CIESC Journal ›› 2023, Vol. 74 ›› Issue (1): 428-437.DOI: 10.11949/0438-1157.20221131

• Fluid dynamics and transport phenomena • Previous Articles     Next Articles

Study of EDC parameters for predicting entrained flow coal gasification

Peng QIU1(), Yang HAN1, Jianliang XU1, Fuchen WANG1, Zhenghua DAI1,2()   

  1. 1.Institute of Clean Coal Technology, East China University of Science and Technology, Shanghai 200237, China
    2.School of Chemical Engineering and Technology, Xinjiang University, Urumqi 830046, Xinjiang, China
  • Received:2022-08-11 Revised:2022-11-17 Online:2023-03-20 Published:2023-01-05
  • Contact: Zhenghua DAI

用于预测气流床煤气化的EDC模型参数研究

仇鹏1(), 韩洋1, 许建良1, 王辅臣1, 代正华1,2()   

  1. 1.华东理工大学洁净煤技术研究所,上海 200237
    2.新疆大学化工学院,新疆 乌鲁木齐 830046
  • 通讯作者: 代正华
  • 作者简介:仇鹏(1987—),男,博士研究生,讲师,y10180283@mail.ecust.edu.cn
  • 基金资助:
    上海科技创新行动计划项目(21DZ1209003);上海市优秀技术带头人项目(19XD1434800);国家自然科学基金项目(21776087)

Abstract:

The entrained flow coal gasifier is a multi-phase turbulent reactor accompanied by homogeneous reaction processes such as combustion and transformation, which can be simulated by eddy dissipation concept (EDC) model for turbulence-chemical reaction interaction, but the model parameters need to be corrected. The effects of EDC model parameters on syngas temperature and composition were investigated by analyzing the parameter modification range of EDC model for gasifier under Realizable κ-ε condition with a 1500 t/d opposed multi-burner (OMB) coal-water slurry (CWS) gasifier. Four groups of EDC models with different parameters and (finite-rate/eddy-dissipation) ED model was numerically investigated and verified with the outlet industrial data. The results showed that when CD1=0.213,0.272≤CD2≤2.268. After modification of the model constants in this range, the relative errors of temperature, CO and H2 volume fraction at the outlet were lower than original value, and the minimum were -2.54%, -3.93%, and 0.74%, respectively, while those of the ED model were 7.95%, 5.52% and -2.74%, respectively. The temperature and composition results of the EDC simulation with default parameters are always within the range of the boundary parameter model, and the range becomes narrower closer to the gasifier outlet, and the simulation results of each model tend to be consistent.

Key words: entrained flow reactor, opposed multi-burner, slurry, gasification, numerical simulation

摘要:

气流床煤气化炉是多相湍流反应器,伴随燃烧、变换等均相反应过程,可由eddy dissipation concept(EDC)模型模拟湍流-化学反应相互作用,但需修正模型参数。以1500 t/d多喷嘴对置水煤浆气化炉为对象,分析了Realizable κ-ε条件下气化炉EDC模型的参数修正范围,考察了EDC模型参数对合成气温度和组成的影响。结果表明,当CD1=0.213时,0.272≤CD2≤2.268。在此范围修正EDC模型参数,气化炉出口温度、CO和H2体积分数相对误差比修正前降低,最小可分别达到-2.54%、-3.93%和0.74%,模型修正范围可靠。默认参数的EDC模拟温度和组成结果始终处于边界参数模型范围内,且该范围越靠近气化炉出口越窄,各模型模拟结果趋于一致。

关键词: 气流床, 多喷嘴, 浆料, 气化, 数值模拟

CLC Number: