CN116813023A - Oil separation and drainage method for accident oil pool - Google Patents
Oil separation and drainage method for accident oil pool Download PDFInfo
- Publication number
- CN116813023A CN116813023A CN202310927768.2A CN202310927768A CN116813023A CN 116813023 A CN116813023 A CN 116813023A CN 202310927768 A CN202310927768 A CN 202310927768A CN 116813023 A CN116813023 A CN 116813023A
- Authority
- CN
- China
- Prior art keywords
- oil
- drainage
- liquid level
- water
- pool
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000000926 separation method Methods 0.000 title abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 160
- 239000007788 liquid Substances 0.000 claims abstract description 128
- 238000009434 installation Methods 0.000 claims 1
- 239000007921 spray Substances 0.000 abstract description 12
- 238000010276 construction Methods 0.000 abstract description 2
- 235000019198 oils Nutrition 0.000 description 252
- 235000019476 oil-water mixture Nutrition 0.000 description 6
- 238000005507 spraying Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000002351 wastewater Substances 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Housings And Mounting Of Transformers (AREA)
Abstract
An oil separating and draining method for an accident oil pool is characterized in that the height of an oil layer in the oil pool is determined, and then the oil-water liquid level difference is determined according to the oil and water density; then, by determining the drainage pressure drop, setting a first liquid level in the oil pool and setting a second liquid level so that the second liquid level is lower than the first liquid level; determining a final oil level by the second liquid level and the oil-water level difference, so that the final oil level is positioned between the second liquid level and the first liquid level; and finally, installing the drainage facility in the oil pool according to the setting positions of the first liquid level and the second liquid level. The oil separation and drainage method for the accident oil pool can dynamically increase the oil storage capacity of the accident oil pool, prevent the insulating oil and water spray water in the main transformer body from entering the accident oil pool in a large amount to cause oil overflow when the main transformer is in fire, further prevent the accident from expanding, avoid causing property loss and facilitate construction.
Description
Technical Field
The invention relates to the technical field of electric power facility maintenance, in particular to an oil removal and drainage method for an accident oil pool.
Background
At present, in the existing large and medium-sized hydropower stations, thermal power stations, wind power stations and substations, an oil accident oil pool is generally arranged for a main transformer of the large and medium-sized hydropower stations, thermal power stations and wind power stations, and the accident oil pool is mainly used for collecting waste oil removed when the transformer fails, wherein the volume of the accident oil pool is the total oil quantity of the main transformer plus the water quantity of water spraying for 0.4 hour. The design of the accident oil pool is different according to the arrangement mode (indoor arrangement and outdoor arrangement) of the main transformer and the fire-fighting mode (whether a water spray fire-extinguishing system is arranged or not) adopted by the main transformer. The main transformer is provided with an accident oil pool of the water spray fire extinguishing system, and no matter the main transformer adopts a user or outdoor arrangement mode, the accident oil pool is provided with an oil separation and drainage facility. For the main transformer which is arranged indoors and is not provided with a water spraying system, an accident oil tank can be provided with no oil separation drainage facility. However, for the main transformer arranged outdoors, no matter whether a water spray fire extinguishing system is arranged or not, the accident oil pool is provided with an oil separation and drainage facility.
The Chinese patent application No. 202211395653.5 discloses an automatic draining device for a transformer accident oil pool, wherein a low water level sensor is arranged above the bottom of the transformer accident oil pool, and a high water level sensor is arranged below a water pump water outlet. The low water level sensor and the high water level sensor are electrically connected to a water pump automatic controller, and the water pump automatic controller is connected to a drainage pump arranged in the transformer accident oil pool through a switch of a control power supply. This drainage device is the transformer that outdoor setting was aimed at, and the condition of rainwater was collected to its accident oil pool, and the rainwater of collecting in the accident oil pool is cleared up automatically through this drainage device. The water draining device does not consider how the high water level sensor and the low water level sensor are determined, meanwhile, the water draining device does not consider whether the transformer is provided with a water spray fire extinguishing system or not, and when the transformer has an accident, workers are required to confirm on site that a fire disaster is extinguished after the water spray system is automatically started and then stop manually, if the workers fail to close the water spray system in time, insulating oil of the main transformer and water sprayed water are mixed and flow into an accident oil pool in the process, and the liquid level is caused to rise temporarily. When a large amount of oil-water mixed liquid enters the accident oil pool, the accident oil pool is easy to be filled with the oil-water mixed liquid, and oil overflows from the accident oil pool.
The Chinese patent application No. 202211034165.1 discloses a transformer accident drainage device for a non-wastewater treatment system project, a first pipeline for communicating a transformer accident oil pool with a rainwater pipe network drainage pipeline and a second pipeline for communicating the transformer accident oil pool with a storage pool, wherein at least one valve is respectively arranged on the first pipeline and the second pipeline; the first pipeline is used for connecting rainwater received by the transformer accident oil pool to a factory rainwater pipe network discharge pipeline under the non-transformer accident operation working condition, and the second pipeline is used for discharging oil-containing wastewater to the storage pool under the transformer accident oil discharge working condition.
The invention also discloses a transformer accident drainage method for the project without wastewater treatment system, which comprises the following steps: under the non-accident working condition of the transformer, the valve on the second pipeline is in a closed state, the valve on the first pipeline is in a normally open state, and the transformer accident oil pool is discharged by free gravity from the rainwater collected by the transformer oil collecting pit under the rainy state, so that the transformer accident oil pool is automatically replenished with water; and under the transformer accident oil discharge state, closing a valve on the first pipeline, opening a valve on the second pipeline, and carrying out outward transportation on the transformer accident oil collected by the accident oil pool and the oily wastewater of the storage pool. This method does not take into account the fact that the water spray system automatically forgets to turn off thereafter when an accident occurs in the transformer. When a large amount of oil-water mixed liquid enters the accident oil pool, the inflow flow of the mixed liquid is larger than the drainage flow, so that the accident oil pool is easily filled with the oil-water mixed liquid, and oil overflows from the accident oil pool.
In summary, the accident oil pool oil removal drainage facility of the main transformer at present has the following problems: after the main transformer water spray system is automatically started, if the water spray system is not closed in time, a large amount of mixed liquid of water sprayed by water and oil flows into an accident oil pool, so that the liquid level in the oil pool is increased, and when the inflow flow of the mixed liquid is larger than the drainage flow, the oil is easy to overflow from the top of the oil pool.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the present invention is to provide an oil removal and drainage method for an accident oil pool, which makes the insulating oil drained into the accident oil pool by a main transformer remain in the accident oil pool, so as to avoid the insulating oil overflowing the oil pool after the main transformer is in fire.
The invention provides an oil removal and drainage method for an oil tank, which comprises the following steps:
determining the height stage of an oil layer, and determining the effective bottom area of an oil pool according to the arrangement position of the oil pool and the drainage mode; then, according to the effective area of the oil pool and the volume of the main transformer oil, the height of an oil layer in the oil pool is obtained;
determining an oil-water level difference stage, and calculating the final oil level and the final water level difference in the oil pool according to the oil and water densities and the oil layer height;
setting a first liquid level stage, and determining the drainage pressure drop of a main transformer according to the inner diameter of a drainage pipe of a given main transformer oil collecting pit connected with the oil pool; or determining the drainage pressure drop of the main transformer to obtain the inner diameter of the liquid discharge pipe; according to the drainage pressure drop, setting the first liquid level in the oil tank, wherein the difference between the elevation of the main transformer and the elevation of the first liquid level is not smaller than the drainage pressure drop;
setting a second liquid level stage, wherein the second liquid level is set in the oil pool and is lower than the first liquid level;
setting a final oil level stage, namely setting the final oil level in the oil tank according to the first liquid level, the second liquid level and the oil-water liquid level difference, wherein the final oil level is positioned between the second liquid level and the first liquid level;
and a stage of installing drainage facilities, wherein the drainage facilities are installed in the oil pool according to the setting positions of the first liquid level and the second liquid level.
Preferably, after the oil-water level difference is determined, the height between the water inlet of the drainage facility and the inner bottom surface of the oil pool is set so as to ensure that the water inlet smoothly enters water.
Preferably, after determining the height of the water inlet of the drainage facility, the height of the oil-water interface is set to avoid oil in the reservoir from entering the water inlet.
Preferably, in the stage of determining the reservoir height, the specific steps include:
the drainage mode comprises a self-flow drainage mode, and according to the self-flow drainage mode, the effective bottom area of the oil pool is determined to be about the inner bottom area of the oil pool; and then obtaining the height of the oil layer in the oil pool according to the volume of the main transformer oil.
Preferably, in the stage of determining the reservoir height, the specific steps include:
the drainage mode further comprises a water pump drainage mode, a drainage well is arranged in the oil pool corresponding to the water pump drainage mode, and the effective bottom area of the oil pool is obtained by subtracting the area of the outer bottom of the drainage well from the inner bottom area of the oil pool; and obtaining the height of the oil layer in the oil pool according to the volume of the main transformer oil.
Preferably, at the stage of installing the drainage facility, the specific steps include:
the drainage facility comprises a first drainage pipe and a second drainage pipe, the first drainage pipe is vertically arranged in the oil pool, and one end of the first drainage pipe penetrates through the top of the oil pool; the second drain pipe is vertically fixed on the first drain pipe along the position of the second liquid level.
Preferably, at the stage of installing the drainage facility, the specific steps include: the drainage facility further comprises a third drainage pipe and a water pump, the water pump is arranged at the bottom of the drainage well, one end of the third drainage pipe is connected with the water pump, and the other end of the third drainage pipe penetrates to the top of the oil pool; and setting a pump starting water level at a position corresponding to the first liquid level of the third drain pipe, and setting a pump stopping water level at a position corresponding to the second liquid level of the third drain pipe.
As described above, the oil removal and drainage method for the accident oil pool provided by the invention has the following technical effects:
the invention determines the height of the oil layer in the accident oil pool, and then determines the oil-water liquid level difference according to the oil and water density. And then, setting a first liquid level in the oil pool by determining the drainage pressure drop, and setting a second liquid level so that the second liquid level is lower than the first liquid level. And determining the final oil level through the second liquid level and the oil-water liquid level difference, so that the final oil level is positioned between the second liquid level and the first liquid level. And finally, installing the drainage facility in the oil pool according to the setting positions of the first liquid level and the second liquid level. The oil separation and drainage method for the accident oil pool can dynamically increase the oil storage capacity of the accident oil pool, prevent the insulating oil and water spray water in the main transformer body from entering the accident oil pool in a large amount to cause oil overflow when the main transformer is in fire, further prevent the accident from expanding, avoid causing property loss and facilitate construction.
Drawings
Fig. 1 is a schematic view of an oil removal and drainage facility for an accident oil pool according to an embodiment of the present invention.
Fig. 2 is a top view of an accident oil pool oil removal and drainage facility according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of an oil removal and drainage facility for an accident oil pool according to a second embodiment of the present invention.
Fig. 4 is a top view of an accident oil pool oil removal and drainage facility according to a second embodiment of the present invention.
Reference numerals illustrate:
100. an oil pool; 110. a liquid discharge pipe; 111. main transformer ground elevation; 120. a first drain pipe; 130. a second drain pipe; 140. a water pump; 150. a third drain pipe; 200. oil collecting pit of main transformer; 300. water; 310. an oil-water interface; 320. a first liquid level; 330. a second liquid level; 340. final water level; 400. an oil; 410. final oil level; 500. a drainage well; 510. and a water inlet.
Detailed Description
Further advantages and effects of the present invention will become apparent to those skilled in the art from the disclosure of the present invention, which is described by the following specific examples.
It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the invention to the extent that it can be practiced, since modifications, changes in the proportions, or otherwise, used in the practice of the invention, are not intended to be critical to the essential characteristics of the invention, but are intended to fall within the spirit and scope of the invention. Also, the terms such as "upper", "lower", "left", "right", "middle", and the like are used herein for descriptive purposes only and are not intended to limit the scope of the invention for which the invention may be practiced or for which the relative relationships may be altered or modified without materially altering the technical context.
Example 1
Referring to fig. 1 to 2, an embodiment of an oil sump oil removal drainage method includes the steps of:
and determining the height H3 of the oil layer, wherein the length and the width of the inner dimension of the accident oil pool are 3m according to the arrangement position of the oil pool 100. The oil pool 100 uses gravity drainage because the condition of gravity drainage is provided according to the actual situation. Since the drain water inlet is negligible for the oil pool 100 area, the effective area of the oil pool 100 is 3m3m=9m 2 . Then, it was determined that the volume of the insulating oil in the main transformer was about 27m 3 Calculating the oil layer height H3:the resulting oil layer in the oil pool 100 had a height of 3m.
Determining an oil-water level difference delta H stage, and calculating final oil level and final water level differences delta H, rho in an oil pool according to the oil and water density and the oil layer height H3 and Bernoulli equation oil gh oil ＝ρ water gh water ，h water ＝h oil ΔH, where ρ oil Is the density of the oil (kg/m) 3 ) The main transformer insulation oil density is preferably 895kg/m 3 ；ρ water Is the density of water (kg/m) 3 ) 1000kg/m can be taken 3 。
I.e.The oil-water level difference DeltaH is 0.352m.
After the oil-water level difference Δh is determined, the height H5 between the water inlet 510 of the drainage facility and the inner bottom surface of the oil pool 100 is set to ensure that the water inlet 510 smoothly enters water, and the height H5 between the water outlet 510 and the bottom surface of the oil pool 100 is preferably 250mm.
After the height of the drain inlet 510 is determined, the height H4 of the oil-water interface is set to avoid that the oil 400 in the oil layer in the oil sump 100 enters the inlet 510, H4 is preferably 600mm.
In the stage of setting the first liquid level 320, the outlet of the liquid discharge pipe 110 of the main transformer oil sump 200 is provided with a sufficient liquid level difference (water head), namely, the height difference between the ground height 111 of the main transformer and the first liquid level 320 in the oil sump 100, and the height difference between the ground height 111 of the main transformer and the first liquid level 320 is not smaller than the drainage pressure drop delta H1, so as to ensure that the oil-water mixture in the main transformer oil sump 200 is smoothly discharged into the accident oil sump 100. Measuring the inner diameter D1 of the drain pipe 110 of the main transformer oil collecting pit 200 connected with the oil pool 100, and determining the drain pressure drop delta H1 of the main transformer; alternatively, the drain pressure drop ΔH2 is measured to determine the inside diameter D1 of the drain pipe (110). Specifically, the drainage pressure drop Δh1 is calculated from the along-path head loss equation:
wherein lambda is the coefficient of the loss of resistance along the way; Σζ is the sum of the local drag loss coefficients; l is the distance (m) between the outlet of the oil sump drain pipe of the farthest main transformer and the inlet of the oil sump drain pipe; d1 is the inner diameter of the liquid discharge pipe; q is the flow (m) in the liquid discharge pipe 3 /s). It should be noted that, in the formula, only the drainage pressure drop Δh1 and the inner diameter D1 of the drain pipe 110 are unknown, and one of the drainage pressure drop Δh1 and the inner diameter D1 of the drain pipe 110 is known, so that the other parameter can be obtained.
Further, L is preferably 100m, the inner diameter D1 of the drain is preferably 0.30m, and the flow rate Q in the drain is preferably 0.06m 3 The linear head loss coefficient lambda is 0.025 and the total local resistance loss coefficient sigma zeta is 3.5
From the drain pressure drop Δh1, a first liquid level 320, i.e., l2=l1- Δh1, is obtained, where L2 is the first liquid level; l1 is the main transformer ground elevation 111 (the elevation can be set according to specific engineering conditions), and L1 is preferably 580m; l2 is 579.565m.
Further, the first liquid level 320 is set in the oil sump 100, so that the flow rate of the liquid entering the oil sump is equal to the flow rate of the liquid discharged from the oil sump, and the first liquid level 320 is higher than the outlet of the liquid discharge pipe 110 of the main transformer oil sump 200, so as to ensure that the outlet of the liquid discharge pipe 110 of the main transformer oil sump 200 has a sufficient liquid level difference.
After determining the first liquid level 320, a distance H1 between the inner top surface of the oil sump 100 and the first liquid level 320, i.e. h1=Δh1-d, is determined, where d is the thickness of the top plate concrete of the oil sump 100, preferably 0.25m, and h1=0.185 m, where the determination of H1 ensures that a large amount of the oil-water mixture is discharged into the oil sump 100, and that the liquid level exceeds the first liquid level, leaving a headspace, prevents the oil 400 from overflowing the oil sump 100. It should be noted that, when the main transformer is on fire, the water spraying system is automatically started, the insulating oil 400 of the main transformer is discharged into the oil sump of the main transformer, and the mixed liquid of the insulating oil in the oil sump 200 of the main transformer and the water 300 sprayed by the water is discharged into the oil sump 100 in a large amount, which easily causes the total level of the oil and the water in the oil sump 100 to temporarily rise. When the mixed liquor reaches the first liquid level, the flow rate of the oil-water mixed liquor discharged into the oil pool 100 is equal to the flow rate of the water discharged out of the oil pool 100.
A second level 330 stage is provided, the second level 330 shown being provided in the oil sump 100, the second level 330 being lower than the first level 320. The determination of the second liquid level 330 has a direct effect on the pipe diameter of the drain pipe and the depth of the oil sump 100, the second liquid level 330 preferably being 578.5m.
After the first liquid level 320 and the second liquid level 330 are determined, the drain pipe inlet and outlet pressure difference delta H2 in the drain facility of the oil pool 100 is determined, and the drain pipe diameter D2 of the oil pool 100 is determined according to the drain pipe inlet and outlet pressure difference delta H2; i.e. Δh2=l2-L5.
Wherein: l2 is a first liquid level; l5 is the second liquid level. According to the above calculation, the first liquid level is 579.565m and the second liquid level is 578.5m, Δh2=l2-l5=1.065 m. The distance La from the water inlet to the water outlet of the drain pipe is preferably 50m, and the drainage flow Q is 0.06m 3 The along-line head loss coefficient λ=0.025, the total local head loss coefficient Σζ=2.5, passing along the edgeThe program head loss formula calculates D2,
the minimum inner diameter of the drain pipe can be obtained through calculation, the inner diameter D2 of the drain pipe is optimized, and after optimization, the D2 is preferably 0.25m.
Setting a final oil level 410, setting a final oil level 410 in the oil sump according to the first liquid level 320, the second liquid level 330 and the oil-water level difference delta H, wherein the final oil level 410 is located between the second liquid level 330 and the first liquid level 320. Further, the distance H2 between the final oil level 410 and the first liquid level 320 is determined, i.e. h2=Δh2+0.5D2- Δh=0.838 m. According to the calculation result of H2, the final oil level 410 can be determined, the final oil level 410 is combined with the oil-water level difference delta H to determine the final water level 340, and the final water level 340 and the lower pipe wall at the outlet of the drain pipe have the same height. When the flow rate of the oil-water mixture discharged into the oil sump 100 is smaller than the flow rate of the drain pipe discharge water, the liquid level gradually drops, and the overall liquid level drops to a final oil level 410, wherein the water level in the drain pipe is at a final water level 340.
And a stage of installing the drainage facility, wherein the drainage facility is installed in the oil sump 100 according to the setting positions of the first liquid level 320 and the second liquid level 330.
Further, the drainage facility includes a first drain pipe 120 and a second drain pipe 130, the first drain pipe 120 is vertically disposed in the oil pool 100, and one end of the first drain pipe 120 passes through the top of the oil pool 100; the second drain pipe 130 is vertically fixed to the first drain pipe 120 along the position of the second liquid level 330, and the second drain pipe 120 penetrates through the wall of the oil pool 100. Further, the second drain pipe 130 axis centerline coincides with the second liquid level 330.
In use, when a large amount of the oil-water mixture is discharged into the sump 100, water below the oil-water interface 310 rises through the first drain 120 until the water level reaches the first level 320. At this time, the drainage flow of the second drain pipe 120 is the same as the drainage flow of the drainage pipe into the oil pool, so that the whole oil-water level is prevented from exceeding the first level 320, and the insulating oil in the oil pool 100 is prevented from overflowing the oil pool. When the drain flow rate discharged into the oil pool is smaller than the drain flow rate, the water level in the first drain pipe 120 is gradually reduced until the water level is reduced to the same height as the lower pipe wall of the second drain pipe 120 (i.e., the final water level), and the drain is stopped.
Example two
Referring to fig. 3 to 4, the second embodiment is substantially the same as the first embodiment, and differs as follows:
in the stage of determining the height H3 of the oil layer, the length and the width of the inner dimension of the accident oil pool are 3.5m, the drainage well 500 is arranged in the oil pool 100, and the length and the width of the outer dimension of the drainage well are 1m. Therefore, the oil sump 100 is drained by a water pump.
Since the drain pipe diameter is too small for the oil pool 100 area, which is negligible, the effective planar area of the oil pool 100 is 3.5m×3.5m-1m×1 m=11.25 m 2 . Then, it was determined that the volume of the insulating oil in the main transformer was about 27m 3 Calculating the oil layer height H3:the resulting oil layer height H3 in the oil pool 100 was 2.4m.
And determining the oil-water liquid level difference delta H, and calculating the oil-water liquid level difference delta H in the oil pool according to the Bernoulli equation according to the oil, water and oil density and the oil layer height H3, wherein the specific formula is shown in the first embodiment, and the delta H is 0.282m.
According to the method of the first embodiment, the height H5 of the drain inlet 510 from the ground in the oil pool 100 is preferably 250mm, and the oil-water interface H4 is preferably 600mm. The first level was determined to be 579.565m, the second level was determined to be 578.5m, and the distance H1 between the top surface of the interior of the oil pool 100 and the first level 320 was determined to be 0.185m.
Further, the first liquid level 320 is set as the water pump starting water level, when the main transformer is in fire, the water spraying system is automatically started, the insulating oil 400 of the main transformer is discharged into the oil collecting pit of the main transformer, and a large amount of mixed liquid of the insulating oil in the oil collecting pit 200 of the main transformer and the water 300 sprayed by the water is discharged into the oil sump 100, so that the total liquid level of the oil and the water in the oil sump 100 is easily increased temporarily. When the mixed liquid reaches the first liquid level, the water pump starts to work, so that the flow rate of the oil-water mixed liquid discharged into the oil pool 100 is equal to the flow rate of the water discharged out of the oil pool 100. Further, the second liquid level 330 is set to a pump-off level.
Setting the final oil level 410, determining the distance H2 between the final oil level 410 and the first liquid level 320, i.e. h2=l2-l5—Δh=0.783m, and determining the final oil level 410 according to the calculation result of H2, wherein the final oil level 410 and the oil-water level difference Δh determine the final water level 340. When the flow rate of the oil-water mixture discharged into the oil sump 100 is smaller than the drain discharge flow rate, the oil level in the oil sump 100 gradually decreases from the first level 320 to the final oil level 410, wherein the water level in the drain well 500 is at the pump-down level.
As shown in fig. 3, in the stage of installing the drainage facility, the drainage facility further comprises a third drain pipe 150 and a water pump 140, the water pump 140 is arranged at the bottom of the drainage well 500, the drainage well 500 is provided with a water inlet 510, one end of the third drain pipe 150 is connected with the water pump 140, and the other end of the third drain pipe 150 penetrates to the top of the oil pool 100; and then the third drain pipe 150 is provided with a pump starting water level at a position corresponding to the first liquid level 320, and the third drain pipe 150 is provided with a pump stopping water level at a position corresponding to the second liquid level 330.
When the oil-water mixture is discharged into the oil pool 100 in large quantity, water 300 below the oil-water interface 310 enters the drainage well 500 through the water inlet 510 until the water level reaches the first level 320 (i.e. the pump starting level), and the water pump 140 starts to work, at this time, the drainage flow of the drain pipe at the pump starting level is the same as the drainage flow of the drain pipe discharged into the oil pool. When the drain flow rate into the sump is less than the drain flow rate, the water level in the drain well 500 is gradually reduced until the water pump stops working and stops draining when the water level drops to the second level 330 (i.e., the pump-off level).
Further, the drain pump is selected according to the drain flow of the main transformer oil sump 200, and the drain pump flow is larger than the inlet flow of the oil sump, i.e. the preferred flow is not smaller than q=0.06 m 3 /s＝216m 3 Water pump/h.
In summary, the invention determines the height of the oil layer in the accident oil pool, and then determines the oil-water level difference according to the oil and water densities. Then, a first liquid level is set in the oil pool by determining the drainage pressure drop; setting a second liquid level, so that the second liquid level is lower than the first liquid level; determining a final oil level by the second liquid level and the oil-water level difference, so that the final oil level is positioned between the second liquid level and the first liquid level; and finally, installing the drainage facility in the oil pool according to the setting positions of the first liquid level and the second liquid level. The oil separation and drainage method for the accident oil pool can dynamically increase the oil storage capacity of the accident oil pool, prevent the insulating oil and water spray water in the main transformer body from entering the accident oil pool in a large amount to cause oil overflow when the main transformer is in fire, further prevent the accident from expanding, avoid causing property loss, and basically avoid increasing engineering investment.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.
Claims (7)
1. An oil removal and drainage method for an accident oil pool is characterized by comprising the following steps:
determining the oil level height stage, and determining the effective bottom area of the oil pool (100) according to the arrangement position and the drainage mode of the oil pool (100); then, according to the effective bottom area of the oil pool (100) and the volume of main transformer oil, the height of an oil layer in the oil pool (100) is obtained;
determining an oil-water level difference stage, and calculating a final oil level and a final water level difference in the oil pool according to the densities of oil (300) and water (400) and the oil layer height;
a first liquid level (320) setting stage, wherein the drainage pressure drop of the main transformer is determined according to the inner diameter of a drain pipe (110) of a given main transformer oil collecting pit (200) connected with the oil sump (100); alternatively, determining the drain pressure drop to obtain the drain pipe (110) inner diameter; setting the first liquid level (320) in the oil tank (100) according to the drain pressure drop, wherein the difference between the main transformer ground elevation (111) and the first liquid level (320) is not smaller than the drain pressure drop;
-a second liquid level (330) stage, wherein said second liquid level (330) is set in said oil sump, said second liquid level (330) being lower than said first liquid level (320);
a final oil level (410) setting stage, wherein a final oil level (410) in the oil sump is set according to a first liquid level (320), the second liquid level (330) and the oil-water level difference, and the final oil level (410) is located between the second liquid level (330) and the first liquid level (320);
and a stage of installing drainage facilities, wherein the drainage facilities are installed in the oil pool (100) according to the setting positions of the first liquid level (320) and the second liquid level (330).
2. The method for oil removal and drainage of an accident oil sump according to claim 1, wherein after the oil-water level difference is determined, the height of the water inlet (510) of the drainage facility and the inner bottom surface of the oil sump (100) is set so as to ensure smooth water intake of the water inlet (510).
3. The method of oil removal and drainage of an accident oil pool according to claim 2, wherein after determining the height of the water inlet (510) of the drainage facility, the height of the oil-water interface (310) is set to avoid oil (400) in the oil layer from entering the water inlet (510).
4. The method for oil removal and drainage of an accident oil pool according to claim 2, wherein the specific steps include, in the stage of determining the height of the oil layer:
the drainage mode comprises a self-flow drainage mode, and according to the self-flow drainage mode, the effective bottom area of the oil pool (100) is determined to be about the inner bottom area of the oil pool (100); and then obtaining the height of the oil layer in the oil tank (100) according to the volume of the main transformer oil.
5. The method for oil removal and drainage of an accident oil pool according to claim 2, wherein the specific steps include, in the stage of determining the height of the oil layer:
the drainage mode further comprises a water pump drainage mode, a drainage well (500) is arranged in the oil pool corresponding to the water pump drainage mode, and the effective bottom area of the oil pool is obtained by subtracting the area of the outer bottom of the drainage well (500) from the inner bottom area of the oil pool; and obtaining the height of the oil layer in the oil tank (100) according to the volume of the main transformer oil.
6. The method for oil removal and drainage of an accident oil pool according to claim 4, wherein the specific steps include, at the stage of installing the drainage facility:
the drainage facility comprises a first drainage pipe (120) and a second drainage pipe (130), wherein the first drainage pipe (120) is vertically arranged in the oil pool (100), and one end of the first drainage pipe (120) penetrates through the top of the oil pool (100); the second drain pipe (130) is vertically fixed on the first drain pipe (120) along the position of the second liquid level (330).
7. The method for oil removal and drainage of an accident oil pool according to claim 5, wherein the specific steps in the installation and drainage setting stage include:
the drainage facility further comprises a third drainage pipe (150) and a water pump (140), the water pump (140) is arranged at the bottom of the drainage well (500), one end of the third drainage pipe (150) is connected with the water pump (140), and the other end of the third drainage pipe (150) penetrates to the top of the oil pool (100); and then the third drain pipe (150) is provided with a pump starting water level at a position corresponding to the first liquid level (320), and the third drain pipe (150) is provided with a pump stopping water level at a position corresponding to the second liquid level (330).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310927768.2A CN116813023A (en) | 2023-07-26 | 2023-07-26 | Oil separation and drainage method for accident oil pool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310927768.2A CN116813023A (en) | 2023-07-26 | 2023-07-26 | Oil separation and drainage method for accident oil pool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116813023A true CN116813023A (en) | 2023-09-29 |
Family
ID=88116818
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310927768.2A Pending CN116813023A (en) | 2023-07-26 | 2023-07-26 | Oil separation and drainage method for accident oil pool |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116813023A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108483570A (en) * | 2018-06-04 | 2018-09-04 | 中国电建集团华东勘测设计研究院有限公司 | Oil water separator for marine wind electric field |
| CN217437820U (en) * | 2022-07-01 | 2022-09-16 | 中国电力工程顾问集团东北电力设计院有限公司 | Novel accident oil pool |
| CN115354727A (en) * | 2022-08-26 | 2022-11-18 | 山东电力工程咨询院有限公司 | Transformer accident drainage device and method for project without wastewater treatment system |
| CN115539365A (en) * | 2022-11-09 | 2022-12-30 | 国网福建省电力有限公司 | Automatic drainage device for transformer accident oil pool |
-
2023
- 2023-07-26 CN CN202310927768.2A patent/CN116813023A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108483570A (en) * | 2018-06-04 | 2018-09-04 | 中国电建集团华东勘测设计研究院有限公司 | Oil water separator for marine wind electric field |
| CN217437820U (en) * | 2022-07-01 | 2022-09-16 | 中国电力工程顾问集团东北电力设计院有限公司 | Novel accident oil pool |
| CN115354727A (en) * | 2022-08-26 | 2022-11-18 | 山东电力工程咨询院有限公司 | Transformer accident drainage device and method for project without wastewater treatment system |
| CN115539365A (en) * | 2022-11-09 | 2022-12-30 | 国网福建省电力有限公司 | Automatic drainage device for transformer accident oil pool |
Non-Patent Citations (1)
| Title |
|---|
| 赵世海: "管腔式变压器事故油池设计", 水利水电快报, vol. 42, no. 8, 31 August 2021 (2021-08-31), pages 44 - 47 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN212730787U (en) | Indoor fire-fighting automatic water-spraying fire-extinguishing system | |
| CN209837172U (en) | Underground double-layer fire pool for building engineering | |
| CN110965627A (en) | Automatic siphon drainage device | |
| CN212651391U (en) | Integrated form is from arranging accident oil bath | |
| CN116813023A (en) | Oil separation and drainage method for accident oil pool | |
| US10555463B2 (en) | Method for maintaining soil moisture for a garden via a sump pump | |
| CN208718032U (en) | A kind of transformer fire drainage system waterproof body pollution discharge equipment | |
| CN215166103U (en) | Anti-overflow automatic control early warning device for water tank | |
| WO2011030180A1 (en) | Rainwater collection and dispensation system | |
| CN202920861U (en) | Automatic shutdown oil house during enemy bombing | |
| AU2002311399B2 (en) | High voltage power transformer oil spill fire extinguishment and drainage | |
| CN203701210U (en) | Automatic water drainage device for recycle water collection pool | |
| CN213014574U (en) | Transformer accident oil pool system with automatic drainage function | |
| CN105821954A (en) | LNG accumulated water separation and discharge pool | |
| CN205683652U (en) | A kind of buried electric substation transformer oil water separating tank | |
| CN106869236B (en) | Horizontal storage tank for sponge urban rainwater collection system and construction method of horizontal storage tank | |
| CN211571936U (en) | Bury formula integration fire pump station | |
| CN203420315U (en) | Household water supply device | |
| CN203916154U (en) | Auto-drainage environmental protection accident oil storage containing siphon termination mechanism | |
| CN208561777U (en) | Oil water separator for marine wind electric field | |
| CN218458713U (en) | Accident oil pool of booster station | |
| SU1335638A1 (en) | Drainage manifold mouth | |
| CN204922175U (en) | Floater formula drain | |
| CN101656138B (en) | Emergency oil pond with oil-water separation device | |
| CN211172306U (en) | Initial rainwater discarding device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |