CN118008874A - Nuclear power station main pump mechanical seal repairing and test verification method - Google Patents
Nuclear power station main pump mechanical seal repairing and test verification method Download PDFInfo
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- CN118008874A CN118008874A CN202211402055.6A CN202211402055A CN118008874A CN 118008874 A CN118008874 A CN 118008874A CN 202211402055 A CN202211402055 A CN 202211402055A CN 118008874 A CN118008874 A CN 118008874A
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- 238000012360 testing method Methods 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000012795 verification Methods 0.000 title abstract description 3
- 230000008439 repair process Effects 0.000 claims abstract description 13
- 230000002285 radioactive effect Effects 0.000 claims abstract description 7
- 238000007789 sealing Methods 0.000 claims description 239
- 230000003068 static effect Effects 0.000 claims description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 238000005498 polishing Methods 0.000 claims description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 9
- 229910002804 graphite Inorganic materials 0.000 claims description 9
- 239000010439 graphite Substances 0.000 claims description 9
- 230000003746 surface roughness Effects 0.000 claims description 9
- 230000007547 defect Effects 0.000 claims description 7
- 238000004140 cleaning Methods 0.000 claims description 6
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 238000003860 storage Methods 0.000 claims description 6
- 238000011179 visual inspection Methods 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 5
- 230000002159 abnormal effect Effects 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 230000006872 improvement Effects 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- 238000003384 imaging method Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 238000011056 performance test Methods 0.000 claims description 3
- 239000011347 resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 239000007779 soft material Substances 0.000 claims description 3
- 238000013461 design Methods 0.000 claims description 2
- 239000013049 sediment Substances 0.000 claims description 2
- 238000012423 maintenance Methods 0.000 abstract description 6
- 239000002901 radioactive waste Substances 0.000 abstract description 2
- 239000002826 coolant Substances 0.000 description 3
- 239000000446 fuel Substances 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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Abstract
The disclosure belongs to the technical field of nuclear power, and particularly relates to a nuclear power station main pump mechanical seal repairing and test verification method. The method for repairing the mechanical seal and verifying the test of the main pump of the nuclear power station can repair and verify the radioactive old mechanical seal of the existing main pump, the size parameter and the performance of the repaired mechanical seal reach the factory acceptance standard of a new spare part, and the repaired mechanical seal is applied to the field as the spare part, so that the maintenance cost is greatly reduced, the generation of radioactive waste is reduced, and the problem of shortage of the field spare part caused by long purchase period of the imported spare part is solved. The method can be applied to repair work of radioactive old mechanical seals of main pumps with different models in domestic nuclear power plants, the old seals are reused after repair, and spare part consumption and maintenance cost are reduced.
Description
Technical Field
The invention belongs to the technical field of nuclear power, and particularly relates to a method for repairing mechanical seal of a main pump of a nuclear power station and verifying test.
Background
The main pump is a key device of the nuclear power station, is the only high-speed rotating device in a nuclear power station reactor coolant system, and is used for driving high-temperature and high-pressure coolant to pass through the reactor core at a high flow rate, and transmitting heat generated in the reactor core to the steam generator, so that the fuel assembly in the reactor core can fully transfer heat, and the safety of the fuel assembly is ensured. If the main pump fails, automatic or manual shutdown is directly caused. The mechanical seal is one of key parts of the main pump and is used for limiting outward leakage of reactor coolant, and is also the part which is most easily damaged on the main pump, and leakage quantity is abnormal due to slight running deviation, even a reactor emergency shutdown event is caused, safety production of a power station is threatened, and huge economic loss is caused.
The nuclear power plant needs to periodically check and replace the mechanical seal of the main pump according to preventive maintenance projects, the related mechanical seals are all imported parts, the price is high, the purchase cost of a whole set of mechanical seals is up to millions of yuan, and therefore a process method for repairing and utilizing the old main pump seal is needed.
Disclosure of Invention
In order to overcome the problems in the related art, the method for repairing the mechanical seal of the main pump of the nuclear power station and verifying the mechanical seal is provided.
According to an aspect of the disclosed embodiments, there is provided a method for repairing a mechanical seal of a main pump of a nuclear power station and verifying a test, the method including:
Step 1: cleaning and checking before repairing: cleaning and checking a first-stage sealing device, a second-stage sealing device and a third-stage sealing device to be repaired, if the defects of the first-stage sealing device, the second-stage sealing device and the third-stage sealing device are obviously not provided with repairing conditions, directly performing scrapping treatment, and if the first-stage sealing device, the second-stage sealing device and the third-stage sealing device are provided with repairing conditions, turning to step 2, wherein the first-stage sealing device is a non-contact sealing device, and the second-stage sealing device and the third-stage sealing device are contact sealing devices;
Step 2: measuring the size data of the first-stage sealing device, the second-stage sealing device and the third-stage sealing device according to the size checking requirement in the technical index, wherein the size data comprises the sizes, form and position tolerances, surface roughness and the cone angle of the sealing surfaces of the first-stage sealing device, the second-stage sealing device and the third-stage sealing device;
Step 3: the sealing surfaces of the second-stage sealing device and the third-stage sealing device are ground, the sealing surfaces of the second-stage sealing device and the third-stage sealing device are ground by using resin copper disc grinding equipment in combination with special grinding agents, so that no attachments are generated on the surfaces of the sealing surfaces, the thickness of a coating or the height allowance of a graphite boss meets the acceptance requirement, the first-stage sealing device is in non-contact sealing, the surface is in cone angle design, and the grinding procedure is not needed;
step 4: polishing the surface, namely polishing the moving rings and the static rings of the second-stage sealing device and the third-stage sealing device and the moving rings and the static rings of the first-stage sealing device which are ground in the step 3, so that the surface roughness after polishing meets the acceptance requirement;
Step 5: measuring the repaired size, namely measuring the repaired size data of the sealing surfaces of the first-stage sealing device, the second-stage sealing device and the third-stage sealing device according to the size checking requirement in the technical indexes, wherein the size data comprises the size, the form and position tolerance, the surface roughness and the cone angle of the sealing surfaces, comparing the measured repaired size data with the size data before repair and the checking requirement by using a measuring instrument, and judging whether the repairing requirement is met;
step 6: the static pressure test is carried out, the assembled and repaired main pump is sealed and mounted on a test bench to carry out the static pressure test, the static pressure test is carried out firstly according to the operation rules, and whether the leakage amounts of the first-stage sealing device, the second-stage sealing device and the third-stage sealing device under different pressure platforms meet the acceptance criterion is verified;
Step 7: dynamic tests, which are carried out according to operation rules, and include leakage quantity and stability detection tests of a first-stage sealing device, a second-stage sealing device and a third-stage sealing device under different pressure platforms, sealing performance influence tests under different parameter changes and sealing performance tests under abnormal working conditions, and whether all test results meet acceptance requirements is confirmed;
step 8: and (3) sealing, disassembling and checking storage, namely disassembling the first-stage sealing device, the second-stage sealing device and the third-stage sealing device which are qualified in the test, checking appearance and visual inspection, checking appearance and size by using a laser interferometer again if necessary, sorting measurement and test data, and sealing and storing conditions after repairing are constant temperature and constant humidity environments, wherein the sealing and storing conditions are used for sealing and storing in factory building selection or improvement overhaul rooms.
In one possible implementation, step 1 further includes:
Step 1.1: the first-stage sealing device, the second-stage sealing device and the third-stage sealing device are decontaminated and cleaned, so that the radioactive dose is reduced;
Step 1.2: cleaning the surfaces of the first-stage sealing device, the second-stage sealing device and the third-stage sealing device, and removing surface sediments;
Step 1.3: and carrying out visual inspection on the first-stage sealing device, the second-stage sealing device and the third-stage sealing device to confirm that no obvious damage defect exists, and recording the serial numbers of the parts.
In one possible implementation, step 2 further includes: and measuring and three-dimensionally imaging conical surfaces of the movable ring and the stationary ring of the first-stage sealing device, and measuring planeness and roughness of the surfaces of the movable ring and the stationary ring of the first-stage sealing device, the second-stage sealing device and the third-stage sealing device.
In one possible implementation, the acceptance requirement at step 3 is: the height of the static ring graphite boss of the second sealing device is more than or equal to 1.65mm, and the height of the static ring graphite boss of the third sealing device is more than or equal to 1.5mm.
In one possible implementation, the acceptance requirement at step 4 is: the flatness of the sealing end surface of the movable ring is less than or equal to 0.0009mm, and the roughness value of the sealing end surface of the hard material sealing ring is less than or equal to 0.2 mu m; the flatness of the sealing end surface of the static ring is less than or equal to 0.0009mm, and the roughness value Ra of the sealing end surface of the sealing ring made of soft materials is less than or equal to 0.4 mu m.
In one possible implementation, the acceptance criteria in step 6 are: the leakage of the first-stage sealing device is 400-600 l/h, the leakage of the second-stage sealing device is less than 7l/h, and the leakage of the third-stage sealing device is 400-1200 cc/h.
In one possible implementation manner, the test bench in the step 6 is an integrated module, the rotating speed is adjustable, and the additional instrument panel can display test pressure, temperature and flow data on site and remotely transmit the data to the DCS control console, so that the full-range dynamic and static test of the three-level mechanical seal can be performed.
In one possible implementation, the acceptance requirement of step 7 is: the leakage amount of the first-stage sealing device is 400-600 l/h, after the sealing components of the second-stage sealing device and the third-stage sealing device are operated for 6 hours, water is injected into the second-stage sealing device and the third-stage sealing device, when the water temperature is 70 ℃ and the pressure drop is 1.55bar, the leakage amount of the second-stage sealing device is less than 7l/h, the leakage amount of the third-stage sealing device is 400-1200 cc/h, the water temperature change is not more than +/-1.5 ℃ within 20 minutes after water injection, and the leakage amount amplitude is less than 1.5% within 8 hours after water injection.
The beneficial effects of the present disclosure are: the method for repairing the mechanical seal and verifying the test of the main pump of the nuclear power station can repair and verify the radioactive old mechanical seal of the existing main pump, the size parameter and the performance of the repaired mechanical seal reach the factory acceptance standard of a new spare part, and the repaired mechanical seal is applied to the field as the spare part, so that the maintenance cost is greatly reduced, the generation of radioactive waste is reduced, and the problem of shortage of the field spare part caused by long purchase period of the imported spare part is solved. The method can be applied to repair work of radioactive old mechanical seals of main pumps with different models in domestic nuclear power plants, the old seals are reused after repair, and spare part consumption and maintenance cost are reduced.
Drawings
FIG. 1 is a flow chart illustrating a method for repairing a mechanical seal and verifying a test of a primary pump of a nuclear power plant, according to an exemplary embodiment.
Detailed Description
The invention will be described in further detail with reference to the accompanying drawings and specific examples.
FIG. 1 is a flow chart illustrating a method for repairing a mechanical seal and verifying a test of a primary pump of a nuclear power plant, according to an exemplary embodiment. As shown in fig. 1, the method for repairing the mechanical seal of the main pump of the nuclear power station and verifying the test can comprise the following steps:
in the present disclosure, the first stage seal is a non-contact seal, and the second and third stage seals are contact seals.
Step 1: pre-repair clean-up checks (see sequence a in fig. 1).
Step 1.1: for example, the first-stage sealing device, the second-stage sealing device and the third-stage sealing device to be repaired can be decontaminated and cleaned by using a decontaminating agent and non-fluffing white cloth, so that the radioactive dose is reduced.
Step 1.2: for example, the surfaces of the first-stage sealing device, the second-stage sealing device and the third-stage sealing device can be primarily cleaned by using scouring pads and non-fluffing white cloths, so as to remove surface deposits.
Step 1.3: visual inspection is carried out on the first-stage sealing device, the second-stage sealing device and the third-stage sealing device to confirm that no obvious damage such as cracks, scratches, air holes and the like exists, and the serial numbers of the parts are recorded. If the defects of the components are obviously not provided with repairing conditions, the scrapping treatment is directly carried out, if the defects of the first-stage sealing device, the second-stage sealing device and the third-stage sealing device are obviously not provided with repairing conditions, the scrapping treatment is directly carried out, and if the defects of the first-stage sealing device, the second-stage sealing device and the third-stage sealing device are provided with repairing conditions, the step 2 is carried out.
Step 2: pre-repair dimensional measurements (see sequence B in fig. 1).
Measuring data before repairing the sealing surface of each sealing device, including the size, the form and position tolerance, the surface roughness and the cone angle of the sealing surface of the first-stage sealing device according to the size checking requirement in the technical index; the measuring instrument comprises a conventional measuring tool (such as a vernier caliper, a depth gauge and the like) and a special measuring tool (such as an plat crystal, a laser interferometer and the like, wherein the precision of the laser interferometer is 1 micrometer), the conical surfaces of a movable ring and a static ring of the first-stage sealing device are measured, three-dimensional imaging processing is carried out, and the flatness and the roughness of the surfaces of the movable rings and the static rings of the first-stage sealing device, the second-stage sealing device and the third-stage sealing device are measured.
Step 3: sealing surface grinding (see sequence C in fig. 1). The second-stage sealing device and the third-stage sealing device are in contact type sealing, and the sealing surfaces of the second-stage sealing device and the third-stage sealing device are ground by using resin copper disc grinding equipment in combination with special grinding agents, so that no attachments, coating thickness or graphite boss height allowance on the surfaces of the sealing surfaces can meet acceptance requirements. Wherein the height of the second sealed static ring graphite boss is more than or equal to 1.65mm; the height of the static ring graphite boss of the third-stage sealing device is more than or equal to 1.5mm, the first-stage sealing device is in non-contact sealing, the surface of the first-stage sealing device is designed to be a cone angle, and a grinding procedure is not needed.
Step 4: surface polishing treatment (see sequence D in fig. 1). Polishing the polished movable ring and the polished stationary ring of the second-stage sealing device and the third-stage sealing device, and the polished movable ring and the polished stationary ring of the first-stage sealing device, wherein the minimum feeding of the polishing machine is 1 micrometer, and four shafts are linked, so that the functions of conical surface polishing and sundry removal are realized, and the surface roughness after polishing meets the acceptance requirement, wherein the flatness of the sealing end surface of the movable ring is less than or equal to 0.0009mm, and the roughness value Ra of the sealing end surface of the hard material sealing ring is less than or equal to 0.2 mu m; the flatness of the sealing end surface of the static ring is less than or equal to 0.0009mm, and the roughness value Ra of the sealing end surface of the sealing ring made of soft materials is less than or equal to 0.4 mu m.
Step 5: post-repair dimensional measurement (see sequence E in fig. 1).
And measuring the repaired data of the sealing surfaces of the sealing devices according to the size checking requirements in the technical indexes, wherein the repaired data comprises the size, the form and position tolerance, the surface roughness and the cone angle of the sealing surfaces, and comparing the measured repaired data with the data before repair and the checking requirements by using a measuring instrument.
Step 6: static pressure test (see sequence F in fig. 1).
The main pump after assembly and repair is sealed and installed on a test bench, the test bench is an integrated module, the rotating speed is adjustable, an additional instrument panel can display pressure, temperature and flow data on site and remotely transmit the data to a DCS control console, a full-range dynamic and static test of three-level mechanical seal can be carried out, the static test is carried out firstly according to an operation rule, whether leakage amounts of a first-stage sealing device, a second-stage sealing device and a third-stage sealing device under different pressure platforms meet acceptance criteria or not is verified, wherein the leakage amount of the first-stage sealing device is less than 800l/h (the control range is 400-600 l/h), the leakage amount of the second-stage sealing device is less than 7l/h, and the leakage amount of the third-stage sealing device is between 100cc/h and 1600cc/h (the control range is 400-1200 cc/h).
Step 7: dynamic test (see sequence G in fig. 1). And carrying out dynamic tests according to operation rules, wherein the dynamic tests comprise leakage quantity and stability detection tests of the first-stage sealing device, the second-stage sealing device and the third-stage sealing device under different pressure platforms, sealing performance influence tests under different parameter changes and sealing performance tests under abnormal working conditions, and determining whether each test result meets the acceptance requirement. Wherein the leakage amount of the first stage sealing device is confirmed to be 400l/h-600l/h, water is injected into the second stage sealing device and the third stage sealing device after the sealing components of the second stage sealing device and the third stage sealing device are operated for 6 hours, the leakage amount of the second stage sealing device is less than 7l/h when the water temperature is 70 ℃ and the pressure drop delta P is 1.55bar, the leakage amount of the third stage sealing device is 400cc/h-1200cc/h, the water temperature change is not more than +/-1.5 ℃ within 20 minutes after water injection, and the leakage amount amplitude is less than 1.5% within 8 hours after water injection.
Step 8: seal disassembly for proof of receipt storage (see sequence H in fig. 1).
And disassembling the first-stage sealing device, the second-stage sealing device and the third-stage sealing device of the main pump which are qualified in the test, checking the appearance and the visual inspection to confirm that the main pump is free from abnormality, and checking the appearance and the size by using a laser interferometer again if necessary, and finishing measurement and test data. The sealed storage condition after repair is constant temperature and constant humidity environment, and the sealed storage condition is used for sealed storage in factory building selection or improvement maintenance room.
The foregoing description of the embodiments of the present disclosure has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or the technical improvement of the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (8)
1. The method for repairing the mechanical seal of the main pump of the nuclear power station and verifying the test is characterized by comprising the following steps:
Step 1: cleaning and checking before repairing: cleaning and checking a first-stage sealing device, a second-stage sealing device and a third-stage sealing device to be repaired, if the defects of the first-stage sealing device, the second-stage sealing device and the third-stage sealing device are obviously not provided with repairing conditions, directly performing scrapping treatment, and if the first-stage sealing device, the second-stage sealing device and the third-stage sealing device are provided with repairing conditions, turning to step 2, wherein the first-stage sealing device is a non-contact sealing device, and the second-stage sealing device and the third-stage sealing device are contact sealing devices;
Step 2: measuring the size data of the first-stage sealing device, the second-stage sealing device and the third-stage sealing device according to the size checking requirement in the technical index, wherein the size data comprises the sizes, form and position tolerances, surface roughness and the cone angle of the sealing surfaces of the first-stage sealing device, the second-stage sealing device and the third-stage sealing device;
Step 3: the sealing surfaces of the second-stage sealing device and the third-stage sealing device are ground, the sealing surfaces of the second-stage sealing device and the third-stage sealing device are ground by using resin copper disc grinding equipment in combination with special grinding agents, so that no attachments are generated on the surfaces of the sealing surfaces, the thickness of a coating or the height allowance of a graphite boss meets the acceptance requirement, the first-stage sealing device is in non-contact sealing, the surface is in cone angle design, and the grinding procedure is not needed;
step 4: polishing the surface, namely polishing the moving rings and the static rings of the second-stage sealing device and the third-stage sealing device and the moving rings and the static rings of the first-stage sealing device which are ground in the step 3, so that the surface roughness after polishing meets the acceptance requirement;
Step 5: measuring the repaired size, namely measuring the repaired size data of the sealing surfaces of the first-stage sealing device, the second-stage sealing device and the third-stage sealing device according to the size checking requirement in the technical indexes, wherein the size data comprises the size, the form and position tolerance, the surface roughness and the cone angle of the sealing surfaces, comparing the measured repaired size data with the size data before repair and the checking requirement by using a measuring instrument, and judging whether the repairing requirement is met;
step 6: the static pressure test is carried out, the assembled and repaired main pump is sealed and mounted on a test bench to carry out the static pressure test, the static pressure test is carried out firstly according to the operation rules, and whether the leakage amounts of the first-stage sealing device, the second-stage sealing device and the third-stage sealing device under different pressure platforms meet the acceptance criterion is verified;
Step 7: dynamic tests, which are carried out according to operation rules, and include leakage quantity and stability detection tests of a first-stage sealing device, a second-stage sealing device and a third-stage sealing device under different pressure platforms, sealing performance influence tests under different parameter changes and sealing performance tests under abnormal working conditions, and whether all test results meet acceptance requirements is confirmed;
step 8: and (3) sealing, disassembling and checking storage, namely disassembling the first-stage sealing device, the second-stage sealing device and the third-stage sealing device which are qualified in the test, checking appearance and visual inspection, checking appearance and size by using a laser interferometer again if necessary, sorting measurement and test data, and sealing and storing conditions after repairing are constant temperature and constant humidity environments, wherein the sealing and storing conditions are used for sealing and storing in factory building selection or improvement overhaul rooms.
2. The method of claim 1, wherein step 1 further comprises:
Step 1.1: the first-stage sealing device, the second-stage sealing device and the third-stage sealing device are decontaminated and cleaned, so that the radioactive dose is reduced;
Step 1.2: cleaning the surfaces of the first-stage sealing device, the second-stage sealing device and the third-stage sealing device, and removing surface sediments;
Step 1.3: and carrying out visual inspection on the first-stage sealing device, the second-stage sealing device and the third-stage sealing device to confirm that no obvious damage defect exists, and recording the serial numbers of the parts.
3. The method of claim 1, wherein step 2 further comprises: and measuring and three-dimensionally imaging conical surfaces of the movable ring and the stationary ring of the first-stage sealing device, and measuring planeness and roughness of the surfaces of the movable ring and the stationary ring of the first-stage sealing device, the second-stage sealing device and the third-stage sealing device.
4. The method of claim 1, wherein the acceptance requirement at step 3 is: the height of the static ring graphite boss of the second sealing device is more than or equal to 1.65mm, and the height of the static ring graphite boss of the third sealing device is more than or equal to 1.5mm.
5. The method of claim 1, wherein the acceptance requirement at step4 is: the flatness of the sealing end surface of the movable ring is less than or equal to 0.0009mm, and the roughness value of the sealing end surface of the hard material sealing ring is less than or equal to 0.2 mu m; the flatness of the sealing end surface of the static ring is less than or equal to 0.0009mm, and the roughness value of the sealing end surface of the sealing ring made of soft material is less than or equal to 0.4 mu m.
6. The method of claim 1, wherein the acceptance criteria in step6 are: the leakage of the first-stage sealing device is 400-600 l/h, the leakage of the second-stage sealing device is less than 7l/h, and the leakage of the third-stage sealing device is 400-1200 cc/h.
7. The method of claim 1, wherein the test bed in step 6 is an integrated module, the rotation speed is adjustable, and the additional instrument panel can display test pressure, temperature and flow data on site and remotely transmit the data to the DCS control console, so that the full-range dynamic and static test of the three-stage mechanical seal can be performed.
8. The method of claim 1, wherein the acceptance requirement of step 7 is: the leakage amount of the first-stage sealing device is 400-600 l/h, after the sealing components of the second-stage sealing device and the third-stage sealing device are operated for 6 hours, water is injected into the second-stage sealing device and the third-stage sealing device, when the water temperature is 70 ℃ and the pressure drop is 1.55bar, the leakage amount of the second-stage sealing device is less than 7l/h, the leakage amount of the third-stage sealing device is 400-1200 cc/h, the water temperature change is not more than +/-1.5 ℃ within 20 minutes after water injection, and the leakage amount amplitude is less than 1.5% within 8 hours after water injection.
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| CN202211402055.6A CN118008874A (en) | 2022-11-10 | 2022-11-10 | Nuclear power station main pump mechanical seal repairing and test verification method |
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| CN202211402055.6A CN118008874A (en) | 2022-11-10 | 2022-11-10 | Nuclear power station main pump mechanical seal repairing and test verification method |
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| CN202211402055.6A Pending CN118008874A (en) | 2022-11-10 | 2022-11-10 | Nuclear power station main pump mechanical seal repairing and test verification method |
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- 2022-11-10 CN CN202211402055.6A patent/CN118008874A/en active Pending
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