循环流化床锅炉内颗粒流传热研究

流化床内的传热现象已经有相当广泛的研究。但由于循环流化床锅炉影响因素多、测量复杂,绝大部分循环流化床传热研究都是在实验设备内进行的,由于循环流化床设备的放大问题一直没有很好解决,实验室中的数据要推广到工业应用上还需要进一步研究。大型工业循环流化床锅炉在国内发展迅速,锅炉内的传热问题急需解决,因为关系节能降耗。在一台国产大型循环流化床锅炉上测量实际运行数据,研究炉膛换热现象。测量数据显示:循环流化床炉内传热系数与锅炉机组负荷、烟速、稀相区压降有密切关系。

Heat Transfer Investigation through Operating Parameter Collection from a 135MW Circulating Fluidized Bed Boiler

Heat transfer phenomenon in Circulating Fluidized Bed (CFB) boilers has been researched world wide due to its importance to boiler design and operation, but reports on heat transfer of large-scale CFB boilers was very limited, because of complexity of operation data and commercial reasons. Influence factors of heat transfer in a 135MW CFB is discussed based on the operation data, and the results show that heat transfer coefficient was affected by boiler load, gas velocity and pressure drop in dilute zone.