Integrated MVR (Mechanical Vapor Recompression) evaporative crystallization equipment

Abstract

The invention discloses integrated MVR (Mechanical Vapor Recompression) evaporative crystallization equipment, and relates to the technical field of evaporative crystallization. Comprising a frame body which is fixedly connected with an evaporation shell, a separator and a crystallizer; the first plate is rotationally connected into the evaporation shell; the first plate is arranged in the evaporation shell, the second plate is arranged in the evaporation shell, heat exchange pipes which are arranged at intervals are fixedly connected between the first plate and the second plate, and the heat exchange pipes are spiral and are used for bearing the gravity of a liquid medium, so that the first plate and the evaporation shell rotate relatively. Torque is applied to the heat exchange pipe through the gravity of a liquid medium, so that the heat exchange pipe rotates, steam in the evaporation shell is disturbed, and the temperature of all positions in the evaporation shell is uniform; therefore, the evaporation degree of the liquid medium in each heat exchange tube tends to be the same (the scaling phenomenon caused by excessive evaporation of the liquid medium in each heat exchange tube is prevented), and the uniformity of crystal precipitation during subsequent crystallization is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of evaporation crystallization, and particularly to an integrated MVR evaporation crystallization device. Background Art

[0002] The MVR evaporation crystallization device is a device that uses mechanical vapor recompression technology for solution concentration and crystallization, and is widely used in industries such as food, pharmaceuticals, and chemicals. Its main structure includes an evaporator, a compressor, and a condenser. By compressing steam to increase the temperature and promote the evaporation of the solution, efficient concentration and crystallization of the solution are achieved. The MVR device has the advantages of energy conservation, high efficiency, and stable product quality, and is suitable for industrial applications with high requirements for energy consumption and product quality.

[0003] In the existing MVR evaporation crystallization device, the evaporator usually only supplies steam to the area where the fixed heat exchange tubes are located. In this process, the steam can only contact all the heat exchange tubes by the way of free diffusion. As a result, the heat exchange tubes contacted by the steam are different, that is, the heat exchange degree between the steam and each heat exchange tube is different, which leads to different evaporation rates of the solution in each heat exchange tube. There is a problem that the solution in some heat exchange tubes dries up and scale forms, affecting the normal progress of the evaporation crystallization work. Summary of the Invention

[0004] In order to overcome the disadvantages mentioned in the above technical background, the present invention provides an integrated MVR evaporation crystallization device.

[0005] The integrated MVR evaporation crystallization device includes: A frame body, the frame body is fixedly connected with an evaporation shell, a separator, and a crystallizer, and the evaporation shell is communicated with the separator through a straight pipe; A pump body, installed on the frame body, the evaporation shell and the separator are fixedly connected and communicated with a first pipe, the first pipe is communicated with the liquid inlet of the pump body, and a second pipe is fixedly connected and communicated between the liquid outlet of the pump body and the crystallizer; A first plate, rotatably connected inside the evaporation shell; A second plate, arranged inside the evaporation shell, heat exchange tubes are fixedly connected between the first plate and the second plate and are arranged at intervals. The heat exchange tubes are spiral-shaped and are used to bear the gravity of the liquid medium, so that the first plate rotates relative to the evaporation shell; A connecting mechanism, arranged in the evaporation shell, and used to guide the movement of the fluid in the evaporation shell.

[0006] Preferably, the height between the upper side of the second plate and the ground gradually decreases from the inside to the outside, and is used to guide the condensed water.

[0007] Preferably, the connecting mechanism includes: The gas injection pipeline is fixedly connected and communicated with the evaporation shell, and the gas injection pipeline is connected to an external steam circulation device; The liquid inlet pipeline is fixedly connected and communicated with the top of the evaporation shell. The liquid inlet pipeline is connected to an external liquid inlet device, and the evaporation shell is fixedly connected and communicated with an air outlet pipeline and a liquid discharge pipeline; The recovery pipeline is fixedly connected and communicated with the separator, and the recovery pipeline is connected to an external steam circulation device.

[0008] Preferably, a liquid distribution plate is rotatably connected in the evaporation shell. The liquid distribution plate is fixedly connected with liquid distribution pipes arranged at intervals. The axis of the liquid distribution pipe forms an angle with the horizontal plane, and the inclination direction of the liquid distribution pipe is opposite to the rotation direction of the heat exchange pipe. The liquid distribution pipes and the heat exchange pipes are arranged in a staggered manner.

[0009] Preferably, the liquid distribution pipe extends out of the liquid distribution plate, and the liquid distribution pipe is made of a deformable material for changing the liquid outlet angle.

[0010] Preferably, it further includes: A rotating shaft is fixedly connected to the first plate, and the rotating shaft is spline-connected to the second plate; A baffle plate is arranged on the rotating shaft. Both the first plate and the second plate are fixedly connected to the baffle plate. The baffle plate is spiral, and the rotation direction of the baffle plate is opposite to the rotation direction of the heat exchange pipe, for blocking adjacent steam, thereby prolonging the heat exchange time. The heat exchange pipe passes through the baffle plate.

[0011] Preferably, the upper side surface of the baffle plate is an inclined surface, and the height of the upper side surface of the baffle plate from the ground gradually decreases from inside to outside.

[0012] Preferably, there is a gap between the heat exchange pipe and the baffle plate to facilitate the flow of condensed water.

[0013] Preferably, it further includes: A limiting ring is fixedly connected to one side of the evaporation shell close to the second plate. The second plate is slidably and rotatably connected to the evaporation shell. Both the heat exchange pipe and the baffle plate can undergo elastic deformation. The rotating shaft is slidably connected to the baffle plate. The second plate is fixedly connected with a fixing rod; A roller is rotatably connected to the fixing rod. The limiting ring is used to support the roller, and there is an angle between one side of the limiting ring close to the baffle plate and the horizontal plane.

[0014] Preferably, the side of the limiting ring close to the roller is a concave surface, and the roller is frustum-shaped.

[0015] Compared with the prior art, the beneficial effects of the present invention at least include: The present invention applies a torque to the heat exchange tube through the gravity of the liquid medium, so that the heat exchange tube rotates, thereby disturbing the steam in the evaporation shell, making the temperature uniform everywhere in the evaporation shell, and further making the evaporation rate of the liquid medium in the heat exchange tubes everywhere in the evaporation shell uniform, so that the evaporation degree of the liquid medium in each heat exchange tube tends to be the same (preventing fouling due to excessive evaporation of the liquid medium in individual heat exchange tubes), thus ensuring the concentration of the concentrated liquid accumulated at the bottom of the evaporation shell everywhere, and facilitating the uniformity of crystal precipitation during subsequent crystallization; The landing point of the liquid medium on the first plate is used to disturb the liquid medium in adjacent areas on the first plate, thereby changing the stable state of the liquid medium, making the formed liquid medium film vibrate, increasing the heat exchange degree between the liquid medium film and the adjacent heat exchange tubes, and further improving the evaporation crystallization effect and efficiency; Under the combined action of the limiting ring limiting the roller and the gravity of the heat exchange tube and the baffle plate, the heat exchange tube and the baffle plate undergo reciprocating deformation, thereby disturbing the steam in adjacent areas. At the same time, during the deformation process of the heat exchange tube and the baffle plate, they will also come into relative contact and extrusion, so that they squeeze each other and generate vibrations, accelerating the detachment of the condensed water on them and improving the heat utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a three-dimensional structural schematic diagram of the whole of the present invention; Figure 2 is a three-dimensional structural schematic diagram of the evaporation shell, separator and crystallizer of the present invention; Figure 3 is a three-dimensional structural schematic diagram of the separator and crystallizer of the present invention; Figure 4 is a three-dimensional structural schematic diagram of the first plate, second plate and heat exchange tube of the present invention; Figure 5 is a three-dimensional structural sectional view of the evaporation shell, first plate and second plate of the present invention; Figure 6 is a three-dimensional structural sectional view of the evaporation shell, second plate and limiting ring of the present invention; Figure 7 is a three-dimensional structural explosion diagram of the evaporation shell and its internal parts of the present invention.

[0017] Marks in the drawings: 1: frame body, 2: evaporation shell, 3: separator, 4: crystallizer, 5: pump body, 6: first pipe, 7: second pipe, 8: first plate, 9: second plate, 10: heat exchange tube, 1101: gas injection pipeline, 1102: liquid inlet pipeline, 1103: gas outlet pipeline, 1104: liquid discharge pipeline, 1106: recovery pipeline, 1201: liquid distribution plate, 1202: liquid distribution pipe, 1301: rotating shaft, 1302: baffle plate, 1401: limiting ring, 1402: fixing rod, 1403: roller. DETAILED DESCRIPTION OF THE INVENTION

[0018] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation mode of the present invention is described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are elaborated to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein. Those skilled in the art can make similar improvements without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0019] like Figures 1-4 As shown, an integrated MVR evaporation crystallization device is proposed to solve the problem that when the existing evaporation crystallization device is working, the steam can only contact the heat exchange tube by free diffusion, so that the steam contacts different heat exchange tubes in sequence, resulting in different evaporation rates of the solution in each heat exchange tube, and there is a problem that the solution in the heat exchange tube dries up and scales, thereby affecting the normal operation of the evaporation crystallization. The device comprises: a frame 1, the frame 1 is fixedly connected with an evaporation shell 2, a separator 3 and a crystallizer 4, and the evaporation shell 2 and the separator 3 are connected through a straight pipe; a pump body 5, which is installed on the frame 1, and the evaporation shell 2 and the separator 3 are fixedly connected and connected with a first pipe 6 The first tube 6 is connected to the liquid inlet of the pump body 5, and the liquid outlet of the pump body 5 is fixedly connected to the crystallizer 4 and connected to the second tube 7; the first plate 8 is rotatably connected to the evaporation shell 2; the second plate 9 is arranged in the evaporation shell 2, and the height between the upper side of the second plate 9 and the ground gradually decreases from the inside to the outside, which is used to guide the condensed water. The first plate 8 and the second plate 9 are fixedly connected with spaced heat exchange tubes 10, which are spirally arranged and used to bear the gravity of the liquid medium, so that the first plate 8 and the evaporation shell 2 rotate relative to each other; the connecting mechanism is arranged in the evaporation shell 2, and is used to guide the movement of the fluid in the evaporation shell 2.

[0020] In the above scheme, the frame 1 is provided with a steel frame ladder (not shown in the figure) to facilitate personnel to inspect and repair the equipment. The straight pipe between the evaporation shell 2 and the separator 3 is located at the lower part of the two. The upper part of the second plate 9 is truncated, which is convenient for guiding the condensed water. The heat exchange tube 10 is arranged in a multi-layer annular array from the outside to the inside. The heat exchange tube 10 is right-handed, and the number of spiral turns of the heat exchange tube 10 is one-half, which is used to extend the moving distance of the liquid medium therein and increase the contact time between the two. The axis of the evaporation shell 2, the axis of the first plate 8 and the axis of the second plate 9 coincide. When it is necessary to use this equipment, the staff uses the connecting mechanism to inject high-temperature steam and high-concentration brine into the evaporation shell 2 (for the convenience of description, steam and brine are used as substitutes for description below). The brine enters from the upper part of the evaporation shell 2, and after being distributed by the first plate 8, it flows downward along the inner wall of the adjacent heat exchange tube 10 (forming a water film). Since the heat exchange tube 10 is spiral, the force exerted by the brine on the heat exchange tube 10 has a force that drives the heat exchange tube 10 to rotate counterclockwise (such as Figure 3Taking the top view direction as an example), that is, during the downward flow of the brine, the heat exchange tube 10 is also driven to rotate counterclockwise, and the heat exchange tube 10 drives the first plate 8 and the second plate 9 to rotate counterclockwise together.

[0021] During the process of the brine entering the evaporation shell 2, steam also enters the evaporation shell 2. The steam contacts the rotating heat exchange tube 10 and transfers heat to the brine inside the heat exchange tube 10 at the same time, thereby evaporating most of the water in the brine. Finally, after the brine flows out of the heat exchange tube 10, it accumulates at the bottom inside the evaporation shell 2 in the state of concentrated liquid, and then the concentrated liquid is transferred to the crystallizer 4 through the connecting mechanism, the first pipe 6 and the second pipe 7 (which is a prior art and is used for crystallizing the brine filled with concentrated liquid, and its detailed working principle will not be elaborated too much here).

[0022] During the counterclockwise rotation of the heat exchange tube 10, steam continuously enters the evaporation shell 2, and the steam in the adjacent areas of the rotating heat exchange tube 10 is stirred, so as to make the temperature uniform everywhere inside the evaporation shell 2, and then make the evaporation rate of the brine in the heat exchange tube 10 everywhere inside the evaporation shell 2 uniform, so that the evaporation degree of the brine in each heat exchange tube 10 tends to be the same (preventing the liquid medium in individual heat exchange tubes from evaporating excessively and causing scaling), so as to ensure the concentration of the concentrated liquid accumulated at the bottom inside the evaporation shell 2 everywhere, and then facilitate the uniformity of crystal precipitation during subsequent crystallization. At the same time, due to the blockage of the inner wall of the spiral heat exchange tube 10 to the brine inside it, when the brine flows downward, its state is a turbulent state, that is, there is a mixed flow in each layer of the brine (film). In this way, the brine (film) is uniformly heated, improving the evaporation effect of the brine. The steam (containing salt) generated by the evaporation of the brine enters the separator 3 through the straight pipe. Here, part of the steam (containing salt) condenses to produce concentrated liquid, which accumulates at the bottom inside the separator 3. The concentrated liquid here is also transferred to the crystallizer 4 through the connecting mechanism, the first pipe 6 and the second pipe 7, and the crystallizer 4 continuously discharges the crystal slurry generated inside it.

[0023] During the heat exchange process between the steam and the heat exchange tube 10, the temperature of the steam gradually decreases, generating low-temperature steam and condensed water, both of which are discharged through the connecting mechanism. Steam and brine continuously enter the evaporation shell 2, concentrated liquid continuously enters the crystallizer 4, and crystal slurry is continuously produced. This continues until the crystallization work is completed, and then stop injecting steam and brine into the evaporation shell 2 and cut off the power supply.

[0024] Such as Figures 1-5As shown in the figure, the connection mechanism includes: an air injection pipe 1101, fixedly connected and communicating with the evaporation shell 2, and the air injection pipe 1101 is connected to an external steam circulation device; a liquid inlet pipe 1102, fixedly connected and communicating with the top of the evaporation shell 2, and the liquid inlet pipe 1102 is connected to an external liquid inlet device, and the evaporation shell 2 is fixedly connected and communicates with an air outlet pipe 1103 and a liquid discharge pipe 1104; a recovery pipe 1106, fixedly connected and communicating with the separator 3, and the recovery pipe 1106 is connected to an external steam circulation device. A liquid distribution plate 1201 is rotatably connected in the evaporation shell 2. The liquid distribution plate 1201 is fixedly connected with liquid distribution pipes 1202 arranged at intervals. The angle between the axis of the liquid distribution pipe 1202 and the horizontal plane, and the inclination direction of the liquid distribution pipe 1202 is opposite to the rotation direction of the heat exchange pipe 10. The liquid distribution pipes 1202 and the heat exchange pipes 10 are arranged in a staggered manner (during the working process, the liquid distribution pipes 1202 are always located between two adjacent heat exchange pipes 10). The liquid distribution pipes 1202 extend out of the liquid distribution plate 1201, and the liquid distribution pipes 1202 are made of deformable material, so that when the brine is discharged, the turbulent flow of the brine itself causes the liquid distribution pipes 1202 to deform, thereby changing the liquid discharge angle.

[0025] In the above solution, the air injection pipe 1101 is located in the upper part of the evaporation shell 2, and the air injection pipe 1101 is located between the axis of the first plate 8 and the second plate 9. Both the air outlet pipe 1103 and the liquid discharge pipe 1104 are located between the axis of the first plate 8 and the second plate 9 (both the air outlet pipe 1103 and the liquid discharge pipe 1104 are located in the middle and lower part of the evaporation shell 2). The air outlet pipe 1103 is located above the liquid discharge pipe 1104. The liquid distribution pipes 1202 are made of soft rubber material. All the liquid distribution pipes 1202 are arranged in a layer-by-layer annular array from the inside to the outside. During the use of this equipment, steam enters the evaporation shell 2 through the air injection pipe 1101, contacts the heat exchange pipe 10 and exchanges heat therewith. Brine enters the evaporation shell 2 through the liquid inlet pipe 1102. The concentrated liquid in the evaporation shell 2 and the separator 3 both enter the first pipe 6. The steam in the separator 3 then enters the external steam circulation device through the recovery pipe 1106 for recycling. During the working process of this equipment, the temperature of the steam gradually decreases in the evaporation shell 2 and condensed water is generated. The low-temperature steam is discharged through the air outlet pipe 1103, and the condensate is discharged through the liquid discharge pipe 1104.

[0026] After the brine enters the evaporation shell 2, the brine is evenly distributed by the liquid distribution plate 1201 and then enters the adjacent liquid distribution pipe 1202. Then the brine contacts the first plate 8. Since the liquid distribution pipe 1202 is located between two adjacent heat exchange pipes 10, during the counterclockwise rotation of the heat exchange pipe 10, the brine flowing out of the liquid distribution pipe 1202 always directly falls on the first plate 8 (it will not directly enter the heat exchange pipe 10, thus affecting the brine film). In this way, the position of the brine on the first plate 8 is continuously changed, and the brine in the adjacent area on the first plate 8 is disturbed by the landing point of the brine on the first plate 8, thereby changing the stable state of the brine, making the formed brine film vibrate, increasing the heat exchange degree between the brine film and the adjacent heat exchange pipe 10, and further improving the evaporation crystallization effect and efficiency.

[0027] During the process of the brine flowing through the heat exchange pipe 10, the brine also applies a torque to the liquid distribution pipe 1202, so as to drive the liquid distribution pipe 1202 to rotate clockwise (taking the top view direction as an example). The liquid distribution pipe 1202 drives the liquid distribution plate 1201 to rotate clockwise together, so as to further accelerate the change of the landing point of the brine on the first plate 8, further increase the heat exchange degree between the brine film and the adjacent heat exchange pipe 10, and further improve the evaporation crystallization effect and efficiency. Figure 5 As shown in the figure, it further includes: a rotating shaft 1301, fixedly connected to the first plate 8, and the rotating shaft 1301 is splined to the second plate 9; a baffle plate 1302, arranged on the rotating shaft 1301, both the first plate 8 and the second plate 9 are fixedly connected to the baffle plate 1302. The baffle plate 1302 is spiral, and the spiral direction of the baffle plate 1302 is opposite to the spiral direction of the heat exchange pipe 10, and is used to block the adjacent steam, so as to extend the heat exchange time. The number of spiral turns of the baffle plate 1302 is more than that of the heat exchange pipe 10, and is used to make the two undergo different degrees of deformation when subjected to the same extrusion. The heat exchange pipe 10 passes through the baffle plate 1302. The upper side of the baffle plate 1302 is an inclined surface, and the height of the upper side of the baffle plate 1302 from the ground gradually decreases from the inside to the outside. There is a gap between the heat exchange pipe 10 and the baffle plate 1302 to facilitate the flow of condensed water.

[0028] As Figures 5-7 shown, it further includes: a rotating shaft 1301, fixedly connected to the first plate 8, and the rotating shaft 1301 is splined to the second plate 9; a baffle plate 1302, arranged on the rotating shaft 1301, both the first plate 8 and the second plate 9 are fixedly connected to the baffle plate 1302. The baffle plate 1302 is spiral, and the spiral direction of the baffle plate 1302 is opposite to the spiral direction of the heat exchange pipe 10, and is used to block the adjacent steam, so as to extend the heat exchange time. The number of spiral turns of the baffle plate 1302 is more than that of the heat exchange pipe 10, and is used to make the two undergo different degrees of deformation when subjected to the same extrusion. The heat exchange pipe 10 passes through the baffle plate 1302. The upper side of the baffle plate 1302 is an inclined surface, and the height of the upper side of the baffle plate 1302 from the ground gradually decreases from the inside to the outside. There is a gap between the heat exchange pipe 10 and the baffle plate 1302 to facilitate the flow of condensed water.

[0029] In the above solution, the baffle 1302 is in contact with the inner wall of the evaporation shell 2. The axes of the evaporation shell 2, the rotating shaft 1301, and the baffle 1302 coincide. The cross-section of the baffle 1302 is a "right trapezoid", and the lower base is located on the side close to the rotating shaft 1301, which is used to guide the condensed water, so as to reduce the contact time between the condensed water and the heat exchange tube 10. The number of spiral turns of the baffle 1302 is more than that of the heat exchange tube 10. During the counterclockwise rotation of the first plate 8, the first plate 8 drives the rotating shaft 1301 to rotate counterclockwise together, and the rotating shaft 1301 drives the baffle 1302 to rotate counterclockwise together. The rotating baffle 1302 upwardly squeezes the downwardly moving steam, so as to delay the separation of the steam from the heat exchange tube 10, thereby prolonging the heat exchange time between the two, improving the utilization rate of the steam, reducing the energy consumption. During the heat exchange process between the steam and the heat exchange tube 10, the temperature of the steam gradually decreases, and condensed water is gradually generated. The condensed water moves downward as a whole along the upper side of the baffle 1302 from top to bottom. At the same time, the condensed water also moves from the middle of the baffle 1302 to the outside. In this way, the condensed water is located at the outer edge of the baffle 1302 during the downward movement. At the same time, during the heat exchange process, the condensed water generated on the outer wall of the heat exchange tube 10 will directly flow downward along the outer wall of the heat exchange tube 10, so as to prevent the condensed water from contacting the heat exchange tube 10 for a long time (absorbing heat), thereby affecting the normal evaporation of the brine.

[0030] As Figures 4-6 shown, it further includes: a limit ring 1401, fixedly connected to one side of the evaporation shell 2 close to the second plate 9. The second plate 9 is slidably and rotatably connected to the evaporation shell 2. Both the heat exchange tube 10 and the baffle 1302 can undergo elastic deformation. The rotating shaft 1301 is slidably connected to the baffle 1302. The second plate 9 is fixedly connected with a fixing rod 1402; a roller 1403, rotatably connected to the fixing rod 1402. The limit ring 1401 is used to support the roller 1403. There is an angle between the side of the limit ring 1401 close to the baffle 1302 and the horizontal plane. The side of the limit ring 1401 close to the roller 1403 is a concave surface, and the roller 1403 is frustum-shaped.

[0031] In the above solution, the axis of the limit ring 1401 coincides with the axis of the second plate 9. The heat exchange tube 10 and the baffle plate 1302 are both produced from titanium alloy thin plates. The heat exchange tube 10 and the baffle plate 1302 are not deformed in their initial states. The height of the upper side of the limit ring 1401 from the horizontal plane gradually increases from left to right as a whole. The outer diameter of the roller 1403 gradually decreases from left to right. The roller 1403 fits with the concave surface on the limit ring 1401. During the counterclockwise rotation of the second plate 9, the second plate 9 drives the fixed rod 1402 to rotate counterclockwise together. The fixed rod 1402 drives the roller 1403 to rotate counterclockwise together. The roller 1403 starts to roll along the limit ring 1401. Now, taking the position where the roller 1403 is located at Figure 6 as the starting position for description, the limit ring 1401 gradually loses its support for the roller 1403. The roller 1403 drives the second plate 9 to start moving downward through the fixed rod 1402 (the second plate 9 has a tendency to move downward under the action of the gravity of the heat exchange tube 10 and the baffle plate 1302). The second plate 9 slides relative to the rotating shaft 1301. The heat exchange tube 10 and the baffle plate 1302 are both stretched, so as to further disturb the steam in the evaporation shell 2 and improve the uniformity of the steam distribution in the evaporation shell 2, thereby improving the evaporation effect on the brine.

[0032] As the second plate 9 rotates counterclockwise, the roller 1403 rolls to the leftmost part on the upper side of the limit ring 1401. At this time, the roller 1403 is at the lowest point. Then the limit ring 1401 presses the roller 1403 upward again. The roller 1403 drives the limit ring 1401 to move upward together through the fixed rod 1402. In this way, the heat exchange tube 10 and the baffle plate 1302 are continuously deformed, and the steam in the adjacent area is continuously disturbed. At the same time, during the deformation process of the heat exchange tube 10 and the baffle plate 1302, they will also come into relative contact and extrusion. In this way, they squeeze each other and generate vibrations, accelerating the detachment of the condensed water on them and improving the heat utilization rate. This process repeats until the evaporation and crystallization of the brine are completed.

[0033] Although the present invention has been described above with reference to the embodiments, various improvements can be made to it and its components can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the various features in the disclosed embodiments of the present invention can be combined with each other in any way. The exhaustive description of these combinations is not given in this specification only for the sake of saving space and resources. Therefore, the present invention is not limited to the specific embodiments disclosed in the text.

Claims

1. Integrated MVR evaporation crystallization equipment, characterized in that: Included are: A frame (1), the frame (1) being fixedly connected with an evaporation shell (2), a separator (3) and a crystallizer (4), the evaporation shell (2) and the separator (3) being connected via a straight pipe; A pump body (5) is mounted on the frame (1); the evaporation shell (2) and the separator (3) are fixedly connected together and communicated with a first tube (6); the first tube (6) is communicated with a liquid inlet of the pump body (5); and the liquid outlet of the pump body (5) is fixedly connected to the crystallizer (4) and communicated with a second tube (7); A first plate (8) rotatably connected to the evaporation shell (2); a second plate (9) disposed in the evaporation shell (2), heat exchange tubes (10) arranged at intervals being fixedly connected between the first plate (8) and the second plate (9), the heat exchange tubes (10) being spiral-shaped and used to bear the gravity of the liquid medium, thereby causing the first plate (8) and the evaporation shell (2) to rotate relative to each other; A connecting mechanism is arranged on the evaporation shell (2) and is used to guide the movement of the fluid in the evaporation shell (2).

2. The integrated MVR evaporation crystallization equipment according to claim 1 is characterized in that: The height of the upper side of the second plate (9) from the ground gradually decreases from the inside to the outside, and is used to guide condensed water.

3. The integrated MVR evaporation crystallization equipment according to claim 2 is characterized in that: The connecting mechanism comprises: An air injection pipeline (1101) is fixedly connected to and communicated with the evaporation shell (2), and the air injection pipeline (1101) is connected to an external steam circulation device; A liquid inlet pipe (1102) is fixedly connected to and communicated with the top of the evaporation shell (2); the liquid inlet pipe (1102) is connected to an external liquid inlet device; the evaporation shell (2) is fixedly connected to and communicated with an air outlet pipe (1103) and a liquid discharge pipe (1104); A recovery pipe (1106) is fixedly connected to and communicated with the separator (3), and the recovery pipe (1106) is connected to an external steam circulation device.

4. The integrated MVR evaporation crystallization equipment according to claim 3 is characterized in that: A liquid distribution plate (1201) is rotatably connected inside the evaporation shell (2); the liquid distribution plate (1201) is fixedly connected with liquid distribution pipes (1202) arranged at intervals; the angle between the axis of the liquid distribution pipe (1202) and the horizontal plane; and the inclination direction of the liquid distribution pipe (1202) is opposite to the rotation direction of the heat exchange pipe (10); the liquid distribution pipe (1202) and the heat exchange pipe (10) are arranged in a staggered manner.

5. The integrated MVR evaporation crystallization equipment according to claim 4 is characterized in that: The liquid distribution tube (1202) extends out of the liquid distribution plate (1201), and the liquid distribution tube (1202) is made of a deformable material and is used to change the liquid outlet angle.

6. The integrated MVR evaporation crystallization equipment according to claim 5 is characterized in that: Also included are: A rotating shaft (1301) is fixedly connected to the first plate (8), and the rotating shaft (1301) is spline-connected to the second plate (9); A blocking plate (1302) is arranged on the rotating shaft (1301); the first plate (8) and the second plate (9) are both fixedly connected to the blocking plate (1302); the blocking plate (1302) is spiral-shaped, and the rotation direction of the blocking plate (1302) is opposite to the rotation direction of the heat exchange tube (10), and is used to block adjacent steam, thereby extending the heat exchange time; the heat exchange tube (10) passes through the blocking plate (1302).

7. The integrated MVR evaporation crystallization equipment according to claim 6, characterized in that: The upper side surface of the blocking plate (1302) is an inclined surface, and the height of the upper side surface of the blocking plate (1302) from the ground gradually decreases from the inside to the outside.

8. The integrated MVR evaporation crystallization equipment according to claim 7 is characterized in that: There is a gap between the heat exchange tube (10) and the blocking plate (1302), which facilitates the flow of condensed water.

9. The integrated MVR evaporation crystallization equipment according to claim 8, characterized in that: Also included are: A limiting ring (1401) is fixedly connected to a side of the evaporation shell (2) close to the second plate (9); the second plate (9) is slidably and rotatably connected to the evaporation shell (2); the heat exchange tube (10) and the blocking plate (1302) are both elastically deformable; the rotating shaft (1301) is slidably connected to the blocking plate (1302); and the second plate (9) is fixedly connected to a fixing rod (1402); The roller (1403) is rotatably connected to the fixing rod (1402); the limiting ring (1401) is used to support the roller (1403); and an angle exists between a side of the limiting ring (1401) close to the blocking plate (1302) and a horizontal plane.

10. The integrated MVR evaporation crystallization equipment according to claim 9, characterized in that: The side of the limiting ring (1401) close to the roller (1403) is an inner concave surface, and the roller (1403) is in the shape of a truncated cone.

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