Seminal plasma system

Abstract

The application relates to the technical field of pulp refining system, and particularly relates to a pulp refining system, which comprises a pulp pump, a cavitation device and a variable-diameter pipeline. The pulp pump is used for pumping pulp. The inlet pipe of the cavitation device is connected with the outlet pipe of the pulp pump. The pulp pump pumps pulp, the pulp enters the variable-diameter pipeline after a large number of cavities are generated in the cavitation device, the cavities collapse in the flow process of the pulp, the kinetic energy and thermal energy generated by the cavities are used for beating the fiber bundles in the pulp, the fiber bundles in the pulp are fully dissociated, and the fibers in the pulp are fanned out. In the refining process, the fiber bundles in the pulp are not milled and sheared, and thus the fiber length in the pulp can be effectively guaranteed within the expected requirement range. In this way, the beating effect of the pulp is improved, so that the length, flexibility, strength, elasticity and plasticity of the fibers in the pulp meet the expected requirements, and thus the pulp meets the production requirements of papermaking, so that the produced paper can meet the expected quality requirements.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pulp refining system, and particularly relates to a pulp refining system. BACKGROUND

[0002] With the rapid development of China's economy, the consumption of paper is increasing, and a large amount of pulp is needed to meet the demand of papermaking.

[0003] The indicators such as the porosity of paper, the surface porosity of paper, the structural strength of paper, and the toughness of paper are closely related to the length, flexibility, strength, elasticity and plasticity of the fibers in the pulp. If the fibers in the pulp lack the necessary flexibility, and the binding force between the fibers is not ideal, the paper will be porous, rough on the surface, low in strength, and difficult to meet the requirements of use.

[0004] In order to make the pulp fibers form the required paper and paperboard, it is necessary to perform necessary finishing-mechanical treatment on the fibers, commonly known as "beating" or "refining". The beating equipment requires good beating action state to ensure that the length, flexibility, strength, elasticity and plasticity of the fibers in the pulp meet the expected requirements. More importantly, the fibers swell when beating, so as to have high elasticity and plasticity, meet the requirements of paper machine production, and make the produced paper reach the expected quality indicators.

[0005] In China, the coniferous wood fiber is less, and most of it is imported. At present, China mainly develops fast-growing materials, supplemented by bamboo and straw and other grass raw materials. The fibers of these raw materials are relatively short, which requires that such fibers not be cut during the beating process. The existing beating equipment uses the mechanical action method of grinding teeth to treat the fibers in the pulp, so as to loosen, moderately cut and separate the fibers. The shearing action between the blades or grinding teeth of the beating equipment will cut the fibers, and the beating effect is difficult to meet the expected requirements.

[0006] Therefore, how to improve the beating effect of the pulp, so that the length, flexibility, strength, elasticity and plasticity of the fibers in the pulp meet the expected requirements, and then make the pulp meet the production requirements of papermaking, so that the produced paper can reach the expected quality requirements is an urgent technical problem to be solved. SUMMARY

[0007] The pulp refining system provided by the present application aims to solve the technical problem of how to improve the beating effect of the pulp in the prior art, so that the length, flexibility, strength, elasticity and plasticity of the fibers in the pulp meet the expected requirements, and then make the pulp meet the production requirements of papermaking, so that the produced paper can reach the expected quality requirements.

[0008] The pulp refining system provided by the present application comprises:

[0009] A pulp pump for pumping pulp;

[0010] A cavitation device, an inlet pipe of which is connected to an outlet pipe of the pulp pump; and

[0011] A reducer pipe, a large-diameter end of which is connected to an outlet pipe of the cavitation device;

[0012] Wherein, the number of the cavitation devices is equal to or greater than one;

[0013] When the number of the cavitation devices is greater than one, the cavitation devices are connected in series, adjacent cavitation devices are connected by the reducer pipe, and a small-diameter end of the reducer pipe is connected to an inlet pipe of a cavitation device downstream thereof.

[0014] Further, the pulp pump is a double-suction centrifugal pump, and the cavitation device is in the form of a vortex volute.

[0015] Further, the power of the motor of the pulp pump is 315-500 kw, the flow rate of the pulp pump is 475-600 m 3 / h, the head of the pulp pump is 140-150 m, the diameter R1 of the inlet pipe of the pulp pump is 260-320 mm, and the diameter R2 of the outlet pipe of the pulp pump is 180-220 mm.

[0016] Further, the diameter R3 of the cavitation device is 870-1100 mm, the diameter R4 of the inlet pipe of the cavitation device is 180-220 mm, and the diameter R5 of the outlet pipe of the cavitation device is 380-420 mm.

[0017] Further, the diameter R6 of the large-diameter end of the reducer pipe is 380-420 mm, and the diameter R7 of the small-diameter end of the reducer pipe is 180-220 mm.

[0018] Further, the length L of the large-diameter section of the reducer pipe is 3000-5000 mm.

[0019] Further, the inlet pipe of the cavitation device is arranged in a tangential direction of the cavitation device, and the outlet pipe of the cavitation device is arranged in an axial direction of the cavitation device.

[0020] Further, a first control valve is arranged downstream of the reducer pipe connected to the outlet pipe of the last cavitation device.

[0021] Further, a second control valve is arranged upstream of the pulp pump.

[0022] Further, the number of the cavitation devices is 2-5.

[0023] The application achieves the following beneficial effects:

[0024] The application provides a pulp refining system, which comprises a pulp pump, a cavitation device and a variable-diameter pipeline. The pulp pump is used for pumping pulp. The inlet pipe of the cavitation device is connected with the outlet pipe of the pulp pump. The large-diameter end of the variable-diameter pipeline is connected with the outlet pipe of the cavitation device. The number of the cavitation devices is greater than or equal to one. When the number of the cavitation devices is greater than one, the cavitation devices are connected in series, adjacent cavitation devices are connected by the variable-diameter pipeline, and the small-diameter end of the variable-diameter pipeline is connected with the inlet pipe of the downstream cavitation device. In the process of refining the pulp, the pulp pump pumps the pulp, the pulp enters the variable-diameter pipeline after a large number of cavitation bubbles are generated in the cavitation device, the cavitation bubbles collapse in the flow process of the pulp, and the kinetic energy and thermal energy generated by the cavitation bubbles are used to beat the fiber bundles in the pulp, so that the fiber bundles in the pulp are fully dissociated to form dispersed fiber filaments, and the fibers in the pulp are further fanned out. In the refining process, the fiber bundles in the pulp are not ground and sheared, so that the length of the fiber filaments in the pulp can be effectively ensured within the expected range. The liquid cavitation instantaneously causes the special physical phenomenon of molecular bond explosion, so that the liquid changes from a large molecular group to a small molecular group, the contact interface between molecules is increased, the fiber filaments in the pulp are uniformly distributed and are wrapped by small molecular groups of water, the pulp slurry is not easy to precipitate, and the uniformity of the produced paper product is improved. In this way, the beating effect of the pulp is improved, so that the length, flexibility, strength, elasticity and plasticity of the fibers in the pulp meet the expected requirements, and the pulp meets the production requirements of papermaking, so that the produced paper can meet the expected quality requirements. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a principle diagram of the pulp refining system in the embodiment of the application;

[0026] Figure 2 is a side view of the pulp pump motor connected with the pulp pump in the embodiment of the application;

[0027] Figure 3 is a side view of the pulp pump in the embodiment of the application;

[0028] Figure 4 is a sectional view of the cavitation device in the embodiment of the application;

[0029] Figure 5 is a sectional view of the variable-diameter pipeline in the embodiment of the application.

[0030] Explanation of main element symbols:

[0031] 10, white water system; 11, pulp pump; 12, cavitation device; 13, variable diameter pipe; 14, first control valve; 15, second control valve; 16, white water storage tank; 17, pulp storage tank; 18, pulp pump motor. DETAILED DESCRIPTION

[0032] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. The examples of the embodiments are shown in the drawings, wherein identical or similar labels denote identical or similar elements or elements with identical or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application. In addition, it should be understood that the specific embodiments described herein are only used to explain the present application and cannot be used to limit the present application.

[0033] In the description of the present application, it should be understood that the terms "length", "width", "upper", "lower", "left", "right", "horizontal", "top", "bottom", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0034] In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0035] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0036] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "over" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. The first feature "under", "below" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.

[0037] The following disclosure provides many different embodiments, or examples, for implementing different structures of the present application. For the purpose of simplicity, the elements and settings of certain examples in the following description will be described with the same or similar reference numerals. These will, however, be understood as being separate applications unless it is specifically stated otherwise. Furthermore, there are several variations of the application, which have not been mentioned and are within the scope of the application. It is to be understood that the phraseology or terminology employed herein, and not the norms of the natural language with the skills of the ordinary person of the art, can be used by the inventor or the applicant in a broad sense and the application is not to be limited to specific applications unless otherwise explicitly specified and limited. In addition, the present application provides examples of various specific processes and materials, but those skilled in the art can realize the application of other processes and / or the use of other materials.

[0038] Please refer to Figure 1 In some embodiments of the present application, the present application proposes a pulp refining system 10, which comprises a pulp pump 11, a cavitator 12 and a variable diameter pipeline 13.

[0039] The pulp pump 11 is used to pump the pulp. The inlet pipe of the cavitator 12 is connected to the outlet pipe of the pulp pump 11. The large diameter end of the variable diameter pipeline 13 is connected to the outlet pipe of the cavitator 12.

[0040] Wherein, the number of cavitators 12 is greater than or equal to one. When the number of cavitators 12 is greater than one, the cavitators 12 are connected in series, adjacent cavitators 12 are connected by the variable diameter pipeline 13, and the small diameter end of the variable diameter pipeline 13 is connected to the inlet pipe of the downstream cavitator 12.

[0041] In the process of refining the pulp, the pulp pump 11 pumps the pulp, the pulp enters the cavitator 12 to generate a large number of cavitation bubbles, and then enters the variable diameter pipeline 13. The cavitation bubbles collapse during the flow of the pulp, and the kinetic energy and thermal energy generated by the cavitation bubbles are used to beat the fiber bundles in the pulp, so that the fiber bundles in the pulp are fully dissociated to form dispersed fiber filaments, and then the fibers in the pulp are separated into a fan shape. In the refining process, the fiber bundles in the pulp will not be ground and sheared, thereby effectively ensuring that the length of the fiber filaments in the pulp is within the expected range.

[0042] The paper pulp is refined by cavitation, and the special physical phenomenon of instantaneous molecular bond explosion caused by liquid cavitation makes the liquid change from large molecular groups to small molecular groups, increases the contact interface between molecules, makes the fiber filaments in the paper pulp uniformly distributed and wrapped by small molecular groups of water, makes the pulp slurry not easy to precipitate, and further improves the uniformity of the produced paper products.

[0043] In this way, the beating effect of the paper pulp is improved, so that the length, flexibility, strength, elasticity and plasticity of the fibers in the paper pulp meet the expected requirements, and the paper pulp meets the production requirements of papermaking, so that the produced paper can meet the expected quality requirements.

[0044] In some embodiments of the present application, the paper pulp pump 11 is a double-suction centrifugal pump, and the cavitation device 12 is in the form of a vortex volute.

[0045] The double-suction centrifugal pump has large flow rate, high head, and is easy to maintain. It pumps the paper pulp by centrifugal action, which can effectively increase the kinetic energy of the pulp slurry in the paper pulp during flow. The centrifugal pump produces a certain cavitation effect during operation, which can preliminarily cavitate and disintegrate the paper pulp. The double-suction centrifugal pump is not only the power source for conveying the paper pulp, but also the power source for the cavitation system, which can save a lot of energy and reduce production costs.

[0046] The paper pulp is pumped by the paper pulp pump 11 in the form of a double-suction centrifugal pump, enters the vortex volute cavitation device 12 through the pipeline, the throttling area of the paper pulp changes, the local pressure is reduced, cavitation is generated, a large number of cavitation bubbles are generated, and then enter the variable-diameter pipeline 13, the cavitation bubbles collapse to form a powerful shock wave, releasing a huge amount of energy. The high energy contained in these high temperature and high pressure can disintegrate the pulp slurry in the paper pulp, fully dissociate the fiber bundles in the paper pulp, form dispersed fiber filaments, and further make the fiber bundles into a feather, so that the refined pulp achieves the expected effect.

[0047] The paper pulp is pumped by the paper pulp pump 11 in the form of a double-suction centrifugal pump, and the paper pulp flows at high speed, and a negative pressure close to vacuum is generated on the surface of the liquid in the paper pulp, so that the boiling point of the liquid is reduced, and then the liquid in the paper pulp is boiled at room temperature to generate a large number of micro-bubbles. When the liquid pressure is lower than the local saturated steam pressure at that time, the bubbles are impacted under the pressure of the surrounding liquid, and the bubbles in the paper pulp burst sharply, and then the bubbles in the paper pulp collapse, so that the liquid and the slurry are rubbed with each other and their respective interiors, forming a strong shock wave and releasing a large amount of energy. The high energy contained in these high temperature and high pressure can be used to disintegrate the slurry in the paper pulp, so that the fiber bundles in the paper pulp are fully dissociated to form dispersed fiber filaments, and then the fiber bundles are separated into a feather duster, so that the refined pulp achieves the expected effect. The bubbles in the slurry develop from birth to collapse, which forms high temperature and high pressure in the paper pulp, and the high energy contained in these high temperature and high pressure can form high-speed micro-jets, and the shear force of the high-speed micro-jets can destroy the cell wall of the microorganism, so that the microorganism is inactivated, and then the purpose of degrading organic pollutants is achieved, and the bacteria in the paper pulp are effectively killed, avoiding the introduction of bactericides, saving production cost, and reducing the influence on subsequent water treatment.

[0048] The instantaneous cavitation of the liquid in the paper pulp causes the molecular bond to burst, so that the liquid changes from a large molecular group to a small molecular group, increasing the contact interface between molecules, which is beneficial to the dispersion, polymerization or decomposition of the solid-liquid mixture. The breaking of the molecular bond makes the molecular bond length of the heterogeneous liquid tend to be the same, thereby promoting the full polymerization of the originally difficult to fuse heterogeneous liquid. At the same time, the active induction of cavitation effect by the vortex volute cavitator 12 can enhance the oxidation process of the liquid, fully play the role of various oxidizing agents, and make the fiber bundles in the liquid fully dissociate. By using the principle of hydrodynamic cavitation, the fast-growing fiber raw material is used for beating, and the fiber is not cut, so as to effectively protect the fiber length, improve the quality of the paper pulp, and the operation is simple.

[0049] It can be understood that the double-suction centrifugal pump has large flow and high head, the paper pulp is pumped by the paper pulp pump 11 in the form of a double-suction centrifugal pump, and the paper pulp flows at high speed when entering the vortex volute cavitator 12. The high-speed flowing paper pulp flows into the small diameter of the cavitator 12, and then flows out from the large diameter of the cavitator 12. The throttling area of the paper pulp increases in the cavitator 12, the local pressure in the paper pulp decreases, and the liquid surface in the paper pulp also generates a negative pressure close to vacuum due to high-speed flow. The pressure of the paper pulp decreases, and then the boiling point of the liquid in the paper pulp decreases, and then the liquid in the paper pulp is boiled at room temperature to generate a large number of micro-bubbles, so as to realize the active induction of cavitation effect by the vortex volute cavitator 12. After a large number of cavities are generated, the throttling area of the paper pulp decreases, the local pressure in the paper pulp increases, the cavities collapse, and then the slurry is high temperature and high pressure and contains high energy.

[0050] Please refer to Figures 2-3 In some embodiments of the present application, the power of the pulp pump motor 18 is 315-500kw, the flow rate of the pulp pump 11 is 475-600m3 / h, the head of the pulp pump 11 is 140-150m, the inlet pipe diameter R1 of the pulp pump 11 is 260-320mm, and the outlet pipe diameter R2 of the pulp pump 11 is 180-220mm.

[0051] The power of the pulp pump motor 18 is configured to be 315-500kw, which can provide sufficient kinetic energy to the pulp during the pumping of the pulp, so that the pulp flows in the pipeline and the homogenizer 12 at the expected flow rate, so that the homogenization effect of the pulp in the homogenizer 12 meets the expected requirements, and thus the refining effect of the pulp meets the expected requirements.

[0052] If the power of the pulp pump motor 18 is too small, it will be difficult for the pulp pump motor 18 to provide sufficient kinetic energy to the pulp when driving the pulp pump 11 to pump the pulp, which on the one hand causes the pulp to lack sufficient power to flow in the refining system 10, and on the other hand causes the flow rate of the pulp to be too small, making it difficult for the pulp to meet the expected homogenization effect. If the power of the pulp pump motor 18 is too large, on the one hand, the refining system 10 has too high a strength requirement for each part (including the pulp pump 11, the homogenizer 12, the variable-diameter pipeline 13, and the connection between each part), which increases the construction cost, and on the other hand, the flow rate of the pulp is too large, which causes the homogenization degree of the pulp to be too strong, increasing the risk of fiber breakage in the pulp or the strength of the fiber in the pulp.

[0053] The flow rate of the pulp pump 11 is configured to be 475-600m3 / h and the head is configured to be 140-150m, which on the one hand can match the pulp pump motor 18, and on the other hand can improve the pumping efficiency of the pulp pump 11 to the pulp and improve the production efficiency of the refining system 10.

[0054] If the flow rate and head of the pulp pump 11 are configured to be too small, on the one hand, the pulp pump 11 is difficult to match the pulp pump motor 18, and on the other hand, the pulp pump 11 is difficult to provide sufficient kinetic energy and flow rate to the pulp in the system, which in turn causes the pulp to lack sufficient power to flow in the refining system 10 and causes the homogenization effect of the pulp to be difficult to meet the expected requirements, thereby making it difficult for the refining effect to meet the expected requirements. If the flow rate and head of the pulp pump 11 are configured to be too large, it will cause the utilization rate of the pulp pump 11 to be reduced under the condition that the power of the pulp pump motor 18 is 315-500kw, and it will increase the risk that the pulp pump motor 18 is difficult to drive the pulp pump 11 to operate normally.

[0055] The inlet pipe diameter R1 of the pulp pump 11 is configured to be 260-320 mm, and the outlet pipe diameter R2 of the pulp pump 11 is configured to be 180-220 mm, which can effectively ensure the flow rate and speed of the pulp in the refined pulp system 10, and further ensure that the pulp conveying efficiency and the refined pulp effect meet the expected requirements. The inlet pipe diameter of the pulp pump 11 is greater than the outlet pipe diameter of the pulp pump 11, which can ensure that the flow rate of the pulp pump 11 is within the expected range, and further improve the conveying efficiency of the pulp.

[0056] Please refer to Figure 4 In some embodiments of the present application, the diameter R3 of the cavitation device 12 is 870-1100 mm, the inlet pipe diameter R4 of the cavitation device 12 is 180-220 mm, and the outlet pipe diameter R5 of the cavitation device 12 is 380-420 mm.

[0057] The inlet of the cavitation device 12 is connected to the outlet of the pulp pump 11 through a pipeline, and the pulp is pumped to the cavitation device 12 during the operation of the pulp pump 11. The inlet pipe of the cavitation device 12 is matched with the outlet pipe of the pulp pump 11, so that the pulp pumped by the pulp pump 11 can smoothly enter the cavitation device 12 from the inlet pipe of the cavitation device 12.

[0058] When the pulp enters the cavitation device 12 through the inlet pipe of the cavitation device 12, since the cavitation device 12 is a vortex scroll cavitation device 12, and the diameter of the cavitation device 12 is much larger than the inlet pipe diameter of the cavitation device 12, when the pulp enters the cavitation device 12, the throttling area of the pulp increases in the cavitation device 12, the local pressure in the pulp decreases, and the liquid surface in the pulp also generates a negative pressure close to vacuum due to high-speed flow. The pressure of the pulp decreases, and further reduces the boiling point of the liquid in the pulp, and further causes the liquid in the pulp to boil at room temperature to generate a large number of micro-bubbles, thereby realizing the active induction of cavitation effect by the vortex scroll cavitation device 12. After a large number of cavitation bubbles are generated in the pulp, the pulp flows out of the cavitation device 12 from the outlet pipe of the cavitation device 12 into the variable-diameter pipeline 13. Since the outlet pipe of the cavitation device 12 is much smaller than the diameter of the cavitation device 12, when the pulp enters the variable-diameter pipeline 13, the throttling area of the pulp decreases, the local pressure in the pulp increases, and the cavitation bubbles collapse, thereby causing the pulp liquid to be high in temperature and pressure and contain high energy, and further causing the pulp to be disintegrated, so that the fiber bundles in the pulp are fully dissociated to form dispersed fiber filaments, and further cause the fiber bundles to be separated into a fiber filaments, thereby achieving the expected effect of refined pulp.

[0059] Please refer to Figure 5 In some embodiments of the present application, the diameter R6 of the large-diameter end of the variable-diameter pipeline 13 is 380-420 mm, and the diameter R7 of the small-diameter end of the variable-diameter pipeline 13 is 180-220 mm.

[0060] The large-diameter end of the variable-diameter pipeline 13 is connected to and matched with the outlet pipe of the upstream cavitation device 12, so that the pulp can smoothly enter the variable-diameter pipeline 13 after being discharged from the cavitation device 12. Since the diameter of the large-diameter end of the variable-diameter pipeline 13 is much smaller than the diameter of the cavitation device 12, the throttling area of the pulp becomes smaller after entering the variable-diameter pipeline 13, the internal pressure of the pulp increases, the bubbles generated in the pulp in the cavitation device 12 collapse, the pulp liquid is high-temperature, high-pressure and contains high energy, the pulp in the pulp is disintegrated, the fiber bundles in the pulp are fully separated to form dispersed fiber filaments, the fiber bundles are separated into a feather duster, and the refined pulp achieves the expected effect.

[0061] The small-diameter end of the variable-diameter pipeline 13 is connected to and matched with the inlet pipe of the downstream cavitation device 12. The diameter of the small-diameter end of the variable-diameter pipeline 13 is smaller than the diameter of the large-diameter end of the variable-diameter pipeline 13. When the pulp enters the small-diameter end of the variable-diameter pipeline 13, the internal pressure of the pulp further increases, the bubbles in the pulp further collapse, the effect of the refined pulp is further improved, and the pulp enters the downstream cavitation device 12 with a large internal pressure, improving the effect of the refined pulp in the downstream cavitation device 12.

[0062] Please refer to Figure 5 In some embodiments of the present application, the length L of the large-diameter section of the variable-diameter pipeline 13 is 3000-5000 mm.

[0063] After the pulp enters the variable-diameter pipeline 13, the throttling area of the pulp becomes smaller, the internal pressure of the pulp increases, the bubbles generated in the pulp in the cavitation device 12 collapse, the pulp liquid is high-temperature, high-pressure and contains high energy, the pulp in the pulp is disintegrated, the fiber bundles in the pulp are fully separated to form dispersed fiber filaments, the fiber bundles are separated into a feather duster, and the refined pulp achieves the expected effect.

[0064] If the length of the variable-diameter pipeline 13 is too small, the bubbles in the pulp will not fully collapse before entering the downstream cavitation device 12 or the pulp tank 17, so that the effect of the refined pulp is difficult to achieve the expected effect. If the length of the variable-diameter pipeline 13 is too long, the bubbles in the pulp will fully collapse, and the pulp will still be transported in the variable-diameter pipeline 13, thereby increasing the invalid transportation distance, affecting the transportation efficiency of the pulp, and further affecting the efficiency of the refined pulp. By limiting the length L of the variable-diameter pipeline 13 to 3000-5000 mm, the transportation efficiency of the pulp can be ensured, the bubbles can be fully collapsed, and the effect of the refined pulp can meet the expected requirements.

[0065] It should be noted that the so-called bubble collapse is sufficient, and it does not necessarily mean that all the bubbles in the pulp are collapsed. The bubble collapse is sufficient means that the number of collapsed bubbles in the pulp does not increase or does not increase significantly with the passage of time during the conveying process. The bubble collapse is sufficient can also include the case that all the bubbles in the pulp are collapsed.

[0066] Please refer to Figure 1 In some embodiments of the present application, the inlet pipe of the cavitator 12 is arranged in the tangential direction of the cavitator 12, and the outlet pipe of the cavitator 12 is arranged in the axial direction of the cavitator 12.

[0067] The pulp enters the cavitator 12 in the tangential direction of the cavitator 12, which can cause the pulp to be guided by the interior of the cavitator 12 to generate a centrifugal effect, thereby increasing the flow rate of the pulp and increasing the number of micro-bubbles generated during the cavitation of the pulp, thereby improving the cavitation effect of the pulp and improving the refining effect of the pulp to meet the expected requirements.

[0068] The pulp enters the cavitator 12 in the tangential direction of the cavitator 12, and the pulp flows out of the cavitator 12 in the axial direction of the cavitator 12, which can cause the pulp to be conveyed in a spiral motion when it flows out of the cavitator 12 and is conveyed in the reducing pipe 13, thereby increasing the disturbance inside the pulp and making the bubbles and slurry more evenly distributed in the pulp, thereby enabling the slurry in the pulp to fully contact the bubbles and fully disintegrate the slurry in the pulp during the collapse of the bubbles, thereby improving the refining effect and meeting the expected requirements.

[0069] Please refer to Figure 1 In some embodiments of the present application, a first control valve 14 is arranged downstream of the reducing pipe 13 connected to the outlet pipe of the last cavitator 12.

[0070] Controlling the opening of the first control valve 14 can control the flow of the pulp, adjust the flow rate of the pulp in the cavitator 12, thereby control the refining degree, and further enable the refining system 10 to meet different degrees of refining requirements.

[0071] In some embodiments of the present application, a second control valve 15 is arranged upstream of the pulp pump 11.

[0072] When the refining system 10 is in an idle state, the second control valve 15 is closed to prevent the pulp from continuing to enter the refining system 10, thereby ensuring the reliability and service life of each part of the refining system 10.

[0073] In some embodiments of the present application, the number of cavitators 12 is 2 to 5.

[0074] The pulp is subjected to multi-stage cavitation in the refining system 10, thereby enabling the refining effect of the pulp to meet the expected requirements.

[0075] Referring to Figure 1 In one application scenario of the present application, the pulp pump 11 is a double-suction centrifugal pump, and the cavitator 12 is a vortex volute cavitator. The pulp pump 11 is provided with a pulp storage tank 16 upstream, and the second control valve 15 is arranged between the inlet pipe of the pulp pump 11 and the pulp storage tank 16. The outlet of the pulp pump 11 is communicated with the inlet of the cavitator 12 through a pipeline, and the number of cavitators 12 is three. The outlet pipe of each cavitator 12 is communicated and installed with a variable-diameter pipeline 13, and all cavitators 12 are arranged in series through the variable-diameter pipeline 13. The upstream first cavitator 12 is connected with the pulp pump 11, and the variable-diameter pipeline 13 connected with the downstream last cavitator 12 is connected with the pulp tank 17 through a pipeline. The variable-diameter pipeline 13 connected with the outlet pipe of the last cavitator 12 is provided with the first control valve 14 between the variable-diameter pipeline 13 and the pulp tank 17.

[0076] When refining, the second control valve 15 is opened, the pulp in the pulp storage tank 16 flows into the pulp pump 11, and then the pulp pump motor 18 is started to drive the pulp pump 11 to operate, so as to pump the pulp through the pulp pump 11 to provide the kinetic energy for the pulp in the pulp refining system 10. During the conveying process of the pulp, the pulp passes through three cavitators 12 in turn for three-stage cavitation to make the pulp refining effect meet the expected requirements. The opening degree of the first control valve 14 can control the flow of the pulp, adjust the flow rate of the pulp in the cavitator 12, and thus control the degree of refining, so that the pulp refining system 10 can meet the different degrees of refining requirements.

[0077] The active induction cavitation effect of the vortex volute cavitator 12 can enhance the oxidation process of the liquid, fully play the role of various oxidizing agents, make the fiber bundles in the liquid fully dissociate, and reduce pollution by introducing surface oxidizing agents.

[0078] The pulp after refining enters the pulp tank 17 for storage and waits for subsequent processing. Through the active induction cavitation effect, the pulp forms high temperature and high pressure, and the high energy contained in the high temperature and high pressure can form high-speed micro-jets. The shear force of the high-speed micro-jets can destroy the cell wall of microorganisms, so as to inactivate the microorganisms, and thus achieve the purpose of degrading organic pollutants, effectively kill bacteria in the pulp, avoid introducing bactericides, save production cost, and reduce the influence on subsequent water treatment.

[0079] The cavitation of the liquid in the pulp instantaneously causes the molecular bond to break, so that the liquid changes from large molecular groups to small molecular groups, increasing the contact interface between molecules, which is conducive to the dispersion, polymerization or decomposition of the solid-liquid mixture. The breaking of the molecular bond causes the molecular bond length of the heterogeneous liquid to approach the same, thereby promoting the full polymerization of the originally difficult to fuse heterogeneous liquid. The uniformity of the pulp and the wrapping of the small molecular water make the pulp less likely to precipitate, reducing the dependence on the headbox of the paper machine, and the uniformity of the paper produced is good.

[0080] The vortex volute cavitation device 12 is connected with the variable-diameter pipeline 13 to generate cavitation, which has a large cavitation area and high efficiency, and is suitable for large batch production. The device has a simple structure, no easy-to-damage parts in the cavitation area, a long service life, simple maintenance, and low maintenance cost.

[0081] Example 1

[0082] The pulp used: poplar chemi-mechanical pulp.

[0083] Beating equipment: the refined pulp system 10 proposed in the application.

[0084] Please refer to Figure 1 , the beating process: the pulp is stored in the pulp storage tank 16, enters the pulp pump 11 through the second control valve 15, enters the cavitation device 11 through the pipeline, generates a large number of cavities, and then enters the variable-diameter pipeline 13, where the cavities collapse. The pulp passes through the three cavitation devices 12 and the three variable-diameter pipelines 13 in turn during transportation, completing three-stage cavitation. Finally, it flows into the pulp tank 17 through the first control valve 14, completing the refining process of the pulp.

[0085] The opening of the first control valve 14 can be controlled to control the flow of the pulp, thereby controlling the degree of beating.

[0086] Detection index: beating degree and wet weight of the pulp.

[0087] Standard implemented: GB / T3332-2004 Pulp Beating Degree Test Method (Schopper-Riegler Method).

[0088] Comparative Example 1

[0089] The pulp used: poplar chemi-mechanical pulp.

[0090] Beating equipment: φ4 50 double-disc mill beating.

[0091] Detection index: beating degree and wet weight of the pulp.

[0092] Standard implemented: GB / T3332-2004 Pulp Beating Degree Test Method (Schopper-Riegler Method).

[0093] The results of the comparative test are shown in Table 1.

[0094] Table I

[0095]

[0096] By detecting the beating degree and the wet weight of the pulp, the change of the pulp in the beating process is mastered, and the beating quality is controlled.

[0097] The beating degree is also called the beating degree (°SR) in the production enterprises. The beating degree is an index reflecting the degree of difficulty of the pulp drainage. Generally, the greater the beating degree, the slower the drainage, and the greater the degree of fiber fanning.

[0098] The wet weight is a rapid method for measuring the fiber length suitable for production. The average length of the fiber is indirectly represented by the wet weight. The wet weight is measured by the frame method, and the beating degree is measured at the same time. The greater the average length of the fiber, the more the fiber hanging on the frame, and the greater the wet weight.

[0099] The experimental results show that the refined pulp system 10 can be used for beating of the pulp. When the beating degree of the pulp is improved, the length of the fiber is basically unchanged. However, when the double-disc refiner is used for beating, the length of the fiber is shorter with the increase of the beating degree.

[0100] In the description of the present specification, the description of the terms "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0101] In addition, the above only describes the preferred embodiments of the present application and does not limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A juice system characterized by, The application relates to a paper pulp pumping system, comprising: a paper pulp pump for pumping paper pulp; a cavitation device, an inlet pipe of the cavitation device being connected to an outlet pipe of the paper pulp pump, a diameter of the cavitation device being larger than a diameter of the inlet pipe of the cavitation device, and an outlet pipe of the cavitation device being smaller than the diameter of the cavitation device; and a variable diameter pipe, a large diameter end of the variable diameter pipe being connected to the outlet pipe of the cavitation device. The number of the cavitation devices is equal to or greater than one. When the number of the cavitation devices is greater than one, the cavitation devices are connected in series, adjacent cavitation devices are connected by the variable diameter pipe, and a small diameter end of the variable diameter pipe is connected to an inlet pipe of a downstream cavitation device. The length of the large diameter section of the variable diameter pipe is 3000-5000 mm. The inlet pipe of the cavitation device is arranged along a tangential direction of the cavitation device, and the outlet pipe of the cavitation device is arranged along an axial direction of the cavitation device. The paper pulp pump is a double-suction centrifugal pump, and the cavitation device is in the form of a vortex type volute.

2. The juice system according to claim 1, characterized in that The diameter R3 of the cavitation device is 870-1100 mm, the diameter R4 of the inlet pipe of the cavitation device is 180-220 mm, and the diameter R5 of the outlet pipe of the cavitation device is 380-420 mm.

3. The juice system according to claim 2, characterized in that The power of the paper pulp pump motor is 315-500kw, the flow of the paper pulp pump is 475-600m 3 / h, the head of the paper pulp pump is 140-150m, the inlet pipe diameter R1 of the paper pulp pump is 260mm-320mm, and the outlet pipe diameter R2 of the paper pulp pump is 180mm-220mm.

4. The juice system according to claim 3, characterized in that The diameter R6 of the large diameter end of the variable diameter pipe is 380-420 mm, and the diameter R7 of the small diameter end of the variable diameter pipe is 180-220 mm.

5. The juice system according to claim 4, characterized in that A first control valve is arranged downstream of the variable diameter pipe connected to the outlet pipe of the last cavitation device.

6. The juice system of claim 1, wherein, A second control valve is arranged upstream of the paper pulp pump.

7. The juice system of claim 1, wherein The number of the cavitation devices is 2-5.

8. The juice system of claim 1, wherein, ​

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