Multi-phase flow gas-liquid separation and treatment device

Abstract

The invention relates to the technical field of oil-gas separation equipment, in particular to a multiphase flow gas-liquid separation and treatment device which comprises a liquid collection pool. A liquid outlet is formed in the outer side face of the liquid collecting pool, a first electric control valve is installed on the liquid outlet, a cylindrical barrel is installed on the upper surface of the liquid collecting pool, the cylindrical barrel is connected with an annular flow dividing pipe through a flow guide pipe arranged on the outer side face of the cylindrical barrel, a conical gradual change pipe is installed on the outer side face of the annular flow dividing pipe, and a flow sensor is installed on the conical gradual change pipe. According to the multiphase flow gas-liquid separation and treatment device, solid impurities on the surface of the umbrella-plate separator can be cleaned in real time, smoothness of meshes of the umbrella-plate separator is effectively guaranteed, meanwhile, the working efficiency of the gas-liquid separator is guaranteed, and the multiphase flow gas-liquid separation and treatment device is suitable for large-scale popularization and application. When the pressure in the gas-liquid separation and treatment device is too large, the safety structure is broken firstly, and the pressure of the tank body is relieved, so that serious accidents are avoided.

Description

Technical Field

[0001] The present application relates to the technical field of oil-gas separation equipment, and specifically to a multiphase flow gas-liquid separation and processing device. Background Art

[0002] The oil in underground oil and gas reservoirs is an extremely complex mixture, containing hydrocarbons, non-hydrocarbon compounds and a variety of trace elements, and also contains a large amount of hydrocarbon gas and non-hydrocarbon gas, as well as hydrocarbon and non-hydrocarbon solid substances. The output of oil wells often contains crude oil, condensate oil, natural gas, water, impurities and foreign substances (such as oil displacement agents), all of which require effective separation and processing processes to extract qualified oil and natural gas.

[0003] The development of marine oil and gas resources by human beings has gone through the stages from shallow water to deep water and then to ultra-deep water. As the inevitable trend and mainstream mode of deepwater oil and gas resource exploitation in the future, the underwater production system uses gas-liquid separation and processing equipment to separate hydrocarbon gases with high water content. Traditional gas-liquid separation mostly includes a cylindrical cylinder with an umbrella plate separator inside. When the water droplets inside the gas-liquid separation and processing equipment are deposited downward under the action of weight and the gas is transported upward, when the hydrocarbon gas with high water content passes through the umbrella plate separator, the water droplets contained in the hydrocarbon gas condense on the umbrella plate separator and flow downward.

[0004] Since the hydrocarbon gas extracted from the drilling platform contains a large amount of solid particle impurities, the pores of the umbrella plate separator are very easy to be blocked, resulting in the need for regular manual cleaning of the umbrella plate separator. During the cleaning process, the gas-liquid separation and treatment device needs to be shut down, affecting the normal production. At the same time, the existing gas-liquid separation and treatment device is prone to accidents when the discharge pipeline is blocked and the incoming flow continues to increase. Summary of the invention

[0005] The present application provides a multiphase flow gas-liquid separation and treatment device, which can clean solid impurities on the surface of the umbrella plate separator in real time, effectively ensuring the smoothness of the umbrella plate separator mesh and the efficiency of the gas-liquid separator. Moreover, when the internal pressure of the gas-liquid separation and treatment device is too high, the safety structure will break first and the tank body will be depressurized, thereby avoiding the occurrence of serious accidents, and can effectively solve the problems in the background technology.

[0006] To achieve the above-mentioned objectives, the present application provides the following technical solutions: a multiphase flow gas-liquid separation and treatment device, comprising a liquid collecting tank; a drain port is installed on the outer side of the liquid collecting tank, an electrically controlled valve is installed on the drain port, a cylindrical body is installed on the upper surface of the liquid collecting tank, the cylindrical body is connected to an annular diverter pipe through a guide pipe arranged on its outer side, a conical gradient pipe is installed on the outer side of the annular diverter pipe, a flow sensor is installed on the conical gradient pipe, an L-shaped baffle is provided on the inner side of the cylindrical body near the guide pipe, a top umbrella plate separator and a bottom umbrella plate separator are provided on the inner side of the cylindrical body from top to bottom, and the L-shaped baffle is arranged between the top umbrella plate separator and the bottom umbrella plate separator.

[0007] A reducer is provided on the upper end face of the cylindrical body, a mounting plate is provided on the upper end face of the reducer, a maintenance cover is sealed and connected to the upper end face of the mounting plate by bolts, a PVC plate is provided between the maintenance cover and the mounting plate, and at least one safety through hole is provided on the upper surface of the maintenance cover.

[0008] An air outlet pipe is provided on the outer side of the reducer, on which an electric-controlled valve 2 is installed; a sealed box is installed on the upper surface of the maintenance cover; a lifting plate is slidably connected to the inside of the sealed box; a negative pressure pipe and a motor are provided on the upper surface of the lifting plate; the upper end surface of the negative pressure pipe is connected to the external negative pressure exhaust device through a hose; a strip suction nozzle is provided on the lower end surface of the negative pressure pipe, which is tightly pressed against the outer side surface of the bottom umbrella plate separator; a gear 2 is provided on the upper end of the outer side surface of the negative pressure pipe; a gear 1 is connected to the output shaft of the motor, which is meshed with a gear 2; a pneumatic telescopic rod is provided inside the sealed box, and the telescopic end of the pneumatic telescopic rod is connected to the upper surface of the lifting plate.

[0009] Preferably, a second annular mounting plate is provided at the lower end of the outer side surface of the liquid collecting tank, and a mounting hole is provided on the second annular mounting plate.

[0010] Preferably, an annular mounting plate 1 is provided at the lower end of the outer side surface of the cylindrical barrel, and the annular mounting plate 1 is sealed and mounted on the upper surface of the liquid collecting tank by bolts.

[0011] Preferably, the lower end of the cylindrical body is open, and the lower end of the cylindrical body is located above the liquid discharge port.

[0012] Preferably, the number of the guide pipes is not less than one, and the at least one guide pipe is evenly distributed in an annular shape on the outer side surface of the annular diversion pipe.

[0013] Preferably, the number of the top umbrella board separators is not less than one, and the outer sides of the top umbrella board separators and the bottom umbrella board separators are both covered with micropores.

[0014] Preferably, the maintenance cover plate and the mounting plate are both connected to the outer side surface of the PVC plate through an annular sealing ring.

[0015] Preferably, an anti-foaming net is provided inside the reducer.

[0016] Preferably, the outer side surface of the sealing box body is connected to a cylindrical feed nozzle arranged on the outer side surface of the conical cylinder through a flexible suction tube, and the cylindrical feed nozzle is arranged tangent to the outer side surface of the conical cylinder.

[0017] Preferably, a filter screen is provided at the upper end of the inner side surface of the conical cylinder, a suction nozzle is installed on the upper end surface of the conical cylinder, the suction nozzle is connected to the external negative pressure gas collecting tank, and the lower end surface of the conical cylinder is connected to a closed waste collection barrel.

[0018] Compared with the prior art, the beneficial effects of this application are: 1. This multiphase flow gas-liquid separation and treatment device can clean the solid impurities on the surface of the umbrella plate separator in real time, effectively ensuring the smoothness of the umbrella plate separator mesh, and at the same time ensuring the working efficiency of the gas-liquid separator. When the pressure inside the gas-liquid separation and treatment device is too high, the safety structure will break first to relieve the pressure on the tank body, thereby avoiding the occurrence of serious accidents; 2. Hydrocarbon gas with high water content enters the interior of the annular diverter pipe through the tapered gradient pipe, and finally enters the interior of the cylindrical barrel through the guide pipe on the outer surface of the annular diverter pipe. Water droplets flow through the bottom umbrella plate separator under the action of gravity, and the gas contained in the water droplets rises after being precipitated through the mesh of the bottom umbrella plate separator. The water vapor contained in the rising gas re-condenses into water droplets on the top umbrella plate separator. The water droplets fall into the liquid collecting pool under the action of gravity and are finally discharged through the drain port on the outer side of the liquid collecting pool. 3. When cleaning the solid particles accumulated on the upper surface of the bottom umbrella plate separator, first press the strip suction nozzle tightly against the upper surface of the bottom umbrella plate separator, then start the negative pressure suction device to draw the inside of the negative pressure tube into a negative pressure state, then the motor drives the negative pressure tube to rotate through the gear transmission device, and the negative pressure tube drives the strip suction nozzle to rotate along the upper surface of the bottom umbrella plate separator, and the strip suction nozzle sucks the particles blocked in the mesh into the inside of the negative pressure tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of this application; Figure 2 This is the main view of this application; Figure 3 This is a schematic diagram of the internal structure of the present application when connected to a waste collection device; Figure 4 for Figure 3 A partial enlarged schematic diagram in the middle.

[0020] In the figure: 1 conical gradient tube, 2 annular diverter tube, 3 cylindrical barrel, 4 discharge port, 5 electric control valve 1, 6 flow sensor, 7 maintenance cover, 8 sealing box, 9 handle, 10 safety through hole, 11 electric control valve 2, 12 air outlet pipe, 13 mounting plate, 14 guide pipe, 15 PVC plate, 16 annular mounting plate 1, 17 liquid collecting tank, 18 reducer, 19 annular mounting plate 2, 20 negative pressure tube, 21 flexible suction tube, 22 cylindrical feed nozzle, 23 suction nozzle, 24 conical barrel, 25 waste collection bucket, 26 bottom umbrella plate separator, 27 top umbrella plate separator, 28 strip suction nozzle, 29 L-shaped baffle, 30 lifting plate, 31 motor, 32 gear 1, 33 pneumatic telescopic rod, 34 gear 2, 35 anti-foam net. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0022] In the description of this application, if the orientation description is involved, for example, the orientation or position relationship indicated by "upper", "lower", "front", "back", "left", "right", etc. is based on the attached Figure 2 The orientation or position relationship shown is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation of the present application. When a feature is referred to as being "set", "fixed", or "connected" to another feature, it can be directly set, fixed, or connected to the other feature, or it can be indirectly set, fixed, or connected to the other feature.

[0023] See also Figure 1-4 The present application provides the following technical solutions: a multiphase flow gas-liquid separation and treatment device, comprising a liquid collecting tank 17; a drain port 4 is installed on the outer side of the liquid collecting tank 17, and an electric control valve 5 is installed on the drain port 4; a cylindrical barrel 3 is installed on the upper surface of the liquid collecting tank 17, and the cylindrical barrel 3 is connected to an annular diverter pipe 2 through a guide pipe 14 arranged on its outer side; a conical gradient tube 1 is installed on the outer side of the annular diverter pipe 2, and a flow sensor 6 is installed on the conical gradient tube 1; an L-shaped baffle 29 is provided on the inner side of the cylindrical barrel 3 near the guide pipe 14, and a top umbrella plate separator 27 and a bottom umbrella plate separator 26 are provided on the inner side of the cylindrical barrel 3 from top to bottom, and the L-shaped baffle 29 is arranged between the top umbrella plate separator 27 and the bottom umbrella plate separator 26.

[0024] Specifically, hydrocarbon gas with a higher water content enters the interior of the annular diverter pipe 2 through the conical gradient tube 1, and finally enters the interior of the cylindrical barrel 3 through the guide pipe 14 on the outer surface of the annular diverter pipe 2. Water droplets flow through the bottom umbrella plate separator 26 under the action of gravity, and the gas contained in the water droplets rises after precipitating through the mesh of the bottom umbrella plate separator 26. The water vapor in the rising gas condenses into water droplets on the top umbrella plate separator 27 again, and the water droplets fall into the liquid collecting pool 17 under the action of gravity, and are finally discharged through the drain port 4 on the outer side of the liquid collecting pool 17.

[0025] The upper end surface of the cylindrical barrel 3 is provided with a reducer 18, and the upper end surface of the reducer 18 is provided with a mounting plate 13. The upper end surface of the mounting plate 13 is sealed and connected to a maintenance cover 7 by bolts. A PVC plate 15 is provided between the maintenance cover 7 and the mounting plate 13. The upper surface of the maintenance cover 7 is provided with at least one safety through hole 10.

[0026] Specifically, when the pressure inside the cylindrical barrel 3 exceeds the design value, the PVC board 15 is first ruptured, and the gas is depressurized through the safety through hole 10. A whistle device is installed inside the safety through hole 10. When the airflow passes through at high speed, the whistle device makes a sound to remind the staff.

[0027] An air outlet pipe 12 is provided on the outer side surface of the reducer 18, and an electric-controlled valve 2 11 is installed on it. A sealed box 8 is installed on the upper surface of the maintenance cover 7. A lifting plate 30 is slidably connected to the inside of the sealed box 8. A negative pressure pipe 20 and a motor 31 are provided on the upper surface of the lifting plate 30. The upper end surface of the negative pressure pipe 20 is connected to an external negative pressure exhaust device through a hose. A strip suction nozzle 28 is provided on the lower end surface of the negative pressure pipe 20. The strip suction nozzle 28 is pressed tightly against the outer side surface of the bottom umbrella plate separator 26. A gear 2 34 is provided on the upper end of the outer side surface of the negative pressure pipe 20. The output shaft of the motor 31 is connected to a gear 1 32, and the gear 1 32 is meshed with the gear 2 34. A pneumatic telescopic rod 33 is provided inside the sealed box 8, and the telescopic end of the pneumatic telescopic rod 33 is connected to the upper surface of the lifting plate 30.

[0028] Specifically, when cleaning the solid particles accumulated in the mesh of the bottom umbrella plate separator 26, first, the strip suction nozzle 28 is pressed tightly against the upper surface of the bottom umbrella plate separator 26, and then the negative pressure suction device is started to draw the inside of the negative pressure tube 20 into a negative pressure state, and then the motor 31 drives the negative pressure tube 20 to rotate through the gear transmission device, and the negative pressure tube 20 drives the strip suction nozzle 28 to rotate along the upper surface of the bottom umbrella plate separator 26, and the strip suction nozzle 28 sucks the particles blocked in the mesh into the inside of the negative pressure tube 20.

[0029] Furthermore, in order to improve the cleaning efficiency, it is necessary to clean the solid particles on the upper surface of the bottom umbrella plate separator 26 in time. At this time, the pneumatic telescopic rod 33 is extended and retracted to drive the negative pressure tube 20 to move upward. The negative pressure tube 20 is rotatably connected to the lifting plate 30 through a bearing. The lifting plate 30 drives the negative pressure tube 20 to move slightly upward. At this time, the strip suction nozzle 28 can clean the upper surface of the bottom umbrella plate separator 26 when rotating.

[0030] Furthermore, a second annular mounting plate 19 is provided at the lower end of the outer side surface of the liquid collecting pool 17 , and a mounting hole is provided on the second annular mounting plate 19 .

[0031] Furthermore, an annular mounting plate 16 is provided at the lower end of the outer side surface of the cylindrical barrel 3, and the annular mounting plate 16 is sealed and mounted on the upper surface of the liquid collecting tank 17 by bolts.

[0032] Furthermore, the lower end of the cylindrical body 3 is open, and the lower end of the cylindrical body 3 is located above the drain port 4 .

[0033] Specifically, such an arrangement can effectively prevent gas from overflowing through the lower end of the cylindrical barrel 3 .

[0034] Furthermore, the number of the guide pipe 14 is not less than one, and the guide pipe 14 is not less than one and is evenly distributed on the outer side of the annular diverter pipe 2 .

[0035] Specifically, the number of the flow guide pipes 14 is four.

[0036] Furthermore, the number of the top umbrella board separator 27 is not less than one, and the outer side surfaces of the top umbrella board separator 27 and the bottom umbrella board separator 26 are both covered with micropores.

[0037] Specifically, the number of the top parachute panel separators 27 is two.

[0038] Furthermore, the maintenance cover plate 7 and the mounting plate 13 are both connected to the outer side surface of the PVC plate 15 through an annular sealing ring.

[0039] Furthermore, an anti-foaming net 35 is provided inside the reducer 18 .

[0040] Specifically, the anti-foam net 35 is a wire net used to eliminate or capture mist droplets and liquid foam in the gas.

[0041] Furthermore, the outer side surface of the sealing box body 8 is connected to the cylindrical feed nozzle 22 arranged on the outer side surface of the conical cylinder 24 through a flexible suction tube 21, and the cylindrical feed nozzle 22 is arranged tangent to the outer side surface of the conical cylinder 24.

[0042] Furthermore, a filter screen is provided at the upper end of the inner side surface of the conical cylinder 24, a suction nozzle 23 is installed on the upper end surface of the conical cylinder 24, the suction nozzle 23 is connected to the external negative pressure gas collecting tank, and a closed waste collection barrel 25 is connected to the lower end surface of the conical cylinder 24.

[0043] Specifically, a solenoid valve is provided on the flexible suction tube 21, which will only be opened when in use. When the flexible suction tube 21 is in use, the gas-liquid mixture spirals into the interior of the conical cylinder 24 through the cylindrical feed nozzle 22, and the solids in the gas-liquid mixture spiral downward under the combined action of gravity and centrifugal force until they enter the interior of the waste collection barrel 25, and the gas is discharged into the collection tank through the suction nozzle 23.

[0044] During use: hydrocarbon gas with a high water content in the conical cylinder 24 enters the interior of the annular diverter pipe 2 through the conical gradient pipe 1, and finally enters the interior of the cylindrical cylinder 3 through the guide pipe 14 on the outer surface of the annular diverter pipe 2, and water droplets flow through the bottom umbrella plate separator 26 under the action of gravity, and the gas contained in the water droplets rises after being precipitated through the mesh of the bottom umbrella plate separator 26, and the water vapor in the rising gas re-condenses into water droplets on the top umbrella plate separator 27, and the water droplets fall into the liquid collecting pool 17 under the action of gravity, and are finally discharged through the drain port 4 on the outer side of the liquid collecting pool 17, and the gas is discharged through the outlet pipe 12.

[0045] When cleaning the solid particles accumulated in the mesh of the bottom umbrella plate separator 26, first, the strip suction nozzle 28 is pressed tightly against the upper surface of the bottom umbrella plate separator 26, and then the negative pressure suction device is started to draw the inside of the negative pressure tube 20 into a negative pressure state, and then the motor 31 drives the negative pressure tube 20 to rotate through the gear transmission device, and the negative pressure tube 20 drives the strip suction nozzle 28 to rotate along the upper surface of the bottom umbrella plate separator 26, and the strip suction nozzle 28 sucks the particles blocked in the mesh into the inside of the negative pressure tube 20.

[0046] In order to improve the cleaning efficiency, it is necessary to clean the solid particles on the upper surface of the bottom umbrella plate separator 26 in time. At this time, the pneumatic telescopic rod 33 is extended and retracted to drive the negative pressure tube 20 to move upward. The negative pressure tube 20 is rotatably connected to the lifting plate 30 through a bearing. The lifting plate 30 drives the negative pressure tube 20 to move slightly upward. At this time, the strip suction nozzle 28 can clean the upper surface of the bottom umbrella plate separator 26 when rotating.

[0047] The gas-liquid mixture inside the negative pressure tube 20 spirals into the interior of the conical cylinder 24 through the cylindrical feed nozzle 22, and the solids in the gas-liquid mixture spiral downward under the combined action of gravity and centrifugal force until they enter the interior of the waste collection barrel 25, and the gas is discharged into the collection tank through the suction nozzle 23.

[0048] It is worth noting that the input ends of the electric control valve 1 5 , the flow sensor 6 , the electric control valve 2 11 , the motor 31 and the pneumatic telescopic rod 33 are all electrically connected to the output end of the external power supply through the external control switch.

[0049] Although the embodiments of the present application have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A multiphase flow gas-liquid separation and treatment device, characterized in that: The invention comprises a liquid collecting pool (17); a liquid discharge port (4) is installed on the outer side of the liquid collecting pool (17); an electric control valve (5) is installed on the liquid discharge port (4); a cylindrical body (3) is installed on the upper surface of the liquid collecting pool (17); the cylindrical body (3) is connected to an annular flow dividing pipe (2) via a flow guiding pipe (14) arranged on the outer side of the cylindrical body (3); a conical gradient pipe (1) is installed on the outer side of the annular flow dividing pipe (2); a flow sensor (6) is installed on the conical gradient pipe (1); an L-shaped baffle (29) is provided on the inner side of the cylindrical body (3) near the flow guiding pipe (14); a top umbrella plate separator (27) and a bottom umbrella plate separator (26) are provided on the inner side of the cylindrical body (3) in order from top to bottom; and the L-shaped baffle (29) is arranged between the top umbrella plate separator (27) and the bottom umbrella plate separator (26); The upper end surface of the cylindrical body (3) is provided with a reducer (18), the upper end surface of the reducer (18) is provided with a mounting plate (13), the upper end surface of the mounting plate (13) is sealed with a maintenance cover plate (7) via bolts, a PVC plate (15) is provided between the maintenance cover plate (7) and the mounting plate (13), and the upper surface of the maintenance cover plate (7) is provided with at least one safety through hole (10); An air outlet pipe (12) is provided on the outer side of the reducer (18), on which an electric control valve 2 (11) is installed. A sealing box (8) is installed on the upper surface of the maintenance cover (7). A lifting plate (30) is slidably connected inside the sealing box (8). A negative pressure pipe (20) and a motor (31) are provided on the upper surface of the lifting plate (30). The upper end surface of the negative pressure pipe (20) is connected to an external negative pressure suction device through a hose. A strip suction nozzle (28) is provided on the lower end surface of the negative pressure pipe (20). The strip suction nozzle (28) is pressed tightly against the outer side surface of the bottom umbrella plate separator (26). A second gear (34) is provided on the upper end of the outer side surface of the negative pressure pipe (20). The output shaft of the motor (31) is connected to a first gear (32). The first gear (32) meshes with the second gear (34). A pneumatic telescopic rod (33) is provided inside the sealing box (8). The telescopic end of the pneumatic telescopic rod (33) is connected to the upper surface of the lifting plate (30).

2. A multiphase flow gas-liquid separation and treatment device according to claim 1, characterized in that: A second annular mounting plate (19) is provided at the lower end of the outer side surface of the liquid collecting tank (17), and a mounting hole is provided on the second annular mounting plate (19).

3. A multiphase flow gas-liquid separation and treatment device according to claim 1, characterized in that: An annular mounting plate 1 (16) is provided at the lower end of the outer side surface of the cylindrical barrel (3), and the annular mounting plate 1 (16) is sealed and mounted on the upper surface of the liquid collecting tank (17) by means of bolts.

4. A multiphase flow gas-liquid separation and treatment device according to claim 1, characterized in that: The lower end of the cylindrical body (3) is open, and the lower end of the cylindrical body (3) is located above the liquid discharge port (4).

5. The multiphase flow gas-liquid separation and treatment device according to claim 1, characterized in that: The number of the flow guide pipe (14) is not less than one, and the not less than one flow guide pipe (14) is evenly distributed in an annular manner on the outer side surface of the annular flow diversion pipe (2).

6. The multiphase flow gas-liquid separation and treatment device according to claim 1, characterized in that: The number of the top umbrella plate separator (27) is not less than one, and the outer sides of the top umbrella plate separator (27) and the bottom umbrella plate separator (26) are both covered with micropores.

7. The multiphase flow gas-liquid separation and treatment device according to claim 1, characterized in that: The maintenance cover plate (7) and the mounting plate (13) are both connected to the outer side surface of the PVC plate (15) via an annular sealing ring.

8. The multiphase flow gas-liquid separation and treatment device according to claim 1, characterized in that: An anti-foam net (35) is provided inside the reducer (18).

9. The multiphase flow gas-liquid separation and treatment device according to claim 1, characterized in that: The outer side surface of the sealing box body (8) is connected to a columnar feed nozzle (22) arranged on the outer side surface of the conical cylinder body (24) through a flexible suction tube (21), and the columnar feed nozzle (22) is arranged tangent to the outer side surface of the conical cylinder body (24).

10. A multiphase flow gas-liquid separation and treatment device according to claim 9, characterized in that: A filter screen is provided at the upper end of the inner side surface of the conical cylinder (24); a suction nozzle (23) is installed on the upper end surface of the conical cylinder (24); the suction nozzle (23) is connected to an external negative pressure gas collecting tank; and a sealed waste collection bucket (25) is connected to the lower end surface of the conical cylinder (24).

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