process for simultaneous production of so2 - water and gas with low so2 content of the high so2 content

摘要

Combination gas, produced by burning sulphur, is cooled and then divided into two streams from one of which SO2 is absorbed in water and from the other a stream of SO2 diluted with air is obtained, the process being carried out under superatmospheric pressure which is maintained by a compressor which supplies a stream of compressed air which is divided into one stream for the combustion and another for the dilution, the cooling of the hot combustion gas being carried out in a first stage in which the gas, in direct contact with cooling water, is saturated with said cooling water and thereby cooled, preferably to about 100 DEG C., and then further cooled in a second stage in an indirect surface cooler, preferably to about 50 DEG C. If the second cooling stage is carried out at a higher level than the first the condensate separated from the gas in this second stage can by its own weight be caused to join the circulating cooling water used in the first cooling stage. The SO2 content of the diluted SO2 gas can be maintained constant by using a meter of said SO2 content to control the quantity of dilution air supplied and the quantity of combustion air can be simultaneously maintained constant by using a meter of said combustion air to control the output of the compressor.