (2) and a one-way valve (3 ). 3. according to a kind of plate type solid oxide electrolytic cell stack test system according to claim 1, it is characterized in that: the preheating temperature of anode inlet gas mixture preheater (5) and water vapor evaporation mixer (6) It is 600-800°C. 4. A flat-plate solid oxide electrolytic cell stack test system according to claim 1, characterized in that: the stack test base (19) adopts an alumina ceramic plate.

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