A high temperature and high pressure thickening instrument heat conducting oil circulation filtering system device

Abstract

The application relates to a high-temperature and high-pressure thickening instrument heat-conducting oil circulating filtration system device, which comprises a high-temperature and high-pressure thickening instrument heat-conducting oil circulating filtration system device, including a centrifugal filtering mechanism and a pressurized filtering mechanism; the centrifugal filtering machine is fixedly installed through a rack, the top of the centrifugal filtering machine is provided with an oil inlet pipe, and a centrifugal filtering mechanism capable of moving up and down is arranged below the centrifugal filtering machine; a rotatable centrifugal barrel is arranged in the centrifugal filtering mechanism, the centrifugal barrel is composed of multiple barrel petals which can be combined to open and close, small holes A are formed in the barrel petals, and a cotton filter cloth layer A is arranged on the inner wall of the barrel petals; the middle part of the pressurized filtering mechanism is divided into an upper cavity and a lower cavity through a filter layer structure. The application has the advantages of simple structure, low cost, fast filtration, good cleaning of adherent sundries, fast oil-water separation and treatment of adherent cement particles and other solid-phase impurities in the heat-conducting oil.

Description

Technical Field

[0001] This invention relates to the field of heat transfer oil recovery and filtration technology, and in particular to a heat transfer oil circulation and filtration system for a high-temperature and high-pressure thickener. Background Technology

[0002] The cement slurry thickening test is a test of the pumpability time of cement slurry under simulated high temperature and high pressure conditions in wells. It is one of the main methods for testing the performance of cement slurry and is achieved through a high temperature and high pressure thickening instrument. The principle is to heat the heat transfer oil in a closed vessel and then transfer the heat to the rotating cement slurry cup in the vessel by heat convection. At the same time, the pressure generated by the heat transfer oil after heating is applied to the cement slurry in the cup through the pressure transmission rubber.

[0003] Cement slurry thickeners are precision instruments and expensive, requiring careful maintenance and upkeep in daily operations. Currently, oil well cement slurry experiments generate a large amount of waste heat transfer oil, resulting in waste and environmental damage during disposal. This is because the waste oil contains a large amount of water, cement particles, and other solid particles; reusing it would cause significant damage to the experimental equipment.

[0004] However, during prolonged operation, the heat transfer oil will come into contact with cement slurry. Some water, impurities (cement particles and other solid particles), and other contaminants from the cement slurry in the slurry cup will enter the heat transfer oil. The problems are as follows: First, during subsequent tests, the water in the heat transfer oil will form high-temperature steam, which not only corrodes the equipment structure but also carries chemicals that pose a chemical hazard to human health. Second, the cement particles and other solid particles can puncture and leak from precision high-pressure valves, and the accumulation of large amounts of particles can clog the inlet and outlet oil lines, causing experimental failure. Third, the cement slurry thickener is a precision instrument and is expensive, requiring careful maintenance and upkeep during daily operation.

[0005] Therefore, this solution filters the heat transfer oil used in the experiment, so that the heat transfer oil can pass through the filter and its various performance indicators can meet the standards for reuse. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a high-temperature and high-pressure thickener heat transfer oil circulation filtration system that can achieve rapid filtration, effectively clean adhesive impurities, has a simple structure, and low cost; and can achieve rapid oil-water separation and treat solid impurities such as adhesive cement particles in heat transfer oil.

[0007] The objective of this invention is achieved through the following technical solution: a high-temperature and high-pressure thickener heat transfer oil circulation filtration system device, comprising a centrifugal filtration mechanism and a pressurized filtration mechanism;

[0008] The centrifugal filter is fixedly installed on a frame, with an oil inlet pipe at the top and a centrifugal filtration mechanism that can move up and down below it.

[0009] The centrifugal filtration mechanism is equipped with a rotatable centrifugal bucket, which is formed by multiple bucket segments that can be opened and closed. The bucket segments have small holes A and cotton filter cloth layers A on their inner walls. The pressure filtration mechanism is divided into an upper chamber and a lower chamber in the middle by a filter layer structure.

[0010] When filtration is required: First, centrifugal filtration is performed, which involves closing multiple valves to close the lower part of the centrifuge barrel, allowing the pressure filtration mechanism to extend into the centrifugal filtration mechanism and form a closed inner cavity. The pressure filtration mechanism is non-contactly fitted onto the outside of the centrifuge barrel. Waste heat transfer oil is introduced through the oil inlet pipe, and the heat transfer oil falls into the closed centrifuge barrel. Then, the centrifuge barrel rotates to achieve centrifugal separation. The separated oil is thrown onto the inner wall of the upper cavity, and the oil eventually collects on the upper surface of the filter layer. Then, pressure filtration is performed, which involves adding high-pressure, high-temperature gas into the closed cavity formed by the pressure filtration mechanism extending into the centrifugal filtration mechanism, allowing the oil to be filtered through the filter layer and finally collect in the lower cavity.

[0011] When it is necessary to clean the impurities on the centrifugal filter mechanism: lower the pressure filter mechanism to a certain position without detaching it from the centrifugal filter mechanism, allow the barrel flaps to unfold, and then rotate the centrifugal barrel. Under the action of centrifugal force, the impurities on the cotton filter cloth layer A on the inner wall of the barrel flaps are thrown onto the inner wall of the centrifugal filter mechanism.

[0012] As a preferred technical solution of this application, the centrifugal filtration mechanism includes an outer cylinder and a centrifugal barrel. The centrifugal barrel is rotatably disposed inside the outer cylinder and includes an annular component and multiple barrel segments. The lower end of the annular component is hinged to the upper end of the corresponding multiple axially arranged barrel segments via multiple lugs. The outer wall of each barrel segment is hinged to the outer wall of the annular component via a battery-powered push rod motor. When the multiple battery-powered push rod motors extend, they cause the multiple barrel segments to rotate and close the bottom of the centrifugal barrel, forming a structure that facilitates centrifugal filtration. When the multiple battery-powered push rod motors retract, they cause the multiple barrel segments to rotate and open the bottom of the centrifugal barrel, forming a structure that facilitates the removal of debris from the inner wall of the barrel segments by centrifugation.

[0013] As a preferred technical solution of this application, in the centrifuge tank, a driven toothed groove member is fixedly sleeved on the outer cylindrical surface of the annular member. The outer cylinder has an outwardly protruding cylindrical portion in the middle, where a driving gear is installed. The driving gear meshes with the driven toothed groove member. The shaft of the driving gear extends out of the protruding cylindrical portion, and a pulley is sleeved on the end of the extended shaft. The pulley is connected to the centrifuge motor for driving.

[0014] As a preferred technical solution of this application, the upper end of the pressurized filtration mechanism is fitted with a flexible sealing ring. When it extends into the outer cylinder, the flexible sealing ring contacts the inner wall of the outer cylinder, forming a sealing structure. The outer cylinder is equipped with an inlet valve and an exhaust valve. The inlet valve is connected to a pressurized air source, and the exhaust valve is connected to the atmosphere. When the inlet valve is closed and the exhaust valve is open, the centrifugal filtration mechanism performs filtration; when the inlet valve is open and the exhaust valve is closed, the pressurized filtration mechanism performs filtration.

[0015] As a preferred technical solution of this application, the pressurized filtration mechanism includes an upper barrel and a lower barrel; the lower barrel has an annular step in the middle of its inner wall, and the upper barrel is placed on the annular step; the bottom of the upper barrel has multiple through holes B, and a cotton filter cloth layer B is placed inside the bottom of the upper barrel, with silica gel sand laid on the upper surface of the cotton filter cloth layer B; a flexible sealing ring is provided at the upper edge of the upper barrel, and when the upper barrel is inserted into the centrifugal filtration mechanism, the flexible sealing ring fits against the inner wall of the centrifugal filtration mechanism.

[0016] As a preferred technical solution of this application, the upper edge of the lower tank is a flange and the flange has a sealing layer. When the pressure filtration mechanism extends into the centrifugal filtration mechanism, the lower end of the centrifugal filtration mechanism abuts against the sealing layer of the flange. A level gauge is provided on the lower outer side of the lower tank.

[0017] As a preferred technical solution of this application, an annular barrel is placed close to the inner wall of the upper barrel. The inner wall of the annular barrel has multiple through holes C, forming a filter screen-like wall. When the multiple barrel segments unfold and centrifuge to remove debris from the inner wall of the centrifuge barrel, the debris eventually falls into the annular barrel. A bearing component is provided at the center of the upper inner part of the annular barrel. The bearing component includes an inner ring and an outer ring adapted with thrust balls. The outer ring is fixed to the annular barrel by multiple support rods. The inner wall of the inner ring is a cone shape that is larger at the top and smaller at the bottom. When the centrifuge barrel is closed, it is a cone shape that is larger at the top and smaller at the bottom. After closing, its lower end abuts against the inner wall of the inner ring, forming a structure that supports the lower end of the centrifuge barrel.

[0018] As a preferred technical solution of this application, in the pressure filtration mechanism, the lower tank is placed on a base, and the base has rollers. The base is placed on a lifting mechanism, and the bottom of the base has a conical cavity that is smaller at the top and larger at the bottom. A retractable top column is provided on the lifting mechanism, and the upper end of the top column is also conical in shape, smaller at the top and larger at the bottom. When the pressure filtration mechanism is placed on the lifting mechanism, the top column extends upward and fits against the conical cavity, so that the pressure filtration mechanism is located at the center of the lifting mechanism, forming a position adjustment structure for the pressure filtration mechanism.

[0019] As a preferred technical solution of this application, the lifting mechanism is placed in a recessed area on the bottom surface. When the lifting mechanism retracts, the upper surface of the lifting mechanism is flush with the bottom surface, and then the top column retracts, making it easy for the pressure filtration mechanism to be moved away.

[0020] The present invention has the following advantages:

[0021] (1) It can ensure the rapid filtration of waste heat transfer oil and effectively clean the highly adhesive impurities in the entire system, preventing the impurities from clogging the entire system and causing it to fail to operate properly.

[0022] It should be noted that the waste heat transfer oil generated in cement slurry thickening tests is currently mostly discharged directly, which not only pollutes the environment but also leads to high test costs. Some factories or enterprises collect the heat transfer oil and let it stand for filtration, but this method takes too long. In the field of filtration, there are some methods that use high pressure for filtration, but this approach is not very feasible in the field of heat transfer oil. This is because the cement particles in heat transfer oil are generally around 250-500 mesh, between 0.065mm and 0.033mm. There is electrostatic discharge and various molecular adsorption between these extremely small particles, and conventional filtration cannot filter out fine particles. At the same time, fine particles can cause punctures in precision high-pressure valves, and a large number of particles can clog the oil inlet and return pipes. In addition, the impurities in heat transfer oil are highly adhesive and can easily clog the filter pores under high pressure—the high pressure forces the impurities into the filter pores. Centrifugal filtration also exists in the field of filtration, but it is not very reliable for heat transfer oil filtration, again because the impurities in heat transfer oil are highly viscous and can easily adhere to the inner wall of the centrifuge.

[0023] In this solution, centrifugal filtration is first used to allow a large amount of debris to adhere to the inner wall of a conical barrel formed by multiple barrel segments. Then, pressure filtration is applied. This results in very little debris on the silica gel sand and cotton filter cloth layers within the pressure filtration mechanism, making it less likely to clog the filter pores, reducing the need for replacement of the silica gel sand and cotton filter cloth layers, and lowering the costs associated with replacement. Furthermore, when the conical barrel formed by the multiple barrel segments unfolds, the difficult-to-clean debris adhering to the inner wall is thrown off by centrifugal force and eventually scraped off and falls into the annular barrel. Therefore, this solution ensures that difficult-to-clean adhesive debris can be properly removed while maintaining filtration effectiveness, ensuring the normal operation of the entire system.

[0024] (2) The entire system has a simple structure, low manufacturing cost, and can be automated. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the present invention;

[0026] Figure 2 This is a schematic diagram of the structure of multiple barrel segments unfolded in this invention;

[0027] Figure 3 This is a schematic diagram of the structure between the centrifugal filtration mechanism and the pressure filtration mechanism;

[0028] Figure 4 This is a schematic diagram of the centrifugal filtration mechanism;

[0029] Figure 5 A schematic diagram of a pressure filtration mechanism mounted on a lifting mechanism;

[0030] Figure 6 This is a schematic diagram of the structure between the upper tank and the annular tank in a pressure filtration mechanism.

[0031] Figure 7 This is a schematic diagram showing the structure of the lower end of the closed centrifuge drum abutting against the inner ring wall of the bearing component;

[0032] Figure 8 This refers to the heavy oil before filtration in a standard pressurization test.

[0033] Figure 9 This refers to the heavy oil after filtration in a standard pressurization test;

[0034] Figure 10 This scheme uses high-pressure but not high-temperature gas in the pressurization experiment for the heavy oil before filtration;

[0035] Figure 11 This scheme uses high-pressure but not high-temperature gas in the pressurization experiment on the filtered heavy oil;

[0036] Figure 12 The heavy oil used in this scheme for centrifugation and pressurization experiments is before filtration;

[0037] Figure 13 The centrifugation and pressurization experiments in this scheme were conducted on the filtered heavy oil.

[0038] In the diagram: 100-Centrifugal filtration mechanism, 100-1 Oil inlet pipe, 10-Centrifugal barrel, 10-1-Barrel flap, 10-2-Annular part, 10-2-1-Driven geared part, 10-3 Push rod motor, 20-Outer cylinder, 20-1-Drive gear, 20-2 Pulley, 20-3 Inlet valve, 20-4 Exhaust valve;

[0039] 200-Pressure filtration mechanism, 30-Upper tank, 30-1-Flexible sealing ring, 30-2Cotton filter cloth layer B, 30-3-Silica gel sand, 40-Lower tank, 40-1-Level gauge, 50-Annular tank, 50-1Support rod, 60-Bearing component, 60-1-Inner ring, 60-2-Outer ring, 70-Lifting mechanism, 71-Top column;

[0040] 300 - pit. Detailed Implementation

[0041] The present invention will be further described below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the following description.

[0042] It should be noted that the orientation or positional relationship indicated by terms such as "left" and "right" is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is usually placed during use, or the orientation or positional relationship in which those skilled in the art would conventionally understand it. Such terms are only for the convenience of describing the invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0043] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0044] like Figures 1-4 As shown, a high-temperature and high-pressure thickener heat transfer oil circulation filtration system device includes a centrifugal filtration mechanism 100 and a pressure filtration mechanism 200.

[0045] The centrifugal filter 1 is fixedly installed by a frame, with an oil inlet pipe 100-1 at the top and a centrifugal filtration mechanism 200 that can move up and down below it.

[0046] A rotatable centrifugal bucket 10 is provided inside the centrifugal filtration mechanism 100. The centrifugal bucket 10 is formed by multiple bucket segments 10-1 that can be opened and closed. Small holes A are opened on the bucket segments 10-1 and cotton filter cloth layer A is provided on their inner wall. The pressure filtration mechanism 200 is divided into an upper chamber and a lower chamber in the middle through the filter layer structure.

[0047] When filtration is required: First, centrifugal filtration is performed, that is, the lower part of the centrifugal barrel 10 is closed by closing multiple barrel flaps 10-1, allowing the pressure filtration mechanism 200 to extend into the centrifugal filtration mechanism 100, forming a closed inner cavity after insertion, and the pressure filtration mechanism 200 is non-contactly fitted over the centrifugal barrel 10. Waste heat transfer oil is introduced through the oil inlet pipe 100-1, and the heat transfer oil falls into the closed centrifugal barrel 10. Then, the centrifugal barrel 10 rotates to achieve centrifugal separation, and the separated oil is thrown onto the inner wall of the upper cavity. The oil eventually collects on the upper surface of the filter layer. Then, pressure filtration is performed, that is, high-pressure high-temperature gas is added into the closed cavity formed after the pressure filtration mechanism 200 extends into the centrifugal filtration mechanism 100, allowing the oil to be filtered through the filter layer and finally collected in the lower cavity.

[0048] When it is necessary to clean the impurities on the centrifugal filter mechanism 100: let the pressure filter mechanism 200 descend to a certain position without detaching from the centrifugal filter mechanism 100, let the barrel flap 10-1 unfold, and then let the centrifugal barrel 10 rotate. Under the action of centrifugal force, the impurities on the cotton filter cloth layer A on the inner wall of the barrel flap 10-1 are thrown onto the inner wall of the centrifugal filter mechanism 100.

[0049] See Figure 3 and Figure 4The centrifugal filtration mechanism 100 was designed, which includes an outer cylinder 20 and a centrifugal tank 10.

[0050] The outer cylinder 20 has a closed cover cylinder at the upper end. The cover cylinder has a through oil inlet pipe 100-1 at the center. The cover cylinder has an air inlet valve 20-3 and an air outlet valve 20-4 on its side wall. The air inlet valve 20-3 is connected to a high-pressure air source, and the air outlet valve 20-4 is connected to the outside atmosphere.

[0051] The outer cylinder 20 has an outwardly protruding cylindrical part in the middle. Multiple drive gears 20-1 are installed in the annular groove formed by the protruding cylindrical part. The shaft of the drive gear 20-1 passes through the protruding cylindrical part and the end of the shaft is fitted with a pulley 20-2. The pulley 20-2 is connected to the centrifugal motor drive.

[0052] Furthermore, the centrifuge bucket 10 is located at the center of the outer cylinder 20, and includes an annular component 10-2 and multiple bucket segments 10-1; the outer cylindrical surface of the annular component 10-2 is fixedly fitted with a driven gear 10-2-1, and the driving gear 20-1 meshes with the driven gear 10-2-1 and is locked in the corresponding groove; the upper ends of the multiple bucket segments 10-1 are hinged to the lower circumferential position of the annular component 10-2 via corresponding lugs, and the outer wall of each bucket segment 10-1 is hinged to the outer wall of the annular component 10-2 via a battery push rod motor 10-3;

[0053] When centrifugal filtration is performed: multiple battery-powered push rod motors 10-3 extend to rotate multiple barrel segments 10-1 and close the bottom of the centrifugal barrel 10, forming a cone shape with a closed bottom, which facilitates centrifugal filtration. Then, the centrifugal motor drives the driven gear slot 10-2-1 to rotate via the drive gear 20-1, thereby driving the ring 10-2 to rotate, which in turn drives the cone-shaped bottom closed structure formed by the multiple barrel segments 10-1 to rotate. The oil in this cone-shaped structure is thrown onto the inner wall of the outer cylinder 20 under centrifugal action, thus achieving centrifugal separation.

[0054] After centrifugation, some of the remaining debris still adheres to the inner wall of the barrel segment 10-1. This debris needs to be removed to facilitate the next centrifugation. The operation is as follows: the barrel segment 10-1 is unfolded, and some of the debris falls directly to the middle of the pressure filtration mechanism 200. Most of the debris still adheres to the inner wall of the barrel segment 10-1. The pressure filtration mechanism 200 moves downward a certain position, and the centrifuge barrel 10 rotates again, which can throw the debris on the inner wall of the barrel segment 10-1 onto the inner wall of the outer cylinder 20 (the debris on this inner wall will slide down under the action of gravity and be collected by the pressure filtration mechanism 200).

[0055] See Figure 5 , Figure 6 The pressure filtration mechanism 200 is designed, which includes an upper tank 30 and a lower tank 40.

[0056] Specifically, the lower barrel 40 has an annular step in the middle of its inner wall, and the upper barrel 30 is placed on the annular step; the bottom of the upper barrel 30 has multiple through holes B, and a cotton filter cloth layer B30-2 is placed inside the bottom of the upper barrel 30, with silica gel sand 30-3 laid on the upper surface of the cotton filter cloth layer B30-2; and a flexible sealing ring 30-1 is provided at the upper edge of the upper barrel 30; in addition, the upper edge of the lower barrel 40 is a flange and a sealing layer is provided at the flange.

[0057] When the pressure filtration mechanism 200 is inserted into the centrifugal filtration mechanism 100 and performs pressure filtration: First, the upper barrel 30 is inserted into the lower end of the outer barrel 20, and the upper barrel 30 is fitted over the conical barrel formed by multiple barrel segments 10-1 with a gap between them; Second, the flexible sealing ring 30-1 is flexibly sealed against the inner wall of the outer barrel 20 to achieve a seal. In addition, the lower end of the outer barrel 20 abuts against the upper edge of the lower barrel 40 at a convenient sealing layer to achieve a seal again. Seal; Third, high-pressure, high-temperature gas is then introduced through the air inlet valve 20-3. The high-pressure, high-temperature gas enters the upper tank 30, pressurizing the oil collected in the upper tank 30 after centrifugal filtration. This oil flows through silica gel sand 30-3 and cotton filter layer B30-2. Water is absorbed by silica gel sand 30-3, and filtration is completed by silica gel sand 30-3 and cotton filter layer B30-2. At the same time, the high-temperature gas will evaporate the water in the thickened oil. Some of the pressurized filtered oil flows into the lower part of the lower tank 40.

[0058] In this embodiment, a level gauge 40-1 is provided on the lower outer side of the lower tank 40 to detect the condition of the stored oil.

[0059] See Figure 6 and Figure 7 An annular barrel 50 is placed inside the upper barrel 30. The annular barrel 50 is an annular groove, and the wall of its outer barrel part is fitted with the inner wall of the upper barrel 30. The wall of its inner barrel part has multiple through holes C. In addition, a bearing 60 is provided at the upper center of the annular barrel 50. The bearing 60 includes an inner ring 60-1 and an outer ring 60-2 adapted with thrust balls. The outer ring 60-2 is fixed to the annular barrel 50 by multiple support rods 50-1. The inner wall of the inner ring 60-1 is a cone shape that is larger at the top and smaller at the bottom.

[0060] When the pressure filtration mechanism 200 extends into the centrifugal filtration mechanism 100, the lower ends of the closed multiple barrel segments 10-1 abut against the conical inner wall of the inner ring 60-1 of the bearing component 60. This generates both radial and axial forces on the lower ends of the closed multiple barrel segments 60-1. The radial force makes the lower ends of the closed multiple barrel segments 60-1 less likely to separate, making them more secure. The axial upward force provides upward support to the multiple barrel segments 60-1. Thus, even if the multiple barrel segments 60-1 are hinged to the ring component 60-2 to form the centrifugal barrel 10 through corresponding lugs, the stability of the centrifugal barrel 10 can be guaranteed.

[0061] Of course, the primary purpose of setting up the annular barrel 50 is to collect impurities after centrifugal filtration within the centrifugal filtration mechanism 100. Specifically, when multiple barrel segments 10-1 close to form a cone shape, the heat transfer oil initially flows into this cone-shaped structure and then undergoes filtration under centrifugal action. The centrifuged oil is brushed and thrown onto the inner wall of the upper barrel 30 and eventually collects at the bottom of the upper barrel 30. However, many impurities still adhere to the cotton filter layer A on the inner wall of the barrel segment 10-1. The method for removing impurities from the cotton filter layer A in this scheme is as follows: S1, first, move the pressure filtration mechanism 100 downwards a certain position, but without disengaging it from the centrifugal filtration mechanism 100. The centrifugal filtration mechanism 100 ensures that the upper barrel 30 is not fitted outside the cone shape formed by multiple barrel segments 10-1. Then, the multiple barrel segments 10-1 are unfolded by the battery push rod motor 10-3. At this time, a large amount of debris is still adhering to the inner wall of the barrel segments 10-1. Then, the centrifugal barrel 10 rotates, causing the debris on the inner wall of the barrel segments 10-1 to be thrown onto the inner wall of the outer barrel 20. The debris on the inner wall of the outer barrel 20 will eventually fall into the annular cylinder 50 inside the upper barrel 30 (of course, the oil centrifuged during centrifugal filtration will also enter the annular cylinder 50, but will eventually flow to the bottom of the upper barrel 30 through the through hole C on the annular cylinder 50).

[0062] See Figure 5 In the pressure filtration mechanism 100, the lower tank 40 is placed on the base, which has rollers; and the base is placed on the lifting mechanism 70. The bottom of the base has a conical cavity that is smaller at the top and larger at the bottom. The lifting mechanism 70 is provided with a retractable top column 71, the upper end of which is also conical in shape. When the pressure filtration mechanism 200 is placed on the lifting mechanism 70, the top column 71 extends upward and fits against the conical cavity, so that the pressure filtration mechanism 200 is at the center of the lifting mechanism 70, forming a position adjustment structure for the pressure filtration mechanism.

[0063] This heat transfer oil circulation system utilizes a filtration system. During operation: (i) the lifting mechanism 70 is retracted until its upper surface is flush with the ground, and the pressure filter 200 is moved onto the lifting mechanism 70. The top column 71 rests against the conical cavity of the base, thus ensuring the position of the pressure filter 100 on the lifting mechanism 70; (ii) the lifting mechanism 70 is used to insert the pressure filter 200 upwards into the pressure filter 100, that is, to insert the upper barrel 30 into the outer barrel 20 and to allow the upper barrel 30 to... (iii) At this time, the air inlet valve is closed and the air outlet valve is open. Waste heat transfer oil is added through the oil inlet pipe 100-1. The waste heat transfer oil falls into the conical barrel formed by the closing of multiple barrel segments 10-1. Then, under the action of the centrifugal motor, the ring part 10-2 is driven to rotate. The ring part 10-2 drives the lower conical barrel formed by multiple barrel segments 10-1 to rotate. Since the lower part of the conical barrel abuts against the bearing part 60, the conical barrel can move smoothly. The oil in the conical barrel is thrown onto the inner wall of the upper barrel 30 under centrifugal force. After centrifugation, the oil flows along the corresponding wall into the annular barrel 50 and flows through the through hole C to the bottom of the upper barrel 30. After centrifugation, impurities are still attached to the inner wall of the conical barrel formed by multiple barrel segments 10-1; (iv) close the exhaust valve and open the intake valve. High-pressure gas enters the upper barrel 30 of the pressure filter mechanism 200 through the centrifugal filter mechanism 100. The gas pressure acts on the oil at the bottom of the upper barrel 30, making this The oil flows rapidly through silica gel sand 30-3 and cotton filter cloth layer 30-2 to achieve pressure filtration. Silica gel sand 30-3 also absorbs moisture from the oil. (V) After pressure filtration, the pressure filtration mechanism 200 is lowered by the lifting mechanism 70, so that the upper barrel 30 is no longer wrapped around the conical barrel formed by multiple barrel segments 10-1, but the upper barrel 30 does not detach from the outer cylinder 20. At this time, the air inlet valve 20-3 is closed and the air outlet valve 20-4 is opened. Then, the battery push rod motor 10-3 retracts, allowing the barrel segments 10-1 to unfold. Figure 2 As shown, after unfolding, most of the debris still adheres to the inner wall of the barrel segment 10-1 - only a small amount of debris falls to the center of the upper barrel 30. Then, the centrifugal motor drives the annular component 10-2 to rotate, realizing the rotation of multiple barrel segments 10-1. Finally, the debris adhering to the inner wall of the barrel segment 10-1 is thrown to the inner wall of the outer cylinder 20. Then, the multiple barrel segments 10-1 are closed, and the pressure filtration mechanism 200 rises. This causes the debris on the inner wall of the outer cylinder 20 to be scraped into the annular barrel 50, completing the collection of debris.

[0064] It should be noted that currently, the waste heat transfer oil generated in cement slurry thickening tests is basically discharged directly, which not only pollutes the environment but also leads to high test costs. Some factories or enterprises collect the heat transfer oil and let it stand for filtration, but this method is too time-consuming. In the field of filtration, there are some methods that use high pressure for filtration, but this approach is not very feasible in the field of heat transfer oil because the impurities in heat transfer oil are highly adhesive and can easily clog the filter pores under high pressure—the high pressure forces the impurities into the filter pores. Centrifugal filtration also exists in the field of filtration, but it is not very reliable for heat transfer oil filtration, again because the impurities in heat transfer oil are highly viscous and can easily adhere to the inner wall of the centrifuge.

[0065] Therefore, this solution first uses centrifugal filtration to allow a large amount of debris to adhere to the inner wall of the conical barrel formed by multiple barrel segments 10-1, and then performs pressure filtration. This results in very little debris on the silica gel sand 30-3 and cotton filter cloth layer 30-2 within the pressure filtration mechanism 200—making it less likely to clog the filter pores, reducing the need for replacement of the silica gel sand 30-3 and cotton filter cloth layer 30-2, and lowering the costs associated with replacement. Furthermore, when the conical barrel formed by the multiple barrel segments 10-1 unfolds, the difficult-to-clean debris adhering to the inner wall is thrown off by centrifugal force, eventually being scraped off and falling into the annular barrel 50. Therefore, this solution ensures both effective filtration and the proper removal of stubborn adhesive debris, guaranteeing the normal operation of the entire system.

[0066] Furthermore, once the pressure filtration mechanism 200 is completely separated from the centrifugal filtration mechanism 100, the debris in the annular barrel 50 can be emptied by a robotic arm, and then a clean annular barrel 50 can be placed back in. The entire heat transfer oil filtration process can be completed automatically.

[0067] (Experimental Example)

[0068] It should be noted that the mineral heat transfer oil used for chemical testing must meet the ISO 10426.2 (API 10.1) standard: 1. Specific gravity: 0.85 to 0.91 g / cm³ 3 2. Viscosity: 7 cSt to 75 cSt at 38℃; 3. Thermal conductivity: 0.119 W / (m·K) to 0.133 W / (m·K); 4. Free of moisture and impurities.

[0069] The basic properties of the mineral heat transfer oil currently used for thickening tests are shown in Table 1. The basic properties of the discarded mineral heat transfer oil used for thickening tests are shown in Table 2.

[0070] Table 1 Basic Properties of Mineral Heat Transfer Oil

[0071]

[0072]

[0073] Table 2 Basic Properties of Waste Mineral Heat Transfer Oil

[0074]

[0075] To verify the filtration effect of the device of the present invention, the waste mineral heat transfer oil used for thickening test was subjected to three filtration treatments (ordinary filtration, high-pressure filtration, and high-pressure plus centrifugal filtration): a. The basic properties of the waste mineral heat transfer oil used for thickening test after ordinary filtration are shown in Table 3. Figure 8 and Figure 9 b. The basic properties of the waste thickening test mineral heat transfer oil after high-pressure filtration are shown in Table 4. Figure 10 and Figure 11 c. The basic properties of the waste thickening test mineral heat transfer oil after high-pressure centrifugal filtration are shown in Table 5. Figure 12 and Figure 13 .

[0076] The comparison shows that the heat transfer oil obtained by the third method, high-pressure centrifugal filtration, has not only very high viscosity but also virtually no water content, resulting in excellent filtration performance. Furthermore, it meets the requirements of the ISO 10426.2 (API 10.1) standard for mineral heat transfer oils used in thickening tests.

[0077] Table 3 Basic properties of waste mineral heat transfer oil after ordinary filtration

[0078]

[0079] Table 4. Basic properties of waste mineral heat transfer oil after high-pressure filtration

[0080]

[0081] Table 5. Basic properties of waste mineral heat transfer oil after high-pressure centrifugal filtration.

[0082]

[0083] The above embodiments only illustrate preferred implementation methods, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this invention, and these all fall within the protection scope of this invention.

Claims

1. A heat transfer oil circulation and filtration system device for a high-temperature and high-pressure thickener, characterized in that: Includes a centrifugal filtration mechanism (100) and a pressure filtration mechanism (200); The centrifugal filter (1) is fixedly installed by a frame, with an oil inlet pipe (100-1) at the top and a centrifugal filter mechanism (100) that can move up and down below it. A rotatable centrifugal bucket (10) is provided inside the centrifugal filtration mechanism (100). The centrifugal bucket (10) is formed by multiple bucket segments (10-1) that can be opened and closed. Small holes A are opened on the bucket segments (10-1) and cotton filter cloth layer A is provided on their inner walls. The pressure filtration mechanism (200) is divided into an upper chamber and a lower chamber in the middle through a filter layer structure. When filtration is required: First, centrifugal filtration is performed, that is, the lower part of the centrifugal barrel (10) is closed by closing multiple barrel flaps (10-1), allowing the pressure filtration mechanism (200) to extend into the centrifugal filtration mechanism (100) and form a closed inner cavity after extension. The pressure filtration mechanism (200) is non-contactly fitted outside the centrifugal barrel (10), and waste heat transfer oil is introduced through the oil inlet pipe (100-1). The heat transfer oil falls into the closed centrifugal barrel (10), and then the centrifugal barrel (10) rotates to achieve centrifugal separation. The separated oil is thrown onto the inner wall of the upper cavity, and the oil finally collects on the upper surface of the filter layer. Then, pressure filtration is performed, that is, high-pressure high-temperature gas is added into the closed cavity formed after the pressure filtration mechanism (200) extends into the centrifugal filtration mechanism (100), allowing the oil to be filtered through the filter layer and finally collect in the lower cavity. When it is necessary to clean the impurities on the centrifugal filter mechanism (100): let the pressure filter mechanism (200) descend to a certain position without disengaging from the centrifugal filter mechanism (100), let the barrel flap (10-1) unfold, and then let the centrifugal barrel (10) rotate. Under the action of centrifugal force, the impurities on the cotton filter cloth layer A on the inner wall of the barrel flap (10-1) are thrown onto the inner wall of the centrifugal filter mechanism (100).

2. The heat transfer oil circulation and filtration system device for a high-temperature and high-pressure thickener according to claim 1, characterized in that: The centrifugal filtration mechanism (100) includes an outer cylinder (20) and a centrifugal tank (10); The centrifuge tank (10) is rotatably disposed inside the outer cylinder (20). The centrifuge tank (10) includes an annular part (10-2) and multiple tank segments (10-1). The lower end of the annular part (10-2) is hinged to the upper end of the corresponding multiple axially arranged tank segments (10-1) via multiple lugs. The outer wall of each tank segment (10-1) is hinged to the outer wall of the annular part (10-2) via a battery push rod motor (10-3). When multiple battery push rod motors (10-3) extend, they cause multiple barrel segments (10-1) to rotate and close the bottom of the centrifuge barrel (10), forming a structure that facilitates centrifugal filtration. When multiple battery push rod motors (10-3) retract, they cause multiple barrel segments (10-1) to rotate and open the bottom of the centrifuge barrel (10), forming a structure that facilitates the removal of debris from the inner wall of the barrel segments (10-1) by centrifugation.

3. The heat transfer oil circulation and filtration system device for a high-temperature and high-pressure thickener according to claim 2, characterized in that: In the centrifuge tank (10), the outer cylindrical surface of the annular part (10-2) is fixedly fitted with a driven toothed part (10-2-1); The outer cylinder (20) has an outwardly protruding cylindrical part in the middle. A drive gear (20-1) is installed in the protruding cylindrical part. The drive gear (20-1) meshes with the driven gear (10-2-1). The shaft of the drive gear (20-1) extends out of the protruding cylindrical part, and a pulley (20-2) is sleeved on the end of the shaft. The pulley (20-2) is connected to the centrifugal motor drive.

4. The heat transfer oil circulation and filtration system device for a high-temperature and high-pressure thickener according to claim 2, characterized in that: The upper end of the pressure filtration mechanism (200) is fitted with a flexible sealing ring (30-1). When it extends into the outer cylinder (20), the flexible sealing ring (30-1) contacts the inner wall of the outer cylinder (20) to form a sealing structure. The outer cylinder (20) is equipped with an air inlet valve (20-3) and an air outlet valve (20-4). The air inlet valve (20-3) is connected to a pressurized air source, and the air outlet valve (20-4) is connected to the atmosphere. When the air inlet valve (20-3) is closed and the air outlet valve (20-4) is open, the centrifugal filter mechanism (100) performs filtration. When the air inlet valve (20-3) is open and the air outlet valve (20-4) is closed, the pressure filter mechanism (200) performs filtration.

5. The heat transfer oil circulation and filtration system device for a high-temperature and high-pressure thickener according to claim 1, 2, or 4, characterized in that: The pressurized filtration mechanism (200) includes an upper tank (30) and a lower tank (40); The lower bucket (40) has an annular step in the middle of its inner wall, and the upper bucket (30) is placed on the annular step. The bottom of the upper barrel (30) has multiple through holes B. A cotton filter cloth layer B (30-2) is placed inside the bottom of the upper barrel (30). The upper surface of the cotton filter layer B (30-2) is covered with silica gel sand (30-3). A flexible sealing ring (30-1) is provided at the upper edge of the upper barrel (30). When the upper barrel (30) is inserted into the centrifugal filtration mechanism (100), the flexible sealing ring (30-1) fits against the inner wall of the centrifugal filtration mechanism (100).

6. The heat transfer oil circulation and filtration system device for a high-temperature and high-pressure thickener according to claim 5, characterized in that: The upper edge of the lower bucket (40) is a flange and the flange has a sealing layer. When the pressure filtration mechanism (200) extends into the centrifugal filtration mechanism (100), the lower end of the centrifugal filtration mechanism (100) abuts against the sealing layer of the flange. The lower tank (40) is equipped with a level gauge (40-1) on its lower outer side.

7. The heat transfer oil circulation and filtration system device for a high-temperature and high-pressure thickener according to claim 5, characterized in that: An annular barrel (50) is placed close to the inner wall of the upper barrel (30). The inner wall of the annular barrel (50) has multiple through holes C, forming a filter screen wall. When the multiple barrel segments (10-1) unfold and the debris on the inner wall of the centrifuge barrel (10) is removed by centrifugation, the debris eventually falls into the annular barrel (50); A bearing component (60) is provided at the center of the upper inner part of the annular barrel (50). The bearing component (60) includes an inner ring (60-1) and an outer ring (60-2) adapted with thrust balls. The outer ring (60-2) is fixed on the annular barrel (50) by multiple support rods (50-1). The inner wall of the inner ring (60-1) is a cone shape with a larger upper part and a smaller lower part. When the centrifuge barrel (10) is closed, it is a cone shape with a larger upper part and a smaller lower part. After it is closed, its lower end abuts against the inner wall of the inner ring (60-1), forming a structure that supports the lower end of the centrifuge barrel (10).

8. The heat transfer oil circulation and filtration system device for a high-temperature and high-pressure thickener according to claim 5, characterized in that: In the pressurized filtration mechanism (200), the lower tank (40) is placed on a base, and the base has rollers; The base is placed on the lifting mechanism (70). The bottom of the base has a conical cavity that is smaller at the top and larger at the bottom. A retractable top column (71) is provided on the lifting mechanism (70). The upper end of the top column (71) is also conical in shape, smaller at the top and larger at the bottom. When the pressure filter mechanism (200) is placed on the lifting mechanism (70), the top column (71) extends upward and fits against the conical cavity, so that the pressure filter mechanism (200) is at the center of the lifting mechanism (70), forming a position adjustment structure for the pressure filter mechanism.

9. The heat transfer oil circulation and filtration system device for a high-temperature and high-pressure thickener according to claim 8, characterized in that: The lifting mechanism (70) is placed in the recess (300) opened on the bottom surface. When the lifting mechanism (70) retracts, the upper surface of the lifting mechanism (70) is flush with the bottom surface. Then the top column (71) retracts, making it easy for the pressure filter mechanism (200) to be moved away.

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