Online leakage detection method and device for non-oxidation furnace radiant tube containing shielding hydrogen gas

Abstract

The invention discloses an online leakage detection method for non-oxidation furnace radiant tube containing shielding hydrogen gas. The online leakage detection method includes steps of 1), emptying gas in a non-oxidation furnace radiant tube and then closing the non-oxidation furnace radiant tube; 2), opening any one of joints of closed space and leading sampled gas in the closed space to be communicated with a hydrogen analyzer through the joint; 3), analyzing the sampled gas, determining that a leak point of the non-oxidation furnace radiant tube exists if the sampled gas contains hydrogen gas, and determining that no leak point of the non-oxidation furnace radiant tube exists if content of hydrogen gas in the sampled gas is zero. An online leakage detection device comprises a hydrogen analyzer, a gas inlet of the hydrogen analyzer is connected with one end of a gas sampling tube, the other end of the gas sampling tube is used for being connected with any joint, communicated with the outside, on the non-oxidation furnace radiant tube, and an exhaust outlet of the hydrogen analyzer is connected with an exhaust tube. By the online leakage detection method, online quick leakage-detection to the non-oxidation furnace radiant tube can be realized accurately, reliably, conveniently and quickly.

Description

technical field [0001] The invention relates to a non-oxidation heat treatment furnace radiant tube leak detection technology with nitrogen-hydrogen (or all-hydrogen) protective gas, in particular to an online leak detection method and device for a non-oxidative furnace radiant tube with hydrogen protective gas. technical background [0002] The sealing of the radiant tube non-oxidizing furnace is intact, and no or very little scale is produced in the furnace. On the premise of ensuring the performance of the steel plate, excellent surface quality can be obtained. This non-oxidizing 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 non-oxidizing furnace, an oxidizing atmosphere will be generated in the non-oxidizing furnace, which will not only cause oxide...

AI Technical Summary

Problems solved by technology

The defect of this method is: it needs to stop the furnace and wait for the furnace temperature to drop to room temperature before it can be implemented, and it cannot be carried out on-line during the production process, and the continuous production furnace has a limited number of shutdowns and shutdown time throughout the year. cut production

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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