Sedimentation filtration backwash device

Abstract

The utility model provides a sedimentation filtration backwashing device, comprising: a sedimentation part, the two opposite sides of the sedimentation part are respectively an inlet side and an outlet side, the inlet side of the sedimentation part is connected to a sedimentation inlet pipeline, the sedimentation inlet pipeline is used to input liquid into the sedimentation part, a plurality of sedimentation tanks are arranged in sequence from the inlet side to the outlet side in the sedimentation part, and the outlet side of the sedimentation part is connected to a cryogenic liquid pump; a backwashing part is connected to the outlet side of the sedimentation part, and the backwashing part is used to input a backwashing gas source into the sedimentation part; a sewage discharge part is connected to the bottom of the sedimentation tank to discharge impurities in the sedimentation part; a pressure difference detection part is connected to both the inlet side and the outlet side of the sedimentation part to detect the pressure difference between the inlet side and the outlet side of the sedimentation part. With this scheme, cleaning the impurities after filtration is simple and time-saving, and the steps of powering off the cryogenic liquid pump, draining, removing cold-keeping pearl sand, backfilling cold-keeping pearl sand, power transmission, and re-precooling are omitted, which is easy to control risks.

Description

Technical Field

[0001] The utility model relates to the technical field of coal chemical equipment, in particular to a sedimentation filtration backwashing device. Background Art

[0002] The cryogenic liquid pump is a key equipment for coal chemical air separation projects to ensure the system supply of high-pressure oxygen, high-pressure nitrogen and other products. At present, in the air separation purification system of the air separation unit, the molecular sieve used to adsorb moisture, hydrocarbons, and carbon dioxide in the air will be broken during the molecular sieve pressure swing adsorption process. The broken molecular sieve is carried by the outlet airflow of the purifier to the inlet pipeline of the cryogenic liquid pump of the distillation system section, resulting in the clogging of the inlet filter of the cryogenic liquid pump, which reduces the inlet suction pressure of the cryogenic pump, causes cavitation of the cryogenic liquid pump, and greatly fluctuates the outlet pressure and flow of the cryogenic liquid pump. The heat on the high-pressure side of the plate heat exchanger is unbalanced, and even causes the air separation unit to stop, the air separation high-pressure oxygen and high-pressure nitrogen product pipelines to be unstable, and the system load is reduced. Therefore, the device needs to be improved to ensure the safe, stable and long-term operation of the cryogenic liquid pump.

[0003] The general technology for filtering impurities at the inlet of the cryogenic liquid pump of the existing air separation unit is mainly to set a Y-shaped metal filter through the inlet pipeline of the cryogenic pump to filter the cryogenic liquid from the distillation tower. The cryogenic liquid with impurities removed by filtration enters the cryogenic pump, and then is sent to the plate heat exchanger for reheating and gasification after being pressurized by the cryogenic liquid pump, and then sent to the product pipeline. However, after the Y-shaped metal filter at the inlet of the cryogenic liquid pump is blocked by impurities, it is necessary to cut off the power supply of the metal filter and the cryogenic liquid pump, cut off the valve, and remove the cryogenic liquid. A series of process handover steps, and the metal filter can only be removed for cleaning after manually removing the cold-keeping pearl sand in the compartment of the cryogenic liquid pump. Before and after cleaning, multiple departments such as electrical, instrumentation, process, equipment, and maintenance need to cooperate to complete the cleaning of the filter. After the metal filter is cleaned, it is necessary to manually reset the filter and filter, and backfill the compartment pearl sand. Finally, the cryogenic liquid pump is pre-cooled again, the power supply and valve status are restored, and it is started for standby after acceptance. The entire cleaning and maintenance process is long and time-consuming, and there is a long vacuum period in the emergency standby state of the cryogenic liquid pump. Utility Model Content

[0004] The utility model provides a sedimentation filtration backwashing device to solve the problems of long cleaning and maintenance time and complicated operation of the device for filtering a low-temperature liquid pump in the prior art after being blocked.

[0005] In order to solve the above problems, the utility model provides a sedimentation filtration backwashing device, comprising: a sedimentation part, wherein the two opposite sides of the sedimentation part are respectively an inlet side and an outlet side, the inlet side of the sedimentation part is connected to a sedimentation inlet pipeline, the sedimentation inlet pipeline is used to input liquid into the sedimentation part, and the sedimentation part has a plurality of sedimentation tanks arranged in sequence from the inlet side to the outlet side, and the outlet side of the sedimentation part is connected to a low-temperature liquid pump; a backwashing part, connected to the outlet side of the sedimentation part, the backwashing part is used to input a backwashing gas source into the sedimentation part; a sewage discharge part, connected to the bottom of the sedimentation tank to discharge impurities in the sedimentation part; a pressure difference detection part, connected to both the inlet side and the outlet side of the sedimentation part to detect the pressure difference between the inlet side and the outlet side of the sedimentation part.

[0006] Furthermore, the backwashing section includes a backwashing air inlet pipe, a backwashing nitrogen pipe and a backwashing heating air pipe, the backwashing air inlet pipe is connected to the outlet side of the settling section, and the backwashing nitrogen pipe and the backwashing heating air pipe are respectively connected to the backwashing air inlet pipe.

[0007] Furthermore, the backwashing part also includes a backwash nitrogen valve and a backwash heating gas valve, the backwash nitrogen valve is arranged on the backwash nitrogen pipe, and the backwash heating gas valve is arranged on the backwash heating gas pipe.

[0008] Furthermore, the sedimentation part includes an outer shell and a primary sedimentation tank, a primary baffle, an intermediate baffle, a secondary sedimentation tank and a secondary baffle which are sequentially arranged in the outer shell from the inlet side to the outlet side, and the primary sedimentation tank and the secondary sedimentation tank are both connected to the sewage discharge part.

[0009] Furthermore, the sewage discharge part includes a sewage pipe, a first sewage branch pipe and a second sewage branch pipe, the first-level sedimentation tank is connected to the sewage pipe through the first sewage branch pipe, the second-level sedimentation tank is connected to the sewage pipe through the second sewage branch pipe, the first sewage branch pipe is provided with a first sewage valve, and the second sewage branch pipe is provided with a second sewage valve.

[0010] Furthermore, the differential pressure detection unit includes a pressure taking tube and a differential pressure sensor, both ends of the pressure taking tube are respectively connected to the inlet side and the outlet side of the settling unit, and the differential pressure sensor is arranged on the pressure taking tube.

[0011] Furthermore, the sedimentation filtration backwashing device also includes a safety discharge exhaust pipe, which is connected to the top of the sedimentation part, and is provided with an exhaust valve and a safety valve.

[0012] Furthermore, the sedimentation filtration backwashing device also includes a return air pipeline, the return air pipeline is connected to the top of the sedimentation part, and a return air valve is arranged on the return air pipeline.

[0013] Furthermore, the sedimentation filtration backwashing device also includes a sedimentation outlet pipeline and a Y-type metal filter, the outlet side of the sedimentation part is connected through the sedimentation outlet pipeline and the Y-type metal filter, the sedimentation outlet pipeline is provided with an outlet stop valve, and the sedimentation inlet pipeline is provided with an inlet stop valve.

[0014] Furthermore, the Y-type metal filter is connected to a low-temperature inlet pipeline through a low-temperature inlet valve, the low-temperature inlet pipeline is connected to the low-temperature liquid pump, the low-temperature liquid pump is connected to a low-temperature outlet pipeline, and the low-temperature outlet pipeline is connected to a delivery pipeline through a low-temperature outlet valve.

[0015] The technical scheme of the utility model is applied to provide a sedimentation filtration backwashing device, including: a sedimentation part, the two opposite sides of the sedimentation part are the inlet side and the outlet side respectively, the inlet side of the sedimentation part is connected to the sedimentation inlet pipeline, the sedimentation inlet pipeline is used to input liquid into the sedimentation part, the sedimentation part has a plurality of sedimentation tanks arranged in sequence from the inlet side to the outlet side, and the outlet side of the sedimentation part is connected to a cryogenic liquid pump; a backwashing part is connected to the outlet side of the sedimentation part, and the backwashing part is used to input a backwashing gas source into the sedimentation part; a sewage discharge part is connected to the bottom of the sedimentation tank to discharge impurities in the sedimentation part; a pressure difference detection part is connected to both the inlet side and the outlet side of the sedimentation part to detect the pressure difference between the inlet side and the outlet side of the sedimentation part. In this scheme, the impurities in the input liquid are precipitated by the sedimentation tank in the sedimentation part, so as to realize filtering. When there are many impurities in the sedimentation tank, which affect the fluid pressure entering the cryogenic liquid pump, the impurities are discharged by the sewage discharge part, and the sedimentation part is flushed by blowing air into the sedimentation part by the backwashing part to avoid blockage caused by accumulation of impurities. By adopting this solution, cleaning the impurities after filtration is simple and time-saving, and it eliminates the steps of shutting down the low-temperature liquid pump, draining the liquid, removing the cold-keeping pearlescent sand, backfilling the cold-keeping pearlescent sand, supplying power, and re-precooling. There are fewer operation processes and it is easier to control risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0017] Figure 1 The schematic diagram of the structure of the sedimentation filtration backwashing device provided in the embodiment of the utility model is shown.

[0018] The above drawings include the following reference numerals:

[0019] 1. Sedimentation inlet pipeline;

[0020] 2. Inlet stop valve;

[0021] 4. Sedimentation outlet pipeline;

[0022] 5. Outlet stop valve;

[0023] 6. Y-type metal filter;

[0024] 7. Low temperature inlet valve;

[0025] 8. Low temperature import pipeline;

[0026] 9. Cryogenic liquid pump;

[0027] 10. Low temperature export pipeline;

[0028] 11. Low temperature outlet valve;

[0029] 12. Delivery pipeline;

[0030] 31. Primary sedimentation tank;

[0031] 32. Primary baffle;

[0032] 33. Intermediate baffle;

[0033] 34. Secondary sedimentation tank;

[0034] 35. Secondary baffle;

[0035] 36. Air return valve;

[0036] 37. Air return line;

[0037] 38. Safe discharge exhaust pipe;

[0038] 39. Safety valve;

[0039] 310. Back-blowing the intake pipe;

[0040] 311, backflush nitrogen valve;

[0041] 312, back-blowing heating valve;

[0042] 313. Back-blowing and heating air pipe;

[0043] 314. Backflush nitrogen pipe;

[0044] 315. Differential pressure sensor;

[0045] 316, pressure pipe;

[0046] 317, first drain valve;

[0047] 318, second drain valve;

[0048] 319. Sewage pipe;

[0049] 320. Exhaust valve. DETAILED DESCRIPTION

[0050] 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. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0051] like Figure 1 As shown, an embodiment of the utility model provides a sedimentation filtration backwashing device, comprising: a sedimentation part, wherein the two opposite sides of the sedimentation part are respectively an inlet side and an outlet side, the inlet side of the sedimentation part is connected to a sedimentation inlet pipeline 1, the sedimentation inlet pipeline 1 is used to input liquid into the sedimentation part, and the sedimentation part has a plurality of sedimentation tanks arranged in sequence from the inlet side to the outlet side, and the outlet side of the sedimentation part is connected to a low-temperature liquid pump 9; a backwashing part, connected to the outlet side of the sedimentation part, and the backwashing part is used to input a backwashing gas source into the sedimentation part; a sewage discharge part, connected to the bottom of the sedimentation tank to discharge impurities in the sedimentation part; a pressure difference detection part, connected to both the inlet side and the outlet side of the sedimentation part to detect the pressure difference between the inlet side and the outlet side of the sedimentation part.

[0052] In this scheme, the impurities in the input liquid are precipitated through the sedimentation tank in the sedimentation part, thereby achieving filtration. When there are many impurities in the sedimentation tank, which affects the fluid pressure entering the cryogenic liquid pump, the impurities are discharged through the sewage discharge part, and the sedimentation part is flushed by blowing air into the sedimentation part through the backwashing part to avoid blockage caused by accumulation of impurities. With this scheme, cleaning the filtered impurities is simple and time-saving, and the steps of powering off the cryogenic liquid pump 9, draining, removing cold-keeping pearl sand, backfilling cold-keeping pearl sand, power transmission, and re-precooling are omitted. There are fewer operation processes and it is easy to control risks.

[0053] Specifically, the backwashing section includes a backwashing air inlet pipe 310, a backwashing nitrogen pipe 314 and a backwashing heating air pipe 313. The backwashing air inlet pipe 310 is connected to the outlet side of the settling section, and the backwashing nitrogen pipe 314 and the backwashing heating air pipe 313 are respectively connected to the backwashing air inlet pipe 310. The backwashing nitrogen pipe 314 is used to input nitrogen into the settling section, and the backwashing heating air pipe 313 is used to input heating gas into the settling section.

[0054] Further, the backwashing part also includes a backwash nitrogen valve 311 and a backwash heating valve 312. The backwash nitrogen valve 311 is arranged on the backwash nitrogen pipe 314, and the backwash heating valve 312 is arranged on the backwash heating pipe 313. The backwash nitrogen valve 311 controls the opening and closing and flow rate of the backwash nitrogen pipe 314. The backwash heating valve 312 controls the opening and closing and flow rate of the backwash heating pipe 313.

[0055] like Figure 1 As shown, the sedimentation part includes a shell and a primary sedimentation tank 31, a primary baffle 32, an intermediate baffle 33, a secondary sedimentation tank 34 and a secondary baffle 35 which are sequentially arranged in the shell from the inlet side to the outlet side, and the primary sedimentation tank 31 and the secondary sedimentation tank 34 are both connected to the sewage discharge part. Through the above arrangement, when the fluid passes through multiple baffles, impurities in the fluid can be better settled.

[0056] Among them, the sewage discharge part includes a sewage pipe 319, a first sewage branch pipe and a second sewage branch pipe. The first-level sedimentation tank 31 is connected to the sewage pipe 319 through the first sewage branch pipe, and the second-level sedimentation tank 34 is connected to the sewage pipe 319 through the second sewage branch pipe. The first sewage branch pipe is provided with a first sewage valve 317, and the second sewage branch pipe is provided with a second sewage valve 318.

[0057] Through the above arrangement, the impurities settled in the primary sedimentation tank 31 are discharged through the first sewage branch pipe, and the impurities settled in the secondary sedimentation tank 34 are discharged through the second sewage branch pipe. The first sewage valve 317 is used to control the opening and closing of the first sewage branch pipe, and the second sewage valve 318 is used to control the opening and closing of the second sewage branch pipe.

[0058] In this solution, the differential pressure detection unit includes a pressure taking tube 316 and a differential pressure sensor 315 . Both ends of the pressure taking tube 316 are respectively connected to the inlet side and the outlet side of the sedimentation unit. The differential pressure sensor 315 is arranged on the pressure taking tube 316 .

[0059] The differential pressure sensor 315 is used to detect the pressure difference between the inlet and outlet sides of the sedimentation section. If the pressure difference between the inlet and outlet sides of the sedimentation section is detected to be greater than the set value, it is considered that there are too many impurities in the sedimentation section or blockage has occurred, and operations such as discharging impurities and flushing with gas are required.

[0060] In this solution, the sedimentation filtration backwashing device further includes a safety discharge exhaust pipe 38, which is connected to the top of the sedimentation part, and is provided with an exhaust valve 320 and a safety valve 39. When the pressure in the sedimentation part reaches a certain value, the exhaust valve 320 or the safety valve 39 opens to discharge the fluid to prevent the sedimentation part from overpressure explosion due to gasification of the cryogenic liquid.

[0061] Furthermore, the sedimentation filtration backwashing device also includes a return air pipeline 37, which is connected to the top of the sedimentation part, and a return air valve 36 is provided on the return air pipeline 37. This can prevent the inlet pipeline from forming a negative pressure to suck and deform the sedimentation part when the cryogenic liquid pump 9 starts to feed liquid.

[0062] like Figure 1 As shown, the sedimentation filtration backwashing device also includes a sedimentation outlet pipeline 4 and a Y-type metal filter 6. The outlet side of the sedimentation part is connected through the sedimentation outlet pipeline 4 and the Y-type metal filter 6. The sedimentation outlet pipeline 4 is provided with an outlet stop valve 5, and the sedimentation inlet pipeline 1 is provided with an inlet stop valve 2.

[0063] The fluid filtered by the sedimentation part is further filtered by the Y-shaped metal filter 6, which improves the efficiency of the filtration system. Moreover, the sedimentation part has filtered most of the impurities, and the Y-shaped metal filter 6 is basically not blocked.

[0064] Furthermore, the Y-type metal filter 6 is connected to the low-temperature inlet pipeline 8 through the low-temperature inlet valve 7, the low-temperature inlet pipeline 8 is connected to the low-temperature liquid pump 9, the low-temperature liquid pump 9 is connected to the low-temperature outlet pipeline 10, and the low-temperature outlet pipeline 10 is connected to the delivery pipeline 12 through the low-temperature outlet valve 11.

[0065] The outlet stop valve 5 and the low-temperature inlet valve 7 can ensure that the low-temperature liquid pump 9 remains in a pre-cooling state, which facilitates the rapid start-up of the low-temperature liquid pump 9 after the sedimentation part and the Y-type metal filter 6.

[0066] When in use, the bottom of the sedimentation section is connected to the drain pipe 319 through the first drain valve 317 and the second drain valve 318 respectively. After the sedimentation section is pressurized, the gravity and impulse of the liquid are used to discharge impurities from the primary sedimentation tank 31 and the secondary sedimentation tank 34 respectively, and then the backwash nitrogen valve 311 or the backwash heating air valve 312 is opened for purging, and then the inlet stop valve 2 is opened to fill the liquid, and the above steps are repeated. According to the value of the pressure difference sensor 315, it is confirmed whether the backwashing is qualified.

[0067] This solution has the following characteristics and effects:

[0068] 1. Sedimentation and filtration have better effects. Through the sedimentation part, the impurities in the cryogenic liquid are further reduced, and the impurities entering the cryogenic liquid pump and damaging the equipment are reduced.

[0069] 2. The cleaning process is better, the operation is simpler and less time-consuming. The process handover is removed and the filtered impurities can be cleaned through process valve control, which is easy to operate. It also eliminates the need to shut down the cryogenic liquid pump, drain the liquid, remove the cold-keeping pearl sand, backfill the cold-keeping pearl sand, supply power, and re-precooling. There are fewer operating processes and it is easy to control risks. The maintenance time can be reduced to 30 minutes, which is more than 90% less than before.

[0070] 3. Save maintenance costs. The filtered impurities can be directly cleaned through the sedimentation section and backwashing section without the need for manual cleaning costs.

[0071] 4. It avoids the impact on the pre-cooling state of the cryogenic liquid pump and significantly reduces the emergency start-up vacuum period. After setting up the sedimentation section, the valve can be used to cut off the cryogenic liquid in the cryogenic liquid pump without removing it, maintaining the pre-cooling state of the pump and reducing the cleaning time to 30 minutes. After the cleaning work is completed, you only need to fill the sedimentation section with liquid, and after connecting the valve, you can start the cryogenic liquid pump immediately, avoiding the low-temperature liquid pump when cleaning the inlet filter, after re-pre-cooling, poor cold tightness, causing a large amount of cryogenic liquid leakage accidents. It also avoids the long-term absence of emergency standby cryogenic liquid pumps, resulting in the air separation unit's cryogenic liquid equipment jumping, the standby equipment cannot be started, and the product output is greatly reduced.

[0072] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

[0073] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0074] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being only exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0075] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0076] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0077] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only to facilitate the distinction between corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

Claims

1. A sedimentation filtration backwashing device, characterized in that: include: A sedimentation part, wherein two opposite sides of the sedimentation part are respectively an inlet side and an outlet side, the inlet side of the sedimentation part is connected to a sedimentation inlet pipeline (1), the sedimentation inlet pipeline (1) is used to input liquid into the sedimentation part, the sedimentation part has a plurality of sedimentation tanks arranged in sequence from the inlet side to the outlet side, and the outlet side of the sedimentation part is connected to a cryogenic liquid pump (9); A backwashing part connected to the outlet side of the settling part, the backwashing part is used to input a backwashing gas source into the settling part; A sewage discharge part connected to the bottom of the sedimentation tank to discharge impurities in the sedimentation part; The pressure difference detection part is connected to both the inlet side and the outlet side of the sedimentation part to detect the pressure difference between the inlet side and the outlet side of the sedimentation part.

2. The sedimentation filtration backwashing device according to claim 1 is characterized in that: The backwashing section comprises a backwashing air inlet pipe (310), a backwashing nitrogen pipe (314) and a backwashing heating air pipe (313); the backwashing air inlet pipe (310) is connected to the outlet side of the settling section; the backwashing nitrogen pipe (314) and the backwashing heating air pipe (313) are respectively connected to the backwashing air inlet pipe (310).

3. The sedimentation filtration backwashing device according to claim 2 is characterized in that: The backwashing section further comprises a backwash nitrogen valve (311) and a backwash heating gas valve (312); the backwash nitrogen valve (311) is arranged on the backwash nitrogen pipe (314); and the backwash heating gas valve (312) is arranged on the backwash heating gas pipe (313).

4. The sedimentation filtration backwashing device according to claim 1, characterized in that: The sedimentation section comprises an outer shell and a primary sedimentation tank (31), a primary baffle (32), an intermediate baffle (33), a secondary sedimentation tank (34) and a secondary baffle (35) which are arranged in sequence in the outer shell from the inlet side to the outlet side. The primary sedimentation tank (31) and the secondary sedimentation tank (34) are both connected to the sewage discharge section.

5. The sedimentation filtration backwashing device according to claim 4 is characterized in that: The sewage discharge part includes a sewage discharge pipe (319), a first sewage discharge branch pipe and a second sewage discharge branch pipe. The first-level sedimentation tank (31) is connected to the sewage discharge pipe (319) through the first sewage discharge branch pipe, and the second-level sedimentation tank (34) is connected to the sewage discharge pipe (319) through the second sewage discharge branch pipe. The first sewage discharge branch pipe is provided with a first sewage discharge valve (317), and the second sewage discharge branch pipe is provided with a second sewage discharge valve (318).

6. The sedimentation filtration backwashing device according to claim 1, characterized in that: The differential pressure detection unit comprises a pressure taking tube (316) and a differential pressure sensor (315), the two ends of the pressure taking tube (316) are respectively connected to the inlet side and the outlet side of the sedimentation unit, and the differential pressure sensor (315) is arranged on the pressure taking tube (316).

7. The sedimentation filtration backwashing device according to claim 1, characterized in that: The sedimentation filtration backwashing device further comprises a safety discharge exhaust pipe (38), wherein the safety discharge exhaust pipe (38) is connected to the top of the sedimentation part, and an exhaust valve (320) and a safety valve (39) are arranged on the safety discharge exhaust pipe (38).

8. The sedimentation filtration backwashing device according to claim 1, characterized in that: The sedimentation filtration backwashing device further comprises an air return pipeline (37), wherein the air return pipeline (37) is connected to the top of the sedimentation part, and an air return valve (36) is arranged on the air return pipeline (37).

9. The sedimentation filtration backwashing device according to claim 1, characterized in that: The sedimentation filtration backwashing device further comprises a sedimentation outlet pipeline (4) and a Y-shaped metal filter (6); the outlet side of the sedimentation part is connected via the sedimentation outlet pipeline (4) and the Y-shaped metal filter (6); an outlet stop valve (5) is provided on the sedimentation outlet pipeline (4); and an inlet stop valve (2) is provided on the sedimentation inlet pipeline (1).

10. The sedimentation filtration backwashing device according to claim 9, characterized in that: The Y-shaped metal filter (6) is connected to a low-temperature inlet pipeline (8) via a low-temperature inlet valve (7), the low-temperature inlet pipeline (8) is connected to the low-temperature liquid pump (9), the low-temperature liquid pump (9) is connected to a low-temperature outlet pipeline (10), and the low-temperature outlet pipeline (10) is connected to a delivery pipeline (12) via a low-temperature outlet valve (11).

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