Plastic extrusion tail gas heavy component removal and fire safety system

Abstract

The utility model provides a kind of plastic extrusion tail gas heavy component removal combustion suppression safety system, it is related to plastic extrusion tail gas treatment technical field, comprising: pretreatment component, pipeline fire extinguishing component and waste gas spraying component.The utility model can be separately pretreated to the tail gas with different heavy component content after collecting tail gas, reduce tail gas temperature and remove part heavy component pollutant, and make full use of the length of collection system pipeline, separate residual water vapor, and further cooling, the waste gas spraying device of rear end can effectively remove heavy component material in waste gas, the design of fluidized bed filler avoids the problem of filler blockage caused by heavy component condensation, equipment long-term operation is stable, routine maintenance workload is less, while configuring pipeline fire extinguishing system, can effectively extinguish the fire caused by oil condensation in pipeline.

Description

Technical Field

[0001] This utility model relates to the field of plastic extrusion exhaust gas treatment technology, and in particular to a safety system for removing heavy components and suppressing flames in plastic extrusion exhaust gas. Background Technology

[0002] In industrial production, the exhaust gas produced is high-temperature and contains heavy components. Existing collection systems only collect and transport the exhaust gas generated from the production line. The heavy components in the exhaust gas condense in the transport pipelines and downstream processing equipment, increasing not only the fire hazard within the pipelines but also the operational load on the downstream processing equipment. Existing exhaust gas collection systems only perform simple collection; the heavy components in the exhaust gas, after cooling during transport, adhere to the exhaust gas transport pipelines and are difficult to clean, increasing the fire hazard. Furthermore, the heavy components in the exhaust gas increase the burden on downstream exhaust gas treatment facilities and may even affect their operation. Therefore, we provide a safety system for removing and suppressing the flame of heavy components in plastic extrusion exhaust gas. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a safety system for removing heavy components in plastic extrusion exhaust gas and suppressing flames.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a safety system for removing and suppressing flames from heavy components in plastic extrusion tail gas, comprising: a pretreatment component, a pipeline fire extinguishing component, and an exhaust gas spraying component.

[0005] In one preferred embodiment, the pretreatment component comprises a suction hood, a heat exchange unit, a filtration mechanism, a first electric valve, a second electric valve, a third electric valve, a fourth electric valve, a first pressure monitoring unit, a second pressure monitoring unit, a third pressure monitoring unit, a fourth pressure monitoring unit, a steam valve, and a drain valve. The heat exchange unit is equipped with a steam interface.

[0006] In a preferred embodiment, the pipeline fire extinguishing assembly comprises a carbon dioxide supply mechanism, a fire alarm, a first solenoid valve, a second solenoid valve, an infrared detector, a temperature monitor, a first delivery pipeline, and a second delivery pipeline.

[0007] In one preferred embodiment, the device comprises an air inlet, a swirl plate, a fluidized bed packing, a vortex nozzle, a fixed bed packing, a wire mesh demister, an automatic slag scraper filter, a spray pump, a slag scraper motor, a second circulating water tank, an oil outlet, and an air outlet.

[0008] In a preferred embodiment, the carbon dioxide supply mechanism comprises a high-pressure carbon dioxide tank, a third solenoid valve, a third delivery pipeline, and a fourth delivery pipeline.

[0009] In a preferred embodiment, the filtration mechanism consists of a first filter and a second filter.

[0010] In a preferred embodiment, a pre-spray section is added to the rear end of the suction hood. Flexible joints are provided at both ends of the pre-spray section. One end of the pre-spray section is connected to an exhaust gas pipe via the flexible joint. One end of the exhaust gas pipe is connected to a wastewater pipe. A first circulating water tank is provided at one end of the wastewater pipe. A filter screen is provided in the first circulating water tank. An oil skimmer is provided on one side of the filter screen. A floating oil scraper is provided on one side of the oil skimmer. A drain outlet is provided at one end of the oil skimmer. A circulating water pump is provided at one end of the first circulating water tank. A spray pipe is provided on the circulating water pump.

[0011] Compared with the prior art, the advantages and positive effects of this utility model are as follows: This invention allows for separate pretreatment of exhaust gases with varying levels of heavy components after exhaust gas collection. This reduces exhaust gas temperature and removes some heavy component pollutants. It also fully utilizes the length of the collection system pipeline to separate residual water vapor and further cool the gas. The exhaust gas spray device at the rear end effectively removes heavy component substances from the exhaust gas. The design of the fluidized bed packing avoids packing blockage caused by the condensation of heavy components. The equipment operates stably for a long time with minimal daily maintenance. Additionally, it is equipped with a pipeline fire extinguishing system to effectively extinguish fires caused by the condensation of sludge and oil in the pipeline. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of a safety system for removing and suppressing flame retardant components from plastic extrusion tail gas, which is provided by this utility model.

[0013] Figure 2 This is a schematic diagram of the filter mechanism structure of a plastic extrusion tail gas recombinant component removal and flame retardant safety system provided by this utility model.

[0014] Figure 3 This invention provides a schematic diagram of the carbon dioxide supply mechanism of a safety system for removing and suppressing flame retardant components from plastic extrusion tail gas.

[0015] Figure 4 This is an enlarged structural diagram of point A of a safety system for removing and suppressing flame retardant components from plastic extrusion tail gas, which is provided by this utility model.

[0016] Legend: 1. Exhaust hood; 2. Heat exchanger; 4. Fire alarm; 5. Infrared detector; 6. Temperature monitor; 7. First conveying pipe; 8. Second conveying pipe; 10. First solenoid valve; 11. Second solenoid valve; 12. Pre-spray section; 13. Flexible joint; 14. Exhaust gas pipe; 15. Wastewater pipe; 16. First circulating water tank; 17. Filter screen; 18. Oil scraper; 19. Floating oil through scraper; 20. Drain outlet; 21. Circulating water pump; 22. Spray pipe; 23. Steam interface; 24. Steam valve; 25. Drain valve; 26. Air inlet; 27. Swirl plate; 28. Moving bed packing; 29. ​​Vortex nozzle; 30. Fixed bed packing; 31. Wire mesh demister; 32. Automatic slag scraper filter; 33. Spray pump; 34. Slag scraper motor; 35. Second circulating water tank; 36. Oil outlet; 37. Air outlet; a1, First pressure monitoring unit; a2, Second pressure monitoring unit; b1, First electric valve; b2, Second electric valve; c1, Third electric valve; c2, Fourth electric valve; d1, Third pressure monitoring unit; d2, Fourth pressure monitoring unit; 3. Filtration mechanism; 301. First filter; 302. Second filter; 9. Carbon dioxide supply mechanism; 901. High-pressure carbon dioxide tank; 902. Third solenoid valve; 903. Third delivery pipe; 904. Fourth delivery pipe. Detailed Implementation

[0017] To more clearly illustrate the overall concept of this utility model, a detailed description will be provided below with reference to the accompanying drawings and examples.

[0018] It should be noted that many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0019] Furthermore, it should be understood in the description of this utility model that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" 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 simplifying the description, 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] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral unit; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. However, specifying a direct connection indicates that the two main bodies at the connection point are not connected by an intermediate structure, but are simply connected to form a whole through a connecting structure. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0021] In this utility model, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first and second features, or indirect contact through an intermediate medium. In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0022] Example 1

[0023] like Figure 1-4 As shown, this utility model provides a technical solution: a safety system for removing and suppressing flames from heavy components in plastic extrusion tail gas, comprising: a pretreatment component, a pipeline fire extinguishing component, and an exhaust gas spraying component; The pretreatment assembly consists of a suction hood 1, a heat exchange unit 2, a filter mechanism 3, a first electric valve b1, a second electric valve b2, a third electric valve c1, a fourth electric valve c2, a first pressure monitoring unit a1, a second pressure monitoring unit a2, a third pressure monitoring unit d1, a fourth pressure monitoring unit d2, a steam valve 24, and a drain valve 25. The heat exchange unit 2 is equipped with a steam interface 23; The pipeline fire extinguishing system consists of a carbon dioxide supply mechanism 9, a fire alarm 4, a first solenoid valve 10, a second solenoid valve 11, an infrared detector 5, a temperature monitor 6, a first delivery pipeline 7, and a second delivery pipeline 8. The exhaust gas spray assembly consists of an air inlet 26, a swirl plate 27, a moving bed packing 28, a vortex nozzle 29, a fixed bed packing 30, a wire mesh demister 31, an automatic scraper filter 32, a spray pump 33, a scraper motor 34, a second circulating water tank 35, an oil outlet 36, and an air outlet 37. The carbon dioxide supply mechanism 9 consists of a high-pressure carbon dioxide tank 901, a third solenoid valve 902, a third delivery pipeline 903, and a fourth delivery pipeline 904; The filtration mechanism 3 consists of a first filter 301 and a second filter 302; A pre-spray section 12 is added to the rear end of the suction hood 1. Flexible joints 13 are provided at both ends of the pre-spray section 12. One end of the pre-spray section 12 is connected to the exhaust gas pipe 14 through the flexible joint 13. One end of the exhaust gas pipe 14 is connected to the wastewater pipe 15. A first circulating water tank 16 is provided at one end of the wastewater pipe 15. A filter screen 17 is provided in the first circulating water tank 16. An oil skimmer 18 is provided on one side of the filter screen 17. A floating oil scraper 19 is provided on one side of the oil skimmer 18. A drain outlet 20 is provided at one end of the oil skimmer 18. A circulating water pump 21 is provided at one end of the first circulating water tank 16. A spray pipe 22 is provided on the circulating water pump 21.

[0024] In this embodiment, a pre-spray section 12 is added to the rear end of the suction hood 1. Flexible joints 13 are used at both ends of the pre-spray section 12 to adjust the tilt angle of the pre-spray section 12 according to the actual site conditions, so as to facilitate the gravity flow of spray water back to the first circulating water tank 16. The interior of the pre-spray section 12 adopts an hourglass design, and the side of the pre-spray section 12 is a spray pipe 22. The spray pipe 22 is inserted into the retracted part of the pre-spray section 12, and the circulating water and exhaust gas are fully mixed by using the Venturi principle. The exhaust gas after spraying is discharged through the exhaust gas pipe 14, and the circulating water after spraying flows into the wastewater pipe 15 under the action of gravity. Inside the first circulating water tank 16, there is an oil skimmer 18. The chain is rotated by a reduction motor, which drives the floating oil to be periodically scraped off the floating oil on the surface of the liquid in the first circulating water tank 16 by a scraper 19. The floating oil is scraped by the scraper 19 to the oil tank and discharged into the sludge tank through the drain outlet 20 for storage. A filter screen 17 is provided near the circulating water pump 21 to filter out heavy component pollutants in the circulating water and prevent pollutants from clogging the circulating water pump 21. A circulating water pump 21 is connected to the side wall of the first circulating water tank 16. The circulating water is input into the pre-spray section 12 for spraying through the spray pipe 22. After being collected by the exhaust hood 1, the exhaust gas is sent to the heat exchanger 2 for cooling. By reducing the temperature of the exhaust gas, heavy components in the exhaust gas are removed. After being cooled by the heat exchanger 2, the exhaust gas enters the filter mechanism 3 for filtration to remove the liquid oil droplets that condense in the exhaust gas. The heavy components will condense in the heat exchanger 2. To ensure the normal operation of the heat exchanger, a steam interface 23 is provided. The pressure is monitored by the first pressure monitoring unit a1 and the second pressure monitoring unit a2. When the heat exchanger 2 is blocked, the first electric valve b1, the second electric valve b2, the third electric valve c1, and the fourth electric valve c2 are controlled to switch to another heat exchanger. At the same time, the steam valve 24 is opened to purge the heat exchanger. The purged sludge is discharged through the drain valve 25.

[0025] When the temperature monitor 6 detects an abnormal temperature inside the pipeline, it interlocks and activates the fire alarm 4 to alert staff that a fire has occurred. At the same time, the temperature monitor 6 interlocks the third solenoid valve 902, the first solenoid valve 10, and the second solenoid valve 11. When a fire is detected inside the pipeline, the third solenoid valve 902, the first solenoid valve 10, and the second solenoid valve 11 are opened, and high-pressure carbon dioxide is sprayed into the pipeline through the third delivery pipeline 903, the fourth delivery pipeline 904, the first delivery pipeline 7, and the second delivery pipeline 8 to extinguish the fire.

[0026] The pretreated exhaust gas is sent to the downstream spray tower for further treatment. The exhaust gas enters the spray tower through the air inlet 26. The spray tower uses a moving bed packing 28 with a swirl plate 27 added to the bottom of the moving bed packing 28. By increasing gas mixing, the contact area between the exhaust gas and the production water is increased, further increasing the removal rate of heavy components. At the same time, the movement of the moving bed packing 28 during operation avoids the problem of heavy components condensing and clogging the packing. A vortex nozzle 29 is used with a large nozzle diameter to increase the spray intensity and prevent nozzle clogging. A two-stage spray is adopted, using a fixed bed packing 30 to further remove heavy components in the exhaust gas. A wire mesh demister 31 is used to remove large water droplets from the exhaust gas. The treated exhaust gas is discharged through the air outlet 37. A scraper motor 34 is installed in the circulating water tank. The heavy components washed off are scraped by the scraper motor 34 into the oil tank and discharged through the oil outlet 36. An automatic scraper filter 32 is installed at the rear end of the spray pump 33 to filter impurities in the circulating water, prevent nozzle clogging, and ensure the cleanliness of the spray water.

[0027] Working principle: like Figure 1-4 As shown, in actual use, the exhaust gas undergoes preliminary treatment via a pretreatment component. The exhaust gas is collected through the suction hood 1 and then enters the heat exchange unit 2 for cooling. In the heat exchange unit, the temperature of the exhaust gas is reduced, and heavy components condense into liquid oil droplets, which are then removed by the filtration mechanism 3. The heat exchanger 2 is equipped with a steam interface 23 for periodic purging to ensure the cleanliness of the equipment. When the heat exchanger becomes clogged, the system automatically switches to the standby heat exchanger and initiates steam purging to remove accumulated oil and grease. Furthermore, the system is equipped with multiple pressure monitoring units to monitor the operating status of each component in real time, ensuring smooth processing.

[0028] The pre-treated exhaust gas will enter the pipeline fire suppression system for safety monitoring. When the temperature monitor 6 inside the pipeline detects an abnormal temperature, it will automatically activate the fire alarm and trigger the high-pressure carbon dioxide fire suppression system. Specifically, it will open the solenoid valve, allowing carbon dioxide to be delivered through the pipeline to extinguish the fire and prevent it from starting. This process ensures safety during exhaust gas treatment and avoids potential fire risks. The entire system is also equipped with multiple solenoid valves and monitoring devices to adjust the system's operating status in real time.

[0029] The exhaust gas enters the spray tower through pipelines for advanced treatment. The spray tower utilizes fluidized bed packing 28 and swirl plates 27 to increase the contact area between gas and water, enhancing the removal efficiency of heavy components. Vortex nozzles 29 increase the spray intensity and prevent nozzle clogging. In the further treatment stage, fixed bed packing 30 and wire mesh demister 31 are used to further remove heavy components and water droplets from the exhaust gas, ensuring that the exhaust gas meets cleanliness standards before emission. The treated exhaust gas is discharged through outlet 37, while the water in the spray tower is cleaned and reused through a circulation system. Wastewater throughout the system is purified, passing through an oil skimmer 18 and a slag skimmer motor 34 to ensure water quality remains uncontaminated, thus guaranteeing the long-term stable operation of the system.

[0030] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; within the framework of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.

[0031] This utility model is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A safety system for removing heavy components in plastic extrusion tail gas and suppressing flames, characterized in that, include: Pretreatment components, pipeline fire suppression components, and exhaust gas sprinkler components; The pretreatment assembly consists of a suction hood (1), a heat exchange unit (2), a filter mechanism (3), a first electric valve (b1), a second electric valve (b2), a third electric valve (c1), a fourth electric valve (c2), a first pressure monitoring unit (a1), a second pressure monitoring unit (a2), a third pressure monitoring unit (d1), a fourth pressure monitoring unit (d2), a steam valve (24), and a drain valve (25). The heat exchange unit (2) is provided with a steam interface (23).

2. The plastic extrusion tail gas heavy component removal and flame retardant safety system according to claim 1, characterized in that: The pipeline fire extinguishing assembly consists of a carbon dioxide supply mechanism (9), a fire alarm (4), a first solenoid valve (10), a second solenoid valve (11), an infrared detector (5), a temperature monitor (6), a first delivery pipeline (7), and a second delivery pipeline (8).

3. The plastic extrusion tail gas heavy component removal and flame retardant safety system according to claim 1, characterized in that: The exhaust gas spray assembly consists of an air inlet (26), a swirl plate (27), a fluidized bed packing (28), a vortex nozzle (29), a fixed bed packing (30), a wire mesh demister (31), an automatic slag scraper filter (32), a spray pump (33), a slag scraper motor (34), a second circulating water tank (35), an oil outlet (36), and an air outlet (37).

4. A safety system for removing heavy components in plastic extrusion tail gas and suppressing flames according to claim 2, characterized in that: The carbon dioxide supply mechanism (9) consists of a high-pressure carbon dioxide tank (901), a third solenoid valve (902), a third delivery pipe (903), and a fourth delivery pipe (904).

5. A safety system for removing heavy components in plastic extrusion tail gas and suppressing flames according to claim 1, characterized in that: The filtration mechanism (3) consists of a first filter (301) and a second filter (302).

6. A safety system for removing heavy components in plastic extrusion tail gas and suppressing flames according to claim 1, characterized in that: A pre-spray section (12) is added to the rear end of the suction hood (1). Both ends of the pre-spray section (12) are provided with flexible joints (13). One end of the pre-spray section (12) is connected to an exhaust gas pipe (14) through the flexible joint (13). One end of the exhaust gas pipe (14) is connected to a wastewater pipe (15). One end of the wastewater pipe (15) is provided with a first circulating water tank (16). A filter screen (17) is provided in the first circulating water tank (16). An oil scraper (18) is provided on one side of the filter screen (17). A floating oil scraper (19) is provided on one side of the oil scraper (18). A drain outlet (20) is provided at one end of the oil scraper (18). A circulating water pump (21) is provided at one end of the first circulating water tank (16). A spray pipe (22) is provided on the circulating water pump (21).

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