Flue gas emission structure for PE film production

Abstract

The utility model relates to a flue gas emission structure for PE (polyethylene) film production, which comprises a plurality of single-screw extruders distributed side by side at intervals along the longitudinal direction, the extrusion ends of the single-screw extruders are jointly connected with a distributor through pipelines, a flue gas emission box is arranged right above the distributor, and the flue gas emission box is connected with the single-screw extruders through pipelines. A plurality of flue gas discharge pipes which are distributed side by side are connected between the bottom of the flue gas discharge box and the top of the distributor, flue gas on the distributor is discharged into the flue gas discharge box through the flue gas discharge pipes, and one end of the flue gas discharge box is connected with the air inlet end of a flue gas discharge fan through an output pipe; and the flue gas in the flue gas discharge box is discharged by the flue gas discharge fan. The smoke exhaust device is reasonable in structural design, smoke generated by the multi-layer co-extrusion film production line is collected through the smoke exhaust box, then the smoke is output through the smoke exhaust fan, and the smoke generated when the single-screw extruder works is effectively prevented from polluting the working environment and affecting the body health of workers.

Description

Technical Field

[0001] This utility model relates to a flue gas emission structure for PE film production. Background Technology

[0002] PE film is the simplest structural polymer organic compound and the most widely used polymer material in the world today. The biggest advantage of PE protective film is that it protects products from pollution, corrosion, and scratches during production, processing, transportation, storage, and use, preserving their original smooth and glossy surface, thereby improving product quality and market competitiveness.

[0003] Currently, PE films are mostly produced using multi-layer co-extrusion film production lines composed of multiple single-screw extruders. However, single-screw extruders generate a small amount of flue gas during operation, which contains a large number of solid particles. Direct emission of this gas into the workshop can affect the working environment of workers and cause environmental pollution. Therefore, it is necessary to improve the aforementioned technical issues, hence this case. Utility Model Content

[0004] This utility model addresses the problems existing in the prior art by providing a reasonable flue gas emission structure for PE film production, which reduces pollution to the workshop environment.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a flue gas emission structure for PE film production, comprising multiple single-screw extruders arranged in parallel along the longitudinal direction at intervals. The extrusion ends of the single-screw extruders are connected to a distributor via pipelines. A flue gas emission box is arranged directly above the distributor. Multiple flue gas emission pipes are connected between the bottom of the flue gas emission box and the top of the distributor. The flue gas on the distributor is discharged into the flue gas emission box through the flue gas emission pipes. One end of the flue gas emission box is connected to the air inlet of a flue gas emission fan via an output pipe. The flue gas emission fan discharges the flue gas from the flue gas emission box.

[0006] Furthermore, a flue gas filter is installed at one end of the flue gas emission box near the output pipe.

[0007] Furthermore, the flue gas filter includes a plurality of filter screens spaced apart along the flue gas flow direction, and the mesh size of the plurality of filter screens decreases sequentially along the flue gas flow direction.

[0008] Furthermore, an activated carbon plate layer is provided on the side of the flue gas filter facing the output pipe.

[0009] Further, the single screw extruder has a plurality of working sections along the axial direction thereof, a plurality of protective covers are arranged outside the barrel of the single screw extruder and are spaced along the axial direction thereof, the plurality of protective covers correspond to the positions of the plurality of working sections, and the inside of each protective cover is provided with an electromagnetic coil arranged outside the working section.

[0010] Further, a plurality of cooling fans are arranged below the barrel of the single screw extruder and correspond to the positions of the plurality of protective covers, and the cooling fans are used to send air to the inside of the protective cover to blow and cool.

[0011] Further, the inside of the protective cover is provided with an annular air supply pipe, the annular air supply pipe is annularly arranged outside the working section, the lower end of the annular air supply pipe is in communication with the air outlet end of the cooling fan, the inner circumferential side wall of the annular air supply pipe is circumferentially provided with a plurality of air outlets, and the air outlets are radially arranged towards the barrel along the annular air supply pipe.

[0012] Compared with the prior art, the utility model has the following effects: the utility model discloses reasonable structure design, the flue gas generated in the multilayer co-extrusion film production line is collected through the flue gas discharge box, and then the flue gas is output through the flue gas discharge fan, so that the flue gas generated when the single screw extruder works can effectively avoid polluting the working environment and affecting the health of the workers. BRIEF DESCRIPTION OF DRAWINGS

[0013] Fig. 1 is the front view structural schematic diagram of the utility model embodiment;

[0014] Fig. 2 is the top view structural schematic diagram of the utility model embodiment;

[0015] Fig. 3 is the side view structural schematic diagram of the utility model embodiment;

[0016] Fig. 4 is the partial structural schematic diagram of the flue gas discharge box in the utility model embodiment;

[0017] Fig. 5 is the structural schematic diagram of the annular air supply pipe in the utility model embodiment. DETAILED DESCRIPTION

[0018] The utility model will be further explained in detail in combination with the drawings and specific implementation.

[0019] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] like Figs. 1-5 As shown, this utility model discloses a flue gas emission structure for PE film production, comprising multiple single-screw extruders 1 arranged longitudinally at intervals. These multiple single-screw extruders 1 work in coordination to form a multi-layer co-extrusion film production line for producing PE film. The extrusion ends of the single-screw extruders 1 are connected to a distributor 20 via pipes 19. A co-extrusion die 21 is arranged parallel to the bottom of the distributor 20, and a cooling roller 22 is arranged parallel to the bottom of the co-extrusion die 21. A flue gas emission box 23 is located directly above the distributor 20. Multiple parallel flue gas emission pipes 24 are connected between the bottom of the flue gas emission box 23 and the top of the distributor 20. Flue gas from the distributor 20 is discharged into the flue gas emission box 23 through the emission pipes 24. One end of the flue gas emission box 23 is connected to the inlet of a flue gas emission fan 26 via an outlet pipe 25. The flue gas emission fan 26 discharges the flue gas from the emission box. The outlet of the flue gas emission fan is connected to flue gas treatment equipment via a pipeline, allowing the flue gas to be treated. By collecting the flue gas generated during the multi-layer co-extrusion film production line through the flue gas emission box and then outputting it using the flue gas emission fan, the pollution of the working environment caused by the flue gas generated during the operation of the single-screw extruder and its impact on the health of the workers can be effectively avoided.

[0021] In this embodiment, a flue gas filter element 27 is provided at one end of the flue gas emission box 23 near the output pipe 25. Specifically, the flue gas filter element 27 includes a plurality of filter screens 28 spaced apart along the flue gas flow direction, and the mesh size of the plurality of filter screens 28 decreases sequentially along the flue gas flow direction.

[0022] In this embodiment, the side of the flue gas filter 27 facing the output pipe 25 is provided with an activated carbon plate layer 29 to adsorb particulate matter in the flue gas and achieve the purpose of smoke removal.

[0023] In the embodiment, the single screw extruder 1 has a plurality of working sections 12 along its axial direction, a plurality of circular protective covers 14 are arranged outside the barrel 13 of the single screw extruder 1 and are spaced along the axial direction of the barrel 13, the plurality of protective covers 14 correspond to the positions of the plurality of working sections 12, one protective cover is arranged outside each working section, and an electromagnetic coil 15 is arranged inside each protective cover 14 and surrounds the outside of the working section 12 at the corresponding position. In the working process, the electromagnetic coil is powered to heat the working section at the corresponding position. Further, each working section 12 is provided with a temperature sensor, and the temperature sensor is connected to the electromagnetic coil through a control unit to control the heating temperature.

[0024] Currently, the single screw extruder usually uses an electric heating ring to generate heat and transmits heat to the barrel of the single screw extruder through contact conduction. At this time, only the heat close to the inner side of the barrel surface is transmitted to the barrel, and most of the heat outside is lost to the air, thereby resulting in low heating efficiency. In the embodiment, the electromagnetic coil is used for heating, and the molecules inside the working section are directly heated by magnetic energy, thereby reducing the heat loss to the air outside the working section and improving the uniformity and efficiency of heating.

[0025] In the embodiment, a plurality of cooling fans 16 are arranged below the barrel 13 of the single screw extruder 1, the plurality of cooling fans 16 correspond to the positions of the plurality of protective covers 14, and the cooling fan 16 is used to send air to the inside of the protective cover 14 to blow and cool the screw in the working section.

[0026] In the embodiment, the inside of the protective cover 14 is provided with an annular air supply pipe 17, the annular air supply pipe 17 surrounds the outside of the working section 12 and is located outside the electromagnetic coil, the lower end of the annular air supply pipe 17 is connected to the air outlet end of the cooling fan 16, a plurality of air outlets 18 are uniformly distributed on the inner circumferential side wall of the annular air supply pipe 17, and the air outlets 18 blow air to the barrel 13 along the radial direction of the annular air supply pipe. In the working process, the cooling fan sends air into the annular air supply pipe, and the airflow in the annular air supply pipe blows to the barrel through the air outlets. The air supply pipe surrounding the outside of the working section is used for air supply and cooling, so that the entire outer periphery of the working section can be effectively blown, the uniformity of cooling is improved, and local rapid cooling and local slow cooling of the working section are avoided.

[0027] It should be noted that the single screw extruder is a mature product, and the specific structure and extrusion principle of the single screw extruder will not be repeated here.

[0028] In the embodiment, the hopper 2 of the single screw extruder 1 is provided with a stirring assembly, the upper end side wall of the hopper 2 is provided with a feeding pipe 3 for feeding the preliminarily mixed PE particles, the stirring assembly 4 comprises a vertically arranged stirring shaft 5, the stirring shaft 5 is driven to rotate by a stirring motor 6 mounted on the top of the hopper 2, and the outer surface of the stirring shaft 5 is fixed with a spiral stirring blade 7.

[0029] If the utility model discloses or involves mutually fixed connecting parts or structural members, then, except for another declaration, fixed connection can be understood as: detachable fixed connection (for example, using bolt or screw connection), and also can be understood as: non-detachable fixed connection (for example, riveting, welding), of course, mutual fixed connection can also be replaced by integral structure (for example, using casting process integral forming to manufacture) (obviously, integral forming process is excluded).

[0030] In addition, the meaning of the term for indicating position relationship or shape applied in any technical scheme disclosed in the utility model comprises approximate, similar or close state or shape, except for another declaration.

[0031] Any component provided by the utility model can be assembled by multiple individual components, or can be an individual component manufactured by integral forming process.

[0032] Finally, it should be explained that: the above embodiment is only used to illustrate the technical scheme of the utility model and is not limited to it; although the utility model has been described in detail with reference to the preferred embodiment, those skilled in the art should understand that: the specific implementation of the utility model can still be modified or some technical features can be replaced by equivalent; without departing from the spirit of the technical scheme of the utility model, it should be covered in the technical scheme range of the utility model claimed in the utility model.

Claims

1. A flue gas discharging structure for PE film production, comprising a plurality of single-screw extruders arranged in parallel and spaced apart along a longitudinal direction, the extrusion ends of the single-screw extruders being connected to a distributor through pipelines, characterized in that: A flue gas discharging box is arranged directly above the distributor, a plurality of flue gas discharging pipes are connected between the bottom of the flue gas discharging box and the top of the distributor, flue gas on the distributor is discharged into the flue gas discharging box through the flue gas discharging pipes, one end of the flue gas discharging box is connected to the air inlet end of a flue gas discharging fan through an output pipe, and the flue gas discharging fan discharges the flue gas in the flue gas discharging box.

2. A fume exhaust structure for PE film production according to claim 1, characterized in that: The flue gas discharging box is provided with a flue gas filter near one end of the output pipe.

3. The flue gas exhaust structure for PE film production according to claim 2, characterized in that: The flue gas filter comprises a plurality of filter screens arranged at intervals along the flue gas flow direction, and the mesh hole diameters of the plurality of filter screens gradually decrease along the flue gas flow direction.

4. The flue gas exhaust structure for PE film production according to claim 2, characterized in that: The side of the flue gas filter facing the output pipe is provided with an activated carbon plate layer.

5. The flue gas exhaust structure for PE film production according to claim 1, characterized in that: The single-screw extruder has a plurality of working sections along its axial direction, a plurality of protective covers are arranged on the outer side of the barrel of the single-screw extruder at intervals along the axial direction, the positions of the plurality of protective covers correspond to the positions of the plurality of working sections, and an electromagnetic coil is arranged inside each protective cover and wound around the outer side of the working section.

6. The flue gas exhaust structure for PE film production according to claim 5, characterized in that: A plurality of cooling fans are arranged below the barrel of the single-screw extruder, the positions of the plurality of cooling fans correspond to the positions of the plurality of protective covers, and the cooling fans are used to blow air into the interior of the protective cover for air blowing and cooling.

7. The flue gas exhaust structure for PE film production according to claim 6, characterized in that: The interior of the protective cover is provided with an annular air supply pipe, the annular air supply pipe is annularly arranged on the outer side of the working section, the lower end of the annular air supply pipe is in communication with the air outlet end of the cooling fan, a plurality of air outlets are uniformly distributed on the inner circumferential side wall of the annular air supply pipe, and the air outlets blow air radially along the annular air supply pipe towards the barrel.

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