Device for improving uniform film distribution of evaporator

Abstract

The utility model discloses a device for improving uniform film distribution of an evaporator, which comprises a cylindrical heating chamber and a flange plate above the heating chamber, a steam injection pipe and a drain pipe are arranged on the circumference of the heating chamber, a plurality of heating pipes are orderly arranged in the heating chamber, one end of each heating pipe extends out of the flange plate, and the other end of each heating pipe extends out of the bottom end of the heating chamber. The surface of the flange plate is provided with a protection device used for protecting a port of the heating pipe. The device for improving the uniform film distribution of the evaporator can ensure the mother liquor heating effect during use, is reasonable in overall structure, can prevent the pipe head of the heating pipe from being washed, and is suitable for popularization and use.

Description

Technical Field

[0001] The utility model relates to the technical field of evaporators for aluminum oxide production, in particular to a device for improving uniform film distribution of an evaporator. Background Art

[0002] In the alumina production process, the falling film evaporator main equipment contains a film plate, whose function is to evenly distribute the circulating mother liquor into the heating tube. The mother liquor flows naturally along the inner wall of the heating tube, achieving a better heat exchange effect between the mother liquor and steam.

[0003] Conventional membrane discs are composed of 2-3 layers, each layer consists of disc surfaces with different holes. The circulating mother liquid flows naturally from top to bottom and finally enters the heating tube.

[0004] However, since there is a certain height between the last layer of membrane disc and the heating tube and the holes on the membrane disc are directly facing the heating tube, it is easy to cause serious scouring of the heating tube head and uneven membrane distribution; and the mother liquid is also easy to fall directly out of the tube, affecting heat exchange, and the use effect is not ideal. Utility Model Content

[0005] The purpose of the utility model is to solve the above problems and provide a device that can ensure the mother liquor heating effect, has a reasonable overall structure, can avoid scouring of the heating tube head and improve the uniform film distribution of the evaporator.

[0006] To achieve the above-mentioned purpose, the technical solution of the present invention is: a device for improving the uniform film distribution of the evaporator, comprising a cylindrical heating chamber and a flange plate above the heating chamber, a steam injection pipe and a drainage pipe being provided on the circumference of the heating chamber, a plurality of heating tubes being arranged in an orderly manner in the heating chamber, one end of the heating tube extending out of the flange plate, and the other end extending out of the bottom end of the heating chamber, and a protective device for protecting the heating tube port being provided on the surface of the flange plate.

[0007] Preferably, the protective device includes a protective sleeve and an umbrella cap, the bottom end of the protective sleeve is fixed on the flange plate, the protective sleeve and the umbrella cap are fixedly connected by a bracket, the heating tube is fixed on the inner wall of the protective sleeve, and the material overflows the protective sleeve and enters the heating tube.

[0008] Preferably, a flange extending toward the axis is provided at the upper port of the protective sleeve, the heating tube is fixed directly below the flange, the inner diameter of the flange is consistent with the inner diameter of the heating tube, and the material overflows the flange and flows downward along the inner wall of the heating tube.

[0009] Preferably, the heights of the brackets in each two adjacent rows are inconsistent.

[0010] Preferably, the outer diameter of the umbrella cap is larger than the outer diameter of the protective sleeve.

[0011] The utility model discloses a device for improving the uniform film distribution of an evaporator, comprising a cylindrical heating chamber and a flange plate above the heating chamber, a steam injection pipe and a drain pipe being provided on the circumference of the heating chamber, a plurality of heating tubes being arranged in an orderly manner in the heating chamber, one end of the heating tube extending out of the flange plate, and the other end extending out of the bottom end of the heating chamber, a protective device for protecting the heating tube port being provided on the surface of the flange plate; compared with the prior art, the device for improving the uniform film distribution of the evaporator has the beneficial effect of ensuring the mother liquor heating effect when in use, and has a reasonable overall structure, which can avoid scouring of the heating tube head. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the overall structure of a device for improving uniform film distribution on an evaporator. Figure 1 .

[0013] Figure 2 This is a schematic diagram of the overall structure of a device for improving uniform film distribution on an evaporator. Figure 2 .

[0014] Figure 3 This is a schematic diagram of the overall structure of a device for improving uniform film distribution on an evaporator. Figure 3 .

[0015] Figure 4 This is a schematic diagram of the connection between the protection device and the heating pipe in the present invention.

[0016] Figure 5 For this utility model Figure 3 Schematic diagram of the enlarged structure at point A in the middle.

[0017] In the figure: 1. Heating chamber; 2. Flange plate; 3. Heating tube; 4. Protective device; 41. Protective sleeve; 411. Flange; 42. Bracket; 43. Umbrella cap; 5. Steam injection pipe; 6. Drain pipe. DETAILED DESCRIPTION

[0018] The present invention will now be described in further detail with reference to the accompanying drawings, which are simplified schematic diagrams that illustrate the basic structure of the present invention in a schematic manner, and thus only show components related to the present invention.

[0019] Please refer to Figure 1-5 A device for improving uniform film distribution in an evaporator comprises a cylindrical heating chamber 1 and a flange plate 2 above the heating chamber 1. A steam injection pipe 5 and a drainage pipe 6 are provided on the circumference of the heating chamber 1. A plurality of heating tubes 3 are arranged in an orderly manner in the heating chamber 1. One end of the heating tube 3 extends out of the flange plate 2, and the other end extends out of the bottom end of the heating chamber 1. A protective device 4 for protecting the port of the heating tube 3 is provided on the surface of the flange plate 2.

[0020] During use, high-temperature steam is first injected into the heating chamber 1 through the steam injection pipe 5 to increase the temperature in the heating chamber 1; at this time, the mother liquid falls from above and lands on the protective device. As the mother liquid increases, the mother liquid level on the flange plate 2 will continue to rise, and eventually the mother liquid will overflow the heating tube 3 and flow downward along the inner wall of the heating tube 3 until it flows out of the heating chamber 1; since there is high-temperature steam in the heating chamber 1, the mother liquid can be exchanged through heat transfer, which is highly practical, and the condensed water formed after the heat exchange is eventually discharged from the drain pipe 6.

[0021] In this embodiment, the protective device 4 includes a protective sleeve 41 and an umbrella cap 43. The bottom end of the protective sleeve 41 is fixed on the flange plate 2. The protective sleeve 41 and the umbrella cap 43 are fixedly connected by a bracket 42. The heating tube 3 is fixed to the inner wall of the protective sleeve 41, and the material overflows the protective sleeve 41 and enters the heating tube 3.

[0022] The outer diameter of the umbrella cap 43 is larger than the outer diameter of the protective sleeve 41 , so as to prevent the mother liquid falling from above from directly entering the heating tube 3 , thereby improving the heat exchange effect.

[0023] In addition, a flange 411 extending toward the axis is provided at the upper end of the protective sleeve 41, and the heating tube 3 is fixed directly below the flange 411. The inner diameter of the flange 411 is consistent with the inner diameter of the heating tube 3, and the material overflows the flange and flows downward along the inner wall of the heating tube 3.

[0024] Please refer again Figure 4 When the mother liquid overflows the flange 411, it will flow downward along the inner wall of the heating tube 3. Since the circumferential temperature of the heating tube 3 is higher than the temperature inside the tube, flowing along the inner wall will greatly improve the heat exchange effect; at the same time, the establishment of the flange 411 and the umbrella cap can also prevent the mother liquid from directly flushing the port of the heating tube 3, thereby protecting the tube head.

[0025] As a preferred solution, the heights of the brackets 42 in each two adjacent rows are inconsistent to avoid excessive splashing of the mother liquid when it is poured down.

[0026] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A device for improving uniform film distribution in an evaporator, comprising a cylindrical heating chamber and a flange plate above the heating chamber, wherein a steam injection pipe and a drain pipe are provided on the circumference of the heating chamber, characterized in that: A plurality of heating tubes are arranged in order in the heating chamber, one end of the heating tube extends out of the flange plate, and the other end extends out of the bottom end of the heating chamber. A protective device for protecting the heating tube port is provided on the surface of the flange plate.

2. The device for improving uniform film distribution of an evaporator according to claim 1, characterized in that: The protective device includes a protective sleeve and an umbrella cap. The bottom end of the protective sleeve is fixed on the flange plate. The protective sleeve and the umbrella cap are fixedly connected by a bracket. The heating tube is fixed on the inner wall of the protective sleeve. The material overflows the protective sleeve and enters the heating tube.

3. The device for improving uniform film distribution of an evaporator according to claim 2, characterized in that: The upper end of the protective sleeve is provided with a flange extending toward the axis, the heating tube is fixed directly below the flange, the inner diameter of the flange is consistent with the inner diameter of the heating tube, and the material overflows the flange and flows downward along the inner wall of the heating tube.

4. The device for improving uniform film distribution of an evaporator according to claim 3, characterized in that: The heights of the brackets in each two adjacent rows are inconsistent.

5. The device for improving uniform film distribution of an evaporator according to claim 4, characterized in that: The outer diameter of the umbrella cap is greater than the outer diameter of the protective sleeve.

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