阅读说明：本技术 一种可处理中间层的原油电脱水系统 (Crude oil electric dewatering system capable of treating intermediate layer ) 是由 孙治谦 齐壮 王振波 刘兆增 李强 朱丽云 于 2021-09-27 设计创作，主要内容包括：本发明提供一种了可处理中间层的原油电脱水系统,包括电脱水器和旋流分离单元,在所述电脱水器内的中部位置处设置有多根水平分布的收集管,所述收集管上连通有向下伸出电脱水器的引出管,所述引出管将电脱水器内中间乳化层引流出所述电脱水器并连通至旋流分离单元的入口,由所述旋流分离单元实现电脱水器内中间乳化层的再处理；该系统克服了常规电脱水器工作一段时间后分离效率降低、脱后油含水超标、频繁跳闸等缺点,同时保留了电脱水器的优点,具有脱水效率高、处理量大、维修方便等优点。(The invention provides a crude oil electric dehydration system capable of treating a middle layer, which comprises an electric dehydrator and a cyclone separation unit, wherein a plurality of collecting pipes which are horizontally distributed are arranged at the middle position in the electric dehydrator, the collecting pipes are communicated with an eduction pipe which extends out of the electric dehydrator downwards, the eduction pipe leads a middle emulsion layer in the electric dehydrator out of the electric dehydrator and is communicated to an inlet of the cyclone separation unit, and the cyclone separation unit realizes the retreatment of the middle emulsion layer in the electric dehydrator; the system overcomes the defects of low separation efficiency after the conventional electric dehydrator works for a period of time, excessive water content of oil after dehydration, frequent tripping and the like, simultaneously retains the advantages of the electric dehydrator, and has the advantages of high dehydration efficiency, large treatment capacity, convenient maintenance and the like.)

1. A crude oil electric dehydration system capable of processing a middle layer is characterized by comprising an electric dehydrator and a cyclone separation unit, wherein a plurality of collecting pipes which are horizontally distributed are arranged at the middle position in the electric dehydrator, the collecting pipes are communicated with an eduction pipe which extends out of the electric dehydrator downwards, and the eduction pipe drains a middle emulsion layer in the electric dehydrator out of the electric dehydrator; the eduction tube is communicated with the inlet of the cyclone separation unit, and the cyclone separation unit realizes the retreatment of the middle emulsion layer in the electric dehydrator.

2. The crude oil electric dewatering system as claimed in claim 1, further characterized in that the cyclone separation unit is a cyclone separator, and the light phase flow separated by the cyclone separator is returned to the electric dewaterer inlet; a static mixer is also arranged in a pipeline in front of the inlet of the cyclone separator, and a dosing port is arranged in front of the static mixer.

3. The crude oil electric dewatering system as claimed in claim 1, further characterized in that the cyclone separation unit comprises a first cyclone unit and a second cyclone unit, both of which are connected in series, the outlet pipe is communicated with the inlet of the first cyclone unit, the upper light phase overflow port of the first cyclone unit returns to the crude oil inlet of the electric dehydrator, the bottom heavy phase outlet of the first cyclone unit is communicated to the inlet of the second cyclone unit through a pipeline, the upper light phase overflow port of the second cyclone unit also returns to the crude oil inlet of the electric dehydrator, and the bottom heavy phase outlet of the second cyclone unit is communicated to the sewage treatment unit through a pipeline.

4. A crude oil electric dewatering system as claimed in any one of claims 1 to 3, further characterized in that the electric dewatering device main body structure is a tank body, one end of the tank body is provided with a crude oil inlet, the top of the other end of the tank body is provided with an oil phase outlet, and the bottom is provided with a water phase outlet; a plurality of rows of horizontal plate electrodes are arranged in the tank body.

5. An electric crude oil dewatering system as claimed in claim 1, further characterized in that the collection and withdrawal pipes are distributed at different depths within the electric dehydrator,

6. the crude oil electric dewatering system according to claim 2, further characterized in that each eduction tube is provided with a flow control valve to control the flow of the middle emulsion layer; sampling ports are arranged at the upstream of the dosing port and the downstream of the eduction tube.

7. The crude oil electric dewatering system as claimed in claim 4, further characterized in that the surface of the horizontal plate electrode is coated with a layer of insulating hydrophobic material.

8. The crude oil electric dewatering system as claimed in claim 6, further characterized in that the chemical feeding port, the sampling port and the inlet and outlet of the first cyclone unit and the second cyclone unit are all provided with flow regulating valves.

9. The crude oil electric dewatering system as claimed in claim 7, further characterized by comprising a power source, wherein the power source is arranged on the upper surface of the tank body of the electric dewatering device 2, can adopt a rectangular wave alternating current power source, and supplies power to the horizontal plate electrode through a lead.

10. The crude oil electric dewatering system as claimed in claim 2, further characterized in that the static mixer is an SV type static mixer.

Technical Field

The invention belongs to the field of petrochemical equipment and crude oil electric dehydration equipment, and particularly relates to a crude oil electric dehydration system capable of treating an intermediate layer.

Background

The middle emulsifying layer of oil and water is a very complex oil-water emulsion formed on an oil-water interface in the oil-water separation treatment process, such as W/O/W, O/W/O and the like, the existence of the middle layer can be an obstacle for flow separation of oil and water, the mass transfer speed of the crude oil and the water layer on the upper layer is slowed down, and the mass transfer speed is distributed on the whole oil-water interface, so that the oil-water separation efficiency is reduced; and the oil-water mixture is continuously accumulated in the production process, occupies the separation volume of the equipment, reduces the retention time of the oil-water mixture in the equipment and further causes the separation effect to be poor. With the use of various chemical agents, the middle layer tends to be gradually thickened, and the adverse effects on the quality of crude oil demulsification dehydration and purified oil become more serious day by day, so that dehydration equipment cannot work normally, and the situations of overproof oil water content, unclear oil-water interface, frequent tripping of an electric dehydrator and the like frequently occur after dehydration. The problem is solved, the normal operation of the dehydration equipment and the quality of the external oil transportation (such as water content, salt content, mechanical impurities and the like) can be ensured, and the production cost can be reduced.

In crude oil extraction, a chemical demulsification dehydration method using a demulsifier and an electric demulsification dehydration method using an electric field are commonly used. Many research units in China have studied complex emulsions in the middle layer, the proposed technical route is mainly chemical demulsification, but the demulsifier is generally added at the inlet of a container and enters a separation device along with liquid fluid, but after an emulsion layer is accumulated in a dehydrator, the demulsifier cannot reach proper medicament concentration in the emulsion layer, so that an economical and efficient method for solving the emulsion layer is not available so far, and therefore, the development of an economical, efficient and clean combined demulsification technology for treating the oil-water middle layer (emulsion layer) has very important significance.

Disclosure of Invention

In order to solve the technical problems, the invention provides a crude oil electric dehydration system capable of treating an intermediate layer, which changes the adding position of a demulsifier by arranging an eduction tube in an electric dehydrator, and simultaneously integrates a centrifugal separation device with shorter time consumption into the system so as to carry out deep demulsification and retreatment on the oil-water intermediate layer, overcomes the defects of reduction of separation efficiency after a conventional electric dehydrator works for a period of time, overproof water content of oil after dehydration, frequent tripping and the like, simultaneously retains the advantages of the electric dehydrator, and has the advantages of high dehydration efficiency, large treatment capacity, convenient maintenance and the like.

In order to achieve the purpose, the technical scheme of the invention is as follows: an electric crude oil dewatering system capable of treating a middle layer comprises an electric dehydrator, a power supply, a horizontal plate electrode, a first cyclone unit, a second cyclone unit, a crude oil inlet, an oil phase outlet, a water phase outlet, an outlet pipe, a sampling port, a dosing port, a static mixer, a booster pump and a sewage treatment unit. The power supply is arranged on the top of the electric dehydrator; the electric dehydrator is connected with the static mixer through an eduction tube, and the middle of the electric dehydrator is provided with a sampling port and a dosing port; the outlet of the static mixer is connected with the inlet of the first cyclone unit; the underflow opening of the first cyclone unit is connected with the inlet of the second cyclone unit; the underflow port of the second cyclone unit is connected with a sewage treatment unit; the overflow ports of the first cyclone unit and the second cyclone unit are connected with the crude oil inlet of the electric dehydrator through a booster pump.

Further, the electric dehydrator adopts horizontal arrangement and comprises a tank body, the inside of the tank body is divided into a dehydration region and an outer discharge region, the upper part of the dehydration region is a horizontal electrode plate group, the lower part of the dehydration region is connected with a plurality of eduction tubes with different depths, and the eduction tubes are used for discharging an oil-water intermediate emulsion layer. One end of the tank body is provided with a crude oil inlet, the top is provided with an oil phase outlet, and the bottom is provided with a water phase outlet.

Furthermore, the surface of the horizontal plate electrode is coated with a layer of insulating hydrophobic material, which can avoid short circuit of the electrode, slow down the retention time of liquid drops on the polar plate and prevent the liquid drops from being attached to the polar plate.

Furthermore, axial-flow type cyclone separators are selected for the first cyclone unit and the second cyclone unit, secondary cyclone separation can be carried out on the oil-water middle layer flowing out of the eduction tube, and separation efficiency is effectively improved.

Furthermore, the static mixer is an SV type static mixer, has stirring and conveying functions, mixes the oil-water intermediate layer with a specific demulsifier, reduces the emulsification degree of the intermediate layer, and achieves the effect of pre-separation before entering the cyclone unit.

Furthermore, the inlet and outlet of the eduction tube, the dosing port, the sampling port and the rotational flow unit are all provided with flow regulating valves for regulating the flow and ensuring accurate sampling.

Furthermore, overflow ports of the first cyclone unit and the second cyclone unit are connected with booster pumps, and the booster pumps are used for circulating the oil phase subjected to re-separation to a crude oil inlet of the electric dehydrator.

Furthermore, a bottom flow port of the second rotational flow unit is connected with a sewage treatment unit, so that the purpose of deep purification of the oily sewage is achieved.

The working principle of the invention is as follows: during operation, crude oil gets into from electric dehydrator one end, take place oil-water separation through the plate electrode effect, the light component of oil phase flows from the top export, the heavy component of water phase flows from the bottom export, emulsification layer in the middle of producing between the profit, the intermediate level is derived through the outlet tube of the different degree of depth, get into the second grade through static mixer entering whirl unit that establishes ties after adding the demulsifier stirring, wherein whirl unit one and whirl unit two overflow mouth in the exhaust oil phase all circulate to electric dehydrator crude oil entry end through the booster pump, whirl unit two's underflow opening is connected sewage treatment unit and is carried out the degree of depth and purify.

Compared with the prior art, the invention has the beneficial effects that:

the invention provides a crude oil electric dehydration system capable of processing an intermediate layer, aiming at the conditions that the water content of oil after dehydration exceeds standard, an oil-water interface is unclear, an electric dehydrator frequently trips and the like caused by excessive thickness of the oil and water in the working process of a conventional electric dehydrator, the electric dehydrator is coupled with a secondary cyclone unit, the intermediate layer accumulated in the electric dehydrator is processed in real time, the blocking effect of an emulsion layer in the oil and water is effectively weakened, and the separation efficiency of the electric dehydrator is ensured to reach the standard.

Drawings

FIG. 1 is a schematic flow diagram of an electric crude oil dewatering system according to the present invention;

in the figure: 1. the device comprises a crude oil inlet, 2 an electric dehydrator, 3 an eduction tube, 4 a flow regulating valve, 5 a sampling port, 6 a medicine adding port, 7 a static mixer, 8 a first cyclone unit, 9 a second cyclone unit, 10 a power supply, 11 a horizontal plate electrode, 12 an oil phase outlet, 13 a water phase outlet, 14 a booster pump, 15 and a sewage treatment unit.

Detailed Description

The invention is described in further detail below with reference to the accompanying examples.

The present invention is described in terms of specific embodiments, and other advantages and benefits of the present invention will become apparent to those skilled in the art from the disclosure herein.

Referring to the drawings, the structures, ratios, sizes, and the like shown in the drawings are only used for matching the disclosure of the present disclosure, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present disclosure can be implemented, so that the present disclosure has no technical significance, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the disclosure of the present disclosure without affecting the efficacy and the achievable purpose of the present disclosure. Meanwhile, the positional limitation terms used in the present specification are for clarity of description only, and are not intended to limit the scope of the present invention, and changes or modifications of the relative relationship therebetween may be regarded as the scope of the present invention without substantial changes in the technical content.

As shown in fig. 1, the crude oil electric dehydration system for treating the middle layer of the invention comprises an electric dehydrator 2 and a cyclone separation unit, wherein the main structure of the electric dehydrator 2 is a tank body, one end of the tank body is provided with a crude oil inlet 1, the top of the other end of the tank body is provided with an oil phase outlet 12, and the bottom of the tank body is provided with a water phase outlet 13; the internal portion of jar is equipped with multirow horizontal plate electrode 11, takes place oil-water separation through horizontal plate electrode 11 effect, horizontal plate electrode 11 supplies power through power 10.

A plurality of collecting pipes which are horizontally distributed are arranged at the middle position in the electric dehydrator 2, an eduction pipe 3 which extends out of the electric dehydrator 2 downwards is communicated on the collecting pipes, the eduction pipe 3 is communicated with an inlet of the cyclone separation unit, and the cyclone separation unit realizes the retreatment of the middle layer in the electric dehydrator 2.

The cyclone separation unit includes cyclone unit 8 and cyclone unit two 9, and both are cyclone separator and concatenate together, 3 intercommunications of fairlead static mixer 7 has still been installed in the pipeline before cyclone unit 8's the entry to the inlet of cyclone unit 8, and is especially important, has set up in this application in static mixer 7 the place ahead and has added medicine mouth 6 to selectively add the demulsifier according to the nature in intermediate level, make the middle emulsion layer that flows out via fairlead 3 with through adding medicine mouth 6 and add into the demulsifier mix the back and get into static mixer 7 in order to fully mix the demulsifier, then flow to carry out the separation of profit in the cyclone separation unit. The upper light phase overflow port of the first cyclone unit 8 returns to the crude oil inlet 1 of the electric dehydrator 2 after passing through the booster pump, the bottom heavy phase outlet of the first cyclone unit 8 is communicated to the inlet of the second cyclone unit 9 through a pipeline to perform cyclone centrifugal separation again, the upper light phase overflow port of the second cyclone unit 9 also returns to the crude oil inlet 1 of the electric dehydrator 2 after passing through the booster pump 14, and the bottom heavy phase outlet of the second cyclone unit 9 is communicated to the sewage treatment unit 15 through a pipeline, so that the oil components in the product of the cyclone separation unit return to the electric dehydrator 2 again to perform dehydration separation, and finally the oil products up to the standard are obtained, namely the electric dehydrator and the cyclone separation unit are coupled in a process circulation line, and too many additional supporting facilities are not required to be added due to the two sets of equipment.

A flow regulating valve 4 is also arranged on the pipeline of the leading-out pipe 3 to realize the flow control of the leading-out middle emulsion layer; the upper reaches of the medicine adding port 6 are also provided with a sampling port 5, and workers can judge the accumulation state of the middle emulsion layer in the electric dehydrator 2 through the sample components taken out from the sampling port 5, so as to adjust the leading-out flow of the flow regulating valve 4 to be large or small or even closed. And select the demulsifier to handle once more in the middle emulsion layer of drainage play, can adjust the quantity of demulsifier according to the actual flow and the emulsification state of the middle emulsion layer of drainage play, reduced the quantity of demulsifier by a wide margin.

Further, the electric dehydrator 2 is horizontally arranged and comprises a tank body, the inside of the tank body is divided into a dehydration area and an outer discharge area, the upper part of the dehydration area is a horizontal plate electrode group, the horizontal plate motor group comprises a plurality of layers of rows of horizontal plate electrodes 11, the surface of each horizontal plate electrode 11 is coated with a layer of insulating hydrophobic material, the insulating hydrophobic material can avoid electrode short circuit, slow down the retention time of liquid drops on a polar plate and prevent the liquid drops from being attached to the polar plate; the power supply 10 is arranged on the upper surface of the tank body of the electric dehydrator 2, can adopt a rectangular wave alternating current power supply and supplies power to the horizontal plate electrode 11 through a lead; the stand-off 3 sets up in the lower part in dehydration region, and stand-off 3 divide into many (having set up 5 in this embodiment), and many stand-off 3 set up the degree of depth difference, and stand-off 3 is used for discharging the middle emulsion layer of profit.

Further, the first cyclone unit 8 and the second cyclone unit 9 are both axial-flow type cyclone separators, and of course, other types of cyclone separators that induce swirl by tangential flow or induce swirl by guide vanes may also be used.

Furthermore, the static mixer 7 is an SV type static mixer, has stirring and conveying functions, mixes the oil-water intermediate layer with a specific demulsifier, reduces the emulsification degree of the intermediate layer, and achieves the effect of pre-separation before entering the cyclone unit.

Flow regulating valves are arranged at the medicine feeding port 6, the sampling port 5 and the inlets and outlets of the first cyclone unit 8 and the second cyclone unit 9, and are used for regulating the flow and ensuring accurate sampling; meanwhile, the flow regulating valves of the first cyclone unit 8 and the second cyclone unit 9 can also regulate the ratio of the inlet flow to the overflow flow through the opening of the valve so as to regulate the separation efficiency of the first cyclone unit 8 and the second cyclone unit 9.

The working principle and the working process of the application are simply introduced as follows: during operation, crude oil gets into from electric dehydrator 2's crude oil entry 1, oil-water separation takes place through horizontal plate electrode 11 effect, light component flows out from top oil phase export 12, heavy component flows out from bottom water phase export 13, produce between the profit and deposit middle emulsion layer gradually, middle emulsion layer leads out through the stand-off 3 of the different degree of depth, then mix with the demulsifier that adds from dosing port 6 and get into static mixer 7 after, further stir the mixture in static mixer 7 inside, reduce the emulsification degree, then get into the cyclone separation unit of second grade series connection through static mixer 7, wherein discharged oil phase all circulates to electric dehydrator crude oil entry 1 through the booster pump in cyclone unit one 8 and cyclone unit two 9's the overflow mouth, cyclone unit two 9's underflow mouth connects sewage treatment unit 15 and carries out the degree of depth purification.

The utility model provides a crude oil electric dehydration system is through coupling the cyclone separation unit in the process flow of electric dehydrator, drops the breakdown of emulsion separation of the inside middle emulsion layer self-loopa of electric dehydrator, can prevent effectively that the electric dehydrator from depositing too much and leading to separation efficiency to descend because of inside emulsion layer, accelerated the treatment effeciency of conventional electric dehydrator to a certain extent on the contrary moreover, have separation efficiency height, advantage such as handling capacity is big.

Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the invention, and it should be understood by those skilled in the art that various modifications and changes in equivalent structure or equivalent flow, or direct or indirect application to other related fields without creative efforts based on the technical solutions of the present invention may be made within the scope of the present invention.