Everything about Water Gas totally explained
Water gas is a
synthesis gas, containing
carbon monoxide and
hydrogen. It is a useful product but requires careful handling because of the risk of
carbon monoxide poisoning. The gas is made by passing
steam over red-hot
coke:
» C + H
2O → CO + H
2
The reaction is
endothermic so the coke must be continually re-heated to keep the reaction going. This was usually done by alternating the steam stream with an air stream.
Variations
Water gas had a lower
calorific value than
coal gas so the calorific value was often boosted by passing the gas through a heated retort into which oil was sprayed. The resulting mixed gas was called
carburetted water gas.
Semi-water gas is a mixture of water gas and
producer gas made by passing a mixture of air and steam through heated coke. The heat generated when producer gas is formed keeps the temperature of the coke high enough to allow water gas to be formed.
Pure
hydrogen can be obtained from water gas by using the
Water gas shift reaction.
Further Information
Get more info on 'Water Gas'.
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