Question

Which fuel is the final stage in the formation of coal?

(a) Bituminous coal

(b) Anthracite coal

(c) Peat

(d) Lignite

The question was posed to me in unit test.

Enquiry is from Types of Fuels topic in section Steam Power Plant of Energy Engineering

Answer 1

Right option is (b) Anthracite coal

The explanation: Anthracite coal is called final stage of transformation of buried vegetation into coal. It is non-caking and has highest calorific value of about 35500 kJ/kg. It burns at high temperature and is smokeless. It consists of 91% C; 3% H2; 2.5% O2; 0.5% N2; 0.5% S and 2.5% ash. It is also used as a boiler fuel.