Efficient energy-saving centrifugal dewatering device and application thereof in salt production

Abstract

The invention belongs to the field of salt manufacturing application equipment, and particularly relates to an efficient energy-saving centrifugal dewatering device and application thereof in salt manufacturing. Comprising a two-stage material pushing centrifugal machine body, the two-stage material pushing centrifugal machine body comprises an inner rotary drum, a baffle arranged in the inner rotary drum and a feeding pipe, and a preliminary centrifugal pipe is further arranged in the two-stage material pushing centrifugal machine body. Preliminary separation of water and salt particles is achieved, salt liquid discharged from the preliminary centrifugal tube is spirally discharged, a conical feeding hopper is omitted, meanwhile, the salt liquid does not need to collide with the center position of a baffle, a water outlet pipe can penetrate through the baffle to enter the space between the inner rotary drum and the baffle, and through the arrangement of a cleaning spray head, the cleaning efficiency is improved. And meanwhile, due to the primary separation of the primary centrifugal tube, the salt content in the salt liquid directly entering the inner rotary drum is increased, and the purpose of saving energy is further achieved.

Description

Technical Field

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

[0002] Salt is the most delicious flavor and an indispensable seasoning in life. In addition to being used for food, salt is also widely used in industry. Salt can be divided into sea salt, lake salt, well salt, mineral salt, etc. according to different raw materials. The raw materials of deep well salt are collected from deep wells below 500 meters. Compared with 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 making salt is brine, which is divided into natural brine and artificial brine. Brine almost 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 brine purification process, deep purification technology and dehydration and drying process. Among them, the dehydration and drying process mainly uses a centrifuge to remove the surface moisture of the salt particles, and then removes the residual moisture through a fluidized bed dryer to obtain finished salt.

[0003] In order to ensure the fluidity of salt, the centrifuge used in the existing salt production process is generally a two-stage piston pusher centrifuge, which is a continuously operated filtering centrifuge. Under high-speed operation, the slurry is continuously fed in from the feed pipe, flows along the inner wall of the conical feed hopper to the baffle, and then flows to the filter screen of the drum. The filtrate passes through the filter screen and is continuously discharged through the filtrate outlet, and the filter residue accumulated on the inner surface of the filter screen is pushed out along the inner wall of the 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 materials 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 produce friction with the baffle, 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 push centrifuge needs to be disassembled and cleaned on a large scale after being used for a period of time, 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 making process, the present invention proposes a high-efficiency and energy-saving centrifugal dehydration device which has reasonable design, simple structure, convenient processing and can effectively avoid granulation in the space between the inner drum and the baffle, and its application in salt making.

[0006] In order to achieve the above-mentioned purpose, the technical scheme 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 also arranged in the two-stage pusher centrifuge body, the preliminary centrifuge tube comprises a circular tube portion and a conical tube portion arranged at one end of the circular tube portion, the preliminary centrifuge tube is arranged downwardly from the circular tube portion to the conical tube portion, the pipe mouth of the conical tube portion is arranged close to the baffle, the diameter of the conical tube portion gradually decreases from the circular tube portion to the baffle direction, 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 conical tube portion is connected with 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, and the end of the water outlet pipe extending into the space between the inner drum and the baffle is connected with a cleaning nozzle.

[0007] Preferably, a material guiding mechanism is also provided on the baffle plate, and the material guiding mechanism comprises a material guiding plate rotatably provided on the baffle plate and a material guiding cone provided on the material guiding plate, spiral blades are provided 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 portion, and the notch enables 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-angle notch, and the right-angle 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 groove is provided below the material leakage port, and the groove opening of the material guide groove 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 the baffle part, the preliminary separation of water and salt particles is achieved by using the arrangement of a preliminary centrifugal tube, 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, so that the outlet pipe can pass through the baffle and enter the space between the inner drum and the baffle. With the arrangement of a cleaning nozzle, the space between the inner drum and the baffle can be cleaned. At the same time, due to the preliminary separation of 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 briefly introduces 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 creative work.

[0016] Figure 1 A schematic diagram of the structure of a 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 guiding mechanism provided in Example 1;

[0018] Figure 3 A schematic diagram of the structure 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. round 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 purpose, 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 the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[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 of the following disclosure.

[0023] Embodiment 1, as Figure 1~Figure 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] Considering that in 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 mouth 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 the present 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 is more than 1.5 times the length, and the preliminary centrifugal tube 2 is inclined downward from the circular tube 21 to the conical tube 22, and the pipe mouth of the conical tube 22 is arranged close to the baffle 12, that is, the preliminary centrifugal tube 2 is inclined downward from the outside of the two-stage pusher centrifuge body 1, and at the same time, the diameter of the conical tube 22 gradually decreases from the circular tube 21 to the baffle 12, and the feed pipe 13 is connected to the circular tube 21 at a vertical angle. The feed pipe 13 allows the salt solution to enter the circular tube 21 tangentially. At the same time, the end of the circular tube 21 away from the conical tube 22 is connected with a water outlet pipe 3.

[0025] The purpose of setting up the preliminary centrifugal tube 2 is to use the pressure energy and speed of the incoming water to generate centrifugal force by the water head. When the brine enters the preliminary centrifugal tube 2 tangentially at a certain flow rate under the action of the water pump, a vortex is formed along the tube wall of the preliminary centrifugal tube 2, which moves in a spiral downward. Salt particles with larger diameter and density are thrown to the tube wall of the preliminary centrifugal tube 2, and slide down along the tube 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 conical tube part 22 and is continuously spirally discharged from the tube mouth of the conical tube part 22. Since it is rotated and discharged from the tube mouth of the conical tube part 22, it does not need to rely on the baffle 12 to spray directly 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, spirals upward from the bottom of the cone to form a secondary vortex, and is discharged through the outlet pipe 3. The end of the outlet pipe 3 away from the circular tube 21 is bent and passes through the baffle 12 to extend into the space between the inner drum 11 and the baffle 12. At the same time, one 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 preliminary separated water enters the space between the inner drum 11 and the baffle 12, and under the action of the cleaning nozzle 31, it is sprayed around to complete the cleaning of the space between the inner drum 11 and the baffle 12. At the same time, due to the separation effect of the preliminary centrifugal tube 2, the concentration of the brine is increased, and then the separation amount is increased, thereby achieving the purpose of energy saving.

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

[0027] In order to generate driving force by rotating the injected salt water, spiral blades 44 are arranged on the side wall of the guide cone 43. The spiral blades 44 are evenly distributed on the side wall of the guide cone 43. A notch 23 is arranged at the mouth of the conical tube 22. The notch 23 allows the salt solution to be ejected toward the spiral blades 44. 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 a rotating 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 runs through the guide mechanism 4, and the guide mechanism 4 can be rotatably mounted on the water outlet pipe 3. That is, a bearing is arranged on the guide cone 43.

[0028] In order to further disperse the salt water, a guide plate 45 is further provided on the top of the guide truncated cone 43. The guide plate 45 is also provided in a disc shape like the guide plate 41. A guide blade 46 is provided on the guide plate 45. The guide blade 46 is provided at a vertical angle to the guide plate 45, and the guide blade 46 is evenly distributed on the guide plate 45. In this way, the notch 23 allows the salt solution to be sprayed toward the spiral blade 44 and the guide blade 46. Since the angles of the spiral blade 44 and the guide blade 46 are different, the salt solution is not only more dispersed, but also the entire guide mechanism 4 is more convenient to rotate.

[0029] Similarly, in order to further disperse the brine, a right-angled notch 451 is provided on the guide plate 45, and the right-angled notch 451 is arranged to fit the side wall of the guide blade 46. Due to the injection of the brine, a certain amount of brine can enter the gap between the guide blades 46, so that the right-angled notch 451 is used to guide this part of the brine to the spiral blade 44 and the guide cone 43, so that the brine is more closely attached to the bottom of the inner drum 11 and dispersed, thereby improving the centrifugal effect.

[0030] In order to further disperse the salt water and disperse it in close contact with the bottom of the inner drum 11, a material leakage port 452 is also provided on the material guide plate 45, and the material leakage port 452 is provided on the side of the material guide blade 46 away from the right-angle notch 451. At the same time, the number of the material guide blades 46 is the same as the number of the spiral blades 44, and a material guide groove 47 is provided below the material leakage port 452, and the notch of the material guide groove 47 is arranged toward the material guide truncated cone 43. In this way, part of the salt solution can flow along the material guide truncated cone 43 to the material guide plate 41, and then disperse from the edge of the material guide plate 41, so that it is dispersed closer to the bottom of the inner drum 11, ensuring the separation effect.

[0031] Through the above-mentioned setting, after the brine is initially separated by using the preliminary centrifugal tube, a spiral-jetted concentrated brine is generated, so that the entire two-stage pusher centrifuge can omit the conical feed hopper structure, thereby meeting the structural condition of the central perforation of the baffle, and then the separated water is 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 better, and the output per unit time is greater, thereby achieving the purpose of energy saving. Combined with the setting of the guide mechanism, the purpose of the brine being able to be evenly dispersed after losing the conical feed hopper is achieved, thereby ensuring the centrifugal effect.

[0032] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope 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: A preliminary centrifuge tube is also provided in the body of the two-stage pusher centrifuge, and the preliminary centrifuge tube includes a circular tube portion and a conical tube portion arranged at one end of the circular tube portion, the preliminary centrifuge tube is arranged downwardly from the circular tube portion to the conical tube portion, the pipe mouth of the conical tube portion is arranged close to the baffle, and the diameter of the conical tube portion gradually decreases from the circular tube portion to the baffle direction, 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 conical 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, and the end of the water outlet pipe extending into the space between the inner drum and the baffle is connected to a cleaning nozzle.

2. The high-efficiency and energy-saving centrifugal dehydration device according to claim 1 is characterized in that: 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, a spiral blade is arranged on the side wall of the material guiding cone, and the spiral blades are evenly distributed on the side wall of the material guiding cone, a notch is arranged at the pipe mouth of the conical tube part, and the notch allows the salt solution to be sprayed toward the spiral blade, the water outlet pipe runs through the material guiding mechanism, and the material guiding mechanism can be rotatably mounted on the water outlet pipe.

3. The high-efficiency and energy-saving centrifugal dehydration device according to claim 2 is characterized in that: 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.

4. The high-efficiency and energy-saving centrifugal dehydration device according to claim 3 is characterized in that: The guide plate is also provided with a right-angle notch, and the right-angle notch is arranged to fit the side wall of the guide blade.

5. The high-efficiency and energy-saving centrifugal dehydration device according to claim 4 is characterized in that: The material guide plate is also 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.

6. The high-efficiency and energy-saving centrifugal dehydration device according to claim 4 is characterized in that: The number of the material guide blades is the same as the number of the spiral blades, a material guide groove is arranged below the material leakage port, and the groove opening of the material guide groove is arranged toward the material guide cone.

7. The high-efficiency and energy-saving centrifugal dehydration device described in any one of claims 1 to 6 is used in the centrifugal dehydration process of salt production.

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