Online leakage detection method and device thereof for heat treatment furnace radiant tube

Abstract

The invention discloses an online quick leakage detection method for a heat treatment furnace radiant tube. The method comprises that the heat treatment furnace radiant tube is closed; gas flow at positions of any connectors of the heat treatment furnace radiant tube is detected; and leakage points exist on the heat treatment furnace radiant tube if the gas flow is more than zero, and the heat treatment furnace radiant tube is normal and no leakage exists if the gas flow is zero. The device of the method comprises a gas flow meter and a vacuum sampling pump, wherein a gas inlet of the gas flow meter is connected with any connector on the heat treatment furnace radiant tube, which is communicated with the external, and an exhaust port of the gas flow meter is connected with a gas inlet end of the vacuum sampling pump through a gas suction pipe. By the aid of the method, the accuracy and the reliability of detection are improved, the leakage detection can be conducted on a non-oxidation furnace radiant tube in real time accurately, reliably, conveniently and rapidly in the normal production, the operation is simple, the labor intensity is low, the cost is low and the method and the device are suitable to popularization and application.

Description

technical field [0001] The invention relates to a heat treatment furnace radiant tube leak detection technology, in particular to an on-line leak detection method and device for a heat treatment furnace radiant tube. technical background [0002] The sealing performance of the radiant tube non-oxidation heat treatment furnace is intact, no or very little scale is produced in the furnace, and excellent surface quality can be obtained under the premise of ensuring various properties of the steel plate. This kind of heat treatment furnace is favored by various steel mills because it can meet various heat treatment requirements in the steel market. If the sealing performance of the furnace body is not good or the radiant tube is burned through, causing combustion air or unburned gas to leak into the heat treatment furnace, an oxidizing atmosphere will be generated in the heat treatment furnace, which will not only cause oxide scale to form on the surface of the steel plate, but ...

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Problems solved by technology

The disadvantage of this method is that the furnace needs to be shut down and the furnace temperature drops to room temperature before it can be implemented, and it cannot be carried out online during the production process, and the shutdown of the continuous production operation furnace means a reduction in production, so it is necessary to ensure the number of furnace shutdowns throughout the year and the shutdown time is limited, so it is not possible to check for leaks in the radiant tube at any time

The disadvantages of this method are: it is necessary to make gaskets and explosion-proof discs, it is necessary to dismantle and block the waste gas pipe and air pipe of the radiant tube burner, and it needs a nitrogen gas source and corresponding air supply pipelines, which requires high implementation cost and heavy workload. long working hours

At the same time, this method also has the disadvantage of large detection error: because the radiant tube is in a high-temperature environment in the furnace, the temperature of the gas in the radiant tube will change with the furnace temperature, and the pressure of the gas enclosed in the tube will also change accordingly. There is a large error in the method of judging whether there is a leak in the radiant tube by using the pressure

[0006] The existing technology still does not have an effective method for online leak testing for a large number of radiant tubes, especially the simultaneous detection during normal production is a difficult problem

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