Review for research of flow, mixing and reaction process in entrained flow coal gasifier
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摘要: 气流床气化过程涉及高温高压下湍流多相流动与复杂化学反应过程的相互作用,涵盖喷嘴雾化与弥散、复杂多相射流流动、炉内湍流混合、复杂气化反应、火焰结构及温度分布等诸多方面,是世界各国研究的热点.对近年来世界各国在气流床气化过程研究上取得的进展进行了综述,包括喷嘴雾化与颗粒弥散机理与雾化过程的影响因素、撞击流驻点偏移规律和撞击面振荡规律、撞击火焰结构与炉内三维温度场、典型煤种气化反应特性与石油焦气化特性以及气流床气化过程模拟.对气流床气化过程未来的研究重点进行了展望.Abstract: Entrained flow gasification process involves turbulent multiphase flow and the interaction of complex chemical reaction process at high temperature and pressure, covering the nozzle atomization and dispersion, complex multiphase jet flows, turbulent mixing, complex gasification reaction, flame structure and its temperature distribution and many other aspects. It is a very important research focus. In this paper, the research progress of entrained flow gasification process, which had been made in recent years, were reviewed, including the atomization mechanism of coal-water-slurry nozzle, the particle dispersion mechanism of pulverized coal nozzle, the rule of stagnation point offset of opposed impinging stream, oscillation of the impingement plane, the pattern of opposed impinging flame structure and its three-dimensional temperature field, the gasification characteristics of the typical coal and petroleum coke, and the simulation for entrained flow gasifier. It is also discussed about the research priorities of entrained flow gasification process in future.
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