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Wobbe index trimming of mixed gas

Wobbe index trimming of mixed gas

Wobbe index trimming of mixed gas

We are designing a gas mixing station for mixed gas - from coke oven gas and blast furnace gas.
The required calorific value (CV) of the mixed gas is 3000 kcal/Nm3.
The CV of the blast furnace gas is about 850 kcal/Nm3 and that of the coke oven gas is about 4300 kCal/Nm3.
To describe the mixing scheme:
we are controlling the pressure of coke oven gas (the major gas in this case). The flow of the blast furnace gas is being controlled as a ratio of the coke oven gas flow.
But, to ensure a CV of 3000kCal/Nm3 irrespective of change of pressure and CV of the BF & CO gas, I have to 'trim' the ratio of mixing, depending on the output of a CV (or, Wobbe index) analyser.
Can anyone suggest how to go about it?

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