化工学报2017，Vol.68Issue(11)：4079-4087,9.DOI:10.11949/j.issn.0438-1157.20161774
一种快速冷却超高温流体方法的数值模拟
Simulation for a novel method to quench super-high temperature fluid
摘要
Abstract
There are many strong endothermic chemical reactions achieved by super-high temperature, they need quickly quenching to avoid reverse reaction for obtaining substantial yield. Based on our experiments of CO2 pyrolysis by thermal plasma, where a non-conventional quenching was achieved with setting a converging nozzle at the exit of reactor to lead the pyrolysis gas at high speed into cooling tube, the reverse reaction CO+O=CO2 was unusually suppressed and very high CO2 conversion was achieved. To understand the mechanism of the novel quench phenomena, a CFD Simulation was carried out. It verified that a quenching rate of 107K·s?1could be expected, but the quench phenomena cannot be understood only by gas dynamics principle. A deep analysis on simulation revealed that converging nozzle resulted in viscous fluid strong rotating eddy in the cooling tube, it is the strong rotating eddy that enhance greatly both of the fluid entrainment into body jet and the forced heat transfer of the fluid at the cooling tube before entrainment.关键词
气体动力学/收缩型喷嘴/急冷机制/数值模拟/计算流体力学Key words
gas dynamics/converging nozzle/quenching/numerical simulation/CFD分类
化学化工引用本文复制引用
冉唐春,杨涛,陈攀,李娇,印永祥..一种快速冷却超高温流体方法的数值模拟[J].化工学报,2017,68(11):4079-4087,9.基金项目
国家自然科学基金项目(11375123).supported by the National Natural Science Foundation of China (11375123). （11375123）
