原煤仓疏通棚煤智能控制系统的开发与应用

Development and application of intelligent control system for eliminating shed-shaped coal caking in raw coal bunker

针对华电能源牡丹江第二发电厂近年来原煤斗棚煤现象不断加剧的现状,提出了解决北方寒冷地区冬季原煤斗棚煤问题的措施:对料位传感器重新设计、布局,准确监控仓内料位,实现高料位的自动报警;设计液控系统和松煤器,使其在动态下有效消除夏季煤仓内的棚煤,遏制冬季时煤在仓壁的冻结沉积;利用高温高压蒸汽切削冻煤,解决煤在仓内的冻结成砣问题;设计可编程控制器自动控制系统,使系统自动发现问题、解决问题,保证锅炉安全、经济运行。

The phenomenon of shed-shaped coal caking in raw coal bunker of Huadian Energy Mudanjiang Second Power Plant aggravates gradually for past few years.Aiming at this problem,the measures to solve the shed-shaped coal caking in raw coal bunker in north cold area at winter were put forward.The material level sensors were redesigned and arranged to make them can monitor the material level in the coal bunker more accurately and to realize automatic alarm of high material level.The hydraulic control system and the coal loosening device were designed to make them can eliminate the shed-shaped coal caking in the coal bunker dynamically at summer and suppress the frozen coal on the raw coal bunker wall at winter.The high-temperature and high-pressure steam was used to cut the frozen coal,which can avoid the frozen coal to form large agglomerate.The PLC automatic control system was designed,by which the system can find and solve the problems itself automatically.So the safe and economic operation of the boiler was ensured.