Two-stage MVR evaporation crystallization process and equipment

Abstract

The present invention discloses a two-stage MVR evaporation crystallization process and equipment, including a medium transport pipe, a water vapor exhaust pipe and an outer shell. The medium transport pipe coaxially passes through the interior of the water vapor exhaust pipe, and a stirring device is provided on the top of the medium transport pipe. The side walls of the medium transport pipe are correspondingly connected with a first spiral groove evaporator tube and a second spiral groove evaporator tube, and the bottom of the water vapor exhaust pipe is connected with an outer shell. The outer shell and the first spiral groove evaporator tube and the second spiral groove evaporator tube are mutually connected, and the stirring device includes a feed shell connected with the medium transport pipe, and screening holes are evenly opened on the top of the feed shell. A stirring blade motor is installed on the inner wall of the feed shell, and a material transport spiral motor is installed inside the outer shell. The outlet end of the material transport spiral motor is connected with the water vapor exhaust pipe. The present invention has the characteristics of high evaporation efficiency and compact structure.

Description

Technical Field

[0001] The present invention relates to the technical field of evaporation crystallization, in particular to a two-stage MVR evaporation crystallization process and equipment. Background Art

[0002] MVR evaporator is a new type of high-efficiency and energy-saving evaporation equipment mainly used in the pharmaceutical industry. The equipment uses low-temperature and low-pressure steaming technology and clean energy to generate steam and separate the water in the medium. It is an internationally advanced evaporation technology and an upgraded product to replace traditional evaporators.

[0003] Existing evaporation crystallization processes mostly use straight tube and finned evaporation processes. These tubes have a small contact area, which means that water does not stay in the tubes for long, resulting in low evaporation efficiency. Therefore, it is necessary to design a two-stage MVR evaporation crystallization process and equipment with high evaporation efficiency and compact structure. Summary of the Invention

[0004] The object of the present invention is to provide a two-stage MVR evaporation crystallization process and equipment to solve the problems raised in the above background technology.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a two-stage MVR evaporation crystallization process and equipment, including a medium transport pipe, a water vapor exhaust pipe and an outer shell, the medium transport pipe coaxially passes through the interior of the water vapor exhaust pipe, a stirring device is provided on the top of the medium transport pipe, the side walls of the medium transport pipe are correspondingly connected with a first spiral groove evaporation tube and a second spiral groove evaporation tube, the bottom of the water vapor exhaust pipe is connected with an outer shell, and the outer shell and the first spiral groove evaporation tube and the second spiral groove evaporation tube are mutually connected.

[0006] Furthermore, the stirring device includes a feed shell connected to the medium transport pipe, the top of the feed shell is evenly provided with screening holes, and the inner wall of the feed shell is installed with a stirring blade motor.

[0007] Furthermore, a material transport screw motor is installed inside the outer shell, and the outlet end of the material transport screw motor is connected to the medium transport pipe.

[0008] Furthermore, a pressure sensor is installed inside the medium transport pipe, and a distance sensor is installed inside the outer shell.

[0009] Furthermore, exhaust holes are evenly provided on the top of the water vapor exhaust pipe.

[0010] Furthermore, the first spiral groove evaporation tube and the second spiral groove evaporation tube are double spiral structures intertwined with each other, and the rotation radius of the first spiral groove evaporation tube and the second spiral groove evaporation tube is the same as the rotation radius of the outer shell.

[0011] Furthermore, the feed shell is in the shape of an inverted gourd with a larger upper portion and a smaller lower portion.

[0012] Furthermore, the inner wall of the medium transport pipe is evenly provided with a medium temporary storage cavity, one end of the medium temporary storage cavity is connected to the inner wall of the medium transport pipe, and the outer wall of the medium transport pipe is evenly provided with a cylindrical sleeve, one end of the cylindrical sleeve is fixed with a supply pipe by welding.

[0013] Furthermore, a soft rubber tube is provided inside the medium transport tube, and pressure sensors are installed in a ring-shaped manner on the inner wall of the medium transport tube. A flow channel is provided between the inner wall of the medium transport tube and the medium temporary storage cavity, and a sub-transport spiral is provided in the flow channel. A soft rubber tube is provided inside the medium transport tube, and a connecting pipe is provided between the sub-transport spiral and the inner wall of the soft rubber tube.

[0014] Furthermore, an arc-shaped protrusion is installed on one side of the corrugated variant, and one end of the arc-shaped protrusion is connected to a pulling wire. The pulling wire slides through the inner wall of the medium transport tube. The outer wall of the medium transport tube is rotatably installed with a bearing frame through a bracket. The outside of the bearing frame is sleeved with a fixed pulley, and the pulling wire is wound on the fixed pulley.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] (1) By providing a first spiral groove evaporation tube and a second spiral groove evaporation tube in a double spiral distribution, the pressure resistance of the tube wall is improved, and the contact area between the tube wall and the high-temperature water vapor is increased, so that the water evaporates more fully; the use of the spiral groove evaporation tube increases the evaporation area and causes the fluid to form turbulence in the evaporation tube, thereby increasing the evaporation coefficient and accelerating the shedding of water droplets; by providing a stirring device, the medium to be evaporated is blown into the pipe by the stirring blade motor, and the impurities are filtered out by the sieve holes;

[0017] (2) When there is unevenness in the medium at a certain place, the corrugated body will squeeze the medium into the soft rubber tube at the defect, filling the current defect area, making the distribution of the medium more uniform. The cross-section of the medium discharged from the bottom of the medium transport tube is a complete circle, which facilitates the achievement of a uniform transport state. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0019] In the attached figure:

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 It is a schematic structural diagram of the stirring device of the present invention;

[0022] Figure 3 1. It is a schematic diagram of a top view of the first spiral groove evaporation tube and the second spiral groove evaporation tube of the present invention;

[0023] Figure 4 is a schematic cross-sectional view of a first spiral groove evaporation tube and a second spiral groove evaporation tube of the present invention;

[0024] Figure 5 This is a schematic diagram of the internal structure of the medium transport tube of the present invention;

[0025] Figure 6 This is a schematic diagram of the installation of the corrugated variant of the present invention;

[0026] Figure 7 The present invention Figure 6 A magnified schematic diagram of area A in the middle;

[0027] In the figure: 1, medium transport pipe; 2, water vapor discharge pipe; 21, exhaust hole; 3, stirring device; 31, feed shell; 311, screening hole; 33, stirring blade motor; 41, first spiral groove evaporation tube; 42, second spiral groove evaporation tube; 5, outer shell; 51, material transport screw motor;

[0028] 11. Cylindrical sleeve; 12. Medium temporary storage chamber; 13. Soft rubber tube; 14. Arc-shaped inner groove; 15. Corrugated variant; 151. Arc-shaped protrusion; 16. Check valve; 17. Pull wire; 171. Fixed pulley; 172. Bearing frame; 91. Pressure sensor; 92. Transport screw; 93. Connecting pipe.

[0029] Specific implementation process

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] See also Figure 1-7The present invention provides a technical solution: a two-stage MVR evaporation crystallization process and equipment, including a medium transport pipe 1, a water vapor exhaust pipe 2 and an outer shell 5. The medium transport pipe 1 coaxially passes through the interior of the water vapor exhaust pipe 2. A stirring device 3 is provided on the top of the medium transport pipe 1. The side walls of the medium transport pipe 1 are connected to the first spiral groove evaporation pipe 41 and the second spiral groove evaporation pipe 42 respectively. The bottom of the water vapor exhaust pipe 2 is connected to the outer shell 5. The outer shell 5 and the first spiral groove evaporation pipe 41 and the second spiral groove evaporation pipe 42 are mutually connected. The medium to be evaporated enters from the medium transport pipe 1 through the action of the stirring device 3, passes through the first spiral groove evaporation pipe 41 and the second spiral groove evaporation pipe 42 provided at the bottom, and flows into the outer shell 5;

[0032] like Figure 2 The stirring device 3 includes a feed shell 31 connected to the medium transport pipe 1, and the top of the feed shell 31 is evenly provided with screening holes 311. The inner wall of the feed shell 31 is installed with a stirring blade motor 33. The stirring blade motor 33 is used to stir the medium to be evaporated that is blown into the feed shell 31. The screening holes 311 filter out impurities to improve the purity of the material.

[0033] As shown in FIG1 , a material transport screw motor 51 is installed inside the outer shell 5. The outlet end of the material transport screw motor 51 is connected to the medium transport pipe 1. The water flows from the pump to the outer shell 5 through the material transport screw motor 51 and the medium transport pipe 1. During the discharge process, the evaporation medium can be further evaporated, thereby improving the evaporation efficiency.

[0034] like Figure 1 A pressure sensor is installed inside the medium transport pipe 1, and a distance sensor is installed inside the outer shell 5. The pressure sensor is used to sense the transport speed and grasp the fluid state in the evaporation pipe in real time, which helps to improve the evaporation efficiency. The distance sensor is used to sense the medium content of the outer shell 5, which facilitates the real-time grasp of the situation inside the evaporation device.

[0035] As shown in FIG1 , exhaust holes 21 are evenly provided on the top of the water vapor exhaust pipe 2 to facilitate the exhaust of water vapor from the exhaust holes 21;

[0036] like Figure 3The first spiral groove evaporation tube 41 and the second spiral groove evaporation tube 42 are double spiral structures intertwined with each other, and the rotation radius of the first spiral groove evaporation tube 41 and the second spiral groove evaporation tube 42 is the same as the rotation radius of the outer shell 5. The medium to be evaporated in the medium transport tube 1 is directly divided into the first spiral groove evaporation tube 41 and the second spiral groove evaporation tube 42, and after evaporation, they are collected in the outer shell 5. The spiral distribution can improve the pressure resistance of the tube wall and increase the contact area between the tube wall and the high-temperature water vapor, so that the water evaporates more fully. The use of the spiral groove evaporation tube increases the evaporation area and causes the fluid to form turbulence in the evaporation tube, thereby increasing the evaporation coefficient and accelerating the shedding of water droplets.

[0037] like Figure 2 The feed shell 31 is in the shape of an inverted gourd with a larger top and a smaller bottom. After the evaporation medium enters the feed shell 31, the flow rate of the evaporation medium increases when passing through the contracted lower part, and the pressure suddenly decreases, causing water to evaporate more quickly. The wider upper part of the feed shell 31 is used to accommodate more evaporation medium.

[0038] The inner wall of the medium transport pipe 1 is evenly provided with a medium temporary storage cavity 12. One end of the medium temporary storage cavity 12 is connected to the inner wall of the medium transport pipe 1. The inner wall of the medium transport pipe 1 is provided with a flow channel, and both ends of the flow channel are connected to the medium temporary storage cavity 12 and the inner wall of the medium transport pipe 1. The medium is discharged downward through the other end. When the medium is unevenly distributed on the inner wall of the medium transport pipe 1, the medium in the medium temporary storage cavity 12 is used to replenish the inside of the medium transport pipe 1, so that the filling in the cross section can be more uniform.

[0039] The outer wall of the medium transport pipe 1 is evenly provided with cylindrical sleeves 11. Part of the medium is pumped into the medium temporary storage chamber 12 through the supply pipe 4 for temporary storage, which is convenient for the rapid replenishment of the subsequent medium. The pumped medium enters the cylindrical sleeve 11 and then enters the medium temporary storage chamber 12.

[0040] Pressure sensors 91 are installed in an annular pattern on the inner wall of the medium transport pipe 1. A flow channel is provided between the inner wall of the medium transport pipe 1 and the medium temporary storage chamber 12, and a sub-transport spiral 92 is provided in the flow channel. A soft rubber tube 13 is provided inside the medium transport pipe 1. A connecting pipe 93 is provided between the sub-transport spiral 92 and the inner wall of the soft rubber tube 13. If the medium is unevenly distributed, there will be gaps in the medium from the cross-section inside the transport pipe. At this time, the soft rubber tube 13 will be concave at a certain point and no longer have a smooth circular shape. At this position, the pressure sensor 91 senses the pressure change, and the sub-transport spiral pumps the medium into the soft rubber tube 13.

[0041] The inner wall of the medium transport pipe 1 is evenly provided with an arc-shaped inner groove 14, and a corrugated deformer 15 is installed on the inner wall of the arc-shaped inner groove 14. One end of the corrugated deformer 15 is connected to the medium temporary storage chamber 12. A check valve 16 is provided between the corrugated deformer 15 and the medium temporary storage chamber 12. The outer wall of the soft rubber tube 13 is connected to the side wall of the corrugated deformer 15, and the soft rubber tube 13 is provided with a hole at the connection with the corrugated deformer 15. When the medium enters the soft rubber tube 13, the cross section of the soft rubber tube 13 is normally approximately circular, and begins to When the corrugated body 15 is in a compressed state and fits tightly against the outer wall of the soft rubber tube 13, if the medium is unevenly distributed, there will be gaps in the medium from the cross-section inside the transport pipe. At this time, the soft rubber tube 13 will be concave at a certain position, becoming not a smooth circle but a circle with a concave portion. At this time, the corrugated body 15 corresponding to this position will expand because it is not under any force. After expansion, there is a negative pressure inside, and the medium inside the medium temporary storage chamber 12 is sucked into it through the flow channel, which facilitates the judgment of the uniformity of the medium and the replenishment of the medium.

[0042] To improve the sealing performance of the soft rubber tube 13, both ends of the soft rubber tube 13 are fixed to the inner wall of the medium transport tube 1 by bonding. The soft rubber tube 13 has a certain elasticity, so the medium entering the medium transport tube 1 will all enter the soft rubber tube 13, making it easier to determine the cross-sectional profile of the medium.

[0043] An arc-shaped protrusion 151 is installed on one side of the corrugated variant 15. The arc-shaped protrusion 151 is linearly slidably connected to the inner wall of the arc-shaped inner groove 14. One end of the arc-shaped protrusion 151 is connected to a pulling wire 17. The pulling wire 17 slides through the inner wall of the medium transport tube 1. The arc-shaped protrusion 151 contacts the outer wall of the soft rubber tube 13. When the pulling wire 17 is pulled upward, the arc-shaped protrusion 151 moves upward, thereby compressing the corrugated variant 15. At this time, the medium inside the corrugated variant 15 is squeezed out and enters the soft rubber tube 13, replenishing the medium at the defective position of the soft rubber tube 13;

[0044] The outer wall of the medium transport tube 1 is rotatably mounted with a bearing frame 172 through a bracket. A fixed pulley 171 is sleeved on the outside of the bearing frame 172. The pulling wire 17 is wound around the fixed pulley 171. One end of the bearing frame 172 is connected to an external torque. When the corrugated shaper 15 expands, the external torque drives the bearing frame 172 to rotate, causing the fixed pulley 171 to rotate and pull the pulling wire 17 upward, thereby achieving compression of the corrugated shaper 15.

[0045] To better sense when the media should be extruded, a pressure strain gauge is provided at the bottom of the arc-shaped protrusion 151. This pressure strain gauge is electrically connected to the drive end of the bearing frame 172 via an external control system. Normally, the pressure strain gauge and the soft rubber tube 13 are in close contact, and a certain pressure is exerted between them. When the amount of media at a certain point is insufficient, the soft rubber tube 13 will sag downward, causing the corrugated body 15 to expand. Since it has no significant elastic force, the bottom pressure sensed by the pressure strain gauge decreases. At this time, a pressure trigger signal is transmitted to the control system, driving the external torque to rotate the bearing frame 172, causing the corrugated body 15 to compress and extrude the media, thereby identifying the triggering timing.

[0046] An angle sensor is provided on the bearing frame 172, which is used to detect the rotation angle of the bearing frame 172, so as to achieve the effect of detecting the length of the pulling wire 17 lowered. In the ideal state, the corrugated deformer 15 is in contact with the cylindrical soft rubber tube 13. At this time, the angle of the angle sensor is recorded as the initial angle. When the medium of the corrugated deformer 15 is extruded, if the angle of the angle sensor is the initial angle and the pressure sensed by the pressure strain gauge is 0, it means that the medium is evenly filled and the rotation of the bearing frame 172 stops.

[0047] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0048] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A two-stage MVR evaporation crystallization device, comprising a medium transport pipe (1), a water vapor discharge pipe (2) and an outer shell (5), characterized in that: The medium transport pipe (1) coaxially passes through the interior of the water vapor exhaust pipe (2); a stirring device (3) is provided on the top of the medium transport pipe (1); a first spiral groove evaporation pipe (41) and a second spiral groove evaporation pipe (42) are connected to the side wall of the medium transport pipe (1); an outer shell (5) is connected to the bottom of the water vapor exhaust pipe (2); and the outer shell (5) and the first spiral groove evaporation pipe (41) and the second spiral groove evaporation pipe (42) are mutually connected.

2. The two-stage MVR evaporation crystallization equipment according to claim 1, characterized in that: The stirring device (3) comprises a feed shell (31) connected to the medium transport pipe (1), the top of the feed shell (31) is evenly provided with screening holes (311), and the inner wall of the feed shell (31) is equipped with a stirring blade motor (33).

3. The two-stage MVR evaporation crystallization equipment according to claim 2, characterized in that: A material transport screw motor (51) is installed inside the outer shell (5), the outlet end of the material transport screw motor (51) is connected to the medium transport pipe (1), a pressure sensor is installed inside the medium transport pipe (1), and a distance sensor is installed inside the outer shell (5).

4. The two-stage MVR evaporation crystallization equipment according to claim 3, characterized in that: The top of the water vapor exhaust pipe (2) is evenly provided with exhaust holes (21).

5. The two-stage MVR evaporation crystallization equipment according to claim 4, characterized in that: The first spiral groove evaporation tube (41) and the second spiral groove evaporation tube (42) are double helical structures intertwined with each other, and the rotation radius of the first spiral groove evaporation tube (41) and the second spiral groove evaporation tube (42) is the same as the rotation radius of the outer shell (5); the feed shell (31) is an inverted gourd shape with a larger upper part and a smaller lower part.

6. The two-stage MVR evaporation crystallization equipment according to claim 5, characterized in that: The inner wall of the medium transport pipe (1) is uniformly provided with a medium temporary storage cavity (12), one end of which is connected to the inner wall of the medium transport pipe (1), and the outer wall of the medium transport pipe (1) is uniformly provided with a cylindrical sleeve (11), one end of which is fixed with a supply pipe (4) by welding.

7. The two-stage MVR evaporation crystallization equipment according to claim 6, characterized in that: A soft rubber tube (13) is provided inside the medium transport tube (1), and a pressure sensor (91) is installed in an annular distribution on the inner wall of the medium transport tube (1). A flow channel is provided between the inner wall of the medium transport tube (1) and the medium temporary storage chamber (12), and a sub-transport spiral (92) is provided in the flow channel. A soft rubber tube (13) is provided inside the medium transport tube (1), and a connecting pipe (93) is provided between the sub-transport spiral (92) and the inner wall of the soft rubber tube (13).

8. The two-stage MVR evaporation crystallization equipment according to claim 7, characterized in that: The inner wall of the medium transport pipe (1) is evenly provided with an arc-shaped inner groove (14), the inner wall of the arc-shaped inner groove (14) is provided with a corrugated deformer (15), one end of the corrugated deformer (15) is connected to the medium temporary storage chamber (12), a check valve (16) is provided between the corrugated deformer (15) and the medium temporary storage chamber (12), the outer wall of the soft rubber tube (13) is connected to the side wall of the corrugated deformer (15), and the soft rubber tube (13) is connected to the corrugated deformer (15). A hole is provided at the joint, and an arc-shaped protrusion (151) is installed on one side of the corrugated deformation body (15), and one end of the arc-shaped protrusion (151) is connected to a pulling wire (17), and the pulling wire (17) slides through the inner wall of the medium transport tube (1), and the outer wall of the medium transport tube (1) is rotatably installed with a bearing frame (172) through a bracket, and the outer part of the bearing frame (172) is sleeved with a fixed pulley (171), and the pulling wire (17) is wound on the fixed pulley (171).

Images