多烃类燃料单气室燃料电池及余热利用系统研究凝聚态物理专业论文.docxVIP

哈尔 哈尔滨工业大学理学硕士学位论文 哈尔 哈尔滨工业大学理学硕士学位论文 - - PAGE IV - - - PAGE III - Abstract Single chamber solid oxide fuel cell (SC-SOFC) is a novel type fuel cell with only one gas chamber, which is different from other traditional double gas chamber fuel cell. It has many advantages such as free from seal, more simple structure, low operating temperature and various forms of the cell stack, etc. The hydrocarbon fuels mainly used in the previous SOFC research was methane, because methane has the simplest structure among hydrocarbon fuels and the internal reaction is easier to handle. The present thesis mainly researches the characteristic of the cell using polyalkane fuels, such as propane and liquefied petroleum gas (i.e. LPG). Besides, since the by-products from SOFC are high-quality heat, waste heat utilization technologies were also developed, cooperating with a novel unsealed cell stack, to establish a combined heat and power system. Through a series of experiments, cells made of conventional materials were tested in single-chamber conditions under different temperatures and various C3H8 or LPG/O2 gas mixtures. The best working gas ratio of propane to LPG in SC-SOFC was confirmed. When the nitrogen gas flow rate was 100sccm, propane or LPG flow rate was 20sccm, the best performance of a single cell was obtained with propane to oxygen ratio of 0.3, LPG to oxygen ratio of 0.25, respectively. Along with the increase of the oxygen content, the performance of a single cell was improved gradually. This trend was opposite to the cell using methane fuel. Because the fuel cell’s anode catalyzing the partial oxidation reactions in fuel-air mixtures are exothermic reactions. The resulting heat release leads to an increase of the cell temperature which thus deviates from the furnace temperature. For the propane and LPG fuel, this study found the temperature effect more apparent than the cell of methane fuel, which is beneficial to the cell operated at intermediate temperatures. Accord