Temperature of a furnace fired with low calorific value fuel gas (i.e. lean gas) can be increased by______________________?
Correct answer: B. All A., B. & C.
- A. Preheating the combustion air
- B. All A., B. & C.
- C. Preheating the fuel gas
- D. Oxygen enrichment of combustion air
Explanation
Preheating either reactant reduces the heat required to reach flame temperature, while oxygen enrichment reduces the inert nitrogen load and raises the adiabatic flame temperature. Thus, all three measures can increase furnace temperature.
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