Method for detecting internal leakage of gas valve of industrial furnace online by utilizing furnace temperature change
A technology for industrial furnaces and internal leakage, which is used in measuring devices, fluid tightness testing, and machine/structural component testing.
Active Publication Date: 2014-10-29
BAOSHAN IRON & STEEL CO LTD
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But the invention is not suitable for online detection
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[0024] A method for on-line detection of leakage in industrial furnace gas valve by utilizing furnace temperature change of the present invention will be further described below with reference to the accompanying drawings and embodiments.
[0025] A method for on-line detection of leakage in industrial furnace gas valve by utilizing furnace temperature change of the present invention will be further described below with reference to the accompanying drawings and embodiments.
[0026] Firstly, the reasons for selecting the temperature as the indirect judgment quantity and the abnormal judgment rules are as follows: the normal flame will form an obvious long rod-shaped flame due to the injection and stirring of the combustion air, and cause the temperature near the thermocouple on the opposite furnace wall to rise; The amount of leakage in the gas is generally small. Different from the temperature rise caused by the normal jet flame, it only burns diffusely near the burner, and t...
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Provided is a method for detecting internal leakage of a gas valve of an industrial furnace online by utilizing furnace temperature change. The industrial furnace comprises a pressure regulating valve arranged on a blower fan header pipe and a plurality of burner nozzles, wherein each burner nozzle is provided with a gas valve, an air valve and a flame detector. The detection method comprises the following steps: 1) dividing the burner nozzles into a plurality of areas under detection; 2) collecting the temperature of the areas under detection; 3) carrying out A / D conversion on signals obtained from the areas under detection; 4) reading, calculating and displaying a changing curve of the temperature signals of the areas under detection; 5) comparing the temperature variation curve detected actually with the preset temperature curve, judging the areas under detection which have internal leakage phenomenon, and sending a leakage alarming signal; and 6) opening the air valve, and if detecting burner nozzle flame through the flame detector, sending an alarming signal. According to the method for detecting the internal leakage of the gas valve of the industrial furnace online by utilizing the furnace temperature change, online detection of the internal leakage of the gas valve can be realized, small-flow internal leakage can be found quickly, and loss is thus reduced.
Description
technical field [0001] The invention relates to the field of production process detection, in particular to a method for on-line detection of internal leakage of industrial furnace gas valves by utilizing furnace temperature changes. Background technique [0002] For the internal leakage detection of the valve, it is generally used after the equipment is deactivated or replaced, and after the pipeline is filled with nitrogen or other inert gas with a certain pressure, if the pressure is stable or the pressure drop is within the acceptable limit for a period of time, Then determine the acceptable offline mode. [0003] The invention with application number 201010614664.9 relates to a gas leak detection method, which includes the following steps: (1) opening the gas main circuit solenoid valve of the gas shock soot blowing system, closing the first solenoid valve of the detected gas branch circuit, and sending the gas to the gas (2) According to whether the leakage signal val...
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IPC IPC(8): G01M3/00
Inventor 李高鹏
Owner BAOSHAN IRON & STEEL CO LTD