CN114645740B - Device and method for adding micro-positive pressure water removal and acid value reduction into anti-fuel oil tank - Google Patents
Device and method for adding micro-positive pressure water removal and acid value reduction into anti-fuel oil tank Download PDFInfo
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- CN114645740B CN114645740B CN202011504221.4A CN202011504221A CN114645740B CN 114645740 B CN114645740 B CN 114645740B CN 202011504221 A CN202011504221 A CN 202011504221A CN 114645740 B CN114645740 B CN 114645740B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 45
- 239000002253 acid Substances 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000000295 fuel oil Substances 0.000 title description 5
- 230000009970 fire resistant effect Effects 0.000 claims abstract description 62
- 238000002955 isolation Methods 0.000 claims abstract description 44
- 239000002245 particle Substances 0.000 claims abstract description 21
- 238000012544 monitoring process Methods 0.000 claims description 13
- 238000005070 sampling Methods 0.000 claims description 9
- 230000006837 decompression Effects 0.000 claims description 6
- 238000010926 purge Methods 0.000 claims description 6
- 239000012535 impurity Substances 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 4
- 230000003749 cleanliness Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 3
- 239000000446 fuel Substances 0.000 claims description 2
- 238000012795 verification Methods 0.000 claims description 2
- 238000012423 maintenance Methods 0.000 abstract description 8
- 230000015556 catabolic process Effects 0.000 abstract description 6
- 238000006731 degradation reaction Methods 0.000 abstract description 6
- 239000003921 oil Substances 0.000 description 128
- 229910019142 PO4 Inorganic materials 0.000 description 11
- 239000010452 phosphate Substances 0.000 description 11
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 9
- 239000000047 product Substances 0.000 description 8
- 238000006460 hydrolysis reaction Methods 0.000 description 7
- 230000001105 regulatory effect Effects 0.000 description 4
- 230000007062 hydrolysis Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- -1 phosphate ester Chemical class 0.000 description 2
- 239000000741 silica gel Substances 0.000 description 2
- 229910002027 silica gel Inorganic materials 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000005844 autocatalytic reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 239000007857 degradation product Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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
- F01D17/00—Regulating or controlling by varying flow
- F01D17/20—Devices dealing with sensing elements or final actuators or transmitting means between them, e.g. power-assisted
- F01D17/22—Devices dealing with sensing elements or final actuators or transmitting means between them, e.g. power-assisted the operation or power assistance being predominantly non-mechanical
- F01D17/26—Devices dealing with sensing elements or final actuators or transmitting means between them, e.g. power-assisted the operation or power assistance being predominantly non-mechanical fluid, e.g. hydraulic
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/26—Oils; Viscous liquids; Paints; Inks
- G01N33/28—Oils, i.e. hydrocarbon liquids
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/26—Oils; Viscous liquids; Paints; Inks
- G01N33/28—Oils, i.e. hydrocarbon liquids
- G01N33/2835—Specific substances contained in the oils or fuels
- G01N33/2841—Gas in oils, e.g. hydrogen in insulating oils
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Medicinal Chemistry (AREA)
- General Health & Medical Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Pathology (AREA)
- Food Science & Technology (AREA)
- Immunology (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- General Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Measuring Fluid Pressure (AREA)
- Feeding And Controlling Fuel (AREA)
Abstract
The invention belongs to the technical field of turbine fire-resistant oil systems, and particularly relates to a device and a method for adding micro-positive pressure water removal and acid value reduction into a fire-resistant oil tank. According to the invention, a DN25 compressed air pipeline is connected to a fire-resistant oil tank, a particle filter is arranged on the DN25 compressed air pipeline, the end part of the DN25 compressed air pipeline is connected with external compressed air, an oil tank inlet check valve is arranged at the inlet position of the fire-resistant oil tank, an oil tank inlet isolation valve is arranged at the front end of the oil tank inlet check valve, the oil tank inlet isolation valve is connected with a tee joint, the tee joint is respectively connected with a secondary pressure reducing valve and a stop valve, the other end of the secondary pressure reducing valve is connected with the particle filter, the other end of the particle filter is connected with a primary pressure reducing valve, the primary pressure reducing valve is connected with the tee joint, and the tee joint is respectively connected with the isolation valve and the stop valve. The invention can greatly reduce the degradation speed of the fire-resistant oil product, save the maintenance cost of the fire-resistant oil system and improve the working efficiency and the system safety.
Description
Technical Field
The invention belongs to the technical field of turbine fire-resistant oil systems, and particularly relates to a device and a method for adding micro-positive pressure water removal and acid value reduction into a fire-resistant oil tank.
Background
With the high-speed development of the power industry, large-capacity and high-parameter units are more and more, and in order to ensure the safe and economic operation of the units, a turbine speed regulating system mostly adopts phosphate fire-resistant oil. The system mainly provides power oil and safety oil for the high-pressure and medium-pressure main steam valve oil engine, is used for adjusting and controlling the steam inlet quantity of the high-pressure and medium-pressure cylinder of the steam turbine, and can timely brake and stop under accident working conditions to play a role in protection, so that the stability of the fire-resistant oil system directly influences the safety performance of the unit.
The fire-resistant oil consists of phosphate, and has the advantages of transparent and uniform appearance, slightly yellowish or orange color of new oil, no precipitate, low volatility, good wear resistance and stable physical property, the fire-resistant oil used by the electrohydraulic control system in the power plant is fire-resistant pure phosphate liquid, the fire resistance is one of the most outstanding characteristics of the phosphate, the fire-resistant oil is difficult to burn at extremely high temperature, the fire does not spread or can be automatically extinguished soon after being ignited, and the phosphate has higher thermal oxidation stability.
However, in the operation process, the oil quality degradation is very easy to occur, and the operation indexes of the EH fire-resistant oil comprise acidity, viscosity, water content, granularity, chlorine content, resistivity and the like. Wherein acidity, water content, and particle size are the most important factors affecting EH fire-resistant oil quality:
1. the acid value exceeds the standard: the main reasons for the increase of the acid value are the oxidation reaction and the hydrolysis reaction of the EH oil, and the oxidation of the EH oil is aggravated and the acid value is increased due to the high temperature. The oil temperature adjusting function can be realized through the oil cooler, so that the oil quality degradation of the fire-resistant oil system caused by the increase of the oil temperature is effectively prevented;
2. the water content exceeds the standard: the water in the oil mainly comes from aging of the oil product and an air filter at the top of the oil tank, and air is condensed into water droplets in the oil tank to be mixed into the oil after entering the oil tank;
3. the granularity exceeds the standard: because the water content of the fire-resistant oil is high, the oil quality degradation products and the system corrosion products are increased after long-term operation, and the granularity of the EH fire-resistant oil system exceeds the standard. The granularity in the EH oil exceeds the standard, so that the blocking, failure and orifice blockage of a control element are caused, the element abrasion is accelerated, particularly, an electromagnetic valve in the system is more sensitive to granularity, the electromagnetic valve is blocked after long-term operation, and the regulating function is reduced.
Most unit fire-resistant oil devices of the power plant are generally only provided with functional units for removing acid and particles, but do not have a water removal function. In fact, the phosphate ester fire resistant oil hydrolysis process is a process that allows the hydrolysis products to decompose rapidly. Once hydrolysis occurs, the rate of degradation of the fire resistant oil increases, so moisture is the primary cause of the increase in the acid number of the phosphate fire resistant oil; while the hydrolysis reaction produces a large amount of acid, the amount of acid produced by the hydrolysis reaction is not linear but varies with the acid value: the high acid value can lead to faster hydrolysis reaction (autocatalysis reaction), and the high acid value can promote corrosion of operating parts and seriously affect safe and stable operation of a unit. Therefore, the water content in the fire-resistant oil is an important control index of a power plant speed-regulating oil system, and the fire-resistant oil needs to be detected regularly, and the fire-resistant oil needs to be dehydrated immediately when the water content exceeds the standard.
The fire-resistant oil systems of the units all adopt external vacuum oil filters to remove water and filter phosphate type fire-resistant oil of the fire-resistant oil systems, the water content can be reduced but cannot be maintained, and higher maintenance cost is required to be input. The filtering method has the premise that the water is removed after the water enters the oil, and the essential difference is achieved between the water entering the oil and the oil preventing of the water from entering the oil fundamentally.
Therefore, it is needed to provide a device and a method for adding micro-positive pressure water removal and acid value reduction for a fire-resistant oil tank.
Disclosure of Invention
The invention aims to provide a device and a method for adding micro-positive pressure water removal and acid value reduction for a fire-resistant oil tank aiming at the working requirements of maintenance of a phosphate type fire-resistant oil product of a turbine speed regulating system, which can greatly reduce the degradation speed of the fire-resistant oil product, save the maintenance cost of the fire-resistant oil system and improve the working efficiency and the system safety.
The invention adopts the technical scheme that:
a method for adding micro-positive pressure water removal and acid value reduction to a fire-resistant oil tank is based on a method for adding micro-positive pressure water removal device to the fire-resistant oil tank for a nuclear power station, and the device comprises the following steps: the fuel resistant oil tank is connected with a DN25 compressed air pipeline, a particle filter is arranged on the DN25 compressed air pipeline, and the end part of the DN25 compressed air pipeline is connected with external compressed air; the fire-resistant oil tank further comprises an oil tank inlet check valve and an oil tank inlet isolation valve, wherein the oil tank inlet check valve is arranged at the inlet position of the fire-resistant oil tank, and the oil tank inlet isolation valve is arranged at the front end of the oil tank inlet check valve; the system also comprises a second-stage pressure reducing valve and a second stop valve, wherein the oil tank inlet isolation valve is connected with a tee joint, and the tee joint is respectively connected with the second-stage pressure reducing valve and the second stop valve; a front gas pressure monitoring meter of the oil tank is arranged on the three-way pipeline close to the secondary pressure reducing valve; the other end of the secondary pressure reducing valve is connected with a particle filter, the other end of the particle filter is connected with a primary pressure reducing valve, and a pipeline of the particle filter is provided with a primary pressure reducing valve rear pressure gauge; the first-stage pressure reducing valve is connected with a tee joint, the tee joint is respectively connected with an isolation valve and a first stop valve, and a front pressure gauge of the first-stage pressure reducing valve is arranged on a tee pipeline close to the first-stage pressure reducing valve; the method comprises the following steps:
step 1, purging function: closing an oil tank inlet isolation valve, closing a first stop valve, and opening the isolation valve and a second stop valve;
step 2, checking gas pressure: opening an isolation valve, closing a first stop valve, opening a second stop valve and closing an oil tank inlet isolation valve, at the moment, firstly performing pressure verification on a first-stage pressure reducing valve, and monitoring a pressure gauge before the first-stage pressure reducing valve and a pressure gauge after the first-stage pressure reducing valve by monitoring, wherein the pressure of gas after being reduced by the first-stage pressure reducing valve is required to be maintained at 1bar; then the gas before entering the oil tank is decompressed through a secondary decompression valve, the gas pressure is monitored through a gas pressure monitoring meter before the oil tank, and the gas pressure after being decompressed through the secondary decompression valve is maintained at 5-15Kpa and can enter the oil tank; restoring the running state of the device after the adjustment is finished;
step 3, online sampling function: the second stop valve can be used for purging or a sampling port of the device, and the cleanliness of the gas entering the system can be monitored by sampling at the second stop valve, so that the purifying effect of the device is ensured;
step 4, water removal function: the isolation valve is opened, the oil tank inlet isolation valve is opened, the first stop valve is closed, the second stop valve is closed, clean compressed air is introduced into the device through the isolation valve to ensure good gas phase space environment in the fire-resistant oil tank, after the compressed air is introduced into the device, the pressure of gas entering the filter is ensured to be kept at about 1bar after passing through the first-stage pressure reducing valve, the filter is prevented from being damaged due to overhigh pressure of the gas, the impurity content of the filtered gas after passing through the filter is kept to be less than 200ppm, the pressure of the gas after passing through the second-stage pressure reducing valve is maintained at 5-15KPa to prevent fluctuation of the oil level of the oil tank caused by overhigh pressure, the liquid level of the oil tank is falsely alarmed, and clean compressed air is introduced into the system through the oil tank inlet isolation valve, so that the gas with higher water content in the oil tank can be discharged out of the oil tank, and the gas with higher external pollution degree can be prevented from entering the oil tank on the other hand;
step 5, protection function: the device is protected by the check valve.
Compared with the prior art, the invention has the beneficial effects that:
(1) The invention provides a device and a method for adding micro-positive pressure water removal and acid value reduction for a fire-resistant oil tank, which can be used for water removal and filtration of phosphate fire-resistant oil of a speed regulating system in daily and overhaul periods of a turbine unit, improves the quality of fire-resistant oil, greatly saves the use and maintenance cost of fire-resistant oil, and can be applied to the field of fire-resistant oil systems of various turbines.
(2) The invention provides a device and a method for adding micro-positive pressure water removal and acid value reduction for an anti-fuel oil tank, which have the advantages of simple structure, no moving parts, easy installation, high safety and reliability and lower maintenance cost;
(3) The invention provides a device and a method for adding micro-positive pressure water removal and acid value reduction for a fire-resistant oil tank, which can ensure that oil quality (moisture, granularity, acid value and the like) is maintenance-free in one cycle period after use, and avoid potential risks brought to the system in operation during personnel maintenance, thereby ensuring the operation safety and stability of the system, reducing the maintenance cost and having higher practical value;
(4) The invention provides a device and a method for adding micro-positive pressure water removal and acid value reduction for an anti-fuel oil tank, which can greatly relieve the degradation time of oil quality, prolong the service life of the oil product, reduce the consumption of the oil product, save energy and protect environment;
(5) The invention provides a device and a method for adding micro-positive pressure water removal and acid value reduction for a fire-resistant oil tank, wherein the introduced clean compressed air is from a product of a system of a power plant, the required air flow rate of the air is very small, no additional facilities are needed, and the investment cost is hardly increased additionally;
(6) The invention provides a device and a method for adding micro-positive pressure water removal and acid value reduction into a fire-resistant oil tank.
Drawings
Fig. 1 is a schematic structural diagram of a micro-positive pressure water removal device additionally arranged on a fire-resistant oil tank for a nuclear power station.
In the figure, 1, an isolation valve, 2, a first stop valve, 3, an oil tank inlet check valve, 4, a pressure gauge before a primary pressure reducing valve, 5, a primary pressure reducing valve, 6, a pressure gauge after the primary pressure reducing valve, 7, a particle filter, 8, a secondary pressure reducing valve, 9, a second stop valve, 10, an oil tank inlet isolation valve, 11 and a gas pressure monitoring gauge before the oil tank.
Detailed Description
The device and the method for adding micro-positive pressure water removal and acid value reduction for the anti-fuel oil tank are further described in detail below with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, a micro-positive pressure water removal device for a fire-resistant oil tank for a nuclear power station includes: DN25 compressed air pipeline, isolation valve 1, first stop valve 2, tank inlet check valve 3, primary pressure-reducing valve front pressure gauge 4, primary pressure-reducing valve 5, primary pressure-reducing valve rear pressure gauge 6, particulate filter 7, secondary pressure-reducing valve 8, second stop valve 9, tank inlet isolation valve 10, tank front gas pressure monitoring gauge 11,
the fire-resistant oil tank is connected with a DN25 compressed air pipeline, a particle filter 7 is arranged on the DN25 compressed air pipeline, and the end part of the DN25 compressed air pipeline is connected with external compressed air.
The inlet position of the fire-resistant oil tank is provided with an oil tank inlet check valve 3, the front end of the oil tank inlet check valve 3 is provided with an oil tank inlet isolation valve 10, the oil tank inlet isolation valve 10 is connected with a tee joint, the tee joint is respectively connected with a secondary pressure reducing valve 8 and a second stop valve 9, and a three-way pipeline close to the secondary pressure reducing valve 8 is provided with a front gas pressure monitoring meter 11 of the oil tank; the other end of the second-stage pressure reducing valve 8 is connected with a particle filter 7, the other end of the particle filter 7 is connected with a first-stage pressure reducing valve 5, and a pipeline is provided with a first-stage pressure reducing valve rear pressure gauge 6; the first-stage pressure reducing valve 5 is connected with a tee joint, the tee joint is respectively connected with the isolation valve 1 and the first stop valve 2, and a first-stage pressure reducing valve front pressure gauge 4 is arranged on a tee joint pipeline close to the first-stage pressure reducing valve 5.
External compressed air (0.8 MPa) is controlled to enter a system pipeline through an isolation valve 1; the pressure is reduced to 0.1MPa through a first-stage pressure reducing valve, and the quality of gas entering the fire-resistant oil tank is ensured by removing the gas or the particle impurities in the pipeline through a particle filter; the second pressure reducing valve is arranged behind the particle removing filter and used for accurately controlling the pressure (5-15 KPa) of the gas entering the oil tank, so that the fluctuation of the liquid level of the oil tank caused by the overlarge pressure of the gas at the inlet of the oil tank is prevented.
The invention provides a method for adding micro-positive pressure water removal and acid value reduction into a fire-resistant oil tank, which comprises the following steps:
step 1, purging function: the tank inlet isolation valve 10 is closed, the first stop valve 2 is closed, and the isolation valve 1 and the second stop valve 9 are opened. After compressed air is introduced into the system, the interior of a pipeline of the device is purged through the isolation valve 1, and then the gas with impurities is discharged through the second stop valve 9;
step 2, checking gas pressure: opening the isolation valve 1, closing the first shut-off valve 2, opening the second shut-off valve 9, closing the tank inlet isolation valve 10. At this time, the pressure of the primary pressure reducing valve 5 is checked firstly, and the pressure of the gas which is reduced by the primary pressure reducing valve 5 is required to be maintained at about 1bar by monitoring a pressure gauge 4 (the pressure is about 8 bar) in front of the primary pressure reducing valve and a pressure gauge 6 behind the primary pressure reducing valve; then the gas before entering the oil tank is decompressed through the secondary decompression valve 8, the gas pressure is monitored through the gas pressure monitoring meter 11 before the oil tank, and the gas pressure after being decompressed through the secondary decompression valve 8 is maintained at 5-15Kpa and can enter the oil tank; restoring the running state of the device after the adjustment is finished;
step 3, online sampling function: the second shut-off valve 9 can be used as both a purge and a device sampling port. The cleanliness of the gas entering the system can be monitored by sampling at the second stop valve 9, so that the purifying effect of the device is ensured.
Step 4, water removal function: the isolation valve 1 is opened, the tank inlet isolation valve 10 is opened, the first stop valve 2 is closed, and the second stop valve 9 is closed, so that clean compressed air is introduced into the device through the isolation valve 1 to ensure good gas phase space environment in the fire-resistant oil tank. After the compressed air is introduced into the device, the pressure of the gas entering the filter is ensured to be maintained at about 1bar after the compressed air passes through the primary pressure reducing valve 5, so that the filter 7 is prevented from being damaged due to the fact that the gas pressure is too high. The impurity content of the gas filtered by the filter 7 is kept to be less than 200ppm, and the gas pressure is maintained to be 5-15KPa after the gas passes through the secondary pressure reducing valve 8, so that the fluctuation of the oil level of the oil tank caused by the overhigh pressure is prevented, and the false alarm of the oil level of the oil tank is caused. Clean compressed air is then introduced into the system through the tank inlet isolation valve 10. By introducing micro-positive pressure gas, on one hand, the gas with higher water content in the oil tank can be discharged out of the oil tank, and on the other hand, the gas with higher external pollution degree can be prevented from entering the oil tank.
Step 5, protection function: the device is protected by the provision of a non-return valve 3. When the compressed air introduced into the external source is lost, the pressure at the outlet of the device is higher than the pressure at the inlet of the device, so as to prevent the backflow of the gas from damaging the filter. Therefore, the check valve 3 is arranged, so that the gas can be effectively prevented from flowing backwards, and the safety performance of the device is protected.
The system is to introduce compressed air after advanced treatment, the air phase space of the fire-resistant oil tank is covered by dry clean compressed air after the compressed air is filtered by a particle removal filter of the device, and then the pressure of the air in the oil tank is maintained and controlled to be kept at the micro positive pressure of 5-15kPa by a two-stage pressure reducing device. And part of gas in the box is discharged to the atmosphere through the respirator with silica gel on the oil tank, so that an air interlayer is formed on one hand, and the invasion of water vapor is avoided. On the other hand, when the phosphate ester type fire-resistant oil passes through parts such as an oil engine and the like during the operation of the unit, the oil temperature can be accelerated to rise, so that the fire-resistant oil returns to an EH oil tank, if the moisture content in the oil is higher, part of the moisture evaporates at high temperature to form water vapor, and the water vapor can be discharged to the atmosphere along with flowing compressed air gas through a respirator with silica gel on the oil tank.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art who is skilled in the art to which the present invention pertains should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof within the scope of the present invention.
Claims (1)
1. A method for adding micro-positive pressure water removal and acid value reduction to a fire-resistant oil tank is based on a method for adding micro-positive pressure water removal device to the fire-resistant oil tank for a nuclear power station, and the device comprises the following steps: the fuel resistant oil tank is connected with a DN25 compressed air pipeline, a particle filter is arranged on the DN25 compressed air pipeline, and the end part of the DN25 compressed air pipeline is connected with external compressed air; the fire-resistant oil tank further comprises an oil tank inlet check valve and an oil tank inlet isolation valve, wherein the oil tank inlet check valve is arranged at the inlet position of the fire-resistant oil tank, and the oil tank inlet isolation valve is arranged at the front end of the oil tank inlet check valve; the system also comprises a second-stage pressure reducing valve and a second stop valve, wherein the oil tank inlet isolation valve is connected with a tee joint, and the tee joint is respectively connected with the second-stage pressure reducing valve and the second stop valve; a front gas pressure monitoring meter of the oil tank is arranged on the three-way pipeline close to the secondary pressure reducing valve; the other end of the secondary pressure reducing valve is connected with a particle filter, the other end of the particle filter is connected with a primary pressure reducing valve, and a pipeline of the particle filter is provided with a primary pressure reducing valve rear pressure gauge; the first-stage pressure reducing valve is connected with a tee joint, the tee joint is respectively connected with an isolation valve and a first stop valve, and a front pressure gauge of the first-stage pressure reducing valve is arranged on a tee pipeline close to the first-stage pressure reducing valve; the method is characterized in that: the method comprises the following steps:
step 1, purging function: closing an oil tank inlet isolation valve, closing a first stop valve, and opening the isolation valve and a second stop valve;
step 2, checking gas pressure: opening an isolation valve, closing a first stop valve, opening a second stop valve and closing an oil tank inlet isolation valve, at the moment, firstly performing pressure verification on a first-stage pressure reducing valve, and monitoring a pressure gauge before the first-stage pressure reducing valve and a pressure gauge after the first-stage pressure reducing valve by monitoring, wherein the pressure of gas after being reduced by the first-stage pressure reducing valve is required to be maintained at 1bar; then the gas before entering the oil tank is decompressed through a secondary decompression valve, the gas pressure is monitored through a gas pressure monitoring meter before the oil tank, and the gas pressure after being decompressed through the secondary decompression valve is maintained at 5-15Kpa and can enter the oil tank; restoring the running state of the device after the adjustment is finished;
step 3, online sampling function: the second stop valve can be used for purging or a sampling port of the device, and the cleanliness of the gas entering the system can be monitored by sampling at the second stop valve, so that the purifying effect of the device is ensured;
step 4, water removal function: the isolation valve is opened, the oil tank inlet isolation valve is opened, the first stop valve is closed, the second stop valve is closed, clean compressed air is introduced into the device through the isolation valve to ensure good gas phase space environment in the fire-resistant oil tank, the compressed air is introduced into the device and passes through the first-stage pressure reducing valve to ensure that the gas pressure entering the filter is maintained at 1bar, the filter is prevented from being damaged due to overhigh gas pressure, the impurity content of the filtered gas is kept to be less than 200ppm after passing through the filter, the gas pressure is maintained at 5-15KPa after passing through the second-stage pressure reducing valve to prevent the fluctuation of the oil tank oil level caused by overhigh pressure, the oil tank liquid level is falsely alarmed, and clean compressed air is introduced into the system through the oil tank inlet isolation valve, and the gas with high water content in the oil tank can be discharged out of the oil tank through introducing micro-positive pressure gas, and the gas with high external pollution degree can be prevented from entering the oil tank;
step 5, protection function: the device is protected by the check valve.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011504221.4A CN114645740B (en) | 2020-12-18 | 2020-12-18 | Device and method for adding micro-positive pressure water removal and acid value reduction into anti-fuel oil tank |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011504221.4A CN114645740B (en) | 2020-12-18 | 2020-12-18 | Device and method for adding micro-positive pressure water removal and acid value reduction into anti-fuel oil tank |
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| CN114645740A CN114645740A (en) | 2022-06-21 |
| CN114645740B true CN114645740B (en) | 2023-11-14 |
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| CN115405591A (en) * | 2022-08-12 | 2022-11-29 | 华电电力科学研究院有限公司 | Dynamic control method for moisture of fire-resistant oil in power plant |
| CN115708968A (en) * | 2022-09-30 | 2023-02-24 | 中核核电运行管理有限公司 | Nuclear power plant EH oil tank water trap |
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