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文章通过对DZL7.0-1.0/115/70-Ⅱ型热水锅炉采用等径、不等径水冷壁管的水动力分析，说明了为避免二次垢爆管，适当增加高温区水冷壁管直径，锅炉水循环仍然是安全的，不会产生过冷沸腾引起的一次垢爆管。
Through the hydrodynamic analysis of DZL7.0-1.0 / 115/70-Ⅱ hot water boiler using equal-diameter and unequal-diameter water-cooled wall tubes, it is shown that in order to avoid secondary scale explosion, Diameter, the boiler water cycle is still safe, will not produce a cold pipe burst caused by sub-cooling pipe.