【摘要】 研究了热解工艺参数和污泥理化性质对热解残渣特性的影响,着重分析了不同热解工艺参数和污泥理化性质下,污泥热解残渣的吸附性能与内部孔结构.研究表明,当热解终温Tend在300℃—550℃之间,污泥热解残渣的碘值在450℃时最大,亚甲基蓝值在500℃时最小.热解残渣的碘值随着RT的延长先增大,当停留时间RT=75 min时达到最大值;亚甲基蓝值的最小值随着RT的延长逐渐往低温区移动.污泥热解残渣的碘值随着升温速率β的增大而减小,无论Tend的高低,亚甲基蓝值的最小值都出现在β=3℃.min-1.污泥热解残渣的比表面积随着颗粒粒径d的增大迅速减小,但d对残渣吸附性能的影响却不大.当含水率M=10%—40%,热解残渣的吸附性能基本不受M的影响;继续提高含水率,热解残渣的碘值迅速减小,而亚甲基蓝值却随M的增大而增大.Tend为450℃、RT为75 min和β为3℃.min-1是较佳的污泥热解工艺参数.更多还原

【Abstract】 The optimum pyrolysis parameters of the sewage sludge were identified in terms of end temperature Tend,retention time RT,heating rate β and sewage sludge physicochemical properties;meanwhile,the adsorbability and pore structure of the pyrolysis char products were analyzed under different pyrolysis parameters.It was found that iodine value of the char reached a maximum at Tend of 450 ℃ while its methylene blue adsorption reached a minimum at Tend of 500 ℃.Iodine value increased first with RT and then reached a maximum at RT=75 min while the minimum of methylene blue adsorption gradually moved to the low temperature zone with RT.Iodine value decreased with heating rate β while the minimum of methylene blue adsorption occurred at β of 3 ℃·min-1 regardless of Tend level.The specific surface area decreased rapidly with particle size d,but d had a little effect on adsorbability.A moisture content M of 10% to 40% did not affect largely on adsorbability of the char,and further increase in M led to a significant reduction in iodine value and an increase of methylene blue adsorption.Tend of 450 ℃,RT of 75 min and β of 3 ℃·min-1 proved to be the optimum pyrolysis parameters.更多还原