Fuels and Combustion
Which of the following fuels is generally not used in thermal power plant boiler firing?

F. gas, coke oven gas and L.D. converter gas
Pulverised coking coal
Furnace oil, light diesel oil and tar/PCM
Coal middling from washeries

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Fuels and Combustion
A sample of natural gas containing 80% methane (CH₄) and rest nitrogen (N₂) is burnt with 20% excess air. With 80% of the combustibles producing CO₂ and the reminder going to CO, the Orsat analysis in volume percent is

CO₂ : 6.39, CO : 1.60, O₂ : 3.99, H₂O:25.96, N₂:72.06
CO₂ : 6.26, CO : 1.56, O₂ : 3.91, H₂O :15.66, N₂ : 72.60
CO₂ : 7.60, CO : 1.90, O₂ : 4.75, N₂ : 85.74
CO₂ : 7.42, CO : 1.86, O₂ : 4.64, N₂:86.02

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Fuels and Combustion
Sometimes water is sprayed during coal charging in the coke oven, which helps in

Reducing the cracking of hydrocarbons in the gas and increasing the percentage of CO & H₂ in the gas (due to the endothermic reaction represented by C + H₂O = CO + H₂)
Prevention of clinker formation in the oven
Controlling the dust nuisance while charging the coal
All of these

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