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一、简述 接触法生产硫酸工艺中,干燥塔和吸收塔内的硫酸浓度为93—98％,温度约80～90℃,转入下道工序前,务须先使酸温降至60℃左右。为此,传统的方法是在铸铁排管外喷洒冷却水。该法不仅传热系数低,占地面积大,水和电的耗量多,环境污染严重,而且白白浪费了大量的可资利用的热能。 六十年代末英国APV公司采用Hastelloy-G合金的薄板制成了换热器,从而达到既冷却硫酸又回收热量的双重目的。所用材料
First, a brief description of contact production sulfuric acid process, the drying tower and absorption tower of sulfuric acid concentration of 93-98%, temperature of about 80 ~ 90 ℃, into the next process, the service must first make the acid temperature dropped to about 60 ℃ . To this end, the traditional method is to cast cooling water outside the cast iron pipe. The law not only low heat transfer coefficient, covers an area of large, water and electricity consumption, serious environmental pollution, and wasted a lot of available thermal energy. In the late sixties APV Company of the United Kingdom made of Hastelloy-G alloy sheet heat exchanger, so as to achieve the dual purpose of both cooling sulfuric acid and heat recovery. Materials used