Starting method for molten carbonate fuel cell stack

Abstract

Disclosed is a starting method for a molten carbonate fuel cell stack. The starting method specifically comprises the steps of (1) working out required air flow according to the value of power of the cell stack; (2) heating the cell stack at the heating rate of not greater than 5 DEG C / min; (3) from the room temperature to 200 DEG C, pumping set air amount from the negative electrode side of the cell stack, and ensuring that the sealing surface of the cell stack has 20-30% of gas leakage amount; (4) from 200 DEG C to 450 DEG C, increasing carbon dioxide on the negative electrode side of the cell stack, wherein the gas amount is half of the air flow; when the temperature reaches 450 DEG C, ensuring that the sealing surface has no gas leakage; (5) from 450 DEG C to 550 DEG C, closing negative electrode air inlet, and performing a salt dissolving stage on the cell stack; (6) from 550 DEG C to 650 DEG C, pumping nitrogen to the positive electrode to restore an electrode; and (7) when the temperature reaches 650 DEG C, pumping air and carbon dioxide to the negative electrode to perform discharging performance test. By virtue of the starting method, the risk of carbon accumulation in the high-power molten carbonate fuel cell stack in a roasting process can be effectively lowered, and success rate of stably outputting power of the cell stack is effectively improved.

Description

technical field [0001] The invention relates to the technical field of molten carbonate fuel cells, in particular to a method for starting 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 of fuel CO, CO 2...

AI Technical Summary

Problems solved by technology

In the kilowatt-level to hundreds of kilowatt-level battery stack tests, in order to improve power generation efficiency and reduce power generation costs, compressed air is generally used for roasting, so inside the battery stack with more than 50 cells, due to the influence of many factors such as uneven air distribution, The electrolyte separator is likely to be poorly baked and cause the battery to accumulate carbon, thereby affecting the performance output of the battery stack