Furnace Technology
Air filtration in a furnace

None of these
Reduces its thermal efficiency
Increases the flue gas temperature
Is indicated by flame sting out

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Furnace Technology
In practical operation of any furnace, zero oxygen percentage or theoretical CO₂ percentage in flue gas is rarely achieved, because of

Use of non-preheated combustion air
Use of pulverised solid fuels
Use of excessive positive draft in the furnace
Imperfect mixing of fuel & air and infiltration of air

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Furnace Technology
The reason for excessive clinker formation in gas producers is the

Development of hot spots in the fuel bed and an abnormally high rate of gasification
Use of fuel having too low an ash fusion temperature
All of these
Use of coal/coke containing a high % of fines and ash

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