High-efficiency energy-saving centrifugal dehydration device and its application in salt production

Abstract

The present invention belongs to the field of salt production application equipment, and in particular relates to a high-efficiency and energy-saving centrifugal dehydration device and its application in salt production. It comprises a two-stage pusher centrifuge body, the two-stage pusher centrifuge body comprising an inner drum, a baffle arranged in the inner drum, and a feed pipe. The two-stage pusher centrifuge body is also provided with a preliminary centrifuge tube. The present invention improves the structure of the existing feed part and the baffle part, utilizes the setting of the preliminary centrifuge tube, realizes the preliminary separation of water and salt particles, and makes the salt liquid discharged from the preliminary centrifuge tube be discharged in a spiral, thereby eliminating the need for a conical feed hopper and colliding with the center position of the baffle, so that the outlet pipe can pass through the baffle and enter the space between the inner drum and the baffle. In conjunction with the setting of a cleaning nozzle, the space between the inner drum and the baffle is cleaned. At the same time, due to the preliminary separation of the preliminary centrifuge tube, the salt content of the salt liquid directly entering the inner drum is increased, thereby achieving the purpose of energy saving.

Description

Technical Field

[0001] The present invention belongs to the field of salt production application equipment, and in particular relates to a high-efficiency energy-saving centrifugal dehydration device and its application in salt production. Background Art

[0002] Salt is the king of all flavors and an indispensable seasoning in life. In addition to being eaten, it is also widely used in industry. Salt can be divided into sea salt, lake salt, well salt, and mineral salt, depending on the raw material. Deep well salt is sourced from wells less than 500 meters deep. Compared to ordinary table salt, deep well salt is rich in various natural mineral elements, has fewer impurities, and is purer than other sources. The raw material for salt production is brine, which is divided into natural brine and artificial brine. Brine almost always contains impurities and cannot be used directly in salt production. For this reason, the existing deep well salt preparation process can be roughly divided into a brine purification process, deep purification technology, and a dehydration and drying process. The dehydration and drying process mainly uses a centrifuge to remove surface moisture from the salt particles, and then uses a fluidized bed dryer to remove residual moisture to obtain the finished salt.

[0003] To ensure the fluidity of the salt, the centrifuge used in existing salt production processes is typically a two-stage piston pusher centrifuge, a continuously operating filter centrifuge. Operating at high speed, slurry is continuously fed through a feed pipe, flows along the inner wall of a conical feed hopper, collides with a baffle, and then flows to the filter screen in the rotating drum. The filtrate passes through the filter screen and is continuously discharged through the filtrate outlet. The residue accumulated on the inner surface of the filter screen is pushed along the inner wall of the rotating drum by the reciprocating piston pusher.

[0004] However, in actual use, during the reciprocating motion of the inner drum, a small amount of fine salt particles will inevitably enter the space between the inner drum and the baffle as the inner drum reciprocates. Generally, most of the material in this space will be discharged through the drain port on the inner drum under the centrifugal force generated by the operation. However, after long-term operation, some salt particles will slowly accumulate in this area, adhere to the inner wall of the inner drum, and cause friction between the baffle and the inner drum, making the gap between the baffle and the inner drum larger and larger, which in turn leads to more salt particles entering. In order to ensure the uniformity of the feed, the baffle adopts a solid plate structure, and its external flushing water cannot pass through the baffle to reach this area. As a result, the piston pusher centrifuge needs to be disassembled and cleaned on a large scale after a period of use, which is not only time-consuming and labor-intensive, but also seriously affects production. Summary of the Invention

[0005] Aiming at the technical problems existing in the existing piston pusher centrifuge in the salt production process, the present invention proposes a high-efficiency and energy-saving centrifugal dehydration device with reasonable design, simple structure, convenient processing and the ability to effectively avoid granulation in the space between the inner drum and the baffle, and its application in salt production.

[0006] In order to achieve the above-mentioned object, the technical solution adopted by the present invention is as follows: the present invention provides a high-efficiency and energy-saving centrifugal dehydration device, comprising a two-stage pusher centrifuge body, the two-stage pusher centrifuge body comprising an inner drum, a baffle arranged in the inner drum and a feed pipe, a preliminary centrifuge tube is further provided in the two-stage pusher centrifuge body, the preliminary centrifuge tube comprises a circular tube portion and a tapered tube portion arranged at one end of the circular tube portion, the preliminary centrifuge tube is arranged downwardly from the circular tube portion toward the tapered tube portion, the pipe mouth of the tapered tube portion is arranged close to the baffle, the diameter of the tapered tube portion gradually decreases from the circular tube portion toward the baffle, the feed pipe is connected to the circular tube portion at a vertical angle, the feed pipe enables the salt solution to enter the circular tube portion tangentially, the end of the circular tube portion away from the tapered tube portion is connected to a water outlet pipe, the end of the water outlet pipe away from the circular tube portion is bent and passes through the baffle to extend into the space between the inner drum and the baffle, the water outlet pipe extends into the space between the inner drum and the baffle and is connected to a cleaning nozzle at one end.

[0007] Preferably, the baffle is also provided with a material guiding mechanism, which includes a material guiding plate rotatably arranged on the baffle and a material guiding cone arranged on the material guiding plate, and spiral blades are arranged on the side walls of the material guiding cone, and the spiral blades are evenly distributed on the side walls of the material guiding cone. A notch is provided at the pipe mouth of the conical tube part, and the notch allows the salt solution to be sprayed toward the spiral blades. The water outlet pipe passes through the material guiding mechanism, and the material guiding mechanism can be rotatably mounted on the water outlet pipe.

[0008] Preferably, a material guide plate is provided on the top of the material guide cone, and material guide blades are provided on the material guide plate. The material guide blades are arranged at a vertical angle to the material guide plate, and the material guide blades are evenly distributed on the material guide plate.

[0009] Preferably, the guide plate is further provided with a right-angled notch, and the right-angled notch is arranged to fit the side wall of the guide blade.

[0010] Preferably, the material guide plate is further provided with a material leakage port, and the material leakage port is arranged on a side of the material guide blade away from the right-angle notch.

[0011] Preferably, the number of the material guide blades is the same as the number of the spiral blades, a material guide trough is provided below the material leakage port, and the notch of the material guide trough is arranged toward the material guide cone.

[0012] The above-mentioned high-efficiency and energy-saving centrifugal dehydration device is used in the centrifugal dehydration process of salt production.

[0013] Compared with the prior art, the advantages and positive effects of the present invention are:

[0014] 1. The present invention provides a high-efficiency and energy-saving centrifugal dehydration device. By improving the structures of the existing feed part and baffle part and utilizing the provision of a preliminary centrifugal tube, preliminary separation of water and salt particles is achieved, and the salt solution discharged from the preliminary centrifugal tube is spirally discharged, thereby eliminating the need for a conical feed hopper and colliding with the center position of the baffle. The outlet pipe can pass through the baffle and enter the space between the inner drum and the baffle. In conjunction with the provision of a cleaning nozzle, the space between the inner drum and the baffle is cleaned. At the same time, due to the preliminary separation in the preliminary centrifugal tube, the salt content of the salt solution directly entering the inner drum is increased, thereby achieving the purpose of energy saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0016] Figure 1 A schematic structural diagram of the high-efficiency and energy-saving centrifugal dehydration device provided in Example 1;

[0017] Figure 2 A schematic diagram of the structure between the preliminary centrifuge tube and the material guide mechanism provided in Example 1;

[0018] Figure 3 A schematic structural diagram of the material guiding mechanism provided in Example 1;

[0019] Figure 4 A front view of the material guiding mechanism provided in Example 1;

[0020] In the above figures, 1. Double-stage pusher centrifuge body; 11. Inner drum; 12. Baffle; 13. Feed pipe; 2. Preliminary centrifuge tube; 21. Circular tube; 22. Conical tube; 23. Notch; 3. Outlet pipe; 31. Cleaning nozzle; 4. Material guide mechanism; 41. Material guide plate; 42. Rotating tube; 43. Material guide cone; 44. Spiral blade; 45. Material guide plate; 451. Right-angle notch; 452. Leakage port; 46. Material guide blade; 47. Material guide trough. DETAILED DESCRIPTION

[0021] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other.

[0022] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0023] Example 1, as Figures 1 to 4 As shown, this embodiment aims to solve the problem that the space between the inner drum 11 and the baffle 12 is inconvenient to clean. To this end, in order to solve the above technical problems, the high-efficiency and energy-saving centrifugal dehydration device provided in this embodiment includes a two-stage pusher centrifuge body 1. The two-stage pusher centrifuge body 1 includes an inner drum 11, a baffle 12 arranged in the inner drum 11, and a feed pipe 13. The above structure is a common structure of an existing two-stage pusher centrifuge. Therefore, in this embodiment, it is not described in detail.

[0024] Taking into account the prior art, the main reason why the cleaning pipe cannot be directly extended into the space between the inner drum 11 and the baffle 12 is that the nozzle of the feed pipe 13 needs to face the center of the baffle 12, and a conical feed hopper needs to be provided. For this reason, it is only necessary not to use the center of the feed pipe 13 and remove the conical feed hopper. For this reason, in this embodiment, a preliminary centrifuge tube 2 is further provided in the double-stage pusher centrifuge body 1. The preliminary centrifuge tube 2 includes a circular tube portion 21 and a conical tube portion 22 provided at one end of the circular tube portion 21, wherein the length of the conical tube portion 22 is at least the length of the circular tube portion 21. 21 is more than 1.5 times the length, and the preliminary centrifuge tube 2 is tilted downward from the circular tube portion 21 toward the conical tube portion 22, and the mouth of the conical tube portion 22 is arranged close to the baffle 12, that is, the preliminary centrifuge tube 2 is tilted inward and downward from the outside of the two-stage pusher centrifuge body 1. At the same time, the diameter of the conical tube portion 22 gradually decreases from the circular tube portion 21 toward the baffle 12, and the feed pipe 13 is connected to the circular tube portion 21 at a vertical angle. The feed pipe 13 enables the saline solution to enter the circular tube portion 21 tangentially. At the same time, the circular tube portion 21 is connected to the water outlet pipe 3 at one end away from the conical tube portion 22.

[0025] The purpose of setting up the preliminary centrifuge tube 2 is to use the inlet pressure energy and speed to make the water head generate centrifugal force. When the brine enters the preliminary centrifuge tube 2 tangentially at a certain flow rate under the action of the water pump, a vortex is formed along the wall of the preliminary centrifuge tube 2 that spirals downward. Salt particles with larger diameter and density are thrown toward the wall of the preliminary centrifuge tube 2 and slide down along the wall under the push of the downward swirling water flow and the action of gravity. Salt liquid with higher salt content is formed in the tapered tube portion 22 and is continuously spirally discharged from the tube mouth of the tapered tube portion 22. Since it is discharged from the tube mouth of the tapered tube portion 22 in a rotating manner, it does not need to rely on the baffle 12 to be directly sprayed toward the inner drum 11, thereby achieving the purpose of eliminating the conical feed hopper and the center of the baffle 12 can be opened. After the relatively pure water swirls downward to a certain degree, it changes direction under the reverse pressure of the increasingly narrow cone wall, spiraling upward from the cone base to form a secondary vortex, which is then discharged through the outlet pipe 3. The end of the outlet pipe 3, away from the circular tube portion 21, is bent, passes through the baffle 12, and extends into the space between the inner drum 11 and the baffle 12. At the same time, the end of the outlet pipe 3 extending into the space between the inner drum 11 and the baffle 12 is connected to a cleaning nozzle 31. In this way, the preliminarily separated water enters the space between the inner drum 11 and the baffle 12 and is sprayed in all directions by the cleaning nozzle 31, completing the cleaning of the space between the inner drum 11 and the baffle 12. At the same time, the separation effect of the preliminarily centrifugal tube 2 increases the concentration of the brine, thereby increasing the separation capacity and achieving energy conservation.

[0026] In order to make the rotationally ejected brine more fully distributed and thus improve the centrifugal efficiency, in this embodiment, a material guide mechanism 4 is further provided on the baffle 12. The material guide mechanism 4 includes a material guide plate 41 rotatably provided on the baffle 12 and a material guide cone 43 provided on the material guide plate 41. Specifically, a rotating tube 42 is provided at one end of the material guide plate 41 away from the material guide cone 43, and a bearing is provided between the rotating tube 42 and the baffle 12. In this way, the material guide plate 41 can be rotated under the action of a driving force.

[0027] In order to utilize the rotating injected salt water to generate driving force, spiral blades 44 are provided on the sidewalls of the guide cone 43. The spiral blades 44 are evenly distributed on the sidewalls of the guide cone 43. A notch 23 is provided at the mouth of the conical tube portion 22. The notch 23 directs the salt water toward the spiral blades 44. The provision of the notch 23 can make the injection of salt water more aligned with the spiral blades 44. In this way, the spiral blades 44 can be driven to generate rotational force, thereby driving the guide plate 41 to rotate, thereby achieving the purpose of dispersing the salt water. Of course, the water outlet pipe 3 is provided through the guide mechanism 4, and the guide mechanism 4 can be rotatably mounted on the water outlet pipe 3. In other words, a bearing is provided on the guide cone 43.

[0028] To further disperse the brine, a guide plate 45 is provided on top of the guide cone 43. Like the guide plate 41, the guide plate 45 is also disc-shaped. Guide blades 46 are provided on the guide plate 45, which are arranged at a perpendicular angle to the guide plate 45 and are evenly distributed on the guide plate 45. Thus, the notch 23 causes the brine to be sprayed toward the spiral blades 44 and the guide blades 46. Because the spiral blades 44 and the guide blades 46 are at different angles, this not only further disperses the brine but also facilitates the rotation of the entire guide mechanism 4.

[0029] Similarly, to further disperse the brine, a right-angled notch 451 is provided on the guide plate 45. The notch 451 is positioned to align with the sidewalls of the guide blades 46. As the brine is sprayed, some of it enters the gaps between the guide blades 46. The notch 451 then directs this portion of the brine toward the spiral blades 44 and the guide cone 43, allowing the brine to adhere more closely to the bottom of the inner drum 11 and disperse, thereby enhancing the centrifugal effect.

[0030] To further disperse the brine and ensure it adheres to the bottom of the inner drum 11, a material outlet 452 is provided on the guide plate 45. This outlet 452 is located on the side of the guide blades 46 that is away from the right-angled notch 451. The number of guide blades 46 is the same as the number of spiral blades 44. Below the material outlet 452, a guide trough 47 is provided, with its opening facing the guide cone 43. This allows some of the brine to flow along the guide cone 43 toward the guide plate 41, where it is then dispersed from the edge of the guide plate 41, closer to the bottom of the inner drum 11 and ensuring effective separation.

[0031] Through the above-mentioned arrangement, after the brine is initially separated using the preliminary centrifuge tube, a spiral jet of concentrated brine is produced, thereby eliminating the need for a conical feed hopper structure for the entire two-stage pusher centrifuge, thereby satisfying the structural requirement of a central perforated baffle. The separated water is then used to clean the space between the inner drum and the baffle, avoiding the trouble of disassembly and assembly. At the same time, since the concentration of the brine entering the inner drum is higher, its separation efficiency is also better, and the output per unit time is greater, thereby achieving the purpose of energy saving. Combined with the setting of the material guide mechanism, the brine can be evenly dispersed even after the conical feed hopper is removed, thereby ensuring the centrifugal effect.

[0032] The above description is merely a preferred embodiment of the present invention and does not constitute any other form of limitation to the present invention. Any person skilled in the art may utilize the technical contents disclosed above to change or modify them into equivalent embodiments with equivalent changes for application in other fields. However, any simple modification, equivalent change, and modification of the above embodiments made in accordance with the technical essence of the present invention without departing from the technical solution of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A high-efficiency and energy-saving centrifugal dehydration device, comprising a two-stage pusher centrifuge body, wherein the two-stage pusher centrifuge body comprises an inner drum, a baffle disposed in the inner drum, and a feed pipe, characterized in that: The double-stage pusher centrifuge body is also provided with a preliminary centrifuge tube, which comprises a circular tube portion and a tapered tube portion arranged at one end of the circular tube portion, the preliminary centrifuge tube is arranged obliquely downward from the circular tube portion toward the tapered tube portion, the tube mouth of the tapered tube portion is arranged close to the baffle, the diameter of the tapered tube portion gradually decreases from the circular tube portion toward the baffle, the feed pipe is connected to the circular tube portion at a vertical angle, the feed pipe allows the salt solution to enter the circular tube portion tangentially, the end of the circular tube portion away from the tapered tube portion is connected to a water outlet pipe, the end of the water outlet pipe away from the circular tube portion is bent and passes through the baffle to extend into the space between the inner drum and the baffle, the water outlet pipe extends into the space between the inner drum and the baffle and is connected to a cleaning nozzle at one end, a material guide mechanism is also provided on the baffle, and the material guide mechanism includes a rotatable device A material guide disc is placed on the baffle, and a material guide cone is arranged on the material guide disc. Spiral blades are arranged on the side walls of the material guide cone, and the spiral blades are evenly distributed on the side walls of the material guide cone. A notch is provided at the pipe mouth of the tapered tube portion, and the notch allows the salt solution to be sprayed toward the spiral blades. The water outlet pipe passes through the material guide mechanism, and the material guide mechanism can be rotatably mounted on the water outlet pipe. A material guide plate is also provided on the top of the material guide cone, and material guide blades are provided on the material guide plate. The material guide blades are arranged at a vertical angle to the material guide plate, and the material guide blades are evenly distributed on the material guide plate. A right-angle notch is also provided on the material guide plate, and the right-angle notch is fitted on the side wall of the material guide blade. A leakage port is also provided on the material guide plate, and the leakage port is arranged on the side of the material guide blade away from the right-angle notch.

2. The high-efficiency and energy-saving centrifugal dehydration device according to claim 1, characterized in that: The number of the material guide blades is the same as the number of the spiral blades. A material guide trough is provided below the material leakage port, and the notch of the material guide trough is arranged toward the material guide cone.

3. The high-efficiency and energy-saving centrifugal dehydration device according to claim 1 or 2 is used in the centrifugal dehydration process of salt production.

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