Sewage sludge separate pyrolysis and co-pyrolysis with low rank coal: Characteristics, kinetics, and mechanism

IF 3.5 2区化学 Q2 CHEMISTRY, ANALYTICAL

Thermochimica Acta Pub Date : 2025-11-01 Epub Date: 2025-08-23 DOI:10.1016/j.tca.2025.180110

Yao Zhang , Congcong Shi , Yugao Wang , Gang Liu , Jun Shen , Yongzhen Yang

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Abstract

Co-pyrolysis of sewage sludge (SS) and low rank coal (DC) is a promising approach for achieving efficient resource utilization. In this study, the pyrolysis characteristics of SS, co-pyrolysis of SS and DC, and their interactions were explored by thermogravimetric analysis (TGA). The effects of pyrolysis temperature, heating rate, and mixing ratio on weight loss, energy changes, and kinetics were investigated. The results indicated the main reaction stage of SS occurred at 180–580 °C, giving an activation energy of 265.91 kJ mol⁻¹ calculated by model-free methods. The co-pyrolysis kinetics using model-fitting method revealed that co-pyrolysis of SS and DC is easier to occur than the case without DC. The synergistic effect between SS and DC is proved. The reaction order decreased, and surface reaction and three-dimensional diffusion reaction existed. 2S2D exhibited the lowest activation energy and reaction order. The paper can provide fundamental data and theoretical guidance for sludge-coal co-pyrolysis.

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污泥与低阶煤分离热解与共热解：特征、动力学及机理

污水污泥（SS）与低阶煤（DC）共热解是实现资源高效利用的一种很有前途的方法。本研究通过热重分析（TGA）探讨了SS的热解特性、SS与DC的共热解特性及其相互作用。考察了热解温度、升温速率和混合比对失重、能量变化和动力学的影响。结果表明，SS的主要反应阶段发生在180 ~ 580℃，通过无模型方法计算得到的活化能为265.91 kJ mol−1。采用模型拟合方法对共热解动力学进行了研究，结果表明SS与DC的共热解比不加DC的情况更容易发生。证明了SS和DC之间的协同效应。反应级数降低，存在表面反应和三维扩散反应。2S2D的活化能最低，反应级数最低。本文可为泥煤共热解研究提供基础数据和理论指导。

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来源期刊

Thermochimica Acta 化学-分析化学

CiteScore

6.50

自引率

8.60%

发文量

210

审稿时长

40 days

期刊介绍： Thermochimica Acta publishes original research contributions covering all aspects of thermoanalytical and calorimetric methods and their application to experimental chemistry, physics, biology and engineering. The journal aims to span the whole range from fundamental research to practical application. The journal focuses on the research that advances physical and analytical science of thermal phenomena. Therefore, the manuscripts are expected to provide important insights into the thermal phenomena studied or to propose significant improvements of analytical or computational techniques employed in thermal studies. Manuscripts that report the results of routine thermal measurements are not suitable for publication in Thermochimica Acta. The journal particularly welcomes papers from newly emerging areas as well as from the traditional strength areas: - New and improved instrumentation and methods - Thermal properties and behavior of materials - Kinetics of thermally stimulated processes