By Wilfrid Francis
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Additional info for Fuels and Fuel Technology. A Summarized Manual
Sample text
10 mm to 0 from washed coal before sending to market. Best results are with dry coal. 5 m wide and 1 to 3 m long. g. 3 mm. 3. Hand Picking Large screened coal > 100 mm is placed on a slowly moving "picking belt" of about 30 m length and a team of about six workers pick out obvious pieces of shale or dirt. Output per manshift is 10 to 12 tons, with high efficiency of separation. With smaller sizes efficiency and output fall rapidly. 4. Crushing or Breaking Process is designed to reduce the size of large pieces with minimum production of dust.
1) are mounted horizontally and revolve in opposite directions. ) Alternatively, a single roll may revolve against a breaker plate. m. p. Best results are obtained by the use of several rolls in series, with screens between. 58 [10] Solid Fuels FIG. 1 Diagram of double-roll crusher. References PERRY, J. H. Chemical Engineers Handbook, New York, 1953. Data Sheet No. 11 Coal Preparation— Mechanical Cleaning— Theory Objective To reduce the amount of ash formed from the coal in a combustion appliance to an acceptable degree, in an economical manner.
If the curve is more nearly straight, the coal is hard to clean and a high proportion of "middlings" is obtained (coal of medium to high ash content). 6. A middlings curve (specific gravity distribution curve) is sometimes drawn by plotting the difference in yields at two chosen densities against the mean of these densities. 1 of a given density. If this weight is less than 10% the coal is easy to clean. Theory of Cleaning by Jigging or Washing The terminal velocity of a solid particle settling in a fluid is determined by the opposing forces of gravity and frictional resistance.