Formaldehyde gas absorber

Abstract

The utility model discloses a formaldehyde gas absorber which comprises a shell and a demister, the interior of the shell is of a hollow structure, a drainage groove is formed in the inner side wall of the shell and is of a spiral structure, one end of the bottom of the drainage groove extends to the peripheral side of the shell and is provided with a gas inlet pipe, and the gas inlet pipe is used for being connected with a gas outlet of a formaldehyde evaporator; the demister is of a barrel structure, one end of the demister is connected with the bottom end of the inner wall of the shell, and the other end of the demister extends to the side close to the top end of the inner wall of the shell. A boss is spirally arranged on the peripheral side of the demister, the side, away from the demister, of the boss is connected with the inner wall of the shell and located on the side above the drainage groove, and a spiral air cavity is formed between the periphery of the demister and the opposite face of the drainage groove; the flow path of the air / methanol mixed gas is prolonged through the spiral air cavity, so that the effective contact area of the air / methanol mixed gas and the demister is increased, the mounting volume of the demister is reduced, and the production input cost of the evaporator body is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of formaldehyde production and relates to a formaldehyde gas absorber. Background Art

[0002] At present, the commonly used method for preparing formaldehyde is the methanol air oxidation method. For example, a formaldehyde evaporator disclosed in the existing Chinese utility model patent with the publication number of CN218653000U is used. Methanol liquid is injected into the evaporator body through the liquid inlet, and the air pipe joint is connected to the air pump. When the air pump works, air is discharged through multiple outlet ends of the air distributor, thereby stirring methanol to the bottom of the evaporator body. The air rises and passes through the small holes of the sieve plate to form bubbles, and then rises to the inside of the evaporation chamber through the tubes of the array tubes. Hot desalted water from the cooling section of the oxidizer is injected into the array tubes through the water inlet joint to heat the array tubes. The methanol in the array tubes is stirred by the air from the lower end, and the methanol liquid molecules diffuse into the air bubbles and are carried out of the heating tube by the bubbles. The methanol vapor carried out forms an air / methanol mixed gas in the evaporation chamber. The gas continues to rise and is removed from the spherical demister and the baffle demister to remove the entrained methanol liquid and is output from the upper port. The temperature of the methanol liquid in the evaporator body does not reach the boiling point of methanol, and the formaldehyde is lower than the boiling point of methanol, thereby discharging the formaldehyde in the methanol liquid.

[0003] However, in the above-mentioned process, the gas flow rate discharged from the evaporator body is too fast, and the methanol liquid cannot be effectively removed by a single-structure demister. If the spherical demister and the baffle demister are superimposed for filtration, the installation volume of the demister will be at least doubled, thereby increasing the production input cost of the evaporator body. Utility Model Content

[0004] In view of this, the purpose of the utility model is to provide a formaldehyde gas absorber to solve the technical problems mentioned in the prior art.

[0005] A formaldehyde gas absorber, comprising:

[0006] A shell, wherein the interior of the shell is a hollow structure, a drainage groove is arranged on the inner side wall of the shell, and the drainage groove is a spiral structure, and one end of the bottom of the drainage groove penetrates the inner wall of the shell along the axial direction and extends to the outer peripheral side of the shell to be installed with an air inlet pipe, and the air inlet pipe is used to be connected to the air outlet of the formaldehyde evaporator;

[0007] A demister, wherein the demister is a cylindrical structure, one end of the demister is connected to the bottom end of the inner wall of the shell, and the other end of the demister extends to a side close to the top end of the inner wall of the shell;

[0008] A boss is spirally arranged on the outer periphery of the demister, the boss is connected to the inner wall of the shell at a side away from the demister and is located above the drainage groove, forming a spiral air cavity between the outer periphery of the demister and the opposite surface of the drainage groove;

[0009] The top of the boss is an annular structure, which is used to seal the top of the spiral air cavity.

[0010] Optionally, an air collecting pipe is provided on the top of the shell, and one end of the air collecting pipe passes through the outer circumference of the shell and extends to the inner circumference side of the demister.

[0011] Optionally, the outer diameter of the air collecting pipe is smaller than the inner diameter of the demister.

[0012] Optionally, the cross-section of the drainage groove is a semicircular structure.

[0013] Optionally, the bottom of the shell is a cylindrical structure, the top of the shell is an upwardly protruding hemispherical structure, and the drainage groove is arranged on the cylindrical surface of the shell.

[0014] Optionally, the top of the demister extends above the cylindrical surface of the shell, and the four sides of the top of the demister shrink toward one side close to the center line of the demister, and the outer periphery of the demister is equidistant from the inner wall of the shell.

[0015] Optionally, the mesh aperture of the boss is larger than the mesh aperture of the demister.

[0016] Optionally, a supporting frame is installed on the inner circumference of the demister.

[0017] The beneficial effects that the utility model can produce include:

[0018] The utility model provides a formaldehyde gas absorber, which can extend the flow path of the air / methanol mixture discharged from the formaldehyde evaporator by designing a spiral air cavity, thereby increasing the effective contact area between the air / methanol mixture and the demister, reducing the installation volume of the demister, and reducing the production investment cost of the evaporator body; at the same time, when the spiral air cavity is filled with the air / methanol mixture, the internal pressure gradually increases, so that the air / methanol mixture is squeezed and passes through the outer periphery of the demister and the bottom of the boss, and the methanol liquid entrained in the air / methanol mixture is removed, and the formaldehyde gas is obtained and collected on the inner periphery of the demister; and the spiral air cavity can buffer the air / methanol mixture, avoid the air / methanol mixture under high temperature and high pressure state from being directly sprayed onto the surface of the demister to cause damage, and improve the service life of the demister. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1This is a structural schematic diagram of a formaldehyde gas absorber of the utility model;

[0020] Figure 2 For the utility model Figure 1 Sectional view at AA;

[0021] In the figure: 1. shell, 2. drainage groove, 3. air inlet pipe, 4. demister, 5. boss, 6. spiral air cavity, 7. air collecting pipe, 8. supporting frame. DETAILED DESCRIPTION

[0022] The present invention is described in detail below in conjunction with the accompanying drawings and embodiments, but the present invention is not limited to these embodiments.

[0023] like Figure 1 to Figure 2 As shown, the utility model provides a formaldehyde gas absorber, including a shell 1 and a demister 4. The interior of the shell 1 is a hollow structure. A drainage groove 2 is provided on the inner wall of the shell 1. The drainage groove 2 is a spiral structure. One end of the bottom of the drainage groove 2 penetrates the inner wall of the shell 1 along the axial direction and extends to the outer peripheral side of the shell 1. An air inlet pipe 3 is installed. The air inlet pipe 3 is used to be connected to the air outlet of the formaldehyde evaporator; the demister 4 is a cylindrical structure. One end of the demister 4 is fixedly connected to the bottom end of the inner wall of the shell 1. The demister 4 The other end extends to the side of the top of the inner wall near the shell 1; a supporting frame 8 is fixedly installed on the inner peripheral side of the demister 4 to enhance the structural strength of the demister 4; a boss 5 is spirally arranged on the outer peripheral side of the demister 4, and the side of the boss 5 away from the demister 4 is tightly fitted with the inner wall of the shell 1, and is located on the upper side of the drainage groove 2, forming a spiral air cavity 6 between the outer periphery of the demister 4 and the opposite surface of the drainage groove 2; the top of the boss 5 is a ring-shaped structure, which is used to close the top of the spiral air cavity 6.

[0024] In the above, by designing the spiral air cavity 6, the flow path of the air / methanol mixture discharged from the formaldehyde evaporator can be extended, thereby increasing the effective contact area between the air / methanol mixture and the demister 4, and reducing the installation volume of the demister 4, thereby reducing the production input cost of the evaporator body; at the same time, when the spiral air cavity 6 is filled with the air / methanol mixture, the internal pressure gradually increases, so that the air / methanol mixture is squeezed and passes through the outer periphery of the demister 4 and the bottom of the boss 5, and the methanol liquid entrained in the air / methanol mixture is removed, and the formaldehyde gas is obtained and collected on the inner side of the demister 4; and the spiral air cavity 6 can play a buffering role on the air / methanol mixture, avoiding the air / methanol mixture under high temperature and high pressure state from being directly sprayed onto the surface of the demister 4 to cause damage, thereby increasing the service life of the demister 4.

[0025] Furthermore, an air collecting pipe 7 is provided on the top of the shell 1, one end of the air collecting pipe 7 passes through the outer periphery of the shell 1 and extends to the inner periphery of the demister 4; during use, the air inlet of the formaldehyde gas storage tank is connected to the air outlet end of the air collecting pipe 7, so as to store the formaldehyde gas collected on the inner periphery of the demister 4 in the formaldehyde gas storage tank; at the same time, a control valve is provided at the air outlet end of the air collecting pipe 7, which is used to seal the formaldehyde gas absorber when disassembling and installing the formaldehyde gas storage tank.

[0026] Furthermore, the outer diameter of the gas collecting pipe 7 is smaller than the inner diameter of the demister 4 , so that the formaldehyde gas passing through one side of the boss 5 can flow from the top of the demister 4 to the inner side of the demister 4 .

[0027] Furthermore, the cross-section of the drainage groove 2 is a semicircular structure, so that when the air / methanol mixture flows along the tangential direction of the drainage groove 2, part of the air / methanol mixture contacts the outer peripheral side of the demister 4 and passes through the demister 4 to remove the entrained methanol liquid to obtain formaldehyde gas, thereby collecting the formaldehyde gas in sections.

[0028] Further, the bottom of the housing 1 is a cylindrical structure, the top of the housing 1 is an upwardly protruding hemispherical structure, and the drainage groove 2 is provided on the cylindrical surface of the housing 1, and the air / methanol mixture flows out along the drainage groove 2 and after the methanol liquid is removed by the demister 4, the formaldehyde gas is collected to the top center of the housing 1, so as to facilitate the drainage of the formaldehyde gas to the gas collecting pipe 7 for absorption and storage. In the above, the top of the demister 4 extends to the top of the cylindrical surface of the housing 1, and the top of the demister 4 is respectively contracted toward the side of the center line close to the demister 4, and the outer periphery of the demister 4 is equidistantly arranged with the inner wall of the housing 1, so as to form an annular guide groove on the side of the top of the housing 1 close to the demister 4, which plays a role in guiding and draining the formaldehyde gas. Specifically, the mesh aperture of the boss 5 is larger than the mesh aperture of the demister 4, so that most of the air / methanol mixture passes through the top of the boss 5, thereby ensuring that the air / methanol mixture can effectively flow in the spiral air cavity 6.

[0029] The above are only several embodiments of the utility model, and do not limit the utility model in any form. Although the utility model is disclosed as above in the preferred embodiments, it is not used to limit the utility model. Any technician familiar with this profession, without departing from the scope of the technical solution of the utility model, makes slight changes or modifications using the technical contents disclosed above, which are equivalent to equivalent implementation cases and fall within the scope of the technical solution.

Claims

1. A formaldehyde gas absorber, characterized in that: include: A shell (1), the interior of the shell (1) is a hollow structure, a drainage groove (2) is arranged on the inner side wall of the shell (1), the drainage groove (2) is a spiral structure, one end of the bottom of the drainage groove (2) penetrates the inner wall of the shell (1) along the axial direction, and extends to the outer peripheral side of the shell (1) to be installed with an air inlet pipe (3), the air inlet pipe (3) is used to be connected to the air outlet of the formaldehyde evaporator; A demister (4), the demister (4) being a cylindrical structure, one end of the demister (4) being connected to the bottom end of the inner wall of the shell (1), and the other end of the demister (4) extending to a side close to the top end of the inner wall of the shell (1); A boss (5) is spirally arranged on the outer periphery of the demister (4); the boss (5) is connected to the inner wall of the shell (1) at a side away from the demister (4) and is located above the drainage groove (2); a spiral air cavity (6) is formed between the outer periphery of the demister (4) and the opposite surface of the drainage groove (2); The top of the boss (5) is an annular structure, which is used to seal the top of the spiral air cavity (6).

2. A formaldehyde gas absorber according to claim 1, characterized in that: An air collecting pipe (7) is arranged on the top of the shell (1), and one end of the air collecting pipe (7) passes through the outer periphery of the shell (1) and extends to the inner periphery of the demister (4).

3. A formaldehyde gas absorber according to claim 2, characterized in that: The outer diameter of the gas collecting pipe (7) is smaller than the inner diameter of the demister (4).

4. A formaldehyde gas absorber according to claim 1, characterized in that: The cross section of the drainage groove (2) is a semicircular structure.

5. A formaldehyde gas absorber according to claim 1, characterized in that: The bottom of the shell (1) is a columnar structure, the top of the shell (1) is an upwardly protruding hemispherical structure, and the drainage groove (2) is arranged on the columnar surface of the shell (1).

6. A formaldehyde gas absorber according to claim 5, characterized in that: The top of the demister (4) extends to above the cylindrical surface of the shell (1), and the four sides of the top of the demister (4) are respectively contracted towards a side close to the center line of the demister (4), and the outer periphery of the demister (4) is equidistant from the inner wall of the shell (1).

7. A formaldehyde gas absorber according to claim 1, characterized in that: The mesh aperture of the boss (5) is larger than the mesh aperture of the demister (4).

8. A formaldehyde gas absorber according to claim 1, characterized in that: A supporting frame (8) is installed on the inner peripheral side of the demister (4).

Images