摘要
脱硫系统是火电厂的能耗大户,本文针对石灰石/石膏湿法脱硫系统中,石膏旋流器内空气柱导致的耗能问题进行研究。采用Fluent软件对石膏旋流器内部流场进行了数值模拟,结果表明:空气柱内的气体具有一定的轴向速度与切向速度,空气做螺旋流动,该流动引起旋流器内能量的损耗;采用中心棒能部分或全部消除空气柱。通过实验对无中心棒以及采用中心棒后,旋流器的生产能力、底流含固量等指标参数以及单台旋流器的能耗进行了测量,实验数据表明:采用中心棒后,石膏旋流器的生产能力与底流含固量明显增大;根据4×600 MW机组的实际石膏产量,对不同结构石膏旋流器分析计算得出:生产相同石膏量的前提下,采用倒锥形中心棒可使能耗降低13.41%,并且能有效缓解底流夹细现象。
In power plant,the energy consumption of wet flue gas desulfurization( WFGD) system accounts for 1%- 2% of plant electric consumption. The gypsum cyclone is an important equipment in dewatering system of WFGD. Air core is a special phenomenon in solid-liquid cyclone. The flow field in gypsum cyclone was simulated with Fluent.The results indicate that: two air backflows form a whole air core and the movement of air wastes energy provided by gypsum pump. And the air core will disappear partly or wholly by inserting a solid central rod in cyclone. The corresponding experiments were carried out,and results illustrated that both production capacity of gypsum cyclone and solid content in under flow increase apparently with a central solid rod. The energy consumption of gypsum cyclone in a power plant with the capacity of 4 × 600 MW was calculated and compared,and it was concluded that with the conical central solid rod the energy consumption of the gypsum pump is reduced about 13. 41% and the ' fishhook' phenomenon is improved effectively.
出处
《热能动力工程》
CAS
CSCD
北大核心
2016年第12期56-61,共6页
Journal of Engineering for Thermal Energy and Power
关键词
节能降耗
空气柱
中心棒
石膏旋流器
energy saving
air core
central solid rod
gypsum cyclone
