Forced circulation crystallizer of MVR (Mechanical Vapor Recompression) evaporator

Abstract

The utility model discloses a forced circulation crystallizer of an MVR (mechanical vapor recompression) evaporator, which relates to the technical field of evaporators and comprises a heater, a condensate water storage tank, a mother liquor tank, an evaporation device and a crystallizer, the bottom of the evaporation device is communicated with the top of the crystallizer, and one side of the evaporation device is connected with the top of the heater through a fifth pipeline. The bottom of the heater is fixedly connected with a scale collecting device, and the bottoms of the heater and the scale collecting device are connected with a forced circulation pump. According to the forced circulation crystallizer of the MVR evaporator, steam flows in the shell in a reversing mode through the multiple flow guide plates, the heat exchange effect between the steam and the heat exchange pipe is improved, the scraping plates scrape the inner wall of the heat exchange pipe, liquid is prevented from being attached to the inner wall of the heat exchange pipe, heat exchange of the heat exchange pipe is not affected, and meanwhile the heat exchange effect of the heat exchange pipe is improved. The scaling of the liquid on the inner wall of the heat exchange tube is reduced, and the scaling is collected through the action of the filter screen, so that the scaling is prevented from staying in the heat exchange tube to influence the flowing of the liquid.

Description

Technical Field

[0001] The utility model relates to the technical field of evaporators, and more specifically, to an MVR evaporator forced circulation crystallizer. Background Art

[0002] MVR evaporator (mechanical vapor recompression evaporator) is a highly efficient evaporation technology that reuses the energy of the secondary steam generated by the system itself through the compressor, thereby reducing the demand for external steam. In some applications, MVR evaporator is often used in combination with a forced circulation crystallizer to improve crystallization efficiency.

[0003] During the operation of existing equipment, especially inside the heater, the heat of steam circulates in the heater, causing the heating tube in the heater to evaporate due to heat, and the liquid in the heating tube generates steam. The liquid gradually thickens and is prone to scaling. When scale accumulates inside the heating tube, the working efficiency of the equipment will deteriorate, and manual shutdown and disassembly are required for cleaning, which affects the working efficiency of the equipment. Utility Model Content

[0004] In order to overcome the above-mentioned defects of the prior art, an embodiment of the present invention provides an MVR evaporator forced circulation crystallizer to solve the problem that the heat of the existing steam circulates in the heater, causing the heating tube in the heater to evaporate under heat, and the liquid in the heating tube to generate steam. The liquid gradually thickens and is prone to scaling. When scale accumulates inside the heating tube, the working efficiency of the equipment will deteriorate, and manual shutdown and disassembly are required for cleaning, which affects the working efficiency of the equipment.

[0005] To solve the above technical problems, the utility model provides the following technical solutions: an MVR evaporator forced circulation crystallizer, comprising a heater, a condensed water storage tank, a mother liquid tank, an evaporation device and a crystallizer, the bottom of the evaporation device being connected to the top of the crystallizer, one side of the evaporation device being connected to the top of the heater through a fifth pipe, the bottom of the heater being fixedly connected to a scale collecting device, the heater and the bottom of the scale collecting device being connected to a forced circulation pump, one side of the lower end of the heater being connected to the condensed water storage tank, the condensed water storage tank being connected to the mother liquid tank, the top of the mother liquid tank being connected to one side of the evaporation device through a first pipe, one side of the upper end of the heater being fixedly connected to a third pipe, the tail end of the third pipe being fixedly connected to a steam circulation pump, the top of the evaporation device being connected to the steam circulation pump through a second pipe, the steam circulation pump being connected to the heater through a third pipe, and one side of the crystallizer being connected to the forced circulation pump through a fourth pipe.

[0006] The heater comprises a shell, a plurality of heat exchange pipes are arranged in the shell, a plurality of flow guide plates are fixedly installed in the shell, the flow guide plates are staggered and distributed on both sides of the shell, and a rotating device is fixedly installed on the outer surface of the upper end of the shell.

[0007] The upper end of the shell is fixedly connected with a top plate, the top plate is fixedly sleeved on the outer surface of the upper end of the heat exchange pipe, a limiting frame is fixedly installed on the inner wall of the shell, an annular gear is rotatably installed on the upper end of the shell, the annular gear is rotatably installed between the top plate and the limiting frame, a plurality of first magnets are embedded on the inner side of the outer side of the annular gear, and a cleaning device is arranged in the heat exchange pipe.

[0008] The rotating device comprises a supporting frame, the supporting frame is fixedly installed on the outer surface of the upper end of the shell, a rotating motor is fixedly installed on one side of the bottom of the supporting frame, a drive gear is fixedly installed on the output end of the rotating motor, the drive gear is rotatably installed in the supporting frame, a rotating gear is rotatably installed between the supporting frame and the shell, the outer surface of the rotating gear is engaged with the outer surface of the drive gear, a plurality of second magnets are embedded on the inner wall of the rotating gear, and the second magnets are magnetically connected with the first magnets.

[0009] The cleaning device comprises a transmission gear, the transmission gear is rotatably installed on the top of the top plate, the outer surface of the transmission gear is engaged with the inner wall of the annular gear, a connecting frame is fixedly installed in the transmission gear, a scraper is fixedly installed on the bottom of the connecting frame, and the scraper is rotatably installed on the inner wall of the heat exchange pipe.

[0010] The bottom of the shell is fixedly installed with a water inlet head, the lower end of the shell is fixedly installed with a bottom plate, the bottom plate is fixedly sleeved on the outer surface of the lower end of the heat exchange pipe, one side of the lower end of the shell is fixedly communicated with a condensate water pipe, the condensate water pipe is located above the bottom plate, a filter screen is fixedly installed in the water inlet head, and a flow guide pipe is fixedly communicated on one side of the water inlet head.

[0011] The filter screen is fixedly installed in the water inlet head in an inclined manner, and the flow guide pipe is located on one side of the lower part of the filter screen.

[0012] The scale collecting device comprises a collecting box, the bottom of the collecting box is fixedly communicated with a backflow pipe, one end of the backflow pipe is communicated with the forced circulation pump, a rotating head is threadedly installed on the top of the collecting box, a supporting rod is fixedly installed on the bottom of the rotating head, a filter basket is fixedly installed on the bottom of the supporting rod, the filter basket is embeddedly installed in the collecting box, and the upper end of the collecting box is communicated with the condensate water pipe.

[0013] The technical effects and advantages of the utility model are:

[0014] 1. The liquid is circulated from bottom to top by the forced circulation pump, while the steam flows downward through the upper end of the heater and is diverted inside the shell by the plurality of baffles, increasing the residence time of the steam inside the shell and the heat exchange effect with the heat exchange tubes;

[0015] 2. The scraper scrapes the inner wall of the heat exchange tube to prevent liquid from adhering to the inner wall of the heat exchange tube, not only preventing liquid from adhering to the inner wall of the heat exchange tube and affecting the heat exchange of the heat exchange tube, but also reducing the scaling of the liquid on the inner wall of the heat exchange tube;

[0016] 3. The dirt inside the heat exchange tube falls from the bottom of the heat exchange tube by gravity and slides into the inner part of the guide pipe through the action of the filter screen and falls into the inner part of the filter basket for collection, realizing the collection of scaling and avoiding the scaling from staying inside the heat exchange tube and affecting the flow of liquid;

[0017] 4. The filter basket is taken out from the inside of the material collecting box by rotating the rotating head, facilitating the cleaning of the scaling. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a schematic diagram of the overall structure of the present application;

[0019] Figure 2 is a schematic diagram of the internal structure of the heater of the present application;

[0020] Figure 3 is a schematic diagram of the Figure 2 structure of the present application at position A;

[0021] Figure 4 is a schematic diagram of the structure of the rotating device of the present application;

[0022] Figure 5 is a schematic diagram of the structure of the cleaning device of the present application;

[0023] Figure 6 is a schematic diagram of the Figure 2 structure of the present application at position B;

[0024] Figure 7 is a schematic diagram of the structure of the scaling collecting device of the present application.

[0025] The accompanying drawings are marked as follows: 1. steam circulation pump; 2. heater; 3. forced circulation pump; 4. scale collecting device; 5. condensed water storage tank; 6. mother liquid tank; 7. evaporation device; 8. crystallizer; 11. first pipeline; 12. second pipeline; 13. third pipeline; 14. fourth pipeline; 15. fifth pipeline; 20. cleaning device; 21. housing; 22. rotating device; 23. guide plate; 24. heat exchange tube; 25. top plate; 26. limit frame; 27. Ring gear; 28. First magnet; 29. ​​Bottom plate; 210. Condensate pipe; 211. Water inlet head; 212. Filter screen; 213. Guide pipe; 201. Transmission gear; 202. Connecting frame; 203. Scraper; 221. Support frame; 222. Rotating motor; 223. Drive gear; 224. Rotating gear; 225. Second magnet; 41. Collecting box; 42. Return pipe; 43. Rotating head; 44. Support rod; 45. Filter basket. DETAILED DESCRIPTION

[0026] In order to make the technical problems to be solved, technical solutions and advantages of the present invention clearer, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0027] Example 1, as shown in the attached Figure 1 To the attached Figure 2 , an embodiment of the utility model provides an MVR evaporator forced circulation crystallizer, comprising a heater 2, a condensed water storage tank 5, a mother liquid tank 6, an evaporation device 7 and a crystallizer 8, the bottom of the evaporation device 7 is connected to the top of the crystallizer 8, one side of the evaporation device 7 is connected to the top of the heater 2 through a fifth pipe 15, the bottom of the heater 2 is fixedly connected to a scale collecting device 4, the heater 2 and the bottom of the scale collecting device 4 are connected to a forced circulation pump 3, one side of the lower end of the heater 2 is connected to the condensed water storage tank 5, the condensed water storage tank 5 is connected to the mother liquid tank 6, the top of the mother liquid tank 6 is connected to one side of the evaporation device 7 through a first pipe 11, one side of the upper end of the heater 2 is fixedly connected to a third pipe 13, the tail end of the third pipe 13 is fixedly connected to a steam circulation pump 1, the top of the evaporation device 7 is connected to the steam circulation pump 1 through a second pipe 12, the steam circulation pump 1 is connected to the heater 2 through the third pipe 13, and one side of the crystallizer 8 is connected to the forced circulation pump 3 through a fourth pipe 14.

[0028] An appropriate amount of liquid is added to the mother liquid tank 6, and the liquid passes through a preheater (not shown in the figure) for preheating. The liquid enters the interior of the evaporation device 7 through the first pipe 11. At this time, the steam floats up and the liquid descends to the interior of the crystallizer 8. The liquid is crystallized by the crystallizer 8, and the crystals precipitated from the liquid are filtered and retained in the interior of the crystallizer 8. The uncrystallized liquid flows into the interior of the forced circulation pump 3 through the fourth pipe 14, and enters the interior of the heater 2 through the forced circulation pump 3, is heated by the heater 2, and re-enters the internal circulation of the evaporation device 7, while the steam enters the interior of the steam circulation pump 1 through the second pipe 12 for compression, and enters the interior of the heater 2 through the third pipe 13, and exchanges heat with the heat exchange pipe 24. The steam generates condensed water through the heat exchange of the heat exchange pipe 24, and flows back to the interior of the condensed water storage tank 5 through the condensed water pipe 210, and the mother liquid tank 6 is replenished with liquid through the condensed water storage tank 5 to realize circulation.

[0029] The liquid flows from bottom to top through the forced circulation pump 3, while the steam flows downward through the upper end of the heater 2, thereby improving the heat exchange effect of the liquid.

[0030] like Figure 2 As shown, the heater 2 includes an outer shell 21, a plurality of heat exchange tubes 24 are arranged inside the outer shell 21, a plurality of guide plates 23 are fixedly installed inside the outer shell 21, and the plurality of guide plates 23 are staggered on both sides of the inner shell 21, and a rotating device 22 is fixedly installed on the outer surface of the upper end of the outer shell 21.

[0031] The steam is made to flow in a reverse direction inside the shell 21 by the multiple guide plates 23 , thereby increasing the residence time of the steam inside the shell 21 and increasing the heat exchange effect between the steam and the heat exchange tubes 24 .

[0032] like Figure 3 - Figure 4 As shown, the upper end of the interior of the shell 21 is fixedly connected to a top plate 25, and the top plate 25 is fixedly sleeved on the outer surface of the upper end of the heat exchange tube 24. The upper end of the inner wall of the shell 21 is fixedly installed with a limit frame 26. The upper end of the interior of the shell 21 is rotatably installed with a ring gear 27, and the ring gear 27 is rotatably installed between the top plate 25 and the limit frame 26. A plurality of first magnets 28 are embedded in the interior of the outer side of the ring gear 27, and a cleaning device 20 is provided inside the heat exchange tube 24.

[0033] The rotating device 22 comprises a support frame 221 fixedly installed on the outer surface of the upper end of the shell 21, a rotating motor 222 fixedly installed on one side of the bottom of the support frame 221, a driving gear 223 fixedly installed on the output end of the rotating motor 222, the driving gear 223 being rotatably installed in the inside of the support frame 221, a rotating gear 224 rotatably installed between the support frame 221 and the shell 21, the outer surface of the rotating gear 224 being engaged with the outer surface of the driving gear 223, and a plurality of second magnets 225 embedded on the inner wall of the rotating gear 224, the second magnets 225 being magnetically connected with the first magnets 28.

[0034] Through the magnetic connection between the second magnets 225 and the first magnets 28, the driving gear 223 is controlled to rotate by the rotating motor 222, the rotating gear 224 is rotated in the inside of the support frame 221, the annular gear 27 is rotated on the inner wall of the shell 21, the rotation of the annular gear 27 is controlled, and then the rotation of the cleaning device 20 is controlled, so that the scraper 203 is scraped on the inner wall of the heat exchange pipe 24, liquid is prevented from being attached on the inner wall of the heat exchange pipe 24, the heat exchange of the heat exchange pipe 24 is affected, and the scaling of liquid on the inner wall of the heat exchange pipe 24 is reduced.

[0035] The first magnets 28 are arranged on the outer side of the annular gear 27, the second magnets 225 are arranged on the inner side of the rotating gear 224, and the shell 21 is in a relatively closed state, so that the heat exchange of liquid is not affected, and the possibility of liquid leakage in the later period is prevented.

[0036] The cleaning device 20 comprises a transmission gear 201 rotatably installed on the top of the top plate 25, the outer surface of the transmission gear 201 is engaged with the inner wall of the annular gear 27, a connecting frame 202 is fixedly installed in the inside of the transmission gear 201, a scraper 203 is fixedly installed on the bottom of the connecting frame 202, and the scraper 203 is rotatably installed on the inner wall of the heat exchange pipe 24.

[0037] In the embodiment two, as shown in the accompanying Figure 1 to the accompanying Figure 7 The embodiment of the utility model provides a kind of MVR evaporator forced circulation crystallizer, the bottom of shell 21 is fixedly installed with water inlet head 211, the lower end in the inside of shell 21 is fixedly installed with bottom plate 29, bottom plate 29 is fixedly sleeved on the outer surface of the lower end of heat exchange pipe 24, one side of the lower end of shell 21 is fixedly communicated with condensate pipe 210, condensate pipe 210 is located above bottom plate 29, filter screen 212 is fixedly installed in the inside of water inlet head 211, one side of water inlet head 211 is fixedly communicated with flow guide pipe 213.

[0038] The filter screen 212 is fixedly installed in the inside of water inlet head 211 in an inclined manner, and the flow guide pipe 213 is located on one side of the lower part of the filter screen 212.

[0039] Wherein, the scale collecting device 4 includes a collecting tank 41, the bottom of the collecting tank 41 is fixedly communicated with a backflow pipe 42, one end of the backflow pipe 42 is communicated with the forced circulation pump 3, the top of the collecting tank 41 is screwedly installed with a rotating head 43, the bottom of the rotating head 43 is fixedly installed with a supporting rod 44, the bottom of the supporting rod 44 is fixedly installed with a filter basket 45, the filter basket 45 is embeddedly installed in the inside of the collecting tank 41, and the upper end of the collecting tank 41 is communicated with the condensate pipe 210.

[0040] After the scale on the inner wall of the heat exchange pipe 24 is scraped by the scraper 203, the dirt in the heat exchange pipe 24 falls from the lower portion of the heat exchange pipe 24 by gravity, and, through the action of the filter screen 212, slides into the inside of the flow guide pipe 213 and falls into the inside of the filter basket 45 for collection, so that the scale is collected and the scale is prevented from staying in the heat exchange pipe 24 to affect the flow of liquid.

[0041] The working process of the utility model is as follows:

[0042] In the mother liquor tank 6, a proper amount of liquid is added, the liquid is preheated through a preheater (not shown in the figure), the liquid enters into the inside of the evaporation device 7 through the first pipeline 11, at this time, steam rises, and the liquid falls into the inside of the crystallizer 8, the liquid is crystallized by the crystallizer 8, the crystals separated out from the liquid remain in the inside of the crystallizer 8, and the liquid not crystallized enters into the inside of the heater 2 through the forced circulation pump 3, is heated by the heater 2 and reenters into the inside of the evaporation device 7 for circulation, while the steam enters into the inside of the steam circulation pump 1 through the second pipeline 12 for compression and enters into the inside of the heater 2 through the third pipeline 13 and exchanges heat with the heat exchange pipe 24, the steam exchanges heat with the heat exchange pipe 24 to generate condensate water, the condensate water returns to the inside of the condensate storage tank 5 through the condensate pipe 210 and replenishes the liquid of the mother liquor tank 6 through the condensate storage tank 5, so that the circulation is realized;

[0043] Through the magnetic connection of the second magnet 225 and the first magnet 28, the rotation of the driving gear 223 is controlled by the rotating motor 222, the rotating gear 224 rotates in the inside of the supporting frame 221, the ring gear 27 rotates on the inner wall of the shell 21, the rotation of the ring gear 27 is controlled, the rotation of the cleaning device 20 is further controlled, the scraper 203 scrapes on the inner wall of the heat exchange pipe 24, liquid is prevented from adhering to the inner wall of the heat exchange pipe 24, not only the liquid adhering to the inner wall of the heat exchange pipe 24 is avoided to affect the heat exchange of the heat exchange pipe 24, but also the scale of the liquid on the inner wall of the heat exchange pipe 24 is reduced;

[0044] After the scale on the inner wall of the heat exchange tube 24 is scraped off by the scraper 203, the dirt inside the heat exchange tube 24 falls from the bottom of the heat exchange tube 24 due to gravity, and slides into the inside of the guide tube 213 through the action of the filter screen 212, and falls into the inside of the filter basket 45 for collection, thereby collecting the scale and preventing the scale from staying inside the heat exchange tube 24 and affecting the flow of the liquid. Finally, by rotating the rotating head 43, the filter basket 45 is removed to facilitate the cleaning of the scale.

[0045] Finally, a few points should be explained: the drawings of the embodiments disclosed in this utility model only involve structures related to the embodiments disclosed in this utility model. Other structures can refer to common designs. In the absence of conflicts, the same embodiment and different embodiments of the utility model can be combined with each other.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An MVR evaporator forced circulation crystallizer, comprising a heater (2), a condensed water storage tank (5), a mother liquid tank (6), an evaporation device (7) and a crystallizer (8), characterized in that: The bottom of the evaporation device (7) is connected to the top of the crystallizer (8), one side of the evaporation device (7) is connected to the top of the heater (2) through a fifth pipe (15), the bottom of the heater (2) is fixedly connected to a scale collecting device (4), the bottoms of the heater (2) and the scale collecting device (4) are connected to a forced circulation pump (3), one side of the lower end of the heater (2) is connected to a condensed water storage tank (5), the condensed water storage tank (5) is connected to a mother liquid tank (6), and the top of the mother liquid tank (6) is connected to a condensed water storage tank (5). One side of the evaporation device (7) is connected via a first pipe (11); one side of the upper end of the heater (2) is fixedly connected to a third pipe (13); the tail end of the third pipe (13) is fixedly connected to a steam circulation pump (1); the top of the evaporation device (7) is connected to the steam circulation pump (1) via a second pipe (12); the steam circulation pump (1) is connected to the heater (2) via a third pipe (13); and one side of the crystallizer (8) is connected to the forced circulation pump (3) via a fourth pipe (14).

2. The MVR evaporator forced circulation crystallizer according to claim 1, characterized in that: The heater (2) comprises a shell (21), a plurality of heat exchange tubes (24) are arranged inside the shell (21), a plurality of guide plates (23) are fixedly installed inside the shell (21), and the plurality of guide plates (23) are staggeredly distributed on both sides of the shell (21), and a rotating device (22) is fixedly installed on the outer surface of the upper end of the shell (21).

3. The MVR evaporator forced circulation crystallizer according to claim 2, characterized in that: The upper end of the interior of the shell (21) is fixedly connected to a top plate (25), and the top plate (25) is fixedly sleeved on the outer surface of the upper end of the heat exchange tube (24). The upper end of the inner wall of the shell (21) is fixedly installed with a limit frame (26). The upper end of the interior of the shell (21) is rotatably installed with a ring gear (27), and the ring gear (27) is rotatably installed between the top plate (25) and the limit frame (26). A plurality of first magnets (28) are embedded in the interior of the outer side of the ring gear (27). A cleaning device (20) is provided inside the heat exchange tube (24).

4. The MVR evaporator forced circulation crystallizer according to claim 3, characterized in that: The rotating device (22) comprises a support frame (221), wherein the support frame (221) is fixedly mounted on the outer surface of the upper end of the housing (21), a rotating motor (222) is fixedly mounted on one side of the bottom of the support frame (221), a driving gear (223) is fixedly mounted on the output end of the rotating motor (222), the driving gear (223) is rotatably mounted inside the support frame (221), a rotating gear (224) is rotatably mounted between the support frame (221) and the housing (21), the outer surface of the rotating gear (224) is meshed with the outer surface of the driving gear (223), and a plurality of second magnets (225) are embedded in the inner wall of the rotating gear (224), and the second magnets (225) are magnetically connected to the first magnet (28).

5. The MVR evaporator forced circulation crystallizer according to claim 3, characterized in that: The cleaning device (20) comprises a transmission gear (201), the transmission gear (201) being rotatably mounted on the top of the top plate (25), and the outer surface of the transmission gear (201) being meshed with the inner wall of the ring gear (27), a connecting frame (202) being fixedly mounted inside the transmission gear (201), a scraper (203) being fixedly mounted at the bottom of the connecting frame (202), and the scraper (203) being rotatably mounted on the inner wall of the heat exchange tube (24).

6. The MVR evaporator forced circulation crystallizer according to claim 2, characterized in that: A water inlet head (211) is fixedly installed at the bottom of the shell (21), a bottom plate (29) is fixedly installed at the lower end of the interior of the shell (21), and the bottom plate (29) is fixedly sleeved on the outer surface of the lower end of the heat exchange tube (24). One side of the lower end of the shell (21) is fixedly connected to a condensation water pipe (210), and the condensation water pipe (210) is located above the bottom plate (29). A filter screen (212) is fixedly installed inside the water inlet head (211), and one side of the water inlet head (211) is fixedly connected to a flow guide pipe (213).

7. The MVR evaporator forced circulation crystallizer according to claim 6, characterized in that: The filter screen (212) is fixedly installed in an inclined manner inside the water inlet head (211), and the flow guide pipe (213) is located on one side of the lower part of the filter screen (212).

8. The MVR evaporator forced circulation crystallizer according to claim 7, characterized in that: The dirt collecting device (4) includes a collection box (41), the bottom of the collection box (41) is fixedly connected to a return pipe (42), one end of the return pipe (42) is connected to the forced circulation pump (3), the top of the collection box (41) is threadedly installed with a rotating head (43), the bottom of the rotating head (43) is fixedly installed with a support rod (44), the bottom of the support rod (44) is fixedly installed with a filter basket (45), the filter basket (45) is embedded in the interior of the collection box (41), and the upper end of the collection box (41) is connected to the condensate pipe (210).

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