市政污泥干化热解工艺分析与热平衡模型的构建
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摘要
建立了一种工艺流程高度集成的污泥干化热解处理系统,并在污泥成分分析、污泥热解过程参数测定的基础上,基于能量守恒定律,分析了该系统的干化、污泥热解、热解气燃烧过程全系统的能量转换、传递和耗散过程,最终构建了数学模型;利用该模型求得了燃料消耗量与污泥初始含水率和污泥处理量间的线性回归方程,分别为:y=-12.17+0.278 9x(x为含水率)和y=0.010 2x(x为污泥处理量)。试验表明线性回归方程的误差较小,可为污泥热解技术的工业化和集成化提供了可靠的运行参数。
A highly integrated pyrolysis system was set up, including sludge drying and pyrolysis process. The sludge composition was analyzed and pyrolysis process parameters were measured. Based on the law of conservation of energy, and analyzing the energy conversion, transfer, and dissipation of the drying, carbonization, and pyrolysis gas combustion processes in the integrated sludge pyrolysis system, a mathematical model was composed. With the mathematical model, the relationships between the auxiliary fuel consumption and the initial water content of the sludge and the treated sludge amounts were established. Experiments show that the linear regression equation has less error, which provides a reliable operating parameter for the industrialization and integration of the sludge pyrolysis technology.
A highly integrated pyrolysis system was set up, including sludge drying and pyrolysis process. The sludge composition was analyzed and pyrolysis process parameters were measured. Based on the law of conservation of energy, and analyzing the energy conversion, transfer, and dissipation of the drying, carbonization, and pyrolysis gas combustion processes in the integrated sludge pyrolysis system, a mathematical model was composed. With the mathematical model, the relationships between the auxiliary fuel consumption and the initial water content of the sludge and the treated sludge amounts were established. Experiments show that the linear regression equation has less error, which provides a reliable operating parameter for the industrialization and integration of the sludge pyrolysis technology.
引文
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[2] FYTILI D,ZABANIOTOU A.Utilization of sewage sludge in EU application of old and new methods——A review[J].Renewable and Sustainable Energy Reviews,2008,12 (1):116-140.
[3] 崔若琦.污泥焚烧烟气中细颗粒物与重金属交互作用机理[D].沈阳:沈阳航空航天大学,2017.
[4] 方平,唐子君,钟佩怡,等.城市污泥焚烧渣中重金属的浸出特性[J].化工进展,2017,36(6):2304-2310.
[5] 袁言言,黄瑛,张冬,等.污泥焚烧能量利用与污染物排放特性研究[J].动力工程学报,2016,36(11):934-940.
[6] 庞赟佶,王宏东,陈义胜,等.城市干污泥热解气化[J].环境工程学报,2017,11(11):6022-6027.
[7] 高豪杰,熊永莲,金丽珠,等.污泥热解气化技术的研究进展[J].化工环保,2017,37(3):264-269.
[8] 叶江明,潘其文,张会岩.内循环串行流化床生物质催化热解试验研究[J].动力工程学报,2011,31(3):220-226.
[9] 管志超,胡艳军,钟英杰.不同升温速率下城市污水污泥热解特性及动力学研究[J],环境污染与防治,2012,34(3):35-39.
[10] 熊思江,章北平,冯振鹏,等.湿污泥热解制取富氢燃气影响因素研究[J].环境科学学报,2010,30(5):996-1001.
[11] 姬爱民,张书廷,徐晖,等.污泥热解油中类汽油组分组成和燃料特性分析[J].燃料化学学报,2010,39(3):194-197.
[12] ISCHIA M,PERAZZOLLI C,MASCHIO R D,et al.Pyrolysis study of sewage sludge by TG-MS and TG-GC-MS coupled analysis[J].Journal Thermal Analysis and Calorimetry,2007,87(2):567-574.
[13] ISABEL F,ALFONSO J,GLORIA G,et al.Sewage sludge pyrolysis in fluidized bed:Influence of operational conditions on the product distribution[J].Industrial & Engineering Chemistry Research,2008,47(15):5376-5385.