By comparative test on the surface temperature distribution of W-type radiant tube with different burner structure，the main factors having effect on tube temperature uniformity for coaxially parallel jet burner are analyzed.
By comparative test on the surface temperature distribution of W-type radiant tube with different burner structure, the main factors having an effect on tube temperature uniformity for coaxially parallel jet burner is analyzed. The results show that the temperature of the forepart tuber elevates. Meanwhile, the temperature of the posterior tube decreases with the increase of gas speed. At the same time, the temperature of the forepart tuber decreases while the temperature of the posterior tube changes very little with an increase of gas speed. When the proportion of second air increases the tuber temperature decreases. Yet, the proportion of second gas has little effect on it.
Based on the principle of indirect heating radiant tube heating technology effectively avoids the heated surface oxidation and decarburization. The protective atmosphere creates the condition for the combustion gases. So the product will not cause pollution to affect product quality. Especially suitable for high-quality requirements.
The earliest radiant tube furnace invented and used in Germany in the 1930s. The structure was a single straight tube horizontally or vertically through the furnace. Until the early 1950s, U-type radiant tubes came out. Furthermore on this basis, develop this radiant tube, casing tube-type I, as well as exhaust gas recirculation of P and O type, etc.
The radiant tube relative to other types of radiant tube has the advantages of large burner space. And also has large heat transfer area and high thermal efficiency. But at the same time, this radiant tube burner also has difficult development problems because of the length of the tube. Many factors influencing the length of the flame tube and the poor temperature uniformity along the length direction of the W-type radiant tube.