弯管中高浓度煤粉气力输送流动特性的模拟

代婧鑫1,丁学勇1,许海法2,刘程宏1,居天华1

钢铁研究学报 ›› 2020, Vol. 32 ›› Issue (5) : 377-385.

钢铁研究学报 ›› 2020, Vol. 32 ›› Issue (5) : 377-385. DOI: 10.13228/j.boyuan.issn1001-0963.20190170
冶炼与加工

弯管中高浓度煤粉气力输送流动特性的模拟

  • 代婧鑫,丁学勇,许海法,刘程宏,居天华
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Numerical simulation of conveying characteristics of dense phase pulverized coal in bend pipe

  • DAI Jing-xin,DING Xue-yong,XU Hai-fa,LIU Cheng-hong,JU Tian-hua
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摘要

摘要:为了探究弯管中高浓度煤粉气力输送的流动特性,采用Savage的颗粒动力学模型,引入校正后的阻力系数模型和径向分布函数,建立了高浓度煤粉气力输送的数学模型,并用该模型对垂直转水平90°弯管中的压降与流动分布规律进行数学模拟研究。结果表明:在垂直转水平弯管段的高浓度煤粉气力输送过程中,弯管处存在明显的二次流、涡流、塌陷和堆积等现象;弯管段的总压降会随着输送的煤粉颗粒粒径、输送固气比以及输送速度的增大而增大。这些研究结果对高浓度煤粉气力输送的输送条件及管路的设计具有重要意义。

Abstract

Abstract:In order to investigate the conveying characteristics of dense phase pulverized coal in bend pipe, a mathematical model of dense phase particle pneumatic conveying was established by using the kinetic theory of granular flows and introducing the improved frictional resistance coefficient of particles and radial distribution function. And then mathematical model was used to simulate the pressure drop and flow distribution of dense phase pulverized coal pneumatic conveying in 90° bend pipe with vertical rotating to level. The results show that the phenomena of second flow zone, vortex zone, subsidence zone, and particle packing are found in the place where the pipe is bending; and the total pressure drop of bend pipe increases with the increasing of particle size of the pulverized coal particles, the solidgas ratio, as well as the conveying speed, respectively. These findings are of great significance for the conveying conditions of dense phase pulverized coal pneumatic conveying as well for the design of pipelines.

关键词

关键词:高浓度 / 弯管 / 气力输送 / 数值模拟 / 涡流

Key words

Key words:dense phase / bend pipe / pneumatic conveying / numerical simulation / vortex zone

引用本文

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代婧鑫1,丁学勇1,许海法2,刘程宏1,居天华1. 弯管中高浓度煤粉气力输送流动特性的模拟[J]. 钢铁研究学报, 2020, 32(5): 377-385 https://doi.org/10.13228/j.boyuan.issn1001-0963.20190170
DAI Jing-xin1,DING Xue-yong1,XU Hai-fa2,LIU Cheng-hong1,JU Tian-hua1. Numerical simulation of conveying characteristics of dense phase pulverized coal in bend pipe[J]. Journal of Iron and Steel Research, 2020, 32(5): 377-385 https://doi.org/10.13228/j.boyuan.issn1001-0963.20190170

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