Preliminary investigation on the effects of primary airflow to coal particle distribution in coal-fired boilers

[摘要] This paper presents an investigation on the effects of primary airflow to coal fineness in coal-fired boilers. In coal fired power plant, coal is pulverized in a pulverizer, and it is then transferred to boiler for combustion. Coal need to be ground to its desired size to obtain maximum combustion efficiency. Coarse coal particle size may lead to many performance problems such as formation of clinker. In this study, the effects of primary airflow to coal particles size and coal flow distribution were investigated by using isokinetic coal sampling and computational fluid dynamic (CFD) modelling. Four different primary airflows were tested and the effects to resulting coal fineness were recorded. Results show that the optimum coal fineness distribution is obtained at design primary airflow. Any reduction or increase of air flow rate results in undesirable coal fineness distribution.

[发布机构] TNB Research Sdn. Bhd., Lorong Ayer Hitam, Selangor, Kajang; 43000, Malaysia^1;Department of Mechanical Engineering, Universiti Tenaga Nasional (UNITEN), Selangor, Kajang; 43000, Malaysia^2

[效力级别] 力学 [学科分类] 力学，机械学

[关键词] Air flow-rate;CFD simulations;Coal particle size;Coal particles;Coal-fired power plant;Combustion efficiencies;Performance problems;primary airflow