二次气流对分级气流床气化炉气化特性的影响
首发时间:2011-03-25
摘要:气流床分级给氧气化技术是我国具有自主知识产权的煤气化技术。本文应用fluent软件对某分级气流床气化炉进行仿真研究,计算中采用Realization K-e模型对湍流模型进行封闭,非预混平衡化学反应的模拟方法来描述炉内的化学反应并预测蒸发相的燃烧,离散相模型来模拟气体流动与水煤浆燃料喷射的耦合作用,两步竞争方程模型描述挥发分的析出过程,用动力学/扩散控制反应速率模型考虑焦炭燃烧反应;本文主要研究了二次给氧速度变化时气化炉出口温度、CO、H2O、CO2、H2等主要气体成分的变化情况。模拟结果和工业运行数据相一致,为实现此类气化炉的优化控制提供了技术指导。
关键词: 分级气流床气化炉 二次气流速度 燃烧反应 气化特性 仿真研究
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Effect of Second Airflow on Gasification Performance in a Staged Entrained Flow Gasifier
Abstract:Grading-oxygen-supply entrained flow gasification which has owned proprietary intellectual property rights is integrated coal gasification technology in our country. Based on CFD software Fluent, computer simulation was conducted on a staged entrained flow Gasifier. The realizable k-ε turbulent model was used. Chemical process was described with Modeling Approaches for Non-Premixed Equilibrium Chemistry and gas phase combustion was Predicted. The coupling effect between gas phase floating and the slurry injection was considered by using discrete phase mode. Double equation model dynamic diffusion combustion model and was adopted to describe volatile matter and carbon combustion respectively. In this paper,change of temperature in the outlet of gasifer and distribution of CO,H2,CO2 and H2O mole fraction along with different secondary oxygen speed was mainly studied. Simulation results and industrial operation data are basically consistent. This would provide production and technical guidance for the optimization control of the gasifier in the future.
Keywords: a staged entrained flow gasifier velocity of second airflow combustion reaction gasification performance simulation research
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