Analysis and Treatment of High Differential Pressure of Boiler Air Preheater for 630 MW Unit

Abstract

The 630 MW coal-fired unit of a power plant in Zhejiang underwent comprehensive efficiency improvement. And the differential pressure of air preheater gradually increased, leading to the negative pressure increasing to the maximum at the inlet of two induced draft fans. Through the analysis of the causes and the adjustment of air preheater’s operation, a more reasonable and comprehensive operation processing scheme was put forward. It effectively controlled the differential pressure increase and optimized the economy and safety of the unit operation.