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Leakage detecting method of hydrogen system for coal-fired power generator

A technology of thermal power generators and hydrogen systems, applied in the direction of liquid tightness measurement using liquid/vacuum degree, etc., which can solve the problems of leak detection personnel and equipment safety hazards, heavy workload, and low efficiency

Inactive Publication Date: 2012-07-04
NINGXIA ELECTRIC POWER RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of picking up leaks by applying soap bubbles has been gradually eliminated due to the heavy workload and low efficiency; when using the leak-picking method of a hydrogen gas detector for detection, if there is hydrogen leakage in the hydrogen system of the generator, flammable and flammable gas will form around the equipment. Explosive mixed gas will pose a safety hazard to leak detection personnel and equipment during the leak detection process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] 1) Gas replacement: First, use carbon dioxide to push out the hydrogen in the hydrogen system of the generator to be tested. If it is a new device, this step can be omitted;

[0015] 2) Vacuuming: vacuumize the hydrogen system of the generator after the above-mentioned gas replacement, and the vacuum degree is 0.02Mpa;

[0016] 3) Filling with sulfur hexafluoride gas: after the vacuum reaches the requirement, fill the hydrogen system of the generator with sulfur hexafluoride gas, and when the pressure in the hydrogen system of the generator reaches 0.01Mpa, then fill it with dry air to a level higher than that of the generator 10% of the rated hydrogen pressure of the machine hydrogen system;

[0017] 4) Leak detection: use Q200 sulfur hexafluoride gas leak detector generator hydrogen system for leak detection, and mark the leak point;

[0018] 5) Pressure relief: After the leak detection is completed, the mixed gas of sulfur hexafluoride and air in the hydrogen system...

Embodiment 2

[0020] 1) Gas replacement: First, use carbon dioxide to push out the hydrogen in the hydrogen system of the generator to be tested. If it is a new equipment, this step can be omitted;

[0021] 2) Vacuuming: vacuumize the hydrogen system of the generator after the above-mentioned gas replacement, and the vacuum degree is 0.03Mpa;

[0022] 3) Filling with sulfur hexafluoride gas: after the vacuum reaches the requirement, fill the hydrogen system of the generator with sulfur hexafluoride gas, and when the pressure in the hydrogen system of the generator reaches 0.01Mpa, then fill it with dry air to a level higher than that of the generator 10% of the rated hydrogen pressure of the machine hydrogen system;

[0023] 4) Leak detection: use Q200 sulfur hexafluoride gas leak detector generator hydrogen system for leak detection, and mark the leak point;

[0024] 5) Pressure relief: After the leak detection is completed, the mixed gas of sulfur hexafluoride and air in the hydrogen sys...

Embodiment 3

[0026] 1) Gas replacement: First, use carbon dioxide to push out the hydrogen in the hydrogen system of the generator to be tested. If it is a new device, this step can be omitted;

[0027] 2) Vacuuming: vacuumize the hydrogen system of the generator after the above-mentioned gas replacement, and the vacuum degree is 0.04Mpa;

[0028] 3) Filling with sulfur hexafluoride gas: after the vacuum reaches the requirement, fill the hydrogen system of the generator with sulfur hexafluoride gas, and when the pressure in the hydrogen system of the generator reaches 0.01Mpa, then fill it with dry air to a level higher than that of the generator 10% of the rated hydrogen pressure of the machine hydrogen system;

[0029] 4) Leak detection: use Q200 sulfur hexafluoride gas leak detector generator hydrogen system for leak detection, and mark the leak point;

[0030] 5) Pressure relief: After the leak detection is completed, the mixed gas of sulfur hexafluoride and air in the hydrogen system...

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Abstract

The invention relates to a detecting method of a pressure container, in particular to a leakage detecting method of a hydrogen system for a coal-fired power generator. The leakage detecting method comprises the steps of replacing gas; vacuumizing; filling sulfur hexafluoride gas; detecting leakage of the hydrogen system for the generator by a sulfur hexafluoride gas leakage detector and marking the leakage points; and decompressing. The leakage detecting method of the hydrogen system for the coal-fired power generator is combined with the sulfur hexafluoride gas leakage detector to detect the leakage of the hydrogen system for the generator by means of the characteristics of sulfur hexafluoride gas, in particular the characteristic of inertia of the sulfur hexafluoride gas and density of the sulfur hexafluoride gas that is greater than the density of air. Compared with the prior art, the method of the invention is good in safety and has high leakage detection precision, and the sulfur hexafluoride gas after leakage detection can be recycled, thereby reducing the cost of leakage detection.

Description

technical field [0001] The invention relates to a leak detection method for a pressure vessel, in particular to a leak detection method for a hydrogen system of a thermal power generator. Background technique [0002] In recent years, as the capacity level of thermal power units has gradually increased, the rated hydrogen pressure in the generator has also increased, so the pressure resistance requirements for the hydrogen system of the generator have also increased. When the hydrogen system of the generator leaks, the hydrogen pressure of the hydrogen system of the generator will be insufficient, which will greatly weaken the hydrogen cooling effect and cause great hidden dangers to the safe operation of the equipment. Therefore, the hydrogen system of the generator needs to be regularly checked for leakage. At present, the conventional generator hydrogen system leak detection methods mainly include the soap bubble detection method and the hydrogen detector leakage detecti...

Claims

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Application Information

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IPC IPC(8): G01M3/02
Inventor 王一波吴杨孔胜杰袁从明宋春林马锐马国柱陈晖
Owner NINGXIA ELECTRIC POWER RES INST
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