• 论文
主办单位:煤炭科学研究总院有限公司、中国煤炭学会学术期刊工作委员会
基于煤颗粒−结合水复合相的水煤浆导热系数预测模型
  • Title

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

  • 作者

    蒋海锋张华驰赵辉许建良梁钦锋李伟锋刘海峰

  • Author

    JIANG Haifeng;ZHANG Huachi;ZHAO Hui;XU Jianliang;LIANG Qinfeng;LI Weifeng;LIU Haifeng

  • 单位

    华东理工大学 上海煤气化工程技术研究中心华东理工大学 国家能源煤气化技术研发中心华东理工大学 含碳废弃物资源化零碳利用教育部工程研究中心中化泉州石化有限公司

  • Organization
    Coal Gasification Engineering and Technology Research Center, East China University of Science and Technology
    National Research and Development Center for Energy and Coal Gasification Technology, East China University of Science and Technology
    Engineering Research Center of Resource Utilization of Carbon-containing Waste with Carbon Neutrality, Ministry of Education, East China University of Science and Technology
    Sinochem Quanzhou Petrochemical Co., Ltd
  • 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。

  • Abstract

    Coal-water slurry gasification is one of advanced coal gasification technologies. The improvement on the efficiency 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 gasification. At present, the variation pattern and intrinsic mechanism of thermal conductivity of complex liquid-solid suspensions 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 conductivity 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 concentration 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, generalized self-consistent model and other composite models. The water in coal-water slurry contains free water and bound water, 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 concentration, the free water phase decreases, the composite phase remains basically unchanged, and the thermal conductivity of coal-water slurry decreases rapidly. In the constant zone, the amount of bound water in the composite phase decreases with further increase in coal particle concentration, but the thermal conductivity of the composite phase remains basically stable. The model prediction results agree well with the experimental data.

  • 关键词

    水煤浆质量分数导热系数煤水复合模型结合水

  • KeyWords

    water-coal slurry;concentration;thermal conductivity;coal-water composite model;bound water

  • 基金项目(Foundation)
    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
  • DOI
  • 引用格式
    蒋海锋,张华驰,赵辉,等. 基于煤颗粒−结合水复合相的水煤浆导热系数预测模型[J]. 煤炭学报,2024,49(5):2538−2546.
  • Citation
    JIANG Haifeng,ZHANG Huachi,ZHAO Hui,et al. Prediction model of thermal conductivity of coal-water slurry based on coal particle-bonded water composite phase[J]. Journal of China Coal Society,2024,49(5):2538−2546.
  • 图表

    Table1

    煤颗粒样品的元素分析和工业分析
    样品 工业分析 元素分析
    Mad Ad Vd FCd Cd Od Hd Nd Sd
    粗颗粒 2.07 6.09 32.05 61.86 72.51 14.46 4.44 0.95 1.55
    细颗粒 2.30 8.51 30.33 61.16 70.30 14.81 3.74 0.88 1.76

    Table2

    不同粒度级配的60%水煤浆的导热系数
    粒度级配(粗细颗粒比) 导热系数/(W·(m·K)−1)
    全粗颗粒 0.3692
    粗细颗粒比为6∶4 0.3664
    全细颗粒 0.3673
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