Polyethylene product processing equipment and drying device

Abstract

The utility model discloses polyethylene product processing equipment and a drying device, and the drying device comprises at least two stages of drying boxes; the drying hot roller set comprises a first drying hot roller set arranged at the front end of the first-stage drying box and a second drying hot roller set arranged at the rear end of the first-stage drying box; the traction roller sets are arranged between every two adjacent stages of drying boxes; the heating device is mounted in the drying box; an object to be dried bypasses the first drying hot roller set, then enters the first-stage drying box, is led out of the first-stage drying box through the second drying hot roller set, then enters the next-stage drying box through the traction roller set, passes through the last-stage drying box and then is led out through a guide roller. By means of the multi-stage drying boxes arranged in a hierarchical mode, multi-stage drying is achieved, and the drying efficiency and the drying effect of tows or films to be dried are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical fiber production equipment, in particular to polyethylene product processing equipment and a drying device. Background Art

[0002] With the growing development of the chemical industry, the processing method using dichloromethane as an extractant has gradually entered the mature stage of industrialization from the experimental stage. Compared with traditional extractants such as hydrocarbons and xylene used in the production of UHMWPE (ultra-high molecular weight polyethylene) fibers, the dichloromethane method offers significant advantages in terms of safety and cost. However, due to the volatility and easy freezing of dichloromethane, traditional post-spinning equipment using hydrocarbons and xylene as extractants is not suitable for the production of dichloromethane methods. Currently, drying equipment specifically developed for dichloromethane uses water bath heating to evaporate the dichloromethane, followed by hot air drying to remove moisture from the surface of the filaments. However, the drying cycle of water bath evaporation and hot air drying is long and the drying effect is poor.

[0003] In view of this, providing a drying device for polyethylene product processing equipment in order to improve the drying efficiency and drying effect of the filaments has become an urgent problem to be solved by those skilled in the art. Utility Model Content

[0004] To this end, an embodiment of the present invention provides a polyethylene product processing equipment and a drying device to solve at least one technical problem existing in the above-mentioned prior art.

[0005] In order to achieve the above objectives, the present invention provides the following technical solutions:

[0006] The utility model provides a drying device for polyethylene product processing equipment, the drying device comprising:

[0007] A drying box, the drying box comprising at least two stages, the drying box being provided with an air outlet and an air return port, the air outlet and the air return port being connected via an air pipeline;

[0008] A drying hot roller group, comprising a first drying hot roller group disposed at the front end of the first-stage drying box and a second drying hot roller group disposed at the rear end of the first-stage drying box;

[0009] A traction roller group is provided between two adjacent drying boxes;

[0010] A heating device installed in the drying box;

[0011] The object to be dried passes around the first drying hot roller group and enters the first-stage drying box, and is led out of the first-stage drying box through the second drying hot roller group, and then enters the next-stage drying box through the traction roller group. The object to be dried passes through the final-stage drying box and is led out through the guide roller.

[0012] During the drying process, the material to be dried after dichloromethane extraction is sent to the drying device. According to the forward direction of the fiber, the first-stage drying box is mainly used to remove dichloromethane on the surface and inside of the filaments, and the subsequent drying box (including the second to the final drying box) is used to remove water on the surface of the fiber. The multi-stage drying boxes arranged in layers can achieve multi-stage drying, thereby improving the drying efficiency and drying effect of the filament bundles or membranes to be dried. At the same time, the traction roller group arranged between the drying boxes at each level can effectively realize the traction and guidance of the filament bundles or membranes to be dried, thereby ensuring the smooth traction of the filament bundles or membranes to be dried in different drying boxes.

[0013] In some embodiments, a fan is provided on the gas pipeline.

[0014] In some embodiments, a condensation recovery heat exchanger is provided on the gas pipeline, and the condensation recovery heat exchanger is located on a side of the fan away from the air outlet.

[0015] In some embodiments, a return air heating heat exchanger is provided on the gas pipeline, and the return air heating heat exchanger is located on a side of the condensation recovery heat exchanger away from the gas outlet.

[0016] In some embodiments, the drying device further comprises:

[0017] A condensation recovery device is connected to the gas pipeline of the first-stage drying box.

[0018] In some embodiments, the drying device further comprises:

[0019] A dehydration device is provided, wherein the air pipeline of the drying box at the last stage is connected to the dehydration device.

[0020] In some embodiments, the heating device includes at least one of a fin heater, a coil heater, and a ceramic infrared heater.

[0021] The utility model also provides polyethylene product processing equipment, comprising the drying device as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are merely illustrative, and those skilled in the art can, without inventive effort, derive other implementation drawings based on the provided drawings.

[0023] The structures, proportions, sizes, etc. illustrated in this specification are intended solely to complement the contents disclosed herein and to facilitate understanding and reading by persons familiar with the art. They are not intended to limit the conditions under which the present invention may be implemented and therefore have no substantive technical significance. Any structural modifications, changes in proportions, or adjustments in size, without affecting the efficacy and objectives of the present invention, shall remain within the scope of the technical contents disclosed herein.

[0024] Figure 1 This is a schematic structural diagram of the drying device provided by the utility model.

[0025] Description of reference numerals:

[0026] 1- Drying hot roller group, 2- Pulling roller group, 3- Guide roller, 4- Air outlet, 5- Return air outlet, 6- Fan; 7- Condensation recovery heat exchanger, 8- Return air heating heat exchanger, 9- Gas flow meter, 10- Heating device. DETAILED DESCRIPTION

[0027] The following describes the implementation of the present invention through specific embodiments. Those skilled in the art can readily understand the other advantages and benefits of the present invention from the contents disclosed in this specification. Obviously, the embodiments described are only a portion of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention.

[0028] The following combination Figure 1 The drying device provided by the utility model is introduced.

[0029] In a specific embodiment, the drying device provided by the present invention is used for polyethylene product processing equipment. It should be noted that the equipment can be polyethylene fiber processing equipment or polyethylene film processing equipment. The product mentioned herein refers to polyethylene fiber or polyethylene film, and the object to be dried refers to fiber bundle or film. Figure 1As shown, the drying device includes a drying box, a drying hot roller group 1, a traction roller group 2, a guide roller 3 and a heating device 10; wherein, the drying box includes at least two stages, and an air outlet 4 and an air return port 5 are provided on the drying box, and the air outlet 4 and the air return port 5 are connected by an air pipeline; it should be understood that the drying box is a multi-stage structure. This embodiment takes a three-stage drying box as an example. The first-stage drying box is used as a front-stage drying box mainly to remove dichloromethane on the surface and inside of the silk strips, and the remaining multi-stage drying boxes are used as post-stage drying to remove water on the fiber surface, and the main drying medium is air.

[0030] The pulling roller group 2, guide roller 3 and drying hot roller group 1 respectively located at the two ends of each drying box body constitute a transmission device, each drying hot roller group 1 includes two rollers, and each pulling roller group 2 includes two rollers. The filament bundle or film to be dried passes around each roller in turn; and the drying hot roller group 1 includes a first drying hot roller group 1 arranged at the front end of the first-level drying box, and a second drying hot roller group 1 arranged at the rear end of the first-level drying box, and the pulling roller group 2 is arranged between the two adjacent levels of the drying boxes; that is, the drying hot roller group 1 is provided at both ends of the drying box located at the first level, and the pulling roller group 2 is provided at both ends of the drying boxes of the remaining levels.

[0031] The heating device 10 is installed in the drying box. The heating device 10 includes various possible heating structures such as fin heaters, coil heaters, ceramic infrared heaters, tubes, jacketed heat exchangers, etc. This embodiment takes the heating coil as an example, and the heating device 10 is located above and / or below the drying object.

[0032] The object to be dried passes around the first drying hot roller group 1 and enters the first-stage drying box. It is led out of the first-stage drying box through the second drying hot roller group 1 and enters the next-stage drying box through the traction roller group 2. The object to be dried passes through the final-stage drying box and is led out through the guide roller 3. When passing through the drying box, it is dried by the heating device 10 and the horizontal air flow.

[0033] During the drying process, the material to be dried after dichloromethane extraction is sent to the drying device. According to the forward direction of the fiber, the first-stage drying box is mainly used to remove dichloromethane on the surface and inside of the filaments, and the subsequent drying box (including the second to the final drying box) is used to remove water on the surface of the fiber. The multi-stage drying boxes arranged in layers can achieve multi-stage drying, thereby improving the drying efficiency and drying effect of the filament bundles or membranes to be dried. At the same time, the traction roller group 2 arranged between the drying boxes at each level can effectively realize the traction and guidance of the filament bundles or membranes to be dried, thereby ensuring the smooth traction of the filament bundles or membranes to be dried in different drying boxes.

[0034] In actual operation, the pre-drying method mainly uses hot rollers and thermal radiation drying, and the air flow within the drying box is laminar. Dichloromethane evaporates on the hot rollers to prevent frost and ice from forming on the roller surface. To transport the evaporated dichloromethane to the gas recovery unit, the pre-drying box is equipped with an air outlet 4 and an air return 5. The post-drying box removes moisture from the fiber surface with hot air. The drying box is equipped with exhaust and return vents, and the air flow within the drying box is turbulent.

[0035] Furthermore, a fan 6 is provided on the gas pipeline so that the dichloromethane output from the gas outlet 4 can smoothly enter the condensation recovery heat exchanger 7.

[0036] In some embodiments, a condensation recovery heat exchanger 7 is provided on the gas pipeline and is located on a side of the fan 6 away from the gas outlet 4. The separated dichloromethane is cooled by the condensation recovery heat exchanger 7 before entering the condensation recovery device, thereby achieving separation of dichloromethane gas and water vapor, and ensuring that the dichloromethane can completely enter the condensation recovery device.

[0037] In order to ensure that the gas returning to the drying box has a sufficiently high temperature, thereby preventing cold air from entering and affecting the drying efficiency of the drying box, a return air heating heat exchanger 8 is provided on the gas pipeline. The return air heating heat exchanger 8 is located on the side of the condensation recovery heat exchanger 7 away from the air outlet 4, so that the low-temperature gas coming out of the condensation recovery heat exchanger 7 enters the drying box after being heated.

[0038] In some embodiments, the drying apparatus further comprises a condensate recovery unit and a water removal unit. The gas line of the first-stage drying oven is connected to the condensate recovery unit, and the gas line of the final-stage drying oven is connected to the water removal unit. The off-gas from the dichloromethane drying is fed into the condensate recovery unit, and the off-gas from the water removal drying is fed into the water removal unit.

[0039] Furthermore, each connecting pipeline is provided with a gas flow meter 9. In addition to the above drying device, the present invention also provides a polyethylene product processing equipment including the drying device. For other parts of the polyethylene product processing equipment, please refer to the prior art and will not be described in detail here.

[0040] The above specific implementation methods further describe in detail the purpose, technical solutions and beneficial effects of the utility model. It should be understood that the above are only specific implementation methods of the utility model and are not used to limit the scope of protection of the utility model. Any modifications, equivalent replacements, improvements, etc. made on the basis of the technical solution of the utility model should be included in the scope of protection of the utility model.

Claims

1. A drying device for polyethylene product processing equipment, characterized in that: The drying device comprises: A drying box, the drying box comprising at least two stages, the drying box being provided with an air outlet and an air return port, the air outlet and the air return port being connected via an air pipeline; A drying hot roller group, comprising a first drying hot roller group disposed at the front end of the first-stage drying box and a second drying hot roller group disposed at the rear end of the first-stage drying box; A traction roller group is provided between two adjacent drying boxes; A heating device installed in the drying box; The object to be dried passes around the first drying hot roller group and enters the first-stage drying box, and is led out of the first-stage drying box through the second drying hot roller group, and then enters the next-stage drying box through the traction roller group. The object to be dried passes through the final-stage drying box and is led out through the guide roller.

2. The drying device according to claim 1, characterized in that A fan is provided on the gas pipeline.

3. The drying device according to claim 2, characterized in that A condensation recovery heat exchanger is provided on the gas pipeline, and the condensation recovery heat exchanger is located on a side of the fan away from the air outlet.

4. The drying device according to claim 3, characterized in that A return air heating heat exchanger is provided on the gas pipeline, and the return air heating heat exchanger is located on a side of the condensation recovery heat exchanger away from the gas outlet.

5. The drying device according to any one of claims 1 to 4, characterized in that: Also includes: A condensation recovery device is connected to the gas pipeline of the first-stage drying box.

6. The drying device according to any one of claims 1 to 4, characterized in that: Also includes: A dewatering device is provided, wherein the air pipeline of the drying box at the last stage is connected to the dewatering device.

7. The drying device according to any one of claims 1 to 4, characterized in that: The heating device includes at least one of a fin heater, a coil heater, a ceramic infrared heater, a tube and tube, and a jacket heat exchanger.

8. A polyethylene product processing equipment, characterized in that: The drying device comprises the drying device according to any one of claims 1 to 7.

Images