A flat double p-type radiant tube

Abstract

The invention discloses a flat double P type radiant tube which comprises a first straight tube, a three-way tube, a second straight tube, a third straight tube, a first bent tube and a second bent tube. A burner is fixed into a first straight tube mounting pipe, a central spray tube is a gas jet, four spray tubes on the outer side are air jets, the sections of all the spray tubes are elliptic, the proportion of a long edge and a short long edge of an ellipse is as same as that of a long edge and a short long edge of the section of a radiant tube body, and the first straight tube and the three-way tube are thickened. The flat double P type radiant tube has the advantages that the thickened first straight tube can effectively prevent tube wall failure caused by high-temperature corrosion, the thickened three-way tube can prevent bent tube deformation caused by heat stress, and the section of the radiant tube body is elliptic. Compared with a circular radiant tube consuming the same alloy steel, the effective radiant area of the radiant tube for a workpiece is enlarged, and the heat exchange amount of the radiant tube and the workpiece within unit time is increased. Burning flame diffuses towards two sides of the radiant tube, the radiant temperature of two side wall surfaces of the radiant tube is increased, and the temperature of the radiant tube is uniformly distributed.

Description

technical field [0001] The invention relates to a gas radiant tube heating device, which improves the tube body shape and burner structure of the radiant tube, and is mainly applied to the flat double P-type radiant tube of a heating furnace for heat treatment under a protective atmosphere. Background technique [0002] Metal heat treatment can make the heated metal have good properties, and the heating process is mostly carried out under a protective atmosphere, which can effectively prevent the heated element from overheating, overburning, decarburization and oxidation in the furnace. At present, the most common heat treatment heating methods are electric heating and gas heating. Compared with electric heating, gas radiant tube heating has the advantages of large thermal power per unit surface area, high thermal efficiency, and low operating costs. [0003] The radiative heat transfer of the radiant tube wall to the workpiece directly affects the overall energy consumption...

AI Technical Summary

Problems solved by technology

The above two situations have a great influence on the service life of the radiant tube

[0006] For gas radiant tube heating devices, the surface temperature uniformity of radiant tube combustion is an important indicator to measure the performance of radiant tubes. Traditional radiant tube structures (U-type and W-type) do not use the flue gas recirculation backflow structure, so the flame center The temperature is high, and the surface temperature difference of the radiant tube is large. The flat double P-type radiant tube has a flue gas return structure, which greatly reduces the central temperature of the flame and improves the uniformity of the surface temperature.

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