半焦与城市污泥混合物的燃烧性能研究

Study on combustion performance of semi-coke and municipal sludge mixture

采用热重分析法研究了半焦与城市污泥混合物的燃烧性能,揭示了半焦添加量对城市污泥燃烧性能的影响规律,为基于半焦的污泥调质与机械脱水污泥的高效能源化利用提供理论支持与依据。结果表明:城市污泥的着火温度低,容易燃烧,但其灰分高,燃烧速率慢,燃烧性能差;云南褐煤热解半焦的着火温度比城市污泥高,着火相对困难,但其燃烧速率快,燃烧性能好;随半焦配比的增大,半焦与城市污泥混合物的燃烧性能变好,说明半焦能改善城市污泥的燃烧性能,当半焦配比大于40%(质量分数)时,半焦与城市污泥混合物的微商热重曲线呈单峰,有较好的燃烧性能。

In order to reveal the effect of semi-coke addition on the combustion characteristics of municipal sludge, the combustion performance of semi-coke and municipal sludge mixture had been investigated by thermogravi- metric analysis,which provided theoretical support and possibility for the efficient utilization of municipal sludge con- ditioned by semi-coke. The results showed that municipal sludge had lower ignition temperature, and were easy to burn. However, the burning velocity and combustion performance of municipal sludge was poor because of its high ash content. The ignition temperature of semi-coke which derived from pyrolysis of Yunnan lignite was higher than that of municipal sludge,but its combustion velocity was high and the comprehensive combustion performance of semi-coke was better. The combustion performance of semi-coke and municipal sludge mixture became better with the increase of the ratio of semi-coke, which suggested that the combustion performance of municipal sludge could be improved by semi-coke. When the mass ratio of semi-coke greater than 40% ,the combustion fingerprint curve of the mixture dis- played a single peak,which indicated that it had better combustion performance.