Abstract
This paper presents a comprehensive approach for optimization of soot-blowing of air preheaters in a coal-fired power plant boiler. In the method, modeling of the cleanliness factor is firstly proposed to monitor the ash deposition status of the air preheaters. Then, the statistical fitting of the ash fouling status is subsequently obtained to analyze the ash fouling dynamics and assessment of optimized soot-blowing strategies. Soot-blowing strategies are finally developed to optimize the steam consumption and heat transfer efficiency. Our methods can achieve the fouling monitoring and soot-blowing optimization of air preheater (APH) by using the existing monitoring data, not requiring additional special instruments and complex computing systems. The methodology is validated with the actual operating data of a 300 MW coal-fired power plant boiler. The results show the effectiveness of the proposed method. It can be used for the soot-blowing optimization in most coal-fired power plant boiler with air preheaters.
Highlights
During the past decades, concern about energy conservation and environmental protection is growing all over the world
Air Preheater (APH) of a coal-fired power plant boiler is an important piece of engineering equipment, which is designed to heat air with the primary objective of increasing boiler thermal efficiency
This paper focuses on the ash fouling monitoring and soot-blowing optimization of air preheater (APH)
Summary
Concern about energy conservation and environmental protection is growing all over the world. Deposition of ash on heat transfer equipment has always been one of main operation concerns in coal-fired power plant boiler [5]. Online monitoring of ash deposition status in different sections of boiler is the basis of soot-blowing optimization. It can be accomplished by using particular power plant instrumentation and online computations or a combination of both approaches. Air Preheater (APH) of a coal-fired power plant boiler is an important piece of engineering equipment, which is designed to heat air with the primary objective of increasing boiler thermal efficiency. A comprehensive approach is proposed for optimization of soot-blowing of APH in a coal-fired power plant boiler, aiming at increasing the boiler efficiency and decreasing the steam consumption.
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