CN115219108A - Leakage detection device for generator hydrogen cooler and test method - Google Patents
Leakage detection device for generator hydrogen cooler and test method Download PDFInfo
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- CN115219108A CN115219108A CN202210833763.9A CN202210833763A CN115219108A CN 115219108 A CN115219108 A CN 115219108A CN 202210833763 A CN202210833763 A CN 202210833763A CN 115219108 A CN115219108 A CN 115219108A
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01M3/06—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by observing bubbles in a liquid pool
- G01M3/08—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by observing bubbles in a liquid pool for pipes, cables or tubes; for pipe joints or seals; for valves; for welds
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Abstract
The invention relates to a leak detection device and a test method for a hydrogen cooler of a generator, which comprises a pressure-bearing box body for placing the hydrogen cooler, a pressure monitoring meter and an air supply assembly, wherein the pressure monitoring meter and the air supply assembly are communicated with one side of the pressure-bearing box body; the upper end flange of the hydrogen cooler is hermetically connected with the top flange of the pressure-bearing box body, and the bottom of the hydrogen cooler is hermetically arranged through a rear side water chamber cover plate; the upper end flange of the hydrogen cooler corresponds to a hole of the top flange of the pressure-bearing box body, the box cover of the pressure-bearing box body is connected with the upper end flange in a sealing mode, and the box cover is provided with an observation window. The hydrogen cooler is placed in the pressure-bearing box body and is arranged in a sealing manner, the pressure-bearing box body is pressurized by compressed air, if leakage occurs, gas can permeate into the cooling pipe of the hydrogen cooler filled with water to generate bubbles, and then leakage points are judged according to the area and the number of the bubbles; through the design and the accounting of pressure bearing, the integral reliability and safety during the airtight test can be guaranteed by the thickness of the wall plate and the integral reinforcing structure.
Description
Technical Field
The invention relates to the technical field of maintenance of hydrogen coolers, in particular to a leakage detection device and a leakage detection test method for a hydrogen cooler of a generator.
Background
The hydrogen cooler is an important component of the hydrogen-cooled generator, and is widely applied to large and medium hydrogen (water, hydrogen and hydrogen-cooled) cooling generators due to strong heat exchange capacity and good cooling effect. The hydrogen cooler heat exchange pipeline material generally is B10 copper pipe or nonrust steel pipe, the tip adopts the tight mode of expanding to seal fixedly, inside cooling water can cause the erosion and corrosion to the inner wall when generating set operation, hydrogen greasy dirt etc. also can carry out the wearing and tearing to the outer wall and corrode, so the hydrogen cooler of operation ten years often takes place the inside or the problem that the mouth that expands of copper leaks, hydrogen can enter into the cooling water and leak the production site through the leak source, there is the risk of hydrogen explosion, hydrogen cooler leaks and need keep apart the operation or shut down when serious and handle and threaten unit safe operation.
The utility model discloses a current chinese utility model patent, the patent number is CN210322216U, the patent name is a generator hydrogen cooler condenser tube specialized tool that leaks hunting, this patent is connected hydraulic press 12 and water pressure gauge 13 through water injection pipe 11 on, form an independent pressure testing system, it suppresses to rise pressure to 0.5Mpa to leak hunting condenser tube 4 to lead to water, it leaks to confirm this condenser tube 4 to have the water droplet to spill below finding water pressure gauge 13 pressure reduction and the hydrogen cooler body 5, then die with the 4 both ends stifled of condenser tube that red copper end cap will leak, continue to leak hunting to other condenser tube 4 that do not examine. Because the cooling pipe in the hydrogen cooler is more, this kind of mode work load of checking for leaks is great, and the cycle is long, and the efficiency of checking for leaks is lower.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a leakage detection device and a leakage detection method for a generator hydrogen cooler.
In order to achieve the purpose, the invention is realized by the following technical scheme: a leakage detection device for a generator hydrogen cooler comprises a pressure-bearing box body for placing the hydrogen cooler, a pressure monitoring meter and an air supply assembly, wherein the pressure monitoring meter and the air supply assembly are communicated with one side of the pressure-bearing box body;
the upper end flange of the hydrogen cooler is hermetically connected with the top flange of the pressure-bearing box body, and the bottom of the hydrogen cooler is hermetically arranged through a rear side water chamber cover plate;
the upper end flange of the hydrogen cooler corresponds to the top flange of the pressure-bearing box in hole arrangement, the flange surface is polished, the flatness and the smoothness are guaranteed, the box cover of the pressure-bearing box is connected with the upper end flange in a sealing mode, and the box cover is provided with an observation window.
Dismantle the hydrogen cooler from the engine is inside earlier, the hydrogen cooler is installed in the pressure-bearing box, leave the space that is used for advancing compressed air between hydrogen cooler and the pressure-bearing box inner wall, after the cooling tube of hydrogen cooler added water, the cooling tube outside and the compressed air contact of hydrogen cooler, get into the cooling tube outside in the pressure-bearing box through pressurized air, if there is the leakage point, pressurized air produces the cooling mouth of pipe that the bubble upwards floated the correspondence from the leakage position, record cooling mouth of pipe position, realize looking for leaks. The pressure-bearing box body comprises a plurality of steel plates which are welded, after four sides of the pressure-bearing box body are welded, a bottom plate of the pressure-bearing box body is made of steel plates with the thickness delta =24mm, the pressure-bearing box body is welded at the bottom of the pressure-bearing box body fully through welding rods after grooves are formed, a gasket matched with the upper end flange is arranged between the upper end flange and the top flange in a padding mode, and the upper end flange and the top flange are fastened through screws.
Preferably, the air supply assembly comprises an air supply pipe and an air pipeline valve which are communicated, and an air compressor is communicated and arranged at one end, far away from the pressure-bearing box body, of the air supply pipe.
Preferably, a plurality of reinforcing ribs are distributed on the outer side of the pressure-bearing box body.
After the pressure-bearing box body is welded and formed, a reinforcing rib structure is welded on the surface of the pressure-bearing box body, in order to ensure the strength of the pressure-bearing box body after pressure bearing and avoid deformation, the reinforcing rib plate is made of a steel plate with the thickness of delta =24mm and the height of the steel plate is 100mm, the reinforcing rib plate is additionally welded by a 'well' structure, and the whole pressure-bearing box body is welded into an integral structure.
Preferably, the lifting lugs are symmetrically arranged on two sides of the upper end flange.
A test method for a leakage detection device of a generator hydrogen cooler comprises the following steps,
s1, a hydrogen cooler is placed in a pressure bearing box body, and an upper end flange is connected with a top flange in a sealing mode;
s2, injecting water into a cooling pipe at the top of the hydrogen cooler, wherein the water level is higher than that of a cooling pipe opening at the top, and standing the hydrogen cooler after the water injection is finished;
s3, connecting the interface of the air compressor and the air supply port inlet of the test pressure-bearing box body device firmly to ensure that the air compressor is sealed completely and is airtight;
s4, a sealing rubber pad is arranged between the box cover and the upper end flange, and the box cover is in sealing connection with the upper end flange;
s5, starting an air compressor, pressurizing the test pressure-bearing box body device, closing a gas pipeline valve when the pressure is increased to 0.4Mpa, maintaining the pressure of the pressure-bearing box body, and observing the condition of the pressure-bearing box body in the pressure maintaining process;
and S6, observing whether bubbles emerge from the pipe orifice of the hydrogen cooler submerged by water through an observation window of the box cover.
S7, in the testing stage, personnel perform comprehensive inspection once every 10 minutes, records are made, if a pipe orifice is found to have a leakage point, a mark is made after careful confirmation, and after the testing time is finished, the water and the materials are uniformly prevented from being disintegrated;
s8, in the test process, the hoisting machine is always stressed to protect the hydrogen cooler from bearing the load by the pressure-bearing box body, the maintenance platform can be erected according to the field environment, hoisting machines, lifting appliances and the like are qualified, and the safety of the operation field is ensured.
Compared with the prior art, the invention has the beneficial effects that: during maintenance, the hydrogen cooler is placed in the pressure-bearing box body and sealed, the pressure-bearing box body is pressurized by compressed air, if leakage occurs, gas can permeate into the cooling pipe of the hydrogen cooler filled with water to generate bubbles, and then leakage points are judged according to the area and the number of the bubbles;
through design and pressure-bearing accounting, the integral reliability and safety of the wall plate thickness and the integral reinforcing structure during the airtight test can be ensured, and the manufactured special pressure-bearing box body for checking the leakage of the hydrogen cooler pipeline can be used in combination with overhaul for a long time;
the method can be used for detecting leakage of the hydrogen cooler pipeline and the expansion port by a gas-combined water injection method, has high accuracy, can efficiently detect the leakage faults (including micro leakage) of the hydrogen cooler pipeline and the expansion port of the generator, is convenient to process and eliminate equipment defects, prolongs the service life of the hydrogen cooler, saves maintenance cost and eliminates major defects threatening the safe operation of the generator set.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a front cross-sectional structural view of the present invention;
FIG. 3 is an enlarged view of the structure at A in FIG. 2.
The reference numbers shown in the figures: 1. a pressure-bearing box body; 101. a top flange; 2. a hydrogen gas cooler; 201. an upper end flange; 202. a cooling tube; 3. a pressure monitoring meter; 4. a rear water chamber cover plate; 5. a box cover; 501. an observation window; 6. a gas supply pipe; 7. a gas line valve; 8. an air compressor; 9. reinforcing ribs; 10. lifting lugs; 11. and sealing the rubber gasket.
Detailed Description
The invention is further explained by combining a specific embodiment, and as shown in fig. 1-3, the leakage checking device for the hydrogen cooler of the generator comprises a pressure-bearing box body 1 for placing the hydrogen cooler 2, a pressure monitoring meter 3 and an air supply assembly, wherein the pressure-bearing box body is communicated with one side of the pressure-bearing box body 1;
the upper end flange 201 of hydrogen gas cooler 2 and the top flange 101 sealing connection of pressure-bearing box 1, 2 bottoms of hydrogen gas cooler are through the sealed setting of rear side water chamber apron 4, are provided with sealing rubber pad 11 between 2 bottoms of hydrogen gas cooler and the rear side water chamber apron 4, and rear side water chamber apron 4 and 2 bottoms of hydrogen gas cooler accessible welding or bolted connection etc. mode sealing connection guarantee that the sealing rubber pad 11 of each position hydrogen gas cooler 2 is all intact not to have the problem of leaking.
The upper end flange 201 of hydrogen cooler 2 corresponds the setting with the top flange 101's of pressure-bearing box 1 aperture, and upper end flange 201 adopts the Q235 steel sheet that panel thickness is delta =16mm, and upper end flange 201 bilateral symmetry is provided with lug 10, guarantees that lug 10 intensity satisfies the intensity that 2 bodies of hydrogen cooler lifted by crane safely, and it is qualified to detect a flaw to polish the 201 face of upper end flange, guarantee roughness and smooth finish.
The case lid 5 of pressure-bearing box 1 is used for with top flange 101 sealing connection, and case lid 5 is provided with explosion-proof observation window 501.
The 2 models of hydrogen cooler that this embodiment is suitable for are QFSN600-2 type turbo generator hydrogen cooler 2, and hydrogen cooler 2 is installed in pressure-bearing box 1, leaves the space that is used for admitting air between hydrogen cooler 2 and the 1 inner walls of pressure-bearing box, and through pressurized air entering hydrogen cooler 2's leakage position, pressurized air produces the cooling tube 202 mouth of pipe that the bubble upwards floated the correspondence from the leakage position, and the record cooling tube 202 mouth of pipe position realizes looking for the hourglass.
The pressure-bearing box body 1 comprises a plurality of steel plates and is formed by welding, the pressure-bearing box body 1 belongs to a pressure-bearing part (with the highest pressure of 0.75 MPa), the body is formed by combining and splicing Q235 steel plates with the plate thickness delta =16mm through calculation and design, after the four sides of the pressure-bearing box body 1 are welded, the bottom plate of the pressure-bearing box body 1 adopts the Q235 steel plates with the plate thickness delta =24mm, the bottom of the pressure-bearing box body 1 is fully welded by J507 welding rods after beveling, a gasket matched with the upper end flange 201 and the top flange 101 is arranged between the upper end flange 201 and the top flange 101 in a padding mode, and the upper end flange 201 and the top flange 101 are all fastened through screws.
The gas supply assembly comprises a gas supply pipe 6 and a gas pipeline valve 7 which are communicated, after the whole pressure-bearing box body 1 is welded, a pressure gauge pipe with the outer diameter phi =14mm and the outer diameter delta =24mm is welded at the proper position of the pressure-bearing box body 1, and the pressure monitoring gauge 3 with the installation range of 1MPa and qualified verification is installed. An air supply pipe 6 is communicated and installed on one side of the pressure-bearing box body 1 below the pressure monitoring meter 3, a gas pipeline valve 7 is installed in the middle of the air supply pipe 6, and an air compressor 8 is communicated and arranged at one end, far away from the pressure-bearing box body 1, of the air supply pipe 6.
After the pressure-bearing box body 1 is welded and formed, a reinforcing rib 9 structure is welded on the surface of the pressure-bearing box body 1, in order to ensure the strength of the pressure-bearing box body 1 after pressure bearing and avoid deformation, the reinforcing rib 9 plate is a steel plate with the plate thickness delta =24mm, the height is 100mm, the reinforcing rib 9 plate is welded and installed in a 'well' structure, and the whole pressure-bearing box body 1 is welded into an integral structure.
Performance testing of gas-tight pressure devices
1) After the test pressure-bearing box body 1 device is completely processed, metal flaw detection is carried out on the used welding line to be qualified;
2) The box cover 5 is matched with the top flange 101, and the box cover 5 and the top flange 101 are correspondingly drilled to ensure the machining precision and the flatness of a sealing surface;
3) The method comprises the following steps of processing a nitrile rubber sheet with the thickness of delta =5mm corresponding to the size of a flange, and punching a hole to form a top flange 101 and a sealing rubber pad 11 for a box cover 5;
4) Sealing the pressure-bearing box body 1 by using a sealing rubber gasket 11 and a box cover 5, and then connecting a small air compressor 8 to a pipe orifice of an air inlet meter;
5) Starting the air compressor 8 to carry out a pressure-bearing test on the pressure-bearing box body 1, wherein the pressure is 0.6MPa, no weld joint cracks within 2 hours, the box body deforms, and no leakage exists at the weld joint of the box body and the sealing rubber pad 11;
6) And after the withstand voltage test is qualified, the inside and the outside of the box body are integrally anticorrosive.
A test method for a leakage detection device of a generator hydrogen cooler comprises the following steps:
s1, vertically hoisting a lifting lug 10 of a hydrogen cooler 2 through a hoisting machine and placing the lifting lug in a pressure-bearing box body 1, wherein an upper end flange 201 of the hydrogen cooler 2 is hermetically connected with a top flange 101;
s2, injecting water into the cooling pipe at the top of the hydrogen cooler 2, wherein the water level is higher than the pipe orifice of the cooling pipe 202 at the top, and standing the hydrogen cooler 2 after the water injection is finished;
s3, firmly connecting the interface of the air compressor 8 with the air supply port inlet of the test pressure-bearing box body 1 device to ensure that the air is sealed completely and does not leak air;
s4, a sealing rubber pad 11 is arranged between the box cover 5 and the upper end flange 201, and the box cover 5 is connected with the upper end flange 201 in a sealing mode;
s5, starting an air compressor 8, pressurizing the device of the test pressure-bearing box body 1, closing a gas pipeline valve 7 when the pressure is increased to 0.4Mpa, maintaining the pressure of the pressure-bearing box body 1, and observing the condition of the pressure-bearing box body 1 in the pressure maintaining process;
s6, observing whether bubbles emerge from the pipe orifices of the cooling pipes 202 of the hydrogen cooler 2 submerged by water through the observation window 501 of the box cover 5;
s7, the testing time of the embodiment is 1 hour, personnel perform comprehensive inspection once every 10 minutes, make records, if a pipe orifice is found to have a leakage point, make a mark after carefully confirming, and after the testing time is finished, prevent water from disintegrating and uniformly process;
s8, in the test process, the hoisting machinery is guaranteed to be always stressed to protect the hydrogen cooler 2 from bearing by the pressure-bearing box body 1, the maintenance platform can be erected according to the field environment, hoisting machines, lifting appliances and the like are qualified, and the safety of the operation field is guaranteed.
It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention can be made by those skilled in the art after reading the teaching of the present invention, and these equivalents also fall within the scope defined by the present application.
Claims (5)
1. The utility model provides a be used for generator hydrogen cooler to look for device that leaks which characterized in that: the hydrogen cooler comprises a pressure-bearing box body (1) for placing the hydrogen cooler (2), a pressure monitoring meter (3) and a gas supply assembly, wherein the pressure-bearing box body (1) is communicated with one side of the pressure-bearing box body (1);
an upper end flange (201) of the hydrogen cooler (2) is hermetically connected with a top flange (101) of the pressure-bearing box body (1), and the bottom of the hydrogen cooler (2) is hermetically arranged through a rear side water chamber cover plate (4);
the box cover (5) of the pressure-bearing box body (1) is connected with the upper end flange (201) in a sealing mode, and the box cover (5) is provided with an observation window (501).
2. The hydrogen cooler leak detection device for the generator as claimed in claim 1, wherein: the air supply assembly comprises an air supply pipe (6) and an air pipeline valve (7) which are communicated with each other, and an air compressor (8) is arranged at one end, far away from the pressure-bearing box body (1), of the air supply pipe (6) in a communicated manner.
3. The leakage detection device for the hydrogen cooler of the generator as claimed in claim 1, wherein: a plurality of reinforcing ribs (9) are distributed on the outer side of the pressure-bearing box body (1).
4. The hydrogen cooler leak detection device for the generator as claimed in claim 1, wherein: lifting lugs (10) are symmetrically arranged on two sides of the upper end flange (201).
5. A test method for a generator hydrogen cooler leak detection device, comprising the generator hydrogen cooler leak detection device as claimed in any one of claims 1 to 4, characterized in that: comprises the following steps of (a) carrying out,
s1, the hydrogen cooler (2) is placed in a pressure-bearing box body (1), and an upper end flange (201) is connected with a top flange (101) in a sealing mode;
s2, injecting water into a cooling pipe (202) at the top of the hydrogen cooler (2), wherein the water level is higher than that of a cooling pipe opening at the top, and standing the hydrogen cooler (2) after the water injection;
s3, connecting the interface of the air compressor (8) and the air supply port inlet of the test pressure-bearing box body (1) device firmly to ensure that the air is sealed completely and does not leak air;
s4, a sealing rubber gasket (11) is arranged between the box cover (5) and the upper end flange (201), and the box cover (5) is connected with the upper end flange (201) in a sealing mode;
s5, starting the air compressor (8), pressurizing a device of the test pressure-bearing box body (1), closing a gas pipeline valve (7) when the pressure is increased to 0.4Mpa, maintaining the pressure of the pressure-bearing box body (1), and observing the condition of the pressure-bearing box body (1) in the pressure maintaining process;
s6, observing whether bubbles emerge from the pipe orifice of the hydrogen cooler (2) submerged by water through an observation window (501) of the box cover (5);
s7, in the testing stage, personnel perform comprehensive inspection once every 10 minutes, make records, if a pipe orifice has a leakage point, make marks after carefully confirming, after the testing time is finished, prevent water from disintegrating and processing in a unified way;
s8, in the test process, the hoisting machinery is guaranteed to be always stressed to protect the hydrogen cooler (2) from bearing by the pressure-bearing box body (1), the maintenance platform can be erected according to the field environment, hoisting machines, lifting appliances and the like are qualified, and the safety of the operation field is guaranteed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210833763.9A CN115219108A (en) | 2022-07-15 | 2022-07-15 | Leakage detection device for generator hydrogen cooler and test method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210833763.9A CN115219108A (en) | 2022-07-15 | 2022-07-15 | Leakage detection device for generator hydrogen cooler and test method |
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| CN115219108A true CN115219108A (en) | 2022-10-21 |
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| CN202210833763.9A Pending CN115219108A (en) | 2022-07-15 | 2022-07-15 | Leakage detection device for generator hydrogen cooler and test method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117949315A (en) * | 2024-03-26 | 2024-04-30 | 摩丁普信热能技术（江苏）有限公司 | Cooler static pressure intensity test equipment for new energy automobile |
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2022
- 2022-07-15 CN CN202210833763.9A patent/CN115219108A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117949315A (en) * | 2024-03-26 | 2024-04-30 | 摩丁普信热能技术（江苏）有限公司 | Cooler static pressure intensity test equipment for new energy automobile |
| CN117949315B (en) * | 2024-03-26 | 2024-05-28 | 摩丁普信热能技术（江苏）有限公司 | Cooler static pressure intensity test equipment for new energy automobile |
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