Small temperature difference and low temperature centrifugal film evaporator

Abstract

The present invention relates to the technical field of low-temperature difference evaporators, specifically a small-temperature-difference low-temperature centrifugal film-forming evaporator. A steam inlet communicating with a rotating pipe is vertically arranged on a mounting block, and the mounting block is rotatably installed on a fixing frame. A plurality of circular fins are arranged on the outer wall of the heat exchange pipe. The beneficial effects are as follows: By arranging three layers of pipes, the liquid to be evaporated enters from the center along the axis through a feed pipe, and then is atomized and swept radially along the axis. The liquid impacts the heated surface of the heat exchange pipe in the form of droplets, slides rapidly on the fins in a film shape, separates from the heated surface, and impacts the adjacent fins again. The residence time is in the millisecond level, which is several times shorter than that of traditional continuous falling film evaporators (the residence time is in the order of seconds) and full liquid large-capacity pool evaporators (the residence time is in the order of minutes). Therefore, it has a better separation and uniform heating effect on heat-sensitive materials and improves the separation accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of low-temperature difference evaporators, specifically a small-temperature-difference low-temperature centrifugal film-forming evaporator. Background Art

[0002] In the process of separating different mixed materials, most of the existing technologies adopt centrifugal evaporation, achieving gasification according to different boiling points to realize the separation of raw materials.

[0003] In the prior art, a centrifugal scraping thin-film evaporator with convenient scraping, with the application number: CN201920873768.8, discloses achieving separation through rotational evaporation by centrifugal force.

[0004] However, in the actual separation process, especially for materials with a small temperature difference and high thermal sensitivity, during evaporation, due to the small temperature difference, the requirement for temperature control accuracy increases, and the separation purity is relatively low. During the centrifugal heating process, uneven heating is likely to occur. Summary of the Invention

[0005] The purpose of the present invention is to provide a small-temperature-difference low-temperature centrifugal film-forming evaporator to solve the problems of rapid and accurate centrifugal heating and separation of materials with a small temperature difference and high thermal sensitivity.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A small-temperature-difference low-temperature centrifugal film-forming evaporator, the evaporator comprising:

[0008] A pressure-bearing outer cylinder, a base is provided at the lower end of the pressure-bearing outer cylinder, an exhaust port is provided at the upper end of the pressure-bearing outer cylinder, a discharge pipe is provided at the lower end of the pressure-bearing outer cylinder, a pair of fixing brackets are symmetrically arranged on both sides of the pressure-bearing outer cylinder, and a mounting bracket is arranged in parallel on the outside of the fixing bracket;

[0009] A heat exchanger, the heat exchanger includes a pair of rotation pipes symmetrically arranged on the left and right, a buffer cylinder, and heat exchange pipes. A pair of the buffer cylinders symmetrically arranged on the left and right are installed in the inner cavity of the pressure-bearing outer cylinder. A plurality of groups of parallel heat exchange pipes arranged in a circumferential array are inserted between adjacent buffer cylinders. One end of the rotation pipe communicates with the buffer cylinder, the other end of the rotation pipe is rotatably connected to a mounting block, a steam inlet communicating with the rotation pipe is vertically arranged on the mounting block, the mounting block is rotatably installed on the fixing bracket, and a plurality of groups of circular fins are arranged on the outer wall of the heat exchange pipe;

[0010] A feed pipe, the feed pipe is inserted through and in the heat exchanger, one end of the feed pipe is fixed on the mounting bracket, the other end of the feed pipe is provided with a connecting pipe, the connecting pipe is fixed on the mounting bracket on the other side, the connecting pipe communicates with the buffer cylinder far from the steam inlet, the feed pipe includes a fixed pipe and an inner pipe, one end of the fixed pipe communicates with the feed port, and through holes are provided at the positions of the fixed pipe corresponding to the fins.

[0011] Preferably, one end of the rotating pipe communicates with the buffer cylinder. The outer wall of the rotating pipe is rotatably sleeved on the inner walls at both ends of the pressure-bearing outer cylinder through a rotating bearing. A bearing seat is arranged in the middle of the rotating pipe. One end of the bearing seat is hermetically pressed on the port of the pressure-bearing outer cylinder, and the bearing seat is rotatably connected with the rotating pipe.

[0012] Preferably, a stepped connecting clamping pipe is rotatably connected to the end of the rotating pipe by threads. The connecting clamping pipe is inserted into the mounting block, and the stepped surface of the connecting clamping pipe is clamped in the inner cavity of the mounting block. The connecting clamping pipe communicates the mounting block with the rotating pipe.

[0013] Preferably, sealing end plates are arranged on a pair of the fixed frames that are symmetric left and right. The sealing end plates are hermetically inserted into the inner cavity of the mounting block, and the sealing end plates are fixedly connected to the mounting block by screws.

[0014] Preferably, a sprocket is fixedly sleeved on the outer wall of the middle section of the rotating pipe, and the sprocket meshes with a gear driven by an external motor.

[0015] Preferably, a lubricating flow channel is arranged on the bearing seat. The lubricating flow channel is externally connected to cooling water, and the lubricating flow channel communicates the inner cavity of the bearing seat with the rotating bearing.

[0016] Preferably, a pair of uniform distribution plates are vertically arranged between a pair of the buffer cylinders that are symmetric left and right. Both ends of the heat exchange pipe are fixed in the uniform distribution plates, and both ends of the heat exchange pipe communicate with the buffer cylinders. The feed pipe rotatably penetrates through the uniform distribution plates, and sealing bearing blocks are arranged at the connection positions of the feed pipe and the pair of uniform distribution plates that are symmetric left and right. A right-angle pipe is arranged at the end of the feed pipe, and the right-angle pipe is fixed on the mounting frame. The right-angle pipe communicates the fixed pipe with the feed port.

[0017] Preferably, the sealing bearing blocks are fixedly sleeved on the outer wall of the fixed pipe. The sealing bearing block on the side close to the connecting pipe is rotatably connected to the connecting pipe by threads, and a drain pipe is vertically arranged at the end of the connecting pipe. The middle section of the connecting pipe penetrates through the rotating pipe, and the end of the connecting pipe is fixed on the mounting frame on the right side. A sealing cover plate is arranged at the port of the connecting pipe, and the drain pipe communicates with the buffer cylinder.

[0018] Preferably, arc-shaped end covers are arranged at both ends of the pressure-bearing outer cylinder. The pressure-bearing outer cylinder and the end covers are fixedly and hermetically connected through flange plates. The exhaust port on the pressure-bearing outer cylinder faces the outside of multiple groups of fins distributed in a circumferential array, and the through hole faces the inside of the fins.

[0019] Preferably, the fins are circular ring-shaped, and the outer wall of the fins is wavy. The fins are fixedly sleeved on the outer wall of the middle section of the heat exchange pipe, and a gap is left between adjacent heat exchange pipes.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] In the present invention, by arranging three layers of pipes, the liquid to be evaporated enters from the center along the axial direction through the feed pipe, and then is atomized and swept along the radial direction. The liquid impacts the heated surface of the heat exchange pipes in the form of droplets, slides rapidly on the fins in a film state, separates from the heated surface, impacts the adjacent fins again, and the residence time is in the millisecond level. Compared with the traditional continuous falling film evaporator (residence time in the order of seconds) and the full liquid large-capacity evaporator (residence time in the order of minutes), the time is several times shorter. Therefore, it has a better separation and uniform heating effect for heat-sensitive materials, and improves the separation accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a side view of the present invention;

[0023] Figure 2 is a cross-sectional view taken along the A-A section of the present invention;

[0024] Figure 3 is a schematic diagram of the X-X section of the present invention;

[0025] Figure 4 is a schematic diagram of the rotational mounting structure of the rotating pipe of the present invention;

[0026] Figure 5 is a schematic diagram of the connection structure between the fin and the heat exchange pipe of the present invention;

[0027] Figure 6 is a three-dimensional schematic diagram of the connection structure between the fin and the heat exchange pipe of the present invention.

[0028] In the figure: 1, pressure-bearing outer cylinder; 2, heat exchanger; 3, feed pipe; 4, drain pipe; 5, bearing seat; 6, sealing end plate; 7, rotating bearing; 8, sealing bearing block; 9, mounting block; 10, steam inlet; 11, fixing frame; 12, exhaust port; 13, discharge pipe; 14, fin; 15, rotating pipe; 16, lubricating flow channel; 17, mounting frame; 18, distribution plate; 19, sprocket; 20, feed port; 21, heat exchange pipe; 22, fixed pipe; 23, through hole; 24, inner pipe; 25, connecting pipe; 26, sealing cover plate; 27, flange plate; 28, base; 29, right-angle pipe; 30, buffer cylinder; 31, connecting clamping pipe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] Please refer to Figures 1 to 6, the present invention provides a technical solution:

[0031] Example 1:

[0032] A small temperature difference low-temperature centrifugal film-forming evaporator, the evaporator includes a pressure-bearing outer cylinder 1, a heat exchanger 2 and a feed pipe 3.

[0033] A base 28 is provided at the lower end of the pressure-bearing outer cylinder 1, an exhaust port 12 is provided at the upper end of the pressure-bearing outer cylinder 1, a discharge pipe 13 is provided at the lower end of the pressure-bearing outer cylinder 1, and a pair of fixing frames 11 are symmetrically arranged on both sides of the pressure-bearing outer cylinder 1. An installation frame 17 is arranged in parallel on the outside of the fixing frame 11.

[0034] The heat exchanger 2 includes a pair of symmetrically arranged rotating pipes 15, a buffer cylinder 30 and heat exchange pipes 21. A pair of symmetrically arranged buffer cylinders 30 are installed in the inner cavity of the pressure-bearing outer cylinder 1. A plurality of groups of parallel heat exchange pipes 21 arranged in a circumferential array are inserted between adjacent buffer cylinders 30, and one end of the rotating pipe 15 communicates with the buffer cylinder 30.

[0035] The steam entering the air is buffered by the buffer cylinder 30, and the liquid material is heated through the heat exchange pipes 21.

[0036] The other end of the rotating pipe 15 is rotatably connected to the mounting block 9. A steam inlet 10 communicating with the rotating pipe 15 is vertically arranged on the mounting block 9. The mounting block 9 is rotatably installed on the fixing frame 11. A plurality of circular fins 14 are arranged on the outer wall of the heat exchange pipe 21.

[0037] Through the rotational installation of the rotating pipe 15, the centrifugal rotation of the heat exchanger 2 is realized. Steam enters from the steam inlet 10 and enters the circumferentially arrayed heat exchange pipes 21 along the buffer cylinder 30 to achieve the purpose of heat exchange.

[0038] The feed pipe 3 is inserted through and in the heat exchanger 2. One end of the feed pipe 3 is fixed on the mounting frame 17, and the other end of the feed pipe 3 is provided with a connecting pipe 25. The connecting pipe 25 is fixed on the mounting frame 17 on the other side. The connecting pipe 25 communicates with the buffer cylinder 30 on the side away from the steam inlet 10. The feed pipe 3 includes a fixed pipe 22 and an inner pipe 24. One end of the fixed pipe 22 communicates with the feed port 20, and through holes 23 are provided at the positions of the fixed pipe 22 corresponding to the fins 14.

[0039] By setting the feed pipe 3, the liquid material enters axially from the center in the form of droplets, and then atomizes radially and sweeps axially. The droplet-shaped liquid material scatters from the through hole 23 towards the pressure-bearing outer cylinder 1 and impacts on the fins 14 distributed in a circumferential array. The droplet-shaped liquid material impacts on the heated surface of the heat exchange tube 21, slides rapidly on the fins 14 in a film form, separates from the heated surface, impacts on the adjacent fins 14 again, and the residence time is in the millisecond level. Compared with the traditional continuous falling film evaporator (residence time in the order of seconds) and the full liquid large-capacity evaporator (residence time in the order of minutes), the time is several times shorter. Therefore, it has a better separation and uniform heating effect on heat-sensitive materials and improves the separation accuracy.

[0040] The heated steam is discharged from the exhaust port 12, and the liquefied raw material drips downward and is discharged from the discharge pipe 13.

[0041] Embodiment 2:

[0042] On the basis of Embodiment 1, in order to realize the bearing rotation installation of the rotating pipe 15, there is also a buffer cylinder 30 connected to one end of the rotating pipe 15. The outer wall of the rotating pipe 15 is rotationally sleeved on the inner walls at both ends of the pressure-bearing outer cylinder 1 through a rotating bearing 7. A bearing seat 5 is arranged in the middle of the rotating pipe 15. One end of the bearing seat 5 is hermetically pressed on the port of the pressure-bearing outer cylinder 1. The bearing seat 5 is rotatably connected to the rotating pipe 15. The end of the rotating pipe 15 is threadedly and rotatably connected to a stepped connecting pipe 31. The connecting pipe 31 is inserted into the mounting block 9, and the stepped surface of the connecting pipe 31 is clamped in the inner cavity of the mounting block 9. The connecting pipe 31 connects the mounting block 9 and the rotating pipe 15.

[0043] By setting the bearing seat 5 and the rotating bearing 7, the bearing rotation and sealing connection between the rotating pipe 15 and the pressure-bearing outer cylinder 1 are realized.

[0044] Embodiment 3:

[0045] On the basis of Embodiment 2, in order to reduce the influence of temperature on the bearing and provide stable rotation, there is also a lubrication flow channel 16 arranged on the bearing seat 5. The lubrication flow channel 16 is externally connected to cooling water, and the lubrication flow channel 16 communicates with the inner cavity of the bearing seat 5 and the rotating bearing 7.

[0046] By setting the lubrication flow channel 16, the bearing assembly is cooled and lubricated.

[0047] Embodiment 4:

[0048] On the basis of Embodiment 1, in order to realize the rotation drive of the rotating pipe 15, there is also a sprocket 19 fixedly sleeved on the outer wall of the middle section of the rotating pipe 15. The sprocket 19 meshes with a gear driven by an external motor.

[0049] By setting the meshing connection between the sprocket 19 and the gear, the rotating tube 15 is driven to rotate, achieving the purpose of centrifugal rotation separation.

[0050] Embodiment 5:

[0051] On the basis of Embodiment 3, in order to seal both ends of the rotating tube 15 and prevent steam from leaking, a pair of sealing end plates 6 are provided on a pair of symmetrically arranged fixing brackets 11. The sealing end plates 6 are hermetically inserted into the inner cavity of the mounting block 9, and the sealing end plates 6 are fixedly connected to the mounting block 9 by screws.

[0052] The sealing of both ends of the rotating tube 15 is achieved through the sealing end plates 6, preventing scalding caused by steam leakage.

[0053] Embodiment 6:

[0054] On the basis of Embodiment 2, in order to achieve the uniform distribution of steam in multiple heat exchange tubes 21, a pair of distribution plates 18 are vertically arranged between a pair of symmetrically arranged buffer cylinders 30. Both ends of the heat exchange tubes 21 are fixed in the distribution plates 18, and both ends of the heat exchange tubes 21 communicate with the buffer cylinders 30. The feed pipe 3 rotatably penetrates through the distribution plates 18, and sealing bearing blocks 8 are provided at the connection positions of the feed pipe 3 and a pair of symmetrically arranged distribution plates 18. A right-angle pipe 29 is provided at the end of the feed pipe 3, and the right-angle pipe 29 is fixed on the mounting frame 17. The right-angle pipe 29 communicates with the fixed pipe 22 and the feed port 20.

[0055] By setting the cooperation of the buffer cylinders 30 and the distribution plates 18, steam is accumulated in the buffer cylinders 30 and uniformly filled into the heat exchange tubes 21, achieving the purpose of uniform heating. The through-sealing insertion of the feed pipe 3 is realized by setting the sealing bearing blocks 8.

[0056] Embodiment 7:

[0057] On the basis of Embodiment 6, in order to drain the steam after heat exchange and liquefaction, the sealing bearing block 8 is fixedly sleeved on the outer wall of the fixed pipe 22. The sealing bearing block 8 on the side close to the connecting pipe 25 is rotatably connected to the connecting pipe 25 by threads. A drain pipe 4 is vertically provided at the end of the connecting pipe 25. The middle section of the connecting pipe 25 penetrates through the rotating tube 15, and the end of the connecting pipe 25 is fixed on the right mounting frame 17. A sealing cover plate 26 is provided at the port of the connecting pipe 25, and the drain pipe 4 communicates with the buffer cylinder 30.

[0058] By setting the connection between the connecting pipe 25 and the drain pipe 4, the condensate water after the heating steam is liquefied is discharged.

[0059] Embodiment 8:

[0060] On the basis of Embodiment 1, in order to further improve the heating efficiency, arc-shaped end covers are provided at both ends of the pressure-bearing outer cylinder 1. The pressure-bearing outer cylinder 1 and the end covers are fixedly and hermetically connected through flange plates 27. The exhaust port 12 on the pressure-bearing outer cylinder 1 faces the outside of multiple groups of fins 14 distributed in a circumferential array, and the through hole 23 faces the inside of the fins 14. The fins 14 are arranged in a circular ring shape, and the outer wall of the fins 14 is provided with a wavy shape. The fins 14 are fixedly sleeved on the outer wall of the middle section of the heat exchange tube 21, and a gap is left between adjacent heat exchange tubes 21.

[0061] By setting the outer wall of the fins 14 to be wavy, the heat exchange area is further increased, thereby improving the heat exchange efficiency, reducing the contact time with the heating surface, and adapting to the heating and separation of heat-sensitive materials.

[0062] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Small temperature difference and low-temperature centrifugal film-forming evaporator, characterized in that: The evaporator includes: A pressure-bearing outer cylinder (1) with a base (28) provided at the lower end thereof, an exhaust port (12) provided at the upper end thereof, a discharge pipe (13) provided at the lower end thereof, a pair of fixing brackets (11) symmetrically provided on both sides of the pressure-bearing outer cylinder (1), and a mounting bracket (17) provided in parallel on the outer side of the fixing bracket (11); A heat exchanger (2) including a pair of symmetrically arranged left and right rotating pipes (15), a buffer cylinder (30), and heat exchange pipes (21). A pair of symmetrically arranged left and right buffer cylinders (30) are installed in the inner cavity of the pressure-bearing outer cylinder (1). A plurality of groups of parallel heat exchange pipes (21) distributed in a circumferential array are inserted between adjacent buffer cylinders (30). One end of the rotating pipe (15) communicates with the buffer cylinder (30), and the other end of the rotating pipe (15) is rotatably connected to a mounting block (9). A steam inlet port (10) communicating with the rotating pipe (15) is vertically provided on the mounting block (9). The mounting block (9) is rotatably installed on the fixing bracket (11). A plurality of circular fins (14) are provided on the outer wall of the heat exchange pipe (21); A feed pipe (3) is inserted through the heat exchanger (2). One end of the feed pipe (3) is fixed to the mounting bracket (17), and the other end of the feed pipe (3) is provided with a connecting pipe (25). The connecting pipe (25) is fixed to the mounting bracket (17) on the other side. The connecting pipe (25) communicates with the buffer cylinder (30) on the side away from the steam inlet port (10). The feed pipe (3) includes a fixed pipe (22) and an inner pipe (24). One end of the fixed pipe (22) communicates with the feed port (20). Through holes (23) are provided at positions corresponding to the fins (14) on the fixed pipe (22). One end of the rotating pipe (15) communicates with the buffer cylinder (30). The outer wall of the rotating pipe (15) is rotatably sleeved on the inner walls at both ends of the pressure-bearing outer cylinder (1) through a rotating bearing (7). A bearing seat (5) is provided in the middle of the rotating pipe (15). One end of the bearing seat (5) is hermetically pressed on the port of the pressure-bearing outer cylinder (1). The bearing seat (5) is rotatably connected to the rotating pipe (15). A pair of evenly distributed plates (18) are vertically provided between the pair of symmetrically arranged left and right buffer cylinders (30). Both ends of the heat exchange pipe (21) are fixed in the evenly distributed plates (18), and both ends of the heat exchange pipe (21) communicate with the buffer cylinder (30). The feed pipe (3) rotatably penetrates through the evenly distributed plates (18), and sealing bearing blocks (8) are provided at the connection positions of the feed pipe (3) and the pair of symmetrically arranged left and right evenly distributed plates (18). A right-angle pipe (29) is provided at the end of the feed pipe (3). The right-angle pipe (29) is fixed to the mounting bracket (17). The right-angle pipe (29) communicates with the fixed pipe (22) and the feed port (20).

2. The small temperature difference low-temperature centrifugal film-forming evaporator according to claim 1, wherein: A stepped connecting clamping pipe (31) is threadedly rotatably connected to the end of the rotating pipe (15). The connecting clamping pipe (31) is inserted into the mounting block (9), and the stepped surface of the connecting clamping pipe (31) is clamped in the inner cavity of the mounting block (9). The connecting clamping pipe (31) communicates with the mounting block (9) and the rotating pipe (15).

3. The small temperature difference and low-temperature centrifugal film-forming evaporator according to claim 2, wherein: Sealing end plates (6) are provided on a pair of left-right symmetric fixing brackets (11). The sealing end plates (6) are hermetically inserted into the inner cavity of the mounting blocks (9), and the sealing end plates (6) are fixedly connected to the mounting blocks (9) by screws.

4. The small temperature difference and low temperature centrifugal film-forming evaporator according to claim 1, wherein: A sprocket (19) is fixedly sleeved on the outer wall of the middle section of the rotating pipe (15), and the sprocket (19) meshes with a gear driven by an external motor.

5. The small temperature difference low-temperature centrifugal film-forming evaporator according to claim 1, characterized in that: A lubricating flow channel (16) is provided on the bearing seat (5). The lubricating flow channel (16) is externally connected to cooling water, and the lubricating flow channel (16) communicates with the inner cavity of the bearing seat (5) and the rotating bearing (7).

6. The small temperature difference low-temperature centrifugal film-forming evaporator according to claim 1, characterized in that: The sealed bearing block (8) is fixedly sleeved on the outer wall of the fixed pipe (22). The sealed bearing block (8) on the side close to the connecting pipe (25) is rotationally connected to the connecting pipe (25) by threads. A drain pipe (4) is vertically arranged at the end of the connecting pipe (25). The middle section of the connecting pipe (25) penetrates through the rotating pipe (15), and the end of the connecting pipe (25) is fixed on the right mounting frame (17). A sealing cover plate (26) is arranged at the port of the connecting pipe (25), and the drain pipe (4) communicates with the buffer cylinder (30).

7. The small temperature difference and low temperature centrifugal film-forming evaporator according to claim 1, characterized in that: Arc-shaped end covers are provided at both ends of the pressure-bearing outer cylinder (1). The pressure-bearing outer cylinder (1) is fixedly and hermetically connected to the end covers through flange plates (27). The exhaust ports (12) on the pressure-bearing outer cylinder (1) face the outside of a plurality of groups of fins (14) distributed in a circumferential array, and the through holes (23) face the inside of the fins (14).

8. The small temperature difference low-temperature centrifugal film-forming evaporator according to claim 7, wherein: The fins (14) are circular ring-shaped, and the outer wall of the fins (14) is wavy. The fins (14) are fixedly sleeved on the outer wall of the middle section of the heat exchange pipe (21), and a gap is left between adjacent heat exchange pipes (21).

Images