Crystallizing tank for multiple-effect distiller

Abstract

The application discloses a crystallization tank for a multiple-effect distiller, and relates to the technical field of distillers, which comprises a crystallization tank, a communication pipe is arranged on the bottom surface of the crystallization tank, a driving motor is arranged on the top surface of the crystallization tank, a rotating rod is arranged on the output end of the driving motor and penetrates through the top surface of the crystallization tank and is arranged in the up-down direction, the rotating rod is arranged in the communication pipe along the length direction of the communication pipe, and a ball valve is arranged below the communication pipe. The communication pipe arranged on the bottom surface of the crystallization tank is used for slurry conveying, the driving motor arranged on the top surface drives the rotating rod arranged in the communication pipe to rotate, the crystal adhesion in the communication pipe can be broken, the accumulation of the crystal in the communication pipe is reduced, the ball valve below the communication pipe can control the on-off of the slurry conveying, the passage can be cut off for maintenance or treatment when needed, the problem that the outlet pipeline is prone to blockage in the prior art is effectively alleviated, the slurry can smoothly enter the centrifugal machine, and the solid-liquid separation efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of distiller technology, and in particular to a crystallizing tank for a multi-effect distiller. Background Technology

[0002] In many fields of industrial production, such as pharmaceuticals, chemicals, and seawater desalination, multi-effect stills have become key equipment for achieving solution concentration and substance extraction due to their efficient heat energy utilization and excellent separation and purification capabilities. Their core principle is to use the secondary steam generated by the previous evaporator as the heating source for the next evaporator, utilizing heat energy step by step to significantly reduce energy consumption, thus demonstrating a remarkable advantage in processing high-salt, high-concentration solutions.

[0003] In existing multi-effect distillation systems, a crystallizer is typically used as a key pretreatment device for solid-liquid separation to separate and recover solids from the concentrated solution. After the solution reaches a certain concentration through multi-effect distillation, it is introduced into the crystallizer. Under specific temperature and pressure conditions within the tank, the solute gradually precipitates and forms crystals. To further complete solid-liquid separation, the bottom of the crystallizer is directly connected to a centrifuge via a pipe. The slurry containing crystals is then drawn into the centrifuge by gravity or pumping. After centrifugation, solid crystals and mother liquor are obtained. The mother liquor can be returned to the distillation system for reprocessing, forming a complete closed-loop production process. Regarding the aforementioned technologies, the inventors believe that when the solution in the crystallizer is in a supersaturated state, solute crystals tend to adhere to and grow on the tank wall, especially near the outlet pipe. As the operating time increases, these adhered crystals accumulate and gradually reduce the cross-sectional area of ​​the outlet channel, or even cause complete blockage of the outlet. Once the outlet is blocked, the slurry cannot smoothly enter the centrifuge, affecting the solid-liquid separation efficiency. Utility Model Content

[0004] The purpose of this application is to provide a crystallizer for a multi-effect distillation apparatus to improve the problem of easy clogging at the crystallizer outlet.

[0005] This application provides a crystallizing tank for a multi-effect distillation apparatus, employing the following technical solution: A crystallizing tank for a multi-effect distillation apparatus includes a crystallizing tank, a connecting pipe provided on the bottom surface of the crystallizing tank, a drive motor provided on the top surface of the crystallizing tank, the output end of the drive motor passing through the top surface of the crystallizing tank and having a rotating rod provided along the vertical direction, the rotating rod being located inside the connecting pipe and arranged along the length direction of the connecting pipe; a ball valve is provided on the connecting pipe below the rotating rod.

[0006] By adopting the above technical solution, a connecting pipe is set on the bottom surface of the crystallizer for slurry transportation. The drive motor on the top surface drives the rotating rod located inside the connecting pipe to rotate, which can break up the crystals adhering inside the connecting pipe and reduce the accumulation of crystals inside the connecting pipe. The ball valve below the connecting pipe can control the on and off of slurry transportation, which can facilitate the disconnection of the passage for maintenance or treatment when needed. This effectively alleviates the problem of easy blockage of the outlet pipe in the prior art, ensures that the slurry can enter the centrifuge smoothly, and improves the solid-liquid separation efficiency.

[0007] Optionally, a centralized funnel is provided on the bottom surface of the crystallization tank, and the connecting pipe is connected to the centralized funnel.

[0008] By adopting the above technical solution, the concentrated funnel allows the slurry in the tank to be concentrated in the funnel under the action of gravity, reducing the residue of slurry at the bottom of the tank. At the same time, it increases the concentration of slurry entering the connecting pipe, which can reduce the probability of crystals adhering to the bottom edge of the tank, allowing more crystals to enter the connecting pipe directly with the slurry, thereby improving the discharge efficiency of the crystallization tank and indirectly reducing the risk of blockage caused by local sludge accumulation.

[0009] Optionally, the crystallization tank is equipped with a protective sleeve for housing the rotating rod and the output end of the drive motor.

[0010] By adopting the above technical solution, the protective sleeve can protect the rotating rod and the output end of the drive motor, prevent the solution in the crystallizing tank from splashing onto the connection parts of the drive motor or rotating rod, avoid corrosion of these components by the solution, reduce the interference of the external environment on the rotating parts, extend the service life of the equipment, and ensure the stable operation of the drive motor and rotating rod.

[0011] Optionally, the end of the rotating rod away from the drive motor is located inside the connecting pipe and is provided with a conical head.

[0012] By adopting the above technical solution, when the conical head rotates with the rotating rod, it can scrape and disturb the crystals at the bottom of the connecting pipe and near the end of the rotating rod, effectively preventing the crystals from adhering and accumulating at the end of the rotating rod and the bottom of the connecting pipe, which helps the slurry to flow smoothly in the connecting pipe.

[0013] Optionally, the outer wall of the rotating rod is provided with several spiral fan blades.

[0014] By adopting the above technical solution, the spiral fan blades can stir the solution in the crystallization tank when rotating with the rotating rod, making the solute distribution in the solution more uniform and reducing the adhesion of crystals to the tank wall caused by excessively high local concentration. At the same time, the stirring action can also promote the uniformity of solute crystallization and improve the crystallization effect.

[0015] Optionally, the rotating rod includes a first rotating rod connected to a drive motor and a second rotating rod connected to a spiral fan blade. The first rotating rod is provided with a first flange, and the second rotating rod is correspondingly provided with a second flange.

[0016] By adopting the above technical solution, when a part of the spiral fan blade or rotating rod is damaged, the corresponding rotating rod can be disassembled and replaced separately, without having to replace the entire rotating rod, which reduces maintenance costs and difficulty and improves equipment maintenance efficiency.

[0017] Optionally, a sealed bearing fitted to the rotating rod is provided on the inner wall of the end of the protective sleeve away from the drive motor.

[0018] By adopting the above technical solution, the sealed bearing can ensure that the rotating rod rotates smoothly relative to the protective sleeve, and effectively prevent the solution in the crystallizer from leaking through the gap between the rotating rod and the protective sleeve, thus ensuring the sealing of the crystallizer and reducing the risk of external impurities entering the crystallizer and affecting the purity of the solution.

[0019] Optionally, the ball valve is provided with connecting flanges at both ends, and the ball valve is bolted to the connecting pipe through the connecting flanges.

[0020] By adopting the above technical solution, when the ball valve malfunctions or needs cleaning, it can be easily removed from the connecting pipe. The operation is simple and quick, reducing equipment downtime for maintenance and ensuring the continuous and stable operation of the entire system. It also facilitates the replacement of ball valves of different specifications according to actual needs.

[0021] In summary, this application includes at least one of the following beneficial technical effects for crystallizers used in multi-effect distillations: 1. A connecting pipe is installed at the bottom of the crystallizer for slurry transportation. The drive motor on the top drives the rotating rod located inside the connecting pipe to rotate, which can break up the crystals attached inside the connecting pipe and reduce the accumulation of crystals inside the connecting pipe. The ball valve below the connecting pipe can control the on and off of slurry transportation, which can facilitate the disconnection of the passage for maintenance or treatment when needed. This effectively alleviates the problem of easy blockage of the outlet pipe in the existing technology, ensures that the slurry can enter the centrifuge smoothly, and improves the solid-liquid separation efficiency. 2. The concentrated funnel allows the slurry in the tank to be concentrated in the funnel under the action of gravity, reducing the slurry residue at the bottom of the tank. At the same time, it increases the concentration of slurry entering the connecting pipe, which can reduce the probability of crystals adhering to the bottom edge of the tank. This allows more crystals to enter the connecting pipe directly with the slurry, improving the discharge efficiency of the crystallization tank and indirectly reducing the risk of blockage caused by local sludge accumulation. 3. When the spiral fan blades rotate with the rotating rod, they can stir the solution in the crystallization tank, making the solute in the solution more evenly distributed, reducing the adhesion of crystals to the tank wall caused by excessively high local concentrations. At the same time, the stirring action can also promote the uniformity of solute crystallization and improve the crystallization effect. Attached Figure Description

[0022] Figure 1 This is a cross-sectional schematic diagram of the overall structure of the crystallizing tank for a multi-effect distillation apparatus; Figure 2 yes Figure 1 An enlarged schematic diagram of the structure at point A in the middle.

[0023] In the diagram, 1 is the crystallizing tank; 2 is the connecting pipe; 3 is the drive motor; 41 is the rotating rod one; 411 is the flange one; 42 is the rotating rod two; 421 is the flange two; 5 is the ball valve; 51 is the connecting flange; 6 is the central funnel; 7 is the protective sleeve; 71 is the sealed bearing; 8 is the conical head; and 81 is the spiral fan blade. Detailed Implementation

[0024] The following is in conjunction with the appendix Figure 1 -Appendix Figure 2 This application will be described in further detail below.

[0025] A crystallizing tank for a multi-effect distillation apparatus, as described in the following article. Figure 1 , Figure 2 The system includes a crystallization tank 1, a connecting pipe 2 fixedly installed on the bottom surface of the crystallization tank 1 by welding, a centralized funnel 6 integrally formed on the bottom surface of the crystallization tank 1, the centralized funnel 6 is used to collect the slurry in the crystallization tank 1 to the connecting pipe 2, the connecting pipe 2 is connected to the centralized funnel 6, and one end of the connecting pipe 2 is fixedly welded to the outlet end of the centralized funnel 6; a drive motor 3 is fixedly installed on the top surface of the crystallization tank 1 by bolts, the drive motor 3 is a common motor that can provide rotational power, the output end of the drive motor 3 passes through the top surface of the crystallization tank 1 and is connected to a rotating rod in the vertical direction by a coupling, the rotating rod can rotate under the drive of the drive motor 3, the rotating rod is located inside the connecting pipe 2 and is set along the length direction of the connecting pipe 2.

[0026] Reference Figure 1 , Figure 2 The end of the rotating rod away from the drive motor 3 is located inside the connecting pipe 2 and is equipped with a conical head 8 by welding. The conical head 8 can rotate with the rotating rod to prevent crystals from adhering to the end of the rotating rod. Several spiral fan blades 81 are fixedly installed on the outer wall of the rotating rod, outside the connecting pipe 2 and inside the crystallization tank 1 by welding. When the spiral fan blades 81 rotate with the rotating rod, they can stir the solution in the crystallization tank 1. The rotating rod includes a rotating rod 41 connected to the drive motor 3 and a rotating rod 42 connected to the spiral fan blades 81. A flange 411 is fixedly installed at the end of the rotating rod 41, and a flange 421 is fixedly installed at the corresponding end of the rotating rod 42. The rotating rod 41 and the rotating rod 42 are detachably connected by bolts through flanges 411 and 421. Reference Figure 1 , Figure 2A protective sleeve 7 is provided on the top of the crystallization tank 1. The protective sleeve 7 is sleeved on the outside of the rotating rod 41 and the output end of the drive motor 3. One end of the protective sleeve 7 is fixed to the top surface of the crystallization tank 1 by welding. The inner side wall of the end of the protective sleeve 7 away from the drive motor 3 is provided with a sealing bearing 71 that is sleeved on the rotating rod by interference fit. The inner ring of the sealing bearing 71 is fixedly connected to the rotating rod, and the outer ring is fixedly connected to the protective sleeve 7, so that the rotating rod can rotate relative to the protective sleeve 7, and at the same time, it plays a sealing role.

[0027] Reference Figure 1 , Figure 2 The connecting pipe 2 is located below the rotating rod and is bolted to a ball valve 5. The ball valve 5 is a common valve used to control the opening and closing of the pipeline. Both ends of the ball valve 5 are fixed with connecting flanges 51. The ball valve 5 is bolted to the corresponding ends of the connecting pipe 2 through the connecting flanges 51, so as to realize the detachable connection between the ball valve 5 and the connecting pipe 2.

[0028] The implementation principle of this application embodiment is as follows: In actual use, after the multi-effect distillation solution reaches a certain concentration and enters the crystallization tank 1, the drive motor 3 is started. Its output end drives the rotating rod to rotate, and the spiral fan blade 81 rotates accordingly to stir the solution, making the solute evenly distributed to reduce adhesion to the tank wall. At the same time, the conical head 8 of the rotating rod located in the connecting pipe 2 rotates to prevent crystals from adhering and clogging the end of the rotating rod and the inner wall of the connecting pipe 2. Under specific temperature and pressure, the solute precipitates to form a slurry, which is collected in the bottom funnel 6 under gravity and the thrust of the spiral fan blade 81 and flows into the connecting pipe 2. After opening the ball valve 5 connected by bolts at the bottom of the connecting pipe 2, the slurry enters the centrifuge by gravity or pumping to separate the solid crystals and mother liquor. The mother liquor flows back to the distillation system to form a closed loop, while the protective sleeve 7 and the sealing bearing 71 ensure the sealing of the equipment. The embodiments of this specific implementation are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. The same parts are indicated by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A crystallizer for a multiple-effect evaporator comprising a crystallizer (1), characterized in that: The bottom surface of the crystallization tank (1) is provided with a connecting pipe (2), and the top surface of the crystallization tank (1) is provided with a drive motor (3). The output end of the drive motor (3) passes through the top surface of the crystallization tank (1) and is provided with a rotating rod in the up-down direction. The rotating rod is located inside the connecting pipe (2) and is provided along the length of the connecting pipe (2). A ball valve (5) is provided below the rotating rod in the connecting pipe (2).

2. A crystallizing tank for a multi-effect distillation apparatus according to claim 1, characterized in that: The bottom surface of the crystallization tank (1) is provided with a centralized funnel (6), and the connecting pipe (2) is connected to the centralized funnel (6).

3. A crystallizing tank for a multi-effect distillation apparatus according to claim 2, characterized in that: The crystallization tank (1) is equipped with a protective sleeve (7) that covers the rotating rod and the output end of the drive motor (3).

4. A crystallizing tank for a multi-effect distillation apparatus according to claim 3, characterized in that: The end of the rotating rod away from the drive motor (3) is located inside the connecting pipe (2) and is provided with a conical head (8).

5. A crystallizing tank for a multi-effect distillation apparatus according to claim 4, characterized in that: The outer wall of the rotating rod is provided with several spiral fan blades (81).

6. A crystallizing tank for a multi-effect distillation apparatus according to claim 2, characterized in that: The rotating rod includes a first rotating rod (41) connected to the drive motor (3) and a second rotating rod (42) connected to the spiral fan blade (81). The first rotating rod (41) is provided with a first flange (411), and the second rotating rod (42) is provided with a second flange (421).

7. A crystallizing tank for a multi-effect distillation apparatus according to claim 3, characterized in that: The inner wall of the protective sleeve (7) away from the drive motor (3) is provided with a sealed bearing (71) that is sleeved with the rotating rod.

8. A crystallizing tank for a multi-effect distillation apparatus according to claim 1, characterized in that: The ball valve (5) is provided with connecting flanges (51) at both ends, and the ball valve (5) is bolted to the connecting pipe (2) through the connecting flanges (51).

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