Anti-scaling enhanced heat transfer system of MVR (mechanical vapor recompression) evaporator

Abstract

The invention relates to the technical field of MVR (mechanical vapor recompression) evaporators, in particular to an anti-scaling enhanced heat transfer system of an MVR evaporator, which comprises an evaporator, a separator in pipeline communication with the evaporator and a compressor in pipeline communication with the separator, and the compressor and the output end of the evaporator are in pipeline communication with the evaporator; wherein the evaporator comprises a shell, an upper plate and a lower plate, the upper plate and the lower plate are rotationally connected into the shell, the multiple heat exchange pipes are connected in an overall rotating mode, steam is input into the shell through the compressor, an input port is formed in one side of the shell, and therefore the heat exchange pipes can be installed in a traditional fixed heat exchange pipe installation mode, and the heat exchange pipes can be installed more conveniently. Compared with the prior art, the heating uniformity of the heat exchange tube is general, and the heating uniformity of the heat exchange tube can be improved by adopting the mode that the heat exchange tube rotates circumferentially as a whole in the scheme, so that the heat transfer effect is enhanced; in addition, the arranged cleaning assembly can be used for flushing the heat exchange pipe, and therefore the durability and reliability of the whole device are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of MVR evaporator, and particularly relates to an anti-fouling and heat transfer strengthening system of MVR evaporator. BACKGROUND

[0002] MVR (mechanical vapor recompression) evaporator, as a kind of high-efficiency and energy-saving evaporation and concentration equipment, has been widely used in chemical industry, food industry, pharmaceutical industry and environmental protection industry. The core of the MVR evaporator is to recycle the latent heat of secondary steam through a compressor to realize the recycling of energy. However, in actual operation, the heat exchange efficiency and the operation stability of the MVR evaporator are the key factors restricting its performance.

[0003] At present, the traditional MVR evaporator generally adopts a fixed tube bundle heat exchange structure. In such a structure, high-temperature steam is usually introduced from the inlet on one side of the shell, which makes the distribution of the steam in the shell difficult to be absolutely uniform, which causes the problem of uneven heating of the fixedly installed heat exchange tube bundle, and the temperature of some areas is too high, while the heat transfer of other areas is insufficient, which not only limits the overall heat transfer efficiency, but also accelerates the fouling and crystallization of the material liquid on the pipe wall due to local overheating; the fouling layer on the inner wall of the heat exchange tube forms a large thermal resistance, which seriously weakens the heat transfer effect, forces the system to frequently stop for chemical or mechanical cleaning, greatly increases the operation and maintenance cost, and reduces the continuity and reliability of the equipment operation.

[0004] Therefore, how to effectively strengthen the heat transfer performance of the heat exchange tube and realize the convenient cleaning of the heat exchange tube to prevent the structure is an important technical problem to be solved. SUMMARY

[0005] The present application aims at solving the above-mentioned shortcomings in the prior art and provides an anti-fouling and heat transfer strengthening system of MVR evaporator.

[0006] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme: An anti-fouling and heat transfer strengthening system of MVR evaporator is designed, which comprises: an evaporator, a separator in communication with an evaporator pipeline, and a compressor in communication with the separator pipeline, wherein the compressor is in communication with the output end of the evaporator and the evaporator pipeline; The evaporator comprises a shell, an upper plate and a lower plate rotatably connected inside the shell, a plurality of heat exchange tubes circumferentially distributed between the upper plate and the lower plate, a driving member arranged on the outer side of the shell for driving the lower plate to rotate, and a cleaning assembly arranged above the shell.

[0007] Further, a gear ring is fixedly installed at the bottom end of the lower plate. A bevel gear is fixedly installed at the shaft end of the driving member, and the bevel gear is in meshing transmission with the gear ring.

[0008] Further, the cleaning assembly comprises a fixing frame fixedly installed outside the shell, a sleeve is fixedly installed inside the fixing frame, and a water pipe joint is fixedly installed at one end of the sleeve; The inside of the sleeve movably inserts a water spraying pipe, and a water spraying hole is formed in the bottom of the water spraying pipe.

[0009] Further, a piston is fixedly installed at the end of the water spraying pipe, an end cover is threadedly connected to the end of the sleeve, a spring is arranged between the end cover and the piston, and the water spraying pipe and the end cover are movably inserted.

[0010] Further, a scraper assembly and a stirring assembly are further included, and the scraper assembly and the stirring assembly are installed in the shell, and a one-way transmission structure is arranged between the scraper assembly and the stirring assembly.

[0011] Further, the stirring assembly comprises at least two fixed rods fixedly installed at the bottom of the lower plate, a cross rod is fixedly connected to the bottom of the fixed rod, a rotating shaft is fixedly installed at the middle of the cross rod, and stirring blades are fixedly installed at both ends of the rotating shaft.

[0012] Further, the scraper assembly comprises a scraper frame rotatably connected to the outside of the rotating shaft, and scraper blades are fixedly installed on the side edges of the shell.

[0013] Further, the one-way transmission structure comprises a stop rod movably inserted on the fixed rod, and a tension spring is fixedly connected between the stop rod and the fixed rod. The two sides of the scraper frame are provided with inclined grooves, and the bottom of the stop rod is guided to move by the inclined grooves.

[0014] Further, a shielding ring is formed at the upper end of the upper plate, and the shielding ring is located below the feeding port of the shell.

[0015] Further, two positioning plates are fixedly installed inside the shell, and the upper plate and the lower plate are rotatably connected to the two sides of the two positioning plates, respectively.

[0016] The beneficial effect of the anti-fouling heat transfer strengthening system of the MVR evaporator lies in: in the application, a plurality of heat exchange pipes are connected in a whole rotating manner, the steam is input into the shell by the compressor, and the input port is on one side of the shell, therefore, the installation mode of the traditional fixed heat exchange pipe is generally uniform in heating, the heat exchange pipe in the whole circumferential rotating mode can improve the heating uniformity of the heat exchange pipe, so that the problem of strengthening the heat transfer effect is solved, and in addition, the cleaning assembly can be used for flushing the heat exchange pipe to avoid internal fouling, so that the durability and reliability of the whole device are improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a perspective view of the application; Figure 2 It is a sectional view of the application; Figure 3 It is a schematic view of the upper plate structure of the application; Figure 4 It is a schematic view of the cleaning assembly structure of the application; Figure 5 It is a sectional view of the cleaning assembly of the application; Figure 6 It is a schematic view of the stirring assembly structure of the application; Figure 7 It is a schematic view of the scraper assembly structure of the application; Figure 8 It is a schematic view of the one-way transmission structure of the application.

[0018] In the figure: 1, evaporator; 10, shell; 11, upper plate; 12, lower plate; 13, heat exchange pipe; 14, driving piece; 15, gear ring; 16, bevel gear; 17, shielding ring; 18, positioning plate; 2, separator; 3, compressor; 4, cleaning assembly; 41, fixed frame; 42, sleeve; 43, water jet pipe; 44, piston; 45, end cover; 46, spring; 5, scraper assembly; 51, scraper frame; 52, scraper blade; 53, inclined slot; 6, stirring assembly; 61, fixed rod; 62, cross rod; 63, rotating shaft; 64, stirring blade; 7, one-way transmission structure; 71, stop rod; 72, tension spring. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, not all the embodiments.

[0020] Reference Figures 1-8For one embodiment of the present application, it discloses an anti-fouling enhanced heat transfer system of MVR evaporator, specifically the system comprises an evaporator 1, a separator 2 in pipeline communication with the evaporator 1, and a compressor 3 in pipeline communication with the separator 2, the compressor 3 and the output end of the evaporator 1 are in pipeline communication with the evaporator 1; Specifically, the evaporator 1 generates secondary steam during operation, which is separated by the separator 2, then compressed by the compressor 3 to increase its temperature and pressure, and then enters the evaporator 1 again as a heat source to heat the raw material, and the specific working principle is a conventional technical means for those skilled in the art, which will not be described here Among them, the evaporator 1 comprises a shell 10, an upper plate 11 and a lower plate 12 rotatably connected inside the shell 10, a plurality of heat exchange pipes 13 are circumferentially distributed between the upper plate 11 and the lower plate 12, a driving member 14 is arranged on the outside of the shell 10 for driving the lower plate 12 to rotate, and a cleaning assembly 4 is arranged above the shell 10.

[0021] That is, in the present application, the driving member 14 is used to drive the lower plate 12 to rotate, so as to drive the plurality of heat exchange pipes 13 and the upper plate 11 to rotate circumferentially. The reason for adopting this design is that the input port of the compressor 3 is on one side of the shell 10 when the steam is input into the shell 10. Therefore, the installation method of the conventional fixed heat exchange pipe 13 has general heating uniformity. The heat exchange pipe 13 in the present application rotates circumferentially as a whole, which can improve the heating uniformity of the heat exchange pipe 13, thereby achieving the problem of strengthening the heat transfer effect.

[0022] In some embodiments, a gear ring 15 is fixedly installed at the bottom end of the lower plate 12; a bevel gear 16 is fixedly installed at the shaft end of the driving member 14, and the bevel gear 16 and the gear ring 15 are in meshing transmission. Specifically, the driving member 14 in the present application is an electric motor, which is fixedly installed on the outside of the shell 10 and drives the gear ring 15 to rotate through the bevel gear 16, thereby achieving overall rotary control of the plurality of heat exchange pipes 13.

[0023] Further, the cleaning assembly 4 in the present embodiment comprises a fixed frame 41 fixedly installed on the outside of the shell 10, a sleeve 42 fixedly installed in the inside of the fixed frame 41, and a water pipe joint fixedly installed at one end of the sleeve 42. Among them, the inside of the sleeve 42 movably inserts a water spraying pipe 43, and the bottom of the water spraying pipe 43 is provided with a water spraying hole.

[0024] That is, in the present embodiment, the water spraying pipe 43 is movably inserted, which aims to store the water spraying pipe 43 in the inside of the sleeve 42 during normal evaporation process, so as to avoid interference of the water spraying pipe 43 with the falling material. It should be noted that, in the embodiment, since the plurality of heat exchange pipes 13 are arranged in a circumferential distribution manner, for example, three heat exchange pipes 13 are arranged on the radius path of the upper plate 11, the length of the water spraying pipe 43 in the embodiment can be equal to the radius length of the upper plate 11, and the bottom of the water spraying pipe 43 can also be provided with three water spraying holes, which correspond to the heat exchange pipes 13 one by one. In this way, when the plurality of heat exchange pipes 13 are rotated as a whole, the position of the water spraying pipe 43 can remain unchanged, and the plurality of heat exchange pipes 13 can be sequentially cleaned, and the structure is simple.

[0025] On the basis of the above embodiment, the piston 44 is fixedly installed at the end of the sleeve 42, the end cover 45 is threadedly connected to the end of the sleeve 42, the spring 46 is arranged between the end cover 45 and the piston 44, and the water spraying pipe 43 is movably inserted into the end cover 45.

[0026] That is, the spring 46 is arranged to reset the water spraying pipe 43 after cleaning. Specifically, when cleaning is needed, the water pipe joint on the sleeve 42 is first connected to an external water source. When water enters the inside of the sleeve 42, the water pressure moves the piston 44, the water spraying pipe 43 starts to move outward, and part of the water flows along the inner hole of the water spraying pipe 43 and is sprayed outward through the water spraying hole. When the cleaning operation is completed, the water pressure disappears, the piston 44 starts to move reversely and resets under the action of the spring 46, so that the entire water spraying pipe 43 is stored in the inside of the sleeve 42, so as to avoid the problem that the sleeve 42 is exposed outside and affects the falling of the material.

[0027] Preferably, the scraper assembly 5 and the stirring assembly 6 are further included in the embodiment, the scraper assembly 5 and the stirring assembly 6 are both installed in the housing 10, the one-way transmission structure 7 is arranged between the scraper assembly 5 and the stirring assembly 6, the scraper assembly 5 is used for scraping and cleaning the lower inner wall part of the housing 10, and the stirring assembly 6 is used for stirring the lower part of the housing 10. Since the material flows into the bottom of the housing 10 to form concentrated liquid after heat exchange through the heat exchange pipes 13 in the evaporation process, the stirring assembly 6 is arranged in the embodiment, which stirs the concentrated liquid, so as to improve the heat dissipation efficiency of the concentrated liquid, avoid heat accumulation in the inside, and improve the convenience of subsequent discharging of the concentrated liquid.

[0028] In some embodiments, the stirring assembly 6 comprises at least two fixed rods 61 fixedly installed at the bottom of the lower plate 12, a cross rod 62 is fixedly connected at the bottom of the fixed rod 61, a rotating shaft 63 is fixedly installed at the middle of the cross rod 62, and stirring blades 64 are fixedly installed at both ends of the rotating shaft 63.

[0029] That is, when the driving piece 14 drives the lower plate 12 to rotate, the two lower plates 12 also rotate synchronously to drive the rotating shaft 63 to rotate, and the two ends of the stirring blades 64 rotate synchronously when the rotating shaft 63 rotates, so as to stir the concentrated liquid at the bottom of the shell 10.

[0030] On the basis of the above-mentioned embodiments, the scraper assembly 5 in the present embodiment comprises a scraper frame 51 rotatably connected to the outside of the rotating shaft 63. The scraper frame 51 in the present embodiment has an H-shaped structure, and a fixed ring is connected to the upper end thereof. The scraper frame 51 is fixedly installed on the side edge of the shell 10, and a scraper 52 is fixedly installed on the inner wall of the shell 10. The scraper 52 can be made of high-temperature-resistant silica gel, which is attached to the inner wall of the shell 10 to scrape and clean the inner wall of the shell 10, so as to avoid the problem of adhesion of the concentrated liquid and subsequent fouling.

[0031] It should be noted that the one-way transmission structure 7 in the present embodiment comprises a stop rod 71 movably inserted into the fixed rod 61, and a tension spring 72 is fixedly connected between the stop rod 71 and the fixed rod 61. Among them, the inclined slot 53 is arranged on both sides of the scraper frame 51, and the bottom of the stop rod 71 is guided to move by the inclined slot 53.

[0032] Specifically, the driving direction of the driving piece 14 is opposite during the evaporation operation and the cleaning operation, that is, the rotating direction of the lower plate 12 is opposite. For example, when the entire lower plate 12 rotates in the forward direction during the evaporation operation, the stop rod 71 inserted into the end surface of the fixed rod 61 also moves when the fixed rod 61 rotates. When the stop rod 71 moves to the inclined slot 53 on the scraper frame 51, the stop rod 71 starts to retract under the guidance of the inclined slot 53 until it slides out of the inclined slot 53. The scraper 52 and the inner wall of the shell 10 are positioned by the friction force, that is, the stop rod 71 does not drive the scraper frame 51 at this time. When the cleaning operation, at this time the lower plate 12 reverse, that is, the fixed rod 61 reverse, because at this time the stop rod 71 reverse when the other end of the chute 53, its length is greater than the chute 53, therefore, the state of the stop rod 71 will be in contact with the whole scraper frame 51 synchronous rotation, that is, in the cleaning operation, the scraper frame 51 will also rotate synchronously, to achieve the inside of the shell 10 to scratch clean, to avoid the adhesion of the concentrate, and in the evaporation operation, the scraper frame 51 does not rotate, at this time only to the concentrate stirring can.

[0033] In some embodiments, the upper end of the upper plate 11 is shaped with a shielding ring 17, which is located below the inlet of the shell 10, and the shielding ring 17 is used to accumulate raw materials to prevent the raw materials from flowing out from the outside of the upper plate 11.

[0034] In addition, in order to realize the support of the upper plate 11 and the lower plate 12, two positioning plates 18 are fixedly installed inside the shell 10 in the embodiment, and the upper plate 11 and the lower plate 12 are respectively rotatably connected to the two sides of the two positioning plates 18. Of course, sealing rings or other sealing structures can be provided at the connection between the upper plate 11 and the lower plate 12 and the positioning plate 18 to realize sealing connection and reduce the possibility of high-temperature gas leakage. In summary, in the present application, by using the whole rotatable connection of the heat exchange pipe 13, the steam is input into the shell 10 by the compressor 3, and the input port is on one side of the shell 10. Therefore, the installation method of the traditional fixed heat exchange pipe 13 has general heating uniformity. The whole circumferential rotation of the heat exchange pipe 13 in the present application can improve the heating uniformity of the heat exchange pipe 13, thereby achieving the problem of strengthening the heat transfer effect. Secondly, the scraper assembly 5 is used to scrape and clean the lower inner wall of the shell 10, and the stirring assembly 6 is designed to stir the concentrate. This can improve the heat dissipation efficiency and avoid heat accumulation inside. In addition, the continuous stirring of the concentrate can also improve the convenience of subsequent discharge.

[0035] The above is only a preferred embodiment of the present application, but the protection scope of the present application is not limited thereto. Any skilled person in the art can make equivalent replacement or change according to the technical solution and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. An anti-fouling and enhanced heat transfer system for an MVR evaporator, characterized in that, include: An evaporator (1), a separator (2) connected to the evaporator (1) by a pipeline, and a compressor (3) connected to the separator (2) by a pipeline, wherein the output end of the compressor (3) and the evaporator (1) are connected to the evaporator (1) by a pipeline; The evaporator (1) includes a shell (10) and an upper plate (11) and a lower plate (12) rotatably connected inside the shell (10). A plurality of heat exchange tubes (13) are circumferentially distributed between the upper plate (11) and the lower plate (12). A driving member (14) for driving the lower plate (12) to rotate is provided on the outside of the shell (10). A cleaning component (4) is provided above the shell (10).

2. The anti-fouling enhanced heat transfer system for an MVR evaporator according to claim 1, characterized in that: A toothed ring (15) is fixedly installed at the bottom end of the lower plate (12); A bevel gear (16) is fixedly mounted on the shaft end of the drive component (14), and the bevel gear (16) and the gear ring (15) mesh and drive each other.

3. The anti-fouling enhanced heat transfer system for an MVR evaporator according to claim 1, characterized in that: The cleaning component (4) includes a fixing frame (41) fixedly installed on the outside of the housing (10), a sleeve (42) fixedly installed inside the fixing frame (41), and a water pipe connector fixedly installed at one end of the sleeve (42). The sleeve (42) is movably connected to a water spray pipe (43), and the bottom of the water spray pipe (43) is provided with a water spray hole.

4. The anti-fouling enhanced heat transfer system for an MVR evaporator according to claim 3, characterized in that: The water spray pipe (43) is fixedly installed with a piston (44) at the end of the sleeve (42). The end of the sleeve (42) is threadedly connected with an end cap (45). A spring (46) is placed between the end cap (45) and the piston (44). The water spray pipe (43) and the end cap (45) are movably inserted into each other.

5. The anti-fouling enhanced heat transfer system for an MVR evaporator according to claim 1, characterized in that: It also includes a scraper assembly (5) and a stirring assembly (6), both of which are installed in the housing (10), and a one-way transmission structure (7) is provided between the scraper assembly (5) and the stirring assembly (6).

6. The anti-fouling enhanced heat transfer system for an MVR evaporator according to claim 5, characterized in that: The stirring assembly (6) includes at least two fixed rods (61) fixedly installed at the bottom of the lower plate (12). A crossbar (62) is fixedly connected to the bottom of the fixed rod (61). A rotating shaft (63) is fixedly installed in the middle of the crossbar (62). Stirring blades (64) are fixed at both ends of the rotating shaft (63).

7. The anti-fouling enhanced heat transfer system for an MVR evaporator according to claim 6, characterized in that: The scraper assembly (5) includes a scraper frame (51) rotatably connected to the outside of the rotating shaft (63), and a scraper blade (52) is fixedly installed on the side of the housing (10) of the scraper frame (51).

8. The anti-fouling enhanced heat transfer system for an MVR evaporator according to claim 7, characterized in that: The one-way transmission structure (7) includes a stop rod (71) that is movably inserted into the fixed rod (61), and a tension spring (72) is fixedly connected between the stop rod (71) and the fixed rod (61). The scraper frame (51) has inclined grooves (53) on both sides, and the bottom of the stop bar (71) is guided to move by the inclined grooves (53).

9. The anti-fouling enhanced heat transfer system for an MVR evaporator according to claim 1, characterized in that: The upper edge of the upper plate (11) is formed with a shielding ring (17), which is located below the feed port of the housing (10).

10. An anti-fouling enhanced heat transfer system for an MVR evaporator according to any one of claims 1-9, characterized in that: Two positioning plates (18) are fixedly installed inside the housing (10), and the upper plate (11) and the lower plate (12) are rotatably connected to the two sides of the two positioning plates (18).

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