为研究耐磨耐火材料导热系数对循环流化床(circulating fluidized bed，CFB)传热特性的影响，以某300 MW CFB锅炉所给定的结构尺寸和各受热面面积、锅炉容量和主要运行参数为研究对象，采用热力计算方法对炉膛下部锥段采用导热系数分别为λ=1.5、5、10、15、20W/(m·℃)的耐磨耐火材料时，床温特性、过热蒸汽温度特性、炉内各受热面吸热量的变化规律进行了分析。结果表明，随着炉膛下部锥段所采用耐磨耐火材料的导热系数增加，锅炉床温呈下降趋势；蒸发器吸热比例增加；过热器和再热器吸热量均减小；蒸发器吸热量和炉内总吸热量总体呈上升趋势，但当导热系数增加到一定程度，即大于20W/(m·℃)时，炉内蒸发器和炉内总吸热量反而降低；耐磨耐火材料导热系数为λ=1.5、5、10、15W/(m·℃)时，主汽温度经过减温水减温可保持设计温度540℃不变，而且随着耐磨耐火材料导热系数的增加，过热器减温水量减少，但当导热系数增加至20W/(m·℃)时，主汽温度降低，尽管此时过热器系统不进行喷水，依然无法满足主汽温度的设计要求，故炉膛密相区耐磨耐火材料导热系数推荐不超过20W/(m·℃)。

In order to study the effect of wear-resistant refractory materials thermal conductivity on the heat transfer characteristics of a circulating fluidized bed (CFB), a 300 MW CFB boiler was taken as the research object with its given structural dimensions, heating surface areas, boiler capacity, and major operating parameters. Using thermal calculation methods, the changes in bed temperature characteristics, superheated steam temperature characteristics, and heat absorption of various heating surfaces within the furnace were analyzed when the thermal conductivity of the wear-resistant refractory materials used in the lower conical section of the furnace was set to λ=1.5, 5, 10, 15, and 20W/(m ℃), respectively. The results indicated that as the thermal conductivity of the wear-resistant refractory materials in the lower conical section of the furnace increases, the boiler bed temperature tends to decrease; the proportion of heat absorbed by the evaporator increases; the heat absorption of both the superheater and reheater decreases; the heat absorption of the evaporator and the total heat absorption within the furnace show an upward trend. However, when the thermal conductivity increases to a certain extent, i.e., greater than 20W/(m ℃), the heat absorption of the evaporator and the total heat absorption within the furnace actually decrease. When the thermal conductivity of the wear-resistant refractory materials is λ=1.5, 5, 10, and 15W/(m ℃), the main steam temperature can be maintained at the design temperature of 540℃ with the help of desuperheating water. Moreover, as the thermal conductivity of the wear-resistant refractory materials increases, the amount of desuperheating water for the superheater decreases. But when the thermal conductivity reaches 20W/(m ℃), the main steam temperature drops, and even without spraying water in the superheater system, it cannot meet the design requirements for the main steam temperature. Therefore, it is recommended that the thermal conductivity of the wear-resistant refractory materials in the dense phase zone of the furnace should not exceed 20W/(m ℃).

国家重点研发计划项目课题“循环流化床宽负荷下硫氮污染物高效协同控制方法与策略研究”（2022YFB4100301）;中央高校基本科研业务费专项资金（2022ZFJH004）;“北京市科协卓越工程师成长计划”