80 



Indiana University Studies 



The Brazil coal is described in the report as being Brazil 

 Block bottom bed, screenings thru 13^-inch bar screen. 



Linton sample No. 1 is from Black Creek mine, bed No. 4, 

 run of the mine. 



Linton sample No. 2 was taken from the White Rabbit mine 

 bed No. 5, run of the mine. 



Ayshire sample was from mine No. 4, bed No. 5, lump. 



Dugger sample was from mine No. 4, bed No. 4, lump. 



Terre Haute sample was from Deep Vein mine, bed No. 4, 

 lump. 



Boonville sample was from Electric mine, bed No. 5, run 

 of the mine. 



Hymera sample was from mine No. 33, bed No. 5, run of the 

 mine. 



It will be seen that in average composition these coals will run 

 about 12 per cent moisture, 32}^ per cent volatile matter, 44 

 per cent fixed carbon, and 113^ per cent ash. The heat generated 

 in the combustion of coal comes from the carbon, hydogen, and 

 sulphur, tho the sulphur is usually present in such small quantities 

 that it has little effect on the heating value. In the burning of a 

 fuel these substances unite with oxygen from the air to produce 

 carbon dioxide, water, and sulphur dioxide. If the supply of 

 oxygen is insufficient, the carbon forms carbon monoxide instead 

 of carbon dioxide. The following heat values are given for these 

 reactions : 



One pound of carbon burned to carbon dioxide, 14,500 B.T.U. 



One pound of carbon burned to carbon monoxide, 4,400 B.T.U. 



One pound of hydrogen burned to water, 62,100 B.T.U. 



One pound of sulphur burned to sulphur dioxide, 4,000 B.T.U. 



One pound of carbon monoxide burned to carbon dioxide, 4,330 B.T.U. 



From the above data it will be seen that the ultimate analysis 

 of a coal is necessary for the calculation of its heating value. 

 There are several formulae in use for calculating the heating 

 value of a coal from its proximate analysis since the latter Is much 

 easier to determine than the ultimate analysis; but none of these 

 formulae is satisfactory, for they usually give results which vary 

 more or less from the true value. If oxygen is present in the coal, 

 it is considered to be in combination with some of the hydrogen, 

 and the heat of this combination is lost and must be subtracted 

 when the determination of the heat value of the coal is made. 



