Why Is Consistency in Hydrocarbon Important for Boiler Performance?

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Why is consistency in hydrocarbon important for boiler performance?

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It starts from combustion air calculation; the carbon hydrogen ratio decides the quantity of combustion air.

Flame temperature is dictated by the chemical composition of the fuel, and this changes the furnace behavior.

The completion of combustion is another very important factor in industrial boiler design. This will depend on how the hydrocarbon rings are formed and bonded. If the coal burns slowly requiring more residence time then the SH and RH (superheater and reheater) behavior changes when compared to the fast burning coal. This will lead to large injection in SH and/or RH which will reduce the life of the tubes and also reduce boiler efficiency.

The amount of unburned material in fly ash and bottom ash of the boiler can change, and, if it increases will increase fuel requirement, maybe only marginally.

Lack of consistency can lead to loss of the capability to generate when the ash level increases beyond a threshold of the fuel preparation system capacity. This can also lead to limitations on the fuel handling system.

Why is coal fuels different?

All fuels are hydrocarbons

Gas and oil have defined hydrocarbons and structure, which means C & H in fuel does not vary much

Coal is a heterogeneous fuel and has only an assumed structure – C & H vary highly

C & H in Coal can be only be known if you do an ultimate analysis, and the way in which these hydrocarbon behave can be different from one coal...