Preparation Of Matrix In DIR-MCFC And Study On Cell Performance

Molten carbonate fuel cell (MCFC) is a kind of fuel cell working at 650℃, which has the advantages of unnecessariness to use pure hydrogen as fuel gas and noble metal catalysts, furthermore, which also has high importance to exploit the remainder heat in the off-gas. These make MCFC suitable to supply power as decentralized power plant.and convenient to achieve CHP (combined heat and power).Setting the catalysts for methane steam reforming in anode compartment constructs direct internal reforming molten carbonate fuel cell (DIR-MCFC). Hydrogen produced by reforming reaction is the reactant of electrolic reaction, and electrolic reaction generated water as the reactant of methane steam reforming. The heat released when MCFC works can sustain methane steam reforming. It will achieve double coupling in the heat and mass. Exploring DIR-MCFC with methane as fuel gas is an action of using methane and MCFC reasonably, also according to the trend of developing clean energy.Powders of lithium aluminate with two different sizes had been produced by sintering in high temperature. The effect of producing mathode including sintering temperatures and times, kinds of ball milling dispersive solutions, reactant ratios, crystal shapes of alumina, sintering atmospheres to the purity of powders was investigated in the paper. Matrix was made by tape-casting and a methode of producing an excellent matrix was summarized in the paper. A single cell was built by the matrix making beforehand and then the performance of cell was studied.The performance of cell fed with hydrogen and carbon dioxide as fuel gas was investigated. The investigative emphases were fastened on working pressures, fluxes of reactant, and utilizations of reactant.The single cell was constructed as the configuration of DIR-MCFC and the performance of cell with different working conditions was investigated, which included working pressures, reactant fluxes, and steam cabon ratios of reactants. The working condition of catalysts in the anode chamber were studied by analysising the components of anode exhausted gas with chromatogram.The technological conditions of powders synthesized and matrices tape-casted have been optimized by the works of investigations. After building MCFC with the matrix made by myself and investigating the cell performance, it has been found that the performance of cell can be improved by elevating the reactants pressure and flux. The steam carbon ratio in fuel gas has a notable effect on the cell performance at lower reactant pressure, but the effect is weakened at higher reactant pressure. Carbons can easier deposite on catalyst under higher reactant pressute and lower steam carbon ratio.In order to sustain the higher cell performance and stability, the catalyst capability to resist carbon depositing and alkali poisoning must be improved.