Impurity removing method and device in oil product conveying process

Abstract

The invention belongs to the technical field of liquid electrostatic risk prevention and control, and particularly relates to an impurity removing method and device in the oil product conveying process. The impurity removing device comprises a first connecting pipeline, a second connecting pipeline, a filter, a first reducing pipeline, a second reducing pipeline, an electrostatic moderator, a high-voltage power supply, an electrode plate, an impurity collector, an oil gas detector and a controller, wherein the first connecting pipeline and the second connecting pipeline are arranged at the two ends of the impurity removing device. The impurity removing device is installed on the oil product conveying pipeline through two connecting pipelines at the two ends. And the electrode plate is arranged in the static mitigator and is used for establishing an electric field in the oil to capture the static impurities. The impurity removing device provided by the invention can be used for collecting and removing impurities generated in the oil product conveying process, preventing the electrostatic problem caused by the impurities in the oil product conveying process, and avoiding the influence of water impurities on the oil product quality.

Description

Technical Field

[0001] This invention belongs to the field of liquid electrostatic risk prevention and impurity removal technology, specifically relating to a method and apparatus for removing impurities during oil transportation. Background Technology

[0002] During the storage and transportation of oil products, water impurities inevitably appear in storage tanks and pipelines. API RP2003-2015 points out that when oil contains water, static electricity problems are prone to occur. Furthermore, water in oil can lead to quality issues, and reports of vehicles failing to run properly after refueling due to water in the oil are common. Various factors, such as metal corrosion in the storage and transportation system and the shedding of anti-corrosion materials, can also cause solid impurities in the oil. Mixing oil products can introduce liquid impurities other than water. These solid and liquid impurities, while contributing to static electricity problems, also negatively impact oil quality.

[0003] To avoid impurities during oil transportation, companies primarily use filters. Patent CN201310259013.6 provides a vortex-type two-phase filter that creates a rotating vortex upon liquid entry into the housing, generating centrifugal force. This causes flocculent impurities to accumulate in the central area of ​​the liquid flow, concentrating them in the middle of the filter screen, thus reducing the clogging effect of flocculent substances on the large area of ​​the filter screen. Patent CN202121487927.4, through the weaving of filter cloth and filter paper, achieves the purpose of further filtering water and impurities from the oil after filtration. Patent CN 103977623 A uses barbed ionization rods to charge impurities, but this method is complex and only removes solid particulate impurities.

[0004] From the current technological perspective, it is basically impossible to solve the problem of ultrafine impurities and other liquid impurities besides water. Based on the above problems, there is an urgent need to propose a new method and device for removing impurities from oil. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a method and apparatus for removing impurities during oil transportation; used to collect and remove impurities that occur during oil transportation, prevent static electricity problems caused by impurities during oil transportation, and avoid the impact of impurities on oil quality.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: An impurity removal device for oil transportation process, the impurity removal device includes two connecting pipes, a first connecting pipe and a second connecting pipe, which are arranged at both ends of the impurity removal device, a filter, two reducing pipes, a first reducing pipe and a second reducing pipe, an electrostatic buffer, a high-voltage power supply, an electrode plate, an impurity collector, an oil and gas detector, and a controller. The impurity removal device is installed on the oil conveying pipeline through two connecting pipes at both ends; the first connecting pipe, the filter, the first reducing pipe, the electrostatic buffer, the second reducing pipe, and the second connecting pipe are connected in sequence; The filter is used to statically charge impurities in the oil. The diameter of the static electricity buffer is larger than the diameter of the oil conveying pipeline to reduce the movement speed of statically charged impurities. The number of electrode plates is two, and the two electrode plates are arranged in parallel inside the electrostatic buffer to establish an electric field in the oil to capture the electrostatically charged impurities; the electrode plates are connected to the high-voltage power supply located outside the electrostatic buffer. The oil and gas detector is located inside and above the electrostatic buffer to detect whether oil and gas are present in the electrostatic buffer; the oil and gas detector is a conventional instrument, specifically a YT02132-automotive gasoline octane number analyzer; the impurity collector is used to collect the impurities captured by the electrode plate; The high-voltage power supply and the oil and gas detector are both connected to the controller.

[0007] Furthermore, the impurity collector is installed at the lower part of the electrostatic buffer and is located below the electrode plate; the top of the impurity collector communicates with the interior of the electrostatic buffer; Furthermore, an impurity detector is installed in the impurity collector, and a valve is installed at the bottom of the impurity collector; the impurity detector is used to detect whether impurities have appeared in the impurity collector; the impurity detector is connected to the controller. Since most impurities in oil are water impurities, the impurity detector in this invention adopts a water impurity detector based on the principle of ultraviolet fluorescence detection or the different dielectric constants of oil and water, such as the IFW-2A oil trace moisture sensor; specifically, the impurity detector is located in the upper middle part of the impurity collector. When the impurity detector detects water impurities, it indicates that the impurity collector is almost full of impurities, and an alarm signal needs to be issued to remind the operator to clean the impurities.

[0008] The valve is installed at the bottom of the impurity collector, at the lowest point of the impurity collector; when the impurity detector alarms, the valve is opened to remove the impurities.

[0009] Furthermore, the filter charges impurities flowing through it through a small pore size, with the pore size not exceeding 2000 μm. The filter material is made of paper, synthetic fiber, or metal. In this invention, controlling the pore size to not exceed 2000 μm allows the charge to be more than ten times higher than before filtration; for example, the potential difference before and after using a paper filter element can be a hundred times; and the smaller the filter pore size, the higher the static electricity.

[0010] Furthermore, the electrostatic buffer is a cylindrical pipe, and the diameter of the electrostatic buffer is 1.2-10 times the diameter of the oil conveying pipe. The cylindrical shape of the electrostatic buffer helps prevent the adhesion of impurities.

[0011] The diameter of the electrostatic buffer is larger than that of the pipe, which can reduce the flow rate of the oil and thus reduce the flow rate of charged impurities in the oil. This makes the movement of charged impurities more susceptible to the influence of the electric field. At the same time, the electrostatic buffer also plays a role in dissipating static electricity (the principle is: static electricity is eliminated by increasing the residence time. As the diameter of the buffer increases, the flow rate decreases, and the static electricity dissipates after a longer residence time).

[0012] The relationship between the oil flow rate in the electrostatic buffer and the oil flow rate in the oil delivery pipeline can be calculated using the following formula based on the pipeline inner diameter and the electrostatic buffer inner diameter: ; In the formula: V1 is the oil flow rate in the electrostatic buffer; V0 is the oil flow rate in the oil delivery pipeline; d is the inner diameter of the oil delivery pipeline; D is the inner diameter of the electrostatic buffer.

[0013] Furthermore, the electrode plate is made of polished metal, specifically, the polished metal in the guide groove area does not have sand pits with a diameter exceeding 0.2 mm.

[0014] The electrode plate is rectangular or square; the metal used for the electrode plate has been polished to facilitate the flow of water impurities. The electrode plate should be made of corrosion-resistant material, such as 304 stainless steel, copper, gold, or 316 stainless steel. The four corners of the electrode plate are smoothed (i.e., the four corners of the electrode plate are all rounded) to avoid corona discharge when the high voltage power supply applies high voltage to the electrode plate, which would affect the establishment of the electric field in the oil; specifically, the radius of the rounded arc at the four corners is greater than or equal to 3mm. The two electrode plates are insulated from each other and are installed on both sides inside the electrostatic buffer, located at the front end of the electrostatic buffer (i.e., the end of the electrostatic buffer near the filter). They are used to establish an electric field in the oil, causing charged impurities to move in the electric field and be captured by the electrode plates.

[0015] The other end of the electrostatic buffer is used to mitigate static electricity in the oil, preventing the filter and electrode plates from affecting the static electricity of the oil. High-voltage electrodes and filters can cause the oil to become charged; therefore, electrostatic control measures are necessary to avoid electrostatic risks.

[0016] Furthermore, the high-voltage power supply is controlled by the controller, and the high-voltage power supply is used to output a high voltage on the electrode plate, the high voltage being in the range of 5kV-100kV.

[0017] Furthermore, the controller receives oil delivery signals from the pipeline and alarm signals from the oil and gas detector; the oil delivery signals are specifically the oil delivery signals from the oil spill protector or the oil delivery signals from the submersible pump; the oil delivery signals include pipeline oil delivery start signals and pipeline oil delivery stop signals. When the controller receives a signal to start pipeline oil transportation and does not receive an alarm signal from the oil and gas detector, it controls the high-voltage power supply to output high voltage and apply the voltage to the electrode plates to begin removing impurities. When the controller receives a signal indicating that the pipeline has stopped delivering oil or receives an alarm signal from the oil and gas detector, it controls the high-voltage power supply to stop outputting high voltage.

[0018] Furthermore, the controller is connected to an impurity detector. When an impurity is detected, it outputs an alarm signal to remind the operator to clean the impurity.

[0019] A method for removing impurities during oil transportation involves using the impurity removal device to electrostatically charge the impurities and then using an electric field to capture the charged impurities, thereby achieving the removal of impurities from the oil.

[0020] Beneficial technical effects of the present invention: The impurity removal device for oil transportation provided by the present invention uses a filter to electrostatically charge impurities, and an electrostatic buffer to reduce the movement speed of the charged impurities, making them easier to capture by the charged electrode plate. This achieves the elimination of impurities, especially liquid impurities, prevents electrostatic problems caused by impurities during oil transportation, and avoids the impact of impurities on oil quality.

[0021] The impurity removal device provided by the present invention can remove impurities including water impurities and solid ultrafine impurities with a particle size of less than 2000 μm. The solid ultrafine impurities are made of materials including rust, ferrous oxide, and composite materials. Attached Figure Description

[0022] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0023] Figure 1 This is a schematic diagram of an impurity removal device in the oil transportation process according to an embodiment of the present invention; Reference numerals: 1-Connecting pipe, 2-Filter, 3-Static buffer, 4-Reducing pipe, 5-High voltage power supply, 6-Electrode plate, 7-Impurity collector, 8-Impurity detector, 9-Valve, 10-Oil and gas detector, 11-Controller. Detailed Implementation

[0024] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0025] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0026] In this invention, terms such as "upper," "lower," "bottom," and "top" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are merely relational terms determined for the convenience of describing the structural relationship of the various components or elements of this invention, and do not specifically refer to any component or element in this invention, and should not be construed as limiting this invention.

[0027] In this invention, terms such as "connected" and "linked" should be interpreted broadly, indicating a fixed connection, an integral connection, or a detachable connection; a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can determine the specific meaning of these terms in this invention based on the specific circumstances, and they should not be construed as limitations on the invention.

[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0029] Experimental studies in the field of electrostatics have shown that oil containing impurities has high charging characteristics. In particular, the charging capacity of oil increases by tens of times after passing through a filter. Charged particles will move towards the electrode with opposite polarity under the action of an electric field. This invention achieves the removal of impurities by utilizing the above physical laws.

[0030] Example 1: As Figure 1The impurity removal device shown includes two connecting pipes 1 (first connecting pipe and second connecting pipe), a filter 2, an electrostatic buffer 3, two reducing pipes 4 (first reducing pipe and second reducing pipe), a high-voltage power supply 5, an electrode plate 6, an impurity collector 7, an impurity detector 8, a valve 9, an oil and gas detector 10, and a controller 11.

[0031] The impurity removal device is installed on the oil conveying pipeline through two connecting pipes at both ends; the first connecting pipe, the filter 2, the first reducing pipe, the electrostatic buffer 3, the second reducing pipe and the second connecting pipe are connected in sequence; The inner diameters of the first and second reducing pipes are 100mm. The filter 2 is installed in front of the electrostatic buffer 3, and its filter pore size is 40μm; The electrostatic buffer 3 is connected to the connecting pipe through a reducing pipe. The inner diameter of the electrostatic buffer is 200mm. The oil flow rate in the electrostatic buffer 3 is reduced to 1 / 4 of the oil flow rate in the pipe 1. The oil flow rate in the pipe is 4m / s, and the oil flow rate in the electrostatic buffer is 1m / s. The high-voltage power supply 5 is a DC power supply, which can apply a DC voltage of +6000V and -6000V to the two plates of the electrode plate 6 respectively. Polishing the metal of the electrode plate 6 (so that there are no sand pits with a diameter greater than 0.2 mm on the surface of the electrode plate) helps the movement of impurities. The impurity collector 7 is located below the electrode plate 6 and is used to collect impurities on the electrode plate. The impurity detector 8 is located on top of the impurity collector 7, and outputs an alarm signal to the controller 11 when an impurity is detected. The valve 9 is located at the bottom of the impurity collector 7. When the controller 11 receives the alarm signal from the impurity detector 8, it outputs an alarm signal to remind the operator to remove the impurities in the impurity collector through the valve 9. The oil and gas detector 10 is installed inside the electrostatic buffer 3, located above the electrode plate 6, and is used to detect whether the electrostatic buffer is full of oil. When oil and gas are detected, an alarm signal is output to the controller 11. The controller 11 receives signals from the impurity detector 8. When it receives a signal that the impurity detector has detected impurities, it outputs an alarm signal to remind the staff to remove the impurities. The controller 11 receives the oil delivery signal and the signal from the oil and gas detector 10. When it receives the oil delivery start signal and the oil and gas detector 10 has no alarm signal, it controls the high-voltage power supply 5 to apply a DC voltage of +6000V and -6000V to the electrode plate. When the controller 11 receives an oil supply stop signal or an alarm signal from the oil and gas detector 10, it controls the high-voltage power supply 5 to stop outputting DC voltage.

[0032] Example 2: An impurity removal device in the oil transportation process, comprising a connecting pipe 1, a filter 2, an electrostatic buffer 3, a reducing pipe 4, a high-voltage power supply 5, an electrode plate 6, an impurity collector 7, an impurity detector 8, a valve 9, an oil and gas detector 10, and a controller 11.

[0033] Connecting pipe 1 is used to connect the impurity removal device to the oil storage and transportation system, and its inner diameter is 80mm. The filter 2 is installed in front of the electrostatic buffer 3, and its pore size is 20μm; The electrostatic buffer 3 is connected to the connecting pipe through a reducing pipe 4 with an inner diameter of 400mm. The oil flow rate in the electrostatic buffer 3 is reduced to 1 / 25 of the oil flow rate in the pipe 1. The oil flow rate in the pipe is 5m / s, and the oil flow rate in the electrostatic buffer is 0.2m / s. The high-voltage power supply 5 is a DC power supply, which can apply a DC voltage of +8000V and -8000V to the two plates of the electrode plate 6 respectively. Polishing the metal of the electrode plate 6 (so that there are no sand pits with a diameter greater than 0.2 mm on the surface of the electrode plate) helps the movement of impurities. The impurity collector 7 is located below the electrode plate 6 and is used to collect impurities on the electrode plate. The impurity detector 8 is located on top of the impurity collector 7, and outputs an alarm signal to the controller 11 when an impurity is detected. The valve 9 is located at the bottom of the impurity collector 7. When the controller 11 receives the alarm signal from the impurity detector 8, it outputs an alarm signal to remind the operator to remove the impurities in the impurity collector through the valve 9. The oil and gas detector 10 is installed inside the electrostatic buffer 3, located above the electrode plate 6, and is used to detect whether the electrostatic buffer is full of oil. When oil and gas are detected, an alarm signal is output to the controller 11. The controller 11 receives signals from the impurity detector 8. When it receives a signal that the impurity detector has detected impurities, it outputs an alarm signal to remind the staff to remove the impurities. The controller 11 receives the oil delivery signal and the signal from the oil and gas detector 10. When it receives the oil delivery start signal and the oil and gas detector 10 has no alarm signal, it controls the high-voltage power supply 5 to apply a DC voltage of +8000V and -8000V to the electrode plate. When the controller 11 receives an oil supply stop signal or an alarm signal from the oil and gas detector 10, it controls the high-voltage power supply 5 to stop outputting DC voltage.

[0034] Example 3: An impurity removal device for oil transportation includes a connecting pipe 1, a filter 2, an electrostatic buffer 3, a reducing pipe 4, a high-voltage power supply 5, an electrode plate 6, an impurity collector 7, an impurity detector 8, a valve 9, an oil and gas detector 10, and a controller 11.

[0035] Connecting pipe 1 is used to connect the impurity removal device to the oil storage and transportation system, and its inner diameter is 80mm. The filter 2 is installed in front of the electrostatic buffer 3, and its pore size is 10μm; The electrostatic buffer 3 is connected to the connecting pipe through the reducing pipe 4, which has an inner diameter of 400mm. It can be seen that the oil flow rate in the electrostatic buffer 3 is reduced to 1 / 25 of the oil flow rate in the pipe 1. The oil flow rate in the pipe is 5m / s, and the oil flow rate in the electrostatic buffer is 0.2m / s. The high-voltage power supply 5 is an AC power supply, and can provide an effective AC voltage of 8000V on the two plates of the electrode plate 6. Polishing the metal of the electrode plate 6 (so that there are no sand pits with a diameter greater than 0.2 mm on the surface of the electrode plate) helps the movement of impurities. The impurity collector 7 is located below the electrode plate 6 and is used to collect impurities on the electrode plate. The impurity detector 8 is located on top of the impurity collector 7, and outputs an alarm signal to the controller 11 when an impurity is detected. The valve 9 is located at the bottom of the impurity collector 7. When the controller 11 receives the alarm signal from the impurity detector 8, it outputs an alarm signal to remind the operator to remove the impurities in the impurity collector through the valve 9. The oil and gas detector 10 is installed inside the electrostatic buffer 3, located above the electrode plate 6, and is used to detect whether the electrostatic buffer is full of oil. When oil and gas are detected, an alarm signal is output to the controller 11. The controller 11 receives signals from the impurity detector 8. When it receives a signal that the impurity detector has detected impurities, it outputs an alarm signal to remind the staff to remove the impurities. The controller 11 receives the oil delivery signal and the signal from the oil and gas detector 10. When it receives the oil delivery start signal and the oil and gas detector 10 has no alarm signal, it controls the high-voltage power supply 5 to apply an AC voltage with an effective value of 8000V to the electrode plate. When the controller 11 receives an oil supply stop signal or an alarm signal from the oil and gas detector 10, it controls the high-voltage power supply 5 to stop outputting DC voltage.

[0036] This invention provides a method for removing impurities during oil transportation. By using a filter to electrostatically charge impurities and using an electrostatic depressor to reduce the movement speed of the charged impurities, they can be easily captured by charged electrode plates. This method eliminates impurities, especially liquid impurities, prevents electrostatic problems caused by impurities during oil transportation, and avoids the impact of impurities on oil quality.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for removing impurities during oil transportation, characterized in that, The impurity removal device includes two connecting pipes (1) with a first connecting pipe and a second connecting pipe at both ends of the impurity removal device, a filter (2), two reducing pipes (4) with a first reducing pipe and a second reducing pipe, an electrostatic buffer (3), a high voltage power supply (5), an electrode plate (6), an impurity collector (7), an oil and gas detector (10), and a controller (11). The impurity removal device is installed on the oil conveying pipeline through two connecting pipes at both ends; the first connecting pipe, the filter (2), the first reducing pipe, the electrostatic buffer (3), the second reducing pipe and the second connecting pipe are connected in sequence; The filter (2) is used to make the impurities in the oil statically charged; The diameter of the static electricity buffer (3) is larger than the diameter of the oil conveying pipeline in order to reduce the movement speed of statically charged impurities. The number of electrode plates (6) is two, and the two electrode plates are arranged in parallel inside the electrostatic buffer (3) to establish an electric field in the oil to capture the electrostatic impurities; the electrode plates (6) are connected to the high voltage power supply (5) located outside the electrostatic buffer (3); The oil and gas detector (10) is located inside the electrostatic buffer (3) and is used to detect whether oil and gas are present in the electrostatic buffer; the impurity collector (7) is used to collect the impurities captured by the electrode plate (6); The high-voltage power supply (5) and the oil and gas detector (10) are both connected to the controller (11).

2. The impurity removal device for oil transportation process according to claim 1, characterized in that, The impurity collector (7) is installed at the lower part of the static easing device (3) and is located below the electrode plate (6); the top of the impurity collector (7) is connected to the interior of the static easing device (3).

3. The impurity removal device for oil transportation process according to claim 2, characterized in that, An impurity detector (8) is provided in the impurity collector (7), and a valve (9) is provided at the bottom of the impurity collector (7); the impurity detector is used to detect whether impurities have appeared in the impurity collector (7); the impurity detector (8) is connected to the controller (11).

4. The impurity removal device for oil transportation process according to claim 1, characterized in that, The filter charges impurities flowing through it through a small pore size, which does not exceed 2000 μm.

5. The impurity removal device for oil transportation process according to claim 1, characterized in that, The static evaporator (3) is a cylindrical pipe, and the diameter of the static evaporator (3) is 1.2-10 times the diameter of the oil conveying pipe.

6. The impurity removal device for oil transportation process according to claim 1, characterized in that, The electrode plate is made of polished metal; The electrode plate is rectangular or square; all four corners of the electrode plate are rounded to prevent corona discharge during high voltage application. The electrode plate is installed inside the electrostatic buffer near one end of the filter.

7. The impurity removal device for oil transportation process according to claim 1, characterized in that, The high-voltage power supply (5) is controlled by the controller (11). The high-voltage power supply (5) is used to output a high voltage on the electrode plate (6). The range of the high voltage is 5kV-100kV.

8. The impurity removal device for oil transportation process according to claim 1, characterized in that, The controller (11) receives the oil delivery signal from the pipeline and the alarm signal from the oil and gas detector; the oil delivery signal includes the start signal and the stop signal of the pipeline oil delivery. When the controller (11) receives the signal to start pipeline oil transportation and does not receive the alarm signal from the oil and gas detector, it controls the high-voltage power supply to output high voltage and apply the voltage to the electrode plate to start removing impurities; When the controller (11) receives a signal that the pipeline is stopping the delivery of oil or receives an alarm signal from the oil and gas detector, it controls the high-voltage power supply to stop outputting high voltage.

9. The impurity removal device for oil transportation process according to claim 1, characterized in that, The controller (11) is connected to the impurity detector. When impurities are detected, it outputs an alarm signal to remind the operator to clean the impurities.

10. A method for removing impurities during oil transportation, characterized in that, The impurity removal device according to any one of claims 1-9 is used to electrostatically charge impurities and capture the charged impurities using an electric field, thereby achieving the removal of impurities from oil products.

Images