Influence of hydrothermal carbonized sewage sludge on coal water slurry performance  

作　　者：Asma Leghari Yao Xiao Lu Ding Hammad Sadiq Abdul Raheem Guangsuo Yu 

机构地区：[1]Institute of Clean Coal Technology,East China University of Science and Technology,Shanghai 200237,China [2]Engineering Research Center of Resource Utilization of Carbon-containing Waste with Carbon Neutrality,Ministry of Education,Shanghai 200237,China [3]School of Mechanical and Power Engineering,East China University of Science and Technology,Shanghai 200237,China [4]Energy and Bioproducts Research Institute(EBRI),Aston University,Birmingham,B47ET,UK [5]State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering,Ningxia University,Yinchuan 750021,China

出　　处：《Frontiers of Chemical Science and Engineering》2025年第1期107-120,共14页化学科学与工程前沿(英文版)

摘　　要：Coal utilization,as a major energy source,raises sustainability concerns and environmental impacts,prompting researchers to explore blending it with other feedstocks.This study discusses hydrochar coal-water slurry(HC-CWS)preparation conditions,emphasizing apparent viscosity and exploring the influence of high ash content on char reactivity.The study highlights that the presence of free water in sludge is moderately influential,while high amounts of free water in raw sewage sludge(SS)and its near absence during hydrothermal carbonization(HTC)of SS are both unfavorable for enhancing the overall performance of coal-water slurry(CWS).HTC reduces the concentration of hydroxyl functional group,enhancing slurry performance and reducing ash content in HC-CWS,indicating that coal complements hydrochar(HC).High-temperature HC preparation is unsuitable for HC-CWS due to increased viscosity and decreased stability.In terms of ash content,the optimal pH and HC ratio for CWS are determined at 30%HC.The gasification reactivity of HC,prepared at 180°C with a 30%HC ratio in CWS at R0.5 is 6×10^(−3) and at R0.9 is 9×10^(−3).However,increasing HC to 50%diminishes reactivity under CO_(2) atmosphere.The inhibitory effect was observed with an increasing percentage of HC in CWS and the synergy factor decreased in the following order:10%HC>30%HC>50%HC,i.e.,from 1.04 to 0.35.The possible reason is the presence of high ash content and their similar initial gasification rates during its early stages.

关 键 词：hydrochar coal water slurry high ash content slurry properties gasification reactivity 

分 类 号：X70[环境科学与工程—环境工程]