干、湿式除渣系统对锅炉效率影响的研究

风冷干式除渣系统对锅炉效率的影响目前尚存争议,缺少权威定论。通过为期3年的对干式除渣系统的研究,建立了锅炉效率、炉渣冷却风量等参数的数学模型,结合对某电厂1 000 MW锅炉干式除渣系统的运行测试,得出干式除渣系统在多数情况下影响锅炉燃烧、降低锅炉效率;干式除渣系统比湿式除渣系统对锅炉燃烧及效率的影响更大;易结焦煤不宜采用干式除渣系统;当电厂燃煤煤质变化较大时,应慎重采用干式除渣系统等结论。

Study on the Impact of Dry and Wet Bottom Ash Handling Systems on Boiler Efficiency

So far the impacts of air-cooling dry-type bottom ash handling system on boiler efficiency are still controversial and very few authoritative conclusions have been drawn. After three years’ research on the system, the mathematical models including boiler efficiency and cooling air volume are established. Combining with the tests conducted in two 1 000-MW boilers of one power plant, it is concluded that the dry-type bottom ash handling system does have impacts on boiler combustion and lower the boiler efficiency under most circumstances. In addition, the impacts of the dry-type bottom ash handling system are greater than those of the wet-type system. The easy-cooking coal is not a suitable choice for the boilers with dry-type system. If the coal quality of the power plant fluctuates drastically, it is critical to choose the dry-type system meticulously.