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Method for detecting leak point of closed annealing furnace

A detection method and annealing furnace technology, which are applied in the direction of detecting the appearance of fluid at the leak point, using liquid/vacuum degree for liquid tightness measurement, etc. The problems such as the inability to meet the requirements of airtightness can achieve the effect of ensuring air tightness, improving the quality of the strip, and solving the problems for a long time.

Inactive Publication Date: 2018-11-30
ANGANG STEEL CO LTD
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AI Technical Summary

Problems solved by technology

Due to the large size of the annealing furnace, it takes a long time to detect leaks, and the leak point is not thoroughly searched. Usually, the airtightness of the annealing furnace does not meet the requirements, which in turn affects the quality of the steel plate.

Method used

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Examples

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Comparison scheme
Effect test

Embodiment

[0017] A leak detection method of a closed annealing furnace, specifically comprising the following steps:

[0018] Step 1: Purging the inside of the annealing furnace with nitrogen as a medium, the amount of nitrogen used is more than 3 to 6 times the volume of the annealing furnace.

[0019] Step 2: Detect the volume content of oxygen in the furnace. When the volume content of oxygen is lower than 0.5%, close the sealing roller of the annealing furnace and close the discharge port of the annealing furnace.

[0020] Step 3: Continue to feed nitrogen gas into the furnace to keep the pressure in the annealing furnace at 200-300 Pa.

[0021] Step 4, feeding ammonia into the furnace to keep the ammonia concentration at 2% to 6%. Use the multiplication method to calculate the amount of ammonia gas introduced, place the liquid ammonia bottle on the weighing device, measure the weight reduction of the liquid ammonia bottle through the weighing device, calculate the amount of ammoni...

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PUM

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Abstract

The invention relates to the field of airtightness detection of closed annealing furnaces, and particularly relates to a method for detecting a leak point of a closed annealing furnace. Nitrogen is introduced into the annealing furnace, ammonia gas explosion is prevented by a double scheme of an isolation method and controlling the concentration, and the leak point is detected by the principle that an ammonia gas encounters a volatile acid to generate a chemical reaction to produce white smoke. According to the method provided by the invention, the airtightness of the annealing furnace is detected by using the ammonia gas, the leak point of the annealing furnace can be found accurately, quickly and intuitively, the airtightness of the annealing furnace is ensured, the problems of long time consumption and difficult troubleshooting of the leak point in the leak detection via the air pressure are solved, the smooth production is ensured, and the quality of strip steel is improved.

Description

technical field [0001] The invention relates to the field of air tightness detection of a closed annealing furnace, in particular to a method for detecting leaks in a closed annealing furnace. Background technique [0002] The airtight annealing furnace, especially the vertical continuous annealing furnace for cold rolling, is bulky. In order to ensure the bright annealing of the strip surface during production, a mixed gas of nitrogen and hydrogen needs to be introduced into the annealing furnace. The airtightness of the annealing furnace has a great impact on the quality of the strip steel. Improving the airtightness can greatly improve the quality of the strip steel. In addition, the furnace contains hydrogen, and poor airtightness can easily cause safety accidents. Therefore, the annealing furnace needs High air tightness. [0003] At present, the commonly used method for detecting leaks in annealing furnaces is: pressurize with air, and use soapy water to find leaks. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M3/04
Inventor 白世洪张国强何天庆姜大鹏王朋吴华良宗叙刘军友
Owner ANGANG STEEL CO LTD
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