An eccentric evaporator

Abstract

The present invention belongs to the field of evaporators and proposes an eccentric evaporator, comprising a tank body, a discharge hopper, legs, a tank cover, a secondary steam outlet, a sensor connection port, a steam inlet, a condensate interface, a feed port, a discharge port, a control instrument, and a steam heating assembly. The discharge port is eccentrically arranged at the bottom of the discharge hopper. The steam heating assembly includes a heating well corresponding to the discharge port above and below. The exterior of the heating well is provided with a special-shaped wall sleeve that cooperates with the inner wall of the tank body. The special-shaped wall sleeve includes a cylindrical section and a fin plate group. The fin plate group includes a plurality of hollow fin plates distributed around the heating well. A condensation port is provided at one end of the hollow fin plate facing the center of the heating well. A condensate outlet pipe, an insulation pipe, and a drainage pipe are provided on the outlet side of the condensate outlet. The output end of the drainage pipe is connected to the condensate interface. The present invention has a reasonable design, a simple structure, can make the material flow in a sheet film, is conducive to improving heat transfer efficiency, has a good discharge effect, and has a high comprehensive utilization rate. It is suitable for large-scale promotion.

Description

Technical Field

[0001] The invention belongs to the field of evaporators, and in particular relates to an eccentric evaporator. Background Art

[0002] Evaporation involves heating a solution containing non-volatile solutes to boiling, vaporizing and removing some of the solvent, thereby increasing the solute concentration. Commonly used evaporators utilize inter-wall heat transfer and can be broadly categorized as circulating or single-pass, depending on the duration of the solution in the evaporator. Circulating evaporators include central circulation tubular evaporators, suspended basket evaporators, and Levin evaporators, while single-pass evaporators include rising film evaporators, falling film evaporators, and scraped-film evaporators.

[0003] Because the solution in a single-pass evaporator flows in a film-like manner, the convective heat transfer coefficient is higher than that of a circulating evaporator, making it more uniform and suitable for application. However, since the amount of water evaporated from the liquid is small, rising film evaporators struggle to achieve the required vapor velocity. Therefore, rising film evaporators are not suitable for evaporating concentrated solutions or materials with high viscosity, crystallization, or scaling. Falling film evaporators can evaporate highly concentrated, viscous, and heat-sensitive materials, but because the liquid film struggles to maintain a uniform distribution within the tube, the heat transfer coefficient is lower than that of rising film evaporators. Therefore, they are also unsuitable for materials prone to crystallization or scaling. Although scraped-film evaporators can be used for materials prone to crystallization or scaling, their structure is complex and energy consumption is high. Furthermore, the finished liquid from most evaporators is ultimately discharged through a central discharge system, such as the high-efficiency evaporation-condensation heat exchanger disclosed in CN213599896U. This makes bridging more likely, especially after the material is concentrated, affecting the actual discharge efficiency of the material. Summary of the Invention

[0004] In response to the technical problems existing in the above-mentioned evaporator, the present invention proposes an eccentric evaporator with reasonable design, simple structure, capable of making materials flow in a sheet-like film, conducive to improving heat transfer efficiency, good discharge effect and high comprehensive utilization rate.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows: an eccentric evaporator provided by the present invention comprises a tank body, a discharge hopper and a plurality of legs are provided at the bottom of the tank body, a tank cover is provided at the top of the tank body, a secondary steam outlet is provided on the tank cover, a plurality of sensor connection ports are provided on the tank body near the tank cover, a steam inlet, a condensate interface, a feed port, a discharge port and a control instrument are provided on the tank body, the discharge port is eccentrically arranged at the bottom of the discharge hopper and the side of the discharge hopper is a conical structure, a steam heating component is provided inside the tank body, the steam heating component comprises a heating well corresponding to the upper and lower sides of the discharge port, and a special-shaped wall sleeve is provided on the outside of the heating well to match the inner wall of the tank body. The heating well is eccentrically distributed with respect to the center of the special-shaped wall sleeve, and the special-shaped wall sleeve includes a cylindrical section, and a steam distribution cavity is formed between the cylindrical section and the tank body, and the steam distribution cavity is correspondingly connected to the steam inlet. A plurality of fin plate groups spaced apart up and down are provided on the cylindrical section, and the fin plate group includes a plurality of hollow fin plates distributed around the heating well, and the upper and lower adjacent hollow fin plates are staggered. The cross-section of the hollow fin plate is trapezoidal and a condensation port is provided at one end thereof facing the center of the heating well, and a condensation water outlet pipe is provided at the condensation port downwardly inclined, and an insulating pipe connected to all the condensation water outlet pipes is provided at the center of the heating well, and a drainage pipe is provided at the bottom of the insulating pipe, and the output end of the drainage pipe is connected to the condensation water interface.

[0006] Preferably, the top surface of the hollow fin is an inclined surface, the inclined surfaces of the hollow fins in the same fin group are located on the same inverted cone surface, the end of the hollow fin facing the heating well is an arc surface and the arc surfaces of the hollow fins in the same fin group are located on the same cylindrical surface.

[0007] Preferably, the number of hollow fins in the same fin group is 6 to 12 and they are distributed at equal angles.

[0008] Preferably, the condensate outlet pipe is sheathed with an epoxy resin tube, and the surface of the epoxy resin tube is provided with a heat insulation coating.

[0009] Preferably, the top of the condensate outlet pipe extends toward the secondary steam outlet and is higher than the horizontal height of the feed port. The top of the condensate outlet pipe is provided with an air outlet cap threadedly connected to it, and the side of the air outlet cap is provided with multiple air guide holes connected to the interior of the condensate outlet pipe.

[0010] Preferably, an annular sealing sleeve is provided at the top and bottom of the special-shaped wall sleeve, the sealing sleeve includes a nesting opening that is nested with the end of the special-shaped wall sleeve, and a threaded pair is provided between the sealing sleeve and the tank body.

[0011] Preferably, sealing ring plates are provided on the top and bottom of the cylindrical section, and the sealing ring plates are nested with the inner wall of the tank body. The side of the cylindrical section facing the inner wall of the tank body is a smooth cylindrical surface.

[0012] Preferably, three guide rods extending toward the discharge port are provided at the bottom of the condensate outlet pipe.

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

[0014] 1. The eccentric evaporator provided by the present invention can not only provide a cylindrical steam heat exchange atmosphere by adopting a special-shaped wall sleeve, but also distribute steam in the hollow fins to fully heat and boil the material. While improving the heating efficiency, the material flows in the form of a sheet film on the surface of the hollow fins, which is beneficial to improving the heat transfer efficiency of the equipment. It can be used for some materials that are easy to crystallize or scale, and the energy consumption is lower than that of the scraped-surface evaporator.

[0015] 2. The present invention provides an eccentric evaporator, in which the condensate outlet pipe, insulation pipe and drainage pipe can serve to draw out the condensate, and all the condensate outlet pipes form a mesh structure in the heating well, which can remove bubbles from the material, and the insulation pipe and drainage pipe located in the center of the heating well can guide the material. In addition, the eccentric design of the discharge port can effectively reduce the probability of bridging of the bottom material and improve the discharge efficiency of the equipment.

[0016] 3. This device has a reasonable design and simple structure. It can make the material flow in a sheet-like film, which is beneficial to improving the heat transfer efficiency, has a good discharge effect and a high comprehensive utilization rate, and is suitable for large-scale promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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 any creative work.

[0018] Figure 1 A cross-sectional view of an eccentric evaporator provided in an embodiment;

[0019] Figure 2 An axonometric view of an eccentric evaporator provided in an embodiment;

[0020] Figure 3 A front view of a steam heating assembly provided in an embodiment;

[0021] Figure 4 An axonometric view of a steam heating assembly provided for an embodiment;

[0022] Figure 5 A top view of a steam heating assembly provided in an embodiment;

[0023] In the above figures, 1. tank body; 11. sensor connection port; 12. steam inlet; 13. condensate interface; 14. feed port; 15. discharge port; 16. control instrument; 2. discharge hopper; 3. support leg; 4. tank cover; 41. secondary steam outlet; 5. steam heating component; 51. special-shaped wall sleeve; 511. cylindrical section; 512. fin plate group; 5121. hollow fin plate; 5122. condensate port; 513. sealing ring plate; 52. steam distribution chamber; 53. condensate outlet pipe; 54. insulation pipe; 55. drainage pipe; 56. air outlet cap; 561. air guide hole; 6. heating well; 7. sealing sleeve; 71. nesting port; 72. threaded pair; 8. guide rod. DETAILED DESCRIPTION

[0024] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described below with reference to the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features therein can be combined with each other unless they conflict. For the convenience of description, the words "upper", "lower", "left", and "right" appearing below only indicate the upper, lower, left, and right directions consistent with the drawings themselves and do not limit the structure.

[0025] 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.

[0026] Examples, such as Figure 1-5As shown, the present invention provides an eccentric evaporator, including a tank body 1, the bottom of the tank body 1 is provided with a discharge hopper 2 and a plurality of legs, the top of the tank body 1 is provided with a tank cover 4, the tank cover 4 is provided with a secondary steam outlet 41, the tank body 1 is provided with a plurality of sensor connection ports 11 at a position close to the tank cover 4, and the tank body 1 is provided with a steam inlet 12, a condensate interface 13, a feed port 14, a discharge port 15 and a control instrument 16. Among them, the sensor connection port 11 can be connected to a pressure sensor, a temperature sensor, a liquid level sensor and a pH meter, etc., and the control instrument 16 is used to display the pressure, temperature, liquid level and pH of the material inside the device and the working time of the device, etc.; the secondary steam outlet 41, the condensate interface 13, the feed port 14 and the discharge port 15 are existing technologies and will not be repeated here in this embodiment. In order to reduce the bridging of materials in the tank body 1, the discharge port 15 provided by the present invention is eccentrically arranged at the bottom of the discharge hopper 2, and the side of the discharge hopper 2 is a conical structure. By designing the discharge port 15 to be located at an eccentric position, the material can move at different speeds in different busbar directions on the inner wall of the discharge hopper 2, which is beneficial to reducing the probability of material bridging and improving the discharge efficiency of the material.

[0027] In order to improve the evaporation concentration efficiency of the present invention, a steam heating component 5 is provided inside the tank body 1. The steam heating component 5 includes a heating well 6 corresponding to the discharge port 15 above and below. The outside of the heating well 6 is provided with a special-shaped wall sleeve 51 that matches the inner wall of the tank body 1. The heating well 6 is eccentrically distributed with respect to the center of the special-shaped wall sleeve 51. The special-shaped wall sleeve 51 includes a cylindrical section 511. A steam distribution cavity 52 is formed between the cylindrical section 511 and the tank body 1. The steam distribution cavity 52 is correspondingly connected to the steam inlet 12. A plurality of upper and lower spaced distributions are provided on the cylindrical section 511. The fin plate group 512 includes a plurality of hollow fin plates 5121 distributed around the heating well 6. The upper and lower adjacent hollow fin plates 5121 are staggered. The cross section of the hollow fin plate 5121 is trapezoidal and a condensation port 5122 is provided at one end thereof facing the center of the heating well 6. A condensation water outlet pipe 53 is provided at the condensation port 5122, which is inclined downward. An insulation pipe 54 connected to all the condensation water outlet pipes 53 is provided at the center of the heating well 6. A drainage pipe 55 is provided at the bottom of the insulation pipe 54. The output end of the drainage pipe 55 is connected to the condensation water interface 13.

[0028] Specifically, the interior of the special-shaped wall sleeve 51 is used to pass steam, and the surface of the special-shaped wall sleeve 51 is used to directly contact the material to heat the material; wherein, the cylindrical section 511 of the special-shaped wall sleeve 51 provides a cylindrical steam heat exchange atmosphere, and steam can also be distributed in the hollow fins 5121 to fully heat and boil the material, and the secondary steam generated by boiling rises from the gap between adjacent hollow fins 5121 until it flows to the secondary steam outlet 41; for the material entering the heating well 6, on the one hand, it can be heated by the heat transfer effect inside the material, and on the other hand, it is heated by the secondary steam bypassing the hollow fins 5121. Since the area of ​​the heating well 6 is greatly reduced compared to the cross-section of the tank body 1, the material in the heating well 6 can also be fully heated. At the same time, as the material passes from top to bottom through the fin assembly 512, it flows in the form of a sheet-like film on the surface of the hollow fins 5121. Because the upper and lower hollow fins 5121 are staggered, the material has ample distribution area, which helps improve the heat transfer efficiency of this equipment. The heat transfer efficiency is greater than that of rising-film evaporators and falling-film evaporators, and it is suitable for some materials prone to crystallization or scaling. Furthermore, the energy consumption is lower than that of scraped-surface evaporators. It should be noted that the shaped wall sleeves 51 of the hollow fins 5121 can be selected with different upper and lower spacings based on the material concentration and the material's flow characteristics, which helps to effectively form a sheet-like film on the surface of the hollow fins 5121.

[0029] Furthermore, the condensate outlet pipe 53, the insulation pipe 54, and the drainage pipe 55 serve to drain the condensate, and all of the condensate outlet pipes 53 form a mesh structure within the heating well 6, which can remove bubbles from the material. The heating well 6 is eccentrically distributed, resulting in a difference in the flow rate of the material flowing from the ends of the different hollow fin plates 5121. The insulation pipe 54 and drainage pipe 55 located at the center of the heating well 6 serve to guide the material. Combined with the eccentric design of the discharge port 15, this effectively reduces the probability of bridging of the material at the bottom, thereby improving the discharge efficiency of the device.

[0030] In order to improve the fluidity of the material, the top surface of the hollow fin 5121 provided by the present invention is an inclined curved surface. The inclined curved surfaces of the hollow fins 5121 in the same fin group 512 are located on the same inverted cone surface. The end of the hollow fin 5121 facing the heating well 6 is an arc surface, and the arc surfaces of the hollow fins 5121 in the same fin group 512 are located on the same cylindrical surface. If the arc surfaces of the hollow fins 5121 are located on the same cylindrical surface, the heating well 6 can have a relatively uniform cylindrical surface, avoiding excessive retention of materials on the hollow fins 5121 at different layers. Furthermore, while the material forms a sheet-like film on the surface of the hollow fin 5121, it also has a tendency to flow from the distal end to the heating well 6, and it is also beneficial for the material in the heating well 6 to obtain sufficient heat, thereby ensuring the heating efficiency of the equipment for the material and the applicability to different materials, thereby improving the comprehensive utilization rate of the equipment.

[0031] To ensure efficient vertical flow of materials, the present invention provides 6 to 12 hollow fins 5121 within the same fin assembly 512, spaced at equal angles with an angle of no greater than 15 degrees. By providing a reasonable number of hollow fins 5121 and spacing them at appropriate angles, a reasonable contact area between the hollow fins 5121 and the material can be maintained. The resulting sheet membrane can effectively receive heat from the hollow fins 5121, while the material essentially flows toward the heating well 6. This also reduces the heating load of the heating well 6, achieving both good vertical flow efficiency and good heating efficiency.

[0032] To improve the efficiency of condensate drainage, and considering the heat content of the material in heating well 6, the present invention includes an epoxy resin tube overlying condensate outlet pipe 53. The epoxy resin tube is coated with a thermal insulation coating. The epoxy resin tube and thermal insulation coating provide high-temperature resistance and thermal insulation for condensate outlet pipe 53, reducing the likelihood of condensate absorbing heat and improving the efficiency of condensate flowing out of condensate outlet pipe 53 and drainage pipe 55.

[0033] To improve the utilization of the condensate outlet pipe 53, the top of the condensate outlet pipe 53 provided in the present invention extends toward the secondary steam outlet 41 and is higher than the level of the feed inlet 14. A gas outlet cap 56 is threadedly connected to the top of the condensate outlet pipe 53. The side of the gas outlet cap 56 is provided with multiple gas guide holes 561 that connect to the interior of the condensate outlet pipe 53. Steam generated by the evaporation of the condensate by heat can be discharged through the gas guide holes 561. The vertical extension of the condensate outlet pipe 53 allows it to drain the material.

[0034] In order to improve the sealing performance of the upper and lower ends of the steam distribution chamber 52, the top and bottom of the special-shaped wall sleeve 51 provided by the present invention are both provided with an annular sealing sleeve 7. The sealing sleeve 7 includes a nesting opening 71 that nests with the end of the special-shaped wall sleeve 51, and a threaded pair is provided between the sealing sleeve 7 and the tank body 1. Furthermore, the top and bottom of the cylindrical section 511 are both provided with a sealing ring plate 513. The sealing ring plate 513 nests with the inner wall of the tank body 1, and the side of the cylindrical section 511 facing the inner wall of the tank body 1 is a smooth cylindrical surface. In this way, by providing the sealing ring plate 513 to reduce the assembly gap between the upper and lower ends of the special-shaped wall sleeve 51, the threaded connection of the sealing sleeve 7 is utilized to further improve the sealing performance of the steam distribution chamber 52, and it also plays a positioning role.

[0035] In order to reduce the probability of bridging of materials within the conical range of the discharge hopper 2, the present invention is provided with three guide rods 8 extending toward the discharge port 15 at the bottom of the condensate outlet pipe 53. The guide rods 8 are used to lengthen the axial length of the drainage structure in the center of the heating well 6, increase the drainage span, improve the discharge effect of the material, and improve the discharge efficiency.

[0036] 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. An eccentric evaporator, comprising a tank body, a discharge hopper and a plurality of legs being provided at the bottom of the tank body, a tank cover being provided at the top of the tank body, a secondary steam outlet being provided on the tank cover, a plurality of sensor connection ports being provided near the tank cover, a steam inlet, a condensate interface, a feed port, a discharge port and a control instrument being provided on the tank body, characterized in that: The discharge port is eccentrically arranged at the bottom of the discharge hopper and the side of the discharge hopper is a conical structure, a steam heating component is arranged inside the tank body, the steam heating component includes a heating well corresponding to the upper and lower discharge port, and the outside of the heating well is provided with a special-shaped wall sleeve that cooperates with the inner wall of the tank body, the heating well is eccentrically distributed about the center of the special-shaped wall sleeve, the special-shaped wall sleeve includes a cylindrical section, a steam distribution chamber is formed between the cylindrical section and the tank body, the steam distribution chamber is correspondingly connected to the steam inlet, a plurality of fin plate groups distributed at intervals up and down are provided on the cylindrical section, the fin plate group includes a plurality of hollow fin plates distributed around the heating well, and the upper and lower adjacent hollow fin plates are staggered, the cross-section of the hollow fin plate is trapezoidal and a condensation port is provided at one end thereof facing the center of the heating well, a condensation port is provided at the condensation port, a condensation water outlet pipe is provided downwardly inclined, an insulated pipe connected to all condensation water outlet pipes is provided at the center of the heating well, a drainage pipe is provided at the bottom of the insulated pipe, and the output end of the drainage pipe is connected to the condensation water interface.

2. The eccentric evaporator according to claim 1, characterized in that: The top surface of the hollow fin is an inclined surface, the inclined surfaces of the hollow fins in the same fin group are located on the same inverted cone surface, the end of the hollow fin facing the heating well is an arc surface and the arc surfaces of the hollow fins in the same fin group are located on the same cylindrical surface.

3. The eccentric evaporator according to claim 2, characterized in that: The number of hollow fin plates in the same fin plate group is 6 to 12 and they are distributed at equal angles.

4. The eccentric evaporator according to claim 1, characterized in that: An epoxy resin tube is sleeved on the condensed water outlet pipe, and a heat insulation coating is provided on the surface of the epoxy resin tube.

5. An eccentric evaporator according to claim 1 or 4, characterized in that: The top of the condensate outlet pipe extends toward the secondary steam outlet and is higher than the horizontal height of the feed port. The top of the condensate outlet pipe is provided with an air outlet cap threadedly connected to it, and the side of the air outlet cap is provided with multiple air guide holes connected to the interior of the condensate outlet pipe.

6. The eccentric evaporator according to claim 1, characterized in that: The top and bottom of the special-shaped wall sleeve are both provided with an annular sealing sleeve, and the sealing sleeve comprises a nesting opening which is nested with the end of the special-shaped wall sleeve, and a threaded pair is provided between the sealing sleeve and the tank body.

7. The eccentric evaporator according to claim 6, characterized in that: The top and bottom of the cylindrical section are both provided with sealing ring plates, which are nested with the inner wall of the tank body. The side of the cylindrical section facing the inner wall of the tank body is a smooth cylindrical surface.

8. The eccentric evaporator according to claim 1, characterized in that: The bottom of the condensate outlet pipe is provided with three guide rods extending toward the discharge port.

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