Eccentric evaporator

Abstract

The invention belongs to the field of evaporators, and provides an eccentric evaporator which comprises a tank body, a discharging hopper, supporting legs, a tank cover, a secondary steam outlet, a sensor connecting port, a steam inlet, a condensate water connector, a feeding port, a discharging port, a control instrument and a steam heating assembly. The steam heating assembly comprises a heating well vertically corresponding to the discharging opening, a special-shaped wall sleeve matched with the inner wall of the tank body is arranged outside the heating well and comprises a cylindrical section and a fin plate set, the fin plate set comprises a plurality of hollow fin plates distributed around the heating well, and a condensation opening is formed in the end, facing the center of the heating well, of each hollow fin plate. A condensate water leading-out pipe, a heat insulation pipe and a drainage pipe are arranged on the leading-out side of the condensation opening, and the output end of the drainage pipe is connected with the condensate water connector. The device is reasonable in design, simple in structure, capable of enabling materials to flow in a sheet-shaped film mode, beneficial to improvement of heat transfer efficiency, good in discharging effect, high in comprehensive utilization rate and suitable for large-scale popularization.

Description

Technical Field

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

[0002] Evaporation is the process of heating a solution containing non-volatile solutes to boiling conditions, vaporizing and removing part of the solvent, thereby increasing the concentration of the solute in the solvent. Commonly used evaporators mostly use inter-wall heat transfer, and can be roughly divided into two categories: circulation type and single-pass type according to the residence time of the solution in the evaporator. Among them, circulation evaporators include central circulation tube evaporators, hanging basket evaporators and Levin evaporators, and single-pass evaporators include rising film evaporators, falling film evaporators and scraped film evaporators.

[0003] Since the solution in the single-pass evaporator flows in a film-like manner, the convective heat transfer coefficient is higher than that of the circulating evaporator, so it is more uniform and better than the latter. However, since the amount of water evaporated from the liquid is not much, it is difficult to achieve the vapor velocity that meets the rising requirements of the rising film evaporator, so the rising film evaporator is not suitable for the evaporation of concentrated solutions, nor is it suitable for materials with high viscosity, easy crystallization or easy scaling; the falling film evaporator can evaporate materials with high concentration, high viscosity and heat sensitivity, but because it is difficult to maintain a uniform distribution of the liquid film in the tube, the heat transfer coefficient is smaller than that of the rising film evaporator, so it is not suitable for materials that are easy to crystallize or scale; although the scraper evaporator can be used for materials that are easy to crystallize or scale, it has a complex structure and high energy consumption. In addition, the finished liquid of most evaporators finally enters the next process through a central discharge, such as a high-efficiency evaporation and condensation heat exchanger disclosed in CN213599896U, which is prone to bridging, especially after the material is concentrated, affecting the actual discharge efficiency of the material. Summary of the invention

[0004] In view of 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 film, conducive to improving heat transfer efficiency, better discharge effect and higher 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 arranged at the bottom of the tank body, a tank cover is arranged at the top of the tank body, a secondary steam outlet is arranged on the tank cover, a plurality of sensor connection ports are arranged at a position close to the tank cover, a steam inlet, a condensate interface, a feed port, a discharge port and a control instrument are arranged 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 arranged inside the tank body, the steam heating component comprises a heating well corresponding to the upper and lower portions of the discharge port, and a special-shaped wall sleeve matching the inner wall of the tank body is arranged outside the heating well, 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, 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, and a plurality of fin plate groups spaced apart from each other are arranged on the cylindrical section, and the fin plate groups include a plurality of hollow fin plates distributed around the heating well, and the upper and lower adjacent hollow fin plates are staggeredly distributed, and the cross-section of the hollow fin plate is trapezoidal and a condensation port is arranged at one end thereof facing the center of the heating well, and a condensation water outlet pipe is arranged at the condensation port inclined downward, and an insulation pipe connected to all condensation water outlet pipes is arranged at the center of the heating well, and a drainage pipe is arranged at the bottom of the insulation 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 direction and is higher than the horizontal height of the feed port, and the top of the condensate outlet pipe is provided with an air outlet cap threadedly connected thereto, and the side of the air outlet cap is provided with a plurality of air guide holes connected to the interior of the condensate outlet pipe.

[0010] Preferably, an annular sealing sleeve is provided at the top and the bottom of the special-shaped wall sleeve, 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.

[0011] Preferably, sealing ring plates are provided at the top and the 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 fin plate 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 fin plate, which is beneficial to improving the heat transfer efficiency of the equipment. It can be applied to some materials that are easy to crystallize or scale, and the energy consumption is lower than that of the scraper evaporator.

[0015] 2. The present invention provides an eccentric evaporator, in which the condensate outlet pipe, the insulation pipe and the 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 the 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. The device has reasonable design and simple structure, can make the material flow in a sheet-like film, is conducive to improving the heat transfer efficiency, has good discharge effect and 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 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.

[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 for 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 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. For the convenience of description, if the words "upper", "lower", "left" and "right" appear below, they only indicate that the upper, lower, left and right directions are consistent with the accompanying 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 of the following disclosure.

[0026] Examples, such as Figure 1-5As shown, an eccentric evaporator provided by the present invention comprises a tank body 1, a discharge hopper 2 and a plurality of legs are arranged at the bottom of the tank body 1, a tank cover 4 is arranged at the top of the tank body 1, a secondary steam outlet 41 is arranged on the tank cover 4, a plurality of sensor connection ports 11 are arranged at a position close to the tank cover 4, and a steam inlet 12, a condensate interface 13, a feed port 14, a discharge port 15 and a control instrument 16 are arranged on the tank body 1. 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 prior arts, and this embodiment will not be repeated here. In order to reduce the situation of 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 set at an eccentric position, the material has different moving speeds in different generatrix directions on the inner wall of the discharge hopper 2, which is beneficial to reducing the probability of boring bridges and improving the discharge efficiency of the material.

[0027] In order to improve the evaporation concentration efficiency of the device, the present invention is provided with a steam heating component 5 inside the tank body 1, the steam heating component 5 includes a heating well 6 corresponding to the discharge port 15 above and below, and a special-shaped wall sleeve 51 matched with the inner wall of the tank body 1 is provided outside the heating well 6, and the heating well 6 is eccentrically distributed with respect to the center of the special-shaped wall sleeve 51, and the special-shaped wall sleeve 51 includes a cylindrical section 511, and a steam distribution cavity 52 is formed between the cylindrical section 511 and the tank body 1, and the steam distribution cavity 52 is correspondingly connected to the steam inlet 12, and 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, and the upper and lower adjacent hollow fin plates 5121 are staggeredly distributed. 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 and inclined downward. An insulating pipe 54 connected to all 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 insulating pipe 54, and 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 for passing steam, and the surface of the special-shaped wall sleeve 51 is used for directly contacting 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 fin plate 5121 to fully heat and boil the material, and the secondary steam generated by boiling rises from the gap between adjacent hollow fin plates 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 range of the hollow fin plate 5121. Since the area of ​​the heating well 6 is greatly reduced compared with the cross-section of the tank body 1, the material in the heating well 6 can also be fully heated. At the same time, when the material passes through the fin plate group 512 from top to bottom, it flows in the form of a sheet film on the surface of the hollow fin plate 5121, and because the upper and lower hollow fin plates 5121 are staggered, the material has a sufficient distribution area, which is conducive to improving the heat transfer efficiency of the equipment. The heat transfer efficiency is greater than that of the rising film evaporator and the falling film evaporator, and it can be applied to some materials that are easy to crystallize or scale, and the energy consumption is less than that of the scraper evaporator. It should be noted that the special-shaped wall sleeve 51 of the hollow fin plate 5121 with different upper and lower spacing distances can be selected according to the concentration of the material and the flow characteristics of the material itself, which is conducive to the material reasonably forming a sheet film on the surface of the hollow fin plate 5121.

[0029] Furthermore, the condensate outlet pipe 53, the insulation pipe 54 and the drainage pipe 55 can be used to lead out the condensate, and all the condensate outlet pipes 53 form a mesh structure in the heating well 6, which can remove bubbles from the material. The heating well 6 is eccentrically distributed, and there is a speed difference between the flow rates of the materials flowing away from the ends of the surfaces of different hollow fin plates 5121, and the insulation pipe 54 and the drainage pipe 55 located at the center of the heating well 6 can guide the materials. In addition, the eccentric design of the discharge port 15 can effectively reduce the probability of bridging of the bottom materials and improve the discharge efficiency of the equipment.

[0030] In order to improve the fluidity of the material, the top surface of the hollow fin plate 5121 provided by the present invention is an inclined curved surface, the inclined curved surfaces of the hollow fin plates 5121 in the same fin plate group 512 are located on the same inverted cone surface, the end of the hollow fin plate 5121 facing the heating well 6 is an arc surface, and the arc surfaces of the hollow fin plates 5121 in the same fin plate group 512 are located on the same cylindrical surface. If the arc surfaces of the hollow fin plates 5121 are located on the same cylindrical surface, the heating well 6 can have a relatively uniform cylindrical surface, avoiding excessive stay of the material on the hollow fin plates 5121 of different layers. Furthermore, while the material forms a sheet-like film on the surface of the hollow fin plate 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] In order to improve the up-and-down flow efficiency of the material, the number of hollow fins 5121 in the same fin set 512 provided by the present invention is 6 to 12 and is distributed at equal angles, and the interval angle is not greater than 15 degrees. By setting a reasonable number and reasonable interval angle of hollow fins 5121, the hollow fins 5121 can maintain a reasonable contact area with the material, and the formed sheet film can obtain effective heat from the hollow fins 5121, and the material basically flows to the heating well 6, so this can also reduce the heating load of the heating well 6, so as to obtain both better up-and-down flow efficiency and better heating efficiency.

[0032] In order to improve the efficiency of condensed water extraction, considering that the material in the heating well 6 has a certain amount of heat, the present invention sets an epoxy resin tube on the condensed water extraction pipe 53, and the surface of the epoxy resin tube is provided with a heat insulation coating. The epoxy resin tube and the heat insulation coating can provide high temperature resistance and heat insulation protection for the condensed water extraction pipe 53, reduce the probability of condensed water absorbing heat, and improve the efficiency of condensed water flowing out of the condensed water extraction pipe 53 and the drainage pipe 55.

[0033] In order to improve the utilization rate of the condensed water outlet pipe 53, the top of the condensed water outlet pipe 53 provided by the present invention extends toward the secondary steam outlet 41 and is higher than the horizontal height of the feed port 14. The top of the condensed water outlet pipe 53 is provided with an air outlet cap 56 threadedly connected thereto, and the side of the air outlet cap 56 is provided with a plurality of air guide holes 561 connected to the inside of the condensed water outlet pipe 53. The steam generated by the evaporation of a part of the condensed water by heat can be discharged from the air guide holes 561, and the upper and lower extension range of the condensed water outlet pipe 53 can enable it to play a role in draining 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 is nested 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 barrel section 511 are both provided with a sealing ring plate 513, the sealing ring plate 513 is nested with the inner wall of the tank body 1, and the side of the barrel section 511 facing the inner wall of the tank body 1 is a smooth cylindrical surface. In this way, the assembly gap between the upper and lower ends of the special-shaped wall sleeve 51 is reduced by providing the sealing ring plate 513, and the threaded connection of the sealing sleeve 7 is used 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 at 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 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. An eccentric evaporator, comprising a tank body, a discharge hopper and a plurality of legs are arranged at the bottom of the tank body, a tank cover is arranged at the top of the tank body, a secondary steam outlet is arranged on the tank cover, a plurality of sensor connection ports are arranged 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 arranged 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 parts of the discharge port, a special-shaped wall sleeve matching the inner wall of the tank body is arranged outside the heating well, 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 cavity is formed between the cylindrical section and the tank body, the steam distribution cavity is correspondingly connected to the steam inlet, a plurality of fin plate groups spaced apart from each other are arranged on the cylindrical section, the fin plate group includes a plurality of hollow fin plates distributed around the heating well, 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 arranged at one end thereof facing the center of the heating well, a condensation water outlet pipe is arranged at the condensation port downwardly, an insulation pipe connected to all condensation water outlet pipes is arranged at the center of the heating well, a drainage pipe is arranged at the bottom of the insulation 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 plate is an inclined surface, the inclined surfaces of the hollow fin plates in the same fin plate group are located on the same inverted cone surface, the end of the hollow fin plate facing the heating well is an arc surface and the arc surfaces of the hollow fin plates in the same fin plate 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: The condensate outlet pipe is sleeved with an epoxy resin pipe, and the surface of the epoxy resin pipe is provided with a heat insulation coating.

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 direction 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, 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, and the sealing ring plates are nested and matched with the inner wall of the tank body. The side surface 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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