300MW燃煤机组混燃秸秆成型燃料的试验研究

Experimental Research on Co-firing of Molding-straw in 300 MW Coal-firing Utility Furnace

该文利用已有制粉系统对成型生物质进行磨制并送入炉内燃烧,在300MW煤粉炉内实现了生物质的规模化利用。试验对生物质可磨性及磨煤机安全性进行分析;研究生物质混燃对火焰、温度、锅炉效率及污染物排放的影响。研究表明:辊式磨煤机和直吹式制粉系统,可用于成型生物质的磨制输送;生物质燃烧器喷口火焰稳定;生物质混燃工况下的炉膛上部温度分布和排烟温度,均比纯烧煤粉时更低;煤粉炉在混燃生物质的工况下运行时,锅炉效率略有下降;生物质混燃相对于纯烧煤粉,NOx和SO2均有所降低。该文研究对生物质在我国现有大容量煤粉炉上的直接混燃具有指导意义。

Molding-biomass has been utilized in a 300 MW pulverized coal furnace, and biomass was ground using the existing mill system, without any apparatus addition. The possibility of biomass grinding and the security of mill operating was analyzed, and the effects of biomass-cofiring on combustion flame, furnace temperature profile, furnace efficiency and pollution emission were also investigated. Results show that, roller mills and direct blowing puverizing system can be used to grind molding-biomass and to transport biomass particles. During the processes of biomass co-firing, the flame of biomass injector is stable. Both outlet temperaure of furnace and air preheater decreases after the biomass injection. When the pulverized coal furnace is operated under the biomass co-firing condition, the furnace efficiency is lowered. NOx and SO2 emission also decreases with the biomass quantity increasing. The results would provide a guidance for biomass co-firing on the exsiting pulverized coal furnace in China.