A styrene plant shutdown cooking wastewater treatment device

Abstract

The utility model discloses a kind of styrene device shutdown cooking wastewater treatment devices, it is related to styrene production wastewater treatment technical field, the device includes pipeline switching mechanism, ethylbenzene unit treatment tank and styrene unit treatment tank, the downstream end of the ethylbenzene unit treatment tank is provided with ethylbenzene unqualified cooler, the downstream end of the styrene unit treatment tank is provided with styrene unqualified cooler, the downstream end of the ethylbenzene unqualified cooler and styrene unqualified cooler is connected with pipeline switching mechanism. The utility model realizes flexible switching of working condition by pipeline switching mechanism, and the switching seat on its base cooperates with the connecting rod driven by hydraulic cylinder, which can drive the first sealing plug and the second sealing plug to accurately control the on-off of the first liquid outlet pipe and the second liquid outlet pipe, adapt to shutdown processing and normal production requirements, and do not need to change the original system.

Description

Technical Field

[0001] This utility model relates to the field of styrene production wastewater treatment technology, specifically a styrene plant shutdown cooking wastewater treatment device. Background Technology

[0002] The styrene plant system injects DNBP. When the plant is shut down for cooking operations, wastewater containing hydrocarbons such as benzene, ethylbenzene, styrene, and DNBP is generated. In existing technology, the treatment process for this type of wastewater involves first sending it to an intermediate tank within the plant for settling and dehydration. The resulting wastewater is yellow due to the presence of the aforementioned pollutants and exceeds the non-methane total hydrocarbon standard. It then needs to be temporarily stored in a non-compliant ethylbenzene tank and a dehydrogenation liquid tank, respectively, through non-compliant ethylbenzene and styrene coolers. Currently, there is no specific treatment path to achieve compliance.

[0003] Existing wastewater treatment equipment suffers from poor adaptability to operating conditions. It cannot flexibly switch wastewater treatment paths according to the different needs of normal production and shutdown cooking of styrene plants. It can only discharge wastewater into intermediate storage tanks such as unqualified ethylbenzene tanks, resulting in a large amount of wastewater with excessive hydrocarbon content remaining in the tanks and unable to be treated when the plant is shut down.

[0004] Based on this, a wastewater treatment device for styrene plant shutdown is now provided, which can eliminate the drawbacks of existing devices. Utility Model Content

[0005] The purpose of this invention is to provide a device for treating cooking wastewater during shutdown of a styrene plant, in order to solve the problem of poor adaptability to operating conditions in the prior art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A wastewater treatment device for styrene plant shutdown includes a pipeline switching mechanism, an ethylbenzene unit treatment tank and a styrene unit treatment tank. An ethylbenzene non-conforming cooler is installed at the downstream end of the ethylbenzene unit treatment tank, and a styrene non-conforming cooler is installed at the downstream end of the styrene unit treatment tank.

[0008] The downstream ends of both the ethylbenzene non-conforming cooler and the styrene non-conforming cooler are connected to a pipeline switching mechanism. The downstream ends of the pipeline switching mechanism are respectively connected to a DM / water separator and a non-conforming ethylbenzene tank. A coalescer is installed at the downstream end of the DM / water separator, a stripping tower is installed at the downstream end of the coalescer, a wastewater cooler is installed at the downstream end of the stripping tower, and a wastewater pipeline is installed at the downstream end of the wastewater cooler.

[0009] Based on the above technical solutions, this utility model also provides the following optional technical solutions:

[0010] In one alternative embodiment: the pipeline switching mechanism includes a base, a switching seat is provided on the top of the base, an inlet pipe is provided at one end of the switching seat, a first outlet pipe and a second outlet pipe are provided at the other end of the switching seat, a connecting rod is slidably installed inside the switching seat, a first sealing plug and a second sealing plug are provided on the outside of the connecting rod, one end of the connecting rod passes through the switching seat and is connected to a hydraulic cylinder, and the hydraulic cylinder is fixedly installed with the base.

[0011] In one alternative: the inlet pipe is connected to the ethylbenzene non-conforming cooler and the styrene non-conforming cooler respectively, the first outlet pipe is connected to the DM / water separator, and the second outlet pipe is connected to the non-conforming ethylbenzene tank.

[0012] In one alternative: a push plate is fixedly mounted on the outside of the hydraulic cylinder, a fixing plate is fixedly mounted on the top of the base, and a sealing mechanism is provided on one side of the fixing plate.

[0013] In one alternative embodiment: the sealing mechanism includes a first airbag and a second airbag. The first airbag is disposed on one side of the fixed plate, and a first air guide tube is disposed on one side of the first airbag. One end of the first air guide tube passes through the switching seat and the connecting rod and is connected to two first sealing rings. The two first sealing rings are sleeved on the outside of the second sealing plug.

[0014] In one alternative: the second airbag is disposed on one side of the switching seat, and a second air guide tube is disposed on one side of the second airbag. One end of the second air guide tube passes through the switching seat and the connecting rod and is connected to two second sealing rings. The two second sealing rings are sleeved on the outside of the first sealing plug.

[0015] In one alternative: both the first airbag and the second airbag are adapted to the push plate.

[0016] In one alternative: the first sealing plug is adapted to the first liquid outlet tube, and the second sealing plug is adapted to the second liquid outlet tube.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] 1. This utility model achieves flexible switching of working conditions through a pipeline switching mechanism. The switching seat on its base, together with the connecting rod driven by the hydraulic cylinder, can drive the first sealing plug and the second sealing plug to accurately control the opening and closing of the first liquid outlet pipe and the second liquid outlet pipe, adapting to the needs of shutdown processing and normal production, without the need to modify the original system.

[0019] 2. The process of this utility model is complete and efficient. The wastewater from the ethylbenzene unit treatment tank and the styrene unit treatment tank is cooled by the ethylbenzene non-conforming cooler and the styrene non-conforming cooler, and then can be treated to meet the standards through the DM / water separator, coalescer, stripping tower and wastewater cooler, and finally discharged into the wastewater pipe network. This effectively solves the problems of the inability to treat excessive wastewater during shutdown and the water accumulation in the intermediate tank causing water to be carried into the feed when starting up in the traditional technology. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the pipeline switching mechanism of this utility model.

[0021] Figure 2 This is a cross-sectional view of the switching seat of this utility model.

[0022] Figure 3 This is a schematic diagram of the sealing mechanism of this utility model.

[0023] Figure 4 This is a schematic diagram of the workflow structure of this utility model.

[0024] Figure reference numerals: 1. Pipeline switching mechanism; 2. Switching seat; 3. Inlet pipe; 4. First outlet pipe; 5. Second outlet pipe; 6. Connecting rod; 7. First sealing plug; 8. Second sealing plug; 9. Hydraulic cylinder; 10. Fixing plate; 11. Push plate; 12. Sealing mechanism; 121. First airbag; 122. First air guide pipe; 123. First sealing ring; 124. Second airbag; 125. Second air guide pipe; 126. Second sealing ring; 13. Ethylbenzene unit treatment tank; 14. Ethylbenzene non-conforming cooler; 15. Styrene unit treatment tank; 16. Styrene non-conforming cooler; 17. Non-conforming ethylbenzene tank; 18. DM / water separator; 19. Coalescer; 20. Stripping tower; 21. Wastewater cooler; 22. Wastewater pipeline network; 23. Base. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0026] In one embodiment, such as Figures 1-4 As shown, a wastewater treatment device for styrene plant shutdown includes a pipeline switching mechanism 1, an ethylbenzene unit treatment tank 13 and a styrene unit treatment tank 15. An ethylbenzene non-conforming cooler 14 is installed at the downstream end of the ethylbenzene unit treatment tank 13, and a styrene non-conforming cooler 16 is installed at the downstream end of the styrene unit treatment tank 15.

[0027] The downstream ends of both the ethylbenzene non-conforming cooler 14 and the styrene non-conforming cooler 16 are connected to the pipeline switching mechanism 1. The downstream ends of the pipeline switching mechanism 1 are respectively connected to the DM / water separator 18 and the non-conforming ethylbenzene tank 17. A coalescer 19 is installed at the downstream end of the DM / water separator 18. A stripping tower 20 is installed at the downstream end of the coalescer 19. A wastewater cooler 21 is installed at the downstream end of the stripping tower 20. A wastewater pipeline network 22 is installed at the downstream end of the wastewater cooler 21.

[0028] In this embodiment, the pipeline switching mechanism 1 enables flexible switching of operating conditions. The switching seat 2 on its base 23, in conjunction with the connecting rod 6 driven by the hydraulic cylinder 9, can drive the first sealing plug 7 and the second sealing plug 8 to precisely control the opening and closing of the first liquid outlet pipe 4 and the second liquid outlet pipe 5, adapting to the needs of shutdown treatment and normal production, without requiring modification to the original system. The treatment process is complete and efficient. The wastewater from the ethylbenzene unit treatment tank 13 and the styrene unit treatment tank 15 is cooled by the ethylbenzene non-conforming cooler 14 and the styrene non-conforming cooler 16, and can then be treated to meet standards through the DM / water separator 18, the coalescer 19, the stripping tower 20, and the wastewater cooler 21 before being discharged into the wastewater pipeline network 22. This effectively solves the problems of untreated wastewater exceeding standards during shutdown and water accumulation in intermediate tanks leading to water carryover during startup in traditional technologies.

[0029] In one embodiment, such as Figure 2 and Figure 4As shown, the pipeline switching mechanism 1 includes a base 23, a switching seat 2 on the top of the base 23, an inlet pipe 3 at one end of the switching seat 2, and a first outlet pipe 4 and a second outlet pipe 5 at the other end of the switching seat 2. A connecting rod 6 is slidably installed inside the switching seat 2, and a first sealing plug 7 and a second sealing plug 8 are respectively installed on the outside of the connecting rod 6. One end of the connecting rod 6 passes through the switching seat 2 and is connected to a hydraulic cylinder 9, and the hydraulic cylinder 9 is fixedly installed to the base 23. The inlet pipe 3 is connected to the ethylbenzene non-conforming cooler 14 and the styrene non-conforming cooler 16, respectively. The first outlet pipe 4 is connected to the DM / water separator 18, and the second outlet pipe 5 is connected to the non-conforming ethylbenzene tank 17. The first sealing plug 7 is connected to the first outlet pipe 8. The pipe 4 is adapted, the second sealing plug 8 is adapted to the second outlet pipe 5, and the inlet pipe 3 at one end of the switching seat 2 can efficiently collect the wastewater transported by the ethylbenzene non-conforming cooler 14 and the styrene non-conforming cooler 16. The first outlet pipe 4 and the second outlet pipe 5 at the other end are precisely connected to the DM / water separator 18 and the non-conforming ethylbenzene tank 17, respectively. The connecting rod 6, which is slidably installed inside the switching seat 2, can move flexibly under the drive of the hydraulic cylinder 9. The first sealing plug 7 and the second sealing plug 8 set outside the connecting rod 6 can be precisely adapted to the first outlet pipe 4 and the second outlet pipe 5, respectively. With the fixed installation structure of the hydraulic cylinder 9 and the base 23, the pipeline on / off can be quickly switched under the two working conditions, ensuring that the wastewater can flow precisely to the corresponding treatment path according to the production needs, and improving the flexibility and reliability of the process switching.

[0030] In one embodiment, such as Figure 2 and Figure 3As shown, a push plate 11 is fixedly installed on the outside of the hydraulic cylinder 9, and a fixing plate 10 is fixedly installed on the top of the base 23. A sealing mechanism 12 is provided on one side of the fixing plate 10. The sealing mechanism 12 includes a first airbag 121 and a second airbag 124. The first airbag 121 is located on one side of the fixing plate 10, and a first air guide pipe 122 is provided on one side of the first airbag 121. One end of the first air guide pipe 122 passes through the switching seat 2 and the connecting rod 6 and is connected to two first sealing rings 123. The two first sealing rings 123 are sleeved on the outside of the second sealing plug 8. The second airbag 124 is located on one side of the switching seat 2, and a second air guide pipe 125 is provided on one side of the second airbag 124. One end of the second air guide pipe 125 passes through the switching seat 2 and the connecting rod 6 and is connected to two second sealing rings 126. The second sealing ring 126 is sleeved on the outside of the first sealing plug 7. The first airbag 121 and the second airbag 124 are both adapted to the push plate 11. The first airbag 121 in the sealing mechanism 12 is located on one side of the fixed plate 10, and the second airbag 124 is located on one side of the switching seat 2. Both are adapted to the push plate 11. When the push plate 11 moves with the hydraulic cylinder 9, it can selectively squeeze the first airbag 121 or the second airbag 124, so that the gas in the airbag is transported through the corresponding first air guide pipe 122 or second air guide pipe 125 to the two first sealing rings 123 sleeved on the outside of the second sealing plug 8 or the two second sealing rings 126 sleeved on the outside of the first sealing plug 7. This causes the sealing rings to expand and tightly fit the sealing surface, which greatly improves the sealing performance between the sealing plug and the liquid outlet pipe, effectively avoids leakage of wastewater during pipeline switching, and ensures the sealing performance and safety of the device operation.

[0031] The above embodiment discloses a wastewater treatment device for styrene plant shutdown cooking wastewater. The shutdown cooking wastewater generated by the ethylbenzene unit treatment tank 13 and the styrene unit treatment tank 15 is first cooled by the ethylbenzene non-conforming cooler 14 and the styrene non-conforming cooler 16, and then uniformly transported to the inlet pipe 3 of the pipeline switching mechanism 1. When the device is in shutdown treatment mode, the hydraulic cylinder 9 pushes the connecting rod 6, opening the first outlet pipe 4 and sealing the second outlet pipe 5 with the second sealing plug 8. At this time, the push plate 11 simultaneously squeezes the first airbag 121, and the gas inside it is injected into the first sealing ring 123 through the first air guide pipe 122 and expands, thereby strengthening the connection between the second sealing plug 8 and the second outlet pipe 5. The system ensures airtightness to prevent wastewater leakage from the second outlet pipe 5. When the device is in normal production operation, the hydraulic cylinder 9 pulls the connecting rod 6 to reset, allowing the second outlet pipe 5 to open and the first sealing plug 7 to block the first outlet pipe 4. The push plate 11 then squeezes the second airbag 124, and the gas inside it is filled into the second sealing ring 126 through the second air guide pipe 125 and expands, strengthening the airtightness between the first sealing plug 7 and the first outlet pipe 4. The shutdown wastewater that enters the DM / water separator 18 through the first outlet pipe 4 will flow sequentially through the coalescer 19 for oil removal, the stripping tower 20 for stripping hydrocarbon pollutants, and the wastewater cooler 21 for cooling, and finally be transported to the sewage treatment plant through the wastewater pipeline network 22 to achieve standard discharge.

[0032] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A styrene plant shutdown cooking wastewater treatment device, comprising a pipeline switching mechanism (1), an ethylbenzene unit treatment tank (13) and a styrene unit treatment tank (15), wherein an ethylbenzene non-conforming cooler (14) is provided at the downstream end of the ethylbenzene unit treatment tank (13), and a styrene non-conforming cooler (16) is provided at the downstream end of the styrene unit treatment tank (15). Its features are, The downstream ends of the non-conforming ethylbenzene cooler (14) and the non-conforming styrene cooler (16) are both connected to the pipeline switching mechanism (1). The downstream ends of the pipeline switching mechanism (1) are respectively connected to the DM / water separator (18) and the non-conforming ethylbenzene tank (17). The downstream end of the DM / water separator (18) is equipped with a coalescer (19). The downstream end of the coalescer (19) is equipped with a stripping tower (20). The downstream end of the stripping tower (20) is equipped with a wastewater cooler (21). The downstream end of the wastewater cooler (21) is equipped with a wastewater pipeline network (22).

2. The styrene plant shutdown cooking wastewater treatment device according to claim 1, characterized in that, The pipeline switching mechanism (1) includes a base (23), a switching seat (2) is provided on the top of the base (23), an inlet pipe (3) is provided at one end of the switching seat (2), a first outlet pipe (4) and a second outlet pipe (5) are provided at the other end of the switching seat (2), a connecting rod (6) is slidably installed inside the switching seat (2), a first sealing plug (7) and a second sealing plug (8) are provided on the outside of the connecting rod (6), one end of the connecting rod (6) passes through the switching seat (2) and is connected to a hydraulic cylinder (9), and the hydraulic cylinder (9) and the base (23) are fixedly installed.

3. The styrene plant shutdown cooking wastewater treatment device according to claim 2, characterized in that, The inlet pipe (3) is connected to the ethylbenzene non-conforming cooler (14) and the styrene non-conforming cooler (16) respectively, the first outlet pipe (4) is connected to the DM / water separator (18), and the second outlet pipe (5) is connected to the non-conforming ethylbenzene tank (17).

4. A styrene plant shutdown cooking wastewater treatment device according to claim 2, characterized in that, A push plate (11) is fixedly installed on the outside of the hydraulic cylinder (9), and a fixing plate (10) is fixedly installed on the top of the base (23). A sealing mechanism (12) is provided on one side of the fixing plate (10).

5. A styrene plant shutdown cooking wastewater treatment device according to claim 4, characterized in that, The sealing mechanism (12) includes a first airbag (121) and a second airbag (124). The first airbag (121) is disposed on one side of the fixed plate (10). A first air guide tube (122) is disposed on one side of the first airbag (121). One end of the first air guide tube (122) passes through the switching seat (2) and the connecting rod (6) and is connected to two first sealing rings (123). The two first sealing rings (123) are sleeved on the outside of the second sealing plug (8).

6. A styrene plant shutdown cooking wastewater treatment device according to claim 5, characterized in that, The second airbag (124) is located on one side of the switching seat (2). A second air guide tube (125) is provided on one side of the second airbag (124). One end of the second air guide tube (125) passes through the switching seat (2) and the connecting rod (6) and is connected to two second sealing rings (126). The two second sealing rings (126) are sleeved on the outside of the first sealing plug (7).

7. A styrene plant shutdown cooking wastewater treatment device according to claim 6, characterized in that, Both the first airbag (121) and the second airbag (124) are adapted to the push plate (11).

8. A styrene plant shutdown cooking wastewater treatment device according to claim 2, characterized in that, The first sealing plug (7) is adapted to the first liquid outlet pipe (4), and the second sealing plug (8) is adapted to the second liquid outlet pipe (5).

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