Sugar solution energy-saving concentration equipment and method

Abstract

The energy-saving concentration equipment comprises a concentrator provided with a liquid discharging pipe and a steam outlet, a liquid conveying pipe and a steam pipe are vertically arranged in the concentrator, a first rotating connector is arranged at the top of the steam pipe and the top of the liquid conveying pipe, a second rotating connector is arranged at the bottom of the steam pipe, and a plurality of rotating discs are arranged outside the liquid conveying pipe; the rotating disc is of a cavity structure, the steam pipe is sleeved with the rotating disc, the rotating disc is fixedly connected with the steam pipe in a sealed mode, a gas conveying pipe is arranged in the rotating disc, the gas conveying pipe penetrates through the liquid conveying pipe and is communicated with the steam pipe, a liquid discharging opening for discharging liquid to the surface of the rotating disc is formed in the liquid conveying pipe, a motor is arranged on the concentrator, and the motor is used for driving the liquid conveying pipe and the steam pipe to rotate synchronously. Secondary steam generated by evaporation of a large rotating liquid film in the concentrator is recompressed through the steam compressor, one part of the recompressed secondary steam is used for heating feed liquid in the preheater, the other part of the recompressed secondary steam is used for supplementing heat in the concentrator, and compared with a falling film evaporator, energy is saved, and the evaporation effect is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of energy-saving concentration, and particularly to an energy-saving sugar solution concentration device and method. Background Art

[0002] Starch sugars such as allulose need to concentrate the sugar solution before crystallization. Manufacturers generally use a triple-effect evaporation concentration device. This method achieves energy conservation by using the secondary steam generated in the previous effect as the heat source for the subsequent effect. The energy-saving capacity of this kind of device is much lower than that of the mechanical vapor recompression technology (MVR). The mechanical vapor recompression technology (MVR) uses a compressor to heat up and recycle the low-temperature secondary steam, replacing fresh steam, saving 60%-80% more energy than traditional evaporation. The mechanical vapor recompression technology is usually used in conjunction with a rising-film or falling-film evaporator. In a rising-film or falling-film evaporator, the liquid material flows upward or downward in a film shape in multiple heating tubes. Since it increases the evaporation area, the concentration efficiency is further improved.

[0003] Patent CN115382231A discloses a liquid film rotator and a falling-film evaporator. By installing a rotating liquid film generator on the diversion pipe, the liquid material enters the diversion pipe evenly rotating through the liquid flow grooves on the outer wall of the rotating liquid film generator, forming a rotating and stable liquid film in the diversion pipe to improve the evaporation effect. Patent CN109157857A discloses a rotary tube falling-film evaporator. The motor drives the liquid distributor and the falling-film evaporation tubes to rotate, so that the high-viscosity material is evenly distributed on the inner wall of the falling-film tubes, improving the evaporation efficiency. However, both methods do not change the slender structure of the diversion pipe. The liquid material with high viscosity and many foams is prone to blockage problems in the diversion pipe, and subsequent cleaning is also relatively troublesome.

[0004] How to improve the existing concentration equipment to be suitable for concentrating high-viscosity liquid materials, increase the evaporation and concentration area, be easy to clean, be able to operate for a long time, not cause blockage problems, and be energy-saving and efficient is the key concern and the key difficulty in research and development of enterprises. Summary of the Invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide an energy-saving sugar solution concentration device and method to solve the problems of low concentration efficiency, easy blockage and difficult cleaning of pipelines, and high energy consumption in the prior art MVR falling-film evaporator.

[0006] One of the objectives of the present invention is to provide an energy-saving sugar solution concentration device, which includes a concentrator. A liquid delivery pipe and a steam pipe are vertically arranged in the concentrator. The steam pipe is coaxially sleeved inside the liquid delivery pipe. The bottom of the liquid delivery pipe is hermetically connected to the steam pipe. A dual-channel first rotary joint is arranged at the top of the steam pipe. The first rotary joint is respectively rotationally and hermetically connected to the steam pipe and the liquid delivery pipe. A single-channel second rotary joint is arranged at the bottom of the steam pipe. One end of the second rotary joint is rotationally and hermetically connected to the steam pipe, and the other end of the second rotary joint passes through the concentrator. A plurality of rotating disks are arranged outside the liquid delivery pipe. The rotating disks are distributed at intervals up and down. The rotating disks are of a cavity structure. The rotating disks are sleeved outside the steam pipe and are fixedly and hermetically connected to the steam pipe. An air delivery pipe is arranged inside the rotating disks. The air delivery pipe passes through the liquid delivery pipe and is communicated with the steam pipe. A liquid discharge port for discharging liquid to the surface of the rotating disks is arranged on the liquid delivery pipe. A motor is arranged on the concentrator. The motor is used to drive the liquid delivery pipe and the steam pipe to rotate synchronously. A liquid discharge pipe is arranged at the bottom of the concentrator. A steam outlet is arranged at the top of the concentrator.

[0007] Preferably, it further includes a steam compressor and a preheater. The intake end of the steam compressor is respectively communicated with the steam outlet and the second rotary joint. The exhaust end of the steam compressor is respectively communicated with the first rotary joint and the preheater. The sugar solution enters the liquid delivery pipe through the first rotary joint after being heated by the preheater.

[0008] Preferably, a centrifugal impeller is arranged outside the liquid delivery pipe. The centrifugal impeller includes a front cover plate, a rear cover plate and blades sandwiched between the two. The liquid delivery pipe sequentially passes through the rear cover plate and the front cover plate. The liquid delivery pipe is hermetically and fixedly connected to the rear cover plate. A gap is provided between the liquid delivery pipe and the front cover plate. The centrifugal impeller is located between adjacent rotating disks.

[0009] Preferably, a reciprocating mechanism, a plurality of liquid retaining rings and connecting rods are arranged on the concentrator. The outer diameter of the liquid retaining ring is equal to the diameter of the rotating disk. The liquid retaining ring is located between the rotating disk and the centrifugal impeller. The connecting rods are respectively fixedly connected to the liquid retaining rings. The reciprocating mechanism is used to drive the connecting rods and drive the liquid retaining rings to reciprocate up and down.

[0010] Preferably, the reciprocating mechanism includes a fixed ring, a spring, an upper pressing ring, and a lower pressing ring. The fixed ring, the spring, the upper pressing ring, and the lower pressing ring are sleeved outside the infusion tube from top to bottom in sequence. The fixed ring, the upper pressing ring are rotatably connected to the infusion tube, and the lower pressing ring is fixedly connected to the infusion tube. An upper adjusting block is provided on the lower surface of the upper pressing ring, and a lower adjusting block matching the upper adjusting block is provided on the upper surface of the lower pressing ring. The upper end of the connecting rod passes through the concentrator and is fixedly connected to the upper pressing ring, and the connecting rod is slidably and sealingly connected to the concentrator up and down.

[0011] Preferably, the upper adjusting block and the lower adjusting block have the same structure and are both semi-cylindrical structures, and the arc surfaces of the upper adjusting block and the lower adjusting block are arranged opposite to each other.

[0012] Preferably, a fixed sealing ring is provided on the front cover plate. The upper surface of the fixed sealing ring is fixedly and sealingly connected to the front cover plate. A movable sealing ring is fixedly connected to the liquid retaining ring. The outer ring of the movable sealing ring fixedly seals the liquid retaining ring, and the inner ring of the movable sealing ring is slidably and sealingly connected to the fixed sealing ring up and down.

[0013] Preferably, a bevel gear is sleeved outside the infusion tube, and the output end gear of the motor meshes with the bevel gear.

[0014] The second object of the present invention is to provide a method for sugar solution energy-saving concentration equipment, including the following steps:

[0015] S1. A large amount of secondary steam is generated by the film evaporation generated by the rotation of the rotating disk.

[0016] S2. The steam compressor recompresses the secondary steam and then passes it into the inside of the rotating disk to heat the liquid material and discharge the steam.

[0017] S3. The steam discharged from the rotating disk enters the steam compressor for recompression.

[0018] S4. A part of the recompressed hot steam in step S3 is used to pass into the rotating disk, and the other part of the steam passes into the preheater to preheat the liquid material.

[0019] Further, in step S1, the centrifugal impeller in the concentrator rotates to generate negative pressure on the liquid film for vacuum concentration evaporation.

[0020] The present invention has the following advantages:

[0021] 1. The secondary steam generated by the concentrator is compressed by a steam compressor. Part of the compressed steam is introduced into the concentrator to supplement the heat absorbed by evaporation, and the other part is used to heat the feed liquid. This reduces the heat transfer amount in the concentrator, enabling the feed liquid to evaporate at the set optimal temperature immediately after spraying without the need to start evaporation after heat exchange. Compared with existing falling film evaporation equipment, it greatly reduces energy consumption, saves energy, and improves evaporation efficiency.

[0022] 2. The liquid to be concentrated is sprayed on a rotating disk. The centrifugal force generated by the rotating disk makes the feed liquid flow in a liquid film shape on the rotating disk and the inner wall. This not only increases the evaporation area and improves the evaporation effect, but also the large flat liquid film generated by the rotating disk is different from the tubular liquid film generated by existing falling film evaporators, which can avoid the problem of evaporation blockage.

[0023] 3. The setting of the centrifugal impeller can not only accelerate the flow of saturated steam on the liquid film surface and improve the evaporation effect, but also accelerate the flow of cleaning water in the concentrator during the subsequent cleaning process to improve the cleaning effect. Cooperating with the liquid retaining ring and dynamic seal ring that move up and down reciprocally, it can further create a negative pressure state on the liquid film surface, improve the evaporation effect, and at the same time solve the problem that the large flat liquid film hinders the smooth upward flow of steam. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is the overall structural schematic diagram of the present invention;

[0025] Figure 2 is the semi-sectional structural schematic diagram of the concentrator of the present invention;

[0026] Figure 3 is the sectional structural schematic diagram of the concentrator of the present invention in another direction;

[0027] Figure 4 is Figure 3 the structural schematic diagram at position A in

[0028] Figure 5 is the three-dimensional structural schematic diagram of the connection of the centrifugal impeller;

[0029] Figure 6 is the process flow chart.

[0030] In the figure, 1 is a steam compressor; 2 is a preheater; 3 is a concentrator; 4 is a liquid delivery pipe; 5 is a steam pipe; 6 is a first rotary joint; 7 is a second rotary joint; 8 is a liquid discharge pipe; 9 is a steam outlet; 10 is a motor; 11 is a bevel gear; 12 is a rotating disk; 13 is an air delivery pipe; 14 is a centrifugal impeller; 15 is a liquid discharge port; 16 is a liquid retaining ring; 17 is a connecting rod; 18 is a bearing; 19 is a spring; 20 is a fixing ring; 21 is an upper pressing ring; 22 is a lower pressing ring; 23 is an upper adjusting block; 24 is a lower adjusting block; 25 is a fixed sealing ring; 26 is a moving sealing ring; 27 is a rear cover plate; 28 is a blade; 29 is a front cover plate. Detailed implementation mode

[0031] To make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Usually, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0033] A sugar solution energy-saving concentration method depends on the cooperation of a steam compressor 1, a preheater 2, and a concentrator 3 to achieve, as Figure 2 shown, the concentrator 3 is a closed tank structure. A liquid delivery pipe 4 and a steam pipe 5 are vertically installed in the concentrator 3. The lower parts of the liquid delivery pipe 4 and the steam pipe 5 are located in the concentrator 3. The upper parts of the liquid delivery pipe 4 and the steam pipe 5 pass through the concentrator 3 and are rotationally sealed with the concentrator 3. The steam pipe 5 is coaxially sleeved inside the liquid delivery pipe 4. A bevel gear 11 is sleeved outside the liquid delivery pipe 4. The motor 10 is installed on the concentrator 3. The output end gear of the motor 10 meshes with the bevel gear 11. The rotation of the bevel gear 11 drives the liquid delivery pipe 4 and the steam pipe 5 to rotate synchronously.

[0034] At the top of the steam pipe 5, a dual-channel first rotary joint 6 is installed. The first rotary joint 6 is respectively rotationally and sealingly connected to the steam pipe 5 and the infusion pipe 4. High-pressure steam can be input into the steam pipe 5 through one inlet of the first rotary joint 6, and the feed liquid to be concentrated can be input into the infusion pipe 4 through one inlet of the first rotary joint 6. The bottom of the infusion pipe 4 is sealingly connected to the steam pipe 5. At the bottom of the steam pipe 5, a single-channel second rotary joint 7 is installed. One end of the second rotary joint 7 is rotationally and sealingly connected to the steam pipe 5, and the other end of the second rotary joint 7 passes through the concentrator 3. The second rotary joint 7 is used to discharge the steam after heat exchange. The dual-channel first rotary joint 6 and the single-channel second rotary joint 7 are both prior arts and can be purchased commercially.

[0035] A plurality of rotating disks 12 and a plurality of centrifugal impellers 14 are installed outside the infusion pipe 4. Every two of the rotating disks 12 and the centrifugal impellers 14 form a group. The centrifugal impeller 14 is installed above the rotating disk 12, and there is a gap allowing air flow between the two. The rotating disks 12 and the centrifugal impellers 14 are alternately distributed at intervals up and down. The inside of the rotating disk 12 is a cylindrical cavity structure. The rotating disks 12 and the centrifugal impellers 14 are both sleeved outside the steam pipe 5 and are both fixedly and sealingly connected to the steam pipe 5.

[0036] As Figure 5 shown, the centrifugal impeller 14 includes a front cover plate 29, a rear cover plate 27 and blades 28 sandwiched between the two. The infusion pipe 4 passes through the rear cover plate 27 and the front cover plate 29 in sequence. The infusion pipe 4 is fixedly and sealingly connected to the rear cover plate 27. There is a gap between the infusion pipe 4 and the front cover plate 29, and this gap forms a negative pressure inlet after the impeller rotates. The centrifugal impeller 14 is located between adjacent rotating disks 12.

[0037] As Figure 2 shown, two gas transmission pipes 13 are installed in each rotating disk 12. The two gas transmission pipes 13 are arranged in a vertically staggered manner. The gas transmission pipes 13 pass through the infusion pipe 4 and are communicated with the steam pipe 5. The gas transmission pipes 13 are used to transmit the steam between the rotating disk 12 and the steam pipe 5. A plurality of liquid discharge ports 15 for discharging liquid to the surface of the rotating disk 12 are opened on the infusion pipe 4. The liquid discharge ports 15 are evenly arranged at intervals around the infusion pipe 4. The feed liquid discharged from the liquid discharge ports 15 forms a liquid film under the action of centrifugal force after the rotating disk 12 rotates. The liquid film will continue to move and be thrown towards the inner wall of the concentrator 3 and form a liquid film again and flow downward, and finally accumulate at the bottom of the concentrator 3. A liquid discharge pipe 8 is provided at the bottom of the concentrator 3 to discharge the already concentrated feed liquid. A steam outlet 9 is opened at the top of the concentrator 3 to discharge the secondary steam.

[0038] As Figure 1 shown, the intake end of the steam compressor 1 is respectively communicated with the steam outlet 9 and the second rotary joint 7, and the exhaust end of the steam compressor 1 is respectively communicated with the first rotary joint 6 and the preheater 2. The sugar solution is heated by the preheater 2 and then enters the infusion pipe 4 through the first rotary joint 6.

[0039] As shown Figure 3 in the figure, a reciprocating mechanism, a plurality of liquid baffle rings 16, and a connecting rod 17 are installed on the concentrator 3. The outer diameter of the liquid baffle ring 16 is equal to the diameter of the rotating disk 12, and the liquid baffle ring 16 is located directly above the rotating disk 12. The liquid baffle ring 16 is horizontally located between the rotating disk 12 and the centrifugal impeller 14. The lower parts of the connecting rods 17 are fixedly connected to the liquid baffle rings 16 respectively. The reciprocating mechanism is used to drive the connecting rod 17 and drive the liquid baffle ring 16 to reciprocate up and down. When the equipment is running normally, the liquid film thrown towards the inner wall by the rotating disk 12 will hinder the upward movement of the steam below like a partition, which is not conducive to evaporation and concentration. When the connecting rod moves downward until the lower surface of the liquid baffle ring 16 is in close contact with the upper surface of the rotating disk 12, the rotating centrifugal liquid film is blocked by the liquid baffle ring 16 and no longer continues to move towards the concentrator 3, breaking the liquid film that hinders the flow, enabling the steam below to flow upward intermittently and quickly, which is beneficial to reducing the surface pressure of the liquid film and improving the evaporation efficiency.

[0040] The reciprocating mechanism includes a fixed ring 20, a spring 19, an upper pressing ring 21, and a lower pressing ring 22. The fixed ring 20, the spring 19, the upper pressing ring 21, and the lower pressing ring 22 are sleeved on the outer side of the liquid delivery pipe 4 from top to bottom in sequence. The fixed ring 20, the upper pressing ring 21 and the liquid delivery pipe 4 are rotatably connected. A bearing 18 is installed between the fixed ring 20 and the liquid delivery pipe 4. The inner ring of the fixed ring 20 is fixedly connected to the outer ring of the bearing 18. The lower pressing ring 22 is fixedly connected to the liquid delivery pipe 4. An upper adjusting block 23 is installed on the lower surface of the upper pressing ring 21, and a lower adjusting block 24 matching the upper adjusting block 23 is installed on the upper surface of the lower pressing ring 22. The upper end of the connecting rod 17 passes through the concentrator 3 and is fixedly connected to the upper pressing ring 21. The connecting rod 17 and the concentrator 3 are slidably and sealedly connected up and down.

[0041] The upper adjusting block 23 and the lower adjusting block 24 can select a variety of structures, and only need to realize that the lower adjusting block 24 stably jacks up and puts down the upper adjusting block 23 during rotation. Preferably, the upper adjusting block 23 and the lower adjusting block 24 have the same structure and are both semi-cylindrical structures. The arc surfaces of the upper adjusting block 23 and the lower adjusting block 24 are arranged opposite to each other. During the rotation of the lower adjusting block 24 following the lower pressing ring 22, after the arc surface of the lower adjusting block 24 touches the arc surface of the upper adjusting block 23 and continues to move, the lower adjusting block 24 jacks up the upper adjusting block 23 and pushes the upper pressing ring 21 upward. After the upper adjusting block 23 passes over the lower adjusting block 24, the spring 19 rebounds to reset the upper pressing ring 21 downward.

[0042] As shown Figure 4 in Figure 5As shown, a fixed sealing ring 25 is installed on the front cover plate 29. The upper surface of the fixed sealing ring 25 is fixedly and sealingly connected to the front cover plate 29. A moving sealing ring 26 is fixedly connected to the liquid retaining ring 16. The outer ring of the moving sealing ring 26 fixedly seals the liquid retaining ring 16. There is a sliding sealing connection between the inner ring of the moving sealing ring 26 and the fixed sealing ring 25 in the up and down direction. When the liquid retaining ring 16 moves downward until it closely adheres to the rotating disk 12, the upper surfaces of the fixed sealing ring 25, the moving sealing ring 26, the liquid retaining ring 16, and the rotating disk 12 jointly enclose a closed cylindrical cavity structure for containing the liquid material. After the centrifugal impeller 14 rotates, a further negative pressure state is generated, improving the evaporation effect of the liquid material.

[0043] Working principle: The liquid material is heated by the preheater 2 and then discharged into the liquid delivery pipe 4 through the first rotary joint 6. The liquid material in the liquid delivery pipe 4 flows onto the rotating disk 12 through the liquid discharge port 15. The motor 10 is started, and the rotation of the motor 10 synchronously drives the rotation of the liquid delivery pipe 4 and the steam pipe 5. The rotation of the liquid delivery pipe 4 drives the rotation of the rotating disk 12. The rotating disk 12 rotates the liquid material above it centrifugally into a liquid film and moves outward. The liquid film continues to be thrown towards the inner wall of the concentrator 3 and flows downward still in the form of a liquid film until it gathers at the bottom of the concentrator 3. During the whole process, the liquid material flows in the form of a large liquid film, which is beneficial to evaporation and concentration. The secondary steam generated by evaporation is discharged into the steam compressor 1 through the steam outlet 9. The steam compressor 1 compresses and heats the secondary steam and then discharges it into the steam pipe 5 through the first rotary joint 1. The steam is discharged into the rotating disk 12 through the gas delivery pipe 13 to achieve the heating function. The heat-exchanged steam enters the steam compressor 1 again through the second rotary joint 7 to increase the heat content value. A part of the hot steam discharged by the steam compressor 1 is used to connect to the preheater 2 for heating. When only the centrifugal impeller 14 is installed between the rotating disks 12, the centrifugal impeller 14 rotates driven by the liquid delivery pipe 4. A negative pressure is generated in the middle of the rotating centrifugal impeller 14. The saturated steam generated on the surface of the liquid film is sucked into the centrifugal impeller 14 under the action of the negative pressure. The centrifugal impeller 14 can accelerate the flow of the saturated steam on the surface of the liquid film, which is beneficial to improving the evaporation effect. At the same time, when cleaning the concentrator 3, the centrifugal impeller 14 can accelerate the flow of the cleaning water and improve the cleaning effect. When additional structures such as a reciprocating mechanism are installed, the rotation of the liquid delivery pipe 4 drives the rotation of the lower pressing ring 22. The lower pressing ring 22 drives the rotation of the lower adjusting block 24. The lower adjusting block 24 intermittently pushes the upper adjusting block 23 and the upper pressing ring 21 upward. The upper pressing ring 21 drives the connecting rod 17 and the liquid retaining ring 16 to move up and down reciprocally under the action of the spring 19. The liquid retaining ring 16 cooperates with the moving sealing ring 26 and the fixed sealing ring 25 to not only intermittently block the liquid film from flowing towards the inner wall of the concentrator 3, which is beneficial to the smooth upward flow of the saturated steam below, but also enable the liquid material to gather in the closed cavity formed between the rotating disk 12 and the centrifugal impeller 14. The negative pressure generated by the rotation of the centrifugal impeller 14, which is lower than the inside of the concentrator 3, further accelerates the evaporation efficiency.

[0044] The setting of the reciprocating mechanism enables the rotating disk 12 and the centrifugal impeller 14 to control the liquid retaining ring 16 and the dynamic sealing ring 26 to move up and down during the rotation process, which not only realizes the rapid evaporation of the liquid in the form of a liquid film, but also solves the problem of poor steam discharge and has the function of further generating negative pressure to improve the evaporation effect.

[0045] like Figure 6 As shown, a sugar solution energy-saving concentration method, based on the above equipment, includes the following steps:

[0046] S1. The liquid film evaporation generated by the rotation of the rotating disk 12 produces a large amount of secondary steam, and the centrifugal impeller 14 rotates to produce an intermittent negative pressure state of the liquid film for vacuum evaporation and concentration, which also produces a large amount of secondary steam;

[0047] S2. The steam compressor 1 recompresses the secondary steam and passes it into the rotating disk 12 to heat the liquid and discharge the steam;

[0048] S3. The steam discharged from the rotating disk 12 enters the steam compressor 1 for recompression to increase the heat value;

[0049] S4. A part of the hot steam recompressed in step S3 is used to pass into the rotating disk 12 to supplement the heat absorbed by evaporation, and the other part of the steam is passed into the preheater 2 to preheat the feed liquid. The preheater 2 is composed of two heat exchangers connected in series. The preheating can heat the raw material to the temperature required for evaporation. After the feed liquid is discharged onto the rotating disk 12, it can be quickly evaporated by rotation without increasing the temperature again.

[0050] The method only requires that the heated liquid be introduced into the concentrator 3 at startup, and the subsequent heat is provided by the steam compressor 1, which greatly saves energy. The liquid sprayed onto the rotating disk 12 is rotated into a liquid film, and the contact heat transfer time between the steam and the centrifugal liquid film is short. A preheater is used to heat the liquid to the optimal evaporation temperature externally in advance, and there is no need for a large amount of heat transfer in the concentrator, thereby improving the evaporation efficiency.

[0051] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A sugar solution energy-saving concentration device, characterized in that: The invention comprises a concentrator (3), wherein a liquid infusion pipe (4) and a steam pipe (5) are vertically arranged in the concentrator (3), wherein the steam pipe (5) is coaxially sleeved in the liquid infusion pipe (4), wherein the bottom of the liquid infusion pipe (4) is sealedly connected to the steam pipe (5), wherein a double-channel first rotating joint (6) is arranged on the top of the steam pipe (5), wherein the first rotating joint (6) respectively rotates and seals to connect the steam pipe (5) and the liquid infusion pipe (4), wherein a single-channel second rotating joint (7) is arranged on the bottom of the steam pipe (5), wherein one end of the second rotating joint (7) is rotated and sealed to connect the steam pipe (5), and the other end of the second rotating joint (7) passes through the concentrator (3), and a plurality of rotating disks (12) are arranged outside the liquid infusion pipe (4). The rotating disks (12) are arranged at intervals up and down, and the rotating disks (12) are of a hollow structure. The rotating disks (12) are sleeved outside the steam pipe (5) and are fixedly and sealedly connected to the steam pipe (5). An air supply pipe (13) is arranged inside the rotating disk (12), and the air supply pipe (13) passes through the liquid supply pipe (4) and is connected to the steam pipe (5). The liquid supply pipe (4) is provided with a drainage port (15) for discharging liquid to the surface of the rotating disk (12). The concentrator (3) is provided with a motor (10), and the motor (10) is used to drive the liquid supply pipe (4) and the steam pipe (5) to rotate synchronously. A drainage pipe (8) is arranged at the bottom of the concentrator (3), and a steam outlet (9) is arranged at the top of the concentrator (3).

2. The sugar solution energy-saving concentration equipment according to claim 1, characterized in that: It also includes a steam compressor (1) and a preheater (2). The air inlet end of the steam compressor (1) is connected to the steam outlet (9) and the second rotary joint (7), and the air outlet end of the steam compressor (1) is connected to the first rotary joint (6) and the preheater (2). After being heated by the preheater (2), the sugar solution enters the infusion tube (4) through the first rotary joint (6).

3. The sugar solution energy-saving concentration equipment according to claim 1, characterized in that: A centrifugal impeller (14) is arranged outside the infusion tube (4), and the centrifugal impeller (14) comprises a front cover plate (29), a rear cover plate (27) and a blade (28) sandwiched therebetween. The infusion tube (4) passes through the rear cover plate (27) and the front cover plate (29) in sequence. The infusion tube (4) is sealed and fixedly connected to the rear cover plate (27). A gap is provided between the infusion tube (4) and the front cover plate (29). The centrifugal impeller (14) is located between adjacent rotating disks (12).

4. The sugar solution energy-saving concentration equipment according to claim 3, characterized in that: The concentrator (3) is provided with a reciprocating mechanism, a plurality of liquid retaining rings (16), and a connecting rod (17); the outer diameter of the liquid retaining ring (16) is equal to the diameter of the rotating disk (12); the liquid retaining ring (16) is located between the rotating disk (12) and the centrifugal impeller (14); the connecting rod (17) is fixedly connected to the liquid retaining ring (16), respectively; and the reciprocating mechanism is used to drive the connecting rod (17) and drive the liquid retaining ring (16) to reciprocate up and down.

5. The sugar solution energy-saving concentration equipment according to claim 4, characterized in that: The reciprocating mechanism comprises a fixed ring (20), a spring (19), an upper pressure ring (21), and a lower pressure ring (22); the fixed ring (20), the spring (19), the upper pressure ring (21), and the lower pressure ring (22) are sequentially sleeved on the outside of the infusion tube (4) from top to bottom; the fixed ring (20), the upper pressure ring (21) and the infusion tube (4) are rotatably connected; the lower pressure ring (22) and the infusion tube (4) are fixedly connected; an upper adjustment block (23) is arranged on the lower surface of the upper pressure ring (21); a lower adjustment block (24) matching the upper adjustment block (23) is arranged on the upper surface of the lower pressure ring (22); the upper end of the connecting rod (17) passes through the concentrator (3) and is fixedly connected to the upper pressure ring (21); the connecting rod (17) and the concentrator (3) are slidably sealed and connected up and down.

6. The sugar solution energy-saving concentration equipment according to claim 5, characterized in that: The upper adjustment block (23) and the lower adjustment block (24) have the same structure and are both semi-cylindrical structures. The arc surfaces of the upper adjustment block (23) and the lower adjustment block (24) are arranged opposite to each other.

7. The sugar solution energy-saving concentration equipment according to any one of claims 4 to 6, characterized in that: The front cover plate (29) is provided with a fixed sealing ring (25), the upper surface of the fixed sealing ring (25) is fixedly and sealingly connected to the front cover plate (29), the liquid retaining ring (16) is fixedly connected with a dynamic sealing ring (26), the outer ring of the dynamic sealing ring (26) is fixedly and seals the liquid retaining ring (16), and the inner ring of the dynamic sealing ring (26) is connected to the fixed sealing ring (25) in an upward and downward sliding sealing manner.

8. The sugar solution energy-saving concentration equipment according to claim 1, characterized in that: The outer sleeve of the infusion tube (4) is provided with a bevel gear (11), and the output end gear of the motor (10) is meshed with the bevel gear (11).

9. A sugar solution energy-saving concentration equipment method, based on claims 1-8, characterized in that: The following steps are included: S1. The liquid film evaporation generated by the rotation of the rotating disk (12) produces a large amount of secondary steam; S2. The steam compressor (1) recompresses the secondary steam and passes it into the rotating disk (12) to heat the liquid and discharge the steam; S3. The steam discharged from the rotating disk (12) enters the steam compressor (1) for recompression; S4. A portion of the hot steam recompressed in step S3 is used to pass into the rotating disk (12), and the other portion of the steam is passed into the preheater (2) to preheat the liquid feed.

10. The method for energy-saving concentration of sugar solution according to claim 9, characterized in that: In step S1, the centrifugal impeller (14) in the concentrator (3) rotates to generate negative pressure on the liquid film to perform vacuum evaporation and concentration.

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