High-molecular acrylamide dissolving system

Abstract

The invention discloses a high-molecular acrylamide dissolving system which comprises a spiral negative-pressure powder dissolver, an electromagnetic valve, an electromagnetic flowmeter, a liquid storage system, a supercharger and a control system, the spiral negative pressure powder dissolver adopts an included angle type tangential feed port, and adopts a supercharger, an electromagnetic flowmeter and an electromagnetic valve to control flow and pressure; powder is dissolved by the spiral negative-pressure powder dissolver, flows out of a liquid outlet and then enters the liquid storage system; a vertical spiral feeder attached to the side wall of a powder inlet of the spiral negative-pressure powder dissolver is arranged in the powder inlet of the spiral negative-pressure powder dissolver; the liquid inlet is obliquely tangent to the side wall of the spiral negative-pressure powder dissolver downwards; and the lower part of the spiral negative-pressure powder dissolver is communicated with a liquid outlet channel, and a guide vane is arranged in the channel. When the additive is applied to a papermaking system, the solubility of the high-molecular acrylamide regulator can be effectively improved, so that the paper strength is improved, the caking phenomenon is prevented, meanwhile, the dissolving time of the additive can be shortened, and the production efficiency is improved.

Description

Technical Field

[0001] The invention relates to a high-molecular acrylamide dissolving system, belonging to the field of fluid mixing equipment. Background Art

[0002] In the papermaking process, the solubility of high molecular acrylamide compounds has a key influence on the interaction between paper fibers. If the solubility of high molecular acrylamide compounds is insufficient, the polymer will form lumps in the pulp, resulting in the inability of the polymer to fully combine with the fiber, and ultimately reducing the overall strength of the paper. There are many reasons that affect the dissolution effect of existing high molecular acrylamide compounds. Among them, the agglomeration of high molecular acrylamide compounds during the addition of solvents and insufficient stirring during the dissolution process are important reasons for their insufficient solubility and pulp agglomeration. In order to improve the dissolution effect of high molecular acrylamide compounds, on the one hand, the particle size of the compound itself can be reduced to promote its dissolution, and on the other hand, the stirring time can be increased. However, the use of small particle size high molecular acrylamide compounds will greatly increase its reagent cost, and increasing the stirring time will greatly increase the preparation time of high molecular acrylamide compound solutions. In addition, the high molecular acrylamide compound solutions prepared in advance often re-agglomerate due to being placed for too long, and the aggregation factors are extremely difficult to control. Based on the above background, it is necessary to develop a dissolution system that can achieve efficient dissolution of high-molecular-weight acrylamide compounds, so that it can be dissolved and used immediately while meeting the dissolution effect, shorten the dissolution process time, improve production efficiency, and prevent fiber clumping caused by aggregation of high-molecular-weight acrylamide compounds. Summary of the invention

[0003] The purpose of the present invention is to provide a high molecular weight acrylamide dissolution system to solve the above technical problems.

[0004] The technical solution to achieve the purpose of the present invention is: a high molecular weight acrylamide dissolution system, including a spiral negative pressure powder dissolver, a solenoid valve, an electromagnetic flowmeter, a liquid storage system, a booster and a control system;

[0005] The spiral negative pressure powder dissolver is a column structure with a cavity, having a powder inlet arranged at the top, a liquid inlet arranged at the side wall of the dissolver cavity, and a liquid outlet arranged at the bottom;

[0006] The powder enters the spiral negative pressure powder dissolver through the powder inlet, and the liquid enters through the liquid inlet and is measured by the electromagnetic valve and the electromagnetic flowmeter. The liquid pressure is controlled by the booster. The electromagnetic valve, the electromagnetic flowmeter and the booster are all controlled by the control system.

[0007] After the powder is dissolved by the spiral negative pressure powder dissolver, it flows out from the liquid outlet and enters the liquid storage system;

[0008] A vertical screw feeder is provided inside the powder inlet of the spiral negative pressure powder dissolver and is in contact with the side wall of the spiral negative pressure powder dissolver; the liquid inlet is arranged to be obliquely tangent to the side wall of the spiral negative pressure powder dissolver downward; and a guide vane is provided in the liquid channel at the bottom of the spiral negative pressure powder dissolver that is connected to the liquid outlet.

[0009] A high molecular acrylamide dissolving system of the present invention has an accurate electromagnetic flow control system, which can accurately proportion by controlling the spiral mode of a vertical screw feeder and the flow rate of a solution, the liquid inlet of the spiral negative pressure powder dissolver is obliquely tangent to the side wall of the spiral negative pressure powder dissolver downward, and the liquid outlet liquid channel mixing chamber is provided with a guide vane, and the liquid has a horizontal swirl of a traditional spiral negative pressure powder dissolver and a pressure toward the liquid outlet; after the accurate proportion of the solution concentration is completed, the mixed liquid forms a strong vortex effect by using the angle between the liquid inlet and the side wall of the spiral negative pressure powder dissolver during the mixing process, which can accelerate the dissolution and mixing process of the powder and the liquid, significantly improve the mixing efficiency, shorten the dissolution time, and ensure the mixing uniformity at the same time; the liquid after the mixing is further disturbed by the guide vane in the liquid outlet, and can be further mixed; the dissolved liquid after the mixing is temporarily stored in the liquid storage system, and the vortex effect is strong during the dissolution process, and the liquid circulation speed is faster than that of the existing vortex dissolver, which can greatly shorten the dissolution time of the high molecular acrylamide agent, and effectively prevent the aggregation after the dissolution from causing insufficient strength of the paper.

[0010] As a preferred solution of the present application, the liquid inlet on the side wall of the spiral negative pressure powder dissolver is tangent to the side wall, and the angle between the liquid inlet and the horizontal plane is 0 to 45 degrees.

[0011] In actual operation, the size of the cutting angle and the pressure of the supercharger can be adjusted to adjust the size of the vortex and the liquid outlet pressure, thereby effectively controlling the dissolution time and solubility of the high molecular weight acrylamide powder.

[0012] As a preferred solution of the present application, the vertical screw feeder is detachably arranged between the side wall of the powder inlet, and a rubber sealing strip is arranged on the contact surface between the vertical screw feeder and the side wall of the powder inlet.

[0013] The rubber sealing strip can effectively ensure the sealing between the vertical screw feeder and the side wall of the powder inlet, thereby ensuring the negative pressure in the powder channel of the vertical screw feeder, thereby pushing the powder to fall effectively, preventing agglomeration caused by powder accumulation in the vertical screw feeder channel, and then affecting the dissolution effect of high molecular weight acrylamide.

[0014] As a preferred solution of the present application, a transition cone is provided at the connection position between the lower liquid outlet of the spiral negative pressure powder dissolver and the dissolver cavity, and the guide blades are arranged in a staggered manner along the side wall of the liquid outlet.

[0015] The transition cone in the above structure can effectively prevent the liquid flow resistance between the liquid outlet and the dissolver cavity, and the setting of the guide blades can further stir the high molecular acrylamide powder that has been dissolved in the dissolver cavity, thereby promoting its further dissolution.

[0016] As a preferred solution of the present application, a height-adjustable threaded structure is provided between the powder inlet and the dissolver cavity of the spiral negative pressure powder dissolver. When the cutting angle between the wall liquid inlet and the side wall is relatively fixed, the height between the powder inlet and the dissolver cavity is adjusted to adjust the pressure in the cavity and then adjust the powder falling resistance.

[0017] As a preferred solution of the present application, the inner wall of the spiral negative pressure powder dissolver is provided with an anti-corrosion coating to enhance its service life.

[0018] As a preferred embodiment of the present application, the guide blades are arranged in multiple groups, and the same group of guide blades is divided into a first guide blade and a second guide blade. One end of the first guide blade is arranged on the side wall of the liquid channel, and the other end is toward the center of the liquid channel and away from the dissolver cavity. One end of the second guide blade is arranged on the side wall of the liquid channel, and the other end is toward the center of the liquid channel and close to the dissolver cavity. The two adjacent groups of guide blades are staggered, which can effectively prevent liquid reflux. The cross flow channels of the guide blades can effectively improve the convection intensity during the mixing process, thereby further improving the solubility of the powder.

[0019] Further or optionally, the liquid storage system is a liquid delivery pipeline or a liquid storage tank for temporarily storing the dissolved high molecular acrylamide to facilitate adjustment of the production rhythm.

[0020] By adopting the above technical solution, the present invention has the following beneficial effects:

[0021] (1) A high molecular acrylamide dissolving system of the present invention has an accurate electromagnetic flow control system, which can accurately proportion by controlling the spiral mode of the vertical screw feeder and the solution flow rate. The liquid inlet of the spiral negative pressure powder dissolver is downwardly obliquely tangent to the side wall of the spiral negative pressure powder dissolver, and the liquid outlet liquid channel mixing chamber is provided with a guide vane. In addition to the horizontal swirl of the traditional spiral negative pressure powder dissolver, the liquid also has pressure toward the liquid outlet. After the solution concentration is accurately proportioned, the mixed liquid forms a strong vortex effect by utilizing the angle between the liquid inlet and the side wall of the spiral negative pressure powder dissolver during the mixing process, which can accelerate the dissolution and mixing process of the powder and the liquid, significantly improve the mixing efficiency, shorten the dissolution time, and ensure the mixing uniformity at the same time. The liquid after mixing is further disturbed by the guide vane in the liquid outlet, and can be further mixed. The dissolved liquid after mixing is temporarily stored in the liquid storage system, and the vortex effect is strong during the dissolution process. The liquid circulation speed is faster than that of the existing vortex dissolver, which can greatly shorten the dissolution time of the high molecular acrylamide agent, and effectively prevent the aggregation after dissolution from causing insufficient paper strength.

[0022] (2) There is a cut angle between the liquid inlet and the side wall of the present invention, and the size of the cut angle and the pressure of the supercharger can be adjusted to adjust the size of the vortex and the liquid outlet pressure, thereby effectively controlling the dissolution time and solubility of the high molecular weight acrylamide powder.

[0023] (3) The vertical screw feeder of the present invention is detachably provided with a rubber sealing strip on the fitting surface between the vertical screw feeder and the side wall of the powder inlet, so as to ensure the negative pressure in the powder channel of the vertical screw feeder and prevent agglomeration caused by the accumulation of powder in the channel of the vertical screw feeder.

[0024] (4) A transition cone is provided at the connection position between the liquid outlet and the dissolver cavity of the present invention, and the guide vanes are arranged in a staggered manner along the side wall of the liquid outlet, which can effectively prevent the liquid flow resistance between the liquid outlet and the dissolver cavity. The setting of the guide vanes can further stir the high-molecular acrylamide powder that has been dissolved in the dissolver cavity, thereby promoting its further dissolution.

[0025] (5) The spiral negative pressure powder dissolver of the present invention has a height-adjustable thread structure between the powder inlet and the dissolver cavity. When the cutting angle between the wall liquid inlet and the side wall is relatively fixed, the height between the powder inlet and the dissolver cavity is adjusted to adjust the pressure in the cavity and then adjust the powder falling resistance.

[0026] (6) The inner wall of the spiral negative pressure powder dissolver of the present invention is provided with an anti-corrosion coating to enhance its service life.

[0027] (7) The guide blades of the present invention are staggered, which can effectively prevent liquid backflow. The cross flow channels of the guide blades can effectively increase the convection intensity during the mixing process and further improve the solubility of the powder.

[0028] (8) The liquid storage system of the present invention is a liquid delivery pipeline or a liquid storage tank that can temporarily store the dissolved high-molecular acrylamide, making it convenient to adjust the production rhythm. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below according to specific embodiments and in conjunction with the accompanying drawings, wherein

[0030] Figure 1 It is a structural schematic diagram of the present invention.

[0031] Figure 2 It is a schematic diagram of the device connection relationship of the present invention.

[0032] The numbers in the accompanying drawings are: spiral negative pressure powder dissolver 1, powder inlet 11, threaded structure 111, liquid inlet 12, liquid outlet 13, guide blade 131, first guide blade 1311, second guide blade 1312, vertical screw feeder 14, solenoid valve 2, electromagnetic flowmeter 3, liquid storage system 4, supercharger 5, control system 6. DETAILED DESCRIPTION

[0033] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions 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. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. 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.

[0036] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0037] In the description of the embodiments of the present invention, it should be understood that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is conventionally placed when used, or are the orientations or positional relationships conventionally understood by those skilled in the art. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0038] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The present invention is further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the scope of protection of the present invention.

[0039] (Example 1)

[0040] See Figure 1 , a high molecular acrylamide dissolution system, comprising a spiral negative pressure powder dissolver 1, a solenoid valve 2, an electromagnetic flowmeter 3, a liquid storage system 4, a booster 5 and a control system 6;

[0041] The spiral negative pressure powder dissolver 1 is a column structure with a cavity, having a powder inlet 11 arranged at the top, a liquid inlet 12 arranged at the side wall of the dissolver cavity, and a liquid outlet 13 arranged at the bottom;

[0042] The powder enters the spiral negative pressure powder dissolver through the powder inlet 11, and the liquid enters through the liquid inlet 12 and is measured by the electromagnetic valve 2 and the electromagnetic flowmeter 3. The liquid pressure is controlled by the booster 5. The electromagnetic valve 2, the electromagnetic flowmeter 3 and the booster 5 are all controlled by the control system 6;

[0043] After the powder is dissolved in the spiral negative pressure powder dissolver 1, it flows out from the liquid outlet 13 and enters the liquid storage system 4;

[0044] A vertical screw feeder 14 is provided inside the powder inlet 11 of the spiral negative pressure powder dissolver 1 and is in contact with the side wall of the spiral negative pressure powder dissolver 1; the liquid inlet 12 is arranged obliquely tangent to the side wall of the spiral negative pressure powder dissolver 1 downward; and a guide vane 131 is provided in the liquid channel at the lower part of the spiral negative pressure powder dissolver 1 that is connected to the liquid outlet 13.

[0045] When the system is working, the powder is placed from the powder inlet of the spiral negative pressure powder dissolver 1, and then passes through the vertical screw feeder. The vertical screw feeder rotates to scrape the powder into the cavity below. At the same time, the liquid enters the cavity at high speed from the liquid inlet 12. The dissolved liquid forms a fierce vortex in the cavity, and the high molecular acrylamide is dissolved; the dissolved high molecular acrylamide solution flows out from the liquid outlet 13 and enters the liquid storage system.

[0046] In the actual production process, when the liquid inlet 12 and the side wall of the spiral negative pressure powder dissolver are fixed at a downward oblique angle, the pressure of the booster is adjusted, and then the dissolved liquid is sampled in the liquid storage system and applied to the pulp for sample preparation and paper performance testing to obtain the optimal ratio between powder and dissolved liquid and the liquid vortex speed.

[0047] In order to ensure that a vortex can be formed inside the spiral negative pressure powder dissolver 1 and has a downward force facing the liquid outlet 13, the cutting angle between the liquid inlet 12 on the side wall of the spiral negative pressure powder dissolver and the side wall is 0 to 45° in the first quadrant. At the same dissolving liquid addition speed, the smaller the angle, the more intense the vortex, the smaller its downward force, and the smaller the cutting effect of the lower guide blade 131. In this process, there is a balance between angle and speed to achieve the best dissolution effect.

[0048] In order to improve the service life of the spiral negative pressure powder dissolver 1, the inner wall of the spiral negative pressure powder dissolver is provided with an anti-corrosion coating, the vertical screw feeder is detachably arranged between the side wall of the powder inlet 11, and a rubber sealing strip is provided on the contact surface between the vertical screw feeder and the side wall of the powder inlet 11.

[0049] In order to increase the cavity capacity and adjust the negative pressure strength in the cavity, a height-adjustable thread structure 111 is provided between the powder inlet 11 of the spiral negative pressure powder dissolver and the dissolver cavity.

[0050] A transition cone is provided at the connection position between the liquid outlet 13 at the bottom of the spiral negative pressure powder dissolver and the dissolver cavity, and the guide vanes 131 are arranged in a high and low staggered manner along the side wall of the liquid outlet 13. The guide vanes 131 are arranged in multiple groups, and the same group of guide vanes 131 is divided into a first guide vane 1311 and a second guide vane 1312. One end of the first guide vane 1311 is arranged on the side wall of the liquid channel, and the other end faces the center of the liquid channel and is away from the dissolver cavity. One end of the second guide vane 1312 is arranged on the side wall of the liquid channel, and the other end faces the center of the liquid channel and is close to the dissolver cavity. The two adjacent groups of guide vanes 131 are arranged alternately.

[0051] The liquid storage system 4 is a liquid delivery pipeline or a liquid storage tank. When the process is in a stable state and needs to be used directly, the liquid delivery pipeline is used to directly connect to the papermaking process; if there is a buffer or intermediate adjustment process between each process link, a liquid storage tank is used for buffering, and then the liquid is taken out from the liquid storage tank for use.

[0052] When the side wall liquid inlet 12 and the side wall of the spiral negative pressure powder dissolver are at a downward angle of 10°, the column diameter of the spiral negative pressure powder dissolver 1 is 25 mm, the liquid inlet diameter is 34 mm, and water is used as the dissolving liquid. When different liquid speeds are used, the solubility is different, as shown in the following table:

[0053]

[0054] The following conclusions can be drawn from the above table: the inflow velocity and the guide blade angle have an impact on the paper strength. Among them, at the same guide blade angle, the increase in the solution cutting speed can effectively improve the solubility of the agent and increase the paper strength. Increasing the inflow velocity of the dissolved liquid alone will reduce the residence time of the agent in the dissolver cavity, and the time it is affected by the eddy current effect will be shorter, and the dissolution rate will decrease. Considering the agglomeration effect of high molecular acrylamide solution after storage in the liquid storage system, its residence time in the liquid storage system should be minimized during use, and the agent should be supplied by direct supply. The optimal parameters are approximately a solution cutting speed of 18.5L / M, a guide blade angle of 20°, and 4 groups of blades with a spacing of 50mm between each group.

[0055] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A polymer acrylamide dissolution system, characterized in that: It comprises a spiral negative pressure powder dissolver (1), an electromagnetic valve (2), an electromagnetic flowmeter (3), a liquid storage system (4), a pressure booster (5) and a control system (6); The spiral negative pressure powder dissolver (1) is a column structure with a cavity, and comprises a powder inlet (11) arranged at the top, a liquid inlet (12) arranged at the side wall of the dissolver cavity, and a liquid outlet (13) arranged at the bottom; The powder enters the spiral negative pressure powder dissolver through the powder inlet (11), and the liquid enters through the liquid inlet (12) and is measured by the electromagnetic valve (2) and the electromagnetic flowmeter (3), and the liquid pressure is controlled by the booster (5). The electromagnetic valve (2), the electromagnetic flowmeter (3) and the booster (5) are all controlled by the control system (6); After the powder is dissolved in the spiral negative pressure powder dissolver (1), it flows out from the liquid outlet (13) and enters the liquid storage system (4); A vertical screw feeder (14) is provided inside the powder inlet (11) of the spiral negative pressure powder dissolver (1) and is in contact with the side wall of the spiral negative pressure powder dissolver (1); the liquid inlet (12) is arranged to be tangentially arranged downwardly with the side wall of the spiral negative pressure powder dissolver (1); and a guide vane (131) is provided in the liquid passage at the bottom of the spiral negative pressure powder dissolver (1) and connected to the liquid outlet (13).

2. A polymer acrylamide dissolution system according to claim 1, characterized in that: The liquid inlet (12) on the side wall of the spiral negative pressure powder dissolver is tangent to the side wall, and the angle between the liquid inlet (12) and the horizontal plane is 0 to 45 degrees.

3. A polymer acrylamide dissolution system according to claim 1, characterized in that: The vertical screw feeder is detachably arranged between the side wall of the powder inlet (11), and a rubber sealing strip is arranged on the contact surface between the vertical screw feeder and the side wall of the powder inlet (11).

4. A polymer acrylamide dissolution system according to claim 1, characterized in that: A transition cone is provided at the connection position between the liquid outlet (13) at the bottom of the spiral negative pressure powder dissolver and the dissolver cavity, and the guide blades (131) are arranged in a staggered manner along the side wall of the liquid outlet (13).

5. A polymer acrylamide dissolution system according to claim 1, characterized in that: A height-adjustable thread structure (111) is provided between the powder inlet (11) and the dissolver cavity of the spiral negative pressure powder dissolver.

6. A polymer acrylamide dissolution system according to claim 1, characterized in that: The inner wall of the spiral negative pressure powder dissolver is provided with an anti-corrosion coating.

7. A polymer acrylamide dissolution system according to claim 4, characterized in that: The guide blades (131) are arranged in multiple groups, and the same group of guide blades (131) is divided into a first guide blade (1311) and a second guide blade (1312), one end of the first guide blade (1311) is arranged on the side wall of the liquid channel, and the other end is oriented toward the center of the liquid channel and away from the dissolver cavity; one end of the second guide blade (1312) is arranged on the side wall of the liquid channel, and the other end is oriented toward the center of the liquid channel and close to the dissolver cavity, and the two adjacent groups of guide blades (131) are staggered.

8. A polymer acrylamide dissolution system according to claim 1, characterized in that: The liquid storage system (4) is a liquid delivery pipeline or a liquid storage tank.

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