Design Research And Experimental Study Of Petroleum Coke PowderOxyen-Enriched Burner

The oxygen-enriched burner which burned petroleum coke powder was the key device that used petroleum coke powder as an alternative fuel in oxy-fuel combustion. The design and experimental study of had a great significance for boosting energy efficiency, improving economic efficiency and optimizing China’s energy structure. Taking the new designed oxygen-enriched burner which burned petroleum coke powder as the object of study, this paper studied its aerodynamic field characteristics experimentally. And by the oxy-fuel combustion test of petroleum coke powder, both the temperature characteristics and the infrared thermometry of oxygen-enriched flame were analyzed.This paper studied the characteristics of cold flow field of the new burner designed. In this paper, low temperature tracer method and Infrared imaging temperature measurement were applied; the jet temperature field is analyzed. Experimental results indicate that, the burner has good aerodynamic field, the primary air has a bigger radial, whereas smaller axial temperature-speed gradient, and pure oxygen jet has a strong rigidity and it keeps a reasonable mixing distance from the primary air. The mixing effect of primary air’s flow field in the high-speed air jet burner is obviously influenced by the blunt body flaring and center pipe. Meanwhile, axis temperature, jet expansion angle, range, and center reflux area of the primary air all also present certain changing rules separately. This cold experimental method reveals the variation rules and mixing characteristics of flow field in an accurate and complete way, confirming the intimate connection between temperature and velocity field, and proving that it is scientific and reliable.Based on using the numerical simulation software, this paper studied the characteristics of cold flow field of the burner new designed. And it discussed the influence of the heat load and the outlet spacing between the primary oxygen and the primary air on the flow field. The results indicate that, the burner has good aerodynamic field, the flow field is stable and proportional. The recirculation zone is obviously influenced by the impact factors of heat load and the outlet spacing, which presents certain changing rules. The outlet spacing between the primary oxygen and the primary air has a significant impact only on the beginning of velocity field, and the velocity gradient of the whole flow field increases with the increasing heat load.At last, an oxy-fuel combustion test of petroleum coke powder was carried out on the horizontal furnace. The thermal infrared imager was used to study the temperature characteristics of oxy-fuel combustion. The results show that, the effect of burning petroleum coke powder under oxy-fuel combustion is good, the flame temperature is higher. With the flow of primary oxygen increasing, the temperature of whole flame increases and the temperature of the flame root decreases. When the flow of primary air increases, the rigidity of jet becomes stronger, the flame temperature is up at first and then down later. The nozzle structure of primary oxygen has a big impact on the root ignition of flame. The infrared thermometry of oxygen-enriched flame has large errors, and it’s proved that the error correction method suggested by the paper is scientific and effective.