A comprehensive text book of applied chemistry, Edition: 1st by Chander, Jagdish; Kumar, Anil
By Chander, Jagdish; Kumar, Anil
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However, today these compounds are mainly obtained from petroleum. iv) Ammonium compounds - These are produced during the destructive distillation of coal. When dissolved in water, they give ammonicalliquor. It is also employed for making nitrogenous fertilizer. ANALYSIS OF COAL Generally, coal is not analysed by measuring well defined physico-chemical properties as its composition varies according to the sources and age. However, consumer oriented, empirical test are usually performed for the sack of comparison and for getting some meaningful insights.
On the contrary high ignition temperature cause difficulty in igniting the fuel, but the fuel is safe during storage, handling and transportation. Hence a good fuel should have 'moderate' ignition temperature. 3. Low moisture contents - The moisture content of the fuel reduces the heating value and involves in a loss of money, because it is paid for at the same rate as the fuel. Therefor,e, an ideal fuel should have low moisture contents. Low non-combustible material - A good fuel must have low contents of non4.
In the fresh sample the moisture content is upto 60% however on suitably drying the moisture content reduces upto 10-15%. 5% Hydrogen = 5% Ash = about 4% Properties - It burns with long smoking flame and its calorific value is about 5500-7000 Kcal/kg. Uses - 1) Lignite is used as household fuel and for steam raising as boiler fuel. 2) It is also used in the manufacture of producer gas. iii) Bituminous Coal - It is the third stage of transfor-mation of wood into coal. This variety of coal is dark and opaque.