CN114989859A - Apparatus and method for dewatering crude oil containing water - Google Patents
Apparatus and method for dewatering crude oil containing water Download PDFInfo
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- CN114989859A CN114989859A CN202210479526.7A CN202210479526A CN114989859A CN 114989859 A CN114989859 A CN 114989859A CN 202210479526 A CN202210479526 A CN 202210479526A CN 114989859 A CN114989859 A CN 114989859A
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- 239000010779 crude oil Substances 0.000 title claims abstract description 84
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 56
- 230000018044 dehydration Effects 0.000 claims abstract description 55
- 230000005684 electric field Effects 0.000 claims abstract description 47
- 208000005156 Dehydration Diseases 0.000 claims description 55
- 239000003921 oil Substances 0.000 claims description 39
- 230000008569 process Effects 0.000 claims description 12
- 238000009826 distribution Methods 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 10
- 239000004812 Fluorinated ethylene propylene Substances 0.000 claims description 4
- HQQADJVZYDDRJT-UHFFFAOYSA-N ethene;prop-1-ene Chemical group C=C.CC=C HQQADJVZYDDRJT-UHFFFAOYSA-N 0.000 claims description 4
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- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 3
- 239000005341 toughened glass Substances 0.000 claims description 3
- -1 polytetrafluoroethylene Polymers 0.000 claims description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G33/00—Dewatering or demulsification of hydrocarbon oils
- C10G33/02—Dewatering or demulsification of hydrocarbon oils with electrical or magnetic means
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- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
- Electrostatic Separation (AREA)
Abstract
The invention relates to the field of petrochemical equipment, and provides a device and a method for dehydrating water-containing crude oil, wherein the device comprises a tank body, an electric field generation assembly and a feeding distributor; the electric field generating assembly comprises a plurality of groups of grounding pole rod groups and a plurality of groups of positive pole rod groups; the multiple groups of grounding pole rod groups and the multiple groups of positive pole rod groups are alternately arranged at intervals between one group of grounding pole rod groups and one group of positive pole rod groups, and the adjacent grounding pole rod groups and the positive pole rod groups are vertically opposite; each group of the grounding electrode rod groups comprises a plurality of grounding electrode rods, and each group of the positive electrode rod groups comprises a plurality of positive electrode rods which are in one-to-one correspondence with the plurality of grounding electrode rods; every earth electrode stick is the conducting electrode stick, and every anodal stick all includes utmost point stick body and cladding in the insulating layer of utmost point stick body lower part outer wall, and the utmost point stick body is the conducting electrode stick. The method comprises the step of dehydrating by adopting the device. The device has a simple structure, can reduce the running current, effectively solves the problem of high current on the polar plate, avoids the electric field intensity reduction or short circuit caused by large current, and has high dehydration efficiency.
Description
Technical Field
The invention relates to the field of petrochemical equipment, in particular to a device and a method for dehydrating water-containing crude oil.
Background
With the entering of most oil fields in China into the third extraction stage, the water content of the produced liquid continuously rises to 99 percent at most. The total crude oil yield of a plurality of large oil fields in the east of China is about 70 percent of the total national yield, and the comprehensive water content is over 80 percent. According to the national standard, the water content of the commercial crude oil is required to be less than 0.5%, and the water content of the heavy oil is required to be less than 2%. Therefore, the effective reduction of the water content of crude oil by treating the crude oil containing water is a very important link in the industrial production process.
At present, the production flow of the oil field is as follows: the produced crude oil firstly enters a first-stage three-phase separator for oil-gas-water separation, most of water in the crude oil is separated out, and then the crude oil enters a second-stage separator (or a settling tank) for further separation, wherein the water content of the separated crude oil is less than 30%; heating the crude oil, then feeding the crude oil into an electric dehydration tank, and removing water in the crude oil to the technical index of the commercial crude oil under the action of an electric field and a demulsifier. The separation method has the advantages of complex process, large volume of required equipment and high investment, particularly, the water content of the crude oil produced is high when the oil field enters a three-extraction period, and the water content of the crude oil is often higher than 30 percent after passing through the two-stage separator, so that the phenomenon of short circuit can be caused when the crude oil enters the electric dehydration tank, and the problems of unstable dehydration electric field, high energy consumption of an electric dehydration system, low dehydration efficiency and the like are caused.
In the existing crude oil electric dehydration technology, the dehydration treatment aiming at crude oil is mostly completed by improving process conditions and designing and modifying an electric dehydration device. The invention patent CN107245348A discloses a process flow improvement scheme for treating oilfield produced fluid, which comprises the steps of firstly, feeding crude oil produced fluid and a demulsifier into liquid separation equipment to obtain low-water-content crude oil. Heating the low water content crude oil, mixing with a demulsifier, feeding into a primary settling tank, feeding into a buffer tank, further heating, feeding into an electric dehydration device, feeding the dehydrated oil phase into a purification tank, and finally obtaining the purified crude oil with the water content of less than 1.5%. Although the process can effectively dehydrate the crude oil with high water content, the process is complex, more equipment is adopted, the occupied area is large, and the problem of higher cost is caused.
The invention patent CN108942223A develops a high-efficiency electric dehydration device, a structure that a suspension needle grounding electrode vertically penetrates through an electrode inner flow channel is used, the electrode spacing is reduced, an electric field with the same strength can be generated when the output voltage is smaller, meanwhile, a reciprocating piston pump is arranged on an oil inlet pipe, the motion of water drops in the flow field is periodically changed by periodic pumping, the water drops are coalesced by drag force and inertia, the settlement of charged water drops is accelerated, and the coalescence efficiency of oil-water separation is effectively improved. However, the method can not effectively treat the problems existing in the dehydration of the crude oil with high water content, and is difficult to adapt to the condition that the produced liquid of the oil field at the present stage generally has high water content.
The invention patent CN110878219A discloses an electric dehydration device for processing high water content crude oil, a filler area is arranged at the inlet side of the crude oil and consists of a honeycomb-shaped clamping plate and a filler, the water content of the crude oil is reduced in the filler area, the impact force of the crude oil entering a tank can be reduced, a plurality of areas are divided in the tank by grids, reducing cylindrical electrodes are distributed among central grids, reducing rectangular pyramid electrodes are arranged between the side wall of the electric dehydration device and the grids, and the design can enable the electric field in the tank to form uneven distribution. But under the protection of no insulating layer, the condition that the current is too large still can appear when the rectangular pyramid electrode is handled the crude oil of higher water content, and above-mentioned device design structure is complicated simultaneously, and the existence of jar interior filler region and grid can reduce crude oil handling capacity.
In view of this, the present application is specifically proposed.
Disclosure of Invention
The object of the present invention includes, for example, providing an apparatus and a method for dehydrating crude oil containing water, which can improve at least one of the problems mentioned in the background.
Embodiments of the invention may be implemented as follows:
in a first aspect, the invention provides a dehydration device for water-containing crude oil, which comprises a tank body, an electric field generation assembly and a feeding distributor; the tank body is connected with an oil discharge pipe, the oil discharge pipe is positioned above the electric field generation assembly, and the feeding distributor is arranged at the lower part of the tank body and positioned below the electric field generation assembly;
the electric field generating assembly comprises a plurality of groups of grounding pole rod groups and a plurality of groups of positive pole rod groups; the multiple groups of grounding pole rod groups and the multiple groups of positive pole rod groups are alternately arranged at intervals between one group of grounding pole rod groups and one group of positive pole rod groups, and the adjacent grounding pole rod groups and the positive pole rod groups are vertically opposite; each group of the grounding electrode rod groups comprises a plurality of grounding electrode rods, and each group of the positive electrode rod groups comprises a plurality of positive electrode rods which are in one-to-one correspondence with the plurality of grounding electrode rods;
every earth electrode stick is the conducting electrode stick, and every anodal stick all includes utmost point stick body and cladding in the insulating layer of utmost point stick body lower part outer wall, and the utmost point stick body is the conducting electrode stick.
In an alternative embodiment, each group of positive rods further comprises a transversely arranged mounting hanger, and the top of each positive rod in the group of positive rods is mounted on the hanger and vertically arranged.
In an optional embodiment, the outer wall of the top end of the positive rod is provided with a thread, the top of the positive rod penetrates through the mounting hanger and is fixed on the mounting hanger through a gasket and a nut matched with the thread.
In an alternative embodiment, the insulating layer is made of teflon, fluorinated ethylene propylene, polyvinylidene fluoride, fluoroplastic, nylon, tempered glass, ceramic, or the like.
In an alternative embodiment, the bottom end of each positive rod is provided with an insulation anticreeping coating piece.
In an optional embodiment, the feeding distributor comprises a feeding pipe communicated with the outside and a distribution pipe horizontally arranged in the tank body, and the pipe wall of the distribution pipe is provided with a plurality of liquid outlet holes in the horizontal direction.
In an optional embodiment, the top of the tank body is provided with an oil pocket, and the oil pocket is connected with an external oil discharge pipe.
In an alternative embodiment, the dewatering device for crude oil containing water further comprises a level meter, and the level meter is arranged on the tank body.
In an alternative embodiment, the dehydration device for crude oil containing water further comprises a transformer and a high-voltage wire connected with the transformer, wherein the high-voltage wire is connected with each group of positive rods.
In a second aspect, the present invention provides a method for dehydrating crude oil containing water, comprising introducing crude oil containing water into a dehydration apparatus for crude oil containing water to perform dehydration treatment; the voltage in the dehydration process is 2000-18000V, preferably 3000-15000V.
The beneficial effects of the embodiment of the invention include, for example:
the device that this application provided, because the specific setting of subassembly takes place for the electric field, especially positive pole stick upper portion is this kind of setting of bare electrode lower part outer wall cladding insulating layer, because the separation of insulating layer, make the regional weak electric field that forms of lower part of positive pole stick under high pressure, when realizing obviously reducing the polar plate area, the last strong weak distribution of electric field strength in the electric field region, high water-containing oil can prevent that the high water-containing district water chain in lower part from switching on in the static coalescence, cause the electric field to collapse, the lower part electric field weakens, the water droplet can subside under the action of gravity better. The application of this kind of design can reduce electric dehydration device's operating current, effectively solves the problem that the current flows through highly on the polar plate when handling high moisture crude oil, avoids electric current to arouse electric field intensity decline or short circuit greatly to improve the dehydration efficiency to high moisture crude oil, the cost problem that the complicated structure brought can be avoided to such design simultaneously.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
FIG. 1 is a schematic diagram of a dehydration plant for crude oil containing water provided by an embodiment of the present application;
FIG. 2 is a schematic view of the structure of FIG. 1 taken at A-A and viewed from the right;
fig. 3 is a structural schematic diagram of a left view after being cut at a-A in fig. 1.
Icon: 100-dehydration unit of crude oil containing water; 110-a tank body; 120-an electric field generating assembly; 121-ground pole bar set; 122-a ground pole bar; 123-connecting plate; 124-fixing plate; 125-positive pole bar group; 126-positive pole bar; 127-an insulating layer; 128-anticreep cover; 129-installing a hanger; 131-a spacer; 132-a nut; 140-a feed distributor; 141-a feed pipe; 142-a distribution pipe; 150-interface level meter; 160-oil pocket; 170-a transformer; 171-high voltage line; 180-manhole; 190-the drain pipe.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. indicate an orientation or a positional relationship based on that shown in the drawings or that the product of the present invention is used as it is, this is only for convenience of description and simplification of the description, and it does not indicate or imply that the device or the element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.
Referring to fig. 1-3, the present embodiment provides a dewatering apparatus 100 for crude oil containing water, which includes a tank 110, an electric field generating assembly 120, and a feed distributor 140; the tank 110 is connected with an oil discharge pipe (not shown), which is located above the electric field generating assembly 120, and the feeding distributor 140 is disposed at the lower part of the tank and below the electric field generating assembly 120;
the electric field generating assembly 120 comprises a plurality of groups of grounding electrode rod groups 121 and a plurality of groups of positive electrode rod groups 125; the multiple groups of grounding electrode rod groups 121 and the multiple groups of positive electrode rod groups 125 are alternately arranged at intervals between one group of grounding electrode rod group 121 and one group of positive electrode rod group 125, and the adjacent grounding electrode rod groups 121 and the adjacent positive electrode rod groups 125 are vertically arranged oppositely; each group of the ground electrode rod groups 121 includes a plurality of ground electrode rods 122, and each group of the positive electrode rod groups 125 includes a plurality of positive electrode rods 126 corresponding to the plurality of ground electrode rods 122 one to one;
each grounding electrode rod 122 is a conductive electrode rod, each positive electrode rod 126 comprises a electrode rod body and an insulating layer 127 coated on the outer wall of the lower part of the electrode rod body, and the electrode rod body is a conductive electrode rod.
According to the dehydration device 100 for crude oil containing water provided by the embodiment of the application, due to the specific arrangement of the electric field generating assembly 120, particularly the arrangement that the upper part of the positive rod 126 is a bare electrode and the outer wall of the lower part is coated with the insulating layer 127, due to the obstruction of the insulating layer 127, a weak electric field is formed in the lower area of the positive rod 126 under high pressure, the area of a polar plate is obviously reduced, meanwhile, the upper strength and the lower strength of the electric field intensity in the electric field area are distributed in a weak manner, the conduction of a water chain in the lower high water-containing area can be prevented, the electric field collapse and the lower electric field weakening are caused, and water drops can be better settled under the action of gravity. The application of this kind of design can reduce electric dehydration device's operating current, effectively solves the problem that the current flows through highly on the polar plate when handling high moisture crude oil, avoids electric current to arouse electric field intensity decline or short circuit greatly to improve the dehydration efficiency to high moisture crude oil, the cost problem that the complicated structure brought can be avoided to such design simultaneously. In addition, the feeding distributor 140 is arranged at the lower part of the tank body 110, the oil and water flow out of the feeding distributor 140 in an up-and-down flow mode, and the rising speed of the oil and the falling speed of the water in the up-and-down flow mode are higher than those in a horizontal flow mode of feeding of a conventional separator, so that the oil and water separation is facilitated.
The application provides a mode of use of water-containing crude oil dehydration apparatus 100:
crude oil enters the device through the feeding distributor 140, most of water in high-water-content crude oil in the feeding distributor directly sinks into a water phase under the action of gravity, oil-water emulsion is dispersed by the feeding distributor and enters a water phase area at the middle lower part of the tank body 110, part of water drops are further removed from the oil-water emulsion through washing of the water phase area, then the oil phase moves upwards and enters the oil phase, and the oil phase sequentially passes through an electrostatic coalescence electric field area (weak electric field area) and a strong electric field area to remove the water under the action of two electric fields. The distribution of the double electric fields of 'strong top and weak bottom' is realized by coating the insulating layer 127 on the equal-diameter cylindrical electrode, and areas with different conductivities are constructed on the electrode, so that the dehydration treatment of different depths and different water contents of an emulsion layer in a dehydration tank is realized. The dehydrated crude oil rises to the oil pocket at the top of the tank body 110 and is discharged out of the dehydration device through an oil discharge pipe communicated with the oil pocket.
The following provides a further description of the dewatering apparatus 100 for crude oil containing water provided in the examples of the present application.
Preferably, the insulating layer 127 coated on the lower portion of the positive electrode rod 126 is made of teflon, fluorinated ethylene propylene, polyvinylidene fluoride, fluoroplastic, nylon, toughened glass, ceramic, or the like, and these materials are common insulating materials and applied to the weak electric field that can be stabilized by the component in the present application.
The bottom end of each positive rod 126 is provided with an insulating anti-leakage coating 128 to prevent electrical leakage.
Each set of positive rods 125 also includes a transversely disposed mounting hanger 129 on which the top of each positive rod 126 within the set of positive rods 125 is mounted in a vertical arrangement.
Further, the outer wall of the top end of the anode rod 126 is provided with a thread, the top of the anode rod 126 passes through the mounting hanger 129, and is fixed on the mounting hanger 129 through a gasket 131 and a nut 132 matched with the thread. The assembly and disassembly are facilitated by the manner of the washer 131 and nut 132 fixation.
Each group of the grounding rod set 121 includes a connecting plate 123 transversely disposed, and the top of the group of the grounding rods 122 is connected with the connecting plate 123 and vertically disposed. Each set of grounding rods 122 further includes a fixing plate 124 disposed transversely, and the bottom of each set of grounding rods 122 is connected to the fixing plate 124.
The oil pocket 160 is provided on the top of the tank body 110 of the dewatering device 100 for crude oil containing water, the oil pocket 160 is connected to the oil discharge pipe, and the oil after dewatering enters the oil pocket 160 and is discharged through the oil discharge pipe connected to the oil pocket 160. The drain pipe 190 is connected to the bottom of the tank 110 of the dewatering apparatus 100 for crude oil containing water, and when the water in the apparatus reaches a certain amount, the water is discharged through the drain pipe 190.
The dehydration apparatus 100 for crude oil containing water further comprises a transformer 170 and a high voltage line 171 connected to the transformer 170, the high voltage line 171 being connected to each of the positive rods 126. The dewatering apparatus 100 for crude oil containing water further includes a ground line connected to each of the ground bars 122.
The dewatering apparatus 100 for crude oil containing water further includes a level meter 150, the level meter 150 is disposed on the tank 110, and the level meter 150 is used for detecting the height of the oil-water interface in the tank 110.
Preferably, the feeding distributor 140 comprises a feeding pipe 141 communicated with the outside and a horizontally arranged distribution pipe 142 positioned in the tank 110, and the pipe wall of the distribution pipe 142 is provided with a plurality of liquid outlet holes in the horizontal liquid outlet direction.
Because the liquid outlet holes of the feeding distributor 140 are used for discharging liquid in the horizontal direction, the turbulence degree formed in the vertical direction in the liquid discharging process is small, and the problem that the separation effect is not good due to the fact that water-containing oil directly flows to the top of the tank body 110 under the turbulence effect can be solved.
The side wall of the tank body 110 of the dewatering apparatus for crude oil containing water is provided with a manhole 180. Further, opposite sides of the tank body 110 are provided with manholes 180.
The manhole 180 is provided to facilitate installation and maintenance of the equipment internals.
The following describes the dewatering apparatus 100 for crude oil containing water provided in the present application with reference to specific examples.
Example 1
In the electric dehydration experimental apparatus used in this embodiment, the diameter of the tank is 250mm, the length is 300mm, the electrode group pitch is 20mm, the number of the groups of the grounding electrode rod groups 121 is 7, each group has 11 grounding electrode rods 122, the length of each grounding electrode rod 122 is 85mm, and the diameter is 5 mm; the number of the positive electrode rod groups 125 is 7, each group is provided with 11 positive electrode rods 126, the length of each positive electrode rod 126 is 87mm, and the diameter of each positive electrode rod 126 is 5 mm; the length of the bare electrode part is 29mm, the length of the insulating layer 127 is 58mm, and the insulating layer 127 is made of polytetrafluoroethylene.
In a certain offshore oil field A in Bohai Bay, as the water content of the produced well fluid reaches up to 90% in the later stage of exploitation, the crude oil density at normal temperature is 1.0035g/cm3, the electric dehydration experimental device is adopted in a laboratory to treat four kinds of emulsion with different water contents, the operation pressure is 0.25MPa, the separation temperature is 60 ℃, the liquid phase retention time is 40 minutes, and the voltage is 2000-6000V in the dehydration process. The water content after dehydration is shown in Table 1.
Table 1 example 1 dewatering effect
Example 2
In the electric dehydration experimental apparatus used in this embodiment, the diameter of the tank is 250mm, the length is 500mm, the electrode group pitch is 50mm, the number of the groups of the grounding electrode rod groups 121 is 5, each group has 7 grounding electrode rods 122, the length of each grounding electrode rod 122 is 85mm, and the diameter is 10 mm; the number of the positive electrode rod groups 125 is 5, each group has 7 positive electrode rods 126, each positive electrode rod 126 has a length of 87mm and a diameter of 10 mm; the length of the bare electrode part is 29mm, the length of the insulating layer 127 is 58mm, and the insulating layer 127 is made of fluorinated ethylene propylene.
In a land oil field B in the east part, the water content of the produced well fluid is up to 85 percent, the crude oil density at normal temperature is 0.9834g/cm3, the laboratory adopts the electric dehydration experimental device to process the four emulsions with different water contents, the operation pressure is 0.25MPa, the separation temperature is 60 ℃, the residence time of the liquid phase is 40 minutes, and the voltage is 5000-18000V in the dehydration process. The water content after dewatering is shown in table 2.
Table 2 example 2 dewatering effect
As can be seen from the two examples, the high water content crude oil in two different regions has higher dehydration efficiency, which shows that the dehydration device 100 for water-containing crude oil provided by the invention can effectively reduce the water content of the high water content crude oil.
To sum up, the dewatering method of crude oil containing water that this application embodiment provided, because the specific setting of subassembly takes place for the electric field, especially positive pole stick upper portion is this kind of setting of bare electrode lower part outer wall cladding insulating layer, because the separation of insulating layer, make the lower part region of positive pole stick form the weak electric field under high pressure, when realizing obviously reducing the polar plate area, the upper and lower weak distribution of electric field strength in the electric field region, high water-containing oil can prevent that the water chain of lower part high water-containing region from conducting in electrostatic coalescence, cause the electric field to collapse, the lower part electric field weakens, the water droplet can be better subsides under the action of gravity. The application of this kind of design can reduce electric dehydration device's operating current, effectively solves the problem that the current flows through highly on the polar plate when handling high moisture crude oil, avoids the electric current to arouse electric field intensity decline or short circuit greatly to improve the dehydration efficiency to high moisture crude oil, the cost problem that the complex construction brought can be avoided to such design simultaneously.
The embodiment of the application also provides a dehydration method of the water-containing crude oil, which comprises the step of introducing the water-containing crude oil into a dehydration device of the water-containing crude oil for dehydration treatment. In order to ensure good dehydration effect, the voltage in the dehydration process is 2000-18000V, preferably 3000-15000V.
The method provided by the embodiment of the application adopts the crude oil containing water provided by the embodiment of the application to carry out dehydration, so that the dehydration effect of the dehydration method is good.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The dehydration device for the water-containing crude oil is characterized by comprising a tank body, an electric field generation assembly and a feeding distributor; the tank body is connected with an oil discharge pipe, the oil discharge pipe is positioned above the electric field generation assembly, and the feeding distributor is arranged at the lower part of the tank body and below the electric field generation assembly;
the electric field generating assembly comprises a plurality of groups of grounding pole rod groups and a plurality of groups of positive pole rod groups; the multiple groups of the grounding pole bar groups and the multiple groups of the positive pole bar groups are alternately arranged at intervals between one group of the grounding pole bar groups and one group of the positive pole bar groups, and the adjacent grounding pole bar groups and the positive pole bar groups are vertically opposite; each group of the grounding electrode rod groups comprises a plurality of grounding electrode rods, and each group of the anode rod groups comprises a plurality of anode rods which are in one-to-one correspondence with the plurality of grounding electrode rods;
each grounding electrode rod is a conductive electrode rod, each positive electrode rod comprises an electrode rod body and an insulating layer coated on the outer wall of the lower portion of the electrode rod body, and the electrode rod body is a conductive electrode rod.
2. The apparatus for dehydrating hydrous crude oil as claimed in claim 1, wherein each said group of positive rods further comprises a transversely disposed mounting hanger, the top of each said positive rod in said group of positive rods being mounted on said hanger in a vertical disposition.
3. The apparatus for dehydrating aqueous crude oil according to claim 2, wherein the top end of the positive rod is provided with a screw thread, and the top of the positive rod passes through the mounting hanger and is fixed on the mounting hanger by a gasket and a nut which is matched with the screw thread.
4. The apparatus for dehydrating hydrous crude oil as claimed in claim 1, wherein said insulating layer is made of polytetrafluoroethylene, fluorinated ethylene propylene, polyvinylidene fluoride, fluoroplastic, nylon, tempered glass or ceramic.
5. The apparatus for dehydrating hydrous crude oil as claimed in claim 1, wherein the bottom end of each of said positive electrode bars is provided with an insulating anticreeping covering member.
6. The water-containing crude oil dehydration device according to any one of claims 1 to 5, wherein said feeding distributor comprises a feeding pipe communicated with the outside and a horizontally arranged distribution pipe located in said tank, and the pipe wall of said distribution pipe is provided with a plurality of liquid outlet holes in the horizontal direction.
7. The water-containing crude oil dehydration device according to any of claims 1 to 5 characterized in that the top of said tank body is provided with an oil pocket connected with an external oil drain pipe.
8. The apparatus for dehydrating water-containing crude oil as set forth in any one of claims 1 to 5, further comprising a level meter provided on the tank.
9. The apparatus for dehydrating crude oil containing water according to any one of claims 1 to 5, further comprising a transformer and a high-voltage line connected to the transformer, the high-voltage line being connected to each of the positive rods.
10. A method for dehydrating crude oil containing water, comprising introducing crude oil containing water into the dehydration apparatus for crude oil containing water according to any one of claims 1 to 9 to perform dehydration treatment; the voltage in the dehydration process is 2000-18000V, preferably 3000-15000V.
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