关键词: W型火焰锅炉, 配煤掺烧, 燃煤适应性, 结焦

Abstract:

Taking W-flame boiler in Yangcheng Power Plant as an example, the combustion tests were carried out with using different coals and different blending ratio of anthracite and bituminous coals. A series of indices were analyzed, which covered the stability of boiler combustion, the characteristics of boiler coking, the safety of coal pulverizing system, the combustible content in boiler fly ash, the unit consumption of coal pulverizing system, and the air pollutant emission situation of boiler. The results show that the blended coal combustion in W-flame boiler can enhance the stability and economy of boiler combustion, reduce the NOX emission of boiler. Through blending lean coal with relatively low volatile or controlling the ratio of bituminous coal below 30%, the safety operation of boiler without anti-coking transformation can be guaranteed. Aimed at the coking problem of boiler, the coking position and reasons were analyzed to propose technical measures of anti-coking, whose effect has been verified by the practical application.

Key words: W-flame boiler, blended coal combustion, coal adaptability, coking