{"title":"On the co-combustion characteristics and kinetics of sludge, wood chips, and bituminous coal","authors":"","doi":"10.1016/j.cherd.2024.08.006","DOIUrl":null,"url":null,"abstract":"<div><p>Combustion with coal is an effective sludge disposal method, but it may weaken the combustion performance of coal. Mixing with biomass can improve the combustion characteristics of the coal-sludge mixture, yet the co-combustion kinetics remain to be studied. The combustion characteristics of sludge, wood chips (WC), and bituminous coal (BC) and their mixtures were investigated by TGA. Mixing 20 wt% sludge reduced the comprehensive combustion characteristic index (S) of BC. However, introducing WC offsets this weakening. The ignition temperature of the mixtures decreased from 430.5 to 274.0 °C, and the S indexes increased, indicating that WC enhances the combustibility of the mixtures. The optimum ratio of WC, sludge and BC blended for combustion was determined experimentally, resulting in the best ignition performance and the largest S index. The kinetic model of BC was represented by the Johnson-Mehl-Avrami (JMA) model. By adding 2–4 wt% WC, the kinetic models of mixtures shifted from JMA to the unimolecular decay law (F1) model and then to the phase boundary-controlled reaction (R3) model at 6 wt% WC content.</p></div>","PeriodicalId":10019,"journal":{"name":"Chemical Engineering Research & Design","volume":null,"pages":null},"PeriodicalIF":3.7000,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Chemical Engineering Research & Design","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0263876224004738","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}
引用次数: 0
Abstract
Combustion with coal is an effective sludge disposal method, but it may weaken the combustion performance of coal. Mixing with biomass can improve the combustion characteristics of the coal-sludge mixture, yet the co-combustion kinetics remain to be studied. The combustion characteristics of sludge, wood chips (WC), and bituminous coal (BC) and their mixtures were investigated by TGA. Mixing 20 wt% sludge reduced the comprehensive combustion characteristic index (S) of BC. However, introducing WC offsets this weakening. The ignition temperature of the mixtures decreased from 430.5 to 274.0 °C, and the S indexes increased, indicating that WC enhances the combustibility of the mixtures. The optimum ratio of WC, sludge and BC blended for combustion was determined experimentally, resulting in the best ignition performance and the largest S index. The kinetic model of BC was represented by the Johnson-Mehl-Avrami (JMA) model. By adding 2–4 wt% WC, the kinetic models of mixtures shifted from JMA to the unimolecular decay law (F1) model and then to the phase boundary-controlled reaction (R3) model at 6 wt% WC content.
期刊介绍:
ChERD aims to be the principal international journal for publication of high quality, original papers in chemical engineering.
Papers showing how research results can be used in chemical engineering design, and accounts of experimental or theoretical research work bringing new perspectives to established principles, highlighting unsolved problems or indicating directions for future research, are particularly welcome. Contributions that deal with new developments in plant or processes and that can be given quantitative expression are encouraged. The journal is especially interested in papers that extend the boundaries of traditional chemical engineering.