CN109424373B - Application method of fire resistant oil in steam turbine regulating oil system - Google Patents
Application method of fire resistant oil in steam turbine regulating oil system Download PDFInfo
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- CN109424373B CN109424373B CN201710730046.2A CN201710730046A CN109424373B CN 109424373 B CN109424373 B CN 109424373B CN 201710730046 A CN201710730046 A CN 201710730046A CN 109424373 B CN109424373 B CN 109424373B
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- oil
- fire
- resistant oil
- resistant
- turbine
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/002—Cleaning of turbomachines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
Abstract
The application discloses an application method of fire resistant oil in a steam turbine regulating oil system, which comprises the following steps: the fuel-resistant oil content is controlled within the range of 300-500ppm, and the fuel-resistant oil temperature is set within the range of 45-50 ℃. This application can reduce the jam probability of filter screen among the steam turbine adjusting oil system, improves the life of filter screen among the steam turbine adjusting oil system.
Description
Technical Field
The application relates to an application method of a fire resistant oil, in particular to an application method of the fire resistant oil in a turbine regulating oil system, which is suitable for a nuclear power plant.
Background
In the past, the blocking frequency of a main filter screen of a unit GFR (steam turbine regulating oil system) of a nuclear power station is generally higher, and the shortest average service life is less than one month. Before, when a certain nuclear power unit is overhauled, a protective oil pipeline is mechanically washed, and the blocking frequency of a GFR main filter screen is still maintained at 21-29 times per cycle. And in the process of another overhaul after the overhaul, the GFR is chemically flushed (the chemical flushing modes of the two units are completely different), and the fire-resistant oil is mixed from the EHC + EHC PLUS to the EHC PLUS, wherein the EHC and the EHC PLUS are different fire-resistant oil models. However, after major repair, the blocking frequency of the main filter screen of the unit GFR is not obviously reduced, the service life of the filter screen is still not high, and the phenomena of jamming of the electromagnetic valve and blocking of the small filter screen occur.
Disclosure of Invention
The purpose of this application is: the application method of the fire resistant oil in the turbine regulating oil system is provided to reduce the blocking probability of a filter screen in the turbine regulating oil system and prolong the service life of the filter screen in the turbine regulating oil system.
In order to achieve the purpose, the technical scheme of the application is as follows:
a method for using fire-resistant oil in a turbine regulating oil system comprises the following steps:
the fuel-resistant oil content is controlled within the range of 300-500ppm, and the fuel-resistant oil temperature is set within the range of 45-50 ℃.
On the basis of the technical scheme, the application also comprises the following preferable scheme:
and flushing a fire-resistant oil pipeline of the turbine regulating oil system at regular intervals.
In the process of flushing the fire-resistant oil pipeline of the turbine regulating oil system, an external oil filter is used for filtering impurities of fire-resistant oil in the fire-resistant oil tank of the turbine regulating oil system.
In the process of flushing the fire resistant oil pipeline of the turbine regulating oil system, an external oil filter is used for continuously filtering impurities of fire resistant oil in the fire resistant oil tank of the turbine regulating oil system.
The temperature of the fire-resistant oil is set within the range of 45-48 ℃.
The fire-resistant oil temperature was set at 45 ℃.
The anti-fuel temperature was set at 48 ℃.
Controlling the fuel-resistant oil content within the range of 400ppm-500 ppm.
The moisture content of the flame-retardant oil was controlled to 400 ppm.
The application has the advantages that: through the control of the temperature and the moisture of the anti-fuel oil, particularly the oil moisture of the anti-fuel oil is controlled within the range of 300-500ppm, and the temperature of the anti-fuel oil is set within the range of 45-50 ℃, so that the service life of the GFR main filter screen is prolonged, the risk caused by filter screen replacement is reduced, the reliability of a GFR system is improved, and the safe operation of a unit is ensured.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments. The present application may be embodied in many different forms and is not limited to the embodiments described in the present embodiment.
One skilled in the relevant art will recognize, however, that one or more of the specific details can be omitted, or other methods, components, or materials can be used. In some instances, some embodiments are not described or not described in detail.
Furthermore, the technical features, aspects or characteristics described herein may be combined in any suitable manner in one or more embodiments. It will be readily appreciated by those of skill in the art that the order of the steps or operations of the methods associated with the embodiments provided herein may be varied. Thus, any order in the embodiments is for illustrative purposes only and does not imply a requirement in a certain order unless explicitly stated to require a certain order.
Summary of the application of this fire-resistant oil and its principles
The application method of the fire resistant oil in the steam turbine regulating oil system mainly comprises the following two aspects:
firstly, controlling the moisture content of the fire resistant oil in a turbine regulating oil system within the range of 300-500 ppm.
Secondly, setting the temperature of the fire resistant oil in the turbine regulating oil system within the range of 45-50 ℃.
In addition, in order to further reduce the clogging probability of the filter screen and improve the service time of the filter screen, the method also comprises the third aspect requirement: and flushing a fire-resistant oil pipeline of the turbine regulating oil system at regular intervals.
The specific introduction is as follows:
firstly, the moisture content of the fire resistant oil in the turbine regulating oil system is controlled within the range of 300-500 ppm.
The fire-resistant oil mainly comprises methyl phosphate, the phosphate can generate oxidation reaction under the action of water and heat to generate acid, and the acid product of the phosphate reacts with metal ions in the oil to generate metal salt. The freshly formed metal salts (Gels) dissolve in the fire-resistant oil and can flow through the screen within the system. And the catalyst is used, so that the oxidation of the fire-resistant oil is accelerated, and the generation of new metal salt is accelerated.
Gels deposits easily on the inner wall of the pipe and hardens to Varnish when heated. The less fluid the pipe is, the more likely it is to cause deposits, such as in the protection of oil pipes. The metal ions are mainly Ca, Mg, Na (diatomite filter screen), Al (activated alumina filter screen) released by the chemical filter element and Fe released by the abrasion of equipment.
The decomposition of phosphate to generate acidic substance is divided into three steps, the first benzene ring is replaced by oxygen ions of water molecules to form monophosphoric acid, and an alkylphenol is released at the same time. The second benzene ring is replaced to form polyphosphoric acid, which in turn releases an alkylphenol. After the third benzene ring is replaced, polyphosphoric acid is formed, and an alkylphenol is released again.
The specific reaction process is as follows:
wherein, polyphosphoric acid is dissolved in water, and has higher dissolution rate particularly under the conditions of high temperature and lower volume resistivity of the fire-resistant oil, and has lower dissolution rate particularly under the conditions of low temperature and higher volume resistivity of the fire-resistant oil, and is easy to separate out to become soluble jelly for blocking a filter element of a filter screen.
From the above reaction process, it can be seen that the fuel aging resistant product has the depositable carbide varnish and soluble jelly.
Therefore, the water content in the fire-resistant oil is improved, colloidal impurities can be dissolved again to a certain degree, and the service life of the filter element is prolonged. But the moisture should not be too high because it can accelerate the oxidation reaction of the oil.
From the EPRI fire resistance guidelines it can be seen that: most nuclear power plants require operating oil (fire resistant oil) in a turbine regulating oil system to be less than 1000-2000ppm, some nuclear power plants require the operating oil to be less than 1000ppm and actually less than 200ppm, and the water content is seriously low.
The inventor finds that the moisture content of the fire resistant oil in a turbine regulating oil system is controlled within the range of 300-500ppm, the existence of jelly can be greatly reduced, and the possibility of filter screen blockage is reduced.
In particular, we have found that by increasing the water content of the fire resistant oil above 400ppm, especially 400ppm, the life of the screen is significantly increased and the frequency of screen plugging is greatly reduced.
Secondly, setting the temperature of the fire resistant oil in the turbine regulating oil system within the range of 45-50 ℃.
The temperature of the fire-resistant oil cannot be too high or too low. If the temperature is too high, the deterioration of the fire-resistant oil is accelerated; when the temperature is too low, the viscosity of the fire-resistant oil is increased, the resistance in the filter screen is increased, and the filter screen is blocked in advance. Experiments show that the service life of the filter screen is immediately prolonged after the temperature of the fire-resistant oil rises.
In the past, the temperature of the fire resistant oil in a turbine oil regulating system in some nuclear power plants is only 42 ℃, and is seriously lower.
We find that the temperature of the fire resistant oil in the turbine regulating oil system is controlled within the range of 45-50 ℃. Not only can guarantee the performance of fire-resistant oil, but also greatly reduces the possibility of filter screen blockage.
And thirdly, in order to further reduce the blocking probability of the filter screen and improve the service time of the filter screen, the fire-resistant oil pipeline of the turbine oil regulating system is regularly flushed.
The necessity of flushing: the aging impurities of the fire-resistant oil can be deposited inside a fire-resistant oil pipeline of a turbine regulating oil system, and can enter precision parts such as an oil pump, a servo valve and the like during operation, and can be used as a catalyst to accelerate the aging of the fire-resistant oil. Periodic cleaning of the fire-resistant oil lines of the system is required.
The specific flushing method comprises the following steps: in order to ensure the flushing flow, two fire-resistant oil pumps are adopted to run in parallel, and one group of valves (one high-pressure regulating valve and the corresponding high-pressure stop valve) are flushed each time. And in the flushing process, an external oil filter is used for continuously (uninterruptedly) filtering impurities of the fire resistant oil in the fire resistant oil tank of the turbine regulating oil system.
Furthermore, we also set the flushing criteria, specifically: and sampling and analyzing the fire-resistant oil in the fire-resistant oil tank every half hour, and continuously decreasing the particle count twice to be qualified.
The first embodiment is as follows:
in the first embodiment, the main filter screen of the GFR (turbine regulating oil system) of the nuclear power unit has been frequently blocked in a previous period, and the blocking frequency of the filter screen is greatly reduced after the moisture content of the fire-resistant oil in the turbine regulating oil system of the nuclear power unit is increased to 400 ppm.
Example two:
the nuclear power generating unit in the second embodiment includes two units, which are a first unit and a second unit respectively, and since the nuclear power generating unit in the second embodiment is overhauled, the GFR main filter screen of the first unit is blocked 7 times. The oil temperature of the fire-resistant oil in the fire-resistant oil tank of the first unit GFR and the second unit GFR is only about 41 ℃, and the temperature of the first unit is 0.7 ℃ lower than that of the second unit. At that time, according to a low-temperature plan, the fire-resistant oil temperature setting values of the first unit GFR and the second unit GFR are increased from 43 ℃ to 45 ℃, meanwhile, after the water content is controlled to be 400ppm, the blocking frequency of main filter screens of the two units GFR is greatly reduced, the maximum summer time of the two units can reach 102/67 days, and the two units normally run for 4-5 months (the maximum summer time is only 3 months originally). In order to verify the relation between the operating time and the oil temperature of the filter screen at the beginning of 9 months in 2014, the temperature fixed value of the GFR A row of the first unit is restored to 43 ℃, and the service life of the filter screen is immediately reduced to 32 days. The direct proportion relation between the temperature of the fire-resistant oil and the operation time of the filter screen is verified from the reverse side.
Example three:
the nuclear power generating unit in the third embodiment also comprises two units, namely a first unit and a second unit, and when the nuclear power generating unit is overhauled, the fire resistant oil used by the GFR of the first unit and the GFR of the second unit are replaced by great lake fire resistant oil. The shortest running time of the main filter screen in the initial stage after overhaul is only one week. Then, the moisture and the oil temperature of the fire resistant oil in the GFR of the first unit and the GFR of the second unit are optimally controlled, the moisture and the oil temperature of the fire resistant oil in the GFR of the first unit and the GFR of the second unit are controlled to be about 500ppm, and the temperature of the fire resistant oil in a turbine oil regulating system is set to be about 50 ℃. At present, the running time of a main filter screen (an old filter screen) of the first unit GFR reaches 138 days, and the running time of a main filter screen (a new type filter screen, the flow area of which is increased by 30 percent compared with the old filter screen) of the second unit GFR reaches 279 days. The service life of the filter screen is improved fundamentally.
Example four:
in the fourth embodiment, when the nuclear power unit is overhauled, the fire-resistant oil used by the unit GFR is changed into great lake fire-resistant oil, the influence of low temperature on the viscosity of the great lake fire-resistant oil is large, and meanwhile, the water content of the fire-resistant oil cannot be increased to more than 400ppm due to low temperature, so that the oil temperature fixed value of the GFR main pipe is increased to 48 ℃, the water content of the fire-resistant oil reaches 400ppm through a corresponding flow, and the service life of the filter screen is obviously prolonged.
Example five:
the inventor realizes that the moisture has a certain effect on prolonging the service life of the filter screen, so that the moisture of the fire-resistant oil is improved to 500ppm by means of exiting from a GFR oil tank breather of the nuclear power unit in the fifth embodiment, changing the fixed value of a vacuum pump and the like, and the service life of the filter screen of each steam turbine oil regulating system is obviously prolonged after the moisture of the fire-resistant oil is regulated.
Example six (comparative):
in the sixth embodiment, the fire-resistant oil pipeline of the GFR is flushed during overhaul of the nuclear power unit, the protective oil pipeline in front of the valve is replaced, the pipeline trend is improved, hot spots are avoided, and a new EHC PLUS (fire-resistant oil model) is replaced. However, the moisture and temperature of the fire-resistant oil are not adjusted and both the temperature and level are maintained at reduced levels. After overhaul, although the phenomenon of jamming of the solenoid valve does not occur, the running time of the main filter screen is still short, and the phenomenon of blocking of the small filter screen at the power oil inlet of the GRE valve occurs.
The operation data in the above embodiments are all confidential materials of the applicant, and are never disclosed before the disclosure of the present patent application.
The foregoing is a more detailed description of the present invention that is presented in conjunction with specific embodiments, and the practice of the invention is not to be considered limited to those descriptions. It will be apparent to those skilled in the art that a number of simple derivations or substitutions can be made without departing from the inventive concept.
Claims (7)
1. A method for applying fire resistant oil to a turbine conditioned oil system, comprising:
the fire-resistant oil mainly comprises methyl phosphate, the phosphate can generate oxidation reaction under the action of water and heat to generate acid, and the acid product reacts with metal ions in the oil to generate polyphosphate;
polyphosphate is dissolved in water and is easy to separate out to form soluble jelly for blocking a filter element of a filter screen;
controlling the fuel oil resistance in the range of 400-500ppm, and setting the fuel oil resistance temperature in the range of 45-48 ℃;
the water content in the fire-resistant oil is improved, and the dissoluble jelly can be dissolved again, so that the service life of the filter element is prolonged.
2. The method of using a fire resistant oil in a turbine conditioned oil system according to claim 1, further comprising: and flushing a fire-resistant oil pipeline of the turbine regulating oil system at regular intervals.
3. The method for applying the fire-resistant oil in the turbine regulating oil system according to claim 2, wherein in the process of flushing the fire-resistant oil pipeline of the turbine regulating oil system, an external oil filter is used for filtering impurities of the fire-resistant oil in the fire-resistant oil tank of the turbine regulating oil system.
4. The method for applying the fire-resistant oil in the turbine regulating oil system according to claim 3, wherein in the process of flushing the fire-resistant oil pipeline of the turbine regulating oil system, an external oil filter is used for continuously filtering impurities of the fire-resistant oil in the fire-resistant oil tank of the turbine regulating oil system.
5. The method of using a fire resistant oil in a turbine control oil system according to claim 1 or 2 or 3 or 4, wherein the fire resistant oil temperature is set at 45 ℃.
6. The method for using a fire resistant oil in a turbine control oil system according to claim 1 or 2 or 3 or 4, wherein the fire resistant oil temperature is set at 48 ℃.
7. The method of using a fire resistant oil in a turbine control oil system according to claim 1, wherein the fire resistant oil is controlled to a moisture content of 400 ppm.
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| CN201710730046.2A CN109424373B (en) | 2017-08-23 | 2017-08-23 | Application method of fire resistant oil in steam turbine regulating oil system |
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| CN201710730046.2A CN109424373B (en) | 2017-08-23 | 2017-08-23 | Application method of fire resistant oil in steam turbine regulating oil system |
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| CN109424373B true CN109424373B (en) | 2022-03-22 |
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| GB1600734A (en) * | 1977-03-08 | 1981-10-21 | British Petroleum Co | Fire resistant grease |
| AU2002212954A1 (en) * | 2000-08-04 | 2002-02-18 | Exxonmobil Research And Engineering Company | Method for lubricating high pressure hydraulic system using phosphate ester hydraulic fluid |
| CN101829540A (en) * | 2010-05-19 | 2010-09-15 | 上海莎博化工科技有限公司 | Fire resistant oil purification and adsorption composite material of EHC (Effective Heat of Combustion) system as well as preparation method and application thereof |
| CN104403773B (en) * | 2014-10-20 | 2018-02-06 | 中国石油化工股份有限公司 | A kind of hydraulic oil |
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|---|---|---|---|---|
| JPH0610614A (en) * | 1992-06-24 | 1994-01-18 | Hitachi Ltd | Turbine lubricating oil nature regulating device |
| EP0889115A2 (en) * | 1997-07-03 | 1999-01-07 | Toyota Jidosha Kabushiki Kaisha | An engine oil deterioration preventing agent and device |
| CN1335380A (en) * | 2000-07-20 | 2002-02-13 | 广东省电力工业局试验研究所 | Method of regenerating degraded oil for electric power equipment |
| CN101843990A (en) * | 2009-11-06 | 2010-09-29 | 重庆工商大学 | Fire-resistant oil purification treatment method and device thereof |
| CN104415951A (en) * | 2013-08-21 | 2015-03-18 | 中国广核集团有限公司 | Method for washing oil adjusting system of steam turbine at nuclear power station |
| CN205495007U (en) * | 2016-02-05 | 2016-08-24 | 上海华电电力发展有限公司 | Online dewatering device of fire resistant oil |
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