Split type falling film evaporator set for concentrating sodium aluminate solution

Abstract

The utility model discloses a concentrated sodium aluminate solution split type falling film evaporator set which comprises a falling film evaporator shell, a material distribution plate is installed on the upper portion of an inner cavity of the falling film evaporator shell, a plurality of sets of heat exchange tubes are evenly installed on the lower portion of the material distribution plate, a cavity is formed in the top of the falling film evaporator shell, and the heat exchange tubes are arranged in the cavity. The inner wall of the interior of the cavity is rotationally connected with a plurality of sets of reciprocating lead screws extending into the multiple heat exchange pipes correspondingly, movable circular plates are arranged on the outer rings of the reciprocating lead screws, and a plurality of limiting rods penetrating through the movable circular plates and extending into the heat exchange pipes are evenly installed on the inner wall of the top of the falling film evaporator shell; a clearing plate is installed on the upper portion of the outer ring of the movable circular plate. According to the split type falling film evaporator set for concentrating the sodium aluminate solution, by arranging the driving motor, the reciprocating lead screw, the movable circular plate, the clearing plate and the like, the purpose of clearing the inner wall of the heat exchange pipe through the clearing plate can be achieved, and clearing is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of an evaporator group for concentrating a sodium aluminate solution, in particular to a split-type falling film evaporator group for concentrating a sodium aluminate solution. Background Art

[0002] Sodium aluminate solution is an ionic solution that dissociates into aluminate ions and sodium ions. Its existence form and concentration have a direct impact on the production process conditions and process detection of alumina. Sometimes, when concentrating sodium aluminate solution, a falling film evaporator is required. However, when concentrating sodium aluminate solution through a falling film evaporator, if the sodium aluminate solution is not evenly distributed on the evaporator, crystallization may occur, so it is necessary to treat the crystallization. However, the crystallization of existing sodium aluminate solution evaporators is on the inner wall of the heat exchange tube, which is more difficult to treat. Therefore, we propose a split falling film evaporator for concentrating sodium aluminate solution to solve these problems. Utility Model Content

[0003] The purpose of the utility model is to address the deficiencies of the prior art and provide a split-type falling film evaporator group for concentrating sodium aluminate solution to solve the problems raised in the background technology.

[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a split-type falling film evaporator group for concentrating sodium aluminate solution, comprising a falling film evaporator shell, a distribution plate installed on the upper part of the inner cavity of the falling film evaporator shell, and a plurality of groups of heat exchange tubes evenly installed on the lower part of the distribution plate. A cavity is opened on the top of the falling film evaporator shell, and the inner inner wall of the cavity is rotatably connected to a plurality of groups of reciprocating screws extending respectively into the interior of a plurality of heat exchange tubes, and the outer ring of the reciprocating screw is provided with a movable circular plate, a plurality of limit rods penetrating the movable circular plate and extending into the heat exchange tubes are evenly installed on the top inner wall of the falling film evaporator shell, a clearing plate is installed on the upper part of the outer ring of the movable circular plate, and a drive motor is installed on the top surface of the falling film evaporator shell.

[0005] As a preferred technical solution of the present invention, the output end of the driving motor passes through and extends into the cavity opened in the falling film evaporator shell, and the driving motor is located in the cavity opened in the falling film evaporator shell and is equipped with a large gear.

[0006] As a preferred technical solution of the present invention, the outer rings of the plurality of reciprocating screws located in the cavity defined by the falling film evaporator housing are all equipped with small gears, and the large gears are meshed with the plurality of small gears 11 .

[0007] As a preferred technical solution of the present invention, two limiting rods are passed through both sides of each movable circular plate, and the lower ends of the limiting rods are fixedly connected to the lower part of the outer ring of the heat exchange tube.

[0008] As a preferred technical solution of the present invention, a reciprocating thread hole matching the reciprocating screw is provided in the through hole of the movable circular plate penetrated by the limiting rod, and the outer ring of the cleaning plate fits the inner wall of the heat exchange tube.

[0009] As a preferred technical solution of the present invention, a liquid storage chamber is provided at the lower part of the inner cavity of the falling film evaporator shell, and a liquid outlet pipe is installed at the lower part of the liquid storage chamber, and a valve is installed on the liquid outlet pipe.

[0010] As an optimal technical solution of the present invention, a hot steam inlet pipe is installed on the upper right side of the falling film evaporator shell, a feeding pipe is installed on the upper left side of the falling film evaporator shell, and an exhaust pipe is installed on the lower part of the falling film evaporator shell.

[0011] Compared with the prior art, the present invention provides a split falling film evaporator group for concentrating sodium aluminate solution, which has the following beneficial effects:

[0012] The split-type falling film evaporator group for concentrating sodium aluminate solution is provided with a driving motor, a reciprocating screw, a movable circular plate and a cleaning plate. When the driving motor is started, the large gear can be driven to rotate, and the reciprocating screw can be driven to rotate via the small gear, thereby enabling the movable circular plate to move up and down, and further driving the cleaning plate to move, thereby achieving the purpose of cleaning the inner wall of the heat exchange tube through the cleaning plate, and cleaning is relatively convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0014] Figure 2 This is a schematic diagram of the cross-sectional structure of the falling film evaporator shell of the utility model;

[0015] Figure 3 This is a schematic diagram of the cross-sectional structure of the heat exchange tube of the present invention.

[0016] Figure numerals: 1. Falling film evaporator shell; 2. Hot steam inlet pipe; 3. Liquid storage chamber; 4. Exhaust pipe; 5. Feeding pipe; 6. Driving motor; 7. Heat exchange tube; 8. Moving circular plate; 9. Distribution plate; 10. Reciprocating screw; 11. Small gear; 12. Large gear; 13. Limit rod; 14. Clearing plate. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described 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.

[0018] See also Figure 1-Figure 3 In this embodiment: a split falling film evaporator group for concentrating sodium aluminate solution includes a falling film evaporator shell 1, a distribution plate 9 is installed on the upper part of the inner cavity of the falling film evaporator shell 1, and the sodium aluminate solution can be arranged in the heat exchange tube 7 through the distribution plate 9. A plurality of groups of heat exchange tubes 7 are evenly installed on the lower part of the distribution plate 9. A cavity is opened on the top of the falling film evaporator shell 1, and the inner wall of the cavity is rotatably connected to a plurality of reciprocating screws 10 respectively extending to the interior of the plurality of heat exchange tubes 7, and the outer ring of the reciprocating screw 10 is provided with a plurality of reciprocating screws 10 respectively extending to the interior of the plurality of heat exchange tubes 7. A movable circular plate 8 is provided, and the movable circular plate 8 can move up and down on the reciprocating screw 10. A plurality of limit rods 13 are evenly installed on the top inner wall of the falling film evaporator shell 1, which penetrate the movable circular plate 8 and extend into the heat exchange tube 7. The limit rods 13 can limit the movable circular plate 8 and prevent the movable circular plate 8 from rotating. A cleaning plate 14 is installed on the upper part of the outer ring of the movable circular plate 8 to clean the inner wall of the heat exchange tube 7. A driving motor 6 is installed on the top surface of the falling film evaporator shell 1 to provide power.

[0019] In this embodiment, the output end of the driving motor 6 passes through and extends into the cavity opened by the falling film evaporator shell 1, and the driving motor 6 is provided with a large gear 12 installed in the cavity opened by the falling film evaporator shell 1, and the outer rings of the multiple sets of reciprocating screws 10 located in the cavity opened by the falling film evaporator shell 1 are all provided with small gears 11, and the large gear 12 is meshed with the multiple small gears 11, and can drive the small gears 11 to rotate when the large gear 12 rotates. There are two limit rods 13 passing through on both sides of each moving circular plate 8, which can limit the moving circular plate 8 and prevent the moving circular plate 8 from rotating, and the lower end of the limit rod 13 is fixedly connected to the lower part of the outer ring of the heat exchange tube 7, which can fix the lower part of the limit rod 13, and the moving circular plate 8 is provided with a through hole passed through by the limit rod 13. A reciprocating wire hole matching the reciprocating screw 10 is provided, which can facilitate the movement of the circular plate 8 up and down. The outer ring of the cleaning plate 14 fits against the inner wall of the heat exchange tube 7. The inner wall of the heat exchange tube 7 can be cleaned by moving the cleaning plate 14 up and down. A liquid storage chamber 3 is provided at the lower part of the inner cavity of the falling film evaporator shell 1, and a liquid outlet pipe is installed at the lower part of the liquid storage chamber 3, and a valve is installed on the liquid outlet pipe. When the valve is opened, the concentrated sodium aluminate solution can be discharged. A hot steam inlet pipe 2 is installed on the upper right side of the falling film evaporator shell 1, which can facilitate the passage of hot steam into the interior of the falling film evaporator shell 1. A feeding pipe 5 is installed on the upper left side of the falling film evaporator shell 1, which can pass the sodium aluminate solution into the falling film evaporator shell 1, and an exhaust pipe 4 is installed at the lower part of the falling film evaporator shell 1.

[0020] The working principle and use process of the utility model are as follows: the split falling film evaporator group for concentrating sodium aluminate solution, when the falling film evaporator is required to concentrate the sodium aluminate solution, firstly, hot steam can be sent into the falling film evaporator shell 1 through the hot steam inlet pipe 2, and the heat exchange tube 7 can be heated, and the sodium aluminate solution can be sent into the falling film evaporator shell 1 through the feeding pipe 5. At this time, the sodium aluminate solution will flow onto the distribution plate 9, and can slowly flow downward along the inner wall of the heat exchange tube 7 under the action of the moving circular plate 8, and can pass through the heat exchange tube 7 can concentrate the sodium aluminate solution. After the sodium aluminate solution is concentrated, if the sodium aluminate solution crystallizes and adheres to the inner wall of the heat exchange tube 7, the drive motor 6 can be started at this time. The output end of the drive motor 6 can drive the large gear 12 to rotate, and can drive the reciprocating screw 10 to rotate through the small gear 11, thereby enabling the movable circular plate 8 to move up and down, and further driving the cleaning plate 14 to move, so that the inner wall of the heat exchange tube 7 can be cleaned by the cleaning plate 14, and cleaning is more convenient.

[0021] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is 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 replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. 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 split falling film evaporator assembly for concentrating sodium aluminate solution, comprising a falling film evaporator shell (1), characterized in that: A distribution plate (9) is installed on the upper part of the inner cavity of the falling film evaporator shell (1), and a plurality of groups of heat exchange tubes (7) are evenly installed on the lower part of the distribution plate (9). A cavity is opened on the top of the falling film evaporator shell (1), and the inner wall of the cavity is rotatably connected to a plurality of reciprocating screws (10) extending into the interior of a plurality of heat exchange tubes (7), and the outer ring of the reciprocating screw (10) is provided with a moving circular plate (8). A plurality of limiting rods (13) penetrating the moving circular plate (8) and extending into the heat exchange tube (7) are evenly installed on the top inner wall of the falling film evaporator shell (1), and a clearing plate (14) is installed on the upper part of the outer ring of the moving circular plate (8). A driving motor (6) is installed on the top surface of the falling film evaporator shell (1).

2. The split falling film evaporator group for concentrating sodium aluminate solution according to claim 1, characterized in that: The output end of the driving motor (6) passes through and extends into the cavity opened by the falling film evaporator shell (1), and the driving motor (6) is located in the cavity opened by the falling film evaporator shell (1) and is equipped with a large gear (12).

3. The split falling film evaporator group for concentrating sodium aluminate solution according to claim 1, characterized in that: The outer rings of the plurality of reciprocating screws (10) located in the cavity opened by the falling film evaporator shell (1) are all equipped with small gears (11), and the large gear (12) is meshed with the plurality of small gears 11.

4. The split falling film evaporator group for concentrating sodium aluminate solution according to claim 1, characterized in that: Two limiting rods (13) pass through both sides of each movable circular plate (8), and the lower ends of the limiting rods (13) are fixedly connected to the lower part of the outer ring of the heat exchange tube (7).

5. The split falling film evaporator group for concentrating sodium aluminate solution according to claim 1, characterized in that: A reciprocating thread hole matching the reciprocating screw (10) is provided in the through hole of the movable circular plate (8) penetrated by the limiting rod (13), and the outer ring of the cleaning plate (14) is in contact with the inner wall of the heat exchange tube (7).

6. The split falling film evaporator group for concentrating sodium aluminate solution according to claim 1, characterized in that: A liquid storage chamber (3) is provided at the lower portion of the inner cavity of the falling film evaporator shell (1), and a liquid outlet pipe is installed at the lower portion of the liquid storage chamber (3), and a valve is installed on the liquid outlet pipe.

7. The split-type falling film evaporator group for concentrating sodium aluminate solution according to claim 1, characterized in that: A hot steam inlet pipe (2) is installed on the upper right side of the falling film evaporator shell (1), a feeding pipe (5) is installed on the upper left side of the falling film evaporator shell (1), and an exhaust pipe (4) is installed on the lower part of the falling film evaporator shell (1).

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