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Fuels and Combustion

Fuels and Combustion
Bulk density of pulverised coal may be about __________ kg/m³.

100
1500
500
1000

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Fuels and Combustion
Which of the following reactions occuring during coal gasification is called the Neumann reversal reaction?

CO + H₂O ⟷ CO₂ + H₂
C + 2H₂O ⟷ CO₂ + 2H₂
C + H₂O ⟷ CO + H₂
2CO ⟷ C + CO₂

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Fuels and Combustion
Which of the following fuel gases will require maximum amount of air for combustion of 1 Nm³ gas ?

Blast furnace gas
Natural gas
Water gas
Producer gas

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Fuels and Combustion
A coal gasifier opearating at 20 atm. (e.g. Lugri gasifier) as compared to one operating at atmospheric pressure (e.g. Kopper-Totzek or Winkler gasifier) will produce a gas having

Lower carbon dioxide content
Higher carbon monoxide content
Higher methane content and thus higher calorific value
None of these

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Fuels and Combustion
Low temperature oxidation and spontaneous combustion of freshly mined coal is accentuated, if

It is stored in tall heaps
Smaller fines are stored in large quantity
All of these
It contains large amount of volatile matter

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Fuels and Combustion
Percentage of hydrogen in coke oven gas may be around

10
25
60
45

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