清洗中所排出的污热水进入回水箱后，可对预热管内的冷水进行预热，能充分地利用余热。
In the process of cleaning, after the discharged dirty hot water enters into a backwater tank, the hot water can preheat the cold water in a preheating tube and the residual heat is fully utilized.
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%.
该方法为热管空气预热器的合理设计和安全经济运行提供了参考。
It provides reference for the reasonable design, the safety and economical operation of heat-pipe air preheater.
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