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Opinions on design improvement of 80*!kt/a sulphur burning sulphuric acid plants.

Wang Wei, Xiang Zhiquan(17)  
Trial production of four 80*!kt/a sulphur burning sulphuric acid plants built in 1995~1996 is summarized The process arrangement and engineering of the plants are successful on the whole with a SO 2 conversion of 99 5%~99 7%,output more than 270*!t/d H 2SO 4 and tailgas emission up to the national standard The main problems include serious corrosion of dilute acid during sulphur melting due to high acidness and water content of element sulphur, acid condensing corrosion in conversion system when process gas is blown in after warming up with diesel combustion gas because a large amount of water vapour exists therein, and serious leakage inside and outside waste heat recovery equipment owing to improper material of construction and structure Some suggests for improvement are presented
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