Patent ID: 6446487
Filing Date: 2002-09-10
Classification: G01N

Abstract:
A direct method for measuring and/or regulating a quantity of heat contained in a fuel gas, using the calorific value of the fuel gas as an input parameter, wherein said calorific value is measured value, inputted once, or a value measured and inputted at regular intervals or continuously, comprisinga) guiding the fuel gas or a part-stream of the fuel gas through a volumetric meter or a mass flow meter, and measuring the volumetric flow rate or the mass flow rate, b) determining the speed of sound of the gas under first reference conditions, c) recording one of the measurement variables selected from dielectric constant, speed of sound under second reference conditions, carbon dioxide content of the fuel gas, nitrogen content of the fuel gas and density under standardized conditions, d) calculating required densities values or a density correlated calorific value, and e) deriving the quantity of heat supplied from the parameters obtained in b)-d) and from the measured value for the calorific value of the fuel gas, as a measurement variable or control variable.