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Title: A Flameless Calorimeter
Author: Ronald A. Berg, Jan G. Drenthen
Source: Flomeko 2000
Year Published: 2000
Abstract: This paper describes the design and operation of a new reference calorimeter based on a flameless combustion technique. Within this technique, a mixture of (reference) gas and air is passed over a noble metal element that is electrically heated to a constant temperature. The gas is oxidized as it encounters the temperature of the noble metal element and rises above auto-ignition temperature within a small combustion cavity. The precise value of the electrical energy, required to heat the element, is stored. The same procedure is again carried out with the (unknown sample) gas and the same air supply. The ratio of the value of the electrical energy now required to heat the element and the reference electrical energy, is inversely proportional to the ratio of the calorific values of the two gases. The new instrument meets the ASTM 4891 standard and is designed to be integrated into a complete energy measurement system with an expected uncertainty in heating value of better than 0.25% and a repeatability better than 0.15%. The first test results of the instrument measuring low calorific- and high calorific gases are shown. The Method A method has been developed which directly and accurately

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