Fuels and Combustion - Chemical Engineering Questions and Answers

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To avoid fire by spontaneous combustion of coal due to its low temperature oxidation, it should be stored in

shallow and small piles.

fine sizes without the presence of any lump.

closed space without any ventilation facility.

large heaps with small surface to volume ratio.

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Artificial draught produced by a fan can be controlled by the

speed of the fan.

damper.

variation in the pitch of the fan blades.

all (a), (b)and(c).

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Water gas constitutes mainly of

CO & H₂

CO & N₂

CO₂ & H₂

CH₄ & H₂

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Coke made in narrower by-product coke ovens (as compared to wider ovens) is

less reactive

stronger

smaller in size

all (a), (b) & (c)

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Main constituent of the gas produced from a gobar gas plant is

CO₂

CH₄

H₂

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

convert CO to CO₂.

increase the combustion rate.

increase the gas production rate.

minimise the chances of clinker formation.

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In general, the limit of inflammability/explosion limit of fuel gases is widened by the

increase in gas pressure.

increase in temperature (i.e. preheating).

use of pure oxygen for combustion instead of air.

all (a), (b) & (c).

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Caking coal is desirable for

burning on travelling grate.

coke making.

burning on firebars.

all (a), (b) and (c).

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Blast furnace gas compared to coke oven gas has

lower ignition temperature.

narrower limit of inflammability.

higher calorific value.

lower theoretical flame temperature.