SIMULATION OF THE INFLUENCE OF NATURAL GAS COMBUSTION HEAT ON THE MEASUREMENT OF ITS CONSUMPTION BY END NOZZLES

Abstract

The analysis of known normative documents and technical decisions for determination of heat of combustion of natural gas is carried out. The patent-protected method and algorithm of combustion heat control are described, which is based on measuring the combustion temperature of gas under the condition of measuring the consumption of natural gas with the help of special narrowing devices - end nozzles. Using computer simulations, the relationship between the physical characteristics and component composition of natural gas with its heat of combustion under the condition of measuring gas flow with end nozzles was studied. Algorithmic dependences between the heat of combustion of natural gas and its compressibility coefficient, which is determined by the influence of gas density and the content of non-combustible components, are obtained. The influence of changes in the density of natural gas on the coefficient of compressibility and heat of combustion of gas compared with the change in the content of nitrogen and carbon dioxide was quantified. The influence of gas density and nitrogen content on the adiabatic index and the coefficient of gas expansion when measuring the flow with the end nozzle of the burner was studied. The simulation results allowed to propose an iterative-experimental method of calculating the heat of combustion of natural gas in its experimental determination without direct measurement of gas density.