金属或物料加热时吸收的热量与供入炉内的热量之比,称为炉子热效率。
加氢反应炉空气预热系统改用热管预热器后，炉子热效率提高了约3%。
After the air preheater system of hydrogenated reaction furnace changes into heat tube preheater, the heat efficiency of furnace increases about 3%.
采用这些技术后，提高了炉子的自动化程度、炉子热效率和热处理水平。
After making use of these new tech-nics, the automation level, thermal efficiency and heat treatment level of furnace are raised.
其设计指导思想是，最大程度地回收炉子的烟气余热，提高炉子热效率。
Its design concept is to recuperate flue gas and increase heat efficiency of furnace at a maximum extent.
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