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Proximate & Ultimate Analysis of Coal / Moisture, Volatile Matter, Ash, Fixed Carbon in

Coal [Hindi]
Analysis of Coal

X

There are two methods: ultimate analysis and proximate analysis. The ultimate analysis determines all coal component elements, solid or gaseous and the proximate analysis deter mines only the fixed carbon, volatile matter, moisture and ash percentages. The ultimate analysis is determined in a properly equipped laboratory by a skilled chemist, while proxi mate analysis can be determined with a simple apparatus. It may be noted that proximate has no connection with the word "approximate". Measurement of Moisture Measurement of Volatile Matter Fresh sample of crushed coal is weighed, placed in a covered crucible, and heated in a furnace at 900 ± 15°C. For the methodologies including that for

Determination of moisture is carried out by placing a sample of powdered raw coal of size 200 micron size in an uncovered crucible and it is placed in the oven kept at 108+2°C along with

the lid. Then the sample is cooled to room temperature and weighed again. The loss in weight represents moisture.carbon and ash, refer to IS 1350 part 1:1984, part III, IV. The sample is cooled and weighed. Loss of weight represents moisture and volatile matter. The remainder is coke (fixed carbon and ash).volatile matter. The remainder is coke (fixed carbon and ash).

Measurement of Carbon and Ash

The cover from the crucible used in the last test is removed

and the crucible is heated over the

Bunsen burner until all the carbon is burned. The residue is

weighed, which is the incombustible

ash. The difference in weight from the previous weighing is the fixed carbon. In actual prac

tice Fixed Carbon or FC derived by subtracting from 100 the

value of moisture, volatile matter and ash.

Proximate Analysis

Proximate analysis indicates the percentage by weight of the Fixed Carbon, Volatiles, Ash, and

Moisture Content in coal. The amounts of fixed carbon and volatile combustible matter directly Also Check Out These

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