Original coal samples, proximate

TABLE 30.1 Proximate Analyses of the Original Coal Samples... 

The proximate analyses of the original coal samples are shown in Table 30.1. It should be noted that these measurements are for the single samples investigated and not for bulk samples, as reported in Ref. 7. 

The coal samples were HVB (ASTM rank) and originated from the Allegheny, Pottsville and Conemaugh formations in Ohio. Proximate... 

The thermogravimetric analysis (TGA) can be also used as a standardless alternative to determine the proximate analysis within approximately 80 min. In TGA, a small coal sample (20 mg) is heated under a flow of nitrogen with 80K/min until 160 °C is reached and held on this temperature until all moisture is removed. An increase of the temperature to 950 °C removes the volatiles and after stabilization of the curve, air is finally introduced to convert the remaining fixed carbon. Relating to the original mass of the sample, the moisture, volatile matter, fixed carbon, and ash content are determined within the error limits of the standard method. 

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