Ultimate Analysis: Ultimate analysis is complete breakdown of coal into Chemical constituents. This analysis is important for large scale trials. It serves the basis For calculation of the amount of air required for complete combustion of 1kg of fuel. It gives percentage content on mass basis of carbon, hydrogen, oxygen, Sulphur and ash. We are able to calculate the Calorific value of coal. In ultimate analysis a complete breakdown of coal into its chemical constituents is carried out by chemical process. This analysis is important for large scale trials i.e. boiler trial. This analysis useful for calculation of amount of air required for complete combustion of 1 Kg. of coal. This analysis gives percentage of carbon, hydrogen, oxygen, sulphur and ash on mass basis their sum is taken as equal to 100%. In this analysis moisture is consider as separate item. This analysis is also used to determine calorific value of the coal.
Proximate Analysis: Proximate analysis is complete breakdown of coal into physical constituents without knowledge of analytical chemistry. This analysis made By means of a chemical balance &temperature control Furnace. The component in The analysis is fixed carbon volatile matter, moisture& ash. This is used to calculate The heating value of coal.In this analysis separation of coal into its physical components. This analysis made by means of chemical balance and temperature controlled furnace. In this analysis sample is heated into furnace. The components in analysis are fixed, carbon, volatile matter, moisture and ash. These components are expressed in percentage on mass basis and their sum is taken as 100% sulphur is determined separately. This analysis also used to determine heating value of the coal.