建议硫酸生产采用3＋2两转两吸流程

Recommending 3 + 2 Double Conversion Technology to Sulphuric Acid Plants

在进气ＳＯ２浓度为９％的条件下，由于３＋１两转两吸工艺不能确保总转化率＞９９％、尾气ＳＯ２浓＜５００ＰＰｍ，故推荐３＋２两转两吸工艺。设计计算表明，采用３＋２两转两吸工艺，转化器投资基本相当，虽增加一台换热器，总传热面积却有所下降。实际运行数据表明，当进气ＳＯ。浓度为８．４％～８．６％时，总转化率为９９．７９％～９９．８８％，尾气ＳＯ滤浓度＜３００ｐｐｍ；当进气ＳＯ２浓度为９．０％～９．２％时，总转化率仍达９９．６８％～９９．７２％，尾气ＳＯ２浓度＜５００ＰＰｍ。

The 3 + 2 double conversion technology is recommended to the H2SO4 plants in 3 + 1 double conversion configuration where the total conversion can not be maintained at >99 % or SO2 concentration in the tail gas is >500ppm when a inlet SO2 concentration of about 9% is adopted. The design calculation indicate that the capital costs of converter in both configuration are about the same but the total heat exchange area in 3+2 is a little lower than in 3 + 1 although a additional heat exchanger is needed.The practical operation data showed that the totalconversion was 99. 79%～ 99. 88% and the SO2 in tail gas < 300ppm when the inlet SO2 concentration was 8. 4% ～8. 6%, and 99. 68%～ 99. 72% and <500ppm when the SO2 was 9. 0% ～ 9. 2%, respectively.