Abstract:
This paper analyzed the heat transfer process of the burner rim during the process of non-catalytic partial oxidation of gas hydrocarbon by means of numerical simulation. The influences of the nozzle channel configuration on the combustion process in the partial oxidation reformer and the heat transfer process of burner rim were investigated. The results showed that the three-channel burner, which makes the inner channel flow oxygen, the middle channel flow carbon dioxide and the outer channel flow gas hydrocarbon, can increase the distance between the high temperature region and burner rim. Therefore, the three-channel burner could reduce the heat transfer of the burner rim. As a result, the three-channel burner led to a decrease in the temperature of the outer rim surface. The two-channel burner uses carbon dioxide to dilute oxygen by means of making the inner channel flow both carbon dioxide and oxygen. The method of diluting oxygen by carbon dioxide in the partial oxidation burner could reduce the intensity of the combustion, which made the combustion temperature in the furnace lower, especially near the burner rim. The lower combustion temperature could reduce the amount of radiation heat transfer in the two-channel burner rim. Therefore, the temperature of each burner rim in the two-channel burner was lower than that in the three-channel burner. Meanwhile, the two-channel burner could also improve the thermal stress distribution of the burner rim. The two-channel burner had more advantages in burner rim temperature and thermal stress distribution compared with the three-channel burner.