MVR thin film vacuum evaporator

Abstract

This invention discloses an MVR thin-film vacuum evaporator, relating to the field of evaporators, including a thin-film evaporator main unit, a feeding assembly, a discharging assembly, and a secondary steam assembly. The thin-film evaporator main unit includes a rotating cone and a shell. The shell includes an upper shell assembly, a shell cover, and a shell base. The upper shell assembly is fixed to the shell base by the shell cover. In this invention, material is sprayed from the feeding pipe onto the inner surface of the rotating cone. Due to the rotation of the rotating cone, the material sprayed onto the inner surface of the rotating cone forms a 0.1 mm film, which can exchange heat with the steam in the rotating cone, the shell base, and the shell cover. Under the same evaporation capacity, the heat exchange area of ​​the equipment is reduced by at least 60%, and the steam energy consumption is reduced by 80%. The secondary steam assembly maintains the steam in the cavity formed by the rotating cone, the shell base, and the shell cover at a set temperature through a primary steam outlet pipe, a secondary steam outlet pipe, and a secondary steam inlet pipe, eliminating the need for cooling water treatment of the secondary steam and improving heat exchange efficiency.

Description

Technical Field

[0001] This invention relates to the field of evaporators, and more specifically to an MVR thin-film vacuum evaporator. Background Technology

[0002] Currently, high-viscosity materials are processed using single-, double-, and triple-effect forced circulation evaporators, while low-viscosity materials are processed using single-, double-, triple-, quadruple-, and five-effect falling film evaporators. However, the evaporation intensity of both types of evaporators is not high. To achieve the same evaporation capacity, the equipment needs to increase the heat exchange area, which causes two problems: firstly, it increases the equipment manufacturing cost; secondly, it prolongs the heating time of the material, thus affecting its quality. Furthermore, the evaporation temperatures of these two types of evaporators are relatively high: 55℃ for the single-effect evaporator, 68℃ for the double-effect evaporator, 78℃ for the triple-effect evaporator, 85℃ for the quadruple-effect evaporator, and 90℃ for the fifth-effect evaporator. Higher efficiency numbers result in greater energy savings, but also higher evaporation temperatures, which negatively impacts product quality.

[0003] In summary, an MVR thin-film vacuum evaporator was designed. Summary of the Invention

[0004] To overcome the above-mentioned shortcomings, the present invention provides an MVR thin-film vacuum evaporator.

[0005] The present invention achieves the above objectives through the following technical solutions: An MVR thin-film vacuum evaporator includes a thin-film evaporator main unit, a feeding assembly, a discharging assembly, and a secondary steam assembly, wherein the thin-film evaporator main unit is connected to the feeding assembly, the discharging assembly, and the secondary steam assembly respectively. The thin-film evaporator main unit includes a rotating cone and a housing. The housing includes an upper housing assembly, a housing cover, and a housing base. The upper housing assembly is fixed to the housing base by the housing cover. The rotating cone is connected to a drive unit. The shape of the housing cover and the rotating cone are both cones. The rotating cone is located inside the housing cover. The housing upper component is equipped with a feeding and discharging component. The feeding and discharging component is connected to the feeding component and the discharging component, respectively. The feeding and discharging component is located inside the rotating cone. The cavity formed between the rotating cone, the housing upper component, the housing cover, and the housing base is connected to the secondary steam component.

[0006] Preferably, the feeding and discharging assembly includes a feeding pipe and a discharging pipe. One end of the feeding pipe is connected to the feeding assembly, and the other end of the feeding pipe is located at the top edge of the rotating cone. One end of the discharging pipe is connected to the discharging assembly, and the other end of the discharging pipe is located at the bottom edge of the rotating cone.

[0007] Preferably, the discharge port of the discharge pipe is perpendicular to the curved surface of the rotating cone, so that the contact area between the raw material ejected from the discharge port and the curved surface of the rotating cone can be maximized.

[0008] Preferably, the feed pipe and the discharge pipe extend through the sealing cover on the upper end face of the rotating cone and into the interior of the sealing cover. The sealing cover and the rotating cone are slidably connected, which can ensure that the feed pipe continuously injects raw materials and the discharge pipe continuously discharges raw materials while the rotating cone is constantly rotating.

[0009] Preferably, the drive unit includes a geared motor and a bearing housing, wherein the geared motor drives the rotating cone to rotate axially through the bearing housing.

[0010] Preferably, the feeding assembly includes a material buffer tank and a material preheater. The material buffer tank is connected to the feed pipe through the material preheater. The material buffer tank is connected to a feed pump, and the material in the material buffer tank enters the feed pipe through the feed pump.

[0011] Preferably, the discharge assembly includes a material balance tank and a concentration buffer tank. The discharge pipe is connected to the concentration buffer tank through the material balance pipe. The material balance tank is connected to a vacuum pump. A discharge screw pump is also provided between the concentration buffer tank and the material balance tank.

[0012] Preferably, the secondary steam assembly includes an MVR steam compressor, which is connected to the primary steam outlet pipe on the housing cover and the secondary steam outlet pipe on the housing assembly, and is also connected to the secondary steam inlet pipe on the housing assembly.

[0013] Preferably, one side of the housing base is connected to a steam inlet, and a front shut-off valve is provided at the steam inlet. The other side of the housing base is connected to a condensate outlet, and the condensate outlet is connected to a condensate tank.

[0014] The beneficial effects of this invention are: in this MVR thin-film vacuum evaporator: The material is sprayed from the feed pipe onto the inner surface of the rotating cone. Due to the rotation of the rotating cone, the material sprayed onto the inner surface of the rotating cone forms a 0.1 mm film, which can exchange heat with the steam in the rotating cone, the shell base, and the shell cover. Under the same evaporation capacity, the heat exchange area of ​​the equipment is reduced by at least 60%, and the steam energy consumption is reduced by 80%. The secondary steam assembly maintains the set temperature of the steam in the cavity formed by the rotating cone, the base of the housing, and the top cover of the housing through the primary steam outlet pipe, the secondary steam outlet pipe, and the secondary steam inlet pipe. This eliminates the need for cooling water to treat the secondary steam, thus improving heat exchange efficiency. Attached Figure Description

[0015] The present invention will be described by way of example and with reference to the accompanying drawings, wherein: Figure 1This is a schematic diagram of the structure of the MVR thin-film vacuum evaporator of the present invention; Figure 2 This is a schematic diagram of the structure of the thin-film evaporator main unit of the present invention; Figure 3 This is a schematic diagram of the rotating cone of the present invention. Detailed Implementation

[0016] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0017] like Figures 1-3 As shown, an MVR thin-film vacuum evaporator includes a thin-film evaporator main unit 15, a feeding assembly, a discharging assembly, and a secondary steam assembly. The thin-film evaporator main unit 15 is connected to the feeding assembly, the discharging assembly, and the secondary steam assembly, respectively. The thin film evaporator main unit 15 includes a rotating cone 1 and a housing. The housing includes a housing upper component 6, a housing upper cover 5 and a housing base 4. The housing upper component 6 is fixed to the housing base 4 by the housing upper cover 5. The rotating cone 1 is connected to a drive unit. The shape of the housing cover 5 and the rotating cone 1 are both cones. The rotating cone 1 is located inside the housing cover 5. The housing upper component 6 is provided with a feeding and discharging component. The feeding and discharging component is connected to the feeding component and the discharging component respectively. The feeding and discharging component is located inside the rotating cone 1. The cavity formed between the rotating cone 1, the housing upper component 6, the housing cover 5 and the housing base 4 is connected to the secondary steam component.

[0018] Specifically, the feeding and discharging assembly includes a feeding pipe 7 and a discharging pipe 8. One end of the feeding pipe 7 is connected to the feeding assembly, and the other end of the feeding pipe 7 is located at the top edge of the rotating cone 1. One end of the discharging pipe 8 is connected to the discharging assembly, and the other end of the discharging pipe 8 is located at the bottom edge of the rotating cone 1.

[0019] Specifically, the discharge port of the discharge pipe 8 is perpendicular to the curved surface of the rotating cone 1, so that the contact area between the raw material ejected from the discharge port and the curved surface of the rotating cone 1 can be maximized.

[0020] Specifically, the feed pipe 7 and the discharge pipe 8 pass through the sealing cover 14 on the upper end face of the rotating cone 1 and extend into the interior of the sealing cover 14. The sealing cover 14 and the rotating cone 1 are slidably connected, which can ensure that the feed pipe 7 continuously injects raw materials and the discharge pipe 8 continuously discharges raw materials while the rotating cone 1 is continuously rotating.

[0021] Specifically, the drive unit includes a geared motor 3 and a bearing housing 2, and the geared motor 3 drives the rotating cone 1 to rotate axially through the bearing housing 2.

[0022] Specifically, the feeding assembly includes a material buffer tank 16 and a material preheater 24. The material buffer tank 16 is connected to the feed pipe 7 through the material preheater 24. The material buffer tank 16 is connected to a feed pump 23. The material in the material buffer tank 16 enters the feed pipe 7 through the feed pump 23.

[0023] Specifically, the discharge assembly includes a material balance tank 18 and a concentration buffer tank 17. The discharge pipe 8 is connected to the concentration buffer tank 17 through the material balance pipe. The material balance tank 18 is connected to a vacuum pump 21. A discharge screw pump 22 is also provided between the concentration buffer tank 17 and the material balance tank 18.

[0024] Specifically, the secondary steam assembly includes an MVR steam compressor 20, which is connected to the primary steam outlet pipe 11 on the housing cover 5 and the secondary steam outlet pipe 10 on the housing assembly 6. The MVR steam compressor 20 is also connected to the secondary steam inlet pipe 9 on the housing assembly 6.

[0025] Specifically, one side of the housing base 4 is connected to a steam inlet 12, and a front shut-off valve 25 is provided at the steam inlet 12. The other side of the housing base 4 is connected to a condensate outlet 13, and the condensate outlet 13 is connected to a condensate tank 19.

[0026] MVR thin-film vacuum evaporator structure introduction: The rotating cone 1 is driven to rotate by the geared motor 3 through the bearing seat 2. The material is sprayed onto the inner surface of the rotating cone 1 through the feed pipe 7. Due to the rotation of the rotating cone 1, the material sprayed onto the inner surface of the rotating cone 1 forms a 0.1 mm film, which can exchange heat with the steam in the rotating cone 1, the shell base 4 and the shell cover 5. Since the vacuum inside the rotating cone 1 is -0.083 MPa, the material starts to evaporate when it reaches 55°C. The secondary steam generated by evaporation is discharged from the secondary steam outlet pipe 10 of the shell component 6 and enters the thin-film evaporator main unit 15. The 55°C secondary steam is compressed into 70°C secondary steam and enters the cavity formed by the rotating cone 1, the shell base 4 and the shell cover 5 through the secondary steam inlet pipe 9. However, when the evaporation temperature is stable at 55°C, the manual shut-off valve before the steam inlet 12 can be closed.

[0027] Working process of the MVR rotary cone 1 thin film vacuum evaporator; a. Turn on the equipment; the equipment enters production mode.

[0028] b. First, start the vacuum pump 21 to evacuate the entire equipment. When the vacuum reaches -0.08Mpa, start the feed pump 23, set the feed flow rate, and the material enters the feed pipe 7 through the material preheater 24 (set temperature is 60℃). Manually open the steam inlet 12 front shut-off valve 25.

[0029] c. The thin-film evaporator main unit 15 will start automatically after 10 seconds.

[0030] d. When the evaporation temperature rises to 65°C, manually close the manual shut-off valve for the steam entering the rotating cone 1.

[0031] e. Automatically start the discharge screw pump 22 (set the discharge screw pump frequency to 15Hz), and the equipment will operate normally.

[0032] Technical effect Using the current equipment, under the same evaporation capacity, the heat exchange area is reduced by at least 60%, steam energy consumption is reduced by 80%, secondary steam treatment with cooling water is not required, and there is basically no impact on the color and quality of the material.

[0033] Based on the above description, those skilled in the art can make various changes and modifications without departing from the technical concept of this invention. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. An MVR thin-film vacuum evaporator, characterized in that: It includes a thin-film evaporator main unit, a feeding assembly, a discharging assembly, and a secondary steam assembly, with the thin-film evaporator main unit connected to the feeding assembly, the discharging assembly, and the secondary steam assembly, respectively; The thin-film evaporator main unit includes a rotating cone and a housing. The housing includes an upper housing assembly, a housing cover, and a housing base. The upper housing assembly is fixed to the housing base by the housing cover. The rotating cone is connected to a drive unit. The shape of the housing cover and the rotating cone are both cones. The rotating cone is located inside the housing cover. The housing upper component is equipped with a feeding and discharging component. The feeding and discharging component is connected to the feeding component and the discharging component, respectively. The feeding and discharging component is located inside the rotating cone. The cavity formed between the rotating cone, the housing upper component, the housing cover, and the housing base is connected to the secondary steam component.

2. The MVR thin-film vacuum evaporator according to claim 1, characterized in that: The feeding and discharging assembly includes a feeding pipe and a discharging pipe. One end of the feeding pipe is connected to the feeding assembly, and the other end of the feeding pipe is located at the top edge of the rotating cone. One end of the discharging pipe is connected to the discharging assembly, and the other end of the discharging pipe is located at the bottom edge of the rotating cone.

3. The MVR thin-film vacuum evaporator according to claim 2, characterized in that: The discharge port of the discharge pipe is perpendicular to the curved surface of the rotating cone.

4. The MVR thin-film vacuum evaporator according to claim 2, characterized in that: The feed pipe and discharge pipe extend through the sealing cover on the upper end face of the rotating cone and into the interior of the sealing cover, with the sealing cover and the rotating cone being slidably connected.

5. The MVR thin-film vacuum evaporator according to claim 1, characterized in that: The drive unit includes a geared motor and a bearing housing, and the geared motor drives the rotating cone to rotate axially through the bearing housing.

6. The MVR thin-film vacuum evaporator according to claim 1, characterized in that: The feeding assembly includes a material buffer tank and a material preheater. The material buffer tank is connected to the feed pipe through the material preheater. The material buffer tank is connected to a feed pump, and the material in the material buffer tank enters the feed pipe through the feed pump.

7. The MVR thin-film vacuum evaporator according to claim 1, characterized in that: The discharge assembly includes a material balance tank and a concentration buffer tank. The discharge pipe is connected to the concentration buffer tank through the material balance pipe. The material balance tank is connected to a vacuum pump. A discharge screw pump is also provided between the concentration buffer tank and the material balance tank.

8. The MVR thin-film vacuum evaporator according to claim 1, characterized in that: The secondary steam assembly includes an MVR steam compressor, which is connected to the primary steam outlet pipe on the upper cover of the housing and the secondary steam outlet pipe on the upper assembly of the housing, and is also connected to the secondary steam inlet pipe on the upper assembly of the housing.

9. An MVR thin-film vacuum evaporator according to claim 1, characterized in that: One side of the housing base is connected to a steam inlet, and a front shut-off valve is provided at the steam inlet. The other side of the housing base is connected to a condensate outlet, and the condensate outlet is connected to a condensate tank.

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