Tail gas treatment system of polyimide film production line

Abstract

The tail gas treatment system comprises a gas inlet pipe, a heat exchange structure, a gas guide pipe, an induced draft fan, a spray tower and an adsorption tank, the front end of the gas inlet pipe is communicated with a tail gas outlet of the film production line, the heat exchange structure is arranged outside the gas inlet pipe, and the rear end of the gas inlet pipe is communicated with the gas guide pipe; an induced draft fan is arranged on the gas guide pipe, and the tail end of the gas guide pipe is communicated with the spray tower. The tail gas treatment system integrates the heat exchange structure, the spray tower and the adsorption tank, firstly, the heat exchange structure is used for carrying out heat exchange on tail gas with heat, then the induced draft fan is used for leading in cold tail gas, cold air enters the adsorption tank after being sprayed by the spray tower, and the adsorption tank adopts adsorption particles to be stacked to form an adsorption layer. And when the adsorption particles need to be replaced, the steel rope is wound by the winder, and the switching baffle is moved downwards, so that the adsorption particles are discharged from the discharging opening, and the use is convenient and rapid.

Description

Technical Field

[0001] The utility model relates to the field of polyimide film production, in particular to an exhaust gas treatment system for a polyimide film production line. Background Art

[0002] Polyimide, a high-performance material with excellent properties such as high-temperature resistance, corrosion resistance, radiation resistance, and high strength, is widely used in the production of thin films. The production of polyimide films produces a number of harmful exhaust gases, particularly during the salivation process and the high-temperature imidization process, which produces a mixed exhaust gas containing dimethylacetamide (DMAC) solvent. This DMAC solvent exhaust is a low-toxic, highly irritating gas. Directly released into the atmosphere, it can pollute the air and soil. Furthermore, the polyimide production process produces a variety of harmful gases, which are extremely harmful to the environment.

[0003] At present, most polyimide film production lines are equipped with a unified exhaust gas treatment system to treat production exhaust gas. The exhaust gas treatment system generally includes a spraying device and an adsorption device. The main function of the spraying device is to remove dust and some impurities in the exhaust gas by spraying, while the adsorption device is to adsorb harmful substances by physical adsorption. Most of the current adsorption equipment uses an adsorption filter layer. Although the adsorption filter layer is easy to replace, its contact area with the exhaust gas is small, resulting in incomplete exhaust gas adsorption. Based on this, the utility model proposes an exhaust gas treatment system for a polyimide film production line. The exhaust gas treatment system integrates a heat exchange structure, a spray tower and an adsorption tank. First, the heat exchange structure is used to exchange heat with the hot exhaust gas. Then, the induced draft fan is used to introduce the cold exhaust gas. The cold exhaust gas is sprayed by the spray tower and then enters the adsorption tank. The adsorption tank uses adsorption particles to accumulate to form an adsorption layer, which is more fully in contact with the cold exhaust gas. When the adsorption particles need to be replaced, it is only necessary to wind the steel cable through the winder and move the switch baffle downward to allow the adsorption particles to be discharged from the discharge port. It is convenient and quick to use. Utility Model Content

[0004] The purpose of the utility model is to provide an exhaust gas treatment system for a polyimide film production line to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an exhaust gas treatment system for a polyimide film production line, comprising an air intake pipe, a heat exchange structure, an air guide pipe, an induced draft fan, a spray tower and an adsorption tank, wherein the front end of the air intake pipe is connected to the exhaust gas outlet of the film production line, a heat exchange structure is arranged outside the air intake pipe, and the rear end of the air intake pipe is connected to the air guide pipe; an induced draft fan is arranged on the air guide pipe, and the end of the air guide pipe is connected to the spray tower; a multi-stage spray assembly is arranged in the spray tower, and the top side of the spray tower is connected to the adsorption tank through a pipeline; the adsorption tank has a tank body, a switching baffle arranged in the tank body, and adsorption particles filled in the tank body for adsorbing impurities; discharge ports are provided on both sides of the tank body, and an air outlet is provided at the bottom of the tank body. The switching baffle is arched and has a number of air holes arranged on it, and the bottom ends of both sides of the switching baffle are connected to the inner wall of the tank body through elastic parts.

[0006] Preferably, the air guide pipe is arranged in a long U shape, and the air guide pipe gradually expands toward the inner wall of one end of the spray tower.

[0007] Preferably, a bracket support is provided on the bottom side of the heat exchange structure, and the heat exchange structure is a heat exchange tube with an insulation layer on the outside and a spiral heat exchange layer on the inside.

[0008] Preferably, the adsorption particles are filled on the switching baffle, and the diameter of the adsorption particles is larger than the diameter of the air holes on the switching baffle.

[0009] Preferably, a winder is provided at the bottom of the adsorption tank, on which a steel cable is wound. The steel cable extends into the adsorption tank and is connected to the middle of the switching baffle. The winder can wind the steel cable and move the switching baffle downward so that the adsorption particles can be discharged and replaced from the discharge port.

[0010] Compared with the prior art, the beneficial effects of the present invention are:

[0011] The exhaust gas treatment system of the present invention integrates a heat exchange structure, a spray tower and an adsorption tank. First, the heat exchange structure is used to exchange heat with the hot exhaust gas, and then the cold exhaust gas is introduced by the induced draft fan. The cold air enters the adsorption tank after being sprayed by the spray tower. The adsorption tank uses adsorption particles to accumulate to form an adsorption layer, which has more sufficient contact with the cold exhaust gas. When the adsorption particles need to be replaced, it is only necessary to wind the steel cable through the winder and move the switching baffle downward to allow the adsorption particles to be discharged from the discharge port. It is convenient and quick to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural diagram of the utility model;

[0013] Figure 2 This is a schematic diagram of the internal structure of the adsorption tank of the utility model.

[0014] In the figure: 1. Air inlet pipe; 2. Air guide pipe; 3. Induced draft fan; 4. Spray tower; 5. Adsorption tank; 6. Switching baffle; 7. Discharge port; 8. Elastic part; 9. Bracket; 10. Winder; 11. Steel cable. DETAILED DESCRIPTION

[0015] 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.

[0016] In the description of the present invention, it should be noted that the terms "vertical", "up", "down", "horizontal", etc. indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0017] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0018] See also Figure 1-2 The utility model provides a technical solution: an exhaust gas treatment system for a polyimide film production line, comprising an air intake pipe 1, a heat exchange structure, an air guide pipe 2, an induced draft fan 3, a spray tower 4 and an adsorption tank 5, wherein the front end of the air intake pipe 1 is connected to the exhaust gas outlet of the film production line, a heat exchange structure is arranged outside the air intake pipe 1, and the rear end of the air intake pipe 1 is connected to the air guide pipe 2; the air guide pipe 2 is provided with an induced draft fan 3, and the end of the air guide pipe 2 is connected to the spray tower 4; a multi-stage spray assembly is provided in the spray tower 4, and the top side of the spray tower 4 is connected to the adsorption tank 5 through a pipeline; the adsorption tank 5 comprises a tank body, a switching baffle 6 arranged in the tank body, and adsorption particles filled in the tank body for adsorbing impurities; discharge ports 7 are provided on both sides of the tank body, an air outlet is provided at the bottom of the tank body, the switching baffle 6 is arched and has a plurality of air holes arranged on it, and the bottom ends of the switching baffle 6 are connected to the inner wall of the tank body through elastic members 8.

[0019] In this embodiment, the air guide pipe 2 is arranged in a long U shape, and the inner wall of one end of the air guide pipe 2 toward the spray tower 4 gradually expands.

[0020] In this embodiment, a bracket 9 is provided on the bottom side of the heat exchange structure for support. The heat exchange structure is a heat exchange tube with an insulation layer on the outside and a spiral heat exchange layer on the inside.

[0021] In this embodiment, the adsorption particles are filled on the switch baffle 6 , and the diameter of the adsorption particles is larger than the diameter of the air holes on the switch baffle 6 .

[0022] In this embodiment, a winder 10 is provided at the bottom end of the adsorption tank 5, and a steel cable 11 is wound on the winder 10. The steel cable 11 extends into the adsorption tank 5 and is connected to the middle of the switching baffle 6. The winder 10 can wind the steel cable 11 and move the switching baffle 6 downward so that the adsorbed particles can be discharged and replaced from the discharge port 7.

[0023] The above-mentioned exhaust gas treatment system integrates a heat exchange structure, a spray tower 4 and an adsorption tank 5. First, the heat exchange structure is used to exchange heat with the hot exhaust gas, and then the induced draft fan 3 is used to introduce the cold exhaust gas. The cold air enters the adsorption tank 5 after being sprayed by the spray tower 4. The adsorption tank 5 uses adsorption particles to accumulate to form an adsorption layer, which is in more complete contact with the cold exhaust gas. When the adsorption particles need to be replaced, it is only necessary to wind the steel cable 11 through the winder 10 and move the switching baffle 6 downward to allow the adsorption particles to be discharged from the discharge port 7. It is convenient and quick to use.

[0024] It is worth noting that the entire device is controlled by a master control button. Since the devices matched with the control button are commonly used devices and belong to existing mature technologies, their electrical connection relationships and specific circuit structures will not be described in detail here.

[0025] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A tail gas treatment system for a polyimide film production line, characterized in that: The invention comprises an air inlet pipe (1), a heat exchange structure, an air guide pipe (2), an induced draft fan (3), a spray tower (4) and an adsorption tank (5), wherein the front end of the air inlet pipe (1) is connected to the tail gas outlet of the film production line, the heat exchange structure is arranged outside the air inlet pipe (1), and the rear end of the air inlet pipe (1) is connected to the air guide pipe (2); the air guide pipe (2) is provided with an induced draft fan (3), and the end of the air guide pipe (2) is connected to the spray tower (4); a multi-stage spray assembly is arranged in the spray tower (4), and the top side of the spray tower (4) is connected to the adsorption tank (5) through a pipeline; the adsorption tank (5) comprises a tank body, a switching baffle (6) arranged in the tank body, and adsorption particles filled in the tank body for adsorbing impurities; discharge ports (7) are arranged on both sides of the tank body, an air outlet is arranged at the bottom of the tank body, the switching baffle (6) is arched and has a plurality of air holes arranged thereon, and the bottom ends of both sides of the switching baffle (6) are connected to the inner wall of the tank body through elastic members (8).

2. The tail gas treatment system for a polyimide film production line according to claim 1, characterized in that: The air guide pipe (2) is arranged in a long U-shape, and the air guide pipe (2) gradually expands toward the inner wall of one end of the spray tower (4).

3. The tail gas treatment system for a polyimide film production line according to claim 1, characterized in that: A bracket (9) is provided on the bottom side of the heat exchange structure for support, and the heat exchange structure is a heat exchange tube having an insulation layer on the outside and a spiral heat exchange layer on the inside.

4. The tail gas treatment system for a polyimide film production line according to claim 1, characterized in that: The adsorption particles are filled on the switching baffle (6), and the diameter of the adsorption particles is larger than the diameter of the air holes on the switching baffle (6).

5. The tail gas treatment system for a polyimide film production line according to claim 1, characterized in that: A winder (10) is provided at the bottom end of the adsorption tank (5). A steel cable (11) is wound around the winder (10). The steel cable (11) extends into the adsorption tank (5) and is connected to the middle of the switching baffle (6). The winder (10) can wind up the steel cable (11) and move the switching baffle (6) downward, so that the adsorbed particles can be discharged and replaced from the discharge port (7).

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