Co-firing of coal gangue and sewage sludge: Combustion characteristics and ash fusion behavior

IF 7.9 2区环境科学与生态学 Q1 ENGINEERING, CHEMICAL

Process Safety and Environmental Protection Pub Date : 2026-07-15 Epub Date: 2026-07-04 DOI:10.1016/j.psep.2026.109232

Yasen Wu, Li Zhang, Zhengzhi Zhang, Weidong Zhang, Zhiping Lei, Zhanku Li, Shibiao Ren, Zhicai Wang, Hengfu Shui, Jingchong Yan

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Abstract

This study investigated the co-combustion characteristics and ash fusion behavior of sewage sludge (SS) and coal gangue (CG). SS addition promoted CG ignition and burnout during co-combustion, and the synergy factor reached 1.49 for the blends composed of 40% CG and 60% SS by weight (40CG60SS). Notably, as the SS blending ratio increased from 20% to 80%, the ash flow temperature (FT) of the CG-SS blended ashes increased by 134 °C. Thermodynamic calculations with FactSage verified the increase of the predicted liquidus temperature by 240 °C. FTIR and NBO/T analyses indicated that phosphorus in SS promoted repolymerization of the aluminosilicate network, thereby weakening the depolymerizing effect of alkaline oxides and suppressing low-melting phases formation. These findings suggest that co-firing SS can improve CG combustion performance while mitigating ash slagging risks.

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煤矸石与污泥共烧：燃烧特性与灰熔融行为

研究了污水污泥（SS）与煤矸石（CG）的共燃特性及灰熔融行为。在共燃过程中，添加SS对CG起燃和燃尽有促进作用，在重量比为40% CG和60% SS的共混体系（40CG60SS）中，协同因子达到1.49。值得注意的是，随着SS掺量从20%增加到80%，CG-SS掺合灰的灰流温度（FT）提高了134 ℃。利用FactSage进行的热力学计算证实，预测的液相温度提高了240 °C。FTIR和NBO/T分析表明，SS中的磷促进了铝硅酸盐网络的再聚合，从而削弱了碱性氧化物的解聚作用，抑制了低熔点相的形成。这些结果表明，共烧SS可以提高CG燃烧性能，同时降低灰结渣风险。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Process Safety and Environmental Protection 环境科学-工程：化工

CiteScore

11.40

自引率

15.40%

发文量

929

审稿时长

8.0 months

期刊介绍： The Process Safety and Environmental Protection (PSEP) journal is a leading international publication that focuses on the publication of high-quality, original research papers in the field of engineering, specifically those related to the safety of industrial processes and environmental protection. The journal encourages submissions that present new developments in safety and environmental aspects, particularly those that show how research findings can be applied in process engineering design and practice. PSEP is particularly interested in research that brings fresh perspectives to established engineering principles, identifies unsolved problems, or suggests directions for future research. The journal also values contributions that push the boundaries of traditional engineering and welcomes multidisciplinary papers. PSEP's articles are abstracted and indexed by a range of databases and services, which helps to ensure that the journal's research is accessible and recognized in the academic and professional communities. These databases include ANTE, Chemical Abstracts, Chemical Hazards in Industry, Current Contents, Elsevier Engineering Information database, Pascal Francis, Web of Science, Scopus, Engineering Information Database EnCompass LIT (Elsevier), and INSPEC. This wide coverage facilitates the dissemination of the journal's content to a global audience interested in process safety and environmental engineering.