Chemical Industry and Engineering Progress ›› 2021, Vol. 40 ›› Issue (8): 4165-4172.DOI: 10.16085/j.issn.1000-6613.2020-1764

• Chemical processes and equipment • Previous Articles     Next Articles

Aspen Plus modeling of the entrained bed coal gasification: equilibrium model and kinetic model

ZHENG Zhihang1(), ZHANG Jiayuan1(), LI Qian2, ZHOU Haoyu2   

  1. 1.School of Energy Science and Engineering, Central South University, Changsha 410083, Hunan, China
    2.National Engineering Research Center of Sintering and Pelletizing Equipment System, Zhongye Changtian International Engineering Co. , Ltd. , Changsha 410205, Hunan, China
  • Received:2020-09-02 Online:2021-08-12 Published:2021-08-05
  • Contact: ZHANG Jiayuan

气流床煤气化的Aspen Plus建模:平衡模型和动力学模型

郑志行1(), 张家元1(), 李谦2, 周浩宇2   

  1. 1.中南大学能源科学与工程学院,湖南 长沙 410083
    2.中冶长天国际工程有限责任公司国家烧结球团装备系统工程技术研究中心,湖南 长沙 410205
  • 通讯作者: 张家元
  • 作者简介:郑志行(1995—),男,硕士研究生,研究方向为煤炭及生物质气化技术。E-mail:zhzheng@csu.edu.cn
  • 基金资助:
    湖南省自然科学基金(2020JJ5994)

Abstract:

The equilibrium model and kinetic model of GE gasifier were established based on Aspen Plus, and the gas composition and carbon conversion were calculated. The model is divided into three stages: pyrolysis, gasification and gas-liquid separation. Among them, the gasification stage is divided into preliminary gasification and gasification reforming, so as to obtain the distribution of gasification products at a constant temperature. The Gibbs reactor RGIBBS is used in the gasification stage of the equilibrium model, and the gasification products in the system are calculated based on the Gibbs free energy minimization principle. The perfect mixing flow reactor RCSTR is used in the gasification stage of the kinetic model, and the gasification products in the system are calculated based on the kinetic mechanism of the coal gasification reaction. The model results are compared with the actual engineering data of GE gasifier, and the results show that the equilibrium model can reflect the change trend of gasification results to some extent, but the accuracy of the prediction results is not enough, while the kinetic model based on gasification reaction mechanism can well predict the gasification results of GE gasifier. The reaction time is set for the perfect mixing flow reactor in the kinetic model, which can provide some guidance for the production of GE gasifier. The results show that a good gasification effect can be achieved when the reaction residence time is 3.5s. Temperature is an important factor affecting the gasification reaction rate and product distribution. The influence of gasification temperature on gas composition and carbon conversion is simulated by the kinetic model of coal gasification. The results show that with the increase of gasification temperature, the CO content increases, the H2 content is basically the same, the CO2 content decreases, and the carbon conversion increases.

Key words: Aspen Plus, GE gasifier, equilibrium model, kinetic model, reaction residence time, temperature

摘要:

基于Aspen Plus软件建立了GE气流床煤气化的平衡模型和动力学模型,计算了气化的煤气组成和碳转化率。模型分为热解、气化和气液分离三个阶段。其中,气化阶段又分为初步气化和气化重整,从而获得气化产物在恒定温度下的分布。平衡模型的气化阶段使用了吉布斯反应器RGIBBS,基于吉布斯自由能最小化原理对体系内的气化产物进行计算;动力学模型的气化阶段使用了全混流反应器RCSTR,基于煤气化反应的动力学机理对体系内的气化产物进行计算。模拟值与GE气化炉的实际工程数据进行了对比,结果表明,平衡模型可在一定程度上反映气化结果的变化趋势,但预测结果的准确性有所欠缺,而基于气化反应机理建立的动力学模型能很好地预测GE气化炉的气化结果。对动力学模型中的全混流反应器进行反应时间设定,可以对GE气化炉生产提供一定的指导,结果表明:反应停留时间为3.5s时就可以达到很好的气化效果。温度是影响气化反应速率及产物分布的重要因素,利用煤气化的动力学模型模拟了气化温度对气体组成及碳转化率的影响,结果表明:随着气化温度的升高,CO含量逐渐增加,H2含量基本不变,CO2含量逐渐减小,碳转化率逐渐升高。

关键词: Aspen Plus, GE气化炉, 平衡模型, 动力学模型, 反应停留时间, 温度

CLC Number: 

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