A high-voltage pulsed electric field-based cyclone coupling demulsification separation system

Abstract

The application relates to the field of petroleum technology, in particular to a cyclone coupling demulsification separation system based on a high-voltage pulse electric field, which comprises a demulsification separation unit, a data acquisition unit, a pretreatment unit and a data analysis unit. The demulsification separation unit is used for demulsification dewatering of target emulsified oil wastewater through cyclone and spiral electric field. The data acquisition unit is used for collecting demand information. The pretreatment unit is used for initial water content state detection of the target emulsified oil wastewater, and a pretreatment mode is selected according to the initial water content state. The data analysis unit is used for determining an analysis adjustment mode according to a dewatering state, and the analysis adjustment mode is used for detecting a reference value of impurity content or adjusting dewatering parameters. In the adjustment of the dewatering parameters, a first pressure drop and a second pressure drop are detected to determine a pressure drop state, and the data analysis unit determines a pulse voltage adjustment mode according to the pressure drop state. The working parameters are adjusted according to the quality state of actual emulsified oil wastewater and the dewatering effect, so that the precision of demulsification working parameters is improved, and the actual working demand is met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of petroleum, in particular to a cyclone coupling demulsification separation system based on high-voltage pulse electric field. BACKGROUND

[0002] Pulse electric field is a research hotspot in recent years and is widely applied to the demulsification of emulsified oil wastewater. Under the action of pulse electric field, water droplets can be deformed by the dipole force of water droplets, water droplets are driven to form water droplet chains and fuse together to sink, and finally oil and water are separated. With the increasing seriousness of domestic crude oil, the separation effect of existing pulse electric dehydration equipment is increasingly required. However, in the actual demulsification and dehydration process, most of the device operating parameters are still set manually, which directly affects the effect of sewage treatment and even the long-period high-efficiency and safe operation of the device. Therefore, how to automatically and efficiently control the operating parameters of the demulsification and separation device is a problem to be solved at present.

[0003] Chinese patent publication No. CN116103058A discloses an electric field demulsifier, which comprises an electric field demulsification section, an inlet section for flowing in emulsified liquid, and an outlet section for flowing out emulsified liquid. The electric field demulsification section comprises a tube shell, a grounding electrode plate arranged in the tube shell, and a high-voltage insulated electrode electrically connected with a power supply. The independent space enclosed by the grounding electrode plate and the tube shell and the adjacent grounding electrode plates is formed, and a fluid channel is formed. At least one high-voltage insulated electrode is arranged in each independent space. The high-voltage insulated electrode is arranged in a spaced manner with the tube shell and the grounding electrode plate. The fluid channel is in communication with the inlet section and the outlet section. It can be seen that the influence of impurities, water content and dehydration effect in emulsified oil wastewater on parameter setting is not considered in the scheme, which leads to the fact that the demulsification operating parameters cannot meet the actual working requirements. SUMMARY

[0004] Therefore, the present application provides a cyclone coupling demulsification separation system based on high-voltage pulse electric field to overcome the problem that the demulsifier in the prior art cannot adjust the operating parameters according to the quality state of actual emulsified oil wastewater and the dehydration effect, resulting in the fact that the operating parameters of the demulsifier cannot meet the actual working requirements.

[0005] To achieve the above-mentioned purpose, the present application provides a cyclone coupling demulsification separation system based on high-voltage pulse electric field, which comprises:

[0006] A demulsification and separation unit, which comprises a plurality of electric field cyclone demulsification devices, is used to demulsify and dehydrate the target emulsified oil wastewater through cyclone and spiral electric field;

[0007] A data acquisition unit connected with the demulsification and separation unit is used to acquire demand information;

[0008] a pretreatment unit connected with the data acquisition unit and the demulsification separation unit, for detecting an initial water content state of the target emulsified oil wastewater, and selecting a pretreatment mode according to the initial water content state;

[0009] a data analysis unit connected with the data acquisition unit and the demulsification separation unit, for determining an analysis adjustment mode according to the dewatering state, and detecting a reference value of impurity content in the analysis adjustment mode, or adjusting a dewatering parameter;

[0010] In the adjustment of the dewatering parameter, a first pressure drop and a second pressure drop are detected to determine a pressure drop state, and the data analysis unit determines a pulse voltage adjustment mode according to the pressure drop state.

[0011] The demand information includes water content, impurity content, water content of emulsified oil after demulsification and dewatering, first pressure drop, and second pressure drop of the target emulsified oil wastewater. The pretreatment unit includes several pretreatment devices, which are temperature raising devices, centrifugal dewatering devices, and sedimentation devices.

[0012] Further, the electric field cyclone demulsification device is in a cylindrical shape, and includes a water inlet area, a coalescence area, a separation area, and a water outlet area from top to bottom.

[0013] A flow stabilizing cone is arranged in the water inlet area, and the target emulsified oil wastewater flows into the coalescence area from the outer surface of the flow stabilizing cone.

[0014] A spiral electrode is arranged in the coalescence area, and the spiral electrode is wrapped with an insulating material. The target emulsified oil wastewater rotates in the coalescence area. The spiral electrode is connected with a pulse power supply, and the pulse power supply supplies power to the spiral electrode. When the spiral electrode is powered, an electric field generated by the spiral electrode is applied to the flow field of the target emulsified oil wastewater, so that the water droplets of the target emulsified oil wastewater are polarized and oscillated and coalesced.

[0015] An overflow pipe is arranged in the separation area, and the overflow pipe is connected with an overflow outlet. The target emulsified oil wastewater still rotates in the separation area under the action of centrifugal force. The dispersed phase water droplets with a larger density move to the edge wall and flow to the water outlet area under the action of the centrifugal force, and are finally discharged through the underflow port. The oil-water mixture with a lower water content is left in the central area, and flows to the overflow pipe under the action of the inner cyclone, and is finally discharged from the overflow outlet through the overflow pipe.

[0016] Further, the pretreatment unit detects an initial water content state of the target emulsified oil wastewater, and selects a pretreatment mode according to the initial water content state. The treatment mode is a first treatment mode for changing the temperature of the target emulsified oil wastewater, a second treatment mode for changing the conveying direction, and a third treatment mode for single centrifugal dewatering of the target emulsified oil wastewater.

[0017] The selection of the processing mode is related to a preset initial water content state in which the initial water content state is located.

[0018] Further, in the first processing mode, a heating device is used to heat the target emulsified oil wastewater, in the second processing mode, different conveying directions correspond to different electric field cyclone demulsification devices, and lengths of coalescence zones of the different electric field cyclone demulsification devices are different, and in the third processing mode, a centrifugal dehydration device is used to pre-dehydrate the target emulsified oil wastewater.

[0019] Further, the data analysis unit detects a dehydration state, and determines an analysis adjustment mode according to the dehydration state,

[0020] If the dehydration state is in a first preset dehydration state, the data analysis unit determines to detect an impurity content reference value;

[0021] If the dehydration state is in a second preset dehydration state, the data analysis unit determines to adjust a dehydration parameter.

[0022] Further, the first preset dehydration state is that a dehydration reference value is in a preset dehydration reference value range and a dehydration stability is less than a preset dehydration stability, and the second preset dehydration state is that the dehydration reference value is in a dehydration reference value range that needs to be adjusted.

[0023] Further, when the dehydration state is in the first preset dehydration state, the data analysis unit detects the impurity content reference value;

[0024] If the impurity content reference value is in a first preset impurity content reference value range, the data analysis unit determines to adjust a settling time;

[0025] If the impurity content reference value is in a second preset impurity content reference value range, the data analysis unit determines to adjust an inlet flow.

[0026] Further, when the dehydration state is in the second preset dehydration state, the data analysis unit detects a first pressure drop and a second pressure drop to determine a pressure drop state, and the data analysis unit determines a pulse voltage adjustment mode according to the pressure drop state;

[0027] If the pressure drop state is a first preset pressure drop state, the data analysis unit determines to increase the pulse voltage;

[0028] If the pressure drop state is a second preset pressure drop state, the data analysis unit determines to adjust the pulse voltage and determines to adjust the pulse voltage or the inlet flow according to a pressure drop response state.

[0029] Further, the pressure drop response state includes a first pressure drop response state in which the first pressure drop rises and the second pressure drop drops, and a second pressure drop response state in which the first pressure drop rises and the second pressure drop rises.

[0030] Further, in the first pressure drop response state, the inlet flow is adjusted for increase, and in the second pressure drop response state, the pulse voltage is adjusted for increase.

[0031] Compared with the prior art, the beneficial effects of the present application are that, in the technical scheme of the present application, the spiral electrode has good non-uniformity, which can accelerate water droplet coalescence and reduce water droplet breakage, the pretreatment unit detects the initial water content state of the target emulsified oil wastewater, and selects the pretreatment mode according to the initial water content state, so that the selection of the pretreatment mode is more in line with the quality of the actual emulsified oil wastewater, avoiding the waste of energy caused by the single or fixed combination of the pretreatment mode in the prior art, and the data analysis unit detects the dehydration state, and determines the analysis adjustment mode according to the dehydration state, so that the selection of the analysis adjustment mode is more in line with the actual working scenario, and the dehydration state reflects whether the system is stable, and when the dehydration state is in the second preset dehydration state, the data analysis unit detects the first pressure drop and the second pressure drop to determine the pressure drop state, and the data analysis unit determines the pulse voltage adjustment mode according to the pressure drop state, avoiding unreasonable selection of the pulse voltage and the inlet flow, which may cause excessive inlet flow to weaken the demulsification dehydration effect or excessive pulse voltage to cause energy waste and reduce the overflow outlet pressure drop, and thus, the present application improves the accuracy of the demulsification working parameters, and further improves the demulsification dehydration effect. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is a unit connection diagram of the embodiment of the present application based on the high-voltage pulse electric field and the cyclone coupling demulsification separation system;

[0033] Figure 2 It is a structure schematic diagram of the embodiment of the electric field cyclone demulsification device of the present application;

[0034] Figure 3 It is a flow chart of selecting the pretreatment mode according to the initial water content state of the embodiment of the present application;

[0035] Figure 4 It is a flow chart of determining the analysis adjustment mode according to the dehydration state of the embodiment of the present application;

[0036] In the figure: water inlet area 1, coalescence area 2, separation area 3, water outlet area 4, steady flow cone 5, spiral electrode 6, overflow pipe 7. DETAILED DESCRIPTION

[0037] In order to make the purpose and advantages of the present application more clear and explicit, the present application will be further described below in combination with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present application, and do not limit the present application.

[0038] The preferred embodiments of the present application will be described below with reference to the drawings. Those skilled in the art will appreciate that the embodiments are only used to explain the technical principles of the present application, and are not intended to limit the protection scope of the present application.

[0039] It should be noted that, in the description of the present application, the terms indicating the direction or positional relationship of "upper", "lower", "left", "right", "inner", "outer" and the like are based on the direction or positional relationship shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0040] In addition, it should be noted that, in the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. Those skilled in the art can understand the specific meaning of the above terms in the present application according to the specific circumstances.

[0041] Please refer to Figure 1 As shown in the figure, it is a unit connection diagram of a cyclone coupling demulsification separation system based on high-voltage pulse electric field according to an embodiment of the present application. The present application provides a cyclone coupling demulsification separation system based on high-voltage pulse electric field, which comprises:

[0042] A demulsification separation unit, which comprises a plurality of electric field cyclone demulsification devices, is used to demulsify and dewater the target emulsified oil wastewater through cyclone and spiral electric field;

[0043] A data acquisition unit connected with the demulsification separation unit is used to acquire demand information;

[0044] A pretreatment unit connected with the data acquisition unit and the demulsification separation unit is used to detect the initial water content state of the target emulsified oil wastewater, and select a pretreatment mode according to the initial water content state;

[0045] A data analysis unit connected with the data acquisition unit and the demulsification separation unit is used to determine an analysis adjustment mode according to the dewatering state, detect the impurity content reference value under the analysis adjustment mode, or adjust the dewatering parameters;

[0046] In the adjustment of the dewatering parameters, the first pressure drop and the second pressure drop are detected to determine the pressure drop state, and the data analysis unit determines a pulse voltage adjustment mode according to the pressure drop state;

[0047] The demand information includes the water content, impurity content, water content of the emulsified oil wastewater after demulsification and dehydration, first pressure drop, and second pressure drop. The pretreatment unit includes several pretreatment devices, namely a heating device, a centrifugal dehydration device, and a sedimentation device.

[0048] Please see Figure 2 As shown, this is a schematic diagram of the structure of the electric field vortex demulsifier according to an embodiment of the present invention. The electric field vortex demulsifier is cylindrical in shape and includes, from top to bottom, an inlet zone 1, a coalescence zone 2, a separation zone 3, and an outlet zone 4.

[0049] A flow stabilizing cone 5 is installed in the inlet zone 1. The target emulsified oil wastewater flows into the coalescence zone 2 from the outer surface of the flow stabilizing cone 5 after passing through the inlet zone 1.

[0050] A spiral electrode 6 is installed in the coalescence zone 2. The spiral electrode 6 is wrapped with insulating material. The target emulsified oil wastewater rotates and flows in the coalescence zone 2. The spiral electrode 6 is connected to a pulse power supply. The pulse power supply supplies power to the spiral electrode 6. When the power is supplied, the electric field generated by the spiral electrode 6 is applied to the flow field of the target emulsified oil wastewater, causing the water droplets of the target emulsified oil wastewater to polarize and generate oscillation and coalescence.

[0051] An overflow pipe 7 is installed in the separation zone 3, and an overflow outlet is connected to the outside of the overflow pipe 7. The target emulsified oil wastewater continues to rotate centrifugally in the separation zone. The denser dispersed phase water droplets move towards the side wall and flow towards the outlet zone 4 under the action of centrifugal force, and are finally discharged through the bottom outlet. The central area is left with an oil-water mixture with a lower water content, which flows towards the overflow pipe 7 under the action of internal swirling flow, and is finally discharged from the overflow outlet through the overflow pipe 7.

[0052] Please continue reading. Figures 1 to 4 As shown, the pretreatment unit detects the initial water content of the target emulsified oil wastewater and selects a pretreatment mode based on the initial water content. The treatment modes are: a first treatment mode that changes the temperature of the target emulsified oil wastewater, a second treatment mode that changes the conveying direction, and a third treatment mode that removes water from the target emulsified oil wastewater by single centrifugation.

[0053] The selection of the processing mode is related to the preset initial water content state of the initial water content state.

[0054] Specifically, the initial water content state includes a first preset initial water content state, a second preset initial water content state, and a third preset initial water content state, the first preset initial water content state selects the first processing mode, the water content in the target emulsified oil wastewater that has not been subjected to demulsification dehydration is greater than 10% and less than or equal to 20%, the second preset initial water content state selects the second processing mode, the water content in the target emulsified oil wastewater that has not been subjected to demulsification dehydration is greater than 20% and less than or equal to 30%, the third preset initial water content state selects the third processing mode, the water content in the target emulsified oil wastewater that has not been subjected to demulsification dehydration is greater than 30%, and if the water content in the target emulsified oil wastewater that has not been subjected to demulsification dehydration is less than or equal to 10%, the pretreatment is not needed.

[0055] Specifically, in the first processing mode, the heating device is used to heat the target emulsified oil wastewater, in the second processing mode, different conveying directions correspond to different electric field cyclone demulsification devices, the lengths of the coalescence zones of the different electric field cyclone demulsification devices are different, and in the third processing mode, the centrifugal dehydration device is used to pre-dehydrate the target emulsified oil wastewater.

[0056] Specifically, the lengths of the coalescence zones of the different electric field cyclone demulsification devices are different, that is, the lengths of the corresponding spiral electrodes are different, by selecting spiral electrodes with different lengths, the residence time of the target emulsified oil wastewater in the coalescence zone is changed, the greater the water content in the target emulsified oil wastewater that has not been subjected to demulsification dehydration, the greater the length of the selected spiral electrode; the centrifugal dehydration device can use any device with a centrifugal dehydration function, which is easily understood by those skilled in the art and will not be described here.

[0057] Specifically, the data analysis unit detects the dehydration state and determines the analysis adjustment mode according to the dehydration state,

[0058] If the dehydration state is in the first preset dehydration state, the data analysis unit determines to detect the impurity content reference value;

[0059] If the dehydration state is in the second preset dehydration state, the data analysis unit determines to adjust the dehydration parameter.

[0060] Specifically, the first preset dehydration state is that the dehydration reference value is in a preset dehydration reference value range and the dehydration stability is less than a preset dehydration stability, and the second preset dehydration state is that the dehydration reference value is in a dehydration reference value range that needs to be adjusted.

[0061] Specifically, the data acquisition unit acquires the water content of the target emulsified oil wastewater that has been subjected to demulsification dehydration every 3 minutes, and the data analysis unit counts the water content Hi in each monitoring period every monitoring period, Hi is the water content of the target emulsified oil wastewater that has been subjected to demulsification dehydration detected in the i-th time in the monitoring period, and the calculation formula of the dehydration reference value H0 is:

[0062] ;

[0063] The calculation formula of dehydration stability H is:

[0064] ;

[0065] Wherein, n is the total number of detection of the water content of the target emulsified oil wastewater which is completed by the demulsification dehydration unit in a single monitoring period; the values in the preset dehydration reference value range are all less than 10%, the values in the preset dehydration reference value range need to be adjusted are all greater than or equal to 10%, and the preset dehydration stability is 1 / (5%).

[0066] Specifically, when the dehydration state is in the first preset dehydration state, the data analysis unit detects the impurity content reference value;

[0067] If the impurity content reference value is in the first preset impurity content reference value range, the data analysis unit determines to increase the adjustment for the settling time, that is, the settling time of the settling device for the target emulsified oil wastewater which has not been subjected to demulsification dehydration, and the increase amount of the settling time is in a positive correlation with the maximum impurity content detected in the latest monitoring period;

[0068] If the impurity content reference value is in the second preset impurity content reference value range, the data analysis unit determines to adjust the inlet flow.

[0069] Specifically, the values in the first preset impurity content reference value range are all greater than 200 pieces / mL, the values in the second preset impurity reference value range are all less than or equal to 200 pieces / mL, the detection method of the impurity content is to use a laser particle counter, the impurity content is detected by the laser particle counter, the laser particle counter utilizes the principle that the micro-particles in the liquid propagation will scatter the laser beam, counts the number of solid particles in the target emulsified oil wastewater by emitting a laser beam and detecting scattered light, and records the value measured by the laser particle counter as the impurity content. The impurity content reference value = the absolute value of the difference between the maximum impurity content and the minimum impurity content detected in the latest monitoring period / the amount of target emulsified oil wastewater which is completed by the demulsification dehydration in a single monitoring period.

[0070] It can be understood that the solid particles adhere to the oil-water interface, so that the amount of interfacial active substances adsorbed by the oil-water interface decreases, which leads to the increase of interfacial tension, the increase of shear viscosity of the oil-water interface, and further the increase of difficulty of demulsification dehydration. Correspondingly, the impurity content reference value in the target emulsified oil wastewater is unstable, that is, it will lead to the dehydration stability being less than the preset dehydration stability.

[0071] Specifically, when the dewatering state is in the second preset dewatering state, the data analysis unit detects the first pressure drop and the second pressure drop to determine a pressure drop state, and the data analysis unit determines a pulse voltage adjustment mode according to the pressure drop state;

[0072] If the pressure drop state is the first preset pressure drop state, the data analysis unit determines to increase the pulse voltage, and the increase amount of the pulse voltage is positively correlated with the dewatering reference value;

[0073] If the pressure drop state is the second preset pressure drop state, the data analysis unit determines to adjust the pulse voltage and determines to adjust the pulse voltage or the inlet flow according to the pressure drop response state.

[0074] Specifically, the first pressure drop is an overflow outlet pressure drop, and the overflow outlet fluid pressure is recorded as the first pressure drop in the present application. The second pressure drop is an underflow port pressure drop, and the underflow port fluid pressure is recorded as the second pressure drop in the present application. The first preset pressure drop state is that the first pressure drop is less than the second pressure drop, and the second preset pressure drop state is that the first pressure drop is greater than or equal to the second pressure drop. In the trial adjustment, the pulse voltage is increased, and the increase amount is 200 V.

[0075] Specifically, the pressure drop response state includes a first pressure drop response state in which the first pressure drop rises and the second pressure drop falls, and a second pressure drop response state in which the first pressure drop rises and the second pressure drop rises.

[0076] Specifically, if the first pressure drop falls, the data analysis unit sends fault detection information to the user.

[0077] Specifically, in the first pressure drop response state, the inlet flow is increased, and in the second pressure drop response state, the pulse voltage is increased.

[0078] Specifically, the increase amount of the inlet flow is positively correlated with the dewatering reference value, and the increase amount of the pulse voltage is positively correlated with the dewatering reference value.

[0079] So far, the technical solutions of the present application have been described in combination with the preferred embodiments shown in the drawings, but those skilled in the art can easily understand that the protection scope of the present application is obviously not limited to these specific embodiments. Those skilled in the art can make equivalent changes or replacements to the related technical features without departing from the principles of the present application, and the technical solutions after the changes or replacements will fall within the protection scope of the present application.

[0080] The above description is only the preferred embodiments of the present application and is not intended to limit the present application; for those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A high-voltage pulsed electric field based hydrocyclone coupled demulsification separation system, characterized in that, The application relates to an emulsion oil wastewater treatment system. The emulsion oil wastewater treatment system comprises an emulsion separation unit, a data acquisition unit, a pretreatment unit and a data analysis unit. The emulsion separation unit comprises a plurality of electric field cyclone demulsification devices for demulsifying and dewatering target emulsion oil wastewater through cyclone and spiral electric field. The data acquisition unit is connected with the emulsion separation unit and is used for acquiring demand information. The pretreatment unit is connected with the data acquisition unit and the emulsion separation unit, is used for detecting an initial water content of the target emulsion oil wastewater, and selects a pretreatment mode according to the initial water content. The data analysis unit is connected with the data acquisition unit and the emulsion separation unit, is used for detecting a dewatering state, and determines an analysis adjustment mode according to the dewatering state. The electric field cyclone demulsification device is in a cylindrical shape, comprises a water inlet area, a coalescence area, a separation area and a water outlet area from top to bottom, the coalescence area is provided with a spiral electrode, the spiral electrode is connected with a pulse power supply, the pulse power supply supplies power to the spiral electrode, the separation area is provided with an overflow pipe, the overflow pipe is connected with an overflow outlet, and the target emulsion oil wastewater rotates in the coalescence area. The pretreatment unit comprises a plurality of pretreatment devices, and the pretreatment devices are respectively a temperature rising device, a centrifugal dewatering device and a sedimentation device. The demand information comprises a water content, an impurity content, a water content of demulsified and dewatered emulsion oil, a first pressure drop and a second pressure drop of the target emulsion oil wastewater. The initial water content comprises a first preset initial water content, a second preset initial water content and a third preset initial water content. The first preset initial water content is that the water content of the target emulsion oil wastewater without demulsification and dewatering is greater than 10% and less than or equal to 20%. The second preset initial water content is that the water content of the target emulsion oil wastewater without demulsification and dewatering is greater than 20% and less than or equal to 30%. The third preset initial water content is that the water content of the target emulsion oil wastewater without demulsification and dewatering is greater than 30%. The first treatment mode is used for heating the target emulsion oil wastewater by using the temperature rising device. The second treatment mode changes the conveying direction of the target emulsion oil wastewater. The third treatment mode is used for pre-dewatering the target emulsion oil wastewater by using the centrifugal dewatering device. If the dewatering state is in the first preset dewatering state, the data analysis unit determines to detect the impurity content reference value, the first preset dewatering state is that the dewatering reference value is in the preset dewatering reference value range and the dewatering stability is less than the preset dewatering stability, if the impurity content reference value is in the first preset impurity content reference value range, the data analysis unit determines to adjust the settling time, if the impurity content reference value is in the second preset impurity content reference value range, the data analysis unit determines to adjust the inlet flow; if the dewatering state is in the second preset dewatering state, the data analysis unit determines to adjust the dewatering parameter, the second preset dewatering state is that the dewatering reference value is in the dewatering reference value range to be adjusted; Wherein, the impurity content reference value = the absolute value of the difference between the maximum impurity content and the minimum impurity content detected in the last monitoring period / the target emulsified oil wastewater volume dewatered in a single monitoring period; The data analysis unit counts the water content Hi in each monitoring period once per monitoring period, Hi is the water content of the target emulsified oil wastewater dewatered by the demulsification separation unit in the i-th detection in the monitoring period, and the calculation formula of the dewatering reference value H0 is: ； The formula for calculating the dehydration stability H is: ; Wherein, n is the total number of detections of the water content of the target emulsified oil wastewater dewatered by the demulsification separation unit in a single monitoring period; In the adjustment of the dewatering parameter, the data analysis unit detects the first pressure drop and the second pressure drop to determine the pressure drop state, the first preset pressure drop state is that the first pressure drop is less than the second pressure drop, the second preset pressure drop state is that the first pressure drop is greater than or equal to the second pressure drop, if the pressure drop state is the first preset pressure drop state, the data analysis unit determines to increase the pulse voltage, if the pressure drop state is the second preset pressure drop state, the data analysis unit determines to adjust the pulse voltage and determines to adjust the pulse voltage or the inlet flow according to the pressure drop response state, the pressure drop response state includes the first pressure drop response state that the first pressure drop rises and the second pressure drop drops, and the second pressure drop response state that the first pressure drop rises and the second pressure drop rises, in the first pressure drop response state, the inlet flow is increased, in the second pressure drop response state, the pulse voltage is increased.

2. The high-voltage pulsed electric field based hydrocyclone coupled demulsification separation system of claim 1, wherein, A flow stabilizing cone is arranged in the water inlet area, the target emulsified oil wastewater flows into the coalescence area from the outer surface of the flow stabilizing cone, the spiral electrode is wrapped with an insulating material, when power is supplied, the electric field generated by the spiral electrode is applied to the flow field of the target emulsified oil wastewater, so that the water droplets of the target emulsified oil wastewater are polarized and oscillate and coalesce.

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