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Online detection method for leakage of W-shaped radiant tube of annealing furnace

A detection method and radiant tube technology, which can be applied in the direction of detecting the appearance of fluid at the leak point, measuring device, using liquid/vacuum degree for liquid tightness measurement, etc., can solve the problem of insufficient combustion of gas, easy damage of exhaust pipe, The radiant tube is easy to become brittle and damaged, which can save manpower and time and ensure the quality of production.

Inactive Publication Date: 2020-01-10
TANGSHAN IRON & STEEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The W-type radiant tube will be cracked and damaged during use. On the one hand, the reason for the crack is the direct welding between the smoke exhaust part of the radiant tube and the furnace shell. After the radiant tube is heated. The radiant tube expands both radially and axially. Due to the temperature difference between the radiant tube and the furnace shell, the radiant tube will crack along the weld after being heated and expanded. On the other hand, the radiant tube requires an oxidative combustion atmosphere. Prevent the radiant tube from carburizing and becoming brittle, but due to the high calorific value of the gas, the combustion atmosphere in the radiant tube will easily form a reducing atmosphere. Radiant tubes work in a carburized environment. The radiant tube is easy to become brittle and damaged; at the same time, the high calorific value of the gas will cause insufficient combustion of the gas, making the gas easy to burn in the exhaust pipe of the radiant tube, resulting in easy damage to the exhaust pipe
[0004] At present, the method of detecting whether the W-type radiant tube is leaking is carried out during the annual overhaul process. The maintenance personnel enter the annealing furnace and rely on manual observation to check the state of the radiant tube. This method has a fixed time, a long cycle, and cannot accurately Observe every point of the radiant tube
Since the detection of the W-type radiant tube is not timely and accurate enough, it is not conducive to the maintenance of the atmosphere in the furnace, and affects the effect of the radiant tube heating the strip steel. It is very necessary to improve

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Take the following steps:

[0027] Close to detect the status of the air solenoid valve and gas solenoid valve at the front of the burner;

[0028] Check that the upper heat exchanger flange and the lower burner flange of the W-type radiant tube are sealed and intact;

[0029] In order to further improve the accuracy of the detection data, it is required that the frontmost air and gas manual ball valves connected to the radiant tube burner must be closed to prevent the mixing of outside gas;

[0030] Use a portable gas analyzer, and pass the probe of the gas analyzer into the gas detection hole of the exhaust gas discharge pipe at the upper end of the burner;

[0031] The analyzer probe penetrates 14cm into the exhaust gas pipe, and the gap between the analyzer probe and the detection tube is sealed with a gasket;

[0032] The annealing furnace is in normal production state, the positive pressure in the furnace is 15DAPA, and the exhaust gas pipeline in the detection ...

Embodiment 2

[0036] Take the following steps:

[0037] Close to detect the status of the air solenoid valve and gas solenoid valve at the front of the burner;

[0038] Check that the upper heat exchanger flange and the lower burner flange of the W-type radiant tube are sealed and intact;

[0039] In order to further improve the accuracy of the detection data, it is required that the frontmost air and gas manual ball valves connected to the radiant tube burner must be closed to prevent the mixing of outside gas;

[0040] Use a portable gas analyzer, and pass the probe of the gas analyzer into the gas detection hole of the exhaust gas discharge pipe at the upper end of the burner;

[0041] The analyzer probe penetrates 12cm into the exhaust gas pipe, and the gap between the analyzer probe and the detection tube is sealed with a gasket;

[0042] The annealing furnace is in normal production state, the positive pressure in the furnace is 17DAPA, and the exhaust gas pipeline in the detection ...

Embodiment 3

[0046] Take the following steps to proceed:

[0047] Close to detect the status of the air solenoid valve and gas solenoid valve at the front of the burner;

[0048] Check that the upper heat exchanger flange and the lower burner flange of the W-type radiant tube are sealed and intact;

[0049] In order to further improve the accuracy of the detection data, it is required that the frontmost air and gas manual ball valves connected to the radiant tube burner must be closed to prevent the mixing of outside gas;

[0050] Use a portable gas analyzer, and pass the probe of the gas analyzer into the gas detection hole of the exhaust gas discharge pipe at the upper end of the burner;

[0051] The analyzer probe penetrates 15cm into the exhaust gas pipe, and the gap between the analyzer probe and the detection tube is sealed with a gasket;

[0052] The annealing furnace is in normal production state, the positive pressure in the furnace is 15DAPA, and the exhaust gas pipeline in the...

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PUM

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Abstract

The invention discloses an online detection method for the leakage of a W-shaped radiant tube of an annealing furnace and belongs to the technical field of annealing furnace equipment detection methods, and the method is used for detecting whether a W-shaped radiant tube of a cold-rolled galvanized vertical annealing furnace leaks or not. According to the technical scheme, the leakage detection isconducted on the W-shaped radiant tube through an online isolation detection method, according to the detection method, when a burner is in a closed state, for a normal radiant tube, a gas analyzer displays that O is larger than or equal to 20.9% and smaller than or equal to 21%, CO is equal to 0 ppm, and draft is larger than or equal to 8 mbar and smaller than or equal to 15 mbar. If the burneris in a closed state, the gas analyzer displays that a detection result that O is less than or equal to 20.9%, the radiant tube is damaged, and the change of a numerical value reflects the leakage degree of the radiant tube. The method is simple and convenient to operate, the production stop is not needed, radiant tubes can be detected one by one, the detection result is accurate, the atmosphere change in the furnace caused by the leakage of the radiant tubes is fundamentally eradicated, and the product quality is guaranteed.

Description

technical field [0001] The invention relates to a method for online detection of whether a W-shaped radiant tube of a cold-rolled galvanized vertical annealing furnace leaks, and belongs to the technical field of detection methods for annealing furnace equipment. Background technique [0002] The W-type radiant tube is mainly used in the continuous hot-dip galvanizing production line. The heating principle is that the burner is ignited in the radiant tube, and the flame of the burner burns in the tube to heat the radiant tube. The temperature of the radiant tube is used to heat the strip steel in the furnace to ensure The heating of the strip steel is uniform, and the appearance of the radiant tube is W-shaped, which can increase the effective heating area of ​​the radiant tube, which is beneficial to the uniform heating of the strip steel. [0003] The W-type radiant tube will be cracked and damaged during use. On the one hand, the reason for the crack is the direct welding...

Claims

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Application Information

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IPC IPC(8): G01N33/00G01M3/04
CPCG01M3/04G01N33/0063
Inventor 宗永超董学军江大伟王利锋吕素娟张选峰李晓东王琦王晨阳
Owner TANGSHAN IRON & STEEL GROUP
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