Air pipe structure for decomposing ozone

Abstract

The utility model discloses an air pipe structure for decomposing ozone, and relates to the technical field of gas discharge pipelines. Comprising a plurality of pipe sections connected end to end, each pipe section comprises an inner pipe, an outer pipe and an interlayer space formed by the inner pipe and the outer pipe which are concentrically arranged, high-temperature waste gas enters from the inner pipe at one end and is discharged from the inner pipe at the other end, and the pipe section close to the high-temperature waste gas inlet end is connected with at least one ozone inlet pipeline. And the pipe section close to the low-temperature waste gas discharge end is connected with at least one decomposition gas outlet pipeline. Ozone is conveyed through an interlayer space generated by the two pipelines which are coaxially arranged, meanwhile, the inner pipe is used for conveying high-temperature waste gas, the high-temperature waste gas exchanges heat with the ozone, heat energy in the high-temperature waste gas is recycled, meanwhile, the decomposition efficiency of the ozone is greatly improved, and energy conservation and environment protection are facilitated; and the stroke of ozone in the pipeline is prolonged by adopting the continuous turbulent flow folds, so that the retention time and the heat exchange time of the ozone in the pipeline are prolonged, and the ozone can be decomposed more thoroughly.

Description

Technical Field

[0001] This utility model relates to the field of gas emission pipeline technology, specifically to a duct structure for decomposing ozone. Background Technology

[0002] To improve the surface properties of PET film, enhance adhesion, remove surface dust, and promote uniformity in printing and coating, corona treatment is typically applied. This corona treatment generates ozone because high-speed electrons collide with oxygen molecules during corona discharge, causing the oxygen molecules to ionize and form ozone. Ozone is usually discharged outdoors through fans. However, when ozone concentrations exceed certain levels, it can negatively impact human health and the surrounding environment, making ozone emissions a significant concern. Therefore, based on the characteristics of imported PET production lines (TDO setting zone operating temperature between 210℃ and 245℃) and our own process conditions, we have proposed an ozone decomposition device installed in the exhaust duct of the TDO system's setting zone. This device utilizes the highest-temperature exhaust gas from the TDO system to thermally decompose the ozone. The decomposed ozone is then mixed with the exhaust gas for optimal ozone decomposition. This leads to the proposed duct structure for ozone decomposition. Utility Model Content

[0003] The purpose of this invention is to provide a duct structure for decomposing ozone.

[0004] The technical problem solved by this utility model is: ozone emissions generated during the thin film production process affect the environment, and how to utilize the high-temperature waste gas during the production process to improve the ozone decomposition efficiency.

[0005] This utility model can be achieved through the following technical solution: a duct structure for decomposing ozone, comprising multiple pipe sections connected end to end, each pipe section including an inner pipe and an outer pipe arranged concentrically, the inner pipe and the outer pipe forming a uniform interlayer space, high-temperature exhaust gas entering from the inner pipe of the pipe section located at one end and exiting from the inner pipe of the pipe section located at the other end, the pipe section near the high-temperature exhaust gas entry end is connected to at least one ozone inlet pipe communicating with the interlayer space, and the pipe section near the low-temperature exhaust gas exit end is connected to at least one decomposition exhaust pipe.

[0006] A further technical improvement of this utility model is that three support rings are evenly arranged at equal angles at the mid-section of the inner and outer tubes, the three support rings abut against the two tube walls, and the three support rings are fixed to at least one of the tube walls of the inner and outer tubes.

[0007] A further technical improvement of this utility model is that the decomposed gas outlet pipe is tangentially connected to the interlayer space along the outer pipe.

[0008] A further technical improvement of this utility model is that continuous turbulence folds are provided on both sides of the interlayer space. The continuous turbulence folds are in the shape of waves, and the troughs and crests of the two continuous turbulence folds are staggered and correspond to each other.

[0009] A further technical improvement of this utility model is that: the outer tube includes two semi-circular arc parts, and the two semi-circular arc parts are hinged along one overlapping side, and the other side is connected by a quick-release locking structure, and a high-temperature resistant sealing ring is provided at the joint of the two semi-circular arc parts.

[0010] A further technical improvement of this utility model is that: the quick-release locking structure includes an upper locking block and a lower locking block fixed at corresponding positions on the two parts of the outer tube. A wing bolt is provided through the upper locking block and is threadedly connected to the lower locking block. A spring is sleeved on the outer periphery of the middle part of the wing bolt, and the two ends of the spring abut against the wing bolt and the upper locking block respectively.

[0011] A further technical improvement of this utility model is that a graphite layer is provided on the side of the three support rings away from the fixed end, and the graphite layer slides in cooperation with the corresponding pipe wall.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. This utility model uses the sandwich space created by two coaxially arranged pipes to transport ozone. At the same time, the inner pipe is used to transport high-temperature waste gas. The high-temperature waste gas exchanges heat with ozone, and the heat energy in the high-temperature waste gas is recovered and utilized, which greatly accelerates the decomposition efficiency of ozone, thus saving energy and protecting the environment.

[0014] 2. This utility model uses continuous turbulence pleats to extend the ozone's travel distance within the pipe, thereby increasing the ozone's residence and heat exchange time within the pipe, enabling more thorough decomposition of ozone. This method solves the problem of cost and site limitations in extending the pipe. At the same time, the outer pipe is divided into two parts, which allows for quick opening to clean the impurities accumulated in the pleats. The mutual rotation setting of the outer and inner pipes allows for quick cleaning of hard-to-clean areas after rotation. Attached Figure Description

[0015] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0016] Figure 1 This is a schematic diagram of the intake section pipe structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the air outlet pipe section structure of this utility model;

[0018] Figure 3 This is a side view of the intake section pipe structure of this utility model;

[0019] Figure 4 A graph showing the rate of ozone decomposition at different temperatures.

[0020] Figure 5 This is a schematic diagram of the continuous turbulence fold structure in the interlayer space in Embodiment 2 of this utility model;

[0021] Figure 6 This is a cross-sectional view of a vertical section of the pipe segment in Embodiment 2 of this utility model;

[0022] Figure 7 This utility model Figure 6 Enlarged detail of point A in the middle.

[0023] In the diagram: 1. Inner pipe; 2. Outer pipe; 3. Ozone inlet pipe; 4. Decomposition outlet pipe; 5. Support ring; 6. Continuous turbulence pleats; 7. Graphite layer; 8. Sealing ring; 9. Lower locking block; 10. Upper locking block; 11. Wing bolt; 12. Spring. Detailed Implementation

[0024] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0025] Example 1

[0026] Please see Figure 1-3 As shown, a duct structure for decomposing ozone is provided. The duct structure consists of multiple small pipe segments connected end to end. Each small pipe segment includes an inner pipe 1 and an outer pipe 2 arranged concentrically, thereby forming a sandwich space between the inner pipe 1 and the outer pipe 2. In order to maintain the relative position of the inner and outer pipes and the uniformity of the height of the sandwich space, three support rings 5 ​​are evenly arranged at the same angle at a certain cross-section position between the inner pipe 1 and the outer pipe 2. The support rings 5 ​​are fixed to both the inner pipe 1 and the outer pipe 2.

[0027] Located at the beginning and end of the duct structure are the gas inlet section and the gas outlet section, respectively. In the gas inlet section, high-temperature exhaust gas from TDO is introduced from the end of the inner pipe 1. At least one ozone inlet pipe 3 is tangentially connected to the interlayer space on the outer side of the outer pipe 2 in this section. The specific number of ozone inlet pipes 3 depends on the ozone generation source in the actual production process. The flow direction of the high-temperature hot gas and the ozone gas is the same. In the gas outlet section, at least one decomposition outlet pipe 4 is connected to the outer side of the outer pipe 2, and low-temperature exhaust gas from TDO is discharged from the end of the inner pipe 1.

[0028] Furthermore, the ozone inlet pipe 3 should be positioned as close as possible to the inlet end of the high-temperature hot gas in the inner pipe 1, so as to make full use of the entire stroke of the duct structure and the heat in the high-temperature hot gas for heat exchange to achieve a better ozone decomposition effect; similarly, the decomposition outlet pipe 4 should be positioned as close as possible to the outlet end of the inner pipe 1.

[0029] It should be noted that TDO is a component system of the biaxially oriented film production line in the plastic film industry. The film enters from the TDO inlet and is stretched and formed according to the required stretch ratio (generally between 3.2 and 3.6) through the internal tracks and chain clamps of the TDO.

[0030] This invention utilizes the property that ozone easily decomposes into oxygen, and the decomposition rate increases with increasing temperature. The ozone decomposition efficiency at different temperatures is shown below. Figure 4 As shown, the high-temperature exhaust gas from the longitudinal drying oven in the TDO is introduced into the inner pipe 1, while the ozone discharged from the corona machine is sent into the interlayer space through the ozone inlet pipe 3. The high-temperature exhaust gas and the ozone in the interlayer space undergo heat exchange to increase the ozone temperature and thus improve its decomposition efficiency. When discharged, most of the ozone is decomposed into oxygen and flows into the outdoor air.

[0031] Example 2

[0032] In Example 1, to ensure sufficient heat exchange between the high-temperature exhaust gas and ozone and to achieve complete ozone decomposition, it is necessary to increase the heat exchange time between the two gases. This can be achieved by extending the length of the duct structure or reducing the ozone flow rate. However, extending the length of the duct structure is limited by the size of the production site and cost control. At the same time, the end temperature of the high-temperature exhaust gas in the extended duct structure does not significantly improve the decomposition efficiency. Reducing the ozone flow rate cannot meet the production needs.

[0033] Therefore, in this embodiment, as Figure 5-7 As shown, the structure of the gas inlet section and the gas outlet section in the duct structure is maintained, and continuous turbulence pleats 6 are set on both sides of the interlayer space of each small section of the duct. That is, continuous turbulence pleats 6 are fixed on the outer side wall of the inner pipe 1 and the inner side wall of the outer pipe 2. The continuous turbulence pleats 6 have a wave shape, and the troughs and peaks of the two continuous turbulence pleats 6 located on the two side walls are staggered, that is, the trough of one continuous turbulence pleat 6 corresponds to the peak of another continuous turbulence pleat 6. The staggered arrangement of the troughs and peaks of the two continuous turbulence pleats 6 greatly extends the ozone passage and the heat exchange area.

[0034] Ozone gas discharged from the corona machine inevitably contains impurity particles, which are easily deposited in the interlayer cavity under the action of continuous turbulence folds 6. To this end, we divide the outer tube 2 into upper and lower parts and hinge them along one side, and connect the joint on the other side with a quick-release locking structure. A high-temperature resistant sealing ring 8 is set at the joint of the upper and lower parts to ensure airtightness.

[0035] The quick-release locking structure includes an upper locking block 10 and a lower locking block 9 connected to the upper and lower parts of the outer tube 2. The lower locking block 9 has a locking thread. A wing bolt 11 is vertically inserted through the upper locking block 10. The wing bolt 11 is threadedly connected to the lower locking block 9. A spring 12 is sleeved on the outer periphery of the middle part of the wing bolt 11. The two ends of the spring 12 abut against the wing bolt 11 and the upper locking block 10, respectively.

[0036] At this time, one side of the support ring 5 is fixed to one of the pipe walls of the two pipes, and the other side is attached and fixed with a graphite layer 7, which slides with the other pipe wall; thus, when the outer pipe 2 is opened for cleaning, it is convenient to rotate the inner pipe 1 and the outer pipe 2 of each small section of the pipe to an angle that is convenient for cleaning.

[0037] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A duct structure for decomposing ozone, characterized by: The application relates to a high-temperature exhaust gas treatment device, which comprises a plurality of connected pipe sections, each pipe section comprising an inner pipe (1) and an outer pipe (2) arranged concentrically, the inner pipe (1) and the outer pipe (2) forming a uniform interlayer space, high-temperature exhaust gas entering the inner pipe (1) of a pipe section at one end and being discharged from the inner pipe (1) of a pipe section at the other end, at least one ozone inlet pipe (3) being connected to the pipe section close to the high-temperature exhaust gas inlet end and communicating with the interlayer space, and at least one decomposition outlet pipe (4) being connected to the pipe section close to the low-temperature exhaust gas discharge end.

2. The duct structure according to claim 1, wherein Three supporting rings (5) are arranged at equal angles at the middle cross-section position between the inner pipe (1) and the outer pipe (2), the three supporting rings (5) abutting against the two pipe walls, and the three supporting rings (5) being fixed with at least one of the pipe walls of the inner pipe (1) and the outer pipe (2).

3. The duct structure of claim 1, wherein The decomposition outlet pipe (4) tangentially communicates with the interlayer space along the outer pipe (2).

4. The duct structure of claim 2, wherein Continuous turbulence corrugations (6) are arranged on the two side walls of the interlayer space, the continuous turbulence corrugations (6) being in a wave shape, and the troughs and crests of the two continuous turbulence corrugations (6) being staggered.

5. The duct structure of claim 4, wherein The outer pipe (2) comprises two semicircular arc portions, the two semicircular arc portions being hinged along one coincident side edge, the other side edge being connected through a quick-release locking structure, and a high-temperature-resistant sealing ring (8) being arranged at the joint of the two semicircular arc portions.

6. The duct structure of claim 5, wherein The quick-release locking structure comprises an upper locking block (10) and a lower locking block (9) fixed at the corresponding positions of the two portions of the outer pipe (2), a butterfly bolt (11) being arranged in the upper locking block (10) in a penetrating mode, the butterfly bolt (11) being threadedly connected with the lower locking block (9), a spring (12) being arranged on the outer periphery of the middle portion of the butterfly bolt (11), and the two ends of the spring (12) abutting against the butterfly bolt (11) and the upper locking block (10) respectively.

7. The duct structure of claim 2, wherein A graphite layer (7) is arranged on the side of the three supporting rings (5) away from the fixed end, and the graphite layer (7) is in sliding fit with the corresponding pipe wall.

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