SIMULATION OF BIOGAS COMBUSTION IN INJECTION BURNER WITH HEAT DIVIDER

Abstract

The purpose of this work is to develop a design of a biogas combustion equipped with a thermal divider and study the process of burning biogas of different composition. To study the biogas combustion process in the burner of the developed design, the Ansys Fluent modeling software package is used. An injection burner for biogas combustion with a cone-shaped thermal divider and primary air regulator has been developed. Studies of the process of burning biogas of different composition in burners of 5 designs were carried out: without a divider, with a divider with a length of L = 6 mm, with a divider L = 12 mm, with a divider L = 18 mm and a divider L = 24 mm. As a result of modeling, it is found that the placement of a divider with a length of 6 mm and 12 mm does not affect the temperature of the gas-air mixture in the burner body. Increasing the length of the divider to 18 mm allows to increase the temperature of the flow of the gas-air mixture passing along the divider. A further increase in the length of the divider to 24 mm leads to a slight increase in the temperature of the gas-air mixture. The dependences of the flame temperature on the length of the divider during the combustion of biogas with a methane content of 60% and 70% are obtained. When a divider with a length of 6 mm and 12 mm is placed in the burner body, the flame temperature decreases, with an increase in the length of the divider to 18 mm, the flame temperature increases, and with an increase in the length of the divider to 24 mm, the flame temperature remains practically unchanged. Consequently, the placement of a divider with a length of 18 ... 24 mm in the burner body ensures preliminary heating of the gas-air mixture and allows increasing the efficiency of the biogas combustion process.