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燃煤循环流化床模型与试验研究-【新闻】灵武

发布时间:2021-04-20 12:10:20 阅读: 来源:乳化剂厂家

燃煤循环流化床模型与试验研究

中图分类号:TK26 TK229.6+6 文献标识码:A

文章编号:2222-226223-2249-24Experimental Study and Simulation of a Coal-fired Circulating Fluidized BedShen Laihong

Based on the basic research results concerning the gas-solid dual-phase flow of a circulating fluidized-bed and an in-bed gas-solid bias flow model the author has set up a circulating fluidized-bed combustion model suited for different construction parameters. The model has taken into account the return mixing and the circulation process of gas and solid particles in the bed. Also considered are such a variety of factors as coal burning, the generation and dissolution of nitrogen oxides and particle wear action, etc. The results of the experimental study and model simulation on a circulating fluidized-bed combustion test rig are in good agreement with the experimental data. This fully demonstrates that the circulating fluidized-bed combustion system set up on the basis of the gas-solid dense-lean flow model can accurately simulate the combustion process of a circulating fluidized bed.

Key words: coal, circulating fluidized bed combustion, mathematical model, experimental study2 引言目前国内外进行循环流化床锅炉总体模型研究工作的科研机构较多,最具典型的有国际能源署IEA-FBC模型,它以流化床燃烧室为对象,建立起带有飞灰回送的流化床燃烧系统模型,将燃烧室分为鼓泡床和悬浮段,沿床高方向又将鼓泡床和悬浮段划分为若干小室,鼓泡床又分为气泡相和乳化相,分别列出三个区域的质量守恒方程,能量守恒方程。德国济根大学组织开发的循环流化床模型[2~2],沿垂直方向将炉膛、分离器和副床划分为若干小室,模型方程由小室内气体、固体质量守恒方程,能量守恒方程组成。这些模型均忽略了小室内气体返混,将小室内气体固体颗粒处理成均匀混合的悬浮状态,这和循环床炉膛内气固两相流动真实情形有较大的偏差。

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