| 摘要 |
Sulfur trioxide is produced by generating sulfur dioxide gas from raw material in a furnace which gas is cooled, cleaned and dried to form cold gas which is then reheated to its corresponding catalytic kindling temperature by passing it through a first heat exchanger, following which the heated cold gas is passed through a first group of catalytic converters. The sulfur trioxide formed is then cooled and removed from the gas stream in a first or intermediate absorber. The remaining tail gas from the first absorber is reheated by heat exchange with hot gas by means of heat exchangers serially connected to the first group of converters and the thus-heated tail gas then finally converted in a last stage catalytic converter to sulfur trioxide which is recovered in a second absorber, this process being known as the double absorption process.
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