Method of reducing volatile pollutants in the exhaust gases from a heat exchanger system
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United States of America Patent
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-
Dec 4, 2001
Grant Date -
N/A
app pub date -
Jul 6, 2000
filing date -
Aug 3, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In the method according to the invention for reducing volatile pollutants in the exhaust gases of a heat exchanger system for heating of cement raw meal or the like, partially preheated raw meal is heated to a temperature for release of the pollutants contained therein. In order to be able to achieve this with a reliable mode of operation and with relatively low investment costs, partially preheated raw meal is drawn off from an upper preheater stage and is mixed together in a mixing zone with a fraction of raw meal which is already highly heated and of such a size that the raw meal mixture which is obtained is set to a mixing temperature which releases the pollutants and as a result at least volatile sulphur oxides are incorporated into the raw meal mixture, whilst carbon monoxide formed in the course of this is led off by means of a carrier gas. The raw meal mixture containing the incorporated sulphur oxides is conveyed out of the mixing zone and introduced into a suitable preheater stage for further heating.
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