|
High temperature air combustion technology of the 20th century, 80 years to promote the field of international combustion applications a new combustion technology . In order for high temperature air combustion technology can ring in an asymmetric heating furnace to be applied better on paper using RNG k-ε turbulence model, non-premixed combustion model , P-1 model of radiation heat transfer , thermal NOX generation type model for the use of blast furnace gas double preheating regenerative rotary furnace combustion and emission characteristics of a numerical simulation analysis through different streams cross the burner nozzle distance, preheat temperature , load and other industrial burners conditions to study the flow of regenerative rotary furnace , combustion , NOX formation and emission characteristics. The results showed that the jet from the burner to the flow cross section due to the influence of different levels of the jet axis inclined downstream . Closer to the upstream of the burner section of the jet stream by the more significant effect , with respect to the jet axis of the combustor far upstream of the jet inclination more serious. The same conditions, the air and sprayed into intersecting the axis angle, the smaller the size of the flame , the reference plane , the maximum combustion temperature is higher; nozzle the greater the distance , the shorter the flame length , the reference plane , the maximum combustion temperature is low ; preheating temperature improves combustion stability , so that the reference plane , the maximum combustion temperature and the average temperature of the combustion chamber significantly increased ; with the burner load increases, the reference plane , the maximum combustion temperature and an average combustion chamber temperature rises , and the average combustion chamber temperature than the reference plane , the maximum combustion temperature rises fast. When the burner is less than 70 % of the rated load condition, the furnace temperature distribution is not uniform , the average furnace temperature is relatively low , it is difficult to meet the requirements of combustion characteristics . Compared with ordinary combustion , using regenerative combustion , within the annular furnace NOX formation less involved in this study working conditions in , NOX emissions from a minimum of 16.5 ppm, a maximum of 157 ppm. Preheat temperature and the nozzle distance is greater than the impact of NOX emissions stream crossing burner and burner load on the impact of NOX emissions .
|