基于煤颗粒−结合水复合相的水煤浆导热系数预测模型  

Prediction model of thermal conductivity of coal-water slurry based on coal particle-bonded water composite phase

作　　者：蒋海锋 张华驰 赵辉[1,2,3] 许建良[1,2,3] 梁钦锋[1,2,3] 李伟锋[1,2,3] 刘海峰[1,2,3] JIANG Haifeng;ZHANG Huachi;ZHAO Hui;XU Jianliang;LIANG Qinfeng;LI Weifeng;LIU Haifeng(Coal Gasification Engineering and Technology Research Center,East China University of Science and Technology,Shanghai 200237,China;National Research and Development Center for Energy and Coal Gasification Technology,East China University of Science and Technology,Shanghai 200237,China;Engineering Research Center of Resource Utilization of Carbon-containing Waste with Carbon Neutrality,Ministry of Education,East China University of Science and Technology,Shanghai 200237,China;Sinochem Quanzhou Petrochemical Co.,Ltd,Quanzhou 332501,China)

机构地区：[1]华东理工大学上海煤气化工程技术研究中心,上海200237 [2]华东理工大学国家能源煤气化技术研发中心,上海200237 [3]华东理工大学含碳废弃物资源化零碳利用教育部工程研究中心,上海200237 [4]中化泉州石化有限公司,福建泉州332501

出　　处：《煤炭学报》2024年第5期2538-2546,共9页Journal of China Coal Society

基　　金：国家自然科学基金资助项目(21878095);自治区重点研发专项资助项目(2023B01013);大型煤气化技术运行优化及创新升级关键技术研发(山东能源集团)资助项目。

摘　　要：水煤浆气流床气化是目前大型先进煤气化技术之一,提升水煤浆气化效率有助于推动煤炭清洁高效利用。水煤浆预热技术被认为是提高煤气化能源利用效率的关键技术之一。目前,复杂液固悬浮液导热系数的变化规律和内在机理仍未被完全认识。导热系数是介质流动换热的重要基础参数,表征着其在稳态导热过程的导热能力。利用瞬态热线法测定不同温度下相同质量分数水煤浆的导热系数,实验结果表明:温度越高,导热系数越高。在室温下测定不同质量分数下水煤浆的导热系数,实验结果表明可以分为2个阶段:质量分数从51%增大到58%时为下降区,导热系数快速下降,由0.401 W/(m·K)降至0.358 W/(m·K);而质量分数继续增加,从58%到67%时为恒定区,导热系数基本保持在0.358 W/(m·K)。基于实验结果,综合考虑平行模型、麦克斯韦模型、广义自洽模型等复合材料模型,提出煤颗粒−结合水复合的水煤浆导热系数平行预测模型。水煤浆中的水分包含自由水和结合水,结合水会和煤颗粒形成煤颗粒−结合水复合相,将水煤浆视为复合相和自由水相组成的两相复合材料。在下降区,随着煤颗粒质量分数的增加,自由水相减少,复合相不变,水煤浆导热系数快速降低;在恒定区,随着煤颗粒质量分数的进一步增加,复合相中的结合水量减少,但复合相的导热系数基本维持稳定。Coal-water slurry gasification is one of advanced coal gasification technologies.The improvement on the effi-ciency of coal-water slurry gasification is helpful to promote the clean and efficient utilization of coal.Coal-water slurry preheating technology is considered as one of the key technologies to improve the energy utilization efficiency of coal gas-ification.At present,the variation pattern and intrinsic mechanism of thermal conductivity of complex liquid-solid suspen-sions are still not fully understood.The thermal conductivity is an important basic parameter of the medium flow heat transfer,characterizing its thermal conductivity in the steady-state thermal conductivity process.The transient hot wire method is used to measure the thermal conductivity of the same concentration coal-water slurry at different temperatures.The experimental results show that the higher the temperature,the higher the thermal conductivity.The thermal conductiv-ity of coal-water slurry is determined at different mass concentrations with a room temperature.The experimental results show that it can be divided into two stages:the mass concentration increases from 51%to 58%in a drop zone,and the thermal conductivity decreases rapidly,its value decreases from 0.401 W/(m·K)to 0.358 W/(m·K);and the mass con-centration continues to increase from 58%to 67%in a constant zone,and the thermal conductivity basically remains at 0.358 W/(m·K).Based on the experimental results,the parallel prediction model of thermal conductivity of coal-water slurry with coal particle-bonded water composite is proposed by considering the parallel model,Maxwell model,general-ized self-consistent model and other composite models.The water in coal-water slurry contains free water and bound wa-ter,and the bound water will form a coal particle-bound water composite phase with coal particles,and the coal-water slurry is regarded as a two-phase composite composed of the composite phase and the free water phase.In the drop zone,with the increase of coal particle co

关 键 词：水煤浆 质量分数 导热系数 煤水复合模型 结合水 

分 类 号：TK11[动力工程及工程热物理—热能工程]