Characteristics of Multi-phase Flow Reactors

提出了一种新型的煤气化炉反应器，在一个大气压和800℃左右的较低温度下运行，以100%的转化率产生富氢气体。它是一种带有引水管的喷淋床，上面装有热介质循环系统。这个反应堆有以下优点：1)气化区以塞流为主，2)不需要对进料煤颗粒进行分类，3)可以用空气代替氧气。通过冷模型的基础实验，确定了热模型的标准操作条件。每次运行时，在出口气体中都能识别出50%或更多的氢。在煤的进料速率为0.21g/s时，煤的蒸汽气化产生约560 cc-NTP/s的气体。氢气、一氧化碳和二氧化碳是主要的生产气体。产生了少量甲烷。在气化过程中未检测到焦油。采用城市水-空气和城市水-氧气两种系统，研究了高质量气液混合用振动混合器的反应器特性。澄清了反应器进气速率和频率数对轴向有效扩散系数和气液界面传质体积系数的影响，表明反应器具有与气泡塔几乎相同的良好混合性能。

A novel reactor for coal gasifier operated under one atmospheric pressure and comparatively low temperatures around 800ﾟC was proposed to produce hydrogen-rich gases at 100% conversion. That is a spouted bed with draft tube being provided with the circulating system of thermal medium. This reactor has the following favorable points ; 1) plug flow is predominant in the gasification zone, 2) classification of feed coal particles is not necessary and 3) air can be used instead of oxygen. Through the fundamental experiments of a cold model, the standard operating conditions for a hot model were determined. Fifty or more percent hydrogen was recognized at the exit gas for every run.About 560 cc-NTP/s gased occurred through the gasification of coal with steam at coal feed rate=0.21g/s. hydrogen, carbon monoxide and carbon dioxide were main production gases. A small amount of methane was produced. No tars were detected during the gasification process.Reactor charateristics of Vibro-mixer (a having high quality for gas-liquid mixing) were investigated by using two systems such as city water-air and city water-oxygen. The effects of gas feed rate and frequency number of the reactor on axial effective diffusion coefficients and volumetric coefficients of mass transfer between gas liquid interface were clarified to show the almost same good mixing performance as the bubble column.