Retrofit of 350-MW Supercritical Boiler Based on the Analysis on Exhaust Gas Temperature

Since the first batch of 350-MW supercritical utility boilers was put into operation, the exhaust flue gas temperature of the boilers has always been higher than the designed value. The main reason is that the heat absorbed by the air heater is not sufficient. In Huaneng Dongfang Power Plant, the exhaust flue gas temperature is lowered through modifications to the economizer and the air heater. The experimental results reveal that every year, each boiler could save 3 850 tons of standard coal and reduce 85 tons of SO2 and 9 000 tons of CO2 respectively after retrofit.

空气气氛下煤质的CO析出特性实验研究

目前,中速磨煤机已被火力发电厂广泛使用,为了防止中速磨在其运行中着火爆炸,运行人员习惯把中速磨的出口温度控制在较低水平。虽然CO浓度变化不是磨煤机爆炸的直接原因,但中速磨内部CO的浓度与磨煤机的着火爆炸有着很强的相关性。采用热重和红外联用的方法,通过不同温升速率持续加热煤粉得到了CO的析出规律。首次提出了CO第一析出温度、第二析出温度概念,并通过恒温加热得到了CO第一析出温度以上或以下时的CO析出特性。CO析出特性的研究对于提高磨煤机运行的出口温度、降低排烟温度,提高锅炉效率有着重要意义。

船舶废气锅炉蒸发量的计算与分析

介绍了船舶废气锅炉蒸发量计算的原理及常用计算方法 ,分析了影响废气锅炉蒸发量的因素及各参数之间的关系,尤其是推导出废气锅炉排气出口温度与废气锅炉换热面积及对数平均温差的关系式,为船舶蒸汽废气锅炉的选型计算提供有力的理论依据。通过对2 500 TEU项目废气锅炉蒸发量的计算与分析,得出了最优化的废气锅炉蒸发量设计方案,在保证锅炉布置及建造成本合理性的同时,使废气锅炉蒸发量最大化。