Ultralow-content ethylene glycol wastewater recovery equipment for ethylene glycol device

Abstract

The utility model discloses ultra-low-content ethylene glycol wastewater recovery equipment of an ethylene glycol device, which belongs to the technical field of chemical production equipment and is characterized in that the top of a carbon dioxide desorption tower is connected with a tower top air cooler of the carbon dioxide desorption tower through a pipeline, and a thermometer is arranged on the pipeline; the carbon dioxide desorption tower is connected with the carbon dioxide desorption tower reboiler through a pipeline, a flowmeter b and a flow regulating valve b are arranged on a heat source pipeline on the left side of the carbon dioxide desorption tower reboiler, and the carbon dioxide desorption tower vacuum ejector is connected with the carbon dioxide desorption tower through a pipeline; a flow meter a and a flow regulating valve a are arranged on a pipeline for connecting a vacuum ejector of the carbon dioxide desorption tower and the carbon dioxide desorption tower, and the carbon dioxide desorption tower is connected with a tower top air cooler of the carbon dioxide desorption tower through a pipeline. Meanwhile, the waste water treatment capacity is increased, the combustion cost of the device is increased, and energy waste is caused, and the device is mainly applied to the aspect of waste water recovery.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical production equipment, in particular to ultra-low-content ethylene glycol wastewater recovery equipment for an ethylene glycol device. Background Art

[0002] In the ethylene glycol plant, the ultra-low content ethylene glycol wastewater recovery equipment of the ethylene glycol plant is a common equipment, which is used to ensure that the ultra-low content ethylene glycol wastewater of the plant can be recycled and utilized, so as to reduce the fuel cost of the plant. Therefore, the more the ultra-low content ethylene glycol wastewater of the ethylene glycol plant can be recycled, the better the economic benefits of the ethylene glycol plant, which is beneficial to the long-term operation of the ethylene glycol plant.

[0003] The TOC content in the wastewater from the carbon dioxide venting KO tank is high, which causes the content of the discharged wastewater of the ethylene glycol device to exceed the standard. Therefore, it is necessary to increase the discharge volume of the clean condensate to ensure that the TOC in the wastewater meets the standard. However, after cost accounting, this method will not only increase the amount of condensate used, but also increase the wastewater treatment volume and increase the fuel cost of the device, resulting in a certain amount of energy waste and increased operating costs. In response to this phenomenon, the utility model provides an ultra-low content ethylene glycol wastewater recovery device for an ethylene glycol device, which can reduce the excessive discharge of wastewater from the device and reduce operating costs. Utility Model Content

[0004] The utility model aims to provide an ultra-low-content ethylene glycol wastewater recovery device for an ethylene glycol device, so as to solve the problem of petrochemical products remaining on the surface of a vertical pipe dripping when the vertical pipe is evacuated from a tank mouth.

[0005] The present invention innovatively designs a vertical pipe anti-drip liquid collection device for crane pipes. This device abandons the traditional method of manually hanging a liquid collection bucket and instead adopts a mechanical automatic driving liquid collection bucket design, thereby greatly improving the work efficiency and safety issues.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] An ultra-low-content ethylene glycol wastewater recovery device for an ethylene glycol device comprises a carbon dioxide analysis tower, a carbon dioxide analysis tower reboiler, a carbon dioxide analysis tower top air cooler, an ethylene glycol concentration tower top flash tank, a carbon dioxide venting KO tank, a carbon dioxide venting condensate pump, an ethylene glycol concentration tower top flash tank feed filter, and a carbon dioxide venting condensate ion exchange resin tank, characterized in that the top of the carbon dioxide analysis tower is connected to the carbon dioxide analysis tower top air cooler through a pipeline, a thermometer is arranged on the pipeline, the carbon dioxide analysis tower is connected to the carbon dioxide analysis tower reboiler through a pipeline, a flow meter b and a flow regulating valve b are arranged on the heat source pipeline on the left side of the carbon dioxide analysis tower reboiler, a carbon dioxide analysis tower vacuum ejector is connected to the carbon dioxide analysis tower through a pipeline, a flow meter a and a flow regulating valve a are arranged on the pipeline connecting the carbon dioxide analysis tower vacuum ejector and the carbon dioxide analysis tower, the carbon dioxide analysis tower is connected to the carbon dioxide analysis tower top air cooler through a pipeline, and a thermometer is arranged on the pipeline connecting the carbon dioxide analysis tower and the carbon dioxide analysis tower top air cooler. The air cooler at the top of the carbon dioxide analysis tower is connected to the carbon dioxide venting KO tank, the top of the carbon dioxide venting KO tank is connected to the RTO combustion system through a pipeline, a pressure gauge b is arranged on the carbon dioxide venting KO tank, the carbon dioxide analysis tower is connected to the carbon dioxide venting condensate pump through a pipeline, a carbon dioxide analysis tower filler is arranged in the carbon dioxide analysis tower, a liquid level control valve a is arranged on the pipeline connecting the carbon dioxide analysis tower and the carbon dioxide venting condensate pump, a liquid level gauge a is arranged on the carbon dioxide analysis tower, a pressure control valve is arranged on the pipeline connecting the carbon dioxide venting KO tank and the RTO combustion system, a liquid level gauge b and a liquid level control valve b are arranged on the pipeline connecting the upper part of the carbon dioxide venting condensate ion exchange resin tank to the carbon dioxide venting condensate pump, a liquid level gauge b and a liquid level control valve b are arranged on the pipeline connecting the lower part of the carbon dioxide venting condensate ion exchange resin tank to the top flash tank of the ethylene glycol concentration tower, an online conductivity analyzer and a feed filter for the flash tank at the top of the ethylene glycol concentration tower are arranged on the connecting line, a return water pipeline is extended from the part connecting the online conductivity analyzer and the feed filter for the flash tank at the top of the ethylene glycol concentration tower, and a gate valve is arranged on the return water pipeline.

[0008] Preferably, the carbon dioxide analysis tower is in a vacuum state, and the vacuum ejector of the carbon dioxide analysis tower adjusts the steam addition through the flow control valve a to accurately control the middle pressure.

[0009] Preferably, the upper part of the carbon dioxide venting condensate ion exchange resin tank is connected to the carbon dioxide venting condensate pump, and the lower part of the carbon dioxide venting condensate ion exchange resin tank is connected to the flash tank at the top of the ethylene glycol concentration tower. The ethylene glycol content in the wastewater is mainly reduced by the uninterrupted operation of the carbon dioxide venting condensate ion exchange resin tank, so that the wastewater meets the qualified standards.

[0010] Preferably, the carbon dioxide decomposition tower is connected to the carbon dioxide decomposition tower vacuum ejector through a pipeline, and a flow meter b and a flow regulating valve a are provided on the connected pipeline, which uses 1.2Mpa steam to provide a heat source;

[0011] Preferably, the carbon dioxide venting condensate ion exchange resin tank is connected to the TOC online instrument through a pipeline, one path is controlled by a gate valve to go to the wastewater system, and the other path enters the ethylene glycol concentration tower top flash tank through the ethylene glycol concentration tower top flash tank feed filter to be reused in the system.

[0012] Preferably, in order to reduce the operating cost of the device, reduce the use of clean condensate, stabilize product quality, reduce the amount of wastewater generated, and reduce corrosion when the equipment operates stably for a long period of time, a TOC online instrument must be installed after the carbon dioxide venting condensate ion exchange resin tank is emptied.

[0013] Preferably, in order to have a compact structure, convenient installation, easy cleaning, reduce cost investment, and increase the amount of wastewater recovery, the carbon dioxide analysis tower top air cooler must use an air cooler.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] The utility model of the device reduces the amount of wastewater discharged by recycling wastewater condensate through the carbon dioxide venting condensate ion exchange resin tank, and the upper part of the carbon dioxide venting condensate ion exchange resin tank is connected to the carbon dioxide venting condensate pump, mainly removing ethylene glycol through uninterrupted work, so that the ethylene glycol content in the wastewater meets the standard, reducing the use of clean condensate, reducing the amount of wastewater outsourcing treatment, reducing operating costs, and improving the economic benefits of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The utility model is a structural schematic diagram of an ultra-low content ethylene glycol wastewater recovery device for an ethylene glycol device.

[0017] In the figure: 1. flow meter a; 2. vacuum ejector of carbon dioxide analysis tower; 3. flow regulating valve a; 4. flow meter b; 5. flow regulating valve b; 6. reboiler of carbon dioxide analysis tower; 7. level meter a; 8. level control valve a; 9. carbon dioxide analysis tower; 10. packing of carbon dioxide analysis tower; 11. thermometer; 12. air cooler at the top of carbon dioxide analysis tower; 13. level meter b; 14. level control valve b; 15. carbon dioxide venting condensate pump; 16. carbon dioxide venting condensate ion exchange resin tank; 17. RTO combustion system; 18. feed filter of flash tank at the top of ethylene glycol concentration tower; 19. online conductivity analyzer; 20. flash tank at the top of ethylene glycol concentration tower; 21. gate valve; 22. carbon dioxide venting KO tank; 23. pressure gauge b; 24. pressure control valve. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] Example

[0020] In one embodiment, see Figure 1, an ultra-low-content ethylene glycol wastewater recovery equipment for an ethylene glycol device, comprising a carbon dioxide analysis tower 9, a carbon dioxide analysis tower reboiler 6, a carbon dioxide analysis tower top air cooler 12, an ethylene glycol concentration tower top flash tank 20, a carbon dioxide venting KO tank 22, a carbon dioxide venting condensate pump 15, an ethylene glycol concentration tower top flash tank feed filter 18, and a carbon dioxide venting condensate ion exchange resin tank 16, characterized in that the top of the carbon dioxide analysis tower 9 is connected to the carbon dioxide analysis tower top air cooler 12 through a pipeline, a thermometer 11 is provided on the pipeline, and the carbon dioxide analysis tower 9 is connected to the carbon dioxide analysis tower reboiler 6 through a pipeline A flow meter b4 and a flow regulating valve b5 are arranged on the heat source pipeline on the left side of the reboiler 6 of the carbon dioxide analysis tower. The vacuum ejector 2 of the carbon dioxide analysis tower is connected to the carbon dioxide analysis tower 9 through a pipeline. A flow meter a1 and a flow regulating valve a3 are arranged on the pipeline connecting the vacuum ejector 2 of the carbon dioxide analysis tower and the carbon dioxide analysis tower 9. The carbon dioxide analysis tower 9 is in a vacuum state. The vacuum ejector 2 of the carbon dioxide analysis tower adjusts the steam addition through the flow regulating valve a3 to accurately control the middle pressure. The carbon dioxide analysis tower 9 is connected to the top air cooler 12 of the carbon dioxide analysis tower through a pipeline. A thermometer 11 is provided on a pipeline connected to a carbon dioxide decomposition tower top air cooler 12, a carbon dioxide decomposition tower top air cooler 12 is connected to a carbon dioxide venting KO tank 22, a top of the carbon dioxide venting KO tank 22 is connected to an RTO combustion system 17 through a pipeline, a pressure gauge b23 is provided on the carbon dioxide venting KO tank 22, a carbon dioxide decomposition tower 9 is connected to a carbon dioxide venting condensate pump 15 through a pipeline, a carbon dioxide decomposition tower filler 10 is provided in the carbon dioxide decomposition tower 9, a liquid level control valve a8 is provided on the pipeline connecting the carbon dioxide decomposition tower 9 and the carbon dioxide venting condensate pump 15, a liquid level meter a7 is provided on the carbon dioxide decomposition tower 9, and a carbon dioxide decomposition tower 9 is connected to a carbon dioxide venting condensate pump 15. The pipeline connecting the empty KO tank 22 and the RTO combustion system 17 is provided with a pressure control valve 24, the pipeline connecting the upper part of the carbon dioxide venting condensate ion exchange resin tank 16 with the carbon dioxide venting condensate pump 15 is provided with a level meter b13 and a level control valve b14, the lower part of the carbon dioxide venting condensate ion exchange resin tank 16 is connected to the top flash tank 20 of the ethylene glycol concentration tower, and the pipeline is provided with an online conductivity analyzer 19 and a feed filter 18 for the flash tank at the top of the ethylene glycol concentration tower. A return water pipeline is extended from the part where the online conductivity analyzer 19 and the feed filter 18 for the flash tank at the top of the ethylene glycol concentration tower are connected, and a gate valve 21 is provided on the return water pipeline.

[0021] In one embodiment, see Figure 1, the carbon dioxide analysis tower 9, under the action of the carbon dioxide analysis tower reboiler 6 providing a heat source for it, the carbon dioxide analysis tower top air cooler 12 continuously cools the high-temperature gas containing ethylene glycol, carbon dioxide, etc., and passes through the ethylene glycol concentration tower top flash tank 20, the carbon dioxide venting KO tank 22, the carbon dioxide venting condensate pump 15, and the ethylene glycol concentration tower top flash tank feed filter 18 to filter mechanical impurities before entering the carbon dioxide venting condensate ion exchange resin tank 16 to work. The carbon dioxide analysis tower 9 maintains a certain negative pressure in the middle part under the action of the carbon dioxide analysis tower vacuum ejector 2, and provides 2.5Mpa steam as the heat source for the whole tower through the carbon dioxide analysis tower reboiler 6, ensuring that the gas containing carbon dioxide and ethylene glycol is continuously generated from the top. The gas that cannot be condensed after passing through the carbon dioxide analysis tower top air cooler 12 goes to the RTO combustion system 17 through the pressure control valve 24;

[0022] A small part of the condensate after condensation in the air cooler 12 at the top of the carbon dioxide analysis tower returns to the carbon dioxide analysis tower 9 and the liquid level is maintained by the liquid level control valve b14. Most of it is sent to the carbon dioxide venting condensate ion exchange resin tank 16 through the carbon dioxide venting condensate pump 15. After the carbon dioxide venting condensate ion exchange resin tank 16 works continuously, the TOC online instrument 19 is checked to see if it reaches the qualified level. After the resin is qualified, it is sent to the ethylene glycol concentration tower top flash tank 20 through the ethylene glycol concentration tower top flash tank feed filter 18. If the TOC online instrument 19 is unqualified, it is sent to the wastewater network through the gate valve 21 for external delivery.

[0023] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An ultra-low-content ethylene glycol wastewater recovery device for an ethylene glycol device, comprising a carbon dioxide analysis tower (9), a carbon dioxide analysis tower reboiler (6), a carbon dioxide analysis tower top air cooler (12), an ethylene glycol concentration tower top flash tank (20), a carbon dioxide venting KO tank (22), a carbon dioxide venting condensate pump (15), an ethylene glycol concentration tower top flash tank feed filter (18), and a carbon dioxide venting condensate ion exchange resin tank (16), characterized in that: The top of the carbon dioxide analysis tower (9) is connected to the carbon dioxide analysis tower top air cooler (12) through a pipeline, a thermometer (11) is provided on the pipeline, the carbon dioxide analysis tower (9) is connected to the carbon dioxide analysis tower reboiler (6) through a pipeline, a flow meter b (4) and a flow regulating valve b (5) are provided on the left heat source pipeline of the carbon dioxide analysis tower reboiler (6), the carbon dioxide analysis tower vacuum ejector (2) is connected to the carbon dioxide analysis tower (9) through a pipeline, and a pipeline connecting the carbon dioxide analysis tower vacuum ejector (2) and the carbon dioxide analysis tower (9) is provided. A flow meter a (1) and a flow regulating valve a (3) are arranged on the top of the carbon dioxide decomposition tower (9), the carbon dioxide decomposition tower (9) is connected to the carbon dioxide decomposition tower top air cooler (12) through a pipeline, a thermometer (11) is arranged on the pipeline connecting the carbon dioxide decomposition tower (9) and the carbon dioxide decomposition tower top air cooler (12), the carbon dioxide decomposition tower top air cooler (12) is connected to the carbon dioxide discharge KO tank (22), the top of the carbon dioxide discharge KO tank (22) is connected to the RTO combustion system (17) through a pipeline, and a pressure gauge is arranged on the carbon dioxide discharge KO tank (22). Table b (23), the carbon dioxide analysis tower (9) is connected to the carbon dioxide venting condensate pump (15) through a pipeline, a carbon dioxide analysis tower filler (10) is set in the carbon dioxide analysis tower (9), a liquid level control valve a (8) is set on the pipeline connecting the carbon dioxide analysis tower (9) and the carbon dioxide venting condensate pump (15), a liquid level gauge a (7) is set on the carbon dioxide analysis tower (9), a pressure control valve (24) is set on the pipeline connecting the carbon dioxide venting KO tank (22) and the RTO combustion system (17), and the carbon dioxide venting condensate ion exchange resin The upper part of the tank (16) is connected to the carbon dioxide venting condensate pump (15) through a pipeline provided with a liquid level meter b (13) and a liquid level control valve b (14); the lower part of the carbon dioxide venting condensate ion exchange resin tank (16) is connected to the flash tank (20) at the top of the ethylene glycol concentration tower through a pipeline provided with an online conductivity analyzer (19) and a feed filter (18) for the flash tank at the top of the ethylene glycol concentration tower; a return water pipeline is extended from the portion where the online conductivity analyzer (19) and the feed filter (18) for the flash tank at the top of the ethylene glycol concentration tower are connected, and a gate valve (21) is provided on the return water pipeline.

2. The ultra-low content ethylene glycol wastewater recovery equipment of an ethylene glycol device according to claim 1, characterized in that: The carbon dioxide analysis tower (9) is in a vacuum state, and the carbon dioxide analysis tower vacuum ejector (2) adjusts the steam addition through the flow control valve a (3) to accurately control the middle pressure.

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