CN111337195A - Water injection leakage detection method for vacuum system of air cooling condenser in thermal power plant - Google Patents
Water injection leakage detection method for vacuum system of air cooling condenser in thermal power plant Download PDFInfo
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- CN111337195A CN111337195A CN202010228574.XA CN202010228574A CN111337195A CN 111337195 A CN111337195 A CN 111337195A CN 202010228574 A CN202010228574 A CN 202010228574A CN 111337195 A CN111337195 A CN 111337195A
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
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Abstract
The invention relates to a water injection leakage detection method for a vacuum system of an air cooling condenser of a thermal power plant, which specifically comprises the following steps: 1) after the air-cooled condenser reaches the maintenance condition, closing each row of condensed water backwater isolation doors of the air-cooled condenser; 2) conveying condensed water in a condensed water system of a unit to all equipment of a vacuum system of the air-cooling condenser in sequence through newly-added water injection pipes and air extraction pipelines of all rows, so that a heat exchange pipe bundle, a condensed water header and a condensed water return pipe are filled with water, and the water level is controlled to be immersed in a welded junction on the upper edge of a groove at the lower part of a top steam distribution pipe; 3) and after the water level reaches the required height, searching water leakage points of the air cooling condenser filled with water, wherein each water leakage point is a leakage point of a vacuum system. The invention has the advantages that: the leak detection method is simple to operate, short in leak detection time, high in leak detection efficiency and visual in leak detection effect, can easily search for leak points of external heat-insulating equipment, and has a good popularization prospect in the field.
Description
Technical Field
The invention relates to the technical field of leakage detection of vacuum systems of air-cooled condensers in power plants, in particular to a water injection leakage detection method of a vacuum system of an air-cooled condenser in a thermal power plant.
Background
At present, methods adopted for leak detection of an air-cooled condenser vacuum system of a thermal power plant include an ultrasonic leak detection method, a positive pressure leak detection method, a weak signal leak detection method, a helium mass spectrum leak detection method and the like, and the defects of long time consumption, low efficiency and incapability of searching for leak points existing in equipment with external heat insulation are overcome.
Disclosure of Invention
The invention aims to provide a water injection leakage detection method for a vacuum system of an air cooling condenser of a thermal power plant, which aims to solve the problems in the background technology.
In order to solve the technical problems, the technical scheme provided by the invention is as follows: a water injection leakage detection method for a vacuum system of an air cooling condenser of a thermal power plant is characterized in that water is injected into the vacuum system, and the leakage point position of the vacuum system is detected by using the leakage condition of water, and the method specifically comprises the following steps:
1) after the air-cooled condenser reaches the maintenance condition, closing each row of condensed water backwater isolation doors of the air-cooled condenser;
2) conveying condensed water in a condensed water system of a unit to all equipment of a vacuum system of the air-cooling condenser in sequence through newly-added water injection pipes and air extraction pipelines of all rows, so that a heat exchange pipe bundle, a condensed water header and a condensed water return pipe are filled with water, and the water level is controlled to be immersed in a welded junction on the upper edge of a groove at the lower part of a top steam distribution pipe;
3) and after the water level reaches the required height, searching water leakage points of the air cooling condenser filled with water, wherein each water leakage point is a leakage point of a vacuum system.
Preferably, the water injection work of the air-cooled condenser is performed through an air pumping pipeline, a condensed water return pipe or a newly added water injection pipe.
The invention has the advantages that: the leak detection method is simple to operate, short in leak detection time, high in leak detection efficiency and visual in leak detection effect, can easily search for leak points of external heat-insulating equipment, and has a good popularization prospect in the field.
Drawings
Fig. 1 is a schematic structural diagram of the invention.
As shown in the figure: 1. steam distribution pipe, 2, air extraction pipeline, 3, heat exchange tube bundle, 4, condensate header, 5, newly-added water injection pipe, 6, condensate return pipe.
Detailed Description
The invention is illustrated below by means of specific examples, without being restricted thereto.
Example 1
A water injection leakage detection method for a vacuum system of an air cooling condenser of a thermal power plant is characterized in that water is injected into the vacuum system, and the leakage point position of the vacuum system is detected by using the leakage condition of water, and the method specifically comprises the following steps:
1) after the air-cooled condenser reaches the maintenance condition, closing each row of condensed water backwater isolation doors of the air-cooled condenser;
2) the condensed water in the condensed water system of the unit is sequentially conveyed to all equipment of the vacuum system of the air-cooling condenser through a newly-added water injection pipe 5 and each row of air pumping pipelines 2, so that the heat exchange pipe bundle 3, the condensed water header 4 and the condensed water return pipe 6 are filled with water, and the water level is controlled to be immersed in a welded junction on the upper edge of a groove at the lower part of the top steam distribution pipe 1;
3) and after the water level reaches the required height, searching water leakage points of the air cooling condenser filled with water, wherein each water leakage point is a leakage point of a vacuum system.
And the water injection work of the air cooling condenser injects water through the air pumping pipeline 2.
Example 2
A water injection leakage detection method for a vacuum system of an air cooling condenser of a thermal power plant is characterized in that water is injected into the vacuum system, and the leakage point position of the vacuum system is detected by using the leakage condition of water, and the method specifically comprises the following steps:
1) after the air-cooled condenser reaches the maintenance condition, closing each row of condensed water backwater isolation doors of the air-cooled condenser;
2) the condensed water in the condensed water system of the unit is sequentially conveyed to all equipment of the vacuum system of the air-cooling condenser through a newly-added water injection pipe 5 and each row of air pumping pipelines 2, so that the heat exchange pipe bundle 3, the condensed water header 4 and the condensed water return pipe 6 are filled with water, and the water level is controlled to be immersed in a welded junction on the upper edge of a groove at the lower part of the top steam distribution pipe 1;
3) and after the water level reaches the required height, searching water leakage points of the air cooling condenser filled with water, wherein each water leakage point is a leakage point of a vacuum system.
And water is injected into the air-cooled condenser through a condensed water return pipe 6.
Example 3
A water injection leakage detection method for a vacuum system of an air cooling condenser of a thermal power plant is characterized in that water is injected into the vacuum system, and the leakage point position of the vacuum system is detected by using the leakage condition of water, and the method specifically comprises the following steps:
1) after the air-cooled condenser reaches the maintenance condition, closing each row of condensed water backwater isolation doors of the air-cooled condenser;
2) the condensed water in the condensed water system of the unit is sequentially conveyed to all equipment of the vacuum system of the air-cooling condenser through a newly-added water injection pipe 5 and each row of air pumping pipelines 2, so that the heat exchange pipe bundle 3, the condensed water header 4 and the condensed water return pipe 6 are filled with water, and the water level is controlled to be immersed in a welded junction on the upper edge of a groove at the lower part of the top steam distribution pipe 1;
3) and after the water level reaches the required height, searching water leakage points of the air cooling condenser filled with water, wherein each water leakage point is a leakage point of a vacuum system.
And water is injected into the air-cooled condenser through a newly-added water injection pipe 5.
In the specific use of the invention, the elevation of an air-cooled condenser platform of a 660MW unit is 50 meters, the plane size is 97.5m × 75.25.25 m, a reinforced concrete pipe column and steel truss structure system is adopted, 16 reinforced concrete pipe columns with the diameter of 4.5 meters and the height of 43.18 meters adopt an independent foundation to support the weight of all the air-cooled condensers, the air-cooled condensers of each unit are divided into 8 rows, each row of A-shaped structures and 6 heat exchange units, each row of the air-cooled condensers comprise herringbone bilateral heat exchange pipe bundles 3, a top steam distribution pipe 1, a bottom condensed water collection box 4, a condensed water return pipe 6, a top air suction pipe of a 2/4 unit and other main equipment, condensed water or desalted water is injected into the air-cooled condenser heat exchange pipe bundles 3, the condensed water collection box 4 and the condensed water return pipe 6 through a newly added water injection pipe 55 from an air suction pipe bundle 2, the condensed water return pipe 6 is supported by the same column foot as the adjacent rows of supporting points, the leakage detection work of the air-cooled condenser pipe bundles can be carried out each row, the water injection work can be carried out in sequence after each row is detected, the water injection work can also be carried out, the water injection work.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (2)
1. A water injection leakage checking method for a vacuum system of an air cooling condenser of a thermal power plant is characterized in that water is injected into the vacuum system, and the leakage position of the vacuum system is checked by using the leakage condition of water, and the method specifically comprises the following steps:
1) after the air-cooled condenser reaches the maintenance condition, closing each row of condensed water backwater isolation doors of the air-cooled condenser;
2) conveying condensed water in a condensed water system of a unit to all equipment of a vacuum system of the air-cooling condenser in sequence through newly-added water injection pipes and air extraction pipelines of all rows, so that a heat exchange pipe bundle, a condensed water header and a condensed water return pipe are filled with water, and the water level is controlled to be immersed in a welded junction on the upper edge of a groove at the lower part of a top steam distribution pipe;
3) and after the water level reaches the required height, searching water leakage points of the air cooling condenser filled with water, wherein each water leakage point is a leakage point of a vacuum system.
2. The method for detecting the water injection leakage of the vacuum system of the air-cooled condenser of the thermal power plant according to claim 1, which is characterized in that: and the water injection work of the air-cooled condenser injects water through an air pumping pipeline, a condensed water return pipe or a newly-added water injection pipe.
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| CN202010228574.XA CN111337195A (en) | 2020-03-27 | 2020-03-27 | Water injection leakage detection method for vacuum system of air cooling condenser in thermal power plant |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113532752A (en) * | 2021-05-27 | 2021-10-22 | 华能苏州热电有限责任公司 | Special leakage detection device for steam turbine pipeline convenient to use |
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- 2020-03-27 CN CN202010228574.XA patent/CN111337195A/en active Pending
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| US20050053481A1 (en) * | 2003-09-09 | 2005-03-10 | Rietzel James G. | Method for differentially pumping endblock seal cavity |
| CN102252808A (en) * | 2011-04-26 | 2011-11-23 | 山东电力研究院 | Online detecting method and device for air leakage quantity of vacuum system of turbo generator unit |
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Application publication date: 20200626 |