Radiant tube combustor

Abstract

The invention relates to a radiant tube combustor and belongs to supporting facility of heating or annealing furnaces. The radiant tube combustor comprises an installation fixing plate, a radiant tube with a first patching base and a second patching base, a combustion air preheating mechanism fixed to the installation fixing plate together with the first patching base, a combustion mechanism fixed to the installation fixing plate together with the second patching base and arranged parallel to the combustion air preheating mechanism, and a hot air transition mechanism arranged between the combustion air preheating mechanism and the combustion mechanism. The radiant tube combustor is characterized in that the combustion air preheating mechanism comprises a fume discharge shell, a group of heat exchange tubes, a fume discharge shell fixed base, a fume pipe and a spacer bush, wherein each heat exchange tube is provided with an air inlet and an air outlet. The radiant tube combustor has the advantages of reducing the temperature of discharged fume so as to be beneficial to environment protection and saving energy consumed by the combustion mechanism.

Description

technical field [0001] The invention belongs to the technical field of supporting facilities for heating or annealing furnaces, and in particular relates to a radiant tube burner. Background technique [0002] Radiant tube burners are not limited to the following examples, such as continuous annealing furnaces for steel strips, reduction annealing furnaces for continuous hot-dip galvanizing production lines, metal smelting furnaces, metal heat treatment furnaces, and various vertical and horizontal furnaces. . The radiant tube burner is mainly composed of a fixed wall panel of the furnace body, which is usually called a fixed plate, a radiant tube, a combustion air preheating mechanism, a hot air transition mechanism and a combustion mechanism. See the instructions and drawings of the radiant tube heating device. The technical gist of CN201162030Y is to set an insert in the rear section of the W-shaped or U-shaped radiant tube, that is, the radiant tube section of the four...

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Problems solved by technology

However, practice has proved that the fin structure cannot raise the temperature of the combustion-supporting air to the desired level. The aforementioned CN2295983Y preheats the air to 350-450°C, while CN201163160Y preheats the air to 370-420°C

[0004] The structure of the combustion mechanism can also be found in the patent literature. Representatively, CN2688011Y discloses a silicon carbide radiant heater, publication number CN101266041A discloses a radiant tube burner and CN201269527Y recommends a radiant tube nozzle, which The first patent among the three patented technologies is characterized by the use of silicon carbide tubes as the outer tube of the heater (that is, the outer tube of the burner), which can improve the temperature resistance of the outer tube of the heater, and the latter two patents can reflect the two characteristics of the airflow. Secondary mixed combustion, but the installation and maintenance of the burner (such as eliminating carbon deposits) are troublesome, especially because the combustion air preheated by the combustion air preheating mechanism cannot be rotated in advance after the hot air transition mechanism is introduced into the combustion mechanism The flow state reaches the burner, so the mixing of combustion air and gas does not reflect the ideal mixing effect

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