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Which gaseous fuel is produced by passing air and steam over waste coal?

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Which gaseous fuel is produced by passing air and steam over waste coal?

(a) Blast furnace gas

(b) Coal gas

(c) Mond gas

(d) Coke oven gas

I got this question during an online exam.

This intriguing question originated from Gaseous Fuels & Nuclear Fuels in section Steam Power Plant of Energy Engineering

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The correct choice is (c) Mond gas

Easy explanation: Mond gas is gaseous fuel that is produced by passing air and large amount of steam over waste coal at about 650^oC. It has a calorific value of 5800KJ/mm^3. The mond gas process was designed to convert cheap coal into flammable gas, which was made up of mainly hydrogen while recovering ammonium sulphate. The gas produced was rich in hydrogen and poor in carbon monoxide. Although it could be used for some industrial purposes and power generation, the gas was limited for heating or lighting.

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