CN109458351B - Nuclear-grade centrifugal pump mechanical seal life detection method based on equipment maintenance data - Google Patents
Nuclear-grade centrifugal pump mechanical seal life detection method based on equipment maintenance data Download PDFInfo
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- CN109458351B CN109458351B CN201811237415.5A CN201811237415A CN109458351B CN 109458351 B CN109458351 B CN 109458351B CN 201811237415 A CN201811237415 A CN 201811237415A CN 109458351 B CN109458351 B CN 109458351B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0088—Testing machines
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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
- G01M13/00—Testing of machine parts
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- General Physics & Mathematics (AREA)
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- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
The invention relates to the technical field of equipment reliability management of nuclear power plants, and particularly discloses a method for detecting the service life of a mechanical seal of a nuclear-grade centrifugal pump based on equipment maintenance data. The method comprises the following steps: 1. selecting key parameters of life change of the nuclear-grade centrifugal pump; 2. acquiring influence factor data of the mechanical seal life of the nuclear-grade centrifugal pump during overhaul of the nuclear power plant at all times; 3. performing trend fitting of the life-time influence factors of the nuclear-grade centrifugal pump; 4. fitting the trend of the mechanical seal life of the nuclear-grade centrifugal pump by using a trend fitting curve of the life influence factors of the nuclear-grade centrifugal pump; 5. and (4) predicting the service life of the mechanical seal of the nuclear-grade centrifugal pump according to the service life trend fitting curve of the mechanical seal of the nuclear-grade centrifugal pump. The method for detecting the service life of the mechanical seal of the nuclear-grade centrifugal pump based on the equipment maintenance data can scientifically and reasonably predict the service life of the mechanical seal of the nuclear-grade centrifugal pump, improve the operation safety of nuclear power equipment and reduce the operation cost.
Description
Technical Field
The invention belongs to the technical field of equipment reliability management of nuclear power plants, and particularly relates to a method for detecting the mechanical seal life of a nuclear-grade centrifugal pump based on equipment maintenance data.
Background
The nuclear-grade centrifugal pump is an important component of a nuclear power plant system, is one of important links for maintaining the normal operation of the nuclear power plant system, and plays an important role in the safety, reliability and economic operation of a nuclear power plant in consideration of the requirement of radioactive containment of the nuclear power plant.
The mechanical seal is one of the important components of the centrifugal pump, and the service life of the mechanical seal has a direct influence on the service life of the pump. Statistically, about 40% of the common failures of pump-type devices are caused by leakage or failure of mechanical seals. Therefore, the nuclear centrifugal pump equipment has high requirements on the safety of mechanical seal, and the trend analysis of the nuclear centrifugal pump in the service life of the mechanical seal at home and abroad is still blank at present.
Disclosure of Invention
The invention aims to provide a method for detecting the service life of a mechanical seal of a nuclear-grade centrifugal pump based on equipment maintenance data, which can be used for prejudging the service life of the mechanical seal of the nuclear-grade centrifugal pump and improving the operation safety of nuclear power equipment.
The technical scheme of the invention is as follows: a method for detecting the service life of a mechanical seal of a nuclear-grade centrifugal pump based on equipment maintenance data specifically comprises the following steps:
step 1, selecting key parameters of life change of a nuclear-grade centrifugal pump;
step 2, acquiring influence factor data of the mechanical seal life of the nuclear-grade centrifugal pump during the overhaul period of the nuclear power plant at all times;
step 3, performing trend fitting of the life-time influence factors of the nuclear-grade centrifugal pump;
step 4, utilizing a trend fitting curve of the life-time influence factors of the nuclear-grade centrifugal pump to perform trend fitting of the mechanical seal life time of the nuclear-grade centrifugal pump;
and 5, predicting the service life of the mechanical seal of the nuclear-grade centrifugal pump according to the service life trend fitting curve of the mechanical seal of the nuclear-grade centrifugal pump.
The step 1 specifically comprises the following steps:
according to the historical life data of the nuclear-grade centrifugal pump in the nuclear power plant, key influence factors reflecting the life change of the nuclear-grade centrifugal pump are determined, and the key influence factors mainly comprise mechanical sealing surface abrasion, O-shaped ring abrasion and spring compression change.
The step 2 specifically comprises the following steps:
aiming at the overhaul of the nuclear power plant at all times, the abrasion loss of the mechanical sealing surface of the nuclear centrifugal pump, the abrasion loss of the O-shaped ring and the compression data of the spring are collected, and the abrasion rate of the mechanical sealing surface of the nuclear centrifugal pump, the abrasion rate of the O-shaped ring and the compression change rate of the spring are obtained according to the corresponding original factory parameters in the prokaryotic centrifugal pump.
The step 3 specifically comprises the following steps:
data of the mechanical seal of the nuclear-grade centrifugal pump in the whole service life of the mechanical seal during overhaul of the nuclear power plant are utilized to respectively obtain a mechanical seal surface wear trend fitting curve B of the mechanical seal surface wear rate changing with time, an O-shaped ring wear trend fitting curve B of the A, O mechanical seal surface wear rate changing with time, and a spring compression amount trend fitting curve C of the spring compression change rate changing with time.
The step 4 specifically comprises:
and (3) fitting the mechanical seal surface wear trend fitting curve A, O type ring wear trend fitting curve B and the spring compression amount trend fitting curve C obtained in the step (3) according to the weights of a%, B% and C%, and finally obtaining a nuclear-grade centrifugal pump mechanical seal life trend fitting curve.
The step 5 specifically comprises the following steps: and (4) fitting a curve according to the service life trend of the mechanical seal of the nuclear-grade centrifugal pump obtained in the step (4) to be used as a basis for predicting the service life of the mechanical seal of the nuclear-grade centrifugal pump and judging whether the mechanical seal of the nuclear-grade centrifugal pump is replaced during the overhaul period of the main heat transmission system of the nuclear power plant.
And 4, fitting the mechanical seal surface wear trend fitting curve A, O, the ring wear trend fitting curve B and the spring compression amount trend fitting curve C in the step 4 according to weights of 60%, 20% and 20% respectively, and finally obtaining a core-grade centrifugal pump mechanical seal life trend fitting curve.
And 3, fitting the trend of the influence factors of the mechanical seal life of each nuclear-grade centrifugal pump in the step 3, wherein the trend at least comprises detection data of 3 times of overhaul periods of the nuclear power plant in the full life of the mechanical seal of the nuclear-grade centrifugal pump.
The invention has the following remarkable effects: the method for detecting the service life of the mechanical seal of the nuclear-grade centrifugal pump based on the equipment maintenance data can scientifically and reasonably predict the service life of the mechanical seal of the nuclear-grade centrifugal pump, improve the operation safety of nuclear power equipment and reduce the operation cost.
Detailed Description
A method for detecting the service life of a mechanical seal of a nuclear-grade centrifugal pump based on equipment maintenance data specifically comprises the following steps:
step 1, selecting key parameters of life change of a nuclear-grade centrifugal pump;
determining key influence factors reflecting the life change of the nuclear-grade centrifugal pump according to the historical life data of the nuclear-grade centrifugal pump in the nuclear power plant, wherein the key influence factors mainly comprise mechanical sealing surface abrasion, O-shaped ring abrasion and spring compression change;
step 2, acquiring influence factor data of the mechanical seal life of the nuclear-grade centrifugal pump during the overhaul period of the nuclear power plant at all times;
aiming at the overhaul of a nuclear power plant at all times, acquiring data of the abrasion amount of a mechanical sealing surface, the abrasion amount of an O-shaped ring and the compression amount of a spring in a nuclear-grade centrifugal pump, and acquiring the abrasion rate of the mechanical sealing surface of the nuclear-grade centrifugal pump, the abrasion rate of the O-shaped ring and the compression change rate of the spring according to corresponding original factory parameters in the prokaryotic-grade centrifugal pump;
step 3, performing trend fitting of the life-time influence factors of the nuclear-grade centrifugal pump;
respectively obtaining a mechanical sealing surface wear trend fitting curve A, O of the mechanical sealing surface wear rate changing with time, and an O-shaped ring wear trend fitting curve B of the mechanical sealing surface wear rate changing with time and a spring compression amount trend fitting curve C of the spring compression change rate changing with time by using data of the nuclear centrifugal pump in the mechanical sealing life of the nuclear power plant in the overhaul period of the previous nuclear power plant; the trend fitting of the influence factors of the mechanical seal life of each nuclear-grade centrifugal pump needs to at least contain detection data of 3 times of overhaul periods of the nuclear power plant in the mechanical seal life of the nuclear-grade centrifugal pump;
step 4, utilizing a trend fitting curve of the life-time influence factors of the nuclear-grade centrifugal pump to perform trend fitting of the mechanical seal life time of the nuclear-grade centrifugal pump;
fitting the mechanical seal surface wear trend fitting curve A, O type ring wear trend fitting curve B and the spring compression amount trend fitting curve C obtained in the step 3 according to the weights of a%, B% and C%, for example, fitting according to the weights of 60%, 20% and 20%, and finally obtaining a nuclear grade centrifugal pump mechanical seal life trend fitting curve;
step 5, predicting the service life of the mechanical seal of the nuclear-grade centrifugal pump according to a fitting curve of the service life trend of the mechanical seal of the nuclear-grade centrifugal pump;
and (4) fitting a curve according to the service life trend of the mechanical seal of the nuclear-grade centrifugal pump obtained in the step (4) to be used as a basis for predicting the service life of the mechanical seal of the nuclear-grade centrifugal pump and judging whether the mechanical seal of the nuclear-grade centrifugal pump is replaced during the overhaul period of the main heat transmission system of the nuclear power plant.
Claims (8)
1. A nuclear-grade centrifugal pump mechanical seal life detection method based on equipment maintenance data is characterized by comprising the following steps: the method specifically comprises the following steps:
step 1, selecting key parameters of life change of a nuclear-grade centrifugal pump;
step 2, acquiring influence factor data of the mechanical seal life of the nuclear-grade centrifugal pump during the overhaul period of the nuclear power plant at all times;
step 3, performing trend fitting of the life-time influence factors of the nuclear-grade centrifugal pump;
step 4, utilizing a trend fitting curve of the life-time influence factors of the nuclear-grade centrifugal pump to perform trend fitting of the mechanical seal life time of the nuclear-grade centrifugal pump;
and 5, predicting the service life of the mechanical seal of the nuclear-grade centrifugal pump according to the service life trend fitting curve of the mechanical seal of the nuclear-grade centrifugal pump.
2. The method for detecting the service life of the mechanical seal of the nuclear-grade centrifugal pump based on the equipment maintenance data as claimed in claim 1, wherein the method comprises the following steps: the step 1 specifically comprises the following steps:
according to the historical life data of the nuclear-grade centrifugal pump of the nuclear power plant, key parameters reflecting the life change of the nuclear-grade centrifugal pump are determined, and the key parameters mainly comprise mechanical sealing surface abrasion, O-shaped ring abrasion and spring compression change.
3. The method for detecting the service life of the mechanical seal of the nuclear-grade centrifugal pump based on the equipment maintenance data as claimed in claim 1, wherein the method comprises the following steps: the step 2 specifically comprises the following steps:
aiming at the overhaul of the nuclear power plant at all times, the abrasion loss of the mechanical sealing surface of the nuclear centrifugal pump, the abrasion loss of the O-shaped ring and the compression data of the spring are collected, and the abrasion rate of the mechanical sealing surface of the nuclear centrifugal pump, the abrasion rate of the O-shaped ring and the compression change rate of the spring are obtained according to the corresponding original factory parameters in the prokaryotic centrifugal pump.
4. The method for detecting the service life of the mechanical seal of the nuclear-grade centrifugal pump based on the equipment maintenance data as claimed in claim 1, wherein the method comprises the following steps: the step 3 specifically comprises the following steps:
data of the mechanical seal of the nuclear-grade centrifugal pump in the whole service life of the mechanical seal during overhaul of the nuclear power plant are utilized to respectively obtain a mechanical seal surface wear trend fitting curve B of the mechanical seal surface wear rate changing with time, an O-shaped ring wear trend fitting curve B of the A, O mechanical seal surface wear rate changing with time, and a spring compression amount trend fitting curve C of the spring compression change rate changing with time.
5. The method for detecting the service life of the mechanical seal of the nuclear-grade centrifugal pump based on the equipment maintenance data as claimed in claim 4, wherein the method comprises the following steps: the step 4 specifically comprises:
and (3) fitting the mechanical seal surface wear trend fitting curve A, O type ring wear trend fitting curve B and the spring compression amount trend fitting curve C obtained in the step (3) according to the weights of a%, B% and C%, and finally obtaining a nuclear-grade centrifugal pump mechanical seal life trend fitting curve.
6. The method for detecting the service life of the mechanical seal of the nuclear-grade centrifugal pump based on the equipment maintenance data as claimed in claim 1, wherein the method comprises the following steps: the step 5 specifically comprises the following steps: and (4) fitting a curve according to the service life trend of the mechanical seal of the nuclear-grade centrifugal pump obtained in the step (4) to be used as a basis for predicting the service life of the mechanical seal of the nuclear-grade centrifugal pump and judging whether the mechanical seal of the nuclear-grade centrifugal pump is replaced during the overhaul period of the main heat transmission system of the nuclear power plant.
7. The method for detecting the service life of the mechanical seal of the nuclear-grade centrifugal pump based on the equipment maintenance data as claimed in claim 5, wherein the method comprises the following steps: and 4, fitting the mechanical seal surface wear trend fitting curve A, O, the ring wear trend fitting curve B and the spring compression amount trend fitting curve C in the step 4 according to weights of 60%, 20% and 20% respectively, and finally obtaining a core-grade centrifugal pump mechanical seal life trend fitting curve.
8. The method for detecting the service life of the mechanical seal of the nuclear-grade centrifugal pump based on the equipment maintenance data as claimed in claim 4, wherein the method comprises the following steps: and 3, fitting the trend of the influence factors of the mechanical seal life of each nuclear-grade centrifugal pump in the step 3, wherein the trend at least comprises detection data of 3 times of overhaul periods of the nuclear power plant in the full life of the mechanical seal of the nuclear-grade centrifugal pump.
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| CN117109909B (en) * | 2023-10-24 | 2023-12-22 | 张家港市赛斯机械密封有限公司 | Detection and early warning method and system for mechanical sealing performance of large-shaft-diameter semi-split type machine |
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