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Title: Measuring Calorific Value-Evaluation Of A New Concept
Author: William H. Clingman, Jr.
Source: American Gas Association 1976
Year Published: 1976
Abstract: In a previous paper a new method was presented for measuring the calorific value of natural gas. The ratio of air to fuel which maximizes the adiabatic flame temperature of natural gas-air flames was shown to be proportional to calorific value. The method was based on that property. This relationship was established using the known thermodynamic properties of Ihe gases in the combustion zone. Deviations from ihe theoretical relationship for various gas compositions were derived. These results are shown in Table I. The error was calculated for measuring the calorific value of a number of mixtures of methane with a second gas. It was assumed that the measurement method was based on the above principle and that pure methane was used for cahbration. In Table 1 is given the percent of the second gas which introduces as 1 BTU/SCF error. It can be seen that the only constituents that would introduce errors of a few BTU/SCF are hydrogen, carbon monoxide, and oxygen. The effects of hydrogen and carbon monoxide are opposite to each other and will tend to cancel if both are present. There will be no error if the ratio of hydrogen to carbon monoxide is three to one.

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