热力发电2017，Vol.46Issue(6)：141-144,4.DOI:10.3969/j.issn.1002-3364.2017.06.141
300 MW机组锅炉煤粉混合器结构优化改造
Structure optimization for pulverized coal mixer of a 300 MW unit boiler
摘要
Abstract
The pulverized coal mixer is one of the important equipments in the middle storage type boiler. Its normal operation is the key to ensure the stable combustion of the pulverized coal boiler. Combing with the positive pressure off powder occurred in pulverized coal mixer of a 300 MW unit boiler under full load conditions, this paper carried out numerical simulation to analyse the flow field and particle trajectories by using the Fluent software. The large on-way resistance and local resistance of the primary air pipe behind the coal mixer and the defects in structural design of the pulverized coal mixer are considered as the major reasons for off powder. To solve this problem, it suggests that the coal mixer tray should be moved vertically down by 60 mm, and the inner side of the powder inlet be longitudinally extended by 30 mm. Moreover, numerical simulation and experiments were performed to verify the optimized structure. The results show that, after structure optimization, under full load condition, the pulverized coal output of coal mixer for a single primary air pipe increased by 3 t/h, and the coal flow at the outlet was uniform and smooth, no off powder was observed.关键词
锅炉/煤粉混合器/一次风管/脱粉/结构优化/Fluent软件Key words
boiler/pulverized coal mixer/primary air pipe/poor powder/structure optimization/Fluent software分类
能源科技引用本文复制引用
朱朝阳,周飞,穆维府,姬海民,周平,鲁芬,赵治平..300 MW机组锅炉煤粉混合器结构优化改造[J].热力发电,2017,46(6):141-144,4.基金项目
国家自然科学基金项目(51406166) National Natural Science Foundation of China (51406166) （51406166）
