Abstract To achieve an efficient large-scale use of the coal tar residue (CTR), a microwave-assisted hydrothermal treatment was investigated to reduce its viscosity. The CTR was treated at various temperature with various liquid/solid (L/S) ratio by microwave-assisted hydrothermal. Then the thermogravimetry (TG) and the tube furnace combustion experiment were employed to study the combustion behavior and the NOx and SO2 emissions of the treated CTR. The results indicated that the microwave-assisted hydrothermal treatment with higher temperature and higher L/S ratio was beneficial to the viscosity reduction of the CTR. The TG results suggested that the treated CTR achieved a complete combustion only at a heating rate of 10 °C/min. Moreover, increasing the temperature and the L/S ratio reduced the comprehensive combustion characteristic index of the treated CTR. The results of combustion experiment indicated that the NOx emission of the treated CTR was less than 140 mg·m−3, while the SO2 emission was less than 100 mg·m−3. The microwave-assisted hydrothermal treatment is a promising method for the CTR, and the treated CTR can be applied as the fuel of circulating fluid beds (CFB) for industrial production.

中文翻译：

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微波辅助水热处理处理煤焦油渣的特性

摘要 为了实现煤焦油渣（CTR）的高效大规模利用，研究了微波辅助水热处理以降低其粘度。通过微波辅助水热法在不同温度下以不同的液/固 (L/S) 比对 CTR 进行处理。然后采用热重法（TG）和管式炉燃烧实验研究处理后的 CTR 的燃烧行为和 NOx 和 SO2 排放。结果表明，较高温度和较高L/S比的微波辅助水热处理有利于CTR的降粘。TG 结果表明，经过处理的 CTR 仅在 10 °C/min 的加热速率下实现完全燃烧。而且，升高温度和L/S比降低了处理后CTR的综合燃烧特性指数。燃烧实验结果表明，处理后的CTR的NOx排放量小于140 mg·m-3，而SO2排放量小于100 mg·m-3。微波辅助水热处理是一种很有前景的CTR方法，处理后的CTR可作为循环流化床（CFB）的燃料用于工业生产。