Technique for preparing sulfuric acid from SO2 by non-equilibrium state high-concentration twice conversion
A kind of high-concentration, sulfuric acid production technology
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[0011] Attached below figure 1 The present invention is described in detail with embodiment;
[0012] from SO 2 Blower 1, SO 2 18% cold SO 2 The flue gas first enters the IV heat exchanger 3 and exchanges heat with the hot flue gas at the outlet of the fourth section of the converter 2. The flue gas undergoes heat exchange. After two heat exchanges, the flue gas temperature reaches the light-off temperature of the catalyst and enters the first stage of the converter for conversion reaction. Since the loading amount of the catalyst is less than normal, the conversion rate of the reaction is lower than the equilibrium conversion. At this time, the conversion rate is preferably less than 45%. (In general, the equilibrium conversion rate is about 65% as the concentration changes). flue gas SO 2 The concentration is about 12%, after which it is a conventional secondary conversion process. The flue gas at the outlet of the first section of the converter is cooled by the I hea...
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