Online wastewater treatment device for dilute acetic acid recovery system

Abstract

An online wastewater treatment device for a dilute acetic acid recovery system comprises a first wastewater pipeline connected with the dilute acetic acid recovery system, the first wastewater pipeline is communicated with a first sewage collecting tank, the online wastewater treatment device further comprises a second wastewater pipeline connected with a caprolactam recovery system, the second wastewater pipeline is communicated with a second sewage collecting tank, and the second sewage collecting tank is communicated with a third sewage collecting tank. The second wastewater pipeline is also communicated with a second wastewater branch pipe, and the other end of the second wastewater branch pipe is communicated with the accident water tank; the first wastewater pipeline is also communicated with a first wastewater branch pipe, and the other end of the first wastewater branch pipe is communicated with a second wastewater branch pipe. The online wastewater treatment system disclosed by the utility model can be used for directly conveying the wastewater exceeding the index in a dilute acetic acid recovery system to an accident water pool, and is timely and rapid to treat, so that the normal operation of an acetic anhydride system is ensured, and the use of a tank car is reduced. In conclusion, the wastewater treatment efficiency and reliability are improved, and the safety and practicability of the whole system are remarkably enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of wastewater treatment, and particularly relates to an on-line wastewater treatment device for a dilute acetic acid recovery system. Background Art

[0002] In the production process of acetic anhydride, especially in the cracking process and the vinyl ketone absorption process, a part of dilute acetic acid will be generated. After recovering acetic acid by extraction, the remaining wastewater needs to be treated.

[0003] At present, during the production process of the dilute acetic acid recovery system of the acetic anhydride workshop's acetic anhydride II device, 7 - 10 m3 / h of wastewater is generated, which needs to be sent to the sewage tank for recovery and treatment. When the system is adjusted, wastewater with COD, total phosphorus, and ammonia nitrogen contents higher than the standards cannot be directly sent to the sewage tank, and a tank truck needs to be used to send the high-standard wastewater to the accident water tank. This affects the normal operation of the acetic anhydride system and also increases the use of tank trucks. This is the deficiency of the existing technology. Summary of the Utility Model

[0004] The purpose of the utility model is to solve the problems raised in the above background art, and then a kind of on-line wastewater treatment device for a dilute acetic acid recovery system is proposed.

[0005] The technical solution adopted by the utility model to solve its technical problems is: an on-line wastewater treatment device for a dilute acetic acid recovery system, including a first wastewater pipe connected to the dilute acetic acid recovery system, the first wastewater pipe is communicated with a first sewage collection tank, and further includes a second wastewater pipe connected to the caprolactam recovery system, the second wastewater pipe is communicated with a second sewage collection tank, and a second wastewater branch pipe is also communicated on the second wastewater pipe, and the other end of the second wastewater branch pipe is communicated with the accident water tank; a first wastewater branch pipe is also communicated on the first wastewater pipe, and the other end of the first wastewater branch pipe is communicated with the second wastewater branch pipe.

[0006] A further improvement of the utility model is that a first sub-pipe and a second sub-pipe are arranged between the first wastewater pipe and the first sewage collection tank, a first valve is arranged on the first sub-pipe, and a second valve is arranged on the second sub-pipe.

[0007] A further improvement of the utility model is that a third valve is arranged on the second wastewater pipe.

[0008] A further improvement of the utility model is that a fourth valve is arranged on the first wastewater branch pipe.

[0009] A further improvement of the utility model is that a fifth valve is arranged on the second wastewater branch pipe.

[0010] A further improvement of the present utility model is that the first valve, the second valve, the third valve, the fourth valve and the fifth valve are all solenoid valves.

[0011] A further improvement of the present utility model is that the first valve, the second valve, the third valve, the fourth valve and the fifth valve are all electrically connected to a controller.

[0012] A further improvement of the present utility model is that the material of the first waste water branch pipe is 304 stainless steel or 316L stainless steel.

[0013] A further improvement of the present utility model is that a liquid level gauge is installed in the accident water tank, the liquid level gauge is electrically connected to the input end of the controller, and the output end of the controller is electrically connected to an alarm.

[0014] The beneficial effects of the present utility model are as follows: The waste water on-line treatment system of the present utility model can directly transport the waste water exceeding the index in the dilute acetic acid recovery system to the accident water tank, the treatment is timely and rapid, which ensures the normal operation of the acetic anhydride system, and at the same time reduces the use of tank trucks and the use of manpower. In short, the present utility model not only improves the efficiency and reliability of waste water treatment, but also significantly enhances the safety of the whole system, and has strong application and promotion value. Description of the Drawings

[0015] Figure 1 It is a structural schematic diagram of the specific embodiment of the present utility model;

[0016] In the figure, 1 is the first waste water pipeline, 2 is the first sewage collection tank, 3 is the second waste water pipeline, 31 is the third valve, 4 is the second sewage collection tank, 5 is the second waste water branch pipe, 51 is the fifth valve, 6 is the accident water tank, 7 is the first waste water branch pipe, 71 is the fourth valve, 8 is the first branch pipe, 81 is the first valve, 9 is the second branch pipe, and 91 is the second valve. Specific Embodiment

[0017] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model. The present utility model will be further described in conjunction with the drawings and embodiments:

[0018] Such as Figure 1As shown in the figure, an on-line wastewater treatment device for a dilute acetic acid recovery system includes a first wastewater pipe 1 connected to the dilute acetic acid recovery system. The first wastewater pipe 1 is communicated with a first sewage collection tank 2. It also includes a second wastewater pipe 3 connected to a caprolactam recovery system. The second wastewater pipe 3 is communicated with a second sewage collection tank 4. A second wastewater branch pipe 5 is also communicated with the second wastewater pipe 3. The other end of the second wastewater branch pipe 5 is communicated with an accident water tank 6.

[0019] The first wastewater pipe 1 ensures that the wastewater containing dilute acetic acid can be safely sent into the first sewage collection tank 2. The second wastewater pipe 3 ensures that the wastewater from the caprolactam recovery system is safely sent into the second sewage collection tank 4. The second wastewater branch pipe 5 can send the wastewater exceeding the index in the second wastewater pipe 3 into the accident water tank 6 to ensure that the accident wastewater will not have an adverse impact on the environment.

[0020] In addition, a first wastewater branch pipe 7 is also communicated with the first wastewater pipe 1. The other end of the first wastewater branch pipe 7 is communicated with the second wastewater branch pipe 5. When the wastewater index in the first wastewater pipe 1 is unqualified, the wastewater is directly sent into the accident water tank 6, which provides flexibility in wastewater treatment, enhances the reliability and stability of the whole system, and also reduces the use of tank trucks.

[0021] Furthermore, a first branch pipe 8 and a second branch pipe 9 are arranged between the first wastewater pipe 1 and the first sewage collection tank 2. A first valve 81 is arranged on the first branch pipe 8, and a second valve 91 is arranged on the second branch pipe 9. According to the actual production requirements, the opening and closing of the first valve 81 and the second valve 91 can be selected. It can be set to only open one valve, or both valves can be set to open simultaneously.

[0022] Furthermore, a third valve 31 is arranged on the second wastewater pipe 3. This valve is crucial for controlling the flow direction and flow rate of caprolactam wastewater. It can flexibly direct the wastewater to the second sewage collection tank 4 according to actual needs.

[0023] Furthermore, a fourth valve 71 is arranged on the first wastewater branch pipe 7. Its function is to cut off the wastewater flow to the second wastewater branch pipe 5 when necessary; when the wastewater index is qualified, this valve is in the closed state, and when the wastewater index is unqualified, this valve is in the open state.

[0024] Furthermore, a fifth valve 51 is arranged on the second wastewater branch pipe 5. This valve can quickly cut off or adjust the wastewater flowing to the accident water tank 6 to ensure that the wastewater is properly treated in case of emergency; when the wastewater index in the caprolactam system is qualified, this valve is in the closed state, and when the wastewater index in the caprolactam system is unqualified, this valve is in the open state.

[0025] Furthermore, the first valve 81, the second valve 91, the third valve 31, the fourth valve 71 and the fifth valve 51 are all solenoid valves. At the same time, the first valve 81, the second valve 91, the third valve 31, the fourth valve 71 and the fifth valve 51 are all electrically connected to the controller. Such an automated design greatly improves the efficiency and response speed of wastewater treatment and reduces human operation errors.

[0026] Furthermore, the material of the first wastewater branch pipe 7 is 304 stainless steel or 316L stainless steel. Both of these materials have good corrosion resistance and strength, ensuring the long-term stable operation of the wastewater treatment device.

[0027] Furthermore, a liquid level gauge is installed in the accident water tank 6. The liquid level gauge is electrically connected to the input end of the controller, and the output end of the controller is electrically connected to the alarm. The liquid level gauge installed in the accident water tank 6 can monitor the water level in real time and feed the data back to the controller. Once the water level is abnormal, the controller will immediately trigger the alarm, thus timely reminding the operator to take countermeasures and effectively preventing the occurrence of wastewater leakage accidents. Specifically, when the liquid level in the accident water tank 6 is too high and an alarm occurs, the acetic anhydride wastewater can be pumped into a tank truck for temporary storage and processed after it can be received; or the system can operate with a reduced capacity to reduce the amount of sewage sent out.

[0028] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of protection required by the present invention. The scope of protection required by the present invention is defined by the appended claims and their equivalents.

Claims

1. An online wastewater treatment device for a dilute acetic acid recovery system, comprising a first wastewater pipeline connected to the dilute acetic acid recovery system, wherein the first wastewater pipeline is connected to a first sewage collection tank, and characterized in that: It also includes a second wastewater pipe connected to the caprolactam recovery system, the second wastewater pipe is connected to a second sewage collection tank, the second wastewater pipe is also connected to a second wastewater branch pipe, the other end of the second wastewater branch pipe is connected to an accident water tank; the first wastewater pipe is also connected to a first wastewater branch pipe, the other end of the first wastewater branch pipe is connected to the second wastewater branch pipe.

2. The online wastewater treatment device for the dilute acetic acid recovery system according to claim 1, characterized in that: A first branch pipe and a second branch pipe are arranged between the first wastewater pipe and the first sewage collection tank. A first valve is arranged on the first branch pipe, and a second valve is arranged on the second branch pipe.

3. The online wastewater treatment device for the dilute acetic acid recovery system according to claim 2, characterized in that: The second wastewater pipe is provided with a third valve.

4. The online wastewater treatment device for the dilute acetic acid recovery system according to claim 3, characterized in that: The first wastewater branch pipe is provided with a fourth valve.

5. The online wastewater treatment device for the dilute acetic acid recovery system according to claim 4, characterized in that: The second wastewater branch pipe is provided with a fifth valve.

6. The online wastewater treatment device for the dilute acetic acid recovery system according to claim 5, characterized in that: The first valve, the second valve, the third valve, the fourth valve and the fifth valve are all solenoid valves.

7. The online wastewater treatment device for the dilute acetic acid recovery system according to claim 5, characterized in that: The first valve, the second valve, the third valve, the fourth valve and the fifth valve are all electrically connected to the controller.

8. The online wastewater treatment device for the dilute acetic acid recovery system according to claim 1, characterized in that: The material used for the first wastewater branch pipe is 304 stainless steel or 316L stainless steel.

9. The online wastewater treatment device for the dilute acetic acid recovery system according to claim 1, characterized in that: A liquid level meter is installed in the accident water pool, and the liquid level meter is electrically connected to the input end of the controller, and the output end of the controller is electrically connected to the alarm.

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