引风机和一次风机自动旁路高压变频改造热控方案

Thermal control scheme of high voltage variable frequency reformation with automatic bypass for induced draft fan and primary air fan

介绍了带自动旁路功能高压变频器在云南华电巡检司发电有限公司循环流化床锅炉一次风机和引风机的变频改造方案,重点论述了分散控制系统控制逻辑和画面的修改及自动控制功能的优化。一次风机和引风机变频器改造后,热控逻辑完善、自动控制功能投入正常,实现了风机变切工、工切变运行状态自动切换功能,变频器故障时无扰自动切换至工频运行,不影响机组负荷,节能效果明显。

The variable frequency reformation scheme for primary air fan and induced draft fan of CFB boiler in Yunnan Huadian Xunjiansi Power Generation Corporation Limited using high-voltage frequency converter with automatic bypass function was introduced.The modification of the control logic and the picture of DCS and the automatic control function optimization were expounded emphatically.After the variable frequency reformation of the primary air fan and the induced draft fan,the thermal control logic is perfect,the automatic control function can put into operation normally,the fan operation state can be switched over from variable frequency to power frequency or otherwise automatically.When the frequency converter is failure,the fan operation state will be switched over automatically to power frequency without turbulence and the unit load will not be impacted.The energy saving effect of the reformation is obvious.