Combined system for removing heavy components in plastic processing tail gas

Abstract

The utility model discloses a plastic processing tail gas heavy component removal combination system which comprises a front end collection pretreatment system and a rear end treatment system, the front end collection pretreatment system comprises an air suction cover provided with a first air inlet, and a pre-spraying section connected with the air suction cover and a waste gas collection pipeline; a waste water collecting pipeline is arranged at the joint of the waste gas collecting pipeline and the pre-spraying section, and a circulating spraying mechanism is arranged between the pre-spraying section and the waste water collecting pipeline; the rear-end treatment system comprises a spray tower, a second air inlet is formed in the spray tower, a fluid bed filler and a fixed bed filler are arranged in the spray tower, a second spray pipe is arranged above the two layers of fillers, a second circulating water tank is arranged at the bottom of the spray tower, and the second circulating water tank is connected with the second spray pipe through a spray water pump and a scraper filter; an air outlet is formed in the top of the spray tower. According to the utility model, the tail gas temperature and heavy component content can be reduced at the front end, heavy components are prevented from being adhered to the pipeline, the heavy components in the waste gas are effectively removed by utilizing the rear-end spray tower, and the stable operation of the system is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of tail gas treatment, in particular to a combined system for removing heavy components of tail gas from plastic processing. Background Art

[0002] In industrial production, the exhaust gas produced is of high temperature and contains heavy components. The existing exhaust gas collection system is installed at the plastic outlet of the extruder and only collects the exhaust gas simply. The heavy components in the exhaust gas will adhere to the exhaust gas conveying pipeline after cooling during the transportation process and are difficult to clean. At the same time, the system's back-end processing facilities cannot effectively process the collected exhaust gas, and the condensation of the heavy components will also cause the equipment to fail to operate normally. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a combined system for removing heavy components of tail gas from plastic processing, aiming to solve the technical problems existing in the prior art that the heavy components of tail gas are easy to adhere to the front-end conveying pipeline and are difficult to clean, while the back-end processing facilities cannot effectively remove the heavy components, and the condensation of the heavy components will also affect the normal operation of the equipment.

[0004] The technical scheme of the utility model is: a combined system for removing heavy components of plastic processing tail gas, comprising a front-end collection pretreatment system and a back-end treatment system, wherein the front-end collection pretreatment system comprises an air suction hood provided with a first air inlet, a pre-spraying section connecting the air suction hood and an exhaust gas collection pipe, a wastewater collection pipe is provided at the junction of the exhaust gas collection pipe and the pre-spraying section, a circulating spraying mechanism is provided between the pre-spraying section and the wastewater collection pipe, the circulating water sprayed by the circulating spraying mechanism is fully mixed with the exhaust gas of the pre-spraying section and then recycled and circulated through the wastewater collection pipe for spraying, and the exhaust gas after spraying is output from the exhaust gas collection pipe; the back-end treatment system comprises a spray tower, a second air inlet connected to the exhaust gas collection pipe is provided on one side of the spray tower, a fluidized bed filler and a fixed bed filler are provided from bottom to top in the spray tower, second spray pipes are provided above the two layers of fillers, a second circulating water tank is provided at the bottom of the spray tower, the second circulating water tank is connected to the second spray pipe through a spray water pump and a scraper filter, and an air outlet is provided at the top of the spray tower.

[0005] Furthermore, both ends of the pre-spraying section in the utility model are connected to the air suction hood and the waste gas collection pipe through flexible joints respectively, and the pre-spraying section is arranged to be inclined downward to guide the circulating water into the waste water collection pipe.

[0006] Furthermore, an hourglass-shaped channel is provided inside the pre-spraying section of the utility model.

[0007] Furthermore, the circulating spray mechanism described in the utility model includes a first circulating water tank, a first spray pipe connected to the first circulating water tank through a circulating water pump, the first spray pipe is connected to the middle contraction part of the hourglass-shaped channel in the pre-spray section, and the output end of the wastewater collection pipe is connected to the first circulating water tank.

[0008] Furthermore, in the utility model, an oil scraper is provided in the first circulating water tank, and the oil scraper includes a chain driven by a first reduction motor and an oil scraper plate connected to the chain. An oil tank is provided on one side of the oil scraper, and a sewage outlet connected to the oil tank is provided on the first circulating water tank. A filter is also provided on one side of the first circulating water tank close to the circulating water pump.

[0009] Furthermore, a swirl plate is provided at the bottom of the fluidized bed filler in the utility model.

[0010] Furthermore, in the utility model, a vortex nozzle is provided on the second spray pipe.

[0011] Furthermore, in the utility model, an oil skimming device driven by a second reduction motor is provided in the second circulating water tank, and an oil outlet and a sewage pump are also connected to the second circulating water tank.

[0012] Furthermore, a wire mesh demister is provided below the air outlet in the spray tower described in the utility model.

[0013] Compared with the prior art, the utility model has the following advantages: the utility model can first collect the tail gas and perform pre-spray treatment, reduce the tail gas temperature and remove some of the heavy component pollutants therein, reduce the heavy component content of the tail gas at the front end, and solve the problem of adhesion of the heavy component to the conveying pipeline, while making full use of the length of the collection pipeline to separate the residual water vapor and further cool it; a spray tower is set at the rear end of the system, and the fluidized bed filler cooperates with the bottom cyclone plate to improve the contact efficiency between the exhaust gas and the spray water, and will not clog the filler due to the solidification of the heavy component. The fixed bed filler can further effectively remove the heavy component in the exhaust gas, and the circulating spray water can also effectively filter impurities in the water through the scraper filter to ensure the stable operation of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a front view of the combined system of the utility model (wherein the solid arrow indicates the flow direction of the exhaust gas, and the dotted arrow indicates the flow direction of the wastewater);

[0015] Figure 2 Schematic diagram of the internal structure of the pre-spraying section in the utility model (wherein the solid arrows indicate the flow direction of the exhaust gas, and the dotted arrows indicate the flow direction of the wastewater);

[0016] Figure 3 It is a top view of the first circulating water tank in the utility model;

[0017] Figure 4 It is a side view of the spray tower described in the utility model.

[0018] Among them: 1. first air inlet; 2. air suction hood; 3. pre-spray section; 4. exhaust gas collection pipe; 5. wastewater collection pipe; 6. flexible joint; 7. first circulating water tank; 8. circulating water pump; 9. first spray pipe; 10. oil scraper; 101. first reduction motor; 102. chain; 103. oil scraper plate; 11. oil tank; 12. sewage outlet; 13. filter screen; 14. spray tower; 15. second air inlet; 16. fluidized bed filler; 17. fixed bed filler; 18. swirl plate; 19. second spray pipe; 20. second circulating water tank; 21. spray water pump; 22. scraper filter; 23. air outlet; 24. second reduction motor; 25. oil skimming device; 26. oil outlet; 27. sewage pump; 28. wire mesh demister. DETAILED DESCRIPTION

[0019] The specific implementation of the utility model is described in detail below with reference to the accompanying drawings.

[0020] Example:

[0021] The accompanying drawings show a specific implementation of a combined system for removing heavy components from tail gas from plastic processing according to the present invention. Figure 1 It mainly includes a front-end collection pretreatment system and a back-end treatment system. The front-end collection pretreatment system includes an air suction hood 2 provided with a first air inlet 1, a pre-spraying section 3 connecting the air suction hood 2 and the exhaust gas collection pipe 4, and both ends of the pre-spraying section 3 are respectively connected to the air suction hood 2 and the exhaust gas collection pipe 4 through a flexible joint 6. The inclination angle of the pre-spraying section 3 can be adjusted through the flexible joint 6 to realize the self-flow of the spray water.

[0022] A wastewater collection pipe 5 is provided at the junction of the waste gas collection pipe 4 and the pre-spraying section 3, and a circulating spraying mechanism is provided between the pre-spraying section 3 and the wastewater collection pipe 5. Specifically, Figure 2 As shown, the interior of the pre-spraying section 3 is provided with an hourglass-shaped channel, and the circulating spraying mechanism includes a first circulating water tank 7, a first spraying pipe 9 connected to the first circulating water tank 7 through a circulating water pump 8, the first spraying pipe 9 is connected to the middle contraction part of the hourglass-shaped channel in the pre-spraying section 3, and the output end of the wastewater collecting pipe 5 is connected to the first circulating water tank 7. The pre-spraying section 3 is arranged to be tilted downward, and the circulating water sprayed by the first spraying pipe 9 enters the middle contraction part of the hourglass-shaped channel in the pre-spraying section 3. The circulating water and the exhaust gas are fully mixed by using the Venturi principle, and the exhaust gas after spraying is output from the exhaust gas collecting pipe 4. The circulating water after spraying flows back to the first circulating water tank 7 through the wastewater collecting pipe 5 under the action of gravity.

[0023] Combination Figure 1 , Figure 3An oil scraper 10 is provided in the first circulating water tank 7. The oil scraper 10 includes a chain 102 driven by a first reduction motor 101 and an oil scraper plate 103 connected to the chain 102. The chain 102 is rotated by the first reduction motor 101 to drive the oil scraper plate 103 to regularly scrape the floating oil on the liquid surface of the first circulating water tank 7. An oil tank 11 is provided on one side of the oil scraper 10. A drain port 12 connected to the oil tank 11 is provided on the first circulating water tank 7. The floating oil is scraped into the oil tank 11 and discharged through the drain port 12. A filter screen 13 is provided on one side of the first circulating water tank 7 near the circulating water pump 8 to filter the heavy component pollutants in the circulating water to prevent the pollutants from clogging the circulating water pump 8.

[0024] The back-end treatment system includes a spray tower 14. A second air inlet 15 connected to the exhaust gas collection pipe 4 is provided on one side of the spray tower 14. The pre-treated exhaust gas is sent to the back-end spray tower 14 for treatment. The spray tower 14 is provided with a fluidized bed filler 16 and a fixed bed filler 17 from bottom to top. A cyclone plate 18 is provided at the bottom of the fluidized bed filler 16. By increasing the gas mixing flow, the contact area between the exhaust gas and the spray water can be increased, the contact efficiency can be improved, and the removal rate of the heavy components can be increased.

[0025] A second spray pipe 19 (not shown) is provided above the fluidized bed filler 16 and the fixed bed filler 17. The second spray pipe 19 is provided with a vortex nozzle. The vortex nozzle is a prior art with a large nozzle diameter, which can increase the spray intensity and prevent the nozzle from being blocked.

[0026] A second circulating water tank 20 is provided at the bottom of the spray tower 14, and the second circulating water tank 20 is connected to the second spray pipe 19 through a spray water pump 21 and a scraper filter 22. The scraper filter 22 is a prior art that can effectively filter impurities in the circulating water to prevent nozzle clogging.

[0027] The second circulating water tank 20 is also provided with an oil skimming device 25 driven by a second reduction motor 24. The second circulating water tank 20 is connected with an oil outlet 26 and a sewage pump 27. The heavy components washed are scraped into an oil tank (the oil tank is not shown) by the oil skimming device 25 and then discharged through the oil outlet 26. The sewage pump 27 can drain water regularly to ensure the cleanliness of the spray water.

[0028] An air outlet 23 is provided at the top of the spray tower 14, and a wire mesh demister 28 is provided below the air outlet 23 in the spray tower 14. The wire mesh demister 28 can remove large particles of water droplets in the exhaust gas, and the treated exhaust gas is discharged through the air outlet 23.

[0029] Of course, the above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with the technology to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any modifications made according to the spirit of the main technical solution of the utility model should be included in the protection scope of the utility model.

Claims

1. A combined system for removing heavy components from tail gas from plastic processing, characterized in that: The invention comprises a front-end collection pretreatment system and a back-end treatment system, wherein the front-end collection pretreatment system comprises an air suction hood (2) provided with a first air inlet (1), a pre-spraying section (3) connected to the air suction hood (2) and an exhaust gas collection pipe (4), a waste water collection pipe (5) is provided at the connection between the exhaust gas collection pipe (4) and the pre-spraying section (3), a circulating spraying mechanism is provided between the pre-spraying section (3) and the waste water collection pipe (5), the circulating spraying mechanism sprays circulating water which is fully mixed with the exhaust gas of the pre-spraying section (3) and then recycled and sprayed through the waste water collection pipe (5), and the exhaust gas after spraying is discharged from the exhaust gas collection pipe (4) to the exhaust gas collection pipe (5) 4) output; the back-end processing system comprises a spray tower (14), one side of the spray tower (14) is provided with a second air inlet (15) connected to the exhaust gas collection pipe (4), the spray tower (14) is provided with a fluidized bed filler (16) and a fixed bed filler (17) from bottom to top, and a second spray pipe (19) is provided above the two layers of fillers, respectively, a second circulating water tank (20) is provided at the bottom of the spray tower (14), the second circulating water tank (20) is connected to the second spray pipe (19) through a spray water pump (21) and a scraper filter (22), and an air outlet (23) is provided at the top of the spray tower (14).

2. A combined system for removing heavy components from plastic processing tail gas according to claim 1, characterized in that: The two ends of the pre-spraying section (3) are respectively connected to the air suction hood (2) and the waste gas collection pipe (4) through flexible joints (6), and the pre-spraying section (3) is arranged to be inclined downward to guide the circulating water to the waste water collection pipe (5).

3. A combined system for removing heavy components from plastic processing tail gas according to claim 1, characterized in that: An hourglass-shaped channel is provided inside the pre-spraying section (3).

4. A combined system for removing heavy components from plastic processing tail gas according to claim 3, characterized in that: The circulating spray mechanism comprises a first circulating water tank (7), a first spray pipe (9) connected to the first circulating water tank (7) via a circulating water pump (8), the first spray pipe (9) being connected to the middle contraction portion of the hourglass-shaped channel in the pre-spraying section (3), and the output end of the wastewater collection pipe (5) being connected to the first circulating water tank (7).

5. A combined system for removing heavy components from plastic processing tail gas according to claim 4, characterized in that: An oil scraper (10) is provided in the first circulating water tank (7), the oil scraper (10) comprising a chain (102) driven by a first reduction motor (101) and an oil scraper plate (103) connected to the chain (102); an oil tank (11) is provided on one side of the oil scraper (10); a sewage outlet (12) connected to the oil tank (11) is provided on the first circulating water tank (7); and a filter screen (13) is also provided on one side of the first circulating water tank (7) close to the circulating water pump (8).

6. A combined system for removing heavy components from plastic processing tail gas according to claim 1, characterized in that: A swirl plate (18) is provided at the bottom of the fluidized bed filler (16).

7. A combined system for removing heavy components from plastic processing tail gas according to claim 1, characterized in that: The second spray pipe (19) is provided with a vortex spray head.

8. A combined system for removing heavy components from plastic processing tail gas according to claim 1, characterized in that: An oil skimming device (25) driven by a second reduction motor (24) is arranged in the second circulating water tank (20), and an oil outlet (26) and a sewage pump (27) are also connected to the second circulating water tank (20).

9. A combined system for removing heavy components from plastic processing tail gas according to claim 1, characterized in that: A wire mesh demister (28) is provided in the spray tower (14) below the air outlet (23).

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