Causes and Impacts of High Differential Pressure in Air Preheaters of Thermal Power Plants

Abstract

The air preheater (APH) in thermal power plants, as an essential component of the boiler system, directly affects the safety and
economy of boiler operation. In recent years, the issue of high differential pressure in air preheaters has become increasingly prominent and
has emerged as one of the bottlenecks restricting the efficient operation of boilers. Based on relevant data and field research, this paper conducts an in-depth analysis of the causes and impacts of high differential pressure in air preheaters from two aspects: mechanical damage to the
elastic sealing device and ash accumulation blockage. The research findings indicate that mechanical damage to the elastic sealing device and
ash accumulation blockage are the main reasons for the increased differential pressure in air preheaters. The increase in differential pressure
not only affects the safe and stable operation of the boiler but also increases operating costs and maintenance difficulties.