ABSTRACT

In this paper, fuel composition and efficiency of solid oxide fuel cell with different methanol pretreating technologies are investigated. High concentrations of H₂ and CO can be produced by methanol pretreatment at high temperature, whereas high concentration of methane can be produced at low temperature under the thermodynamic equilibrium condition. For steam reforming of methanol, high cell efficiency can be obtained, whereas for partial oxidation of methanol, the cell efficiency decreases most obviously compared with other pretreating technologies with the increase of O/C ratio. When the O/C ratio is 1.5, the cell efficiencies are 55.89% for steam reforming of methanol, 50.83% for autothermal reforming of methanol, and 45.77% for partial oxidation of methanol at 80% equivalent fuel utilization and 1073 K. When the O/C ratio increases to 2.5, the cell efficiency decreases slowly to 52.01% for steam reforming of methanol, whereas rapidly to 21.68% for partial oxidation of methanol at 80% equivalent fuel utilization and 1073 K. According to the calculated results under the thermodynamic equilibrium condition, suitable pretreating technology and O/C ratio for methanol pretreatment can be selected for the operation of solid oxide fuel cell, which can lead to the high efficiency and good stability of solid oxide fuel cell.

摘要

本文研究了采用不同甲醇预处理技术的固体氧化物燃料电池的燃料成分和效率。高浓度 H ₂甲醇预处理在高温下可以产生CO，而在热力学平衡条件下，低温下可以产生高浓度的甲烷。甲醇蒸汽重整可获得较高的电池效率，而甲醇部分氧化则随着O/C比的增加，电池效率较其他预处理技术下降最为明显。当 O/C 比为 1.5 时，在 80% 等效燃料利用率和 1073 K 条件下，甲醇蒸汽重整的电池效率为 55.89%，甲醇自热重整为 50.83%，甲醇部分氧化效率为 45.77%。当 O /C 比增加到 2.5，对于甲醇的蒸汽重整，电池效率缓慢下降到 52.01%，而迅速下降到 21。