An integrated polypropylene particle devoc tower

Abstract

The present application relates to a kind of integrated polypropylene particle VOC tower, top and bottom are provided with feed inlet and discharge outlet respectively, middle section of tower includes intercommunicating heating drying section shell and cooling section shell, distribution pipe is arranged in heating drying section shell and cooling section shell, air inlet box and air outlet box are respectively arranged in the both sides of heating drying section shell, air inlet box is communicated with heat exchanger and distribution pipe in heating drying section shell respectively, heat exchanger is communicated with air blower, air outlet box is communicated with distribution pipe in heating drying section shell and dust collector respectively, air inlet box and air outlet box are respectively arranged in the both sides of cooling section shell, air inlet box is communicated with heat exchanger and distribution pipe in cooling section shell respectively, heat exchanger is communicated with air blower, air outlet box is communicated with distribution pipe in cooling section shell and dust collector respectively.The present application integrates and makes the heating drying section of drying tower, cooling section, heat exchanger as a whole equipment, so that the heat exchange effect of drying tower is better, cooling temperature is lower, so as to prevent polypropylene particle aging.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of drying tower, in particular to an integrated polypropylene particle VOC removal tower. BACKGROUND

[0002] Polypropylene is widely used in automotive interior parts such as instrument panels, control panels, door panels, seat components, glove boxes and air conditioning systems due to its excellent mechanical properties and processing properties, accounting for about 40% of automotive plastics. At present, polypropylene is mainly produced by liquid bulk polymerization in China, and the VOC content of the product exceeds 200 ppm. Polypropylene products release VOCs at different levels at high temperatures, which are harmful to human health.

[0003] GB / T27630 "Evaluation Guide for Air Quality in Passenger Cars" has been revised from a recommended guide to a mandatory national standard, and the VOC content of polypropylene is specified to be less than 80 ppm by the vehicle industry.

[0004] In order to meet market demand and environmental protection requirements, polypropylene production enterprises must further reduce the VOC content in polypropylene. At present, Tianhua Chemical Machinery and Automation Research Institute has designed a gas heating type VOC removal drying tower (application publication number CN109751859A) and a cooling tower for cooling the material after removing VOCs from polypropylene (application publication number CN109764699A). However, the above two devices are independent devices, which need to be used in series, resulting in a device height of forty meters. In addition, the above two devices have multiple inlets and outlets, each inlet is equipped with a heater, and each outlet is equipped with a filter, resulting in complex system piping, large number of heat exchangers, filters and fans, and high equipment and civil engineering costs. In order to solve the above problems, the present application designs an integrated polypropylene particle VOC removal tower. SUMMARY

[0005] Based on the above, the purpose of the present application is to provide an integrated polypropylene particle VOC removal tower, which can integrate the drying tower, heat exchanger and filter, reduce the number of exhaust pipes, heat exchangers and fans, and thus reduce the investment cost.

[0006] Therefore, the present application provides an integrated polypropylene particle VOC removal tower, which is provided with a feed inlet and a discharge outlet at the top and the bottom of the tower, respectively, and a heating and drying segment shell and a cooling segment shell which are in communication with each other in the middle segment of the tower, and distribution pipes are arranged in the heating and drying segment shell and the cooling segment shell,

[0007] First air inlet boxes and first air outlet boxes are arranged on both sides of the heating and drying segment shell, respectively, the first air inlet boxes are in communication with the first heat exchangers and the distribution pipes in the heating and drying segment shell, respectively, the first heat exchangers are in communication with the air blowers, and the first air outlet boxes are in communication with the distribution pipes in the heating and drying segment shell,

[0008] The second air inlet box is in communication with the second heat exchanger and the distribution pipe in the cooling section shell respectively.

[0009] In operation, the air blower sends air into the heat exchanger, the air is heated into hot air in the heat exchanger of the heating and drying section, the hot air enters the distribution pipe through the first air inlet box, becomes waste gas after heat exchange with the material and is collected to the first air outlet box, when the first air outlet box is connected with a dust collector, the first air outlet box sends the waste gas into the dust collector, and after dust removal, the waste gas can be recycled into the heat exchanger through the air blower; the air is cooled into cold air in the heat exchanger of the cooling section, the cold air enters the distribution pipe through the second air inlet box, becomes waste gas after heat exchange with the material and is collected to the second air outlet box, when the second air outlet box is connected with a dust collector, the second air outlet box sends the waste gas into the dust collector, and after dust removal, the waste gas can be recycled into the heat exchanger through the air blower; at the same time, the polypropylene particles enter the integrated polypropylene particle VOC removal tower through the feeding port, are heated and dried and cooled in the distribution pipe in the heating and drying section shell and the cooling section shell respectively in sequence, and are then discharged through the discharge port.

[0010] In the integrated polypropylene particle VOC removal tower, the heating and drying section shell and the cooling section shell are in communication through a material collector.

[0011] In the integrated polypropylene particle VOC removal tower, the heating and drying section shell and the cooling section shell are connected through a flange.

[0012] In the integrated polypropylene particle VOC removal tower, the first air outlet box and the second air outlet box are in communication with a dust collector respectively, and the dust collector is in communication with the air blower.

[0013] In the integrated polypropylene particle VOC removal tower, a material distributor is arranged below the feeding port in the VOC removal tower.

[0014] In the integrated polypropylene particle VOC removal tower, a flow regulator is arranged above the discharge port in the VOC removal tower.

[0015] In the integrated polypropylene particle VOC removal tower, the distribution pipe comprises air inlet distribution pipes and air outlet distribution pipes which are alternately and uniformly distributed in the heating and drying section shell and / or the cooling section shell.

[0016] The integrated polypropylene particle VOC removal tower, wherein preferably, the first heat exchanger and the second heat exchanger are finned tube heat exchangers respectively.

[0017] The integrated polypropylene particle VOC removal tower, wherein preferably, air inlets are arranged in the first air inlet box and the second air inlet box respectively, and the air inlets are communicated with the distribution pipes.

[0018] The integrated polypropylene particle VOC removal tower, wherein preferably, air outlets are arranged in the first air outlet box and the second air outlet box respectively, and the air outlets are communicated with the dust collectors.

[0019] The beneficial effects of the present application are as follows:

[0020] (1) The integrated polypropylene particle VOC removal tower is integrated by a heating and drying section and a cooling section. In the heating and drying section, air is heated by the heat exchanger, and the hot air is uniformly introduced into the distribution pipe through the air inlet box, so that the production material is fully contacted with the hot air in the distribution pipe to strengthen the heat exchange effect and reduce the energy consumption caused by single unit heating. In the cooling section, air is cooled by the heat exchanger, and the cooled air is uniformly introduced into the distribution pipe through the air inlet box to deeply cool the heated and dried polypropylene, so as to ensure that the temperature of the polypropylene is lower and aging is prevented, and the production requirements of the user are met.

[0021] (2) The heating and drying section and the cooling section of the drying tower are connected with the dust collector on the right side of the air outlet box. The outlet of the air outlet box is connected with the dust collector, and the air after the treatment of the dust collector can meet the national emission standard. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 The figure is a structural schematic diagram of the integrated polypropylene particle VOC removal tower of the present application.

[0023] Wherein: 1-fin tube heat exchanger, 2-air inlet box, 3-material collector, 4-feeding port, 5-feeding distributor, 6-heating and drying section shell, 7-dust collector, 8-air outlet box, 9-pipe flange, 10-cooling section shell, 11-flow straightener, 12-discharging port. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application, and do not limit the present application. The element symbols and / or letters of the present application may be repeatedly used in each example. The purpose of the repetition is to simplify and clarify, and it does not itself define the relationship between the discussed examples and / or configurations.

[0025] In the description of the present application, it should be understood that the terms "upper", "lower", "left" and "right" indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of conveniently describing the structure and operation, and do not indicate or imply that the parts referred to must have a particular orientation, operate in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0026] The integrated polypropylene particle VOC removal tower provided by the present application is provided with a feed inlet and a discharge outlet at the top and the bottom respectively, and a heating and drying section shell and a cooling section shell which are in communication with each other are arranged in the middle section of the tower, and distribution pipes are arranged in the heating and drying section shell and the cooling section shell,

[0027] First air inlet boxes and first air outlet boxes are arranged on the two sides of the heating and drying section shell respectively, the first air inlet boxes are in communication with the first heat exchangers and the distribution pipes in the heating and drying section shell respectively, the first heat exchangers are in communication with the air blower, and the first air outlet boxes are in communication with the distribution pipes in the heating and drying section shell,

[0028] Second air inlet boxes and second air outlet boxes are arranged on the two sides of the cooling section shell respectively, the second air inlet boxes are in communication with the second heat exchangers and the distribution pipes in the cooling section shell respectively, the second heat exchangers are in communication with the air blower, and the second air outlet boxes are in communication with the distribution pipes in the cooling section shell.

[0029] In operation, the air blower sends air into the heat exchangers, the air in the heat exchangers of the heating and drying section is heated into hot air, the hot air enters the distribution pipes through the first air inlet boxes, becomes waste gas after heat exchange with the material and is collected to the first air outlet boxes, when the first air outlet boxes are connected with a dust collector, the first air outlet boxes send the waste gas into the dust collector, and the waste gas can be recycled by the air blower into the heat exchanger after dust removal; the air in the heat exchangers of the cooling section is cooled into cold air, the cold air enters the distribution pipes through the second air inlet boxes, becomes waste gas after heat exchange with the material and is collected to the second air outlet boxes, when the second air outlet boxes are connected with a dust collector, the second air outlet boxes send the waste gas into the dust collector, and the waste gas can be recycled by the air blower into the heat exchanger after dust removal; at the same time, the polypropylene particles enter the integrated polypropylene particle VOC removal tower from the feed inlet, are heated and dried and cooled in the distribution pipes in the heating and drying section shell and the cooling section shell respectively, and are then discharged from the discharge outlet.

[0030] In some embodiments, preferably, the heating and drying section shell and the cooling section shell are in communication through a material collector inside.

[0031] In some embodiments, preferably, the heating and drying section shell and the cooling section shell are connected through flanges outside.

[0032] In some embodiments, preferably, the first air outlet box and the second air outlet box are further in communication with a dust collector, and the dust collector is in communication with a blower.

[0033] In some embodiments, preferably, the VOC removal tower is provided with a distributor below the feed inlet.

[0034] In some embodiments, preferably, the VOC removal tower is provided with a flow regulator above the discharge outlet.

[0035] In some embodiments, preferably, the distribution pipe comprises air inlet distribution pipes and air outlet distribution pipes alternately and uniformly distributed vertically in the heating and drying section shell and / or the cooling section shell.

[0036] In some embodiments, preferably, the first heat exchanger and the second heat exchanger are independently finned tube heat exchangers.

[0037] In some embodiments, preferably, the first air inlet box and the second air inlet box are each provided with an air inlet, and the air inlet is in communication with the distribution pipe.

[0038] In some embodiments, preferably, the first air outlet box and the second air outlet box are each provided with an air outlet, and the air outlet is in communication with the dust collector.

[0039] Embodiment 1

[0040] Referring to Figure 1 As shown, the integrated polypropylene particle VOC removal tower provided by the embodiment is provided with a feed inlet 4 and a discharge outlet 12 at the top and the bottom of the tower, respectively. The VOC removal tower is provided with a distributor 5 below the feed inlet 4 and a flow regulator 11 above the discharge outlet 12.

[0041] The middle section of the tower comprises a heating and drying section shell 6 and a cooling section shell 10 in communication with each other. The heating and drying section shell 6 and the cooling section shell 10 are each provided with distribution pipes alternately and uniformly distributed vertically, and the distribution pipes comprise air inlet distribution pipes and air outlet distribution pipes. The inside of the heating and drying section shell 6 and the cooling section shell 10 is in communication through a material collector 3, and the outside is connected through a pipe flange 9.

[0042] The heating and drying section shell 6 is provided with an air inlet box 2 and an air outlet box 8 on the left and right sides, respectively. The left and right sides of the air inlet box 2 are in communication with a finned tube heat exchanger 1 and the distribution pipes in the heating and drying section shell 6, respectively. The finned tube heat exchanger 1 is in communication with a blower (not shown). The left and right sides of the air outlet box 8 are in communication with the distribution pipes in the heating and drying section shell 6 and a dust collector 7, respectively.

[0043] The left and right sides of the cooling section shell 10 are respectively provided with an air inlet box 2 and an air outlet box 8, the left and right sides of the air inlet box 2 are respectively communicated with the finned tube heat exchanger 1 and the distribution pipe in the cooling section shell 10, the finned tube heat exchanger 1 is communicated with a blower, and the left and right sides of the air outlet box 8 are respectively communicated with the distribution pipe in the cooling section shell 10 and the dust collector 7.

[0044] For the integrated polypropylene particle VOC removal tower provided by the application, specifically, the finned tube heat exchanger 1 and the dust collector 7 are both 2, one in the heating and drying section and one in the cooling section, the air inlet box 2 and the air outlet box 8 are integrated and used, both are 2, one in the heating and drying section and one in the cooling section, the air inlet box 2 and the air outlet box 8 are symmetrically arranged on the outer sides of the drying and heating section shell 8 and the cooling section shell 10, and the corresponding air inlet box 2 and air outlet box 8 are arranged on the same section of the outer side of the shell 6 and the shell 10, air is sent into the finned tube heat exchanger 1 by the blower, in the heating and drying section, the hot air treated by heating is evenly sent into the distribution pipe, and after heat exchange with the material, the air is directly discharged from the distribution pipe and sent into the air outlet box 8, and then treated by the dust collector 7, so that the dust content of the tail gas is effectively reduced, which is beneficial to the discharge of the tail gas; in the cooling section, the cold air treated by refrigeration is evenly sent into the distribution pipe, and after cooling the material, the air is directly discharged from the distribution pipe and sent into the air outlet box 8, and then treated by the dust collector 7.

[0045] Compared with the existing device, the integrated polypropylene particle VOC removal tower provided by the application can integrate the drying tower, the heat exchanger and the filter, reduce the number of exhaust pipes, the number of heat exchangers and the number of fans, thereby reducing the investment cost.

[0046] The working process of the embodiment is as follows: the material to be dried enters from the material inlet 4 on the upper side of the heating and drying section shell 6, is evenly distributed into the drying chamber by the distributor 5, flows between the shell 6 and the pipe wall of the distribution pipe, the air heated by the finned tube heat exchanger 1 enters the distribution pipe, the material is dried and heat exchanged, and then the heat-exchanged gas is discharged from the distribution pipe into the air outlet box 8, the tail gas collected in the air outlet box 8 is purified in the dust collector 7, the material stays in the heating and drying section shell 6 for a period of time, is dried, and then is discharged from the material collector 3 on the lower side of the shell 6 into the tower cooling section, the material in the cooling section flows between the cooling section shell 10 and the pipe wall of the distribution pipe, the air cooled by the finned tube heat exchanger 1 enters the distribution pipe, the material is deeply cooled, and then the heat-exchanged gas is discharged from the distribution pipe into the air outlet box 8, the tail gas collected in the air outlet box 8 is purified in the dust collector 7, and the deeply cooled material is cooled in the shell 10, and then flows out of the discharge port 12 on the lower side of the cooling section shell 10 by the rectifier 11.

[0047] In summary, the integrated polypropylene particle VOC removal tower is integrated by a heating drying section and a cooling section. In the heating drying section, the air is heated by the heat exchanger, and the hot air is evenly introduced into the air distribution pipe through the air inlet box, so that the production material is in full contact with the hot air in the distribution pipe to strengthen the heat exchange effect and reduce the energy consumption caused by single unit heating. In the cooling section, the air is cooled by the heat exchanger, and the cold air is evenly introduced into the air distribution pipe through the air inlet box, so that the heated and dried polypropylene is deeply cooled to ensure that the temperature of the polypropylene is lower and aging is prevented, and the production requirements of the user are met.

[0048] In addition, the heating drying section and the cooling section of the drying tower are connected with dust collectors on the right side of the air outlet box. The outlet of the air outlet box is connected with the dust collector. After the treatment of the dust collector, it is ensured that the exhaust air meets the national emission standard.

[0049] It should be noted that the above preferred embodiments are only used to illustrate the present application, but the present application is not limited to the embodiments. Changes and modifications made by those skilled in the art within the concept of the present application are within the protection scope of the present application.

Claims

1. An integrated polypropylene particle de-VOC tower characterized by, The top and bottom of the tower are respectively provided with a feed inlet and a discharge outlet, the middle section of the tower comprises a heating and drying section shell and a cooling section shell which are in communication with each other, and distribution pipes are arranged in the heating and drying section shell and the cooling section shell, the distribution pipes comprise air inlet distribution pipes and air outlet distribution pipes which are alternately and uniformly distributed in the heating and drying section shell and / or the cooling section shell, first air outlet boxes are arranged on the two sides of the heating and drying section shell, a first heat exchanger is arranged on the first air inlet box, the first air inlet box is in communication with the first heat exchanger and the distribution pipes in the heating and drying section shell respectively, and no pipeline is arranged between the first air inlet box and the first heat exchanger and between the first air inlet box and the distribution pipes in the heating and drying section shell, the first heat exchanger is in communication with a blower, the first air outlet box is in communication with the distribution pipes in the heating and drying section shell, a dust collector is arranged on the first air outlet box, an air outlet is arranged in the first air outlet box and in communication with the dust collector through the air outlet, second air inlet boxes and second air outlet boxes are arranged on the two sides of the cooling section shell, a second heat exchanger is arranged on the second air inlet box, the second air inlet box is in communication with the second heat exchanger and the distribution pipes in the cooling section shell respectively, the second heat exchanger is in communication with the blower, and no pipeline is arranged between the second air inlet box and the second heat exchanger and between the second air inlet box and the distribution pipes in the cooling section shell, the second air outlet box is in communication with the distribution pipes in the cooling section shell, a dust collector is arranged on the second air outlet box, an air outlet is arranged in the second air outlet box and in communication with the dust collector through the air outlet, air inlets are arranged in the first air inlet box and the second air inlet box and in communication with the distribution pipes through the air inlets; in work, the blower sends air into the heat exchanger, the air is heated into hot air in the heat exchanger of the heating and drying section, the hot air enters the distribution pipes through the first air inlet box, becomes waste gas after heat exchange with the material and is collected to the first air outlet box, when the first air outlet box is connected with the dust collector, the first air outlet box sends the waste gas into the dust collector, the air is cooled into cold air in the heat exchanger of the cooling section, the cold air enters the distribution pipes through the second air inlet box, becomes waste gas after heat exchange with the material and is collected to the second air outlet box, when the second air outlet box is connected with the dust collector, the second air outlet box sends the waste gas into the dust collector, at the same time, the polypropylene particles enter the integrated polypropylene particle VOC removal tower through the feed inlet, are heated and dried and cooled in the distribution pipes in the heating and drying section shell and the cooling section shell respectively and then are discharged through the discharge outlet.

2. The integrated polypropylene particle de-VOC tower of claim 1, wherein, The heating and drying section shell and the cooling section shell are in communication through a material collector.

3. The integrated polypropylene particle de-VOC tower of claim 1, wherein, The heating and drying section shell and the cooling section shell are connected through flanges.

4. The integrated polypropylene particle de-VOC tower of claim 1, wherein, The dust collector connected with the first air outlet box is also in communication with the blower, the waste gas is dusted through the dust collector and then is circulated into the heat exchanger through the blower.

5. The integrated polypropylene particle de-VOC tower of claim 1, wherein, The dust collector connected with the second air outlet box is also in communication with the blower, the waste gas is dusted through the dust collector and then is circulated into the heat exchanger through the blower.

6. The integrated polypropylene particle de-VOC tower of claim 1, wherein, A material distributor is arranged below the feed inlet in the VOC removal tower.

7. The integrated polypropylene particle de-VOC tower of claim 1, wherein, The de-VOC tower is provided with a flow regulator above the discharge port.

8. The integrated polypropylene particle de-VOC tower of claim 1, wherein, The first heat exchanger and the second heat exchanger are respectively and independently finned tube heat exchangers.

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