An external-flow tube type falling film evaporation method and device

Abstract

The present invention relates to an external-flow tube type falling film evaporation method and device, which includes an upper liquid collecting box and a lower liquid collecting box with a hollow structure. The upper liquid collecting box of the heat exchange tube is connected to the lower liquid collecting box through a vertical rod. Heat exchange tubes are symmetrically and equidistantly arranged between the upper liquid collecting box and the lower liquid collecting box of the heat exchange tube and on the outer side of the vertical rod. Fixing plates are symmetrically and fixedly connected to the outer sides of the heat exchange tubes. The beneficial effect of the present invention is that through the external-flow tube type setting, it enables the staff to more conveniently understand the flow condition of the liquid inside the heat exchange tube, thus making it more convenient for the staff to more carefully understand the fluidity of the liquid and the internal condition of the heat exchange tube. Moreover, by setting an adjusting mechanism, the distance between the two heating plates can be adjusted, so that the liquid can be secondarily heated and evaporated by the two heating plates, thereby improving the evaporation efficiency of the liquid. Additionally, a temperature difference can be set between the two heating plates, so that the liquid can be better evaporated or condensed.

Description

Technical Field

[0001] The present invention relates to the technical field of falling film evaporation methods and equipment, and particularly relates to an external flow tube type falling film evaporation method and equipment. Background Art

[0002] Evaporation (or concentration) refers to the process of evaporating and concentrating a solution composed of a non-volatile solute and a volatile solvent, mainly achieved by heating to vaporize a part of the solvent in the solution. Evaporation processes are widely used in pharmaceutical production. For example, in traditional Chinese medicine production, the extract is evaporated and concentrated to obtain a concentrated solution or a fluid extract. Another example is in antibiotic production, where evaporation operations are used for the concentration of fermentation filtrates, resin eluates, and various extracts. Evaporation equipment is generally called an evaporator, which has a wide variety of structures and types, and has a long development history.

[0003] However, in the prior art, the heat exchange tubes in existing falling film evaporation devices are generally located inside the device. During the heat exchange and evaporation process, it is difficult for workers to observe the fluidity of the liquid well. Moreover, the positions of the heating plates in the current falling film evaporation devices are fixed. Such fixed heating positions are extremely inconvenient in actual use and cannot be adjusted according to the characteristics of different liquids, which easily leads to insufficient evaporation or over-evaporation of the liquid during the heat exchange process, and is not conducive to actual application and operation, and there is also a large room for improvement. Summary of the Invention

[0004] In view of the above problems existing in the prior art, the main purpose of the present invention is to provide an external flow tube type falling film evaporation method and equipment.

[0005] The technical solution of the present invention is as follows: An external flow tube type falling film evaporation equipment includes an upper liquid collection box and a lower liquid collection box with a hollow structure. The upper liquid collection box and the lower liquid collection box are connected by vertical rods. Symmetrically and equidistantly arranged outside the vertical rods between the upper liquid collection box and the lower liquid collection box are heat exchange tubes. Symmetrically and fixedly connected to the outside of the heat exchange tubes are fixing plates. Symmetrically and slidably connected between the two fixing plates on the outside of the heat exchange tubes are a first heating plate and a second heating plate, and an adjusting mechanism is arranged between the first heating plate and the second heating plate.

[0006] As a preferred embodiment, the adjusting mechanism includes a rotating shaft, and both ends of the rotating shaft are fixedly connected with a lead screw and a smooth rod, and moving blocks are arranged on the outside of both the lead screw and the smooth rod.

[0007] As a preferred embodiment, both the upper and lower ends of the moving block are rotatably connected with connecting rods. Between the first heating plate and the second heating plate, two fixing blocks are symmetrically and fixedly connected to the closer side. The ends of the connecting rods far away from the moving blocks are rotatably connected to the corresponding fixing blocks.

[0008] As a preferred embodiment, baffles are fixedly connected to the ends of the lead screw and the optical rod that are away from each other.

[0009] As a preferred embodiment, an adjusting nut is threadedly connected to the outside of the lead screw and inside the corresponding moving block. The adjusting nut is rotatably connected to the moving block. The corresponding moving block is connected to the lead screw through the adjusting nut, and the other moving block is slidably connected to the optical rod.

[0010] As a preferred embodiment, a liquid inlet pipe is fixedly connected to the top of the upper liquid collecting box, and a liquid outlet pipe is fixedly connected to the bottom of the lower liquid collecting box. One ends of the liquid inlet pipe and the liquid outlet pipe that are close to each other extend into the corresponding upper liquid collecting box and lower liquid collecting box.

[0011] As a preferred embodiment, both ends of the heat exchange tube extend into the corresponding upper liquid collecting box and lower liquid collecting box.

[0012] As a preferred embodiment, the liquid inlet pipe is connected to an external liquid supply device, and the liquid outlet pipe is connected to an external separation device.

[0013] A method for using an external flow tube type falling film evaporation device, characterized by comprising the following steps:

[0014] S1. First, connect the liquid inlet pipe to an external liquid supply device, input liquid into the upper liquid collecting box through the external liquid supply device, and then feed the liquid into each heat exchange tube through the upper liquid collecting box;

[0015] S2. Under the action of gravity, the liquid will be evenly distributed into each heat exchange tube and flow down along the inner wall of the heat exchange tube in a uniform film shape. The staff can observe the flowing liquid through the heat exchange tube in the form of an external flow tube, so as to better understand the natural flow situation of the liquid;

[0016] S3. And the distance between the first heating plate and the second heating plate can be adjusted according to different liquids through the adjusting mechanism, so that it can be adjusted according to the evaporation speed of different liquids, and the evaporation speed of the liquid can be controlled by adjusting the temperature difference between the two heating plates;

[0017] S4. For the viscosity of different liquids, the distance between the two heating plates can be adjusted. If the liquid has strong fluidity, the two heating plates can be stacked, so that the heating time can be increased when the liquid flows through;

[0018] S5. When the liquid viscosity is relatively high, the distance between the two heating plates can be adjusted to a larger value to avoid excessive evaporation of the liquid. Moreover, when the liquid passes through the gap between the two heating plates, it will be cooled for a period of time. When the cooled liquid passes through the second heating plate, it will be reheated, thus achieving a better evaporation effect.

[0019] S6. The vapor and liquid phase generated by the liquid after secondary evaporation will jointly flow into the separator through the lower liquid collection box. The separator will then fully separate the gas and liquid. Subsequently, the number of separators can be selected according to the actual evaporation effect for multiple separations.

[0020] S7. The secondary vapor generated by the gas-liquid will be discharged through the separator, or the secondary vapor can also be introduced into the next-stage separator according to actual needs to serve as heating kinetic energy.

[0021] S8. The separated liquid forms a concentrated liquid and is discharged through the outlet in the separator, thus achieving the working purpose of evaporating and concentrating the liquid.

[0022] Compared with the prior art, the advantages and positive effects of the present invention are as follows.

[0023] 1. Through the setting of the external flow tube type, the present invention enables the staff to more conveniently understand the flow situation of the liquid inside the heat exchange tube, thereby facilitating the staff to more carefully understand the fluidity of the liquid and the internal situation of the heat exchange tube.

[0024] 2. By setting the adjustment mechanism, the present invention can adjust the distance between the two heating plates, thereby achieving secondary heating and evaporation of the liquid through the two heating plates to improve the evaporation efficiency of the liquid. Moreover, a temperature difference can be set between the two heating plates to enable the liquid to evaporate or condense better. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Isometric view of an external flow tube type falling film evaporation device provided by the present invention;

[0026] Figure 2 Isometric view of an external flow tube type falling film evaporation device provided by the present invention;

[0027] Figure 3 Front view of an external flow tube type falling film evaporation device provided by the present invention;

[0028] Figure 4 Schematic diagram of the main structural mode of an external flow tube type falling film evaporation method provided by the present invention.

[0029] Legend: 1. Upper liquid collecting box; 2. Lower liquid collecting box; 3. Fixed plate; 4. Heat exchange tube; 5. First heating plate; 6. Second heating plate; 7. Rotating shaft; 8. Lead screw; 9. Smooth rod; 10. Moving block; 11. Connecting rod; 12. Fixed block; 13. Adjusting nut; 14. Baffle; 15. Liquid inlet pipe; 16. Liquid outlet pipe. Detailed implementation mode

[0030] To make the objectives, 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 some, but not all, of the embodiments of the present invention. Components of the embodiments of the present invention usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed 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.

[0031] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0032] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0033] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0034] Such as Figures 1-4As shown in the figure, the present invention provides a technical solution: an external flow tube falling film evaporation device, which includes an upper liquid collecting box 1 and a lower liquid collecting box 2 with a hollow structure. The upper liquid collecting box 1 and the lower liquid collecting box 2 are connected by vertical rods. Symmetrically and equidistantly arranged outside the vertical rods between the upper liquid collecting box 1 and the lower liquid collecting box 2 are heat exchange tubes 4. By providing the external heat exchange tubes 4, it enables the staff to better observe the flow condition of the liquid in the heat exchange tubes 4. Symmetrically and fixedly connected to the outside of the heat exchange tubes 4 are fixing plates 3. By providing two fixing plates 3, it can better limit the heat exchange tubes 4. Symmetrically and slidably connected to the outside of the heat exchange tubes 4 and between the two fixing plates 3 are a first heating plate 5 and a second heating plate 6 respectively. An adjusting mechanism is arranged between the first heating plate 5 and the second heating plate 6. By providing the adjusting mechanism, it can better control the distance between the first heating plate 5 and the second heating plate 6;

[0035] The adjusting mechanism includes a rotating shaft 7. Fixedly connected to the two ends of the rotating shaft 7 are a lead screw 8 and a smooth rod 9 respectively. Sliding blocks 10 are arranged on the outside of both the lead screw 8 and the smooth rod 9. By providing the lead screw 8, the rotation of the lead screw 8 can drive the sliding block 10 to move, and the smooth rod 9 can better assist in the cooperation;

[0036] Both the upper and lower ends of the sliding block 10 are rotatably connected with connecting rods 11. Through the connecting rods 11, the connection between the sliding block 10 and the first heating plate 5 and the second heating plate 6 is realized. Symmetrically and fixedly connected to the side of the first heating plate 5 and the second heating plate 6 close to each other are two fixing blocks 12 respectively. The ends of the connecting rods 11 far from the sliding block 10 are rotatably connected to the corresponding fixing blocks 12. By providing the fixing blocks 12, when the connecting rods 11 move, the first heating plate 5 and the second heating plate 6 can be driven to move through the fixing blocks 12, so as to achieve the working purpose of adjusting the distance between the first heating plate 5 and the second heating plate 6;

[0037] Fixedly connected to the ends of the lead screw 8 and the smooth rod 9 far from each other are baffles 14. By providing the baffles 14, it can prevent the sliding block 10 from falling off;

[0038] Threadedly connected to the outside of the lead screw 8 and inside the corresponding sliding block 10 is an adjusting nut 13. The adjusting nut 13 is rotatably connected to the sliding block 10. The corresponding sliding block 10 is connected to the lead screw 8 through the adjusting nut 13. The other sliding block 10 is slidably connected to the smooth rod 9. By providing the adjusting nut 13, the working purpose of controlling the position of the corresponding sliding block 10 can be achieved through the connection relationship between the adjusting nut 13 and the lead screw 8;

[0039] Fixedly connected to the top of the upper liquid collecting box 1 is a liquid inlet pipe 15. Fixedly connected to the bottom of the lower liquid collecting box 2 is a liquid outlet pipe 16. The ends of the liquid inlet pipe 15 and the liquid outlet pipe 16 close to each other extend into the corresponding upper liquid collecting box 1 and lower liquid collecting box 2 respectively. By providing the liquid inlet pipe 15 and the liquid outlet pipe 16, it can better transport and discharge the liquid;

[0040] Both ends of the heat exchange tube 4 extend into the corresponding upper liquid collecting box 1 and lower liquid collecting box 2. Through the above settings, liquid can enter the inside of the heat exchange tube 4 for heat exchange;

[0041] The liquid inlet pipe 15 is connected to an external liquid supply device, and the liquid outlet pipe 16 is connected to an external separation device. Through the above settings, the device can work better.

[0042] As Figures 1-4 shown, a method for using an external flow tube type falling film evaporation device includes the following steps:

[0043] S1. First, connect the liquid inlet pipe 15 to an external liquid supply device, input liquid into the upper liquid collecting box 1 through the external liquid supply device, and then feed the liquid into each heat exchange tube 4 through the upper liquid collecting box 1;

[0044] S2. Under the action of gravity, the liquid will be evenly distributed into each heat exchange tube 4 and flow down along the inner wall of the heat exchange tube 4 in a uniform film shape. The staff can observe the flowing liquid through the heat exchange tube 4 in the form of an external flow tube, so as to better understand the natural flow situation of the liquid;

[0045] S3. And the distance between the first heating plate 5 and the second heating plate 6 can be adjusted according to different liquids through the adjusting mechanism, so that the evaporation speed can be adjusted according to different liquids. Moreover, the evaporation speed of the liquid can be controlled by adjusting the temperature difference between the two heating plates. The user rotates the adjusting nut 13 to drive the corresponding moving block 10 to move. The movement of the moving block 10 will cause the connecting rod 11 to move, so that the distance between the first heating plate 5 and the second heating plate 6 is adjusted. The other moving block 10 will move on the optical rod 9 to play a matching role;

[0046] S4. For different liquid viscosities, the distance between the two heating plates can be adjusted. If the liquid has strong fluidity, the two heating plates can be stacked, so that the heating time can be increased when the liquid flows through. Through the operation in S3, not only the heating distance between the first heating plate 5 and the second heating plate 6 can be controlled, but also the operation effect in S4 can be achieved;

[0047] S5. When the liquid viscosity is high, the distance between the two heating plates can be adjusted to avoid excessive evaporation of the liquid. And when the liquid passes through the distance between the two heating plates, it will be cooled for a period of time. When the cooled liquid passes through the second heating plate 6, it will be reheated, so as to achieve a better evaporation effect;

[0048] S6. The vapor and liquid phase generated from the liquid after secondary evaporation will jointly flow into the separator through the lower liquid collecting box 2. The separator will then fully separate the gas and liquid. Subsequently, the number of separators can be selected according to the actual evaporation effect for multiple separations;

[0049] S7. The secondary vapor generated from the gas and liquid will be discharged through the separator. It can also be introduced into the next-stage separator according to actual needs to serve as heating kinetic energy;

[0050] S8. The separated liquid forms a concentrated liquid and is discharged from the outlet in the separator, thereby achieving the working purpose of evaporating and concentrating the liquid.

[0051] Finally, it should be noted that the above-described embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An external flow tube type falling film evaporation device, comprising an upper liquid collecting box (1) and a lower liquid collecting box (2) with a hollow structure, characterized in that: The upper liquid collecting box (1) and the lower liquid collecting box (2) are connected by vertical rods. Heat exchange tubes (4) are symmetrically and equidistantly arranged between the upper liquid collecting box (1) and the lower liquid collecting box (2) and on the outer side of the vertical rods. Fixed plates (3) are symmetrically and fixedly connected to the outer sides of the heat exchange tubes (4). A first heating plate (5) and a second heating plate (6) are respectively and symmetrically slidably connected between the two fixed plates (3) on the outer sides of the heat exchange tubes (4). An adjusting mechanism is arranged between the first heating plate (5) and the second heating plate (6). By setting the adjusting mechanism, the distance between the two heating plates can be adjusted. Through the arrangement of the external flow tube type, it is convenient to understand the flow condition of the liquid inside the heat exchange tube.

2. The external-flow tube type falling film evaporation device according to claim 1, wherein: The adjusting mechanism includes a rotating shaft (7). Threaded rods (8) and smooth rods (9) are respectively and fixedly connected to both ends of the rotating shaft (7). Moving blocks (10) are arranged on the outer sides of the threaded rods (8) and the smooth rods (9).

3. The external flow tube type falling film evaporation device according to claim 2, characterized in that: Link rods (11) are rotatably connected to the upper and lower ends of the moving blocks (10). Two fixed blocks (12) are symmetrically and fixedly connected between the closer sides of the first heating plate (5) and the second heating plate (6). The ends of the link rods (11) away from the moving blocks (10) are respectively rotatably connected to the corresponding fixed blocks (12).

4. The external flow tube type falling film evaporation device according to claim 2, wherein: Baffles (14) are fixedly connected to the ends of the threaded rods (8) and the smooth rods (9) away from each other.

5. The external-flow tube type falling film evaporation device according to claim 2, wherein: An adjusting nut (13) is threadedly connected to the outer side of the threaded rod (8) and inside the corresponding moving block (10). The adjusting nut (13) is rotatably connected to the moving block (10). The corresponding moving block (10) is connected to the threaded rod (8) through the adjusting nut (13). The other moving block (10) is slidably connected to the smooth rod (9).

6. The external flow tube type falling film evaporation device according to claim 1, wherein: A liquid inlet pipe (15) is fixedly connected to the top of the upper liquid collecting box (1). A liquid outlet pipe (16) is fixedly connected to the bottom of the lower liquid collecting box (2). The closer ends of the liquid inlet pipe (15) and the liquid outlet pipe (16) both extend into the corresponding upper liquid collecting box (1) and lower liquid collecting box (2).

7. The external flow tube type falling film evaporation device according to claim 1, characterized in that: Both ends of the heat exchange tube (4) extend into the corresponding upper liquid collecting box (1) and lower liquid collecting box (2).

8. The external flow tube type falling film evaporation device according to claim 6, characterized in that: The liquid inlet pipe (15) is connected to an external liquid supply device. The liquid outlet pipe (16) is connected to an external separation device.

9. The usage method of an external flow tube falling film evaporation device according to any one of claims 1-8, characterized in that: It includes the following steps: S1. First, connect the liquid inlet pipe (15) to an external liquid supply device. Input liquid into the upper liquid collecting box (1) through the external liquid supply device, and then feed the liquid into each heat exchange tube (4) through the upper liquid collecting box (1). S2. Under the action of gravity, the liquid will be evenly distributed into each heat exchange tube (4) and flow down along the inner wall of the heat exchange tube (4) in a uniform film shape. And the staff can observe the flowing liquid through the heat exchange tube (4) in the form of an external flow tube, so as to better understand the natural flow condition of the liquid. S3. Moreover, according to different liquids, the distance between the first heating plate (5) and the second heating plate (6) can be adjusted through the adjusting mechanism, so that it can be adjusted according to the evaporation rate of different liquids, and the evaporation rate of the liquid can be controlled by adjusting the temperature difference between the two heating plates; S4. For different viscosities of liquids, the distance between the two heating plates can be adjusted. When the fluidity of the liquid is strong, the two heating plates can be stacked, so that when the liquid flows through, the heating time can be increased; S5. When the viscosity of the liquid is high, the distance between the two heating plates can be increased to avoid excessive evaporation of the liquid. And when the liquid passes through the distance between the two heating plates, it will be cooled for a period of time. When the cooled liquid passes through the second heating plate (6), it will be reheated, so as to achieve a better evaporation effect; S6. The steam and liquid phase generated by the liquid after secondary evaporation will flow into the separator through the lower liquid collecting box (2). The separator will further separate the gas and liquid. Subsequently, according to the actual evaporation effect, the number of separators can be selected for multiple separations; S7. The secondary steam generated by the gas-liquid will be discharged through the separator, or the secondary steam can be introduced into the next-stage separator according to actual needs to serve as heating kinetic energy; S8. The separated liquid forms a concentrated liquid and is discharged from the outlet in the separator, so as to achieve the working purpose of evaporating and concentrating the liquid.

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