Research on the application of flexible contact sealing technology in air leakage control of boiler air preheaters
CHEN Boming
WAN Mao
JIANG Qinghu
HE Jinwei
Abstract：Aiming at the problems of severe air leakage and frequent blockage of the air preheater in the 600 MW supercritical coal-fired unit boiler,the application effect of flexible contact sealing technology is studied.It adopts components such as self-lubricating alloy sliders,Inconel X-750 special springs and double-layer nested rotating shafts to achieve gapless dynamic sealing.The results show that after the transformation,the air leakage rate has dropped below 5.2%,with a reduction of 47.3%～49.5%.The annual electricity consumption of wind turbines is saved by 1 431 kW and 20 800 t of standard coal.The comprehensive economic benefit reached 26.147 million yuan,and the static investment payback period was only 5.3 months.Long-term tracking shows that the system operates stably with an annual wear of 0.3 mm to 0.4 mm,verifying the obvious advantages of this technology in energy-saving and consumption reduction,reliability.
Keywords：flexible contact sealingair preheaterair leakage controlwear-resistant materialboiler efficiencyenergy-saving
Publication Date：2025-11-30
Online Publishing Date：2025-12-29(First online date of this platform, not the publication date of the document)
Pages：5( 34-38 )