深度调峰下的再热汽温偏差调整试验研究  

Experimental Study on Deviation Adjustment of Reheat Steam Temperatures Under Deep Peak Shaving Conditions

作　　者：周文台 王克 吕为智 ZHOU Wentai;WANG Ke;Lü Weizhi(Shanghai Power Equipment Research Institute Co., Ltd., Shanghai 200240, China)

机构地区：[1]上海发电设备成套设计研究院有限责任公司

出　　处：《动力工程学报》2019年第9期700-704,730,共6页Journal of Chinese Society of Power Engineering

基　　金：国家电力投资集团有限公司科技资助项目(201805560)

摘　　要：为了消除低负荷时的再热汽温偏差,达到两侧再热汽温相对一致的目的,通过试验测试炉膛燃烧器喷口温度及煤粉质量分数,分析了产生再热汽温偏差的原因。结果表明:低负荷时产生再热汽温偏差的原因是磨煤机出口煤粉分配不均,造成各燃烧器着火不一致,进而影响左右侧的火焰中心位置;低负荷时难以通过强化着火来缩小各燃烧器着火距离偏差,但可以通过弱化部分燃烧器的着火来实现着火一致性,从而缓解热偏差,但低负荷时弱化着火的调整方法会牺牲着火稳定性,需要因炉而异实施;解决着火不一致的根本方法是在磨煤机出口安装煤粉分配器。To eliminate the deviation of reheat steam temperature on both sides of a boiler during low load operation, the causes leading to the temperature deviation were analyzed by measuring the burner nozzle temperature and pulverized coal density. Results show that the deviation of reheat steam temperature at low load is mainly caused by the uneven distribution of coal powder at mill exit, which produces unbalanced combustion among the burners, and further affects the flame center height around the left and right side walls. At low loads, it is difficult to reduce the difference of ignition distance for all the burners by strengthening the ignition, but it is possible to achieve the consistency by weakening the ignition of partial burners. However, the latter way may result in lowered combustion stability, which needs to be evaluated according to specific furnace conditions in actual application. The fundamental method to solve the problem is to install a coal powder distributor at exit of the coal mill.

关 键 词：燃烧调整 热偏差 火焰中心 煤粉分配器 

分 类 号：TK227[动力工程及工程热物理—动力机械及工程]