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除尘器进气口气流分布数值模拟及设计

发布时间:2018-01-06 08:24

  本文关键词:除尘器进气口气流分布数值模拟及设计 出处:《河北科技大学》2017年硕士论文 论文类型:学位论文


  更多相关文章: 电除尘器 除尘效率 数值模拟 气流分布板 流动状态


【摘要】:随着钢铁产量的高速发展,大气环境的恶化加剧,人们的生存和居住环境正面临着挑战。钢铁行业生产钢铁的过程中将产生大量的烟气粉尘等副产品,对大气环境造成严重的污染。钢铁企业应在发展冶炼钢铁的主业时,下大力对钢铁生产中产生的副产品进行回收利用,增加企业的非钢效益。无论烟气是排放还是回收利用,烟气的除尘净化都是重中之重。环保对烟气排放有严格的要求,冶金行业的烟气进行粗除尘后再进一步精除尘才能够排放。电除尘器是现代工业甚至是钢铁行业用于精除尘的主要设备,它除尘效率高,除尘量较传统除尘器也比较显著,企业需求也就越来越大。在烟气粉尘含量较低的情况下,湿式电除尘器效果也比较好。但是国内企业都是模仿国外除尘器结构思路对产品进行改造,不断探索以加强除尘器的除尘效率,除尘器内理想的气流分布状态是均匀流动的层流。烟气流动的分布状态是除尘器提高除尘效率的重要参数,故本论文将如何得到理想的气流分布作为研究内容,通过在除尘器内架设布置气流分布板来改变除尘器内部的流场流动。采用计算机数值模拟软件建立三维几何数值模型,加载多相流和多介质物理模型对问题进行求解,得出除尘器进气入口和内部流场。通过改变导流板在除尘器进气口的位置和开口率,模拟出不同的流动状态,截取不同点的气流速度数值,根据一定的评估方法得出最优的设置参数,并对试验结果进行分析和验证。
[Abstract]:With the rapid development of iron and steel production and the deterioration of atmospheric environment, people's survival and living environment are facing challenges. A large number of flue gas dust and other by-products will be produced in the process of iron and steel production in iron and steel industry. The iron and steel enterprises should make great efforts to recycle the by-products of iron and steel production when developing the main industry of smelting iron and steel. Increase the non-steel benefits of enterprises. No matter whether the flue gas is discharged or recycled, the dust removal and purification of flue gas is the most important. Environmental protection has strict requirements for flue gas emissions. The flue gas of metallurgical industry can only be discharged after coarse dedusting and then fine dust.Electrostatic precipitator (ESP) is the main equipment used for fine dust removal in modern industry and even in iron and steel industry, and its dust removal efficiency is high. Compared with the traditional dust collector, the amount of dust removal is more and more significant, and the demand of the enterprise is also increasing. In the case of low dust content of flue gas. The effect of wet electrostatic precipitator is also good, but domestic enterprises are imitating the structure of foreign dust collector to reform the product, and constantly explore to enhance the dust removal efficiency of the dust collector. The ideal airflow distribution state in the dust collector is laminar flow and the flue gas flow distribution state is an important parameter to improve the dust removal efficiency, so how to get the ideal flow distribution is considered as the research content in this paper. In order to change the flow field of the dust collector, the three-dimensional geometric numerical model is established by installing the airflow distribution plate in the dust collector. The problem is solved by loading multi-phase flow and multi-medium physical model, and the inlet and internal flow field of the dust collector are obtained. Different flow states are simulated by changing the position and opening rate of the guide plate in the inlet of the dust collector. The airflow velocity values of different points are intercepted and the optimal setting parameters are obtained according to certain evaluation methods and the experimental results are analyzed and verified.
【学位授予单位】:河北科技大学
【学位级别】:硕士
【学位授予年份】:2017
【分类号】:X787

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