Crude oil dehydration device capable of detecting water content on line

Abstract

The invention discloses a crude oil dehydration device capable of detecting water content on line. The device comprises a dehydration kettle, a liquid inlet is formed in the top of the dehydration kettle, a demulsifier adding opening is formed in the side wall of the dehydration kettle, and a liquid outlet is formed in the bottom of the dehydration kettle; a stirring paddle is arranged in the dehydration kettle; a microwave generator, an ultrasonic assembly and a temperature sensor are arranged on the side wall of the dehydration kettle; wherein the dehydration kettle is also provided with a moisture content detection assembly which is used for carrying out online detection on the moisture content of the oil product in the dehydration kettle. According to the crude oil dehydration device, water-containing crude oil is heated and demulsified through the synergistic effect of microwaves and ultrasound, meanwhile, the water content can be detected on line, self-cleaning of the water content detection device can be carried out, and then controllable and efficient dehydration of the water-containing crude oil is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of crude oil dehydration, and in particular relates to a crude oil dehydration device capable of online detecting water content. Background Art

[0002] As oilfield development gradually enters the middle and late stages, the comprehensive water content of produced fluid continues to rise. Under the action of flow shear, the water in the produced fluid will be dispersed in the crude oil in the form of droplets to form an oil-in-water emulsion. The oil-in-water emulsion is lifted to the ground and then enters the oilfield gathering pipeline. After being transported through the pipeline, it enters the joint station for dehydration. In order to ensure that the water content of the exported crude oil meets the standard, traditional methods such as thermochemical demulsification and electric field demulsification are usually used, and gravity sedimentation is used to complete the dehydration of crude oil. However, for crude oil with high content of heavy components and high mineralization, this process has the following problems: 1) When the content of heavy components such as colloids and asphaltene is high, on the one hand, the crude oil density will be larger and the oil-water density difference will be smaller, which is not conducive to the gravity sedimentation process. On the other hand, the crude oil viscosity will be larger, which is not conducive to the migration and aggregation of emulsion droplets; 2) High mineralization can easily lead to electrode breakdown, resulting in failure of the dehydration device. The above problems will seriously affect the dehydration efficiency of the crude oil dehydration device, and even cause the water content of the exported crude oil to fail to meet the standard.

[0003] With the continuous deepening of research on crude oil dehydration, microwaves and ultrasound are gradually being used in crude oil dehydration. On the one hand, microwaves can heat crude oil through thermal effects, and the heating is uniform and fast, which is more environmentally friendly than traditional heating methods; on the other hand, the non-thermal effect of microwaves can promote the aggregation of droplets by reducing the Zeta potential of the emulsion. At the same time, the resonance of hydrocarbon molecules under the action of high-frequency microwaves can cause the molecular bonds to break, resulting in the decomposition of macromolecules of heavy components such as colloids and asphaltene into small molecules, thereby reducing density and viscosity, and ultimately promoting oil-water separation. Ultrasound can promote the aggregation of emulsion droplets through the displacement effect generated by mechanical vibration, thereby improving the dehydration efficiency. Therefore, it is of great significance to develop a microwave combined with ultrasound crude oil dehydration device suitable for crude oil with high heavy component content and mineralization, and give full play to the synergistic effect between microwaves and ultrasound, which is of great significance to improving the dehydration efficiency.

[0004] At present, patent CN110184088A discloses a crude oil dehydration device and method using ultrasound combined with electric field, which improves the crude oil dehydration efficiency by mainly using electric dehydration and supplemented by ultrasound. However, this method still has the following shortcomings: 1) There is a risk of electric field failure when facing crude oil with high mineralization; 2) There are problems such as uneven heating and large temperature gradient in the tank when heating crude oil with a heating insulation layer; 3) The dehydration tank in the patent is equipped with multiple sampling ports, and the water content is measured under different parameters and time after sampling, but this method is relatively cumbersome, and sampling and water content measurement need to be carried out separately, lacking online real-time detection of water content; 4) The patent is provided with an emulsification mixing tank (for emulsion preparation) and a dehydration tank, the structure is relatively complex, and there is a lack of a dehydration kettle that can simultaneously realize the two functions of emulsification and dehydration. Summary of the invention

[0005] 1. Technical issues to be resolved The purpose of the present invention is to provide a crude oil dehydration device capable of online detection of water content, which heats and demulsifies the water-containing crude oil through the synergistic effect of microwaves and ultrasound, and can simultaneously detect the water content online and perform self-cleaning of the water content detection device, thereby achieving controllable and efficient dehydration of the water-containing crude oil.

[0006] (II) Technical solution According to a first aspect of the present invention, the present invention provides a crude oil dehydration device.

[0007] The crude oil dehydration device capable of online water content detection of the present invention comprises a dehydration kettle; a liquid inlet is arranged on the top of the dehydration kettle, a demulsifier addition port is arranged on the side wall of the dehydration kettle, and a liquid discharge port is arranged on the bottom of the dehydration kettle; a stirring paddle is arranged inside the dehydration kettle; a microwave generator, an ultrasonic component, and a temperature sensor are arranged on the side wall of the dehydration kettle; wherein the dehydration kettle is also provided with a water content detection component, which is used for online detection of the water content of the oil in the dehydration kettle.

[0008] Furthermore, the moisture content detection component is an online moisture content detection component with a self-cleaning function. The moisture content detection component includes a self-cleaning chamber, an online moisture content detector located in the self-cleaning chamber, and an electric opening and closing device arranged on the wall of the self-cleaning chamber. The self-cleaning chamber has a cleaning agent inlet and a cleaning agent outlet.

[0009] Furthermore, the moisture content online detection component also includes a cleaning agent kettle, a flow meter, a transparent window, a waste liquid kettle, a cleaning agent regenerator, a cleaning agent injection metering pump, a cleaning agent regeneration metering pump, a cleaning agent recovery metering pump, a cleaning agent discharge solenoid valve, and a waste liquid discharge solenoid valve located outside the dehydration kettle. The cleaning agent kettle outlet is connected to the cleaning agent inlet through a pipeline and a cleaning metering pump in turn. The cleaning agent outlet is connected to the waste liquid kettle through a pipeline and a transparent window. The waste liquid kettle is connected to the cleaning agent regenerator through a pipeline, and the cleaning agent regenerator is connected to the inlet of the cleaning agent kettle. The transparent window is used to observe the color of the cleaning agent after self-cleaning to determine whether the online detector is clean.

[0010] Furthermore, the ultrasonic component includes an ultrasonic generator and an ultrasonic transducer.

[0011] Furthermore, the crude oil dehydration device also includes a computer control system. The magnetic stirring system, microwave generator, ultrasonic component, temperature sensor, and water content online detection component with self-cleaning function are all connected to the computer control system.

[0012] Furthermore, the crude oil dehydration device also includes a magnetic stirring system, which is connected to the stirring paddle inside the dehydration kettle. The magnetic stirring system is installed on the top of the dehydration kettle, and includes a stirring bar, an external magnetic card, an external magnetic block, a stirring motor, a ceramic bearing and a speed regulating device.

[0013] Furthermore, the liquid inlet can be filled with crude oil and water two-phase liquid, or emulsion, and the liquid inlet is sealed after the liquid is filled.

[0014] Furthermore, the demulsifier addition port can be used to add any type of demulsifier, without limiting the demulsifier composition.

[0015] Furthermore, the liquid discharge port can discharge the demulsified water and oil in sequence.

[0016] Furthermore, the outer wall of the dehydration kettle is coated with a thermal insulation layer.

[0017] Furthermore, the speed of the magnetic stirring system is adjustable within the range of 0 to 20,000 rpm. At a high speed (>50 rpm), the oil and water two-phase liquids added to the dehydration kettle can be stirred and emulsified to prepare an emulsion to be dehydrated; at a low speed (<50 rpm), the emulsion and the demulsifier can be stirred and mixed after the demulsifier is added to ensure uniform mixing.

[0018] Furthermore, the number of the microwave generators is an even number, preferably 2 to 6. The even number of microwave generators are evenly and symmetrically installed on the side wall of the dehydration kettle. The output power and time of the microwave generator can be adjusted by the computer control system.

[0019] Furthermore, the output power, frequency and time of the ultrasonic component can be adjusted by the computer control system.

[0020] Furthermore, the moisture content online detector in the moisture content online detection assembly and the self-cleaning chamber form an angle of 30-60° with the wall of the dehydration kettle, so that the liquid with moisture content to be tested in the dehydration kettle can quickly flow into the self-cleaning chamber under the action of gravity for moisture content detection.

[0021] Furthermore, the water content online detection component can be installed in multiple quantities, at least one of which is installed at the kettle wall corresponding to the axial center of the dehydration kettle, for online detection of the water content of the liquid in the dehydration kettle during the emulsion preparation process and the dehydration process.

[0022] Furthermore, when the online moisture content detection component with self-cleaning function installed at the kettle wall corresponding to the axial center of the dehydration kettle is used for moisture content detection in the emulsion preparation process, at a certain stirring speed, when the moisture content measurement value tends to be stable over time, the emulsion has reached a uniformly emulsified state.

[0023] Furthermore, when the moisture content online detection component with self-cleaning function installed at the kettle wall corresponding to the axial center of the dehydration kettle is used for moisture content detection during the dehydration process, under a certain microwave generator output power and ultrasonic component output power and frequency, when the moisture content measurement value tends to be stable over time, the emulsion has been dehydrated.

[0024] Furthermore, the temperature sensor can measure the liquid temperature in the dehydration kettle in real time, and complete the control of the liquid temperature in the dehydration kettle together with the microwave generator under the control of the computer control system. When the liquid temperature is lower than the set value, the microwave generator is started to heat the liquid; when the liquid temperature is higher than the set value, the microwave generator is turned off to stop heating the liquid.

[0025] According to a second aspect of the present invention, the present invention provides a crude oil dehydration method, wherein the crude oil dehydration device described above is applied.

[0026] (III) Beneficial effects 1. The present invention combines the advantages of microwave and ultrasonic dehydration methods. First, the thermal effect of microwaves can replace the traditional heating method to heat the liquid to be dehydrated. At the same time, the non-thermal effect of microwaves can reduce the Zeta potential of the emulsion and promote the decomposition of macromolecules such as colloids and asphaltene into small molecules, further reduce the density and viscosity, and promote the aggregation of emulsion droplets. Secondly, ultrasound is superimposed under the action of microwaves, and the displacement effect of ultrasound is used to further promote the aggregation of droplets. The synergistic effect of the two technologies can effectively improve the dehydration efficiency and improve the adaptability of the dehydration device to crude oil with high heavy component content and salt content.

[0027] 2. The present invention can complete emulsion preparation and emulsion dehydration in the same dehydration kettle, without the need to add an emulsion preparation device, and the structure is more compact and efficient.

[0028] 3. The present invention can realize the online detection of the water content of crude oil in the dehydration kettle, can be used to detect the uniformity of oil-water emulsification during the emulsion preparation process, can evaluate the dehydration effect in real time during the dehydration process, and can provide real-time guidance for the setting of parameters such as dehydration time, microwave frequency, power, and ultrasonic frequency, power, etc. At the same time, the water content online detection component has a self-cleaning function, which can complete self-cleaning in the interval of water content data collection to ensure the accuracy of the measurement results.

[0029] 4. In the process of heating crude oil by microwave, the present invention has a higher degree of heating uniformity and a faster heating speed, which is more environmentally friendly than traditional heating methods.

[0030] 5. The present invention is provided with a demulsifier dosing port. Under the same conditions of controlling the dehydration time, microwave frequency, power, ultrasonic frequency, power and other parameters, combined with the water content online detection component, the effect evaluation of different demulsifiers can be carried out. At the same time, the magnetic stirring system provided in the present invention can stir the demulsifier and the emulsion to be dehydrated at a low speed to ensure that the demulsifier is evenly dispersed in the emulsion and give full play to the demulsifier effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic structural diagram of a crude oil dehydration device according to an embodiment of the present invention.

[0032] The digital marks correspond to: 1-dehydration kettle; 2-liquid inlet; 3-emulsifier addition port; 4-liquid discharge port; 5-insulation layer; 6-magnetic stirring system; 7-stirring paddle; 8-microwave generator; 9-ultrasonic transducer; 10-ultrasonic generator; 11-moisture content online detection component with self-cleaning function; 12-temperature sensor; 13-computer control system.

[0033] Figure 2 It is a schematic diagram of the structure of an online moisture content detection component in an embodiment of the present invention.

[0034] The digital marks correspond to: 11-1-online moisture content detector; 11-2-self-cleaning chamber; 11-3-electric opening and closing device; 11-4-cleaning agent kettle; 11-5-cleaning agent injection metering pump; 11-6-flow meter; 11-7-transparent window; 11-8-waste liquid kettle; 11-9-cleaning agent regeneration metering pump; 11-10-cleaning agent regenerator; 11-11-cleaning agent recovery metering pump; 11-12-cleaning agent discharge solenoid valve; 11-13-waste liquid discharge solenoid valve; 11-14-cleaning agent inlet; 11-15-cleaning agent outlet. Implementation

[0035] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0036] like Figure 1 As shown, the main body for realizing the dehydration function in this embodiment is the dehydration kettle 1, which is made of stainless steel and will not chemically react with the liquid and demulsifier in the dehydration kettle 1.

[0037] The top of the dehydration kettle 1 is provided with a liquid inlet 2, and liquid can be added into the dehydration kettle through the liquid inlet 2. The dehydration kettle 1 can be used to prepare the emulsion first and then dehydrate the emulsion, or it can be used to directly dehydrate the emulsion. When the dehydration kettle 1 is used to prepare the emulsion, water and oil two-phase liquids are added from the liquid inlet 2 in a predetermined ratio. When the dehydration kettle 1 is used to directly dehydrate the emulsion, the emulsion to be dehydrated is directly added from the liquid inlet 2. The liquid inlet 2 needs to be sealed after the liquid is added.

[0038] The side wall of the dehydration kettle 1 is provided with a demulsifier addition port 3, and before the emulsion is dehydrated, a demulsifier of a predetermined concentration can be added through the demulsifier addition port 3. The demulsifier addition port 3 needs to be sealed after the demulsifier is added.

[0039] The bottom of the dehydration kettle 1 is provided with a drain port 4 and a stop valve. When the dehydration is finished, the emulsion has been transformed into an oil-water two-phase liquid with a clear oil-water interface. Generally, the upper part of the dehydration kettle 1 is the oil phase and the lower part is the water phase. When draining, open the stop valve to drain the water phase and the oil phase in turn.

[0040] The outer wall of the dehydration kettle 1 is covered with a heat-insulating layer 5 for reducing the heat exchange between the high-temperature fluid in the dehydration kettle and the external environment.

[0041] A magnetic stirring system 6 is installed on the top of the dehydration kettle 1, and the magnetic stirring system includes a stirrer, an external magnetic card, an external magnetic block, a stirring motor, a ceramic bearing and a speed regulating device. Connected to the magnetic stirring system is a stirring paddle 7, which can be a four-blade paddle, and the paddles are installed at a position 2 / 3 of the height of the dehydration kettle 1 from the top of the dehydration kettle 1. The speed of the magnetic stirring system is adjustable within 0~20000rpm. When the dehydration kettle 1 is used to prepare an emulsion, according to the requirements of the emulsion preparation, the speed of the magnetic stirring system 6 is controlled to be >50rpm to stir the oil and water two-phase liquids. The stirring action can disperse the water phase in the oil phase in the form of droplets to form an emulsion. The higher the stirring speed, the smaller the droplet diameter. When the dehydration kettle 1 is used for dehydration, after the demulsifier is added from the demulsifier addition port 3, the speed of the magnetic stirring system 6 is controlled to be less than 50 rpm to stir the emulsion and the demulsifier, so that the demulsifier can be evenly dispersed in the emulsion, ensuring that the demulsifier can fully exert its demulsification effect, and at the same time, a lower speed will not change the droplet size of the emulsion.

[0042] Two microwave generators 8 are symmetrically installed on the side wall of the dehydration kettle 1, which can emit microwaves to the liquid in the dehydration kettle 1. On the one hand, microwaves are used to heat the liquid in the dehydration kettle 1. On the other hand, microwaves reduce the Zeta potential of the emulsion through its non-thermal effect, and promote the decomposition of macromolecules such as colloids and asphaltene into small molecules, further reducing the density and viscosity, making it easier for droplets to coalesce and settle. The output power and time of the microwave generator 8 can be adjusted according to the dehydration requirements.

[0043] The side wall of the dehydration kettle 1 is equipped with an ultrasonic component, including an ultrasonic generator 10 and an ultrasonic transducer 9. The ultrasonic transducer 9 is fixed on the kettle wall, and the ultrasonic generator is connected to the ultrasonic transducer. The ultrasonic transducer can convert the electric power input by the ultrasonic generator into ultrasonic waves and input them to the liquid in the dehydration kettle, so that the droplets continuously move to the nodes and antinodes, reduce the oil-water interface strength, accelerate the rupture of the interface film, and promote the collision and aggregation of the droplets. The output power, frequency and time of the ultrasonic component can be adjusted according to the dehydration requirements.

[0044] The dehydration kettle 1 is also provided with a moisture content detection component 11. Preferably, the moisture content online detection component 11 is arranged at the kettle wall corresponding to the axial center of the dehydration kettle.

[0045] like Figure 2 As shown, the moisture content online detection component with self-cleaning function includes an online moisture content detector 11-1, a self-cleaning chamber 11-2, an electric opening and closing device 11-3, a cleaning agent kettle 11-4, a cleaning agent injection metering pump 11-5, a flow meter 11-6, a transparent window 11-7, a waste liquid kettle 11-8, a cleaning agent regeneration metering pump 11-9, a cleaning agent regenerator 11-10, a cleaning agent recovery metering pump 11-11, a cleaning agent discharge solenoid valve 11-12, a waste liquid discharge solenoid valve 11-13, a cleaning agent inlet 11-14, and a cleaning agent outlet 11-15.

[0046] The water content data measured by the water content online detector 11-1 in the water content online detection component 11 with a self-cleaning function can be used to measure the uniformity of the emulsion in the emulsion preparation process, and can also be used to reflect the dehydration effect of the dehydration process. When the dehydration kettle 1 is used to prepare the emulsion, after adding liquid into the dehydration kettle 1 according to the established oil-water two-phase ratio, if the liquid contacted by the water content online detector 11-1 is the water phase at this time, the water content measurement value is close to 100%, and as the magnetic stirring system 6 is turned on, the oil and water phases begin to mix and emulsify, and the water content measurement value gradually decreases and eventually stabilizes, indicating that a relatively uniform emulsion has been formed; if the liquid contacted by the water content online detector 11-1 is the oil phase at this time, the water content measurement value is close to 0%, and as the magnetic stirring system 6 is turned on, the oil and water phases begin to mix and emulsify, and the water content measurement value gradually increases and eventually stabilizes, indicating that a relatively uniform emulsion has been formed. When the dehydration kettle 1 is used to dehydrate the emulsion, the moisture content online detector 11-1 is used to detect the moisture content during the dehydration process. As the dehydration process proceeds, the moisture content measurement value will change with the increase of dehydration time. When the moisture content measurement value tends to be stable, the emulsion has been completely dehydrated.

[0047] The water content online detector 11-1 is a contact measurement, so the following problems will occur during the water content test of the actual crude oil system: when the probe part of the water content online detector 11-1 first contacts the liquid to be tested, it will immediately measure a water content value, but due to the high viscosity of crude oil, the probe part of the water content online detector 11-1 will be covered by the crude oil it contacts, resulting in the probe part being unable to contact the oil sample whose water content has changed in the dehydration kettle 1 (that is, the oil sample contacted by the probe part cannot be updated), and thus the water content value measured by the water content online detector 11-1 cannot reflect the actual water content of the liquid in the kettle in real time. To solve this problem, the present invention particularly provides a set of self-cleaning system for water content online detector.

[0048] The moisture content online detector 11-1 is installed at 45° in the kettle wall of the dehydration kettle 1. The probe extending into the kettle is covered by the cylindrical self-cleaning chamber 11-2. The upper part of the self-cleaning chamber 11-2 is provided with an electric opening and closing device 11-3, which can be controlled to be open or closed as needed. When it is open, the liquid in the kettle can enter the self-cleaning chamber 11-2 under the action of gravity, and when it is closed, the liquid in the self-cleaning chamber 11-2 can be isolated from the liquid in the kettle. When the moisture content measurement begins, the electric opening and closing device 11-3 is first controlled to be in the open state. At this time, the oil sample in the kettle will enter the self-cleaning chamber 11-2 and contact the probe part of the moisture content online detector 11-1, and then the moisture content value is measured. Subsequently, the electric opening and closing device 11-3 is controlled to be in the closed state to isolate the liquid in the self-cleaning chamber 11-2 from the liquid in the kettle, and the self-cleaning process begins. At this time, close the cleaning agent discharge solenoid valve 11-12, start the cleaning agent injection metering pump 11-5, and pump the organic cleaning agent such as petroleum ether stored in the cleaning agent kettle 11-4 into the self-cleaning chamber 11-2 through the flow meter 11-6 and the cleaning agent inlet 11-14 for cleaning. The mixture of cleaning agent and crude oil formed during the cleaning process enters the waste liquid kettle 11-8 through the cleaning agent outlet 11-15 and the transparent window 11-7. Since the cleaning agent is a colorless liquid, and the mixture of cleaning agent and crude oil is a colored liquid, it is possible to observe through the transparent window 11-7 whether the crude oil on the surface of the water content online detector 11-1 probe is clean. When the liquid observed in the transparent window 11-7 becomes colorless, it means that the probe has been cleaned. The mixture of cleaning agent and crude oil entering the waste liquid kettle 11-8 is pumped into the cleaning agent regenerator 11-10 for distillation through the cleaning agent regeneration metering pump 11-9. The cleaning agent obtained after distillation is pumped back to the cleaning agent kettle 11-4 through the cleaning agent recovery metering pump 11-11 for recycling. The waste oil generated by the cleaning agent regenerator 11-10 is discharged through the waste liquid discharge solenoid valve 11-13. After the cleaning is completed, the cleaning agent injection metering pump 11-5, the cleaning agent regeneration metering pump 11-9, and the cleaning agent recovery metering pump 11-11 are closed, and the cleaning agent discharge solenoid valve 11-12 is opened. Part of the cleaning agent in the self-cleaning chamber 11-2 flows back to the cleaning agent kettle 11-4 through the cleaning agent inlet 11-14 and the cleaning agent discharge solenoid valve 11-12, and the remaining cleaning agent in the self-cleaning chamber 11-2 enters the waste liquid kettle 11-8 through the cleaning agent outlet 11-15 and the transparent window 11-7. The cleaning agent is discharged from the self-cleaning chamber 11-2 to prevent it from mixing with the liquid in the kettle and thus changing the composition of the liquid in the kettle. Subsequently, the electric opening and closing device 11-3 is reopened to allow the liquid in the kettle to enter the self-cleaning chamber 11-2 and contact the probe of the moisture content online detector 11-1 to measure the next moisture content value.To ensure that the cleaning agent can be discharged from the self-cleaning chamber 11-2 under the action of gravity, the installation height of the cleaning agent kettle 11-4, the cleaning agent injection metering pump 11-5, the flow meter 11-6, the transparent window 11-7, the waste liquid kettle 11-8, the cleaning agent regeneration metering pump 11-9, the cleaning agent regenerator 11-10, the cleaning agent recovery metering pump 11-11, the cleaning agent discharge solenoid valve 11-12, and the waste liquid discharge solenoid valve 11-13 should be lower than the installation height of the moisture content online detector 11-1, the self-cleaning chamber 11-2, the electric opening and closing device 11-3, the cleaning agent inlet 11-14, and the cleaning agent outlet 11-15.

[0049] A temperature sensor 12 is installed on the wall of the dehydration kettle 1, which can be used to measure the temperature of the liquid in real time and control the liquid in the dehydration kettle at a constant temperature with the microwave generator 8. The computer control system 13 receives the temperature value measured by the temperature sensor 12 in real time and compares it with the temperature setting value. When the temperature measurement value is lower than the temperature setting value, the microwave generator 8 is controlled to emit microwaves to heat the liquid; when the temperature measurement value is higher than the temperature setting value, the microwave generator 8 is controlled to be turned off to stop heating the liquid.

Claims

1. A crude oil dehydration device capable of online detection of water content, characterized in that: It comprises a dehydration kettle; a liquid inlet is arranged on the top of the dehydration kettle, a demulsifier addition port is arranged on the side wall of the dehydration kettle, and a liquid discharge port is arranged on the bottom of the dehydration kettle; a stirring paddle is arranged inside the dehydration kettle; a microwave generator, an ultrasonic component and a temperature sensor are arranged on the side wall of the dehydration kettle; wherein the dehydration kettle is also provided with a water content detection component, which is used for online detection of the water content of the oil in the dehydration kettle.

2. The crude oil dehydration device according to claim 1, characterized in that: The moisture content detection component comprises a self-cleaning chamber, an online moisture content detector located in the self-cleaning chamber, and an electric opening and closing device arranged on the wall of the self-cleaning chamber; the self-cleaning chamber has a cleaning agent inlet and a cleaning agent outlet.

3. The crude oil dehydration device according to claim 2, characterized in that: The moisture content online detection component also includes a cleaning agent kettle, a flow meter, a transparent window, a waste liquid kettle, a cleaning agent regenerator, a cleaning agent injection metering pump, a cleaning agent regeneration metering pump, a cleaning agent recovery metering pump, a cleaning agent discharge solenoid valve, and a waste liquid discharge solenoid valve located outside the dehydration kettle; the cleaning agent kettle outlet is connected to the cleaning agent inlet through a pipeline and a cleaning metering pump in sequence; the cleaning agent outlet is connected to the waste liquid kettle through a pipeline and a transparent window; the waste liquid kettle is connected to the cleaning agent regenerator through a pipeline, and the cleaning agent regenerator is connected to the inlet of the cleaning agent kettle.

4. The crude oil dehydration device according to claim 1, characterized in that: The ultrasonic component includes an ultrasonic generator and an ultrasonic transducer.

5. The crude oil dehydration device according to claim 1, characterized in that: The crude oil dehydration device also includes a computer control system, and the magnetic stirring system, microwave generator, ultrasonic component, temperature sensor, and water content online detection component with self-cleaning function are all connected to the computer control system.

6. The crude oil dehydration device according to claim 1, characterized in that: The crude oil dehydration device also includes a magnetic stirring system, which is installed on the top of the dehydration kettle and connected to the stirring paddle inside the dehydration kettle.

7. The crude oil dehydration device according to claim 6, characterized in that: The magnetic stirring system comprises a stirring rod, an external magnetic card, an external magnetic block, a stirring motor, a ceramic bearing and a speed regulating device.

8. The crude oil dehydration device according to claim 1, characterized in that: The outer wall of the dehydration kettle is coated with a heat-insulating layer.

9. The crude oil dehydration device according to claim 1, characterized in that: The number of the microwave generators is an even number, preferably 2 to 6; the even number of microwave generators are evenly and symmetrically installed on the side wall of the dehydration kettle.

10. The crude oil dehydration device according to claim 2, characterized in that: The moisture content online detector and the self-cleaning chamber form an angle of 30-60° with the wall of the dehydration kettle.

11. The crude oil dehydration device according to claim 1, characterized in that: The temperature sensor can measure the temperature of the liquid in the dehydration kettle in real time, and control the temperature of the liquid in the dehydration kettle together with the microwave generator under the control of the computer control system.

12. A method for dehydrating crude oil, characterized in that: The crude oil dehydration device described in any one of claims 1 to 11 is used.

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