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Title: A Flameless Calorimeter Using Auto-Ignition Processes
Author: W. H. Vander Heyden, R. A. Berg
Source: 1999 International Symposium on Fluid Flow Measurement
Year Published: 1999
Abstract: A newly developed referencing calorimeter is described which performs with accuracy, provides rapid measurement, is robust and economic both in its initial investment and for continuing costs of ownership. A flow of gas is mixed with air and directed to a ceramic/platinum element (PIM) which is operated at a constant temperature above 800C. The temperature of the mixture rises rapidly when passing through the temperature gradient between the structure entrance and the PIM body. In passing through this gradient, all gas components are heated and auto-ignition temperatures are exceeded. Oxidation of the gas releases chemical energy which is immediately quenched transferring the heats of combustion to the PIM. Molar gas flowrate is measured using pressure methods. No catalysts are involved or required. The PIM temperature is maintained constant by changing the supplied electrical power. Combustion energy contacting the PIM is interchangable with electrical energy and is a direct measure of heat evolution. The PIM is confined within a structure designed to contain explosive conditions. Quenching is very effective, prevents flames and provides rapid cooling of combusted products. Measurement are made at the stoichiometric ratio or with excess air where the gas/air mixture is always maintained lean.

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