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本文介绍了硫酸厂Ⅲ热交换器改造内容,缩放管的腐蚀情况及20 g钢缩放管加接不锈钢管的施工工艺.“,”This paper introduces renovation of heat exchanger number 3 in the sulfuric acid plant,including corrosion situation of zoom pipes,and construction technology of 20 g pipe connected with stainless steel pipe.