MODELING OF THE PROCESS OF PRIMARY AIR SUCTION IN A HOUSEHOLD GAS BURNER ON BIOGAS FUEL

Abstract

Statement of the problem. The process of suction of primary air into the housing of a gas burner device for domestic use during the combustion of gas fuel with different methane content in the composition is considered. It is necessary to develop a computer model of the movement of the gas-air mixture for a gas with a methane content of 50 to 90 % vol., with varying the height of the primary air regulator H from 0 to 19.25 mm and determine the concentration of O2 in the gas-air mixture at the outlet of the openings of the gas burner device, based on the results obtained, determine the rational dimensions of the primary air supply regulator. Results. The results of computer simulation of primary air suction by a flow of combustible gas inside the gas burner housing when using combustible gas with different methane content in the composition using the Ansys Fluent software package are presented. 3D modeling of the design of a gas burner equipped with a primary air supply regulator has been performed. The process under study was carried out by varying the methane content in the composition of the gas used and the height of the primary air regulator. The dependences of the oxygen content in the composition of the formed gas-air mixture on the composition of the combustible gas were determined, which made it possible to obtain the required dimensions of the primary air regulator.Conclusions. As a result of computer modeling, it was found that with a decrease in the methane content in the composition of the combustible gas, it is necessary to use a primary air regulator with a higher height H, which will ensure the suction of a smaller amount of primary air to ensure complete combustion of the combustible gas of the adopted composition.