Method and apparatus for utilizing the waste heat of the raw gas in the fixed bed gasification

摘要

In the process of fixed-bed gasification, considerable amounts of heat from the raw gas leaving the gasifier at about 400-600 ° C. have not been used to generate process steam since cooling of the raw gas laden with tar and dust below the tar dew point leads to contamination of the heating surfaces of a heat exchanger can. The illustrated method and the associated device are first a way to use this waste heat. In order to use the waste heat of the raw gas for the production of process steam in a medium-pressure steam generator, the raw gas temperature of the arranged in the raw gas flow heating surfaces of the medium-pressure steam generator and therefore the saturated steam temperature of the generated medium-pressure steam and the temperature of the feed water is generally maintained above the tar dew point of the raw gas. The invention relates to a method and the associated apparatus for utilizing the waste heat of the raw gas in the fixed bed gasification.