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Process modelling of two-stage entrained-bed gasification composed of rapid pyrolysis and gasification processes

机译：两阶段夹带床气化组成的过程建模，包括快速热解和气化过程

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摘要

A novel two-stage entrained-bed gasification system composed of the rapid pyrolysis of pulverized coal and the gasification of char is proposed to obtain high-quality synthetic gas with low tar content and high methane content. A new framework containing a modified multi-step kinetic pyrolysis model and a non-linear programming (NLP) process is developed to simulate the rapid pyrolysis process of pulverized coal. The method can be used to simulate the volatile composition, which includes only the high-weight hydrocarbons/distillable liquids (benzene, toluene, xylene, naphthalene, pyrene, phenol) based on the proximate and ultimate analysis data of coal. The framework for coal rapid pyrolysis and the simulation of the two-stage entrained-bed gasification are validated by experimental data and semi-industrial data, respectively. This paper analyses the effects of the final pyrolysis temperature, the gas residence time, and the steam/coal ratio on the performance of the two-stage entrained-bed gasification system. The results indicate that by adjusting the gas residence time to 15.5 s at the final pyrolysis temperature of 1000 degrees C, the tar yield can be reduced to less than 500 mg/Nm(3), the molar fraction of methane in the syngas can be approximately 5.84%, the exit temperature can be approximately 943 degrees C, and the higher heating value (HHV) of syngas and the cold gas efficiency (CGE) will be 11.41 MJ/(Nm(3)) and 91.23%, respectively.
机译：提出了一种新型的两级夹带床气化系统，由粉煤的快速解析和焦炭气化的气化组成，以获得具有低焦油含量和高甲烷含量的高质量合成气。开发了一种包含改进的多步动力学热解模型和非线性编程（NLP）工艺的新框架以模拟粉煤的快速热解过程。该方法可用于模拟挥发性组合物，其仅基于煤的近似和最终分析数据，仅包括高重量烃/可蒸液（苯甲酸稀液（苯，甲苯，二甲苯，萘），芘，苯酚）。通过实验数据和半工业数据验证了煤的快速热解和两级夹带床气化模拟的框架。本文分析了最终热解温，气体停留时间和蒸汽/煤比对两级夹带床气化系统的性能的影响。结果表明，通过在最终热解温度为1000℃的最终热解温度下调节气体停留时间至15.5秒，可以将焦油产率降低至小于500mg / nm（3），合成气中甲烷的摩尔分数可以是大约5.84％，出口温度可约为943℃，合成气的较高的加热值（HHV）和冷气效率（CGE）分别为11.41MJ /（NM（3））和91.23％。

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  • 来源
    《Fuel》 |2020年第15期|116531.1-116531.12|共12页
  • 作者

    Gao Rui; Huang Bo; Huang Jian; Xu Jianliang; Dai Zhenghua; Wang Fuchen;

  • 作者单位

    East China Univ Sci & Technol Shanghai 200237 Peoples R China;

    East China Univ Sci & Technol Shanghai 200237 Peoples R China;

    East China Univ Sci & Technol Shanghai 200237 Peoples R China;

    East China Univ Sci & Technol Shanghai 200237 Peoples R China;

    East China Univ Sci & Technol Shanghai 200237 Peoples R China;

    East China Univ Sci & Technol Shanghai 200237 Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Two-stage; Entrained-bed gasification; Rapid pyrolysis; Tar; Framework;

    机译：两阶段;夹带床气化;快速热解;焦油;框架;

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