Polyacrylamide dry powder mixing equipment

Abstract

The invention relates to the technical field of polymer solution preparation devices used in the field of petroleum development, and particularly discloses polyacrylamide dry powder mixing equipment which comprises a powder storage device, a solution preparation device and a mixing device. The powder storage device comprises a powder storage tank, the powder storage tank is provided with a powder inlet and a powder outlet, and the powder outlet is connected with a powder outlet pipe. The liquid preparation device is connected with a liquid conveying pipeline, one end of the liquid conveying pipeline is connected with a liquid conveying pump, the other end of the liquid conveying pipeline is connected with a liquid preparation bent pipe, the liquid preparation bent pipe comprises a first pipe section and a second pipe section, and the first pipe section and the second pipe section are arranged in a bent mode. The first pipe section is connected with a liquid conveying pipeline, the powder outlet pipe is obliquely connected with a second pipe section, the second pipe section is connected with a venturi pipe, the pipe diameter of the venturi pipe is gradually increased in the direction deviating from the liquid preparation bent pipe, and the end, deviating from the liquid preparation bent pipe, of the venturi pipe is connected with a mixing device. The preparation method has the effect of reducing the probability of occurrence of polyacrylamide powder caking or non-uniform powder-liquid mixing during preparation of the polyacrylamide solution.

Description

Technical Field

[0001] The present application relates to the technical field of polymer solution preparation devices used in the field of petroleum development, and in particular to a polyacrylamide dry powder mixing device. Background Art

[0002] Water injection for oil recovery is a commonly used method to improve oil recovery efficiency during the oil recovery process. The principle of water injection for oil recovery is to inject water into the oil layer to supplement the oil layer pressure and drive the crude oil to flow to the production well, thereby improving oil recovery efficiency.

[0003] In the process of oil development, as the progress of oil field development gradually advances, the water content in the reservoir will also increase. When entering the late stage of oil production, the oil field enters a period of high water content, and water injection and oil recovery can no longer meet the needs of improving oil recovery efficiency. Therefore, polymer oil recovery is needed to improve oil recovery efficiency. The most common oil recovery polymer is polyacrylamide.

[0004] The existing polyacrylamide solution preparation device is configured to prepare the polyacrylamide solution by pouring polyacrylamide powder into clean water and stirring it by a mechanical device.

[0005] However, when a large amount of polyacrylamide solution is prepared, the polyacrylamide powder poured into clean water is prone to agglomeration of the polyacrylamide powder or uneven mixing of the powder and liquid due to untimely or incomplete stirring. Summary of the invention

[0006] In order to reduce the probability of polyacrylamide powder agglomeration or uneven powder-liquid mixing when preparing the polyacrylamide solution, the present application provides a polyacrylamide dry powder mixing device.

[0007] The polyacrylamide dry powder mixing equipment provided in this application adopts the following technical solution: A polyacrylamide dry powder mixing device, comprising: The powder storage device comprises a powder storage tank, wherein the powder storage tank is provided with a powder inlet and a powder outlet, and the powder outlet is connected to a powder outlet pipe; A liquid dispensing device is connected to a liquid infusion pipeline, one end of the liquid infusion pipeline is connected to an infusion pump, the other end of the liquid infusion pipeline is connected to a liquid dispensing elbow, the liquid dispensing elbow comprises a first pipe section and a second pipe section, the openings of the first pipe section and the second pipe section are arranged in a cross direction, the first pipe section is connected to the liquid infusion pipeline, the powder outlet pipe is connected to the second pipe section in an inclined direction from the direction of the first pipe section to the direction of the second pipe section, the second pipe section is connected to a venturi tube, and the pipe radial direction of the venturi tube gradually increases in a direction away from the liquid dispensing elbow; A mixing device is connected to the end of the venturi tube away from the liquid dispensing elbow, and the mixing device is used to keep the solution mixed after the liquid dispensing is completed.

[0008] By adopting the above technical scheme, when the polyacrylamide solution is prepared, the clean water is driven to flow in the liquid distribution elbow by the infusion pump. The clean water in the liquid distribution elbow flows from the direction of the first pipe section to the direction of the second pipe section due to the effect of the wall of the liquid distribution elbow, and finally flows into the inside of the Venturi tube. Since the pipe diameter of the Venturi tube gradually increases away from the direction of the liquid distribution elbow, a negative pressure is generated in the liquid distribution elbow, and then the polyacrylamide powder in the powder outlet pipe obliquely connected to the second pipe section is sucked into the liquid distribution pipeline. And the polyacrylamide and clean water entering the liquid distribution pipeline generate turbulence due to the change of flow path when continuing to flow through the Venturi tube, so that the polyacrylamide powder and clean water are fully mixed. The powder outlet pipe obliquely connected to the liquid distribution pipeline reduces the probability of clean water entering the powder outlet pipe, thereby reducing the probability of polyacrylamide powder agglomerating due to contact with clean water in the powder outlet pipe, and finally reducing the probability of polyacrylamide powder agglomeration or uneven powder-liquid mixing when the polyacrylamide solution is prepared.

[0009] Optionally, the mixing device includes a mixing tank and a stirring paddle, wherein the stirring paddle is disposed inside the mixing tank and connected to a driving motor, and a tank wall of the mixing tank is connected to an adding pipe, and the adding pipe is used for adding an additive solution.

[0010] By adopting the above technical solution, the additive solution is added to the polyacrylamide solution in the mixing tank through the adding tube connected to the tank wall of the mixing tank, and the polyacrylamide solution and the additive solution are stirred by the stirring paddle to achieve full mixing of the polyacrylamide solution and keep the solution mixed after the preparation is completed.

[0011] Optionally, the end of the Venturi tube facing away from the second pipe section is connected to a liquid outlet pipe, and the liquid outlet pipe is connected to the upper part of the mixing tank. A barrier disk is provided inside the mixing tank, and the barrier disk is arranged to separate the top inner wall of the mixing tank. The barrier disk is located on the moving path of the liquid flowing out of the liquid outlet pipe.

[0012] By adopting the above technical solution, after the polyacrylamide powder is mixed by the venturi tube, it flows out through the liquid outlet pipe and collides with the barrier disk. The solution after the impact of the barrier disk is dispersed and can be mixed more evenly in the mixing tank, thereby further improving the mixing uniformity of the polyacrylamide solution.

[0013] Optionally, a plurality of parallel arranged liquid-breaking plates are connected to a side of the barrier disk facing the liquid outlet pipe, and the liquid-breaking plates are arranged perpendicular to the surface of the barrier disk.

[0014] By adopting the above technical solution, the polyacrylamide solution flowing out through the liquid outlet pipe hits the barrier disk and is diverted by the liquid breaking plate on the barrier disk, so that the air in the polyacrylamide solution can be separated from the polyacrylamide solution more quickly, reducing the probability of excessive air entering the solution and affecting the liquid level of the solution.

[0015] Optionally, the barrier disk is arranged obliquely along the flow direction of the liquid flowing out of the liquid outlet pipe, and the arrangement direction of the liquid-breaking plate is consistent with the inclination direction of the barrier disk.

[0016] By adopting the above technical solution, the layout direction of the liquid-breaking plates is kept consistent with the inclination direction of the barrier disk, which reduces the time that the liquid stays in the gap between the liquid-breaking plates, thereby improving the working efficiency of the liquid-breaking plates.

[0017] Optionally, the powder storage device also includes a fluidizing pipe, an air compressor and a powder outlet valve. The fluidizing pipe is arranged at the bottom of the powder storage tank. The tube wall of the fluidizing pipe is connected to a support rod. The end of the support rod facing away from the fluidizing pipe is connected to the inner wall of the powder storage tank. A gap is arranged between the outer wall of the fluidizing pipe and the inner wall of the powder storage tank. The air compressor is connected to the bottom end of the powder storage tank and arranged toward the fluidizing pipe. The powder outlet valve is connected to the powder outlet pipe and controls the connection between the powder storage tank and the powder outlet pipe.

[0018] By adopting the above technical solution, after the polyacrylamide powder enters the powder storage device, the air compressor drives the air flow inside the powder storage tank. Since the air compressor is arranged toward the fluidizing pipe, the air flows toward the fluidizing pipe, thereby driving the polyacrylamide powder to flow toward the fluidizing pipe, and then hits the tank wall of the powder storage tank, and flows down along the tank wall to the air outlet of the air compressor, forming a cycle. Finally, a fluidized bed is formed in the powder storage tank, which keeps the polyacrylamide powder in the powder storage tank flowing, and reduces the probability of polyacrylamide powder agglomeration in the powder storage tank.

[0019] Optionally, the number of the powder storage tanks is at least two.

[0020] By adopting the above technical solution, when the polyacrylamide dry powder mixing equipment is working, one powder storage tank can cooperate with the liquid dispensing device to achieve the dispensing of the polyacrylamide solution, and the other powder storage tank can replenish the powder in time. After the polyacrylamide powder in the powder storage tank that is dispensing with the liquid dispensing device is used up, the other powder storage tank is used to dispense the polyacrylamide solution, thereby reducing the probability of polyacrylamide powder flowing out of the powder inlet due to the simultaneous powder filling and liquid dispensing processes in the same powder storage tank, thereby causing material waste.

[0021] Optionally, the bending angle of the liquid distribution elbow is 90 degrees.

[0022] By adopting the above technical solution, the 90-degree bending angle can reduce the adhesion between the liquid in the liquid distribution pipe close to the second pipe section and the pipe wall of the second pipe section due to inertia, thereby reducing the probability of liquid in the liquid distribution pipe entering the powder outlet pipe.

[0023] Optionally, the powder storage tank is connected to a closed partition, and the closed partition is arranged close to the powder inlet, and the closed partition can control the opening and closing of the powder inlet.

[0024] By adopting the above technical solution, the closed partition in the powder storage tank is opened during the powder filling process, so that the polyacrylamide powder from the outside can enter the inside of the powder storage tank. After the powder filling is completed, the closed partition is closed to isolate the outside from the inside of the powder storage tank, thereby reducing the probability of polyacrylamide powder in the powder storage tank falling to the outside and causing material waste, and at the same time reducing the probability of external humid air entering the inside of the powder storage tank and causing polyacrylamide powder to agglomerate.

[0025] Optionally, an air exhaust pipe is connected to the upper portion of the mixing tank.

[0026] By adopting the above technical solution, the air exhaust pipe can exhaust the excess air in the mixing tank, thereby balancing the air pressure inside the mixing tank and facilitating the polyacrylamide solution to enter the mixing tank.

[0027] Compared with the prior art, the present invention has at least one of the following beneficial technical effects: 1. When preparing the polyacrylamide solution, the infusion pump drives the clean water to flow in the liquid distribution elbow and flow into the Venturi tube with a gradually increasing diameter, so that the liquid distribution elbow generates negative pressure at the bend between the first pipe section and the second pipe section, thereby sucking the polyacrylamide powder in the powder outlet pipe into the liquid distribution elbow and mixing it with the clean water. When flowing through the Venturi tube, turbulence is generated due to the change in pipe diameter, so that the polyacrylamide powder and clean water are mixed more evenly. At the same time, the powder outlet pipe connected to the liquid distribution elbow at an angle can reduce the probability of clean water entering the powder outlet pipe, ultimately reducing the probability of polyacrylamide powder agglomeration or uneven mixing of powder and liquid when preparing the polyacrylamide solution; 2. After the polyacrylamide solution flows out of the liquid outlet pipe, the polyacrylamide solution collides with the barrier disk, making the polyacrylamide solution more dispersed, and the dispersed polyacrylamide solution can be better mixed in the mixing tank. And the collision can reduce the air in the polyacrylamide solution, reducing the probability of the polyacrylamide solution level rising too fast due to excessive air content in the polyacrylamide solution; 3. The air compressor pump and fluidizing pipe inside the powder storage device together with the inner wall of the powder storage tank form a fluidized bed, which keeps the polyacrylamide powder inside the powder storage pipe moving, thereby reducing the probability of agglomeration of the polyacrylamide powder inside the powder storage tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0029] Figure 2 It is a schematic diagram of the cross-sectional structure of an embodiment of the present application.

[0030] Figure 3 yes Figure 2 A magnified schematic diagram of the structure of part A.

[0031] Figure 4 It is a schematic diagram of the structure of the barrier disk in the embodiment of the present application.

[0032] In the figure: 1. powder storage device; 11. powder storage tank; 111. powder inlet; 112. powder outlet; 12. powder outlet pipe; 13. fluidizing pipe; 14. air compressor pump; 15. powder outlet valve; 16. support rod; 17. closing partition; 18. powder inlet funnel; 2. liquid distribution device; 21. liquid infusion pipeline; 22. liquid infusion pump; 23. liquid distribution elbow; 231. first pipe section; 232. second pipe section; 24. venturi tube; 25. liquid outlet pipe; 3. mixing device; 31. mixing tank; 32. stirring paddle; 33. adding pipe; 34. barrier plate; 35. liquid breaking plate; 36. air exhaust pipe; 37. connecting support rod. DETAILED DESCRIPTION

[0033] The following is combined with Figure 1-4 This application is described in further detail.

[0034] The present application embodiment discloses a polyacrylamide dry powder mixing device. Figure 1 and Figure 2 A polyacrylamide dry powder mixing device includes a powder storage device 1, a liquid preparation device 2 and a mixing device 3.

[0035] The powder storage device 1 includes a powder storage tank 11, a powder inlet 111 is provided at the top of the powder storage tank 11, a powder outlet 112 is provided at the bottom of the powder storage tank 11, and the powder outlet 112 is threadedly connected to the powder outlet pipe 12. The liquid dispensing device 2 is connected to a liquid infusion pipeline 21, one end of the liquid infusion pipeline 21 is connected to a liquid infusion pump 22, and the other end of the liquid infusion pipeline 21 is connected to a liquid dispensing elbow 23, and the liquid dispensing elbow 23 includes a first pipe section 231 and a second pipe section 232, and the openings of the first pipe section 231 and the second pipe section 232 are arranged in a cross direction, and the preferred crossing angle is 90 degrees. One end of the first pipe section 231 is connected to the liquid delivery pipeline 21, and the other end of the first pipe section 231 is connected to one end of the second pipe section 232. The powder outlet pipe 12 is connected to the second pipe section 232 at an angle from the direction of the first pipe section 231 toward the direction of the second pipe section 232. The other end of the second pipe section 232 is connected to the venturi tube 24, and the tube radial direction of the venturi tube 24 gradually increases in the direction away from the liquid distribution elbow 23. The end of the venturi tube 24 away from the liquid distribution elbow 23 is connected to the mixing device 3.

[0036] When the polyacrylamide solution is configured, the infusion pump 22 is started, and the infusion pump 22 drives the clean water to flow from the direction of the first pipe section 231 to the direction of the second pipe section 232 in the liquid distribution elbow 23, and then flows through the venturi tube 24. As the diameter of the venturi tube 24 gradually increases, negative pressure is generated, so that the polyacrylamide powder in the powder outlet pipe 12 connected to the liquid distribution elbow 23 enters the liquid distribution elbow 23 and mixes with the clean water. Then, the polyacrylamide powder and the clean water enter the venturi tube 24 together, and are fully mixed due to the turbulence formed by the change in the diameter of the venturi tube 24. At the same time, under the combined effect of the inertia of the liquid at the change in the direction of the liquid distribution elbow 23 pipeline, the negative pressure generated by the obliquely arranged powder outlet pipe 12 and the venturi tube 24, the probability of the clean water in the liquid distribution elbow 23 entering the powder outlet pipe 12 is reduced, thereby reducing the probability of powder agglomeration in the powder outlet pipe 12. Finally, the probability of polyacrylamide powder agglomeration or uneven mixing of powder and liquid during the configuration of the polyacrylamide solution is reduced.

[0037] Reference Figure 2 and Figure 3 , the top of the powder storage tank 11 is connected with a powder feeding funnel 18, and the bottom of the powder feeding funnel 18 is a powder feeding port 111. The bottom of the powder feeding funnel 18 is connected with a closed partition 17, and the tank wall of the powder storage tank 11 is provided with a partition chute (not marked in the attached figure), and the closed partition 17 is slidably connected to the groove wall of the partition chute, and one side of the closed partition 17 is connected with a telescopic cylinder (not marked in the attached figure) with the telescopic direction facing the partition chute, and the telescopic cylinder can push the closed partition 17 to cover the powder feeding port 111. The inside of the powder storage tank 11 is provided with a fluidizing pipe 13, and the pipe wall of the fluidizing pipe 13 is fixedly connected with a plurality of support rods 16, and the number of the support rods 16 is preferably 3 or 4. The end of the support rod 16 facing away from the fluidizing pipe 13 is fixedly connected to the inner wall of the powder storage tank 11, so that a gap is set between the fluidizing pipe 13 and the inner wall of the powder storage tank 11. The bottom end of the powder storage tank 11 is connected to an air compressor 14, and the air outlet of the air compressor 14 is arranged toward the fluidizing pipe 13. The powder outlet pipe 12 is connected to a powder outlet valve 15, and the powder outlet valve 15 controls the communication between the powder outlet pipe 12 and the powder storage tank 11.

[0038] After the polyacrylamide dry powder enters the powder storage tank 11, the air compressor 14 starts working, causing the air inside the powder storage tank 11 to move toward the fluidizing tube 13, thereby driving the polyacrylamide dry powder inside the powder storage tank 11 to flow toward the fluidizing tube 13, pass through the fluidizing tube 13 and under the action of the inner wall of the powder storage tank 11, reflux from the gap between the fluidizing tube 13 and the inner wall of the powder storage tank 11, thereby circulating the air and the polyacrylamide dry powder and reducing the probability of agglomeration of the polyacrylamide dry powder.

[0039] Reference Figure 1 and Figure 2, the number of powder storage tanks 11 is at least two, and the number of powder storage tanks 11 is preferably two. The two powder storage tanks 11 enable one powder storage tank 11 to be equipped with polyacrylamide solution, and the other powder storage tank 11 to be filled with polyacrylamide dry powder. After the polyacrylamide dry powder in one powder storage tank 11 is equipped, the connection between the powder storage tank 11 and the liquid dispensing device 2 is blocked and the air compressor 14 is turned off, and the other powder storage tank 11 is connected with the liquid dispensing device 2. There is always one powder storage tank 11 connected to the liquid dispensing device 2, and the powder storage tank 11 that is not connected to the liquid dispensing device 2 can be conveniently filled with polyacrylamide dry powder, avoiding the same powder storage tank 11 from both filling polyacrylamide dry powder and starting the air compressor 14 for liquid dispensing. This reduces the probability of polyacrylamide dry powder falling from the powder inlet 111 to the outside when filling with polyacrylamide dry powder, resulting in material waste.

[0040] Reference Figure 2 The mixing device 3 includes a mixing tank 31 and a stirring paddle 32. The stirring paddle 32 is arranged inside the mixing tank 31. The end of the stirring paddle 32 is connected to a driving motor (not shown in the figure). The upper part of the mixing tank 31 is connected to a liquid outlet pipe 25 connected to the venturi tube 24. The side wall of the mixing tank 31 is connected to an addition pipe 33. The addition pipe 33 is connected to a liquid addition pump (not shown in the figure).

[0041] The stirring paddle 32 in the mixing device 3 can stir the liquid entering the mixing tank 31, so that the liquid entering the mixing tank 31 is stirred evenly and kept in a mixed state. When it is necessary to add an additive solution to the polyacrylamide solution, it can be added through the adding pipe 33, and the power is provided by the liquid adding pump.

[0042] Reference Figure 2 and Figure 4 , a barrier disk 34 is arranged inside the mixing tank 31, and a connecting rod 37 is fixedly connected to the side wall of the barrier disk 34. The end of the connecting rod 37 facing away from the barrier disk 34 is fixedly connected to the inner wall of the mixing tank 31 so that a gap is set between the barrier disk 34 and the inner wall of the mixing tank 31. The disk surface of the barrier disk 34 is arranged toward the discharge end of the liquid outlet pipe 25 and is located on the flow path of the liquid discharged by the liquid outlet pipe 25. The disk surface of the barrier disk 34 is arranged obliquely toward the flow direction of the liquid and is in oblique contact with the flowing liquid. A plurality of liquid-breaking plates 35 are arranged on the disk surface of the barrier disk 34, and the number of the liquid-breaking plates 35 is preferably 4, 5, or 6. The liquid-breaking plates 35 are arranged parallel to each other, and the arrangement direction of the liquid-breaking plates 35 is consistent with the flow direction of the liquid, and the plate surface of the liquid-breaking plates 35 is arranged perpendicular to the disk surface of the barrier disk 34.

[0043] After the polyacrylamide solution flows out of the liquid outlet pipe 25 and hits the surface of the barrier disc 34, the solution hitting the surface of the barrier disc 34 is diverted by the liquid breaking plate 35, so that the polyacrylamide solution is more dispersed, which is convenient for mixing of the polyacrylamide solution. The air contained in the polyacrylamide solution after passing through the liquid breaking plate 35 is also easier to separate from the solution, reducing the probability that the air content in the polyacrylamide solution is too high and affects the liquid level. The obliquely arranged surface of the barrier disc 34 and the liquid breaking plates 35 arranged in the same direction as the liquid flow direction can reduce the residence time of the liquid between the liquid breaking plates 35, thereby reducing the probability that the liquid flowing out of the liquid outlet pipe 25 is blocked by the previously flowing liquid and cannot contact the liquid breaking plates 35, so that the liquid breaking plates 35 cannot play the effect of breaking the liquid.

[0044] Reference Figure 1 and Figure 2 The upper part of the mixing tank 31 is connected to an air exhaust pipe 36 connected to the outside. The air exhaust pipe 36 can exhaust the excess air in the mixing tank 31, thereby balancing the air pressure inside the mixing tank 31 and reducing the influence of the polyacrylamide solution entering the mixing tank 31 due to excessive air pressure inside the mixing tank 31.

[0045] The implementation principle of a polyacrylamide dry powder mixing device in the embodiment of the present application is as follows: when configuring the polyacrylamide solution, the infusion pump 22 is first started, and the infusion pump 22 drives the clean water to flow along the liquid distribution elbow 23 and continue to flow into the venturi tube 24. When the liquid enters the venturi tube 24 with a gradually increasing diameter, negative pressure will be generated, thereby sucking the polyacrylamide dry powder in the powder outlet pipe 12 connected to the liquid distribution elbow 23 into the liquid distribution elbow 23 for mixing. The solution mixed with the polyacrylamide dry powder and the clean water flows into the venturi tube 24, and the liquid flowing into the venturi tube 24 will form turbulence due to the change in the diameter, so that the polyacrylamide dry powder and the clean water are mixed more evenly. And the powder outlet pipe 12 connected to the liquid distribution elbow 23 at an angle can reduce the probability of clean water entering the powder outlet pipe 12, thereby reducing the probability of polyacrylamide dry powder agglomerating in the powder outlet pipe 12. Finally, the probability of polyacrylamide powder agglomeration or uneven mixing of powder and liquid when the polyacrylamide solution is configured is reduced.

[0046] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A polyacrylamide dry powder mixing equipment, It is characterized in that include: A powder storage device (1) comprises a powder storage tank (11), wherein the powder storage tank (11) is provided with a powder inlet (111) and a powder outlet (112), and the powder outlet (112) is connected to a powder outlet pipe (12); A liquid dispensing device (2) is connected to a liquid infusion pipeline (21), one end of the liquid infusion pipeline (21) is connected to a liquid infusion pump (22), the other end of the liquid infusion pipeline (21) is connected to a liquid dispensing elbow (23), the liquid dispensing elbow (23) comprises a first pipe section (231) and a second pipe section (232), the openings of the first pipe section (231) and the second pipe section (232) are arranged in a cross-direction, the first pipe section (231) is connected to the liquid infusion pipeline (21), the powder outlet pipe (12) is connected to the second pipe section (232) in an inclined manner from the direction of the first pipe section (231) to the direction of the second pipe section (232), the second pipe section (232) is connected to a venturi tube (24), the tube radial direction of the venturi tube (24) gradually increases in a direction away from the liquid dispensing elbow (23); A mixing device (3) is connected to an end of the venturi tube (24) away from the liquid dispensing elbow (23), and the mixing device (3) is used to keep the solution mixed after the liquid dispensing is completed.

2. A polyacrylamide dry powder mixing device according to claim 1, Features: The mixing device (3) comprises a mixing tank (31) and a stirring paddle (32), wherein the stirring paddle (32) is arranged inside the mixing tank (31) and is connected to a driving motor, and a tank wall of the mixing tank (31) is connected to an adding pipe (33), wherein the adding pipe (33) is used to add an additive solution.

3. A polyacrylamide dry powder mixing device according to claim 2, Features: One end of the venturi tube (24) facing away from the second pipe section (232) is connected to a liquid outlet pipe (25), the liquid outlet pipe (25) is in communication with the upper part of the mixing tank (31), a baffle plate (34) is provided inside the mixing tank (31), the baffle plate (34) is arranged at a distance from the inner wall of the top end of the mixing tank (31), and the baffle plate (34) is located on the moving path of the liquid flowing out of the liquid outlet pipe (25).

4. A polyacrylamide dry powder mixing device according to claim 3, Features: A plurality of parallel arranged liquid-breaking plates (35) are connected to one side of the barrier plate (34) facing the liquid outlet pipe (25), and the liquid-breaking plates (35) are arranged perpendicular to the surface of the barrier plate (34).

5. A polyacrylamide dry powder mixing device according to claim 4, Features: The blocking disc (34) is arranged obliquely along the flow direction of the liquid flowing out of the liquid outlet pipe (25), and the arrangement direction of the liquid-breaking plate (35) is consistent with the oblique direction of the blocking disc (34).

6. A polyacrylamide dry powder mixing device according to claim 1, Features: The powder storage device (1) further comprises a fluidizing pipe (13), an air pressure pump (14) and a powder outlet valve (15); the fluidizing pipe (13) is arranged at the bottom of the powder storage tank (11); the pipe wall of the fluidizing pipe (13) is connected to a support rod (16); one end of the support rod (16) facing away from the fluidizing pipe (13) is connected to the inner wall of the powder storage tank (11); a gap is arranged between the outer wall of the fluidizing pipe (13) and the inner wall of the powder storage tank (11); the air pressure pump (14) is connected to the bottom end of the powder storage tank (11) and arranged toward the fluidizing pipe (13); and the powder outlet valve (15) is connected to the powder outlet pipe (12) and controls the communication between the powder storage tank (11) and the powder outlet pipe (12).

7. A polyacrylamide dry powder mixing device according to claim 1, Features: The number of the powder storage tanks (11) is at least two.

8. A polyacrylamide dry powder mixing device according to claim 1, Features: The bending angle of the liquid distribution elbow (23) is 90 degrees.

9. A polyacrylamide dry powder mixing device according to claim 1, Features: The powder storage tank (11) is connected to a closed partition (17), the closed partition (17) being arranged close to the powder inlet (111), and the closed partition (17) being capable of controlling the opening and closing of the powder inlet (111).

10. A polyacrylamide dry powder mixing device according to claim 2, Features: An air exhaust pipe (36) is connected to the upper portion of the mixing tank (31).

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