Abstract
This chapter describes determination of the calorific value of coal, coke, and nonvolatile oils. This determination for solid fuels is best carried out in the bomb calorimeter to the methods laid down precisely in B.S. 1016 Pt. 5, A.S.T.M. D2015, or I.S.O. 1928. Bomb is made of Austenitic Cr–Ni–Mo steel (resistance to corrosion) of capacity 250 to 300 ml and of sufficient strength to withstand the combustion of 1 g of coal or oil in oxygen at an initial pressure of 30 atm (B.S. 4791). During the determination, the bomb is immersed in 2 L of water in a calorimeter vessel, surrounded first by an air space, approximately 10 mm thick, and then by a lagged water jacket containing at least 12.1 L of water. The calorimeter vessel is fitted with an adequate stirring device and a carefully calibrated thermometer, with a range of 5 or 6 K by intervals of 0.01 K, capable of being read, with a traveling lens, to 0.001 K. The preliminary period and after period readings are then taken. From these readings, a graph may be drawn, from which the true temperature rise may be deduced.
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