Self-cleaning crude oil wax removal filtration system

Abstract

The application discloses a self-cleaning crude oil wax removal filter system and belongs to the technical field of crude oil conveying and filtering. The system comprises a filter structure installed on a crude oil conveying pipeline. The filter structure comprises a plurality of groups of parallel filter pipe groups. Each group of filter pipe groups is composed of a communication pipe, a filter with an embedded filter screen, a pressure transmitter, a control valve group, a backwashing unit and / or a heating unit, and a control unit. The control unit determines the working condition based on the pressure conveying standard. If the pressure is qualified, the operation is maintained. If the pressure is unqualified, the control valve group is closed, the blowdown valve is opened, and the backwashing unit and the heating unit are started, so that the self-cleaning operation of the inside of the filter pipe group is realized. The application realizes intelligent self-cleaning, guarantees the continuity of crude oil conveying, improves the wax removal filtering efficiency, is suitable for various conveying scenes of waxy crude oil, and can solve the problems of manual cleaning, discontinuous conveying and poor wax removal effect of the traditional filter system.

Description

Technical Field

[0001] This invention relates to the field of crude oil transportation and filtration technology, specifically a self-cleaning crude oil dewaxing and filtration system. Background Technology

[0002] During crude oil extraction and transportation, the waxy components contained in crude oil will gradually precipitate and adhere to the inner walls of transportation pipelines and filtration equipment as the temperature decreases and the pressure changes. They are particularly prone to clogging filter screens, leading to increased crude oil transportation resistance and decreased transportation efficiency. In severe cases, it can cause pipeline pressure buildup and equipment failure, affecting the continuous and stable operation of the crude oil transportation system.

[0003] Most existing crude oil dewaxing and filtration equipment relies on manual periodic cleaning or a single cleaning mode. Manual cleaning requires machine shutdown, interrupting the continuous crude oil transport process and incurring significant labor costs, resulting in low cleaning efficiency. Furthermore, the timing of cleaning depends on manual experience, easily leading to either delayed cleaning causing excessive filter clogging or over-cleaning resulting in energy and resource waste. Meanwhile, a single backwashing mode can only remove loose wax from the filter surface, proving ineffective at removing firmly attached, stubborn wax. A single heating mode can only melt the wax, failing to quickly remove it from the equipment, leading to incomplete dewaxing and easy re-clogging of the filter. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a self-cleaning crude oil dewaxing filtration system to solve the technical problems mentioned in the prior art.

[0005] A self-cleaning crude oil dewaxing filtration system includes a filtration structure installed on a crude oil delivery pipeline. The filtration structure comprises several sets of filter tubes arranged side-by-side along the delivery direction of the crude oil delivery pipeline. Each filter tube set includes: A connecting pipe, the two ends of which are respectively connected to the inlet and outlet of the crude oil delivery pipeline; The filter has a hollow internal structure and a filter screen is installed inside. The open side of the filter screen is connected to the liquid inlet end of the connecting pipe, and the outer peripheral side of the filter screen is connected to the liquid outlet end of the connecting pipe. A drain port is provided at the bottom of the filter, and a drain valve is installed in the drain port. A pressure transmitter is installed at the inlet and / or outlet of the connecting pipe to detect the delivery pressure in the connecting pipe in real time. A control valve assembly is installed at the inlet and outlet ends of the connecting pipe and is used to control the connection / disconnection between the connecting pipe and the crude oil delivery pipeline. A backwashing unit and / or a heating unit are mounted on the filter, wherein the backwashing unit is used to inject cleaning fluid into the connecting pipe in reverse; and the heating unit is used to heat the interior of the filter. The control unit is connected to the pressure transmitter, drain valve, control valve group, backwash unit, and / or heating unit. The control logic of the control unit is configured to: determine whether the pressure received in the connecting pipe under the current operating condition is qualified based on the built-in pressure transmission standard; if qualified, maintain the current operating state of the control valve group; if unqualified, close the control valve group, open the drain valve, and start the backwash unit and / or the heating unit to realize the self-cleaning operation in the filter tube group; after a preset cleaning time, control the filter tube group to resume the operating condition or enter the standby mode.

[0006] Optionally, at least two sets of filter pipe assemblies are provided, and the two sets of filter pipe assemblies are connected in parallel to the crude oil delivery pipeline.

[0007] Optionally, the control logic for the filter tube group to resume operation or enter standby mode is configured as follows: When the number of filter tubes that meet the operating conditions is greater than or equal to 1, the filter tubes are controlled to enter standby mode. When the number of filter tubes that meet the operating conditions is less than 1, the filter tubes are controlled to resume operation.

[0008] Optionally, the axis of the filter screen is perpendicular to the axis of the connecting pipe, and the top opening of the filter screen is inclined to the liquid inlet end of the connecting pipe.

[0009] Optionally, the top of the filter screen is provided with a guide portion extending outwards along its circumference; A boss is provided on the inner wall of the filter, and the guide is installed on the boss, thereby forming an annular cavity between the inner wall of the filter and the outer periphery of the filter screen; the liquid outlet end of the connecting pipe is connected to the annular cavity.

[0010] Optionally, the backwashing unit includes: The flushing pipe is connected at one end to the liquid outlet of the connecting pipe and near the filter, and at the other end to a cleaning fluid supply device. A cleaning valve is installed at the liquid outlet end of the flushing pipe; Both the cleaning valve and the cleaning fluid supply device are connected to the control unit.

[0011] Optionally, the heating unit is installed at the bottom outer periphery of the filter, and the heating unit is configured as an electric heating assembly and / or a heat exchange tube assembly; The electric heating component is connected to the control unit and an external power source; The inlet end of the heat exchange tube assembly is connected to the heat source input end, and the outlet end of the heat exchange tube assembly is connected to the cold source return end. The heat source input end pumps the heat source into the heat exchange tube assembly through a heat source delivery pump to exchange heat with the heat exchanger. The heat source delivery pump is connected to the control unit.

[0012] Optionally, the filter screen is configured as a stainless steel filter cartridge structure, and the pore size on the surface of the filter screen is 1-3 cm.

[0013] Optionally, the control unit includes: The parameter configuration module is used to input the detection range of the pressure transmission standard; A differential pressure curve plotting module is used to receive the real-time delivery pressure detected by the pressure transmitter in the connecting pipe, and plot the flow pressure curve and / or pressure drop curve using the detection range of the pressure delivery standard input by the parameter configuration module as a reference axis. The method for plotting the flow pressure curve is set as follows: based on the detection results of the pressure P1 at the front end of the filter and the pressure P2 at the rear end of the filter at the same moment, a double-line graph of pressure changing with time is generated within a set detection period. The method for plotting the pressure drop curve is set as follows: based on the single delivery pressure at the front end or rear end of the filter, or the difference between the delivery pressures at the front end and rear end of the filter, a single-line graph of pressure changing with time is generated within a set detection period. The determination module is used to detect whether the trend of the flow-pressure curve and / or pressure drop curve exceeds the limit range of the reference axis; when the trend of the flow-pressure curve or pressure drop curve exceeds the limit range of the reference axis, the pressure received in the connecting pipe under the current operating condition is determined to be unqualified; when all trends in the flow-pressure curve and / or pressure drop curve do not exceed the limit range of the reference axis, the pressure received in the connecting pipe under the current operating condition is determined to be qualified. The instruction generation module generates control instructions based on the judgment result of the judgment module. If the pressure received in the connecting pipe under the current operating condition is unqualified, a first control instruction is generated to trigger the filter pipe group to enter the self-cleaning operation. If the pressure received in the connecting pipe under the current operating condition is qualified, a second control instruction is generated to trigger the control valve group to maintain the current operating condition.

[0014] Optionally, the instruction generation module has a built-in logic self-test program. When the instruction generation module generates the first control instruction, it triggers the logic self-test program to automatically detect the number of all currently controlled filter tube groups that meet the operating conditions, and dynamically adjusts the control parameters of the first control instruction accordingly. The judgment logic for whether a filter tube group meets the operating conditions is configured as follows: the filter tube group is not in a self-cleaning operation state. The method for dynamically adjusting the control parameters of the first control instruction is as follows: When the number of filter tubes that meet the operating conditions is greater than or equal to 1, the filter tubes are controlled to enter standby mode after the self-cleaning operation is completed. When the number of filter tubes that meet the current operating conditions is less than 1, the filter tubes will be controlled to resume operation after the self-cleaning operation is completed.

[0015] The beneficial effects that this invention can produce include: 1. The self-cleaning crude oil dewaxing filtration system provided by this invention, by setting pressure transmitters at the inlet and / or outlet of the connecting pipe, can collect delivery pressure data in real time. This allows the control unit to automatically determine the filter screen blockage status based on the built-in pressure standard, thus triggering the cleaning process without manual intervention. This completely solves the problems of traditional manual cleaning relying on experience, low efficiency, and requiring downtime, significantly reducing labor costs. At the same time, the system is equipped with a corresponding intelligent management strategy for the filter tube group, which can meet the requirements of automatic cleaning, switching, and restart in case of failure, ensuring continuous and stable operation of the system when unattended, and reducing maintenance costs.

[0016] 2. This invention integrates a backwashing unit and a heating unit into a dual cleaning mode, enabling synergistic wax removal through heating and melting, and backwashing. The heating unit quickly melts stubborn wax adhering to the filter screen and the inner wall of the filter, while the backwashing unit injects cleaning fluid in the reverse direction to thoroughly flush the melted wax and impurities to the drain outlet. Compared to a single cleaning mode, the wax removal effect is more thorough, effectively preventing secondary clogging of the filter screen and extending the service life of the filtration equipment.

[0017] 3. By constructing a complete closed-loop control logic for pressure monitoring, status judgment, automatic cleaning, and resumption of operation, this invention can ensure that the control unit coordinates the operation of the pressure transmitter, drain valve, control valve group, and backwash / heating unit, thereby reducing human error, ensuring precise linkage of the actions of each component, further improving the reliability and safety of system operation, and adapting to the working conditions of various waxy crude oil transportation scenarios. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the dual-pipe group operation mode of the self-cleaning crude oil dewaxing filtration system of the present invention. Figure 2This is a schematic diagram of the single-pipe group operation mode of the self-cleaning crude oil dewaxing filtration system of the present invention. Figure 3 This is a schematic diagram of the filter tube assembly of the present invention; Figure 4 This is a block diagram of the control unit architecture of the present invention; In the diagram: 1. Crude oil transmission pipeline, 2. Connecting pipe, 3. Filter, 4. Filter screen, 5. Drain outlet, 6. Drain valve, 7. Pressure transmitter, 8. Control valve assembly, 9. Guide section, 10. Boss, 11. Annular cavity, 12. Flushing pipeline, 13. Cleaning valve, 14. Heating unit, 15. Parameter configuration module, 16. Differential pressure curve plotting module, 17. Judgment module, 18. Instruction generation module. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figure 1 , Figure 2 and Figure 3As shown, the present invention provides a self-cleaning crude oil dewaxing filtration system. The filtration system includes a filtration structure installed on a crude oil delivery pipeline 1. The filtration structure includes several sets of filter tubes arranged side by side along the delivery direction of the crude oil delivery pipeline 1. Each filter tube set includes a connecting pipe 2, a filter 3, a pressure transmitter 7, a control valve group 8, a backwashing unit and / or a heating unit 14, and a control unit. The connecting pipe 2 is connected to the inlet and outlet of the crude oil delivery pipeline 1, respectively. The filter 3 has a hollow internal structure and a filter screen 4 is installed inside. The open side of the filter screen 4 is connected to the inlet of the connecting pipe 2, and the outer periphery of the filter screen 4 is connected to the outlet of the connecting pipe 2. A drain port 5 is provided at the bottom of the filter 3, and a drain valve 6 is installed inside the drain port 5. A pressure transmitter 7 is installed at the inlet and / or outlet of the connecting pipe 2 to detect the delivery pressure in the connecting pipe 2 in real time. A control valve group 8 is installed at the inlet and outlet of the connecting pipe 2 to control the connection / disconnection between the connecting pipe 2 and the crude oil delivery pipeline 1. A backflushing unit and / or heating unit 14 are installed on the filter 3, wherein the backflushing unit is used to inject cleaning solution into the connecting pipe 2 in the reverse direction. The cleaning solution; heating unit 14 is used to heat the interior of filter 3; the control unit is connected to pressure transmitter 7, drain valve 6, control valve group 8, and backwash unit and / or heating unit 14 respectively. The control logic of the control unit is configured to: determine whether the pressure received in the connecting pipe 2 under the current operating condition is qualified based on the built-in pressure transmission standard. If qualified, the current operating state of control valve group 8 is maintained; if not qualified, control valve group 8 is closed, drain valve 6 is opened at the same time, and backwash unit and / or heating unit 14 are started to realize the self-cleaning operation inside the filter tube group; the cleaning time is set according to previous cleaning experience or cleaning test data. After the preset cleaning time, the filter tube group is controlled to resume the operating condition or enter standby mode. Thus, the cleaning process can be triggered without manual intervention, completely solving the problems of traditional manual cleaning relying on experience, low efficiency, and needing to stop operation, greatly reducing labor input costs; and compared with a single cleaning mode, the dewaxing effect is more thorough, effectively avoiding secondary clogging of filter screen 4 and extending the service life of the filtration equipment.

[0021] Furthermore, such as Figure 1 As shown, at least two sets of filter pipe assemblies are provided, and the two sets of filter pipe assemblies are connected in parallel to the crude oil delivery pipeline 1. In actual use, when a single set of filter pipe assemblies triggers the cleaning process, the control unit can close the control valve group 8 of that set, while the remaining filter pipe assemblies maintain normal operation, ensuring uninterrupted crude oil delivery. This solves the defect that traditional single-set filter equipment requires a complete shutdown during cleaning, and significantly improves the continuous operation stability of the crude oil delivery system.

[0022] Furthermore, the control logic for resuming operation or entering standby mode of the filter tube group is configured as follows: when the number of filter tube groups that currently meet the operating conditions is greater than or equal to 1, the filter tube group is controlled to enter standby mode; when the number of filter tube groups that currently meet the operating conditions is less than 1, the filter tube group is controlled to resume operation. This ensures that only one set of filter tube groups is in operation, thereby ensuring stable crude oil delivery pressure and preventing increased wax deposition in the tubes due to pressure reduction during crude oil delivery.

[0023] Furthermore, such as Figure 3 As shown, the axis of filter screen 4 is perpendicular to the axis of connecting pipe 2, and the top opening of filter screen 4 is inclined towards the liquid inlet of connecting pipe 2. A guide portion 9 extends outwards from the top of filter screen 4; a boss 10 is provided on the inner wall of filter 3, and the guide portion 9 is mounted on the boss 10, thus forming an annular cavity 11 between the inner wall of filter 3 and the outer periphery of filter screen 4; the liquid outlet of connecting pipe 2 is connected to the annular cavity 11. Compared with the previous design where the liquid outlet of connecting pipe 2 is directly attached to filter screen 4, this structure increases the flow area of ​​the liquid outlet of connecting pipe 2, thereby avoiding the impact of partial blockage of filter screen 4 on the crude oil transportation efficiency of connecting pipe 2, while reducing the frequency of cleaning and maintenance, and ensuring continuous and stable crude oil transportation.

[0024] Furthermore, such as Figure 3 As shown, the backwashing unit includes a flushing pipe 12, a cleaning valve 13, and a cleaning fluid supply device. One end of the flushing pipe 12 is connected to the outlet end of the connecting pipe 2, near the filter 3, and the other end is connected to the cleaning fluid supply device. The cleaning valve 13 is installed at the outlet end of the flushing pipe 12. Both the cleaning valve 13 and the cleaning fluid supply device are connected to the control unit. Specifically, the cleaning fluid supply device has a tank for storing the cleaning fluid and a pump for delivering the cleaning fluid. When backwashing is required, the control pump and the cleaning valve are opened synchronously, thereby pumping the cleaning fluid into the flushing pipe 12 through the pump, and then flushing the impurities and wax deposits adhering to the inner wall of the filter tube assembly. At the same time, in order to prevent crude oil from flowing into the tank, a set of one-way valves is installed on the flushing pipe 12 to ensure that only the cleaning fluid is allowed to pass through the flushing pipe 12.

[0025] Furthermore, such as Figure 3As shown, the heating unit 14 is installed on the outer bottom of the filter 3. The heating unit 14 is configured as an electric heating assembly and / or a heat exchange tube assembly. The electric heating assembly is connected to the control unit and an external power supply, and the electric heating assembly uses an electric heating tube or an electric heating wire. The inlet end of the heat exchange tube assembly is connected to the heat source input end, and the outlet end of the heat exchange tube assembly is connected to the cold source return end. The heat source input end pumps the heat source into the heat exchange tube assembly through a heat source delivery pump to exchange heat with the heat exchanger. The heat source delivery pump is connected to the control unit. To prevent the heating unit 14 from being exposed to the outside of the filter 3, causing heat loss or burns to operators, a removable protective cover is provided on its outside for easy inspection and maintenance of the heating unit 14.

[0026] Furthermore, the filter screen 4 is designed with a stainless steel filter cartridge structure, which can be adapted to the high-temperature operating conditions of the heating unit 14. It is not easily deformed or damaged due to wax adhesion or cleaning and rinsing, thus extending the service life of the filter screen. The filter pores on the surface of the filter screen 4 have a diameter of 1-3cm, which can balance filtration accuracy and delivery efficiency. It can effectively intercept large pieces of wax and impurities in crude oil, preventing them from entering subsequent pipelines, while avoiding rapid clogging due to excessively small pores, reducing cleaning frequency and energy consumption, and adapting to the crude oil delivery flow requirements.

[0027] Furthermore, such as Figure 4As shown, the control unit includes a parameter configuration module 15, a differential pressure curve plotting module 16, a judgment module 17, and an instruction generation module 18. The parameter configuration module 15 is used to input the detection range of the pressure transmission standard. The differential pressure curve plotting module 16 is used to receive the transmission pressure detected in the connecting pipe 2 in real time by the pressure transmitter 7, and to plot the flow pressure curve and / or pressure drop curve using the detection range of the pressure transmission standard input by the parameter configuration module 15 as a reference axis. The method for plotting the flow pressure curve is set as follows: based on the detection results of the pressure P1 at the front end of the filter 3 and the pressure P2 at the rear end of the filter 3 at the same time, a double-line graph of pressure changing with time is generated within a set detection period. The method for plotting the pressure drop curve is set as follows: based on the single transmission pressure at the front end or rear end of the filter 3, or the difference between the transmission pressures at the front end and rear end of the filter 3, a single line graph of pressure changing with time is generated within a set detection period. Sample diagram; the judgment module 17 is used to detect whether the trend of the flow pressure curve and / or pressure drop curve exceeds the limit range of the reference axis; when the trend of the flow pressure curve or pressure drop curve exceeds the limit range of the reference axis, it is determined that the conveying pressure received in the connecting pipe 2 under the current operating condition is unqualified; when all trends in the flow pressure curve and / or pressure drop curve do not exceed the limit range of the reference axis, it is determined that the conveying pressure received in the connecting pipe 2 under the current operating condition is qualified; the instruction generation module 18 generates control instructions according to the judgment result of the judgment module 17, wherein if the conveying pressure received in the connecting pipe 2 under the current operating condition is unqualified, a first control instruction is generated to trigger the filter pipe group to enter the self-cleaning operation; if the conveying pressure received in the connecting pipe 2 under the current operating condition is qualified, a second control instruction is generated to trigger the control valve group 8 to maintain the current operating condition.

[0028] Furthermore, the instruction generation module 18 has a built-in logic self-test program. When the instruction generation module 18 generates the first control instruction, it triggers the logic self-test program to automatically detect the number of all currently controlled filter tube groups that meet the operating conditions and dynamically adjust the control parameters of the first control instruction. The judgment logic for whether a filter tube group meets the operating conditions is configured as follows: the filter tube group is not in the self-cleaning operation state. The method for dynamically adjusting the control parameters of the first control instruction is as follows: when it is detected that the number of filter tube groups that currently meet the operating conditions is greater than or equal to 1, the filter tube group is controlled to enter the standby mode after the self-cleaning operation is completed; when it is detected that the number of filter tube groups that currently meet the operating conditions is less than 1, the filter tube group is controlled to resume the operating condition after the self-cleaning operation is completed.

[0029] In the above, the filtration system, by constructing a complete closed-loop control logic of pressure monitoring, status judgment, automatic cleaning and recovery operation, can ensure that the control unit coordinates the operation of pressure transmitter 7, drain valve 6, control valve group 8 and backwash / heating unit 14, thereby reducing human error, ensuring precise linkage of the actions of each component, further improving the reliability and safety of system operation, and adapting to the working conditions of various waxy crude oil transportation scenarios.

Claims

1. A self-cleaning crude oil dewaxing filtration system, comprising a filtration structure installed on a crude oil delivery pipeline (1), characterized in that, The filtration structure includes several sets of filter tubes arranged side by side along the conveying direction of the crude oil pipeline (1), and the filter tube sets include: A connecting pipe (2) is connected at both ends to the inlet and outlet ends of the crude oil transport pipeline (1), respectively. The filter (3) has a hollow internal structure. A filter screen (4) is installed inside the filter (3). The opening side of the filter screen (4) is connected to the liquid inlet end of the connecting pipe (2). The outer periphery of the filter screen (4) is connected to the liquid outlet end of the connecting pipe (2). A drain port (5) is provided at the bottom of the filter (3). A drain valve (6) is installed inside the drain port (5). Pressure transmitter (7), the pressure transmitter (7) is installed at the inlet end and / or outlet end of the connecting pipe (2) for real-time detection of the delivery pressure in the connecting pipe (2); Control valve assembly (8), which is installed at the inlet and outlet of the connecting pipe (2), is used to control the connection / disconnection between the connecting pipe (2) and the crude oil delivery pipeline (1); A backwashing unit and / or a heating unit (14) are installed on the filter (3), wherein the backwashing unit is used to inject cleaning fluid into the connecting pipe (2) in reverse; and the heating unit (14) is used to heat the interior of the filter (3). The control unit is connected to the pressure transmitter (7), the drain valve (6), the control valve group (8), and the backwashing unit and / or the heating unit (14). The control logic of the control unit is configured to: determine whether the pressure received in the connecting pipe (2) under the current operating condition is qualified based on the built-in pressure transmission standard; if qualified, maintain the current operating state of the control valve group (8); if unqualified, close the control valve group (8), open the drain valve (6), and start the backwashing unit and / or the heating unit (14) to realize the self-cleaning operation in the filter tube group; after the preset cleaning time, control the filter tube group to resume the operating condition or enter the standby mode.

2. The self-cleaning crude oil dewaxing filtration system according to claim 1, characterized in that, The filter pipe assembly is provided in at least two sets, and the two sets of filter pipe assemblies are connected in parallel to the crude oil delivery pipeline (1).

3. The self-cleaning crude oil dewaxing filtration system according to claim 1, characterized in that, The control logic for the filter tube group to resume operation or enter standby mode is configured as follows: When the number of filter tubes that meet the operating conditions is greater than or equal to 1, the filter tubes are controlled to enter standby mode. When the number of filter tubes that meet the operating conditions is less than 1, the filter tubes are controlled to resume operation.

4. The self-cleaning crude oil dewaxing filtration system according to claim 1, characterized in that, The axis of the filter screen (4) is perpendicular to the axis of the connecting pipe (2), and the top opening side of the filter screen (4) is inclined towards the liquid inlet end of the connecting pipe (2) and has a liquid inlet.

5. The self-cleaning crude oil dewaxing filtration system according to claim 4, characterized in that, The top of the filter screen (4) is provided with a guide part (9) extending outward from all sides. A boss (10) is provided on the inner wall of the filter (3), and the guide (9) is installed on the boss (10), thereby forming an annular cavity (11) between the inner wall of the filter (3) and the outer periphery of the filter screen (4); the liquid outlet end of the connecting pipe (2) is connected to the annular cavity (11).

6. The self-cleaning crude oil dewaxing filtration system according to claim 1, characterized in that, The backwashing unit includes: The flushing pipe (12) is connected at one end to the liquid outlet of the connecting pipe (2) and near the side of the filter (3), and at the other end to a cleaning liquid supply device. A cleaning valve (13) is installed at the liquid outlet end of the flushing pipe (12); The cleaning valve (13) and the cleaning fluid supply device are both connected to the control unit.

7. The self-cleaning crude oil dewaxing filtration system according to claim 1, characterized in that, The heating unit (14) is installed on the outer periphery of the filter (3), and the heating unit (14) is configured as an electric heating assembly and / or a heat exchange tube assembly; The electric heating component is connected to the control unit and an external power source; The inlet end of the heat exchange tube assembly is connected to the heat source input end, and the outlet end of the heat exchange tube assembly is connected to the cold source return end. The heat source input end pumps the heat source into the heat exchange tube assembly through a heat source delivery pump to exchange heat with the heat exchanger. The heat source delivery pump is connected to the control unit.

8. The self-cleaning crude oil dewaxing filtration system according to claim 1, characterized in that, The filter screen (4) is configured as a stainless steel filter cylinder structure, and the filter hole diameter on the surface of the filter screen (4) is 1-3cm.

9. The self-cleaning crude oil dewaxing filtration system according to claim 1, characterized in that, The control unit includes: Parameter configuration module (15), the parameter configuration module (15) is used to input the detection range of the pressure transmission standard; The differential pressure curve plotting module (16) is used to receive the real-time transmission pressure detected by the pressure transmitter (7) in the connecting pipe (2), and to plot the flow pressure curve and / or pressure drop curve with the detection range of the pressure transmission standard input by the parameter configuration module (15) as the reference axis. The method for plotting the flow pressure curve is set as follows: a double-line pattern of pressure changing with time is generated within a set detection period based on the detection results of the front pressure P1 of the filter (3) and the rear pressure P2 of the filter (3) at the same time. The method for plotting the pressure drop curve is set as follows: a single-line pattern of pressure changing with time is generated within a set detection period based on the single transmission pressure of the front or rear of the filter (3) or the difference between the transmission pressures of the front and rear of the filter (3). The determination module (17) is used to detect whether the trend of the flow pressure curve and / or pressure drop curve exceeds the limit range of the reference axis; when the trend of the flow pressure curve or pressure drop curve exceeds the limit range of the reference axis, it is determined that the conveying pressure received in the connecting pipe (2) under the current operating condition is unqualified; when all the trends of the flow pressure curve and / or pressure drop curve do not exceed the limit range of the reference axis, it is determined that the conveying pressure received in the connecting pipe (2) under the current operating condition is qualified. The instruction generation module (18) generates control instructions based on the judgment result of the judgment module (17). If the pressure received in the connecting pipe (2) under the current operating condition is not qualified, a first control instruction is generated to trigger the filter pipe group to enter the self-cleaning operation. If the pressure received in the connecting pipe (2) under the current operating condition is qualified, a second control instruction is generated to trigger the control valve group (8) to maintain the current operating condition.

10. The self-cleaning crude oil dewaxing filtration system according to claim 9, characterized in that, The instruction generation module (18) has a built-in logic self-test program. When the instruction generation module (18) generates the first control instruction, it triggers the logic self-test program to automatically detect the number of all currently controlled filter tube groups that meet the operating conditions and dynamically adjust the control parameters of the first control instruction. The judgment logic for the filter tube group meeting the operating conditions is configured as follows: the filter tube group is not in the self-cleaning operation state; wherein the method for dynamically adjusting the control parameters of the first control instruction is: When the number of filter tubes that meet the operating conditions is greater than or equal to 1, the filter tubes are controlled to enter standby mode after the self-cleaning operation is completed. When the number of filter tubes that meet the current operating conditions is less than 1, the filter tubes will be controlled to resume operation after the self-cleaning operation is completed.

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