煤矿乏风瓦斯流入特性对填充床内置换热器取热的影响

发布时间：2018-04-09 11:23

本文选题：乏风瓦斯　切入点：流入特性　出处：《煤炭学报》2017年03期

【摘要】：在实验验证数学模型有效基础上,研究了气体流入特性对煤矿乏风氧化床内置换热器取热的影响,结果表明:填充床内置换热器取热率随床层入口气体质量流速均匀性指数的下降而减小,蜂窝陶瓷的存在导致气体流动单向导通、增大床层物理流速及辐射面积,使床层入口气体质量流速均匀性指数减幅相同时填充床内置换热器取热率减小幅度要比空床换热器大;床层入口气体平均质量流速不变时,内置热器取热率随床层入口气体温度均匀性变差而减小,温度分布不均同时引起流速分布不均,温度分布不均引起的取热率下降幅度要明显大于相同平均质量流速、温度下床层入口气体流速不均引起的取热率下降幅度;对于立式氧化床,各部分气体由于温度不同导致的浮力大小不同以及气体所受浮力由于进风方式不同导致的对流动影响差异,换热器取热率也随之发生变化,随着床层入口气体平均温度逐步升高,进风方式对取热率影响越来越明显。
[Abstract]:On the basis of experimental verification of the mathematical model, the effect of gas inflow characteristics on the heat recovery of the inner heat exchanger of the spent air oxidation bed in coal mine is studied.The results show that the heat removal rate decreases with the decrease of the uniformity index of mass flow velocity at the inlet of the bed, and the existence of honeycomb ceramics leads to the unidirectional conduction of gas flow and increases the physical velocity and radiation area of the bed.When the uniformity index of inlet gas velocity is reduced by the same amplitude, the heat removal rate of the packed bed inner heat exchanger is larger than that of the empty bed heat exchanger, and when the average mass velocity of the inlet gas in the bed layer is constant,The heat removal rate of the inner calorizer decreases with the uniformity of the gas temperature at the inlet of the bed, and the uneven temperature distribution leads to the uneven distribution of the velocity of flow, and the decrease of the heat removal rate caused by the uneven distribution of the temperature is obviously larger than that of the same average mass velocity.The decrease of heat removal rate caused by the uneven flow rate of inlet gas at the bed temperature; for vertical oxidation bed,The heat removal rate of heat exchanger changes with the difference of buoyancy caused by different temperature and the effect of buoyancy on flow caused by different inlet air.With the increasing of the average temperature of the inlet gas in the bed, the influence of the air intake mode on the heat recovery rate becomes more and more obvious.
【作者单位】：山东理工大学材料科学与工程学院;
【基金】：山东省自然科学基金资助项目(ZR2015EL035) 国家“863”高技术基金重点资助项目(2009AA063202)
【分类号】：TD712

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