Exhaust gas emission and collection pipeline system of polyimide film drying furnace

Abstract

The utility model belongs to the technical field of drying ovens, and particularly relates to a waste gas discharging and collecting pipeline system of a polyimide film drying oven. The device comprises a main exhaust pipe, an igniter and a gas nozzle are arranged at an outlet of the main exhaust pipe, and a combustible gas concentration detection module is arranged in the middle section of the main exhaust pipe; the drying furnace collecting pipe comprises a horizontal pipe, an upper pipeline and a plurality of lower pipelines, the upper pipeline is mounted on the top surface of the horizontal pipe and is communicated with the horizontal pipe and the exhaust manifold, and the lower pipelines are mounted on the side surface of the horizontal pipe and are respectively communicated with the top surfaces of the front section, the middle section and the rear section of the drying furnace; a valve is arranged in each lower pipeline; heat insulation layers are arranged on the outer surfaces of the exhaust main pipe and the drying furnace collecting pipe. The utility model is used for solving the technical problem of how to improve the concentration of waste gas in the exhaust pipeline so as to achieve the purposes of reducing the fuel gas consumption and maintaining the combustion.

Description

Technical Field

[0001] The utility model belongs to the technical field of drying furnaces, and in particular relates to an exhaust gas emission and collection pipeline system for a polyimide film drying furnace. Background Art

[0002] The production process of polyimide film includes a drying step, which primarily removes solvents and promotes the drying and curing of the film. Exhaust gases generated during this drying process typically include dimethylacetamide, non-methane hydrocarbons, and water vapor.

[0003] In the existing technology, adsorption, combustion, and biodegradation methods are generally used for this type of waste gas. Among them, the combustion method is the most commonly used and is suitable for this type of waste gas that does not contain sulfur, phosphorus, or halogens. The products after combustion have basically no impact on the environment. However, the disadvantage of the combustion method is that the concentration of combustible gas in the waste gas is not high enough to be continuously ignited, and continuous addition of gas is required to maintain combustion. There are two main reasons for the low concentration of combustible gas in the waste gas. First, the temperature of the dimethylacetamide in the waste gas drops after passing through a long-distance transmission pipeline and it re-liquefies into a liquid. Second, the concentration of the waste gas generated by the polyimide film in the drying furnace is unevenly distributed. Generally, the waste gas concentration in the middle section is high, the waste gas in the rear section is second, and the waste gas in the front section is the lowest. At the same time, sucking the waste gas from the front and rear sections of the drying furnace in equal amounts will actually lower the concentration of the combustible gas in the waste gas. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the shortcomings of the existing technology and provide a polyimide film drying furnace exhaust gas emission collection pipeline system, which is used to solve the technical problem of how to increase the exhaust gas concentration in the exhaust pipeline to achieve the purpose of reducing gas consumption and maintaining combustion.

[0005] The utility model solves the above technical problems with the following technical solutions: A polyimide film drying furnace exhaust gas emission collection pipeline system, comprising:

[0006] An exhaust manifold, wherein an igniter and a gas nozzle are provided at the outlet of the exhaust manifold, and a combustible gas concentration detection module is provided in the middle section of the exhaust manifold;

[0007] At least one drying furnace manifold, the drying furnace manifold comprising a horizontal pipe, an upper pipe, and a plurality of lower pipes, the upper pipe being mounted on the top surface of the horizontal pipe and communicating with the horizontal pipe and the exhaust manifold, the plurality of lower pipes being mounted on the side surfaces of the horizontal pipe and communicating with the top surfaces of the front, middle, and rear sections of the drying furnace, respectively;

[0008] Each of the lower pipes is provided with a valve;

[0009] The outer surfaces of the exhaust main pipe and the drying furnace manifold are both provided with a heat insulation layer.

[0010] The utility model addresses the problem that dimethylacetamide in the exhaust gas is easily liquefied. The utility model maintains the temperature in the exhaust and collection pipeline system through a heat insulation layer, so that the dimethylacetamide is in a gaseous state. Secondly, the exhaust gas concentration is adjusted by adjusting the opening of the valves of each lower pipeline. That is, if the exhaust gas concentration in the middle section of the drying furnace is high, the opening of the valve in the corresponding lower pipeline is the largest. In this way, it is ensured that the contents of dimethylacetamide and non-methane total hydrocarbons in the exhaust gas of the exhaust main pipe can be maintained at a high state.

[0011] Furthermore: the upper pipeline includes:

[0012] a first pipe, wherein the bottom of the first pipe is in a closed state;

[0013] A second pipe is connected to the lower side of the first pipe.

[0014] The beneficial effect of adopting this step is: there is a height difference between the lower edge of the second pipe and the bottom of the first pipe, and the bottom of the first pipe is in a closed state, thus forming a cavity. This cavity has two functions: one is to store liquefied dimethylacetamide in the exhaust gas, and the other is to store rainwater entering from the exhaust main pipe on rainy days to prevent it from entering the drying furnace.

[0015] Furthermore: an axial flow fan is provided in the exhaust main pipe, and the air outlet of the axial flow fan faces upward.

[0016] The beneficial effect of adopting this step is that the axial flow fan can increase the flow rate of the exhaust gas.

[0017] Furthermore: a rainproof cap is also provided on the top of the exhaust manifold.

[0018] The beneficial effect of adopting this step is that the rain cap can prevent a large amount of rainwater from entering the exhaust main pipe.

[0019] Furthermore: the valve is a shutter-type valve.

[0020] The beneficial effect of adopting this step is that the shutter valve can adjust the opening more accurately.

[0021] The beneficial effects of the utility model are:

[0022] 1. This application uses a drying furnace manifold to collect the exhaust gas from each section of the drying furnace into the exhaust main pipe, and then uses the valves of each lower pipe to adjust the output of the exhaust gas from each section of the drying furnace, so that as much exhaust gas from the middle section of the drying furnace as possible enters the exhaust main pipe, thereby increasing the content of gases such as dimethylacetamide in the exhaust gas, which is more conducive to the combustion of the exhaust gas;

[0023] 2. The heat insulation layer on the outer surface of the exhaust main pipe and the drying furnace manifold in this application can prevent the temperature inside the pipe from decreasing, allowing dimethylacetamide and the like to be in a gaseous state, making it easier to burn. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 This is a structural diagram of a waste gas emission and collection pipeline system for a polyimide film drying furnace provided by the utility model;

[0026] Figure 2 This is a structural schematic diagram of a drying furnace manifold in an exhaust gas emission collection pipeline system of a polyimide film drying furnace provided by the utility model.

[0027] Reference numerals:

[0028] 1-Exhaust main pipe; 2-Drying furnace manifold; 3-Rainproof cap;

[0029] 21-upper pipe; 22-horizontal pipe; 23-lower pipe;

[0030] 211-first pipeline; 212-second pipeline. DETAILED DESCRIPTION

[0031] The following embodiments of the technical solution of the present invention are described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are therefore only examples and are not intended to limit the scope of protection of the present invention.

[0032] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which this utility model belongs.

[0033] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and 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, and therefore should not be understood as a limitation on the present invention.

[0034] In addition, the terms "first," "second," etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of this utility model, "plurality" means more than two, unless otherwise specifically defined.

[0035] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; they can refer to direct connection or indirect connection through an intermediate medium; they can refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0036] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0037] Example

[0038] like Figure 1 and Figure 2 As shown, the utility model provides a polyimide film drying furnace exhaust gas emission collection pipeline system, comprising:

[0039] The exhaust manifold 1 and the outlet of the exhaust manifold 2 are provided with an igniter and a gas nozzle, and the middle section of the exhaust manifold 1 is provided with a combustible gas concentration detection module, which is used to detect the content of combustible gas (i.e., dimethylacetamide and non-methane total hydrocarbons, the same below) in the exhaust gas. When the combustible gas in the exhaust gas is insufficient, the gas nozzle sprays gas to maintain continuous combustion at the top of the exhaust manifold 1;

[0040] At least one drying furnace manifold 2, the drying furnace manifold 2 comprising a horizontal pipe 22, an upper pipe 21, and a plurality of lower pipes 23, the upper pipe 21 being mounted on the top surface of the horizontal pipe 22 and communicating with the horizontal pipe 22 and the exhaust manifold 1, the plurality of lower pipes 23 being mounted on the side surfaces of the horizontal pipe 22 and communicating with the top surfaces of the front, middle, and rear sections of the drying furnace, respectively;

[0041] Each of the lower pipes 23 is provided with a valve, the opening of which can be adjusted according to the pressure gauge, component detector, etc. in the drying furnace;

[0042] The outer surfaces of the exhaust main pipe 1 and the drying furnace manifold 2 are both provided with a heat-insulating layer, which is generally wrapped with heat-insulating cotton or filled with materials with poor thermal conductivity.

[0043] This utility model addresses the problem of dimethylacetamide in waste gas being easily liquefied. By using an insulating layer to maintain the temperature within the discharge and collection piping system, the dimethylacetamide remains in a gaseous state. Furthermore, the exhaust gas concentration is regulated by adjusting the opening of the valves in each lower pipe. Specifically, if the exhaust gas concentration in the middle section of the drying furnace is high, the valve opening in the corresponding lower pipe is maximized. This ensures that the contents of dimethylacetamide and non-methane hydrocarbons in the exhaust gas from the exhaust manifold remain high. This reduces gas usage, as gas only needs to be used when the combustible gas content in the exhaust gas is low.

[0044] On the basis of the above technical solution, the upper pipeline 21 includes:

[0045] A first pipe 211, wherein the bottom of the first pipe 211 is in a closed state;

[0046] The second pipe 212 is connected to the lower side of the first pipe 211.

[0047] There's a height difference between the lower edge of the second pipe 212 and the bottom of the first pipe 211, and the bottom of the first pipe 211 is closed, creating a cavity. This cavity has two functions: first, it can store liquefied dimethylacetamide in the exhaust gas, and second, it can store rainwater that enters through the exhaust manifold 1 on rainy days, preventing it from entering the drying oven. This cavity only needs to be regularly disassembled and cleaned.

[0048] On the basis of the above technical solution, an axial flow fan is provided in the exhaust main pipe 1, and the air outlet of the axial flow fan faces upward.

[0049] Axial flow fans can increase the flow rate of exhaust gas.

[0050] On the basis of the above technical solution, a rainproof cap 3 is further provided on the top of the exhaust manifold 1 .

[0051] The rainproof cap 3 can prevent a large amount of rainwater from entering the exhaust main pipe 1.

[0052] On the basis of the above technical solution, the valve is a shutter-type valve.

[0053] The shutter-type valve can adjust the opening more precisely and can more accurately control the exhaust gas containing more combustible gases to enter the exhaust system.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A polyimide film drying furnace exhaust gas emission collection pipeline system, characterized in that: include: An exhaust manifold, wherein an igniter and a gas nozzle are provided at the outlet of the exhaust manifold, and a combustible gas concentration detection module is provided in the middle section of the exhaust manifold; At least one drying furnace manifold, the drying furnace manifold comprising a horizontal pipe, an upper pipe, and a plurality of lower pipes, the upper pipe being mounted on the top surface of the horizontal pipe and communicating with the horizontal pipe and the exhaust manifold, the plurality of lower pipes being mounted on the side surfaces of the horizontal pipe and communicating with the top surfaces of the front, middle, and rear sections of the drying furnace, respectively; Each of the lower pipes is provided with a valve; The outer surfaces of the exhaust main pipe and the drying furnace manifold are both provided with a heat insulation layer.

2. The polyimide film drying furnace exhaust gas emission collection pipeline system according to claim 1, characterized in that: The upper pipeline comprises: a first pipe, wherein the bottom of the first pipe is in a closed state; A second pipe is connected to the lower side of the first pipe.

3. The polyimide film drying furnace exhaust gas emission collection pipeline system according to claim 1, characterized in that: An axial flow fan is provided in the exhaust main pipe, and the air outlet of the axial flow fan faces upward.

4. The polyimide film drying furnace exhaust gas emission collection pipeline system according to claim 1, characterized in that: The top of the exhaust manifold is also provided with a rainproof cap.

5. The polyimide film drying furnace exhaust gas emission collection pipeline system according to claim 1, characterized in that: The valve is a shutter valve.

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