Polyester tail gas treatment device

Abstract

The utility model relates to a polyester tail gas treatment device which comprises a leaching tower, a production water supply unit and a waste liquid treatment tower, the leaching tower is provided with a first inlet, a second inlet and an outlet, the production water supply unit is communicated with the second inlet of the leaching tower, and a cooling unit is arranged on a first pipeline; the waste liquid treatment tower inlet is communicated with the leaching tower outlet; the waste liquid treatment tower outlet is communicated with the first pipeline through a third pipeline; a nozzle is arranged in the leaching tower and / or the waste liquid treatment tower and comprises a fixed part, a guide part and a connecting part for connecting the fixed part and the guide part, the fixed part is provided with a circulation channel extending in the vertical direction, the guide part is located below the fixed part, and the guide part protrudes in the direction close to the circulation channel of the fixed part; and a liquid through hole communicated with the circulation channel is formed in the guide part. According to the polyester tail gas treatment device provided by the utility model, fresh water or recycled water is saved, energy is saved, and the environment-friendly requirement is met; the nozzles are arranged, so that the gas-liquid contact time is prolonged, full contact is achieved, and the tail gas treatment effect is good.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of polyester tail gas treatment device. BACKGROUND

[0002] Polyester tail gas spray tower is a kind of gas purification treatment equipment, is widely used in industrial waste gas purification, dust removal and other aspects of pretreatment, and the purification effect is very good.

[0003] The spray tower mainly captures acetaldehyde, ethylene glycol and other organic matters in polyester tail gas by spraying, and the process wastewater from the spray tower is discharged after entering the polyester waste liquid treatment tower. Fresh water or recycled water is used for spraying in the spray tower, which not only consumes fresh water or recycled water, but also increases the amount of process wastewater generated by polyester, increasing the cost of later treatment. In addition, the nozzles in the spray tower and the waste liquid treatment tower are hollow cylinders, and the liquid flows out of the nozzle at a high speed, resulting in short contact time between the liquid and the tail gas, and poor tail gas treatment effect. SUMMARY

[0004] The utility model discloses a kind of polyester tail gas treatment device.

[0005] To achieve the above purpose, the utility model adopts the technical scheme that

[0006] A polyester tail gas treatment device, comprising a spray tower, a production water supply unit, a waste liquid treatment tower,

[0007] The spray tower has a first inlet, a second inlet and an outlet, the first inlet is arranged lower than the second inlet, and a tail gas supply unit is communicated with the first inlet.

[0008] The production water supply unit is communicated with the second inlet of the spray tower through a first pipeline, for supplying production water to the spray tower, and a cooling unit is arranged on the first pipeline.

[0009] The inlet of the waste liquid treatment tower is communicated with the outlet of the spray tower through a second pipeline, and the outlet of the waste liquid treatment tower is communicated with the first pipeline through a third pipeline.

[0010] The spray tower and / or the waste liquid treatment tower are provided with nozzles, the nozzles include a fixed part, a guide part and a connecting part connecting the fixed part and the guide part, the fixed part has a flow-through channel extending in the vertical direction, the guide part is located below the fixed part, the guide part protrudes towards the flow-through channel close to the fixed part, and a liquid passage hole is formed in the guide part and penetrates the flow-through channel.

[0011] According to some embodiments of the utility model, the connecting part includes a first connecting piece and a second connecting piece, the first connecting piece is used for connecting the inner wall of the flow channel of the fixed part and the top of the guide part, and the second connecting piece connects the lower part of the fixed part and the outer side of the guide part.

[0012] According to some embodiments of the utility model, the first connecting piece includes a plurality of horizontal columns and a vertical column, the vertical column is arranged at the top of the guide part, the opposite ends of the horizontal column are connected with the inner wall of the flow channel of the fixed part and the upper end of the vertical column respectively, and the lower end of the vertical column is connected with the top of the guide part.

[0013] According to some embodiments of the utility model, the second connecting piece is provided with a plurality of second connecting pieces; the second connecting piece is arranged in parallel with the vertical column.

[0014] According to some embodiments of the utility model, on the same projection plane, the projection area of the guide part is greater than that of the fixed part.

[0015] According to some embodiments of the utility model, the guide part is in the form of a convex arc, and the convex arc protrudes towards the direction of the flow channel of the fixed part.

[0016] According to some embodiments of the utility model, the guide part is in the form of a triangular pyramid.

[0017] According to some embodiments of the utility model, the fixed part is in the form of a hollow cylinder.

[0018] According to some embodiments of the utility model, the liquid passage is provided with a plurality of liquid passages, and the plurality of liquid passages are distributed from the center of the guide part to the edge thereof.

[0019] According to some embodiments of the utility model, the device further includes a blowdown pipeline, the blowdown pipeline is in communication with the third pipeline and the sewage treatment station, and / or a collecting tank is arranged on the pipeline in communication between the inlet of the waste liquid treatment tower and the outlet of the elution tower.

[0020] Compared with the prior art, the utility model has the following advantages due to the above technical scheme:

[0021] The polyester tail gas treatment device provided by the utility model discloses the outlet of the waste liquid treatment tower is in communication with the first pipeline, the waste liquid treated through the waste liquid treatment tower first enters the first pipeline, is cooled down and then is introduced into the elution tower to contact with the tail gas in the elution tower, realizes circulation flow, can save fresh water or recycled water, saves energy and meets the requirement of environmental protection, the nozzle is arranged, the gas-liquid contact time is prolonged, and the tail gas treatment effect is good. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a structural diagram of the polyester tail gas treatment device provided by the present application; Figure 1 Figure 2 is a structural diagram of the polyester tail gas treatment device provided by the present application from a first perspective; Figure 3 is a structural diagram of the polyester tail gas treatment device provided by the present application from a second perspective;

[0023] Figure 4 is a structural diagram of the polyester tail gas treatment device provided by the present application from a third perspective; Figure 2 Figure 5 is a structural diagram of the polyester tail gas treatment device provided by the present application from a fourth perspective; Figure 6 is a front view of the nozzle of the polyester tail gas treatment device provided by the present application;

[0024] Figure 7 is a bottom view of the nozzle of the polyester tail gas treatment device provided by the present application; Figure 3 Figure 8 is a structural diagram of the fixed part and the connecting part of the nozzle of the polyester tail gas treatment device provided by the present application; Figure 9 is a front view of the fixed part and the connecting part of the nozzle of the polyester tail gas treatment device provided by the present application;

[0025] Figure 10 is a structural diagram of the elution tower of the polyester tail gas treatment device provided by the present application; Figure 4 Figure 11 is a structural diagram of the waste liquid treatment tower of the polyester tail gas treatment device provided by the present application. Figure 12 is a structural diagram of the waste liquid treatment tower of the polyester tail gas treatment device provided by the present application.

[0026] The above figures: Figure 5

[0027] Figure 6

[0028] Figure 7

[0029] Figure 8

[0030] Figure 9

[0031] Figure 10

[0032] Figure 11

[0033] The above figures:

[0034] ​​​​​​​​​1-elution tower; 2-production water supply unit; 3-waste liquid treatment tower, 301-first opening, 302-second opening, 303-outlet; 4-nozzle, 41-fixed part, 42-guide part, 421-liquid passage hole, 43-cross column, 44-stand column, 45-second connecting piece; 5-drainage pipeline; 6-collecting tank; 7-third pipeline; 8-sewage treatment station; 9-steam supply unit; 11-cooling unit; 12-first pipeline; 13-second pipeline; 14-tail gas supply unit; 15-cooling water inlet pipe; 16-cooling water outlet pipe; 17-fifth pipeline; 18-fan; 19-packing layer; 20-wire mesh demister; 21-spraying distributor. DETAILED DESCRIPTION

[0035] The technical solutions of the present application will be described clearly and completely below in combination with the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0036] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0037] Referring to Figures 1 to 11 The polyester tail gas treatment device shown in the drawing, the device comprises an elution tower 1, a production water supply unit 2, a steam supply unit 9, and a waste liquid treatment tower 3, wherein:

[0038] The elution tower 1 has a first inlet, a second inlet, and an outlet, the first inlet is arranged at a position lower than the second inlet, the tail gas supply unit 14 is in communication with the first inlet through a pipeline, the production water supply unit 2 is in communication with the second inlet of the elution tower 1 through a first pipeline 12, and the production water supply unit 2 is used to supply production water to the elution tower 1; The cooling unit 11 is arranged on the first pipeline 12.

[0039] The elution tower 1 of the example is provided with a plurality of packing layers 19 in sequence along the height direction thereof, and the packing layer 19 is a Pall ring; the waste liquid treatment tower 3 is provided with a plurality of packing layers 19 in sequence along the height direction thereof, and the packing layer 19 is a Pall ring. The packing layer 19 helps the full contact between gas and liquid, increases the gas-liquid contact area, and promotes the mass and heat transfer. The Pall ring is made of ceramic, plastic, metal or the like.

[0040] The production water enters the elution tower 1 and is sprayed downward to form a water film between the Pall ring packing layers of the elution tower 1, and the water film is used to condense, absorb and capture the non-condensable gas and the main organic substances such as acetaldehyde and ethylene glycol which can be dissolved in water in the polyester tail gas to form a waste water solution.

[0041] The waste liquid treatment tower 3 has a first opening 301, a second opening 302 and an outlet 303. The first opening 301 is arranged higher than the second opening 302. The first opening 301 of the waste liquid treatment tower 3 is communicated with the outlet of the elution tower 1 through the second pipeline 13. The second opening 302 of the waste liquid treatment tower 3 is communicated with the steam supply unit 9 (the steam supply unit 9 is used to supply steam) through the fourth pipeline. The outlet 303 is arranged below the second opening 302. The outlet 303 of the waste liquid treatment tower 3 is communicated with the first pipeline 12 through the third pipeline 7.

[0042] The waste water solution discharged from the outlet of the elution tower 1 enters the waste liquid treatment tower 3 from the upper part of the waste liquid treatment tower 3 and flows downward in the waste liquid treatment tower 3. The Pall ring packing in the waste liquid treatment tower 3 forms a water film, gradually exchanges heat with the steam of about 170 DEG C introduced from the bottom of the waste liquid treatment tower 3, and according to the different boiling points, the light component organic substances such as acetaldehyde with a boiling point of 20.8 DEG C are evaporated and collected and then discharged outward, and the liquid from which most of the organic substances are removed flows out through the outlet at the bottom of the waste liquid treatment tower 3 to the third pipeline 7, first passes through the cooling unit 11 of about 8 DEG C to exchange heat and reduce the temperature (to facilitate the condensation and capture of the ethylene glycol mist and the non-condensable gas such as acetaldehyde and the like in the hot tail gas of about 45 DEG C), and then the waste liquid after the temperature reduction is introduced into the elution tower 1 by the production water supply unit 2 to contact with the tail gas in the elution tower 1, so that the circulation is realized, the fresh water or the recycled water is saved, the energy is saved, and the environmental protection requirement is met.

[0043] In the example, the spray nozzles 4 are arranged in the elution tower 1 and / or the waste liquid treatment tower 3. The spray nozzles 4 in the elution tower 1 are communicated with the first pipeline 12. The spray nozzles 4 include a fixed part 41, a guide part 42, and a connecting part connecting the fixed part 41 and the guide part 42. The fixed part 41 has a flow passage extending in the vertical direction, and the upper end and the lower end of the flow passage are both open. The guide part 42 is located below the fixed part 41, and the guide part 42 protrudes towards the flow passage close to the fixed part 41. The guide part 42 has an inclined surface inclined downward away from the fixed part 41. The guide part 42 is provided with a liquid passage hole 421 penetrating the flow passage. The production water is discharged downward from the fixed part 41 through the liquid passage hole 421. The guide part 42 is arranged to block the liquid flowing out of the fixed part 41. The polyester tail gas is blocked by the guide part 42, the residence time is prolonged, the liquid and the gas are fully contacted, and the tail gas treatment effect is good. The function of the spray nozzles 4 in the waste liquid treatment tower 3 is to prolong the contact time of the steam and the waste water solution.

[0044] In some embodiments, the top of the guide part 42 extends into the flow passage of the fixed part 41, and the lower part of the guide part 42 is located outside the fixed part 41. The lower part of the guide part 42 and the lower end of the fixed part 41 are kept apart by a gap, which is beneficial for more production water to flow out.

[0045] In some embodiments, the connecting part includes a first connecting piece and a second connecting piece 45. The first connecting piece is used to connect the inner wall of the flow passage of the fixed part 41 and the top of the guide part 42. The second connecting piece 45 connects the lower part of the fixed part 41 and the outside of the guide part 42, so that the lower part of the guide part 42 and the lower end of the fixed part 41 are kept apart by a gap.

[0046] Referring to Figures 2-9 , the first connecting piece includes a plurality of horizontal columns 43 and a vertical column 44. The vertical column 44 is arranged at the top of the guide part 42. The opposite ends of the horizontal columns 43 are connected with the inner wall of the flow passage of the fixed part 41 and the upper end of the vertical column 44, respectively. The lower end of the vertical column 44 is connected with the top of the guide part 42. The vertical column 44 extends in the vertical direction.

[0047] In a preferred embodiment, when the fixed part 41 is in the form of a hollow cylinder, the plurality of horizontal columns 43 are distributed radially along the inner periphery of the fixed part 41, and the extension direction of the vertical column 44 is consistent with the center line of the inner periphery of the fixed part 41, so that the structure is stable. The second connecting piece 45 extends in the vertical direction and is parallel to the vertical column 44. The second connecting piece 45 is provided with a plurality of second connecting pieces 45, and the plurality of second connecting pieces 45 are arranged in a circle around the fixed part 41.

[0048] In some embodiments, the projection area of the guide part 42 is greater than the projection area of the fixed part 41 on the same projection plane, that is, the outer edge of the guide part 42 exceeds the fixed part 41. The advantage of such arrangement is that the number of air holes is large, the diffusion range is large, and the gas-liquid contact time is greatly prolonged.

[0049] In some embodiments, the guide portion 42 is in the shape of a convex arc, the convex arc protrudes towards the fixed portion 41, the projection of the guide portion 42 on the horizontal plane is in the shape of a circle; when the fixed portion 41 is in the shape of a hollow cylinder, the center line of the guide portion 42 is coaxial with the center line of the fixed portion 41. Or the guide portion 42 is in the shape of a triangular pyramid.

[0050] In this example, the liquid passage 421 is provided with a plurality of liquid passages 421, which are distributed from the center of the guide portion 42 to the edge thereof; when the guide portion 42 is in the shape of a convex arc, a plurality of hole portions are distributed from the center of the guide portion 42 to the edge thereof, and each hole portion comprises a plurality of liquid passages 421 in the shape of a ring.

[0051] In some embodiments, the device further comprises a blowdown pipeline 5, which is in communication with the third pipeline 7 and the sewage treatment station 8; the waste liquid discharged from the waste liquid treatment tower 3 can flow into the leaching tower 1 through the third pipeline 7 and the first pipeline 12, and the remaining part flows into the sewage treatment tower 8 for treatment.

[0052] In this example, a collection tank 6 is arranged between the inlet of the waste liquid treatment tower 3 and the outlet of the leaching tower 1; the waste water solution discharged from the outlet of the leaching tower 1 enters the collection tank 6, the collection tank 6 receives impurities, and buffers the waste water solution before entering the waste liquid treatment tower 3.

[0053] In this example, the cooling unit 11 can be a plate heat exchanger.

[0054] In some embodiments, the device further comprises a fifth pipeline 17, which is in communication with the tail gas supply unit 14; a fan 18 is arranged on the fifth pipeline 17; when the leaching tower 1 is maintained, the tail gas flows to other treatment equipment through the fifth pipeline 17.

[0055] The advantages of the polyester tail gas treatment device of this example are as follows: the outlet of the waste liquid treatment tower is in communication with the first pipeline; the waste liquid treated by the waste liquid treatment tower first enters the first pipeline, is cooled, and then is introduced into the leaching tower to contact with the tail gas in the leaching tower, so that the circulation flow is realized, fresh water or recycled water can be saved, energy can be saved, and the environmental protection requirements can be met; the nozzle is arranged to prolong the residence time of the flowing liquid, so that the liquid and the polyester tail gas are fully contacted, and the tail gas treatment effect is good.

[0056] The above examples are only for illustrating the technical concept and characteristics of the present application, the purpose is to enable the person skilled in the art to understand the content of the present application and to implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and essence of the present application shall be covered within the protection scope of the present application.

Claims

1. A polyester off-gas treatment apparatus, characterized by, The device comprises a rinsing tower, a production water supply unit, and a waste liquid treatment tower, wherein the rinsing tower has a first inlet, a second inlet, and an outlet, the first inlet is arranged at a lower position than the second inlet, and a tail gas supply unit is in communication with the first inlet; The production water supply unit is in communication with the second inlet of the rinsing tower through a first pipeline, and is used for supplying production water to the rinsing tower, and a cooling unit is arranged on the first pipeline; The inlet of the waste liquid treatment tower is in communication with the outlet of the rinsing tower through a second pipeline, and the outlet of the waste liquid treatment tower is in communication with the first pipeline through a third pipeline; The rinsing tower and / or the waste liquid treatment tower is / are provided with a nozzle, the nozzle comprises a fixed part, a guide part, and a connecting part connecting the fixed part and the guide part, the fixed part has a flow passage extending in a vertical direction, the guide part is located below the fixed part, the guide part protrudes towards the flow passage of the fixed part, and a liquid passage hole is formed in the guide part and penetrates the flow passage.

2. The polyester off-gas treatment apparatus according to claim 1, characterized by The connecting part comprises a first connecting piece and a second connecting piece, the first connecting piece is used for connecting the inner wall of the flow passage of the fixed part and the top of the guide part, and the second connecting piece connects the lower part of the fixed part and the outer side of the guide part.

3. The polyester off-gas treatment apparatus according to claim 2, characterized by The first connecting piece comprises a plurality of horizontal columns and a vertical column, the vertical column is arranged at the top of the guide part, opposite ends of the horizontal columns are respectively connected to the inner wall of the flow passage of the fixed part and the upper end of the vertical column, and the lower end of the vertical column is connected to the top of the guide part.

4. The polyester off-gas treatment apparatus according to claim 3, characterized by The second connecting piece is arranged in plurality, and is arranged in parallel with the vertical column.

5. The polyester off-gas treatment apparatus according to claim 1, characterized by The projection area of the guide part is greater than the projection area of the fixed part on the same projection plane.

6. The polyester off-gas treatment apparatus according to claim 1, characterized by The guide part is in the form of a convex arc, and the convex arc protrudes towards the flow passage of the fixed part.

7. The polyester off-gas treatment apparatus according to claim 1, characterized by The guide part is in the form of a triangular pyramid.

8. The polyester off-gas treatment apparatus according to claim 1, characterized by The fixed part is in the form of a hollow cylinder.

9. The polyester off-gas treatment device according to claim 1, characterized by The liquid passage hole is arranged in plurality, and the plurality of liquid passage holes are distributed from the center of the guide part to the edge thereof.

10. The polyester off-gas treatment device according to claim 1, characterized by The device further comprises a blowdown pipeline, the blowdown pipeline is in communication with the third pipeline and a sewage treatment station, and / or a collecting tank is arranged on the pipeline in communication with the outlet of the rinsing tower and the inlet of the waste liquid treatment tower.

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