高水分褐煤流动性离散元数值模拟  

Discrete Element Numerical Simulation of Fluidity of High Moisture Lignite

作　　者：刘佳 孙佰仲[2] 高梓维 LIU Jia;SUN Baizhong;GAO Ziwei(Operation Department of Guoneng Baoqing Coal and Electric Chemical Co.,LTD.,Shuangyashan155600,Heilongjiang Province,China;School of Energy and Power Engineering,Northeast Electric Power University,Jilin 132000,Jilin Province,China)

机构地区：[1]国能宝清煤电化有限公司运行部,黑龙江省双鸭山市155600 [2]东北电力大学能源与动力工程学院,吉林省吉林市132000

出　　处：《发电技术》2024年第5期969-974,共6页Power Generation Technology

基　　金：吉林省自然科学基金项目(20210101072JC)。

摘　　要：【目的】由于火电厂实际运行下使用的均为高水分褐煤,输送煤的过程中经常会发生堵塞以及黏附等问题。因此,利用EDEM软件对该问题进行数值模拟分析。【方法】通过对现场煤样考察分析,模拟过程中主要对煤的粒径、水分以及流动总量进行分析,并探究其对煤的流动性的影响。数值模拟分析后,将流动速度以及颗粒之间作用力进行对比,得到各项因素对煤流动的影响。【结果】造成堵塞的主要原因如下:首先,煤的粒径过大或过小导致在仓体流动过程中其自身颗粒与颗粒之间发生相对作用;其次,煤在仓体流动过程中,随着煤量增加,其流动状态由整体流动转变为中心流动;最后,煤的含水率是最主要的因素,其不仅影响自身黏附性,还会引起自重的增加,所以水分过大会引起流动缓慢,进而发生堵塞。【结论】研究结果可为解决燃煤电厂堵煤问题提供理论支持。[Objectives]Due to the fact that the actual operation of the thermal power plant uses high moisture lignite,problems such as blockage and adhesion often occur during coal transportation.Therefore,this article uses EDEM software for numerical simulation analysis based on these problems.[Methods]Through the investigation and analysis of on-site coal samples,in the simulation process,the particle size,moisture content,and total flow of coal were mainly analyzed,and its impact on the fluidity of coal was exploved.After numerical simulation analysis,the effects of various factors were compared using flow velocity and forces between particles.[Results]The main reasons for blockage are as follons:firstly,the relative interaction between coal particles during the flow process in the silo is caused by the coal particle size being too large or too small;Secondly,as the amount of coal increases,the flow state of coal in the warehouse changes from overall flow to central flow;The last and most important factor is the moisture content of coal,which not only affects its own adhesion but also increases its own weight.Therefore,excessive moisture can cause slow flow and blockage.[Conclusions]The research results can provide theoretical support for solving the problem of coal blockage in coal-fired power plants.

关 键 词：火电厂 EDEM仿真 煤流动性 堵煤 水分 粒径 

分 类 号：TK01[动力工程及工程热物理]