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A Performance Diagnosis Method for Molten Carbonate Fuel Cells

A molten carbonate and fuel cell technology, applied in fuel cells, fuel cell additives, circuits, etc., can solve the problems of MCFC performance diagnosis and guidance that have nothing to do with dissertations and works, so as to save cost and investment and accelerate research progress Effect

Active Publication Date: 2016-02-10
HUANENG CLEAN ENERGY RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] my country's research on MCFC is still in its infancy. At present, the units engaged in MCFC research mainly include Dalian Institute of Chemical Physics, Chinese Academy of Sciences, China Huaneng Group Clean Energy Technology Research Institute Co., Ltd., and some colleges and universities. There are no relevant treatises and works on guidance

Method used

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  • A Performance Diagnosis Method for Molten Carbonate Fuel Cells
  • A Performance Diagnosis Method for Molten Carbonate Fuel Cells
  • A Performance Diagnosis Method for Molten Carbonate Fuel Cells

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1: Matching among molten carbonate fuel cell lithium metaaluminate diaphragm, carbonate electrolyte and electrodes

[0028] The molten carbonate fuel cell is a high-temperature fuel cell, and there is no hydrophobic agent in the porous electrode. The distribution of the carbonate electrolyte between the lithium metaaluminate diaphragm and the electrode is balanced by capillary force. First, ensure that the diaphragm is filled with Electrolyte, so the pore size of the diaphragm should be the smallest; in order to reduce the polarization of the cathode, promote the mass transfer of oxygen in the cathode, and prevent the cathode from being flooded by the electrolyte, the pore size of the cathode should be the largest, while the anode should be in the middle, and the following matching needs to be satisfied between the three relation:

[0029] γ c cos θ ...

Embodiment 2

[0032] Example 2: Measurement of gas leakage and blow-by during the heating and sintering process of molten carbonate fuel cells

[0033] When the battery starts to heat up from room temperature to 450°C, record the intake and output of the anode or cathode of the battery to ensure that the output of one pole of the battery is 90% of the intake, so that 10% of the intake is from the battery seal Leakage from the surface, which can ensure the full combustion of the diaphragm on the sealing surface of the battery; at the same time, adjust the exhaust valve of one pole so that 50% of the air passes through the surface of the diaphragm and is discharged from the exhaust port of the other pole. When the temperature reaches 450°C, because the carbonate electrolyte gradually begins to soften until it is in a molten state at about 500°C, and finally the electrolyte is completely immersed in the separator, the battery should not have gas leakage and blow-by in normal conditions. If the...

Embodiment 3

[0034] Embodiment 3: Measurement of battery open circuit voltage

[0035] When the battery is in a normal state in Embodiment 1 and Embodiment 2, it is necessary to measure and analyze the open circuit voltage of the battery. When the battery is heated up to 500°C, the carbonate electrolyte is basically in a molten state, and theoretically it is completely immersed in the lithium metaaluminate diaphragm. At this time, the anode is fed with N 2 For protection, the cathode is fed with air to continue oxidation, due to the anode N 2 For protection, a certain potential will be generated between the two poles, showing a certain open circuit voltage, until the open circuit voltage tends to a stable value after 650 °C. For example, the prepared lithium metaaluminate separator has a porosity of 58% after full combustion, and with an electrolyte of 0.96 times the weight of lithium metaaluminate powder, if the battery does not have blow-by and gas leakage after full combustion, its nor...

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Abstract

A performance diagnosis method for molten carbonate fuel cell comprises the following specific steps: step one, judging whether the lithium meta-aluminate diaphragm, the carbonate electrolyte, and the electrodes are well matched or not during the assembly process; step two, measuring the gas leakage amount and the gas blow-by amount during the cell heating sintering process so as to determine whether the cell diaphragm is fully sintered or not; step three, introducing nitrogen gas into the positive pole and air into the negative pole after the lithium meta-aluminate diaphragm is totally immersed in the carbonate electrolyte, recording the open-circuit voltage rising situation of the cell, and analyzing the formation situation of the three-phase interface in the cell on the basis of the data of the open-circuit voltage rising situation of the cell; according to the three conditions mentioned above, a forecast can be obtained; if one condition of the three conditions mentioned above does not meet the related requirements, people can judge that the assembled cell is disqualified, and thus people can stop the experiment. The method can provide a macroscopic guide for cell experiments, can also save the cost of cell experiments, and has an important practical value on electricity generating experiments and researches of molten carbonate fuel cell.

Description

technical field [0001] The invention belongs to the technical field of molten carbonate fuel cells, in particular to a performance diagnosis method for molten carbonate fuel cells. Background technique [0002] A fuel cell is a power generation device that directly converts the chemical energy of fuel into electrical energy by electrochemical reaction without combustion. Its biggest feature is that the reaction process does not involve combustion, so the energy conversion efficiency is not limited by the "Carnot cycle". , The efficiency is as high as 50% to 60%. When the fuel cell is working, hydrogen or other fuel is input to the anode, and the electrochemical reaction of hydrogen or other fuel oxidation and oxygen reduction occurs at the interface between the electrode and the electrolyte, generating current and outputting electrical energy. Compared with thermal power generation, the fuel cell power generation process does not go through the direct combustion of fuel, CO...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/04313H01M8/04537G01R31/36
CPCG01R31/382G01R31/3835H01M8/04Y02E60/50
Inventor 许世森张瑞云程健徐越任永强
Owner HUANENG CLEAN ENERGY RES INST