Pollution discharge buffer device and pollution discharge pry

Abstract

The invention relates to the field of natural gas extraction and transportation, in particular to a pollution discharge buffer device and a pollution discharge pry. The pollution discharge buffer device comprises a control valve, a throttling device and a buffer mechanism which are communicated in sequence; the buffering mechanism is provided with a buffering space, a buffering inlet and a buffering outlet, the buffering inlet and the buffering outlet are both communicated with the buffering space, the buffering inlet is communicated with the throttling device, an included angle is formed between the buffering inlet and the buffering outlet, a groove is formed in the buffering space, and the buffering inlet is communicated with the throttling device. The groove is opposite to the buffer inlet; sewage is discharged into the buffer mechanism for speed reduction after the flow is changed through the throttling device, so that stabbing leakage caused by high-speed impact of silt on a pipeline or a valve is avoided, equipment damage is reduced, maintenance cost is saved, maintenance time is shortened, and sewage treatment efficiency is improved; the pollution discharge pry comprises a bottom plate, a separator and a pollution discharge buffer device, and the separator and the pollution discharge buffer device are integrated on the bottom plate in a skid-mounted mode and are convenient to move and adjust in position.

Description

Technical Field

[0001] The invention relates to the field of natural gas extraction and transportation, and in particular to a sewage discharge buffer device and a sewage discharge skid. Background Art

[0002] The steam trap is a mechanical valve commonly used to automatically drain the separator during gas collection and transportation. The steam trap is mainly composed of an internal float connected to the valve according to the principle of communicating vessels to drive the valve core so that it can automatically drain when the liquid level in the separator is too high, and automatically close when the liquid level in the separator is low, thereby avoiding liquid leakage in the separator due to untimely drainage during manual drainage and a large amount of natural gas entering the liquid storage tank due to untimely drainage closure, saving manpower and ensuring normal production.

[0003] However, some newly commissioned gas wells have undergone large-volume fracturing modifications, which is accompanied by large liquid output and easy sand production. Due to the high-speed impact of mud and sand, valves and pipelines used for drainage often leak, posing production risks.

[0004] Therefore, there is an urgent need for a technical solution to solve the technical problem of valve and pipeline leakage for draining liquid after fracturing transformation of gas wells. Summary of the invention

[0005] The purpose of the present invention is to provide a sewage discharge buffer device and a sewage discharge skid to solve the technical problem of leakage of valves and pipelines for discharging liquid after fracturing transformation of a gas well.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is: A sewage discharge buffer device comprises a control valve, a throttling device and a buffer mechanism which are connected in sequence; the buffer mechanism is provided with a buffer space, a buffer inlet and a buffer outlet, the buffer inlet and the buffer outlet are both connected with the buffer space, the buffer inlet is connected with the throttling device, the buffer inlet and the buffer outlet form an angle, a groove is provided in the buffer space, and the groove is arranged opposite to the buffer inlet.

[0007] A sewage discharge buffer device of the present invention is composed of a control valve, a throttling device and a buffer mechanism connected in sequence. Sewage flows into the throttling device through the control valve. The throttling device changes the flow rate of the sewage flowing through and then discharges it into the buffer inlet, so that the sewage enters the buffer space. The sewage decelerated in the buffer space is discharged from the buffer outlet; the buffer inlet and the buffer outlet form an angle, so that the sewage changes its flow direction when passing through the buffer mechanism, slows down the flow rate of the sewage, and thus reduces the scouring of the pipeline and the device by sediment; a groove is provided in the buffer space, and the groove is arranged opposite to the buffer inlet. After entering the buffer space, the sewage first impacts the groove, and the sewage passing through the groove is decelerated and changes its flow direction. The low-speed flowing sewage can prevent valves and pipelines from leaking.

[0008] As a preferred solution of the present invention, the buffer outlet is connected to an outlet pipe section, and the outlet pipe section is higher than the buffer mechanism. By arranging the outlet pipe section higher than the buffer mechanism, sewage is always retained in the buffer mechanism, and the retained sewage acts as a buffer medium to buffer the sewage entering the buffer space and slow down the speed of sediment.

[0009] As a preferred embodiment of the present invention, the throttling device is provided with a throttling space, a throttling inlet and a throttling outlet. The throttling inlet and the throttling outlet are both connected to the throttling space, the throttling inlet and the throttling outlet form an angle, the throttling inlet is connected to the control valve, and a throttling nozzle is provided on the side of the throttling space close to the throttling outlet. A throttling device is provided to reduce the flow rate before entering the buffer mechanism, so that the buffer mechanism can play a better buffering role for the sewage. The throttling device includes a right-angle elbow, and a groove structure opposite to the throttling inlet is provided in the throttling space, so that the sewage entering the throttling space is first decelerated, and the flow rate is adjusted by the throttling nozzle before being discharged from the throttling outlet, so as to ensure that the flow rate of sewage entering the buffer device is a predetermined flow rate.

[0010] As a preferred solution of the present invention, the throttling device is provided with a maintenance port, the maintenance port is arranged opposite to the throttling outlet, and a blind plate is provided on the maintenance port. The maintenance port and the throttling outlet are arranged opposite to each other, and the throttling nozzle can be maintained by opening the maintenance port to avoid removing the throttling device, and a blind plate is provided on the maintenance port for sealing; the size of the maintenance port needs to be constructed so that the throttling nozzle can be taken out.

[0011] As a preferred solution of the present invention, the throttling nozzle is detachably connected to the throttling space. The throttling nozzle and the throttling space are detachably connected, and different throttling nozzles can be replaced according to the requirements of the segment buffer mechanism, thereby controlling the flow rate entering the buffer mechanism.

[0012] As a preferred solution of the present invention, the control valve comprises an electric valve, and the electric valve is connected to a control device. The electric valve is connected to the control device, and the control device controls the electric valve, thereby realizing automatic control of the switch of the electric valve.

[0013] As a preferred solution of the present invention, the control device includes an electronic liquid level meter and a PLC, the PLC is connected to the electric valve control, and the electronic liquid level meter is connected to the PLC for communication. The electronic liquid level meter obtains the liquid level in the separator, and the obtained liquid level information is transmitted to the PLC for comparison with the set valve opening threshold. When the liquid level is higher than the set valve opening threshold, the PLC controls the electric valve to open, and when the liquid level is lower than the set valve closing threshold, the PLC controls the electric valve to close, thereby realizing automatic drainage of the separator.

[0014] As a preferred solution of the present invention, the buffer mechanism is provided with a sewage outlet, and the sewage outlet is connected to a sewage valve. The buffer mechanism is provided with a sewage outlet, and the sewage outlet is connected to a sewage valve to control the sewage discharge time; the sewage outlet and the buffer outlet are respectively located on both sides of the groove.

[0015] As a preferred solution of the present invention, the outlet pipe section is provided with a flow meter. The flow meter is provided on the outlet pipe section to measure the discharged sewage.

[0016] A sewage discharge skid comprises a separator, a base plate and the above-mentioned sewage discharge buffer device, wherein the separator and the sewage discharge buffer device are both arranged on the base plate, the separator comprises a drainage pipeline, the control valve is connected to the drainage pipeline, and the buffer outlet is connected to a liquid storage tank.

[0017] The sewage is discharged into the liquid storage tank after being buffered by the sewage discharge buffer device, so that sewage can be discharged into the liquid storage tank in a timely manner and the pipeline can be protected from being directly impacted by the liquid under high pressure. The separator and the sewage discharge buffer device are both integrated and skid-mounted on the chassis, which is easy to carry and adjust the position.

[0018] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. A sewage discharge buffer device of the present invention is composed of a control valve, a throttling device and a buffer mechanism connected in sequence. Sewage flows into the throttling device through the control valve. The throttling device changes the flow rate of the sewage flowing through and then discharges it into the buffer inlet, so that the sewage enters the buffer space. The sewage decelerated in the buffer space is discharged from the buffer outlet; the buffer inlet and the buffer outlet form an angle, so that the sewage changes its flow direction when passing through the buffer mechanism, slows down the flow rate of the sewage, and thus reduces the scouring of the pipeline and the device by sediment; a groove is provided in the buffer space, and the groove is arranged opposite to the buffer inlet. After entering the buffer space, the sewage first impacts the groove, and the sewage passing through the groove is decelerated and changes its flow direction. The low-speed flowing sewage can prevent valves and pipelines from leaking.

[0019] 2. The sewage discharge buffer device of the present invention changes the flow rate of sewage through a throttling device and then is discharged into a buffer mechanism to reduce the speed, thereby preventing high-speed mud and sand from impacting pipes or valves and causing leakage, reducing equipment damage, saving maintenance costs, reducing maintenance time, and improving sewage treatment efficiency, having good economic value and practical value.

[0020] 3. In a sewage discharge skid of the present invention, the liquid discharge pipeline of the separator is connected with the sewage discharge buffer device. The sewage enters the liquid storage tank after being decelerated by the sewage discharge buffer device, so as to prevent mud and sand from impacting the pipelines and devices along the way and causing leakage. The control valve controls the sewage to be discharged into the liquid storage tank after being buffered by the sewage discharge buffer device. The sewage is discharged in time, and the pipeline is protected from being directly impacted by the liquid under high pressure, thereby improving the operation safety. The separator and the sewage discharge buffer device are both integrated and skid-mounted on the chassis, which is easy to carry and adjust the position. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the connection structure of a sewage discharge buffer device in Example 1; Figure 2 is a schematic cross-sectional structural diagram of the buffer mechanism of Example 1; Figure 3 is a schematic cross-sectional view of the throttling device of Example 1; Figure 4 This is a schematic diagram of the connection structure of a sewage discharge buffer device in Example 2; Figure 5 It is a connection diagram of a sewage discharge skid of Example 4.

[0022] icon: 1-control valve, 2-throttling device, 3-buffer mechanism, 4-outlet pipe section, 5-drain valve, 6-blind plate, 7-separator, 8-liquid storage tank, 9-drain device, 10-drainage pipeline, 11-first sewage branch, 12-second sewage branch, 13-drainage branch, 21-throttling space, 22-throttling inlet, 23-throttling outlet, 24-throttling nozzle, 25-maintenance port, 31-buffer space, 32-buffer inlet, 33-buffer outlet, 34-groove, 35-drainage outlet. DETAILED DESCRIPTION

[0023] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0024] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0025] Example 1 like Figure 1-Figure 3A sewage discharge buffer device shown in the figure includes a control valve 1, a throttling device 2 and a buffer mechanism 3 which are connected in sequence; the buffer mechanism 3 is provided with a buffer space 31, a buffer inlet 32 ​​and a buffer outlet 33, the buffer inlet 32 ​​and the buffer outlet 33 are both connected to the buffer space 31, the buffer inlet 32 ​​is connected to the throttling device 2, the buffer inlet 32 ​​and the buffer outlet 33 form an angle, a groove 34 is provided in the buffer space 31, and the groove 34 is arranged opposite to the buffer inlet 32.

[0026] Specifically, the buffer mechanism 3 is further provided with a sewage outlet 35 , the buffer inlet 32 ​​and the buffer outlet 33 form a ninety-degree angle, the buffer inlet 32 ​​and the sewage outlet 35 form a ninety-degree angle, and the buffer outlet 33 and the sewage outlet 35 are respectively arranged on both sides of the groove 34 .

[0027] Specifically, the buffer outlet 33 is arranged upward, and the sewage outlet 35 is arranged downward, so that part of sewage is always retained in the buffer mechanism 3. When the control valve 1 is opened, the sewage enters the buffer space 31 and first impacts the sewage retained in the buffer space 31. The retained sewage decelerates the newly discharged sewage and sediment. The sewage continues to flow to the groove 34 and is blocked by the groove 34, which plays a buffering role for the sewage.

[0028] Specifically, the throttling device 2 is composed of a throttling space 21, a throttling inlet 22 and a throttling outlet 23. The throttling inlet 22 and the throttling outlet 23 are both connected to the throttling space 21. The throttling inlet 22 and the throttling outlet 23 form a ninety-degree angle. The throttling inlet 22 is connected to the control valve 1, so that the sewage enters the throttling space 21 through the throttling inlet 22. A throttling nozzle 24 is arranged in the throttling space 21. The throttling nozzle 24 is located on the side of the throttling space 21 close to the throttling outlet 23. The throttling nozzle 24 is nested with the throttling space 21 to achieve a good throttling effect. The throttled sewage is discharged into the sewage buffer device through the throttling outlet 23. The throttling outlet 23 is connected to the buffer inlet 32.

[0029] Specifically, the throttling nozzle 24 is coated with a CrC coating, the hardness of the CrC coating is 41.5 MPa, and the cross-sectional microhardness is HV0.3701, so that the throttling nozzle 24 can work for a long time in an environment containing mud and sand, thereby improving durability.

[0030] Specifically, a groove structure is arranged in the throttling space 21, and the groove structure is arranged opposite to the throttling inlet 22, so that the sewage entering the throttling space 21 first impacts the groove structure, which plays a buffering role on the entering sewage, and then the sewage passes through the throttling nozzle 24, and the throttling nozzle 24 adjusts the flow rate of sewage discharge so as to better buffer the sewage in the buffer structure.

[0031] Specifically, the throttling nozzle 24 is detachably connected to the throttling space 21 , and the flow rate of the sewage flowing to the buffer mechanism 3 can be adjusted by replacing the throttling nozzles 24 of different specifications.

[0032] Specifically, a maintenance port 25 is provided on the throttling device 2, and a blind plate 6 is covered on the maintenance port 25. The throttling space 21 is kept sealed by covering the blind plate 6. The maintenance port 25 is arranged opposite to the throttling outlet 23, so that the throttling nozzle 24 is easy to install and disassemble, and the throttling nozzle 24 can be taken out of the throttling space 21 from the maintenance port 25.

[0033] Specifically, the control valve 1 is an electric valve, which is connected to the PLC so that the electric valve is controlled by the PLC and can automatically open and close the valve. The PLC is connected to an electronic liquid level meter, which can measure the upstream liquid level information and transmit the liquid level information back to the PLC to achieve automatic sewage discharge.

[0034] Specifically, the buffer outlet 33 is connected to the outlet pipe section 4, and a flow meter is arranged on the outlet pipe section 4. The flow meter records the amount of sewage discharged into the liquid storage tank 8. The flow meter is preferably an electromagnetic liquid flow meter.

[0035] Preferably, the sewage outlet 35 is connected to a sampling valve.

[0036] A sewage discharge buffer device of the present embodiment, when in use, the electronic liquid level meter feeds back the liquid level information to the PLC. When the liquid level is lower than the valve closing threshold set by the PLC, the PLC controls the electric ball valve to close the ball valve, and some of the undischarged liquid retained in the buffer mechanism 3 is used as a buffer; when the liquid level is higher than the valve opening threshold set by the PLC, the PLC controls the electric ball valve to open, so that the sewage is discharged through the electric valve, and the discharged sewage passes through the oil nozzle built into the throttling device 2 to reduce the flow rate, and then accumulates in the buffer mechanism 3 to protect the pipeline and reduce the liquid flow rate, thereby reducing pipeline and valve leakage.

[0037] A sewage discharge buffer device of the present embodiment is composed of a control valve 1, a throttling device 2 and a buffer mechanism 3 connected in sequence. The sewage flows into the throttling device 2 through the control valve 1. The throttling device 2 changes the flow rate of the sewage flowing through and then discharges it into the buffer inlet 32, so that the sewage enters the buffer space 31. The sewage decelerated in the buffer space 31 is discharged from the buffer outlet 33; the buffer inlet 32 ​​and the buffer outlet 33 form an angle, so that the sewage changes its flow direction when passing through the buffer mechanism 3, slowing down the flow rate of the sewage, thereby reducing the scouring of the pipeline and the device by sediment; a groove 34 is provided in the buffer space, and the groove 34 is arranged opposite to the buffer inlet 32. After entering the buffer space 31, the sewage first impacts the groove 34, and the sewage passing through the groove 34 is decelerated and changes its flow direction. The low-speed flowing sewage can prevent valves and pipelines from leaking.

[0038] Example 2 like Figure 4 The sewage discharge buffer device shown has a structure that is substantially the same as that of Embodiment 1, but differs from Embodiment 1 in that the horizontal height of the outlet pipe section 4 is arranged to be higher than the buffer mechanism 3 .

[0039] A sewage discharge buffer device in this embodiment forms a height difference between the outlet pipe section 4 and the buffer mechanism 3 by making the horizontal height of the outlet pipe section 4 higher than the buffer mechanism 3, thereby ensuring that sewage is always retained in the buffer mechanism 3 for buffering, thereby ensuring the safety of the rear pipeline and valve.

[0040] Example 3 The sewage discharge buffer device of this embodiment has a structure substantially the same as that of the embodiment 1, but is different from the embodiment 1 in that the throttling device 2 is a throttling valve.

[0041] Preferably, the throttle valve is an electronic throttle valve, which is connected to a PLC control system to achieve control and regulation of the throttling flow.

[0042] A sewage discharge buffer device in this embodiment can control the flow rate through a throttle valve to avoid disassembly of the throttling device 2.

[0043] Example 4 like Figure 5 The sewage skid shown includes a separator 7 and a sewage buffer device of Example 1 / Example 2 / Example 3, wherein the separator 7 and the sewage buffer device are both arranged on the bottom plate, the separator 7 includes a drainage pipeline 10, the control valve 1 is connected to the drainage pipeline 10, and the buffer outlet 33 is connected to the liquid storage tank 8.

[0044] Specifically, the separator 7 and the sewage discharge buffer device are both fixedly connected to the top surface of the bottom plate.

[0045] Specifically, the discharge pipeline 10 is communicated with the buffer outlet 33 .

[0046] Specifically, the liquid discharge pipeline 10 is connected to a first sewage discharge branch 11 , and the first sewage discharge branch 11 is connected to the sewage discharge device 9 .

[0047] Specifically, the drain valve 5 provided in the buffer mechanism 3 is connected to the drain device 9 through the second drain branch 12, and an electric drain valve is provided on the drain branch, and the electric drain valve is connected to the PLC control.

[0048] Specifically, the liquid discharge pipeline 10 can be connected to the liquid storage tank 8 through the liquid discharge branch 13, and an electric stop valve is arranged on the liquid discharge branch 13, and the electric stop valve is connected to the PLC control.

[0049] In this embodiment, a sewage discharge skid has four paths for sewage discharge: Path 1: separator 7 - drainage pipeline 10 - first sewage branch 11 - sewage discharge device 9, this path is used to discharge impurities such as mud and sand in the separator 7 into the sewage discharge device 9 through the flow of sewage; Path 2: separator 7 - drainage pipeline 10 - drainage branch 13 - liquid storage tank 8. This path enables the sewage in the separator 7 to be directly discharged into the liquid storage tank 8. Path 3: separator 7 - drainage pipeline 10 - sewage buffer device - liquid storage tank 8. The sewage on this path enters the liquid storage tank 8 after being buffered by the sewage buffer device. The low-speed flow of sewage can prevent punctures and leakages in pipes and valves.

[0050] Path 4: separator 7 - drainage pipeline 10 - sewage buffer device - second sewage branch 12 - sewage device 9. This path is used for low-speed sewage to discharge the sediment accumulated in the sewage buffer device.

[0051] Example 5 A sewage pipeline modification method of this embodiment includes a sewage buffer device of embodiment 1 / embodiment 2 / embodiment 3, and also includes a sewage pipeline to be modified. The sewage pipeline modification effect is achieved by replacing the drain valve in the sewage pipeline with the sewage buffer device.

[0052] The transformation steps are as follows: 1. Remove the drain valve on the original sewage pipeline; 2. Connect the pipe section upstream of the original steam trap to the control valve 1, and connect the pipe section downstream of the original steam trap to the buffer outlet 33; 3. Connect the sewage outlet 35 to the sewage discharge device 9.

[0053] A sewage pipeline reconstruction method of the present embodiment connects a sewage buffer device in series in the sewage pipeline to achieve sewage buffering, thereby avoiding puncture leakage in the pipe section and device downstream of the original steam trap, saving maintenance costs; the control valve is intelligently controlled by PLC to reduce manpower consumption.

[0054] Example 6 A sewage pipeline modification method of this embodiment includes a sewage buffer device of embodiment 1 / embodiment 2 / embodiment 3, and also includes a sewage pipeline to be modified, the sewage buffer device is connected in parallel with a steam trap, and the steam trap is replaced by a valve controlled by a PLC.

[0055] The transformation steps are as follows; 1. Replace the pipe section upstream of the original steam trap with the upstream three-way pipe section; 2. Replace the pipe section downstream of the original steam trap with the downstream three-way pipe section; 3. The control valve 1 of the sewage discharge buffer device is connected to the upstream three-way pipe section, and the buffer outlet 33 of the sewage discharge buffer device is connected to the downstream three-way pipe section.

[0056] 4. Replace the steam trap with a valve controlled by PLC.

[0057] A sewage pipeline reconstruction method of the present embodiment, when performing sewage buffering, the PLC controls the sewage to enter the sewage buffer device and then discharge it into the liquid storage tank 8; when the sewage buffer device needs to be maintained, the valve of the replacement drain valve is opened, and the sewage directly enters the liquid storage tank 8 without affecting sewage discharge.

[0058] Example 7 A sewage pipeline modification method of this embodiment includes a sewage pipeline and a sewage skid of embodiment 5, and the sewage pipeline is connected to the sewage skid.

[0059] Specifically, the sewage pipeline is connected to the separator 7 of the sewage skid, so that the sewage enters the separator 7 for solid-liquid separation, and the separated sewage enters the sewage buffer device of the sewage skid to slow down the discharge speed and then is discharged into the liquid storage tank 8.

[0060] In a sewage pipeline reconstruction method of this embodiment, the sewage pipeline is connected to a sewage skid to separate and store the sewage.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A sewage discharge buffer device, characterized in that: The invention comprises a control valve (1), a throttling device (2) and a buffer mechanism (3) which are connected in sequence; the buffer mechanism (3) is provided with a buffer space (31), a buffer inlet (32) and a buffer outlet (33); the buffer inlet (32) and the buffer outlet (33) are both connected to the buffer space (31); the buffer inlet (32) is connected to the throttling device (2); the buffer inlet (32) and the buffer outlet (33) form an angle; a groove (34) is provided in the buffer space (31); the groove (34) is arranged opposite to the buffer inlet (32).

2. A sewage discharge buffer device as claimed in claim 1, characterized in that: The buffer outlet (33) is connected to an outlet pipe section (4), and the outlet pipe section (4) is higher than the buffer mechanism (3).

3. A sewage discharge buffer device as claimed in claim 1, characterized in that: The throttling device (2) is provided with a throttling space (21), a throttling inlet (22) and a throttling outlet (23); the throttling inlet (22) and the throttling outlet (23) are both connected to the throttling space (21); the throttling inlet (22) and the throttling outlet (23) form an angle; the throttling inlet (22) is connected to the control valve (1); and a throttling nozzle (24) is provided on one side of the throttling space (21) close to the throttling outlet (23).

4. A sewage discharge buffer device as claimed in claim 3, characterized in that: The throttling device (2) is provided with a maintenance port (25), the maintenance port (25) is arranged opposite to the throttling outlet (23), and a blind plate (6) is provided on the maintenance port (25).

5. A sewage discharge buffer device as claimed in claim 4, characterized in that: The throttling nozzle (24) is detachably connected to the throttling space (21).

6. A sewage discharge buffer device as claimed in claim 1, characterized in that: The control valve (1) comprises an electric valve, and the electric valve is connected to a control device.

7. A sewage discharge buffer device as claimed in claim 6, characterized in that: The control device comprises an electronic liquid level meter and a PLC, wherein the PLC is control-connected to the electric valve, and the electronic liquid level meter is communicatively connected to the PLC.

8. A sewage discharge buffer device according to any one of claims 1 to 7, characterized in that: The buffer mechanism (3) is provided with a sewage outlet (35), and the sewage outlet (35) is connected to a sewage valve (5).

9. A sewage discharge buffer device as claimed in claim 2, characterized in that: The outlet pipe section (4) is provided with a flow meter.

10. A sewage discharge skid, characterized in that: It comprises a separator (7), a bottom plate and a sewage discharge buffer device according to any one of claims 1 to 9, wherein the separator (7) and the sewage discharge buffer device are both arranged on the bottom plate, the separator (7) comprises a drainage pipeline (10), the control valve (1) is connected to the drainage pipeline (10), and the buffer outlet (33) is connected to a liquid storage tank (8).

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