A concentrated crystallization evaporator

Abstract

The present invention relates to the technical field of evaporators, and specifically discloses a concentrating crystallization evaporator, including a compressor, a falling film evaporator and a feed preheater, wherein the upper end of the falling film evaporator and the upper end of the feed preheater are connected through an upper circulation pipeline, and the lower end of the falling film evaporator and the lower end of the feed preheater are connected through a lower circulation pipeline; a plug flow agitator is arranged on the lower circulation pipeline, and the two ends of the compressor are respectively connected to the upper circulation pipeline and the falling film evaporator, and a condensate inlet and a condensate outlet are arranged on the side wall of the feed preheater, and the condensate inlet is located above the condensate outlet; the falling film evaporator includes an evaporation shell, an evaporation component, a water distribution component and an anti-blocking component, and the evaporation component, the water distribution component and the anti-blocking component are all located inside the evaporation shell. The present invention can increase the contact area between the crystallization liquid and the heating tubes, increase the vortex flow capacity of the steam passing path, and fully realize the heat exchange capacity between the steam and the heating tubes.

Description

Technical Field

[0001] The invention relates to the technical field of evaporators, and in particular to a concentration and crystallization evaporator. Background Art

[0002] Concentration and crystallization evaporator is a device that uses the principles of evaporation and crystallization to increase the solute concentration in the solution by lowering the evaporation temperature of the material or increasing the evaporation area. According to different design and application requirements, concentration and crystallization evaporators can be divided into many types, including low-temperature multi-effect plate evaporators, mechanical vapor recompression evaporators, forced circulation vacuum concentrators, etc.

[0003] At present, the existing technology still has the following areas for improvement: the space utilization of existing concentration and crystallization evaporators is usually not maximized, and the equipment volume utilization is not maximized; the steam heat exchange efficiency is insufficient, the circulation power consumption is large, and the heating heat energy consumption is large; the mechanical equipment runs continuously under high temperature conditions for a long time, and the equipment is frequently inspected and maintained; the processing functional units are diverse, the operation and control are complex, and the degree of integration is insufficient. Summary of the invention

[0004] In order to solve the above problems existing in the prior art, the present invention provides a concentrating crystallization evaporator, which can increase the contact area between the crystallization liquid and the heating tubes, increase the vortex flow capacity of the steam passing path, and fully realize the heat exchange capacity between the steam and the heating tubes.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A concentration crystallization evaporator comprises a compressor, a falling film evaporator and a feed preheater, wherein the upper end of the falling film evaporator and the upper end of the feed preheater are connected through an upper circulation pipeline, and the lower end of the falling film evaporator and the lower end of the feed preheater are connected through a lower circulation pipeline;

[0007] The lower circulation pipeline is provided with a plug flow agitator, the two ends of the compressor are respectively connected to the upper circulation pipeline and the falling film evaporator, and the side wall of the feed preheater is provided with a condensate inlet and a condensate outlet, and the condensate inlet is located above the condensate outlet;

[0008] The falling film evaporator comprises an evaporation shell, an evaporation component, a water distribution component and an anti-blocking component, wherein the evaporation component, the water distribution component and the anti-blocking component are all located inside the evaporation shell, the water distribution component is located above the evaporation component, and the anti-blocking component is located below the evaporation component;

[0009] The evaporation assembly includes an upper support plate, a lower support plate, twelve steam guide baffles and seven heating tubes, the seven heating tubes are arranged crosswise in a triangle, the upper support plate is located above the seven heating tubes, and the lower support plate is located below the seven heating tubes;

[0010] The upper support plate and the lower support plate are both fixedly connected to the inside of the evaporation shell, and the upper support plate and the lower support plate are each provided with seven through holes, and the fourteen through holes correspond to the upper and lower ends of the seven heating tubes;

[0011] Four of the steam guide baffles form a row, three rows of the steam guide baffles are evenly distributed between the seven heating tubes, and each of the steam guide baffles is symmetrically arranged with the steam guide baffle below it.

[0012] Furthermore, the seven heating tubes are all in the shape of hexagonal petals, and the twelve steam guide baffles are all in the shape of a Z-shaped structure.

[0013] Furthermore, a heating layer is fixedly arranged on the inner wall of the evaporation shell.

[0014] Furthermore, the water distribution assembly includes a water distribution tray and five drainage pieces. The five drainage pieces are evenly and fixedly connected to the inside of the water distribution tray. The five drainage pieces are all arc-shaped structures.

[0015] Furthermore, the water distribution tray is located above the upper support plate, and the water distribution tray is fixedly connected to the inside of the evaporation shell.

[0016] Furthermore, the anti-blocking component includes a gear plate, a rotating plate, a driving gear, a driven bevel gear and a driving bevel gear, the rotating plate is fixedly connected to the inside of the gear plate, the driving gear is meshed with the gear plate, a rotating shaft is fixedly provided on the driving gear, the driven bevel gear is sleeved on the rotating shaft, the driven bevel gear is meshed with the driving bevel gear, and the driving bevel gear is fixedly provided with a driving shaft.

[0017] Furthermore, the gear plate is located between the lower support plate and the evaporation shell, a driving motor is fixedly provided at one end of the driving shaft, and three anti-blocking parts are evenly fixedly provided inside the gear plate, and the three anti-blocking parts are all triangular structures.

[0018] Furthermore, the driving motor is fixedly connected to the evaporation shell via a motor fixing block, and the driving gear and the rotating shaft are connected via a connecting key.

[0019] The beneficial effects of the present invention are:

[0020] (1) By setting up the evaporation assembly, the technical effect that can be achieved is that the seven heating tubes are arranged in a triangular cross pattern, the upper support plate is located above the seven heating tubes, the lower support plate is located below the seven heating tubes, the fourteen through holes correspond to the upper and lower ends of the seven heating tubes, four steam guide baffles are in one row, three rows of steam guide baffles are evenly distributed between the seven heating tubes, each steam guide baffle is symmetrically arranged with the steam guide baffle below it, the seven heating tubes are all hexagonal petal-shaped, the twelve steam guide baffles are all Z-shaped structures, and a heating layer is fixedly arranged on the inner wall of the evaporation shell;

[0021] The compressor delivers steam to the evaporator shell, the heating layer heats the steam, the steam passes through the steam guide baffle, is heated and concentrated by the heating tubes, and then moves to the lower support plate. The hexagonal petal-shaped heating tubes can increase the contact area between the crystallization liquid and the heating tubes. The Z-shaped steam guide baffle increases the vortex flow capacity of the steam path, fully realizing the heat exchange capacity between the steam and the heating tubes.

[0022] (2) By setting up a water distribution assembly, the technical effect that can be achieved is that five drainage pieces are evenly fixedly connected to the inside of the water distribution tray. The five drainage pieces are all arc-shaped structures. The water distribution tray is located above the upper support plate. The water distribution tray is fixedly connected to the inside of the evaporation shell. The crystallization liquid flows into the upper support plate after being drained through the drainage pieces. The water distribution assembly can drain the crystallization liquid to prevent the crystallization liquid from accumulating on the upper support plate and clogging the upper support plate, preventing it from flowing into the heating tube array, and also preventing the crystallization liquid from splashing out.

[0023] (3) By setting the anti-blocking component, the technical effect that can be achieved is that the rotating disk is fixedly connected to the inside of the gear disk, the driving gear and the gear disk are meshed, the driving gear is fixedly provided with a rotating shaft, the driven bevel gear is sleeved on the rotating shaft, the driven bevel gear and the active bevel gear are meshed, the active bevel gear is fixedly provided with a driving shaft, the gear disk is located between the lower support plate and the evaporation shell, a driving motor is fixedly provided at one end of the driving shaft, and three anti-blocking parts are evenly fixedly provided inside the gear disk, and the three anti-blocking parts are all triangular structures;

[0024] Start the drive motor to drive the drive shaft to rotate, the active bevel gear drives the driven bevel gear to rotate, drives the rotating shaft to rotate, the drive gear drives the gear plate to rotate, the rotating plate drives the three anti-blocking parts to rotate, and the crystallization liquid moves to the lower circulation pipeline through the lower support plate. The anti-blocking component can prevent the crystallization liquid from accumulating and clogging on the lower support plate, slow down the flow rate of the crystallization liquid, increase the concentration time of the crystallization liquid, avoid damage to parts caused by clogging of the crystallization liquid, and increase the service life of the equipment.

[0025] (4) By providing an upper circulation pipeline, a falling film evaporator, a lower circulation pipeline and a feed preheater, the technical effect that can be achieved is that the upper end of the falling film evaporator and the upper end of the feed preheater are connected through the upper circulation pipeline, the lower end of the falling film evaporator and the lower end of the feed preheater are connected through the lower circulation pipeline, a plug flow agitator is provided on the lower circulation pipeline, both ends of the compressor are connected to the upper circulation pipeline and the falling film evaporator respectively, and a condensate inlet and a condensate outlet are provided on the side wall of the feed preheater, and the condensate inlet is located above the condensate outlet;

[0026] The crystallization liquid enters the falling film evaporator from the condensate inlet, enters the upper circulation pipeline after preliminary heating in the feed preheater, and the crystallization liquid enters the feed preheater. The feed preheater and the falling film evaporator realize an O-type circulation evaporation system, achieving more efficient and sufficient evaporation mass transfer efficiency, reducing heat energy consumption, simplifying equipment integration, and reducing control points and inspection and maintenance frequency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0028] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 It is a front cross-sectional view of the falling film evaporator in the present invention;

[0030] Figure 3 is a top sectional view of the falling film evaporator of the present invention;

[0031] Figure 4 A top view of the heating tubes in the present invention;

[0032] Figure 5 It is a structural schematic diagram of the steam guide baffle in the present invention;

[0033] Figure 6 A top view of the water distribution tray of the present invention;

[0034] Figure 7 A bottom view of the water distribution tray of the present invention;

[0035] Figure 8 It is a front cross-sectional view of the anti-blocking component in the present invention;

[0036] Fig. 9 A top view of the gear plate and the driving gear in the present invention;

[0037] Description of main component symbols:

[0038] In the figure: 1. condensate inlet; 2. upper circulation pipeline; 3. compressor; 4. falling film evaporator; 5. lower circulation pipeline; 6. plug flow agitator; 7. condensate outlet; 8. feed preheater;

[0039] 41. Evaporation shell; 42. Upper support plate; 43. Steam guide baffle; 44. Heating tubes; 45. Driving motor; 46. Rotating plate; 47. Lower support plate; 48. Heating layer; 49. Water distribution tray; 410. Drainage piece; 411. Driving gear; 412. Rotating shaft; 413. Driving shaft; 414. Driven bevel gear; 415. Active bevel gear; 416. Motor fixing block; 417. Anti-blocking piece; 418. Gear plate; 419. Connecting key. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application; obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application without making creative work are within the scope of protection of the present application.

[0041] In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0042] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "set / connected", "connected", etc. should be understood in a broad sense. For example, "connected" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0043] Reference Figures 1 to 9 , is a concentrating crystallization evaporator disclosed in the present invention, comprising a compressor 3, a falling film evaporator 4 and a feed preheater 8, the upper end of the falling film evaporator 4 and the upper end of the feed preheater 8 are connected through an upper circulation pipe 2, and the lower end of the falling film evaporator 4 and the lower end of the feed preheater 8 are connected through a lower circulation pipe 5.

[0044] A plug flow agitator 6 is provided on the lower circulation pipeline 5, two ends of the compressor 3 are respectively connected to the upper circulation pipeline 2 and the falling film evaporator 4, and a condensate inlet 1 and a condensate outlet 7 are provided on the side wall of the feed preheater 8, and the condensate inlet 1 is located above the condensate outlet 7.

[0045] The feed preheater 8 and the feed preheater 8 realize an O-type cycle evaporation system, achieving more efficient and sufficient evaporation mass transfer efficiency, reducing heat energy consumption, simplifying equipment integration, and reducing control points and inspection and maintenance frequency.

[0046] The falling film evaporator 4 includes an evaporation shell 41, an evaporation component, a water distribution component and an anti-blocking component. The evaporation component, the water distribution component and the anti-blocking component are all located inside the evaporation shell 41, the water distribution component is located above the evaporation component, and the anti-blocking component is located below the evaporation component.

[0047] The evaporation assembly includes an upper support plate 42, a lower support plate 47, twelve steam guide baffles 43 and seven heating tubes 44. The seven heating tubes 44 are arranged in a triangular cross pattern. The upper support plate 42 is located above the seven heating tubes 44, and the lower support plate 47 is located below the seven heating tubes 44.

[0048] The upper support plate 42 and the lower support plate 47 are both fixedly connected to the inside of the evaporation shell 41 . Seven through holes are formed on the upper support plate 42 and the lower support plate 47 . The fourteen through holes correspond to the upper and lower ends of the seven heating tube arrays 44 .

[0049] Four steam guide baffles 43 form a row, and three rows of steam guide baffles 43 are evenly distributed among the seven heating tubes 44. Each steam guide baffle 43 is symmetrically arranged with the steam guide baffle 43 below it.

[0050] The seven heating tubes 44 are all in the shape of hexagonal petals, the twelve steam guide baffles 43 are all in a Z-shaped structure, and a heating layer 48 is fixedly provided on the inner wall of the evaporation shell 41 .

[0051] The hexagonal petal-shaped heating tubes 44 can increase the contact area between the crystallization liquid and the heating tubes 44 , and the Z-shaped steam guide baffle 43 increases the vortex flow capacity of the steam passing path, thereby fully realizing the heat exchange capacity between the steam and the heating tubes 44 .

[0052] The water distribution assembly includes a water distribution tray 49 and five drainage members 410. The five drainage members 410 are evenly fixedly connected to the inside of the water distribution tray 49. The five drainage members 410 are all arc-shaped structures.

[0053] The water distribution tray 49 is located above the upper support plate 42, and the water distribution tray 49 is fixedly connected to the inside of the evaporation shell 41. The water distribution assembly can drain the crystal liquid to prevent the crystal liquid from accumulating on the upper support plate 42 and blocking the upper support plate 42, and preventing it from flowing into the heating tube array 44, and also preventing the crystal liquid from splashing out.

[0054] The anti-blocking component includes a gear plate 418, a rotating plate 46, a driving gear 411, a driven bevel gear 414 and a driving bevel gear 415. The rotating plate 46 is fixedly connected to the inside of the gear plate 418, the driving gear 411 and the gear plate 418 are meshed, a rotating shaft 412 is fixedly provided on the driving gear 411, the driven bevel gear 414 is sleeved on the rotating shaft 412, the driven bevel gear 414 and the driving bevel gear 415 are meshed, and a driving shaft 413 is fixedly provided on the driving bevel gear 415.

[0055] The gear plate 418 is located between the lower support plate 47 and the evaporation shell 41 , a driving motor 45 is fixedly provided at one end of the driving shaft 413 , and three anti-blocking members 417 are evenly fixedly provided inside the gear plate 418 , and the three anti-blocking members 417 are all triangular structures.

[0056] The driving motor 45 is fixedly connected to the evaporation shell 41 through the motor fixing block 416, and the driving gear 411 and the rotating shaft 412 are connected through the connecting key 419. The anti-blocking component can prevent the crystallization liquid from accumulating and blocking on the lower support plate 47, slow down the flow rate of the crystallization liquid, increase the concentration time of the crystallization liquid, avoid the damage of parts caused by the blockage of the crystallization liquid, and increase the service life of the equipment.

[0057] The working principle and use process of the present invention are as follows: the crystal liquid enters the feed preheater 8 from the condensate inlet 1, enters the upper circulation pipeline 2 after being preliminarily heated in the feed preheater 8, and enters the falling film evaporator 4;

[0058] The compressor 3 delivers steam to the evaporation shell 41, the heating layer 48 heats the steam, the steam passes through the steam guide baffle 43, the crystal liquid is guided by the guide member 410 and flows into the upper support plate 42, and then is heated and concentrated by the heating tubes 44, and then moves to the lower support plate 47;

[0059] Start the driving motor 45 to drive the driving shaft 413 to rotate, the active bevel gear 415 drives the driven bevel gear 414 to rotate, drives the rotating shaft 412 to rotate, the driving gear 411 drives the gear plate 418 to rotate, the rotating plate 46 drives the three anti-blocking parts 417 to rotate, and the crystal liquid moves to the lower circulation pipeline 5 through the lower support plate 47;

[0060] After being stirred by the plug flow stirrer 6, the crystal liquid moves to the condensate outlet 7 of the feed preheater 8 and flows out, thereby completing the concentration of the crystal liquid.

[0061] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A concentrating crystallization evaporator, characterized in that: It comprises a compressor (3), a falling film evaporator (4) and a feed preheater (8), wherein the upper end of the falling film evaporator (4) and the upper end of the feed preheater (8) are connected via an upper circulation pipeline (2), and the lower end of the falling film evaporator (4) and the lower end of the feed preheater (8) are connected via a lower circulation pipeline (5); The lower circulation pipeline (5) is provided with a plug flow agitator (6), the two ends of the compressor (3) are respectively connected to the upper circulation pipeline (2) and the falling film evaporator (4), and the side wall of the feed preheater (8) is provided with a condensate inlet (1) and a condensate outlet (7), and the condensate inlet (1) is located above the condensate outlet (7); The falling film evaporator (4) comprises an evaporation shell (41), an evaporation component, a water distribution component and an anti-blocking component, wherein the evaporation component, the water distribution component and the anti-blocking component are all located inside the evaporation shell (41), the water distribution component is located above the evaporation component, and the anti-blocking component is located below the evaporation component; The evaporation assembly comprises an upper support plate (42), a lower support plate (47), twelve steam guide baffles (43) and seven heating tubes (44), wherein the seven heating tubes (44) are arranged crosswise in a triangle, the upper support plate (42) is located above the seven heating tubes (44), and the lower support plate (47) is located below the seven heating tubes (44); The upper support plate (42) and the lower support plate (47) are both fixedly connected to the inside of the evaporation shell (41); the upper support plate (42) and the lower support plate (47) are each provided with seven through holes, and the fourteen through holes correspond to the upper and lower ends of the seven heating tube arrays (44); The four steam guide baffles (43) form a row, the three rows of steam guide baffles (43) are evenly distributed between the seven heating tubes (44), and each steam guide baffle (43) is symmetrically arranged with the steam guide baffle (43) below it; The seven heating tubes (44) are all in the shape of hexagonal petals, and the twelve steam guide baffles (43) are all in the shape of a Z-shaped structure; The anti-blocking component comprises a gear plate (418), a rotating plate (46), a driving gear (411), a driven bevel gear (414) and a driving bevel gear (415); the rotating plate (46) is fixedly connected to the inside of the gear plate (418); the driving gear (411) and the gear plate (418) are meshed with each other; a rotating shaft (412) is fixedly arranged on the driving gear (411); the driven bevel gear (414) is sleeved on the rotating shaft (412); the driven bevel gear (414) and the driving bevel gear (415) are meshed with each other; and a driving shaft (413) is fixedly arranged on the driving bevel gear (415).

2. A concentrating and crystallizing evaporator according to claim 1, characterized in that: A heating layer (48) is fixedly arranged on the inner wall of the evaporation shell (41).

3. A concentrating and crystallizing evaporator according to claim 1, characterized in that: The water distribution assembly comprises a water distribution tray (49) and five drainage pieces (410), wherein the five drainage pieces (410) are evenly and fixedly connected inside the water distribution tray (49), and the five drainage pieces (410) are all of arc-shaped structures.

4. A concentrating and crystallizing evaporator according to claim 3, characterized in that: The water distribution tray (49) is located above the upper support plate (42), and the water distribution tray (49) is fixedly connected to the inside of the evaporation shell (41).

5. A concentrating and crystallizing evaporator according to claim 1, characterized in that: The gear plate (418) is located between the lower support plate (47) and the evaporation shell (41), a drive motor (45) is fixedly arranged at one end of the drive shaft (413), and three anti-blocking parts (417) are evenly fixedly arranged inside the gear plate (418), and the three anti-blocking parts (417) are all triangular structures.

6. A concentrating crystallization evaporator according to claim 5, characterized in that: The driving motor (45) is fixedly connected to the evaporation shell (41) via a motor fixing block (416), and the driving gear (411) and the rotating shaft (412) are connected via a connecting key (419).

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