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Molten carbonate fuel cell stack electrolyte supplementing method

A technology of molten carbonate and fuel cell stacks, which is applied in the direction of molten electrolyte fuel cells, fuel cells, fuel cell additives, etc., can solve problems such as electrolyte loss, and achieve the effect of improving performance and life

Active Publication Date: 2020-03-24
HUANENG CLEAN ENERGY RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a molten carbonate fuel cell stack electrolyte replenishment method, which solves the defect of the existing molten carbonate fuel cell stack electrolyte loss, and greatly improves the life and stable operation of the battery stack

Method used

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  • Molten carbonate fuel cell stack electrolyte supplementing method

Examples

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Effect test

Embodiment 1

[0046] 1) First, prepare a 5kW molten carbonate fuel cell stack whose performance has declined after running for a certain period of time. The stack consists of 36 cells, and the effective area of ​​each cell is 2000cm 2 The cells are connected in series;

[0047] 2) According to the structure of the bipolar plate and battery end plate of the 5kW MCFC battery stack, the volume of the flow field and flow channel in the battery stack is calculated to be about 0.036m 3 . Mix lithium carbonate and potassium carbonate with a molar percentage of 62:38, and then mix and stir with a 0.5% polyvinyl alcohol aqueous solution to prepare an electrolyte colloid solution containing 10% electrolyte and a viscosity of 200Pa·s. 3 times the volume of field and flow channel;

[0048] 3) Put the configured electrolyte colloidal solution into a closed container with an inlet and outlet. The inlet and outlet of the container are respectively connected with the battery stack and the solution circul...

Embodiment 2

[0053] Same as Example 1, the difference is that the preparation of the electrolyte colloid solution:

[0054] Mix lithium carbonate and potassium carbonate with a molar percentage of 62:38, and then mix and stir with a 1.5% polyvinyl alcohol aqueous solution to prepare an electrolyte colloid solution containing 15% electrolyte and a viscosity of 200 Pa·s.

Embodiment 3

[0056] Same as Example 1, the difference is that the preparation of the electrolyte colloid solution:

[0057] Mix lithium carbonate and potassium carbonate with a molar percentage of 62:38, and then mix and stir with a 3% polyvinyl alcohol aqueous solution to prepare an electrolyte colloid solution containing 20% ​​electrolyte and a viscosity of 200 Pa·s.

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Abstract

The invention provides a molten carbonate fuel cell stack electrolyte supplementing method, which comprises: 1, preparing an electrolyte colloidal solution containing 10-20% of an electrolyte, the viscosity of the electrolyte colloidal solution being 200-800 Pa.s; 2, supplementing the electrolyte of the cell stack by using the electrolyte colloidal solution prepared in the step 1 to obtain an electrolyte adhered to an electrode and an internal flow channel of the cell stack; 3, discharging the redundant electrolyte colloidal solution in the cell stack; 4, under the condition of inert gas, drying and discharging moisture or an organic solvent in the cell stack to complete the supplement of the electrolyte of the cell stack, then raising the temperature and carrying out a discharge performance test. The method can effectively supplement performance reduction and service life reduction caused by electrolyte loss in the high-temperature operation process of the molten carbonate fuel cell,and has important guiding significance for improving and stabilizing the performance and the service life of the molten carbonate fuel cell.

Description

technical field [0001] The invention relates to the technical field of molten carbonate fuel cells, in particular to an electrolyte replenishment method for a molten carbonate fuel cell stack. 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/04276H01M8/14
CPCH01M8/04276H01M8/145H01M2008/147Y02E60/50H01M8/04283H01M2300/0051H01M8/2457
Inventor 程健张瑞云卢成壮李昊许世森王保民杨冠军
Owner HUANENG CLEAN ENERGY RES INST