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Design features of conversion equipment in medium-scale sulphuric acid plants based on pyrites

Ye Shuzi (Guangzhou Hongda Technical Development Co.,Ltd.,Guangzhou,Guangdong,510140,China)  
Design features of conversion equipment in some domestic medium-scale sulphuric acid plants based on pyrites are discussed.The catalyst beds are arranged in the order of pass two,third,four,five and one from up to down.The shell is divided into sections according to respective beds and each section is welded to a partition board which has a diameter 15mm larger than the outside diameter of shell to ensure gas tightness.For enhancing heat transfer and flexibility to operating load,heat exchangers with contracted-expanded tubes supported by perforated plates are used.Hot tube economizers are installed to ensure temperature of gases entering absorption towers and raise heat recovery of system.It is recommend to use electric furnace for plant startup.
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