Polymer drag reducer premixer and use method thereof

Abstract

The invention belongs to the field of oil exploitation, and discloses a polymer drag reducer premixer, which comprises a premixer main body and a self-adjusting assembly, the premixer main body comprises a liquid inlet cavity, a powder inlet cavity and a mixing cavity, the liquid inlet cavity and the powder inlet cavity are both communicated with the mixing cavity, the liquid inlet cavity and the powder inlet cavity are both arranged at the upper end of the premixer main body, and the self-adjusting assembly is arranged at the lower end of the premixer main body. The liquid inlet cavity is annularly arranged on the outer wall of the powder inlet cavity, the mixing cavity is arranged at the bottoms of the powder inlet cavity and the liquid inlet cavity, the self-adjusting assembly comprises a liquid stopping component and a powder stopping component, the liquid stopping component and the powder stopping component rotate in a meshed mode, the liquid stopping component is arranged in the liquid inlet cavity, and the powder stopping component is arranged in the powder inlet cavity. The self-adjusting assembly comprises a liquid stopping component and a powder stopping component, the functions of pre-wetting and conveying powder through water flow are reserved, and meanwhile the problem that a powder conveying system breaks down due to the fact that fluid flows upwards due to unsmooth accidental conveying is effectively solved.

Description

Technical Field

[0001] The invention belongs to the field of petroleum exploitation, and in particular relates to a polymer drag reducer premixer and a use method thereof. Background Art

[0002] Polymer drag reducer is a powdered solid with a common particle size of 80-100 mesh. It has excellent water absorption and will quickly dissolve in water to form a highly viscous fluid or agglomerate. The current rapid mixing process is to pre-mix the powder by contacting it with water flow, and then use the water flow to bring the water-powder mixture into the dispersion mixing node to achieve rapid and uniform mixing of the water-powder mixture.

[0003] However, due to the huge demand for mixing and the limited space for premixing, the powder cannot enter the mixing node in time to be discharged after being wetted to form flocs. The liquid level in the premixing space rises rapidly and often rises to the powder inlet channel, causing the powder delivery system to fail. The residue is difficult to remove and the resumption of production is very slow. The current coping methods are to manually observe the overflow of the pipeline, stop the powder supply accordingly or improve the energy efficiency of the mixing node to solve the problem of stacking blockage. However, this method is time-consuming and labor-intensive, affects production efficiency, and is prone to operational problems. It requires high manual control, and the use of automated sensing technology for control is often difficult to achieve due to limited space. In addition, since the flow rate of the fluid increases after entering the mixing node, a fluid vortex will appear in the premixing space. On the one hand, the vortex will inhale a large amount of air, resulting in a large number of tiny bubbles in the mixed liquid, affecting the use effect of the mixed liquid; on the other hand, the vortex will cause the air flow in the premixing space to be chaotic, causing the falling powder to float around and adhere to other parts to cause blockage, seriously affecting the operation effect. Summary of the invention

[0004] In view of the above problems, the present invention proposes a polymer drag reducer premixer, comprising a premixer body and a self-adjusting component, wherein the premixer body comprises a liquid inlet chamber 、 A powder inlet chamber and a mixing chamber, the liquid inlet chamber and the powder inlet chamber are both connected to the mixing chamber, the liquid inlet chamber and the powder inlet chamber are both arranged at the upper end of the premixer body, the liquid inlet chamber annulus is arranged on the outer wall of the powder inlet chamber, the mixing chamber is arranged at the bottom of the powder inlet chamber and the liquid inlet chamber, the self-adjusting component includes a liquid stopping component and a powder stopping component, the liquid stopping component is meshed and rotated with the powder stopping component, the liquid stopping component is arranged in the liquid inlet chamber, and the powder stopping component is arranged in the powder inlet chamber.

[0005] Furthermore, it also includes a racemization structure, which is arranged at the lower end of the mixing chamber.

[0006] Furthermore, the premixer body also includes a liquid replenishment chamber, the liquid replenishment chamber annulus is arranged on the inner wall of the premixer body, the liquid inlet chamber is arranged between the liquid replenishment chamber and the powder inlet chamber, a plurality of through holes are arranged on the partition between the liquid replenishment chamber and the liquid inlet chamber, and the liquid replenishment chamber and the liquid inlet chamber are connected through the plurality of through holes on the partition.

[0007] Furthermore, the liquid-stopping component includes a liquid-stopping plate, a support rod, an outer ring of a float, a connecting rod and an inner ring of a float, a number of the liquid-stopping plates are respectively arranged on a number of support rods, a number of the support rods are all arranged on the outer ring of the float, the installation positions of the number of liquid-stopping plates correspond one-to-one to a number of through holes on the partition, the outer ring of the float contacts the partition between the liquid replenishment chamber and the liquid inlet chamber, the inner ring of the float contacts the outer wall of the powder inlet chamber, two racks are relatively arranged at the upper end of the inner ring of the float close to the powder inlet chamber, and the connecting rod is arranged between the outer ring of the float and the inner ring of the float.

[0008] Furthermore, the powder stopping component includes a first transmission gear, a second transmission gear and a powder feeding sealing fan blade. The two first transmission gears are relatively arranged on the inner wall of the powder feeding chamber. The two first transmission gears are respectively connected to the two racks on the inner ring of the floating ring. The two second transmission gears are respectively located under the two first transmission gears and are respectively meshed with the two first transmission gears. The two powder feeding sealing fan blades are respectively connected to the two second transmission gears.

[0009] Furthermore, it also includes a sensing component, which includes a pressure contact, a pressure sensing head and a pressure sensing controller. The pressure contact is arranged on the top of the inner ring of the floating ring, and the pressure sensing head is arranged on the inner wall of the top of the premixer body. The pressure contact corresponds to the position of the pressure sensing head. The pressure sensing controller is arranged on the outer wall of the top of the premixer body, and the pressure sensing controller is electrically connected to the pressure sensing head.

[0010] Furthermore, the premixer body is a double-layer structure in the form of an upper cylinder and a lower cone, the liquid inlet chamber and the powder inlet chamber are arranged in the upper cylindrical structure, the mixing chamber is arranged in the lower cone structure, and a discharge port is arranged at the bottom of the premixer body.

[0011] Furthermore, a jet plate is arranged between the liquid inlet chamber and the mixing chamber, and a plurality of through holes are arranged on the jet plate, and the total area of ​​the plurality of through holes is greater than or equal to the cross-sectional area of ​​the discharge port of the premixer body.

[0012] Furthermore, a plurality of through holes are arranged on the partition between the liquid replenishing chamber and the liquid inlet chamber, and the total area of ​​the plurality of through holes is greater than or equal to the cross-sectional area of ​​the discharge port of the premixer body.

[0013] The present application also proposes a method for using the above-mentioned polymer drag reducer premixer:

[0014] First, the liquid enters the liquid replenishing chamber in the premixer body, and then the liquid enters the mixing chamber connected thereto;

[0015] Then the powdered polymer enters the mixing chamber connected to it through the powder inlet chamber, and the powdered polymer is premixed with the liquid. After the premixing, the powder and liquid are transported to the next process;

[0016] When there is a problem in the conveying process, the premixed powder and liquid will accumulate in the mixing chamber. As the accumulated powder and liquid increase, the liquid will flow back and be stored in the liquid replenishment chamber.

[0017] The liquid-stopping component rises due to the buoyancy of the liquid in the liquid replenishing chamber, and the liquid-stopping component rises to the water inlet of the liquid replenishing chamber to block it, thereby preventing the liquid from entering the liquid inlet chamber;

[0018] Since the liquid-stopping component and the powder-stopping component are meshed and driven, the powder-stopping component blocks the powder-inlet cavity during the rising process of the liquid-stopping component, thereby preventing the powder-inlet cavity from entering;

[0019] When the conveying process returns to normal, the liquid level in the liquid replenishing chamber drops, and the liquid stopping component drops accordingly, unsealing the water inlet of the liquid replenishing chamber to achieve normal liquid inlet. During the descent of the liquid stopping component, the powder stopping component unseals the powder inlet chamber to achieve normal powder inlet.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The present application sets a self-regulating component in the main body of the premixer, wherein the self-regulating component includes a liquid-stopping component and a powder-stopping component. While retaining the function of pre-wetting and conveying the powder by water flow, the present application combines the previous operation method for dealing with the problem of rising liquid level, and realizes the automatic regulation of the water intake by the liquid-stopping component and the automatic regulation of the powder delivery amount by the powder-stopping component when the liquid level in the premixing space rises abnormally, thereby reducing the pressure at the mixing node. After the discharge is normal, the liquid level returns to normal, and the powder and water delivery also automatically returns to normal. The present invention effectively solves the problem of fluid upward surges due to accidental poor delivery, thereby paralyzing the powder delivery system.

[0022] 2. This application effectively eliminates the vortex formed during operation by adding a racemic structure in the mixing chamber without affecting normal operation. At the same time, it greatly reduces the bubble content of the mixed liquid, reduces internal dust adhesion, eliminates the need for manual intervention, and does not require automation technology. The technical principle is simple and the cost is low, which provides effective technical support for the rapid mixing process of fracturing fluid drag reducers.

[0023] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A schematic diagram of a premixer body in an embodiment of the present invention is shown;

[0026] Figure 2 AA cross-sectional view of the premixer body in an embodiment of the present invention is shown;

[0027] Figure 3 The AA perspective view of the premixer body in an embodiment of the present invention is shown;

[0028] Figure 4 A schematic diagram of a powder inlet and isolation fan blade in an embodiment of the present invention is shown.

[0029] In the figure, 1. premixer body; 11. liquid replenishing chamber; 12. liquid inlet chamber; 13. powder inlet chamber; 14. mixing chamber; 15. jet plate; 16. discharge port; 2. self-adjusting component; 21. liquid stop component; 211. liquid stop plate; 212. support rod; 213. outer ring of floating ring; 214. connecting rod; 215. inner ring of floating ring; 22. powder stop component; 221. first transmission gear; 222. second transmission gear; 223. powder inlet sealing fan blade; 3. de-rotation structure; 4. sensor component; 41. pressure contact; 42. pressure sensor head; 43. pressure sensor controller. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] like Figure 1 As shown, a polymer drag reducer premixer includes a premixer body 1 and a self-adjusting component 2, such as Figure 2As shown, the premixer body 1 comprises a liquid inlet chamber 12, a powder inlet chamber 13 and a mixing chamber 14, wherein the liquid inlet chamber 12 and the powder inlet chamber 13 are both connected to the mixing chamber 14, and the liquid inlet chamber 12 and the powder inlet chamber 13 are both arranged at the upper end of the premixer body 1, the annulus of the liquid inlet chamber 12 is arranged on the outer wall of the powder inlet chamber 13, and the mixing chamber 14 is arranged at the bottom of the powder inlet chamber 13 and the liquid inlet chamber 12, and the self-adjusting component 2 comprises a liquid stop component 21 and a powder stop component 22, wherein the liquid stop component 21 is meshed and rotated with the powder stop component 22, and the liquid stop component 21 is arranged in the liquid inlet chamber 12, and the powder stop component 22 is arranged in the powder inlet chamber 13.

[0032] The premixer body 1 is a double-layer structure in the form of an upper cylinder and a lower cone. The liquid inlet chamber 12 and the powder inlet chamber 13 are arranged in the upper cylindrical structure, the mixing chamber 14 is arranged in the lower cone structure, and a discharge port 16 is arranged at the bottom of the cone.

[0033] The premixer body 1 also includes a liquid replenishment chamber 11, the annulus of which is arranged on the inner wall of the premixer body 1, the liquid inlet chamber 12 is arranged between the liquid replenishment chamber 11 and the powder inlet chamber 13, a plurality of through holes are arranged on the partition between the liquid replenishment chamber 11 and the liquid inlet chamber 12, and the liquid replenishment chamber 11 and the liquid inlet chamber 12 are connected through the plurality of through holes on the partition.

[0034] The shape of the premixer body 1 is a double-layer structure with an upper cylinder and a lower cone. The annulus of the liquid replenishment chamber 11 is arranged on the inner wall of the premixer body 1. After removing the space of the liquid replenishment chamber 11, the premixer body 1 is divided into an upper layer and a lower layer. The upper layer is provided with a liquid inlet chamber 12 adjacent to the liquid replenishment chamber 11, and the powder inlet chamber 13 is arranged in the center of the upper layer. The lower layer is a mixing chamber 14, and the bottom of the lower layer is a discharge port 16.

[0035] The liquid inlet chamber 12 is separated from the mixing chamber 14. In some embodiments, a jet plate 15 is disposed between the liquid inlet chamber 12 and the mixing chamber 14. The jet plate 15 is provided with a plurality of through holes (such as Figure 3 As shown), the sum of the areas of the plurality of through holes is greater than or equal to the cross-sectional area of ​​the discharge port 16 of the premixer body 1.

[0036] A liquid inlet is disposed at the lower end of the liquid replenishing chamber 11 , which is communicated with the liquid replenishing chamber 11 and continuously supplies water to the liquid replenishing chamber 11 .

[0037] A plurality of through holes are arranged on the partition between the liquid replenishing chamber 11 and the liquid inlet chamber 12, and the sum of the areas of the plurality of through holes is greater than or equal to the cross-sectional area of ​​the discharge port 16 of the premixer body 1. The polymer powder has excellent water absorption and will quickly dissolve in water to form a fluid or mass with high viscosity. The sum of the through hole areas is greater than the cross-sectional area of ​​the discharge port 16 to allow water and the polymer powder to be fully mixed.

[0038] The water in the liquid replenishing chamber 11 enters the liquid inlet chamber 12 through the through holes on the partition plate. The water in the liquid inlet chamber 12 enters the mixing chamber 14 through a plurality of through holes provided on the jet plate 15, and mixes with the polymer powder entering the mixing chamber 14.

[0039] It is used in the premixing link of the rapid mixing process of polymer drag reducer to premix water and powder for the rapid mixing of polymer drag reducer. The mixed solution, generally an aqueous solution, flows into the outer annular liquid replenishment chamber 11 of the premixer body 1 through the liquid inlet, and the aqueous solution flows into the liquid inlet chamber 12 through the through hole on the partition plate between the liquid replenishment chamber 11 and the liquid inlet chamber 12, and then forms a jet water column through the through hole on the jet plate 15 and enters the mixing chamber 14; the mixed powder is input into the mixing chamber 14 through the powder inlet chamber 13, and is premixed with the input mixed solution, and then the mixture flows out through the discharge port 16 at the bottom of the premixer body 1.

[0040] The mixing chamber 14 further comprises a de-racemization structure 3, which is arranged at the lower end of the mixing chamber 14. The fluid entering the lower part of the mixing chamber 14 cannot form a swirl state under the flow blocking effect of the de-racemization structure 3, and the fluid vortex is eliminated.

[0041] The racemization structure 3 is a plurality of rectangular or diamond-shaped plate-like structures, which are arranged at intervals on the inner wall of the lower end of the mixing chamber 14. The length of the plate-like structure is less than or equal to the cone length of the mixing chamber 14, the thickness is 1-2 mm, the width does not exceed one tenth of the maximum diameter of the mixing chamber 14, the number of the plate-like structures distributed around the circumference is 4-8, and the plate-like structures are fixed perpendicular to the inner wall of the mixing chamber 14 in the width direction.

[0042] The self-adjusting component 2 includes a liquid-stopping component 21 and a powder-stopping component 22 . The liquid-stopping component 21 is disposed in the liquid inlet cavity 12 , and the powder-stopping component 22 is disposed in the powder inlet cavity 13 .

[0043] The liquid-stopping component 21 includes a liquid-stopping plate 211, a support rod 212, a float outer ring 213, a connecting rod 214 and a float inner ring 215. A number of the liquid-stopping plates 211 are respectively arranged on a number of support rods 212, and a number of the support rods 212 are arranged on the float outer ring 213. The installation positions of the number of liquid-stopping plates 211 correspond one-to-one to the number of through holes on the partition. The float outer ring 213 contacts the partition between the liquid replenishment chamber 11 and the liquid inlet chamber 12, and the float inner ring 215 contacts the outer wall of the powder inlet chamber 13. Two racks are relatively arranged at the upper end of the float inner ring 215 close to the powder inlet chamber 13, and the connecting rod 214 is arranged between the float outer ring 213 and the float inner ring 215.

[0044] When a process failure occurs after the premixing stage, resulting in the inability to discharge the fluid in the premixing stage normally from the discharge port 16 at the bottom, since the mixed fluid at the bottom of the premixer body 1 cannot be discharged, the upper powder inlet chamber 13 and the liquid inlet chamber 12 continue to feed powder and liquid into the mixing chamber 14, which will eventually cause the mixing chamber 14 to be filled with fluid, and the liquid entering the upper part of the liquid inlet chamber 12 will accumulate in the liquid inlet chamber 12, and the liquid level in the liquid inlet chamber 12 will rise rapidly.

[0045] The inner ring 215 and the outer ring 213 of the float ring rise synchronously under the action of the buoyancy of the liquid and the connecting rod 214. When reaching the preset position, the support rod 212 arranged on the outer ring 213 of the float ring will raise the liquid stop plate 211 together. The support rod 212 is hinged to the liquid stop plate 211. The liquid stop plate 211 and the support rod 212 are installed at an angle. The upper end of the liquid stop plate 211 is close to the partition, and the lower end of the liquid stop plate 211 is far away from the partition. The number of the liquid stop plate 211 is the same as the number of through holes on the partition. If there is only one through hole on the partition, If there is a through hole, a liquid stop plate 211 is set. If there are multiple through holes on the partition, multiple liquid stop plates 211 are set. The positions of the multiple liquid stop plates 211 are set corresponding to the positions of the through holes on the partition. When the liquid stop plate 211 rises to the position of the through hole on the partition between the liquid replenishment chamber 11 and the liquid inlet chamber 12, the upper end of the liquid stop plate 211 enters the through hole first. During the gradual rising process, the liquid stop plate 211 rotates slightly relative to the support plate until the through hole is blocked, thereby limiting the liquid from continuing to enter the liquid inlet chamber 12 from the liquid replenishment chamber 11.

[0046] The maximum diameter of the outer ring 213 of the float is consistent with the diameter of the cylinder of the premixing chamber body, and the minimum diameter of the inner ring 215 of the float is consistent with the outer wall diameter of the powder inlet chamber 13. The materials used for the outer ring 213 and the inner ring 215 of the float include but are not limited to solid materials that have buoyancy after inflation or have a density less than water. The thickness of the outer layer and the inner layer is related to the buoyancy required by the structural design.

[0047] The powder stopping component 22 includes a first transmission gear 221, a second transmission gear 222 and a powder feeding sealing blade 223. The two first transmission gears 221 are relatively arranged on the inner wall of the powder feeding chamber 13. The two first transmission gears 221 are respectively connected to the two racks on the inner ring 215 of the floating ring. The two second transmission gears 222 are respectively located under the two first transmission gears 221 and are respectively meshed with the two first transmission gears 221. The two powder feeding sealing blades 223 are respectively connected to the two second transmission gears 222.

[0048] During the rising process of the inner ring 215 of the floating ring, the two racks on the inner ring 215 of the floating ring gradually mesh with the two opposite first transmission gears 221, and the two first transmission gears 221 respectively drive the two second transmission gears 222 meshing therewith to rotate, and the two second transmission gears 222 respectively drive the powder feeding sealing blades 223 fixedly connected therewith to rotate, and the two powder feeding sealing blades 223 gradually rotate from a direction perpendicular to the ground to a direction parallel to the ground with the second transmission gears 222 as the rotation axis. At this time, the two powder feeding sealing blades 223 are in a closed state to prevent powder from falling.

[0049] like Figure 4 As shown, the first transmission gear 221 and the second transmission gear 222 are fixed at the opening of the powder feeding chamber 13, the powder feeding sealing blade 223 is semicircular, and the radius of the semicircle is the same as the radius of the powder feeding chamber 13. The two powder feeding sealing blades 223 are arranged opposite to each other, that is, the straight ends of the semicircles are in contact with each other when closed, and the middle of the semicircle arc is fixedly connected to the second transmission gear 222. The powder feeding sealing blade 223 uses the second transmission gear 222 as the rotation axis, and the first transmission gear 221 drives the second transmission gear 222 to realize forward rotation. When the inner ring 215 of the floating ring rises, it drives the first transmission gear 221 to rotate forward, and the first transmission gear 221 drives the second transmission gear 222 to rotate backward, and the two powder feeding sealing blades 223 rotate from a direction perpendicular to the ground to a direction parallel to the ground to achieve closing; when the inner ring 215 of the floating ring falls, it drives the first transmission gear 221 to rotate backward, and the first transmission gear 221 drives the second transmission gear 222 to rotate forward, and the two powder feeding sealing blades 223 rotate from a direction parallel to the ground to a direction perpendicular to the ground to achieve unsealing.

[0050] The sensor component 4 includes a pressure contact 41, a pressure sensing head 42 and a pressure sensing controller 43. The pressure contact 41 is arranged on the top of the inner ring 215 of the floating ring, and the pressure sensing head 42 is arranged on the top inner wall of the premixer body 1. The pressure contact 41 and the pressure sensing head 42 correspond to each other in position. The pressure sensing controller 43 is arranged on the top outer wall of the premixer body 1, and the pressure sensing controller 43 is electrically connected to the pressure sensing head 42.

[0051] When the inner ring 215 of the float rises to the preset dangerous liquid level, the pressure contact 41 contacts the pressure sensor head 42, and the pressure sensor head 42 transmits the liquid level buoyancy to the pressure sensor controller 43 through an electrical signal. After receiving the excitation signal, the pressure sensor controller 43 sends an alarm signal to the control system to stop the external water supply and powder supply links.

[0052] When the liquid level of the mixing chamber 14 in the premixer body 1 drops to normal, the inner ring 215 and the outer ring 213 of the floating ring drop, the liquid stop plate 211 and the powder inlet sealing blade 223 open normally, and the water inlet and powder inlet return to normal.

[0053] The present application also proposes a method for using the polymer drag reducer premixer:

[0054] First, the liquid enters the liquid replenishing chamber 12 in the premixer body 1, and then the liquid enters the mixing chamber 14 connected thereto;

[0055] Then the powdered polymer enters the mixing chamber 14 connected thereto through the powder inlet chamber 13, and the powdered polymer is premixed with the liquid, and after the premixing, the powder and liquid are transported to the next process;

[0056] When there is a problem in the conveying process, the premixed powder and liquid will accumulate in the mixing chamber 14. As the accumulated powder and liquid increase, the liquid will flow back and be stored in the liquid replenishing chamber 12.

[0057] The liquid stopping component 21 rises due to the buoyancy of the liquid in the liquid replenishing chamber 12, and the liquid stopping component 21 rises to the water inlet of the liquid replenishing chamber 12 to block it, thereby preventing the liquid from entering the liquid inlet chamber 12;

[0058] Since the liquid-stopping component 21 and the powder-stopping component 22 are meshed and driven, the powder-stopping component 22 blocks the powder-inlet chamber 13 during the rising process of the liquid-stopping component 21, thereby preventing the powder-inlet chamber 13 from entering the powder-inlet chamber 13;

[0059] When the conveying process returns to normal, the liquid level in the liquid replenishing chamber 12 drops, and the liquid stopping component 21 drops accordingly, unsealing the water inlet of the liquid replenishing chamber 12 to achieve normal liquid inlet. During the descending process of the liquid stopping component 21, the powder stopping component 22 unseals the powder inlet chamber 13 to achieve normal powder inlet.

[0060] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A polymer drag reducer premixer, characterized in that: The invention comprises a premixer body (1) and a self-adjusting component (2), wherein the premixer body (1) comprises a liquid inlet chamber (12) 、 A powder inlet chamber (13) and a mixing chamber (14), wherein the liquid inlet chamber (12) and the powder inlet chamber (13) are both connected to the mixing chamber (14), the liquid inlet chamber (12) and the powder inlet chamber (13) are both arranged at the upper end of the premixer body (1), the annulus of the liquid inlet chamber (12) is arranged on the outer wall of the powder inlet chamber (13), the mixing chamber (14) is arranged at the bottom of the powder inlet chamber (13) and the liquid inlet chamber (12), the self-adjusting component (2) comprises a liquid stop component (21) and a powder stop component (22), the liquid stop component (21) and the powder stop component (22) are meshed and rotated, the liquid stop component (21) is arranged in the liquid inlet chamber (12), and the powder stop component (22) is arranged in the powder inlet chamber (13).

2. The polymer drag reducer premixer according to claim 1, characterized in that: It also comprises a racemization structure (3), wherein the racemization structure (3) is arranged at the lower end of the mixing chamber (14).

3. The polymer drag reducer premixer according to claim 1, characterized in that: The premixer body (1) further comprises a liquid replenishing chamber (11), the liquid replenishing chamber (11) annularly arranged on the inner wall of the premixer body (1), the liquid inlet chamber (12) arranged between the liquid replenishing chamber (11) and the powder inlet chamber (13), a plurality of through holes arranged on a partition between the liquid replenishing chamber (11) and the liquid inlet chamber (12), and the liquid replenishing chamber (11) and the liquid inlet chamber (12) are connected via the plurality of through holes on the partition.

4. The polymer drag reducer premixer according to claim 3, characterized in that: The liquid-stopping component (21) comprises a liquid-stopping plate (211), a support rod (212), a floating ring outer ring (213), a connecting rod (214) and a floating ring inner ring (215); a plurality of the liquid-stopping plates (211) are respectively arranged on a plurality of the support rods (212); a plurality of the support rods (212) are all arranged on the floating ring outer ring (213); the installation positions of the plurality of the liquid-stopping plates (211) correspond one by one to a plurality of through holes on the partition plate; the floating ring outer ring (213) contacts the partition plate between the liquid replenishing chamber (11) and the liquid inlet chamber (12); the floating ring inner ring (215) contacts the outer wall of the powder inlet chamber (13); two racks are arranged opposite to each other at the upper end of the floating ring inner ring (215) close to the powder inlet chamber (13); and the connecting rod (214) is arranged between the floating ring outer ring (213) and the floating ring inner ring (215).

5. The polymer drag reducer premixer according to claim 4, characterized in that: The powder stopping component (22) comprises a first transmission gear (221), a second transmission gear (222) and a powder feeding sealing blade (223); the two first transmission gears (221) are arranged opposite to each other on the inner wall of the powder feeding chamber (13); the two first transmission gears (221) are respectively connected to two racks on the inner ring (215) of the floating ring; the two second transmission gears (222) are respectively located below the two first transmission gears (221) and are respectively meshed with the two first transmission gears (221); and the two powder feeding sealing blades (223) are respectively connected to the two second transmission gears (222).

6. The polymer drag reducer premixer according to claim 4, characterized in that: The invention also comprises a sensing component (4), wherein the sensing component (4) comprises a pressure contact (41), a pressure sensing head (42) and a pressure sensing controller (43), wherein the pressure contact (41) is arranged at the top of the inner ring (215) of the floating ring, the pressure sensing head (42) is arranged on the inner wall at the top of the premixer body (1), the pressure contact (41) and the pressure sensing head (42) correspond in position, the pressure sensing controller (43) is arranged on the outer wall at the top of the premixer body (1), and the pressure sensing controller (43) is electrically connected to the pressure sensing head (42).

7. The polymer drag reducer premixer according to claim 3, characterized in that: The premixer body (1) is a double-layer structure in the form of an upper cylinder and a lower cone, the liquid inlet chamber (12) and the powder inlet chamber (13) are arranged in the upper cylindrical structure, the mixing chamber (14) is arranged in the lower cone structure, and a discharge port (16) is arranged at the bottom of the premixer body.

8. The polymer drag reducer premixer according to claim 7, characterized in that: A jet plate (15) is arranged between the liquid inlet chamber (12) and the mixing chamber (14), and a plurality of through holes are arranged on the jet plate (15), wherein the total area of ​​the plurality of through holes is greater than or equal to the cross-sectional area of ​​the discharge port (16) of the premixer body (1).

9. The polymer drag reducer premixer according to claim 7, characterized in that: A plurality of through holes are arranged on the partition between the liquid replenishing chamber (11) and the liquid inlet chamber (12), and the total area of ​​the plurality of through holes is greater than or equal to the cross-sectional area of ​​the discharge port (16) of the premixer body (1).

10. A method for using the polymer drag reducer premixer according to any one of claims 1 to 9, characterized in that: First, the liquid enters the liquid replenishing chamber (12) in the premixer body (1), and then the liquid enters the mixing chamber (14) connected thereto; Then the powdered polymer enters the mixing chamber (14) connected thereto through the powder inlet chamber (13), the powdered polymer is premixed with the liquid, and after the premixing, the powder and liquid are transported to the next process; When a problem occurs in the conveying process, the premixed powder and liquid will accumulate in the mixing chamber (14). As the accumulated powder and liquid increase, the liquid will flow back and be stored in the liquid replenishing chamber (12). The liquid stopping component (21) rises due to the buoyancy of the liquid in the liquid replenishing chamber (12), and the liquid stopping component (21) rises to the water inlet of the liquid replenishing chamber (12) to block it, thereby preventing the liquid from entering the liquid inlet chamber (12); Since the liquid-stopping component (21) and the powder-stopping component (22) are meshed and driven, the powder-stopping component (22) blocks the powder-feeding chamber (13) during the upward movement of the liquid-stopping component (21), thereby preventing the powder-feeding chamber (13) from feeding powder; When the conveying process returns to normal, the liquid level in the liquid replenishing chamber (12) drops, and the liquid stopping component (21) drops accordingly, unsealing the water inlet of the liquid replenishing chamber (12) to achieve normal liquid inlet. During the process of the liquid stopping component (21) descending, the powder stopping component (22) unseales the powder inlet chamber (13) to achieve normal powder inlet.

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