CN115095289A - Coal water separation equipment and separation method - Google Patents
Coal water separation equipment and separation method Download PDFInfo
- Publication number
- CN115095289A CN115095289A CN202210723086.5A CN202210723086A CN115095289A CN 115095289 A CN115095289 A CN 115095289A CN 202210723086 A CN202210723086 A CN 202210723086A CN 115095289 A CN115095289 A CN 115095289A
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- section
- box body
- screen
- water
- coal
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/06—Arrangements for treating drilling fluids outside the borehole
- E21B21/063—Arrangements for treating drilling fluids outside the borehole by separating components
- E21B21/065—Separating solids from drilling fluids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D36/00—Filter circuits or combinations of filters with other separating devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D36/00—Filter circuits or combinations of filters with other separating devices
- B01D36/04—Combinations of filters with settling tanks
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D3/00—Axial-flow pumps
- F04D3/02—Axial-flow pumps of screw type
Abstract
The invention discloses coal water separation equipment which comprises a separation device accommodating box body and a power device box body, wherein a differential transmission device is arranged at the middle section of a rotating section of a screen mesh, so that differential rotation angular velocity is generated between the screen mesh and a screw transmission shaft, a mixture is driven to rotate and centrifuge, and the dehydration rate is greatly improved; the screen is arranged to be conical at the rear section of the rotating section of the screen, and under the pushing action of the spiral propelling fan blades and the extrusion action of the end covers, the mixture is subjected to larger polycondensation extrusion action, so that higher dehydration rate and dehydration efficiency are realized; a separation step: the screen mesh fixing section is subjected to gravity settling dehydration; performing centrifugal separation and gravity settling on a large-diameter section of a screen of the rotating section to perform dehydration; the small diameter section of the screen of the rotating section is subjected to polycondensation, extrusion and dehydration; and after the cover plate is extruded and dehydrated, the mixture enters a collection bin. The device and the method can continuously and efficiently separate coal water, have good dehydration effect and high efficiency, and improve the efficiency and the safety of underground punching operation.
Description
Technical Field
The invention relates to coal water separation equipment and a separation method, and belongs to the technical field of coal mine safety.
Background
During the hydraulic punching operation, because the coal body has low mechanical strength, large gas content and high initial desorption speed, a large amount of coal, water and gas mixture is formed in the hole, and the hole spraying phenomenon is easily caused. The normal operation of punching operation is influenced to the coal water mixture that spouts, still very easily causes the injury to personnel and equipment, has increased the danger of water conservancy punching operation, probably leads to the gas loss in addition, causes gas accident hidden danger. Therefore, the safe and reasonable discharge of the multiphase mixture generated by punching is important for solving the problems of drilling and spraying holes and improving the safety and the efficiency of hydraulic punching.
At present, most coal water separation methods adopted in underground coal mines are gravity sedimentation or simple screen filtering, the problems of poor separation effect, low efficiency and the like exist, corresponding separation work cannot be completed in time when the flow of mixed coal water flow is large, punching work cannot be carried out in time, drilling and punching work are directly influenced, and even adverse effects are caused to construction and production work of corresponding areas of mines.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the coal water separation equipment and the coal water separation method, which can continuously and efficiently separate coal water, have good dehydration effect and high efficiency, and improve the efficiency and the safety of underground punching operation.
In order to achieve the purpose, the invention provides coal water separation equipment which comprises a separation device accommodating box body and a power device box body, wherein a screw transmission shaft horizontally arranged along the length direction of the separation device accommodating box body is arranged in the separation device accommodating box body; the front end surface of the accommodating box body of the separating device and the rear end surface of the box body of the power device are of mutually communicated opening structures;
the separating device accommodating box body is internally provided with a screen, the screen and the screw transmission shaft are coaxially arranged, the separating device accommodating box body is sequentially divided into a fixed section and a rotating section from the front end face to the rear end plate of the separating device accommodating box body, the rotating section comprises a cylindrical large-diameter section and a conical small-diameter section, the fixed section is a cylindrical screen section which is arranged in an equal-diameter mode with the cylindrical large-diameter section, the front end of the fixed section is fixedly connected with the front end face of the separating device accommodating box body, the rear end of the fixed section is connected with the front end of the rotating section through a large-diameter bearing, and the rear end of the rotating section is rotatably connected to the rear end plate of the separating device accommodating box body through a bearing;
the power motor in the power device box body is also connected with one end of a differential transmission device through a transmission shaft, and the other end of the differential transmission device is in transmission connection with the rotating section screen;
a spiral propelling fan blade is arranged in a cavity between the screw transmission shaft and the screen, the spiral propelling fan blade is spirally distributed on the outer circumference of the screw transmission shaft along the length direction of the screw transmission shaft, and the diameter of the spiral propelling fan blade is slightly smaller than that of the screen at the section where the spiral propelling fan blade is positioned;
a discharge through hole is arranged on the rear end plate of the accommodating box body of the separating device, and a cover plate is covered on the discharge through hole; the opening position of the discharging through hole falls in the range covered by the tail part of the conical small-diameter section;
a feed inlet communicated with the cavity of the rotating section is formed in the upper end plate of the accommodating box body of the separating device above the fixed section; the lower end plate of the separation device accommodating box body is provided with a plurality of water drainage through holes along the length direction.
Furthermore, a filter screen is arranged between the lower end plate and the screen of the accommodating box body of the separating device, the aperture of the mesh of the filter screen is smaller than that of the mesh of the screen, the filter screen is embedded in the accommodating box body of the separating device, and a cavity between the filter screen and the lower end plate forms a bottom water sump.
Further, the feed inlet top is equipped with the feeding storehouse, the feeding storehouse is hourglass hopper-shaped.
A method for coal water separation comprises the following steps:
the method comprises the following steps: injecting a coal-water mixture into the fixed section of the screen through the feed port, primarily separating partial water from coal under the action of gravity sedimentation, and discharging the water out of the accommodating box body of the separation device through the screen; starting a power motor, rotating a screw transmission shaft, and then driving a spiral type propelling fan blade to rotate so as to push the primarily dehydrated coal-water mixture to the next section; the removed water is discharged out of the accommodating box body of the separating device through the water discharging through hole;
step two: the primarily dewatered coal-water mixture enters a cylindrical large-diameter section in a rotating section of a screen, a differential transmission device is started, the screen in the rotating section rotates anticlockwise in a direction opposite to the rotating direction of a screw transmission shaft, the coal-water mixture is subjected to double effects of centrifugal separation and gravity settling at the moment to further remove moisture in the coal-water mixture, and the coal-water mixture subjected to secondary dewatering is continuously pushed to the next section under the drive of a spiral pushing fan blade; the removed water is discharged out of the accommodating box body of the separating device through the water discharging through hole;
step three: the coal-water mixture after the secondary dehydration enters a conical small-diameter section in the rotating section, and a large amount of residual water in the mixture is removed under the action of the thrust force and the polycondensation extrusion force of a screw transmission shaft of the coal-water mixture; the removed water is discharged out of the accommodating box body of the separating device through the water discharge through hole;
step four: the coal-water mixture after the three times of dehydration is continuously accumulated in the conical small-diameter section, and under the pressure action of the cover plate, the water in the coal-water mixture is further squeezed, removed and discharged; when the amount of the mixture reaches the tolerance limit of the cover plate, the end cover is pushed open, and the mixture enters the collection bin.
Furthermore, the rotating direction of the rotating section screen is opposite to that of the screw transmission shaft, the rotating speed of the rotating section screen is higher than that of the screw transmission shaft, the rotating speed of the rotating section screen is 200-600 rpm, and the rotating speed of the screw transmission shaft is 20-50 rpm.
The invention realizes the high-efficiency and rapid separation of the coal-water mixture by combining various separation methods of rotary centrifugation, gravity removal and polycondensation extrusion. The middle section of the rotating section of the screen is provided with a differential transmission device, so that differential rotation angular velocity is generated between the screen and a screw transmission shaft, a mixture is driven to rotate and centrifuge, and the dehydration rate is greatly improved; the screen is arranged to be conical at the rear section of the rotating section of the screen, and under the pushing action of the spiral propelling fan blades and the squeezing action of the end covers, the mixture is subjected to a large polycondensation squeezing action, so that higher dehydration rate and dehydration efficiency are realized, and the comprehensive dehydration rate is up to more than 98%; the water collecting and draining device is arranged at the bottom of the accommodating box body of the separating device, and the coal collecting device is arranged at the tail of the accommodating box body, so that the collection and the metering of products are facilitated. The invention avoids the problems of poor separation effect, insufficient dehydration and inconvenient collection of the traditional separation method, realizes the continuous and efficient coal water separation of the punching waste liquid, improves the efficiency and safety of the underground punching operation, is beneficial to the classification treatment and the cyclic utilization of waste materials and waste liquid, and has higher practical value and environmental protection value.
Drawings
FIG. 1 is a schematic view of the construction of a coal-water separation apparatus according to the present invention;
FIG. 2 is a schematic view of the structure of the receiving box of the separating apparatus of the present invention;
FIG. 3 is a flow chart of the operation of the coal water separation method of the present invention.
In the figure: 1. the separating device comprises a containing box body, 2, a power device box body, 3, a screw transmission shaft, 4, a rear end plate, 5, a screen, 6, a fixed section, 7, a rotating section, 8, a large-diameter section, 9, a small-diameter section, 10, a transmission shaft, 11, a differential transmission device, 12, a spiral type propelling fan blade, 13, a cover plate, 14, an upper end plate, 15, a lower end plate, 16, a drainage through hole, 17, a filter screen, 18 and a feeding bin.
Detailed Description
The invention will be further explained with reference to the drawings.
As shown in fig. 1 and 2, a coal water separation device comprises a separation device accommodating box body 1 and a power device box body 2, wherein a screw transmission shaft 3 horizontally arranged along the length direction of the separation device accommodating box body 1 is arranged inside the separation device accommodating box body 1, the tail part of the screw transmission shaft 3 is rotatably connected to a rear end plate 4 of the separation device accommodating box body 1 through a bearing, and the front end of the screw transmission shaft 3 extends out of the front end surface of the separation device accommodating box body 1 and is connected with a power motor in the power device box body 2 through a gear transmission structure; the front end surface of the separation device accommodating box body 1 and the rear end surface of the power device box body are of mutually communicated opening structures;
the separation device accommodating box body 1 is internally provided with a screen 5, the screen 5 is coaxially arranged with the screw transmission shaft 3, the separation device accommodating box body 1 is sequentially divided into a fixed section 6 and a rotating section 7 from the front end face to the rear end plate 4, the rotating section 7 comprises a cylindrical large-diameter section 8 and a conical small-diameter section 9, the fixed section 6 is a cylindrical screen section which is arranged in an equal diameter way with the cylindrical large-diameter section 8, the front end of the fixed section is fixedly connected with the front end face of the separation device accommodating box body 1, the rear end of the fixed section is connected with the front end of the rotating section 7 through a large-diameter bearing, and the rear end of the rotating section 7 is rotatably connected onto the rear end plate 4 of the separation device accommodating box body 1 through a bearing;
the power motor in the power device box body 2 is also connected with one end of a differential transmission device 11 through a transmission shaft 10, and the other end of the differential transmission device 11 is in transmission connection with the screen of the rotating section 7;
a spiral propelling fan blade 12 is arranged in a cavity between the screw transmission shaft 3 and the screen 5, the spiral propelling fan blade 12 is spirally distributed on the outer circumference of the screw transmission shaft 3 along the length direction of the screw transmission shaft 3, and the diameter of the spiral propelling fan blade is slightly smaller than that of the screen at the section where the spiral propelling fan blade is located;
a discharge through hole is arranged on the rear end plate of the accommodating box body 1 of the separating device, and a cover plate 13 is covered on the discharge through hole; the opening position of the discharging through hole is positioned in the range covered by the tail part of the conical small-diameter section 9;
a feed inlet communicated with the cavity of the rotating section 7 is formed in an upper end plate 14 of the separation device accommodating box body 1 above the fixed section 6; the lower end plate 15 of the separator accommodating case 1 is provided with a plurality of drain through holes 16 along the longitudinal direction thereof.
In order to further improve the coal water separation effect, a filter screen 17 with a mesh aperture smaller than that of the screen mesh is arranged between the lower end plate of the separation device containing box body and the screen mesh, the filter screen 17 is embedded in the separation device containing box body 1, and a bottom water sump is formed by a cavity between the filter screen 17 and the lower end plate 15.
In order to improve the feeding speed and prevent the mixture from scattering, a feeding bin 18 is arranged at the top of the feeding hole, and the feeding bin 18 is funnel-shaped.
As shown in fig. 3, a method for separating coal water includes the following steps:
the method comprises the following steps: injecting a coal-water mixture into a fixed section 6 of a screen 5 through a feed port, primarily separating partial water from coal under the action of gravity sedimentation, and discharging the water out of a separation device containing box body 1 through the screen 5; starting a power motor, rotating a screw transmission shaft 3, and then driving a spiral type propelling fan blade 12 to rotate so as to push the primarily dehydrated coal-water mixture to a next section; the removed water is discharged out of the separation device accommodating case 1 through the water discharge through hole 16;
step two: the primarily dehydrated coal-water mixture enters a cylindrical large-diameter section 8 in a rotating section 7 of a screen 5, a differential transmission device 11 is started, the rotating section screen rotates anticlockwise in a direction opposite to the rotating direction of a screw transmission shaft 3, the coal-water mixture is subjected to the dual effects of centrifugal separation and gravity settling at the same time, water in the coal-water mixture is further removed, and the coal-water mixture subjected to secondary dehydration is continuously pushed to the next section under the driving of a spiral pushing fan blade 12; the removed water is discharged out of the separation device accommodating box body 1 through the water discharge through hole 16;
step three: the coal-water mixture after the secondary dehydration enters a conical small-diameter section 9 in the rotating section 7, and a large amount of residual water in the mixture is removed under the action of the thrust and polycondensation extrusion force of the screw transmission shaft 3; the removed water is discharged out of the separation device accommodating case 1 through the water discharge through hole 16;
step four: the coal-water mixture after the three times of dehydration is continuously accumulated in the conical small-diameter section 9, and under the pressure action of the cover plate 13, the water in the coal-water mixture is further squeezed, removed and discharged; when the amount of mixture reaches the limit of the cover 13, the cover is opened and the mixture enters the collection bin.
In order to obtain a larger differential rotation angular velocity to improve the dewatering efficiency, the rotation direction of the screen of the rotation section 7 is opposite to that of the screw transmission shaft 3, the rotation speed of the screen of the rotation section 7 is higher than that of the screw transmission shaft 3, the rotation speed is 200-600 rpm, and the rotation speed of the screw transmission shaft 3 is 20-50 rpm.
Claims (5)
1. The coal water separation equipment is characterized by comprising a separation device accommodating box body (1) and a power device box body (2), wherein a screw transmission shaft (3) horizontally arranged along the length direction of the separation device accommodating box body (1) is arranged in the separation device accommodating box body (1), the tail part of the screw transmission shaft (3) is rotatably connected to a rear end plate (4) of the separation device accommodating box body (1) through a bearing, and the front end of the screw transmission shaft (3) extends out of the front end surface of the separation device accommodating box body (1) and is connected with a power motor in the power device box body (2) through a gear transmission structure; the front end surface of the separation device accommodating box body (1) and the rear end surface of the power device box body (2) are of mutually communicated opening structures;
the separation device containing box is characterized in that a screen (5) is further arranged inside the separation device containing box body (1), the screen (5) and a screw transmission shaft (3) are coaxially arranged, the separation device containing box body (1) is divided into a fixing section (6) and a rotating section (7) from the front end face to the rear end plate (4) in sequence, the rotating section (7) comprises a cylindrical large-diameter section (8) and a conical small-diameter section (9), the fixing section (6) is a cylindrical screen section which is arranged in an equal diameter mode with the cylindrical large-diameter section (8), the front end of the fixing section is fixedly connected with the front end face of the separation device containing box body (1), the rear end of the fixing section is connected with the front end face of the rotating section (7) through a large-diameter bearing, and the rear end of the rotating section (7) is rotatably connected to the rear end plate (4) of the separation device containing box body (1) through a bearing;
a power motor in the power device box body (2) is also connected with one end of a differential transmission device (11) through a transmission shaft (10), and the other end of the differential transmission device (11) is in transmission connection with the rotating section screen;
a spiral propelling fan blade (12) is arranged in a cavity between the screw transmission shaft (3) and the screen (5), the spiral propelling fan blade (12) is spirally distributed on the outer circumference of the screw transmission shaft (3) along the length direction of the screw transmission shaft (3), and the diameter of the spiral propelling fan blade is slightly smaller than that of the screen (5) at the section where the spiral propelling fan blade is located;
a discharge through hole is arranged on a rear end plate (4) of the accommodating box body (1) of the separating device, and a cover plate (13) is covered on the discharge through hole; the opening position of the discharging through hole is positioned in the range covered by the tail part of the conical small-diameter section (9);
a feed inlet communicated with the cavity of the rotating section (7) is formed in an upper end plate (14) of the separating device accommodating box body above the fixed section (6); the lower end plate of the separation device accommodating box body (1) is provided with a plurality of drainage through holes (16) along the length direction.
2. A coal water separation apparatus according to claim 1, characterized in that a filter screen (17) is further provided between the lower end plate (15) of the separation device housing case (1) and the screen (5), the mesh aperture of the filter screen (17) is smaller than that of the screen (5), the filter screen is embedded in the separation device housing case (1), and the cavity between the filter screen and the lower end plate (15) forms a bottom sump.
3. The coal water separation equipment according to claim 1 or 2, characterized in that the top of the feed inlet is provided with a feed bin (18), and the feed bin (18) is funnel-shaped.
4. A method for separating coal water by using the coal water separation apparatus according to any one of claims 1 to 3, comprising the steps of:
the method comprises the following steps: injecting a coal-water mixture into a fixed section (6) of a screen (5) through a feed port, primarily separating partial water from coal under the action of gravity settling, and discharging the water out of a separation device containing box body (1) through the screen (5); starting a power motor, rotating a screw transmission shaft (3), and then driving a spiral type propelling fan blade (12) to rotate so as to push the primarily dehydrated coal-water mixture to the next section; the removed water is discharged out of the accommodating box body (1) of the separating device through a water discharge through hole (16);
step two: the primarily dehydrated coal-water mixture enters a cylindrical large-diameter section (8) in a rotating section (7) of a screen (5), a differential transmission device (11) is started, the rotating section screen rotates anticlockwise in a direction opposite to the rotating direction of a screw transmission shaft (3), the coal-water mixture is subjected to the dual effects of centrifugal separation and gravity settling at the same time, water in the coal-water mixture is further removed, and the coal-water mixture subjected to secondary dehydration is continuously pushed to a lower section under the drive of a spiral pushing fan blade (12); the removed water is discharged out of the accommodating box body (1) of the separating device through a water discharge through hole (16);
step three: the coal-water mixture after secondary dehydration enters a conical small-diameter section (9) in the rotating section (7), and a large amount of residual water in the mixture is removed under the action of the thrust and polycondensation extrusion force of the screw transmission shaft (3) of the coal-water mixture; the removed water is discharged out of the accommodating box body (1) of the separating device through a water discharge through hole (16);
step four: the coal-water mixture after three times of dehydration is continuously accumulated in the conical small-diameter section (9), and under the pressure action of the cover plate (13), the water in the coal-water mixture is further squeezed, removed and discharged; when the amount of the mixture reaches the tolerance limit of the cover plate (13), the end cover is pushed open, and the mixture enters the collection bin.
5. The coal water separation method according to claim 4, characterized in that the rotating section screen and the screw transmission shaft (3) rotate in opposite directions, the rotating speed of the rotating section screen is higher than that of the screw transmission shaft (3) and ranges from 200 rpm to 600rpm, and the rotating speed of the screw transmission shaft (3) ranges from 20 rpm to 50 rpm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210723086.5A CN115095289B (en) | 2022-06-24 | 2022-06-24 | Coal water separation equipment and separation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210723086.5A CN115095289B (en) | 2022-06-24 | 2022-06-24 | Coal water separation equipment and separation method |
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| Publication Number | Publication Date |
|---|---|
| CN115095289A true CN115095289A (en) | 2022-09-23 |
| CN115095289B CN115095289B (en) | 2023-03-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210723086.5A Active CN115095289B (en) | 2022-06-24 | 2022-06-24 | Coal water separation equipment and separation method |
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Citations (7)
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| US6779606B1 (en) * | 2002-10-09 | 2004-08-24 | Perry A. Lopez | Method and apparatus for heating drilling and/or completion fluids entering or leaving a well bore during oil and gas exploration and production |
| CN2875600Y (en) * | 2006-03-29 | 2007-03-07 | 魏志玉 | Screen settling type coal mud centrifugal dewatering machine |
| US20140357464A1 (en) * | 2013-05-30 | 2014-12-04 | National Oilwell Varco, L.P. | Centrifuge |
| CN206454798U (en) * | 2016-12-23 | 2017-09-01 | 刘晓东 | A kind of coal dehydration device |
| CN107288560A (en) * | 2017-07-17 | 2017-10-24 | 长江大学 | A kind of helix transporting device with filtering slurry function |
| CN110102099A (en) * | 2019-06-19 | 2019-08-09 | 中国矿业大学(北京) | Sieve nest, device for separating mud and water and mud-water separation method |
| CN215694861U (en) * | 2021-06-02 | 2022-02-01 | 中国成达工程有限公司 | Horizontal spiral sedimentation centrifuge capable of reducing liquid content of filter cake |
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2022
- 2022-06-24 CN CN202210723086.5A patent/CN115095289B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6779606B1 (en) * | 2002-10-09 | 2004-08-24 | Perry A. Lopez | Method and apparatus for heating drilling and/or completion fluids entering or leaving a well bore during oil and gas exploration and production |
| CN2875600Y (en) * | 2006-03-29 | 2007-03-07 | 魏志玉 | Screen settling type coal mud centrifugal dewatering machine |
| US20140357464A1 (en) * | 2013-05-30 | 2014-12-04 | National Oilwell Varco, L.P. | Centrifuge |
| CN206454798U (en) * | 2016-12-23 | 2017-09-01 | 刘晓东 | A kind of coal dehydration device |
| CN107288560A (en) * | 2017-07-17 | 2017-10-24 | 长江大学 | A kind of helix transporting device with filtering slurry function |
| CN110102099A (en) * | 2019-06-19 | 2019-08-09 | 中国矿业大学(北京) | Sieve nest, device for separating mud and water and mud-water separation method |
| CN215694861U (en) * | 2021-06-02 | 2022-02-01 | 中国成达工程有限公司 | Horizontal spiral sedimentation centrifuge capable of reducing liquid content of filter cake |
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| CN115095289B (en) | 2023-03-24 |
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