Furnace Technology
In producer gas making furnace, steam is added along with air to mainly control the

Temperature of producer gas
Tar content in producer gas
V. of producer gas
Fusion of coal ash & clinker formation

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Furnace Technology
In a furnace employing forced draught as compared to induced draught,

None of these
Positive pressure exists in the furnace
The fan operates hot and hence blades are liable to corrosion and erosion
Air is sucked in, so air leaks are more and hence the furnace efficiency is reduced

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