Numerical study of the flow and heat transfer due to the changing of the burner angle in a П-type boiler

This research was carried out to optimize energy consumption in Isfahan Steel P-type boilers by numerical modeling of heat transfer in combustion chamber at different angles of natural gas fuel burner. Using the Ansys-Fluent combustion chamber modeling software, four natural gas burners, 187 firefighting tubes and its refractory walls were used. The results show that changing the angle of the burner is a good way to control the flame. By decreasing the angle of the burner, the heat flux on the firebox tubes the temperature and fluid velocity inside the combustion chamber increases and thus improves the boiler efficiency. However, reducing the angle of the burners results in an increase in the surface temperature of the fire pipes and can even pierce and damage the equipment. The results also showed that with constant amount of gas consumed, the ratio of radiation heat transfer to total heat transfer of firewall tubes at different angles is 90% on average. Also the agreement between numerical and experimental results including the existing boiler condition in which the burner at 30 ° angle confirms the modeling accuracy.