Fuels and Combustion
Steam is intermittently admitted into the fuel bed during the production of producer gas to

Convert CO to CO₂
Increase the gas production rate
Increase the combustion rate
Minimise the chances of clinker formation

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Fuels and Combustion
Fuel gases containing hydrocarbons (ie.g. coke oven gas) are not preheated before burning, mainly because

The hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot
There are chances of explosion during preheating
It reduces its calorific value tremendously
It reduces its flame temperature tremendously

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