Detection method for checking air leakage of non-oxidation heat treatment furnace radiant tube

Abstract

The invention relates to a detection method for checking air leakage of a radiant tube of a non-oxidation heat treatment furnace, and belongs to the field of equipment troubleshooting methods. The method comprises the steps of when a heat treatment furnace is in an ignition state, closing burners in all areas in the heat treatment furnace; reducing the residual oxygen amount in the heat treatmentfurnace to a specified numerical value, and igniting each burner zone by zone; detecting the residual oxygen amount in the heat treatment furnace after the single-area burner is ignited, and judging whether the residual oxygen amount is higher than a specified residual oxygen amount value; and closing the burner gas inlet pipeline of the heat treatment furnace higher than the specified value of the residual oxygen amount to finish detection and overhaul. According to the detection method for checking the air leakage of the radiant tube of the non-oxidation heat treatment furnace, the checkinglimit conditions are few, and almost no influence is caused to production. During production, after air leakage of the radiant tube is found, the furnace does not need to be shut down, cooled or inspected in the furnace, and the heat treatment furnace can be checked in an ignition state and is not influenced by the temperature of the furnace.

Description

technical field [0001] The invention relates to a detection method for checking air leakage of a radiant tube of a non-oxidation heat treatment furnace, and belongs to the field of equipment failure checking methods. Background technique [0002] Roll printing of heat-treated steel plates is a difficult problem in the industry. This problem has long plagued the quality stability and smooth production of heat treatment. There are two main measures to control steel plate roll marks: one is that the quality of shot blasting on the surface of the steel plate is good, that is, the oxide scale on the surface of the steel plate before entering the furnace is completely shot blasted; the other is that the heat treatment furnace has a non-oxidizing atmosphere, and the steel plate after shot blasting No secondary oxidation occurs in the furnace. The non-oxidation heat treatment furnace is heated by radiant tubes, and the protective atmosphere in the furnace is nitrogen. During prod...

AI Technical Summary

Problems solved by technology

[0005] 1. The investigation is restricted and difficult

It is necessary to enter the furnace for inspection after stopping the furnace to cool down. The air leakage of the radiant tube is difficult to find through visual observation, especially the part wrapped by the refractory material of the furnace wall and the position in contact with the hanging parts in the furnace cannot be observed at all, and the leak point cannot be confirmed by the naked eye. Location

[0006] 2. Poor positioning accuracy, time-consuming, laborious and costly

The original troubleshooting method is to pull out the suspected faulty radiant tubes one by one from the furnace for inspection, replace faulty ones, and reinstall them without faults. The number of existing burners for 1# furnace is 268 sets, two staffs work at the same time, and it takes at least 10 days to disassemble and assemble.

[0007] 3. High safety risk and equipment damage

The original method is labor-intensive, and the single weight of the burner and radiant tube is more than 300 kilograms. It is easy to cause safety problems when disassembling and assembling with driving, and the refractory material and equipment body are greatly damaged by disassembly and assembly.