Water Gas (continuous process):
Raw materials: Steam, coal, oxygen
Reactions:
Process description: This process was invented in 1940 by Germans. This process is based on use of tonnage or low purity grade oxygen made by air separation procedure. The correct ratio of steam, oxygen and coal is added to the reactor to yield a selfsustaining reaction of approximately zero heat release. Subsequent innovations allow for ash content >30% so Indian coal can be used in this process.
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Water Gas (regenerative process):
The plant is provided with two generators one operates on blow period which heats carbon and the other on a run period where exothermic reactions occur. During the steam run water gas is produced. This is come out through an exit near the top and collected. During the air run warming up process when air is blown in the products of combustion mainly Nitrogen,CO2,CO are allowed to pass into the atmosphere