Fuels and Combustion
The sequence of absorption in flue gas analysis by Orsat's apparatus is respectively

O₂, CO₂, CO
CO₂, CO, O₂
CO, O₂, CO₂
CO₂, O₂, CO

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

Controlling the dust nuisance while charging the coal
Prevention of clinker formation in the oven
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)
All of these

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