Anti-corrosion system of salt-containing wastewater transmission pipeline

Abstract

The utility model discloses an anti-corrosion system of a salt-containing wastewater transmission pipeline. The anti-corrosion system at least comprises a sewage pool; the water delivery pump is arranged on one side of the sewage pool; the salt-containing wastewater conveying pipeline is connected with the water conveying pump and the sewage pool; the clean water tank and the sewage tank are arranged in parallel; the flushing water conveying pipeline is connected with the clean water tank and one end, close to the water conveying pump, of the salt-containing wastewater conveying pipeline; and the backflow pipeline is connected with the clean water tank and one end, close to the sewage tank, of the salt-containing wastewater transmission pipeline. By means of the anti-corrosion system of the salt-containing waste water conveying pipeline, the corrosion degree of the salt-containing waste water conveying pipeline can be slowed down, and the economic benefits of operation of the conveying pipeline are improved.

Description

Technical Field

[0001] This utility model relates to the field of saline wastewater discharge technology, and specifically to an anti-corrosion system for saline wastewater transmission pipelines. Background Technology

[0002] In chemical plants, saline wastewater transmission pipelines are used to transport wastewater to sewage treatment ponds for centralized and harmless treatment. However, after the wastewater transportation process, saline media remain inside the pipelines, corroding them and frequently causing pitting corrosion and leakage on the outer walls, thus increasing maintenance costs. Therefore, there is an urgent need for an anti-corrosion system to solve the corrosion problem of saline wastewater transmission pipelines and improve the economic efficiency of their operation. Utility Model Content

[0003] The purpose of this invention is to provide an anti-corrosion system for saline wastewater transmission pipelines, which can slow down the corrosion of saline wastewater transmission pipelines and improve the economic efficiency of pipeline operation.

[0004] To achieve the above-mentioned and other related objectives, this utility model is implemented through the following technical solution.

[0005] This utility model provides a corrosion protection system for saline wastewater transmission pipelines, comprising at least:

[0006] Sewage tank;

[0007] A water pump is installed on one side of the sewage tank;

[0008] A saline wastewater transmission pipeline connects the water pump and the sewage tank;

[0009] A clear water tank is arranged in parallel with the sewage tank;

[0010] A flushing water transmission pipeline connects the clear water tank to the end of the saline wastewater transmission pipeline near the water pump; and

[0011] A return pipe connects the clear water tank to the end of the saline wastewater transmission pipe near the sewage tank.

[0012] In one embodiment of this utility model, the return pipe is connected to the flushing water transmission pipe.

[0013] In one embodiment of this utility model, the corrosion protection system further includes a bypass pipe, which is disposed on both sides of the connection point between the saline wastewater transmission pipe and the flushing water transmission pipe.

[0014] In one embodiment of the present invention, the corrosion prevention system further includes a detector, which is installed at one end of the saline wastewater pipe near the sewage tank.

[0015] In one embodiment of the present invention, the corrosion prevention system further includes at least one outlet valve, which is disposed at one end of the saline wastewater transmission pipeline near the water pump.

[0016] In one embodiment of this utility model, there are three outlet valves, including a first outlet valve, a second outlet valve, and a third outlet valve. The first outlet valve is located on the end of the saline wastewater transmission pipeline near the water pump. The second outlet valve is located on the side of the saline wastewater transmission pipeline away from the water pump from the first outlet valve. The third outlet valve is located on the side of the saline wastewater transmission pipeline away from the first outlet valve from the second outlet valve.

[0017] In one embodiment of the present invention, the corrosion protection system further includes a bypass pipe, one end of which is connected to the saline wastewater transmission pipe on the side of the third outlet valve away from the second outlet valve, and the other end is connected to the saline wastewater transmission pipe between the first outlet valve and the second outlet valve.

[0018] In one embodiment of the present invention, the corrosion prevention system further includes at least one discharge valve, which is disposed at one end of the saline wastewater transmission pipeline near the sewage tank.

[0019] In one embodiment of this utility model, the saline wastewater transmission pipeline and the return pipeline are connected in parallel and then connected to the discharge valve.

[0020] In one embodiment of the present invention, the corrosion protection system further includes at least one switching valve, which is disposed on the flushing water transmission pipeline.

[0021] In one embodiment of the present invention, the corrosion protection system further includes a circulation control valve, which is disposed on the return pipe.

[0022] In summary, this invention proposes an anti-corrosion system for saline wastewater transmission pipelines. By arranging a flushing water transmission pipeline around the saline wastewater transmission pipeline, flushing water is delivered into the pipeline to remove residual salts, thus slowing down corrosion, reducing maintenance costs, and improving the economic efficiency of pipeline operation. Furthermore, the flushing water in this anti-corrosion system can be recycled between the clear water tank and the saline wastewater transmission pipeline, further reducing anti-corrosion costs and making it suitable for large-scale application.

[0023] Of course, implementing any of the methods of this utility model does not necessarily require achieving all of the advantages described above at the same time. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the corrosion protection system for a saline wastewater transmission pipeline in one embodiment of the present invention.

[0026] Marker explanation:

[0027] 11. Water pump; 12. Sewage tank; 13. Saline wastewater transmission pipeline; 14. Clear water tank; 15. Flushing water transmission pipeline; 16. Return pipeline; 17. Bypass pipeline; 18. Detector; 19. Outlet valve; 191. First outlet valve; 192. Second outlet valve; 193. Third outlet valve; 20. Discharge valve; 21. On / off valve; 22. Circulation control valve; 23. Isolation valve; 24. Bypass valve; 25. Booster pump. Detailed Implementation

[0028] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this utility model can be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0029] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0030] In this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" are used only for descriptive and distinguishing purposes and should not be construed as indicating or implying relative importance.

[0031] Please see Figure 1 As shown, this utility model provides a corrosion-resistant system for a saline wastewater transmission pipeline, including, for example, a water pump 11, a sewage tank 12, a saline wastewater transmission pipeline 13, a clear water tank 14, a flushing water transmission pipeline 15, and a return pipeline 16. The water pump 11 is located on one side of the sewage tank 12. The saline wastewater transmission pipeline 13 connects the water pump 11 and the sewage tank 12. The clear water tank 14 is arranged parallel to the sewage tank 12. The flushing water transmission pipeline 15 connects the clear water tank 14 and the end of the saline wastewater transmission pipeline 13 closest to the water pump 11. The return pipeline 16 connects the clear water tank 14 and the end of the saline wastewater transmission pipeline 13 closest to the sewage tank 12. In the anti-corrosion system for saline wastewater transmission pipelines provided by this utility model, after the saline wastewater transmission pipeline 13 transports saline wastewater to the sewage tank 12, flushing water is transported into the saline wastewater transmission pipeline 13 through the flushing water transmission pipeline 15 to flush away the residual salt substances in the saline wastewater transmission pipeline 13, thereby slowing down the corrosion of the saline wastewater transmission pipeline 13 by the salt substances, reducing the maintenance cost of the saline wastewater transmission pipeline 13, and improving the economic efficiency of the operation of the saline wastewater transmission pipeline 13.

[0032] Please see Figure 1 As shown, in one embodiment of this utility model, the sewage tank 12 centrally treats saline wastewater to prevent it from being directly discharged into the external environment, thereby achieving the purpose of protecting the environment.

[0033] Please see Figure 1 As shown, in one embodiment of this utility model, a water pump 11 is installed on one side of the sewage tank 12 to pressurize the saline wastewater so that the saline wastewater can flow smoothly through the subsequently installed sewage tank 12. The water pump 11 can be, for example, a centrifugal pump, a diaphragm pump, or a plunger pump.

[0034] Please see Figure 1As shown, in one embodiment of this utility model, a saline wastewater transmission pipeline 13 connects a water pump 11 and a sewage tank 12 to transfer saline wastewater from the outlet of the water pump 11 to the sewage tank 12. The saline wastewater transmission pipeline 13 is equipped with, for example, an outlet valve 19 and a discharge valve 20, which are spaced apart. Specifically, the outlet valve 19 is located, for example, at the end of the saline wastewater transmission pipeline 13 near the water pump 11 to control the flow of saline wastewater from the outlet of the water pump 11 within the saline wastewater transmission pipeline 13, and there is, for example, at least one outlet valve 19. In this embodiment, there are, for example, three outlet valves 19. These three outlet valves 19 are, for example, a first outlet valve 191, a second outlet valve 192, and a third outlet valve 193. The first outlet valve 191 is, for example, located on the end of the saline wastewater transmission pipeline 13 closest to the water pump 11. The second outlet valve 192 is, for example, located on the side of the saline wastewater transmission pipeline 13 furthest from the water pump 11 from the first outlet valve 191. The third outlet valve 193 is, for example, located on the side of the saline wastewater transmission pipeline 13 furthest from the first outlet valve 191 from the second outlet valve 192. If only one outlet valve 19 is provided, the flow of saline wastewater in the saline wastewater transmission pipeline 13 cannot be controlled when that single outlet valve 19 fails. Therefore, in this application, by providing three outlet valves 19, when one outlet valve 19 fails, the flow of saline wastewater in the saline wastewater transmission pipeline 13 can be controlled through the other outlet valves 19, thereby improving the flexibility of control.

[0035] Please see Figure 1 As shown, in one embodiment of this utility model, a discharge valve 20 is, for example, installed at one end of the saline wastewater transmission pipeline 13 near the sewage tank 12, and there is at least one discharge valve 20. In this embodiment, there is, for example, one discharge valve 20. By opening the discharge valve 20, the saline wastewater in the saline wastewater transmission pipeline 13 can be discharged into the sewage tank 12 for centralized harmless treatment. However, after the discharge, salt substances will still remain in the saline wastewater transmission pipeline 13. These salt substances will remain stationary in the saline wastewater transmission pipeline 13 and corrode it, causing pitting corrosion and leakage on the outer wall of the saline wastewater transmission pipeline 13, increasing the maintenance cost of the saline wastewater transmission pipeline 13. Therefore, after the saline wastewater in the saline wastewater transmission pipeline 13 is transmitted to the sewage tank 12, the inner wall of the saline wastewater transmission pipeline 13 must be flushed to wash away the residual salt substances and slow down the corrosion of the saline wastewater transmission pipeline 13.

[0036] Please see Figure 1As shown, in one embodiment of this utility model, a clear water tank 14 and a sewage tank 12 are arranged side by side to store flushing water, which is used as a water source to flush the inner wall of the saline wastewater transmission pipe 13. This application does not specify the water quality requirements for the flushing water in the clear water tank 14; it can be tap water, deionized water, or rainwater recovery water, which can be selected according to actual needs. Furthermore, in other embodiments, in addition to the flushing water, a corrosion inhibitor is added to the clear water tank 14. The corrosion inhibitor is flushed along with the flushing water to wash the inner wall of the saline wastewater transmission pipe 13, thereby improving the anti-corrosion effect of the saline wastewater transmission pipe 13.

[0037] Please see Figure 1 As shown, in one embodiment of this utility model, the flushing water transmission pipe 15 connects the end of the clear water tank 14 and the saline wastewater transmission pipe 13 near the water pump 11, so as to transport the flushing water in the clear water tank 14 to the saline wastewater transmission pipe 13. After flushing away the residual salt substances in the saline wastewater transmission pipe 13, the salt substances and flushing water flow out of the saline wastewater transmission pipe 13 together and are discharged into the sewage tank 12, thereby reducing the corrosion of the saline wastewater transmission pipe 13 by the salt substances. Specifically, the connection point A between the flushing water transmission pipe 15 and the saline wastewater transmission pipe 13 is located between the second outlet valve 192 and the third outlet valve 193.

[0038] Please see Figure 1 As shown, in one embodiment of this utility model, a switch valve 21 is provided on the flushing water transmission pipe 15. The switch valve 21 may be at least one. In this embodiment, there is one switch valve 21. By providing the switch valve 21, the flow of flushing water in the flushing water transmission pipe 15 can be controlled. Specifically, when the saline wastewater in the saline wastewater transmission pipe 13 is transmitted to the sewage tank 12, the switch valve 21 can be opened to send the flushing water in the clear water tank 14 into the saline wastewater transmission pipe 13 through the flushing water transmission pipe 15 to flush the inner wall of the saline wastewater transmission pipe 13.

[0039] Please see Figure 1 As shown, in one embodiment of this utility model, a booster pump 25 is installed between the flushing water transmission pipeline 15 and the clear water tank 14 to pressurize the flushing water in the clear water tank 14, enabling the flushing water to be smoothly transported to the saline wastewater transmission pipeline 13. Furthermore, by installing the booster pump 25, the pressure of the flushing water entering the saline wastewater transmission pipeline 13 can be increased, intensifying the flushing effect of the flushing water on the residual salts in the saline wastewater transmission pipeline 13, thereby improving the corrosion resistance of the saline wastewater transmission pipeline 13. The booster pump 25 can be, for example, a centrifugal pump, a diaphragm pump, or a plunger pump.

[0040] Please see Figure 1As shown, in one embodiment of this utility model, the anti-corrosion system further includes a bypass pipe 17. One end of the bypass pipe 17 is connected to the saline wastewater transmission pipe 13 on the side of the third outlet valve 193 away from the second outlet valve 192, and the other end is connected to the saline wastewater transmission pipe 13 between the first outlet valve 191 and the second outlet valve 192. By setting the bypass pipe 17 as a backup, when the saline wastewater transmission pipe 13 between the second outlet valve 192 and the third outlet valve 193 fails and cannot transmit saline wastewater, the saline wastewater at the outlet of the water pump 11 can still be discharged into the sewage tank 12 through the first outlet valve 191, the bypass pipe 17, and the discharge valve 20, thereby improving the reliability of the transmission of saline wastewater between the water pump 11 and the sewage tank 12.

[0041] Please see Figure 1 As shown, in one embodiment of this utility model, a bypass valve 24 is provided on the bypass pipe 17 to control the flow of saline wastewater in the bypass pipe 17. By controlling the opening and closing of the bypass valve 24, the spare bypass pipe 17 can be put into use at any time to improve the stability of the transmission of saline wastewater between the water pump 11 and the sewage tank 12.

[0042] Please see Figure 1 As shown, in one embodiment of this utility model, the return pipe 16 connects the clear water tank 14 and the end of the saline wastewater transmission pipe 13 near the sewage tank 12. Specifically, in this embodiment, the return pipe 16 and the saline wastewater transmission pipe 13 are connected in parallel and then connected to the discharge valve 20. As the flushing water flushes the saline wastewater transmission pipe 13, the concentration of salts in the flushing water at the outlet of the saline wastewater transmission pipe 13 gradually decreases. If the flushing water with a relatively low salt concentration continues to be discharged into the sewage tank 12, it will result in waste of flushing water. Therefore, in this application, by setting up the return pipe 16, the flushing water with a relatively low salt concentration is sent back to the clear water tank 14, and the flushing water is circulated in the clear water tank 14, the saline wastewater transmission pipe 13, and the return pipe 16, thereby reducing corrosion prevention costs and avoiding waste.

[0043] Please see Figure 1 As shown, in one embodiment of this utility model, a circulation control valve 22 is provided on the return pipe 16 to control whether the flushing water at the outlet of the saline wastewater transmission pipe 13 flows into the clear water pool 14.

[0044] Please see Figure 1As shown, in one embodiment of this utility model, a detector 18 is installed at one end of the saline wastewater transmission pipeline 13 near the sewage tank 12 to determine the salt content in the flushing water at the outlet of the saline wastewater transmission pipeline 13 when flushing water is used to flush the saline wastewater transmission pipeline 13. Specifically, the detector 18 is located on the saline wastewater transmission pipeline 13 between the discharge valve 20 and the sewage tank 12. Taking a pH detector as an example, the working process of the return pipeline 16 is explained. When the detector 18 detects that the pH of the flushing water at the outlet of the saline wastewater transmission pipeline 13 is at a preset value, it indicates that the salt concentration in the flushing water is relatively low. Therefore, the circulation control valve 22 can be opened and the discharge valve 20 can be closed, allowing the flushing water at the outlet of the saline wastewater transmission pipeline 13 to be led to the clear water tank 14 through the return pipeline 16. The flushing water thus circulates in the clear water tank 14, the saline wastewater transmission pipeline 13, and the return pipeline 16 to avoid waste of flushing water. The preset value is, for example, 6-9.

[0045] Please see Figure 1 As shown, in one embodiment of this utility model, the return pipe 16 is connected to the flushing water transmission pipe 15. Specifically, the return pipe 16 at the end of the circulation control valve 22 away from the clear water tank 14 is connected to the flushing water transmission pipe 15 at the end of the switch valve 21 away from the clear water tank 14. If the flushing water in the flushing water transmission pipe 15 can only be sent to the end of the saline wastewater transmission pipe 13 near the water pump 11, during the flow of the flushing water from the saline wastewater transmission pipe 13 into the sewage tank 12, the pressure decreases as the flushing water reaches the end of the saline wastewater transmission pipe 13 near the sewage tank 12 due to pressure loss, resulting in incomplete flushing of residual salts in the saline wastewater transmission pipe 13. In this application, by connecting the return pipe 16 to the flushing water transmission pipe 15, the high-pressure flushing water in the flushing water transmission pipe 15 can not only be sent to the end of the saline wastewater transmission pipe 13 near the water pump 11, but also directly sent to the end of the saline wastewater transmission pipe 13 near the sewage tank 12 through the return pipe 16, thereby amplifying the flushing effect of the flushing water on the end of the saline wastewater transmission pipe 13 near the sewage tank 12 and improving the anti-corrosion effect on the saline wastewater transmission pipe 13.

[0046] Please see Figure 1 As shown, in one embodiment of this utility model, an isolation valve 23 is provided on the connecting pipe between the return pipe 16 and the flushing water transmission pipe 15 to control the flow of flushing water from the flushing water transmission pipe 15 to the return pipe 16.

[0047] To further illustrate the corrosion protection system for saline wastewater transmission pipelines provided by this utility model, the working process of the corrosion protection system is described in detail below.

[0048] Please see Figure 1As shown, open the first outlet valve 191, the second outlet valve 192, the third outlet valve 193 and the discharge valve 20, and start the water pump 11 to transport the saline wastewater to the sewage tank 12.

[0049] Please see Figure 1 As shown, after the saline wastewater is transported, the water pump 11 is stopped, the first outlet valve 191, the second outlet valve 192, the third outlet valve 193 and the discharge valve 20 are closed, and the switch valve 21, the second outlet valve 192, the bypass valve 24 and the isolation valve 23 are opened. At the same time, the discharge valve 20 is opened to 10%, and the booster pump 25 is started. The flushing water in the clear water tank 14 is divided into two paths. One path flows through the switch valve 21, the second outlet valve 192, the bypass valve 24 and the discharge valve 20 and flows into the sewage tank 12. The other path flows through the switch valve 21, the isolation valve 23 and the discharge valve 20 and flows into the sewage tank 12 to perform the first flushing of the bypass pipe 17 and part of the saline wastewater transmission pipe 13.

[0050] Please see Figure 1 As shown, during the first flushing process, the flushing water does not flow through the saline wastewater transmission pipeline 13 before and after the third outlet valve 193. Therefore, after the first flushing has been performed for a preset time, the third outlet valve 193 is opened, and the second outlet valve 192 and the bypass valve 24 are closed, so that the flushing water from the outlet of the switch valve 21 flows through the third outlet valve 193 and the discharge valve 20 into the sewage tank 12, so as to focus on flushing the saline wastewater transmission pipeline 13 before and after the third outlet valve 193.

[0051] Please see Figure 1 As shown, during the rinsing process, the detector 18 continuously monitors the pH of the rinsing water at the outlet of the saline wastewater transmission pipeline 13. Once the detector 18 detects that the pH of the rinsing water has reached the preset value, it opens the circulation control valve 22 and closes the discharge valve 20, allowing the rinsing water in the saline wastewater transmission pipeline 13 to flow into the clear water tank 14.

[0052] In summary, this invention proposes an anti-corrosion system for saline wastewater transmission pipelines. By arranging a flushing water transmission pipeline around the saline wastewater transmission pipeline, flushing water is delivered into the pipeline to remove residual salts, thus slowing down corrosion, reducing maintenance costs, and improving the economic efficiency of pipeline operation. Furthermore, the flushing water in this anti-corrosion system can be recycled between the clear water tank and the saline wastewater transmission pipeline, further reducing anti-corrosion costs and making it suitable for large-scale application.

[0053] Throughout this specification, the terms "one embodiment," "an embodiment," or "a specific embodiment" refer to a particular feature, structure, or characteristic described in connection with an embodiment, which is included in at least one embodiment of the present invention, but not necessarily in all embodiments. Therefore, the various representations of the phrases "in one embodiment," "in an embodiment," or "in a specific embodiment" in different places throughout the specification do not necessarily refer to the same embodiment. Furthermore, a particular feature, structure, or characteristic of any specific embodiment of the present invention may be combined with one or more other embodiments in any suitable manner. It should be understood that other variations and modifications of the embodiments of the present invention described and illustrated herein may be based on the teachings herein and will be considered part of the spirit and scope of the present invention.

[0054] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the utility model involved in this application is not limited to the technical solutions formed by specific combinations of the above-described technical features. It should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features with similar functions disclosed in this application. Except for the technical features described in the specification, the remaining technical features are known to those skilled in the art. To highlight the innovative features of this utility model, the remaining technical features will not be described further here.

Claims

1. A corrosion protection system for a saline wastewater transmission pipeline, characterized in that, At least including: Sewage tank; A water pump is installed on one side of the sewage tank; A saline wastewater transmission pipeline connects the water pump and the sewage tank; A clear water tank is arranged in parallel with the sewage tank; A flushing water transmission pipeline connects the clear water tank to the end of the saline wastewater transmission pipeline near the water pump; and A return pipe connects the clear water tank to the end of the saline wastewater transmission pipe near the sewage tank.

2. The anti-corrosion system according to claim 1, characterized in that, The return pipe is connected to the flushing water transmission pipe.

3. The anti-corrosion system according to claim 1, characterized in that, The corrosion prevention system also includes a detector, which is installed at one end of the saline wastewater transmission pipeline near the sewage tank.

4. The anti-corrosion system according to claim 1, characterized in that, The corrosion protection system also includes at least one outlet valve, which is located at one end of the saline wastewater transmission pipeline near the water pump.

5. The anti-corrosion system according to claim 4, characterized in that, There are three outlet valves, including a first outlet valve, a second outlet valve, and a third outlet valve. The first outlet valve is located on the end of the saline wastewater transmission pipeline near the water pump. The second outlet valve is located on the side of the saline wastewater transmission pipeline away from the water pump, and the third outlet valve is located on the side of the saline wastewater transmission pipeline away from the first outlet valve.

6. The anti-corrosion system according to claim 5, characterized in that, The corrosion protection system also includes a bypass pipeline, one end of which is connected to the saline wastewater transmission pipeline on the side of the third outlet valve away from the second outlet valve, and the other end is connected to the saline wastewater transmission pipeline between the first outlet valve and the second outlet valve.

7. The anti-corrosion system according to claim 1, characterized in that, The corrosion protection system also includes at least one discharge valve, which is located at one end of the saline wastewater transmission pipeline near the sewage tank.

8. The anti-corrosion system according to claim 7, characterized in that, The saline wastewater transmission pipeline and the return pipeline are connected in parallel, and then connected to the discharge valve.

9. The anti-corrosion system according to claim 1, characterized in that, The corrosion protection system also includes at least one on / off valve, which is disposed on the flushing water transmission pipeline.

10. The anti-corrosion system according to claim 1, characterized in that, The corrosion protection system also includes a circulation control valve, which is installed on the return pipe.

Images