Formaldehyde production evaporator

Abstract

A formaldehyde production evaporator comprises an evaporation tank, a heating assembly is arranged on the inner wall of the evaporation tank and is an electric heating net, an air outlet pipe is arranged on one side of the top of the evaporation tank, a liquid discharging pipe is arranged on one side of the bottom of the evaporation tank, a driving motor is arranged at the bottom of the evaporation tank, and the output end of the driving motor is connected with a rotating shaft. The rotating shaft vertically extends into the evaporation tank, a spiral fan blade is fixed to the outer wall of the rotating shaft, a liquid inlet pipe is arranged at the top of the evaporation tank, and the liquid inlet pipe extends into the evaporation tank and is located above the spiral fan blade. According to the formaldehyde production evaporator, the spiral fan blades are arranged, formaldehyde liquid is conveyed to the tops of the spiral fan blades through the liquid inlet pipe, the liquid flows in the spiral direction of the spiral fan blades, and meanwhile the spiral fan blades rotate to generate centrifugal force so that the liquid can be evenly distributed on the inner walls of the evaporation tanks at different heights and evaporation can be achieved; therefore, the separation effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of formaldehyde production equipment, in particular to a formaldehyde production evaporator. Background Art

[0002] Formaldehyde is an organic chemical substance that is widely used in modern industrial production. Formaldehyde is prepared from methanol.

[0003] In the formaldehyde production process, an evaporator is required to heat methanol to separate formaldehyde gas. In order to improve the separation effect, Chinese patent application number CN202220780171.0 discloses a formaldehyde evaporator for producing formaldehyde. The device uses a rotatable distribution plate to generate centrifugal force to evenly distribute methanol liquid on the inner wall of the inner tank body, thereby improving the separation of formaldehyde vapor and effectively improving the production efficiency of formaldehyde. However, the following defects still exist: during separation, the liquid is thrown to the inner wall of the tank body through the umbrella-shaped distribution plate for evaporation. This area is a fixed area with limitations, that is, the liquid cannot be evenly distributed on the inner wall of the tank body below the umbrella-shaped distribution plate by centrifugal means, but is centrifugally distributed on the inner wall of the tank body through the distribution plate and then flows to the inner wall of the tank body below the umbrella-shaped distribution plate for evaporation and separation, affecting the separation effect. Utility Model Content

[0004] The utility model aims to provide a formaldehyde production evaporator, which can evenly distribute liquid at any height, avoid limitations, and improve formaldehyde evaporation efficiency.

[0005] To achieve the above-mentioned purpose, the following technical scheme is adopted: a formaldehyde production evaporator comprises an evaporation tank, a heating component is arranged on the inner wall of the evaporation tank, the heating component is an electric heating network, an air outlet pipe is arranged on one side of the top of the evaporation tank, a liquid discharge pipe is arranged on one side of the bottom, a driving motor is arranged on the bottom of the evaporation tank, a rotating shaft is connected to the output end of the driving motor, the rotating shaft vertically extends into the evaporation tank, and spiral fan blades are fixed on the outer wall of the rotating shaft, a liquid inlet pipe is arranged on the top of the evaporation tank, the liquid inlet pipe extends into the interior of the evaporation tank and is located above the spiral fan blades.

[0006] Preferably, the angle θ between the cross section of the spiral blade along the radial direction and the horizontal plane is greater than 0 degrees, so that the spiral blade and the rotating shaft together form a spiral groove structure.

[0007] Preferably, the angle θ between the cross section of the spiral blade along the radial direction and the horizontal plane increases from bottom to top.

[0008] Preferably, the driving motor is a forward and reverse motor.

[0009] Preferably, a support frame is connected to the bottom of the evaporation tank.

[0010] Preferably, a valve is provided on the drain pipe.

[0011] Preferably, a visual window is provided on the side wall of the evaporation tank.

[0012] Beneficial effects achieved by the utility model:

[0013] Compared with the prior art, the formaldehyde production evaporator of the utility model is provided with spiral blades, and formaldehyde liquid is transported to the top of the spiral blades through a liquid inlet pipe, so that the liquid can flow along the spiral direction of the spiral blades. At the same time, the rotation of the spiral blades generates centrifugal force to evenly distribute the liquid on the inner wall of the evaporation tank at different heights and realize evaporation, thereby improving the separation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The utility model is a schematic diagram of the internal structure of a formaldehyde production evaporator.

[0015] Figure 2 This is a schematic diagram of the spiral blade structure of the utility model. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present utility model are clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present utility model, rather than all the embodiments.

[0017] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0018] See attached Figure 1-2A formaldehyde production evaporator comprises an evaporation tank 1, wherein a heating assembly 2 is arranged on the inner wall of the evaporation tank 1, wherein the heating assembly 2 is an electric heating network, wherein an air outlet pipe 3 is arranged on one side of the top of the evaporation tank 1, through which the evaporated formaldehyde is transported to external equipment, a liquid discharge pipe 4 is arranged on one side of the bottom of the evaporation tank 1, wherein a valve is arranged on the liquid discharge pipe 4, through which waste water is discharged, a driving motor 5 is arranged at the bottom of the evaporation tank 1, wherein a rotating shaft 6 is connected to the output end of the driving motor 5, wherein the rotating shaft 6 vertically extends into the evaporation tank 1, and a spiral fan blade 7 is fixed to the outer wall of the rotating shaft 6, wherein a liquid inlet pipe 8 is arranged on the top of the evaporation tank 1, wherein the liquid inlet pipe 8 extends into the interior of the evaporation tank 1 and is located above the spiral fan blade 7. When in use, the driving motor 5 is started to drive the spiral fan blades 7 to rotate, the heating component 2 is turned on, and the formaldehyde liquid is transported to the top of the spiral fan blades 7 through the liquid inlet pipe 8, so that the liquid flows along the spiral direction of the spiral fan blades 7. At the same time, the rotation of the spiral fan blades 7 generates centrifugal force to evenly distribute the liquid on the inner wall of the evaporation tank 1 at different heights and evaporate, thereby improving the separation effect.

[0019] In this embodiment, in order to make the liquid flow in the spiral direction of the spiral blade 7, the angle θ between the cross section of the spiral blade 7 in the radial direction and the horizontal plane is greater than 0 degrees, so that the spiral blade 7 and the rotating shaft 6 together form a spiral groove structure, so that the liquid can be distributed in the spiral groove structure at different heights. When the spiral blade 7 rotates, the liquid is evenly distributed on the inner wall of the evaporator 1 at different heights by centrifugal force, wherein the cross section of the spiral groove structure is a V-shaped shape that opens obliquely upward.

[0020] In this embodiment, in order to improve the uniformity of the distribution of the liquid at different heights, the angle θ between the cross section of the spiral blade 7 along the radial direction and the horizontal plane increases from bottom to top.

[0021] In this embodiment, the driving motor 5 is a forward and reverse motor. When the driving motor 5 rotates forward, the spiral fan blades 7 can evaporate and separate the formaldehyde liquid entering the liquid inlet pipe 8. When the driving motor 5 rotates reversely, the formaldehyde liquid at the bottom of the evaporation tank 1 is evaporated and separated again. Specifically, the spiral fan blades 7 are reversed to transport the formaldehyde liquid at the bottom of the evaporation tank 1 to different heights, and during the transportation process, the centrifugal force is used to achieve evaporation and separation again, thereby improving the separation effect.

[0022] A support frame 9 is connected to the bottom of the evaporation tank 1 .

[0023] In order to facilitate direct observation, a visual window is provided on the side wall of the evaporation tank 1 .

[0024] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A formaldehyde production evaporator, comprising an evaporation tank (1), wherein the inner wall of the evaporation tank (1) is provided with a heating component (2), a gas outlet pipe (3) is provided on one side of the top of the evaporation tank (1), and a liquid discharge pipe (4) is provided on one side of the bottom, wherein: A driving motor (5) is arranged at the bottom of the evaporation tank (1); an output end of the driving motor (5) is connected to a rotating shaft (6); the rotating shaft (6) vertically extends into the evaporation tank (1); and a spiral fan blade (7) is fixed to the outer wall of the rotating shaft (6); a liquid inlet pipe (8) is arranged at the top of the evaporation tank (1); the liquid inlet pipe (8) extends into the interior of the evaporation tank (1) and is located above the spiral fan blade (7).

2. A formaldehyde production evaporator according to claim 1, characterized in that: The angle θ between the cross section of the spiral blade (7) in the radial direction and the horizontal plane is greater than 0 degrees, so that the spiral blade (7) and the rotating shaft (6) together form a spiral groove structure.

3. A formaldehyde production evaporator according to claim 1, characterized in that: The angle θ between the cross section of the spiral blade (7) along the radial direction and the horizontal plane increases from bottom to top.

4. A formaldehyde production evaporator according to claim 1, characterized in that: The driving motor (5) is a forward and reverse motor.

5. A formaldehyde production evaporator according to claim 1, characterized in that: A support frame (9) is connected to the bottom of the evaporation tank (1).

6. A formaldehyde production evaporator according to claim 1, characterized in that: The liquid discharge pipe (4) is provided with a valve.

7. A formaldehyde production evaporator according to claim 1, characterized in that: The side wall of the evaporation tank (1) is provided with a visual window.

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