GB2061748A - Liquid-solid separators - Google Patents
Liquid-solid separators Download PDFInfo
- Publication number
- GB2061748A GB2061748A GB8030880A GB8030880A GB2061748A GB 2061748 A GB2061748 A GB 2061748A GB 8030880 A GB8030880 A GB 8030880A GB 8030880 A GB8030880 A GB 8030880A GB 2061748 A GB2061748 A GB 2061748A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tank
- liquid
- separator
- holding tank
- solids
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000007787 solid Substances 0.000 title claims abstract description 31
- 239000007788 liquid Substances 0.000 claims abstract description 8
- 238000005192 partition Methods 0.000 claims description 3
- 239000002002 slurry Substances 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000005520 cutting process Methods 0.000 description 4
- 230000005587 bubbling Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000011343 solid material Substances 0.000 description 2
- 241000237858 Gastropoda Species 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- GOLXNESZZPUPJE-UHFFFAOYSA-N spiromesifen Chemical compound CC1=CC(C)=CC(C)=C1C(C(O1)=O)=C(OC(=O)CC(C)(C)C)C11CCCC1 GOLXNESZZPUPJE-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/01—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/88—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices
- B01D29/90—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices for feeding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/88—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices
- B01D29/94—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices for discharging the filter cake, e.g. chutes
- B01D29/945—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices for discharging the filter cake, e.g. chutes for continuously discharging concentrated liquid
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2201/00—Details relating to filtering apparatus
- B01D2201/16—Valves
- B01D2201/165—Multi-way valves
Landscapes
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Chemical & Material Sciences (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Sludge (AREA)
Abstract
A liquid-solid separator for separating solids from solids-containing liquids delivered to the separator in surges with entrained air is provided. The separator comprises a vibrating separator screen 1, a holding tank 4 to which the delivery is made through a fitting 3, an overflow weir opening 10 in the side of the holding tank, through which the solids-containing liquid is delivered to the separator screen 1, and a surge receiving tank 11 mounted on the holding tank directly above the overflow weir opening 10. There may be a plurality of the separator screens 1, each associated with a separate overflow weir opening 10 in the side of a single holding tank 4, in which case a separate surge receiving tank 11 is provided for each overflow weir opening 10. The surge receiving tank(s) 11 is or are preferably divided by baffles 12. <IMAGE>
Description
SPECIFICATION
Liquid-solid separators
The invention relates to apparatus for control of surges in liquid-solid slurries being delivered to a vibrating screen solids separator.
More particularly, the invention is concerned with avoiding pollution problems which arise from surges being delivered to the screen of the separator.
When a hole or shaft is drilled into the earth it is common to remove the cuttings in a fluid. For example, when a shaft is drilled into the ocean bottom, the cuttings produced by the drill string can be brought to the surface in a stream of sea water through a "blooie line". In most parts of the world the discharge from the blooie line is dumped into the ocean and the solids are allowed to settle to the ocean bottom. In the United States environmental regulations forbid such a practice. Instead, the driller is required to screen the slurry from the blooie line to provide for separation of solids from the water, and to transport the solids to land for disposal.
In the drilling of some shafts into the ocean bottom, an air lift was used to lift cuttings, sand and water in the blooie line to the surface. The slurry was delivered at the top of the drill string to a "Rumba" solids separator as supplied by Hutchison-Hayes International,
Inc. In the intended operation of the separator the slurry is delivered to a mud holding tank having one or more weirs through which overflow from the tank is intended to pass onto the separator screens. The tank is generally enclosed but one or more doors are provided for access, clean-out and the like.
The air lift was operated by introducing quantities of compressed air into the blooie line at the bottom of the drill stand thereby reducing the effective density in the blooie line and causing an upward movement of water and solids. Because of the air lift, there is a tendency to develop surges with clumps of air bubbles at irregular intervals. Those surges were found to produce sudden and heavy discharges from the mud holding tank, causing over loading of the screens and, in some cases, blowing open the mud holding tank doors. The result was to cause unacceptable discharge of solids into the ocean.
In an effort to overcome the problem, cylindrical surge tanks were fitted to the top of the mud holding tank. While the surge tanks were of some benefit in reducing the magnitude of the problem, they did not overcome the problem of discharging unacceptable quantities of solids back into the ocean.
The invention provides a liquid-solid separator comprising a separator screen, holding tank connected to a source of solids-containing liquid delivered in surges with entrained air and positioned to distribute said liquid to the separator screen through an opening in the side of the holding tank, and a surge receiving tank mounted on the holding tank directly above the opening in the side of the holding tank.
There may be, in a solid-liquid separator according to the invention a plurality of the separator screens, an opening in the side of the holding tank for each separator screen, and a surge receiving tank for each opening in the side of the holding tank, each surge receiving tank being mounted on the holding tank directly above the opening with which it is associated. The or each surge receiving tank is preferably a cylindrical tank, desirably divided into a plurality of compartments by vertically disposed baffles or partitions. Air passages at the top of each baffle may connect the compartments. The invention is illustrated by the drawings, of which:
Figure 1 is a side elevation of the primary screen of a conventional vibrating screen liquid-solid separator showing a surge device according to the invention.
Figure 2 is a side elevation view of the surge device of Fig. 1 viewed from the liquidsolid delivery side;
Figure 3 is a side elevation view of the surge device of Fig. 1 viewed from the separator side;
Figure 4 is a sectional view taken along line
IV-IV of Fig. 3; and
Figure 5 is a sectional view taken along line
V-V of Fig. 3.
A conventional solids separator, such as a
Hutchison-Hayes Rumba 102 Solids Separator, comprises a pair of primary screens 1 onto which a liquid-slurry is delivered for primary separation. The screens are mounted on a frame 2 for the separator, only a part of which is shown in the drawings. A liquid-solid slurry is delivered from the blooie line at the fitting 3 in the bottom of a mud holding tank 4. Struts 5 are welded to the outside wall of the tank 4 adjacent to the fitting 3 to stiffen the panel against varying hydraulic pressures within the tank 4. A top plate 6 in the tank 4 is provided with a door 7 for access for cleaning and the like. A bypass door 8 is provided in the bottom of the tank 4 opposite to the fitting 3.When the door 8 is opened the liquid-solid material delivered through the fitting 3 bypasses the primary screen 1 and goes directly to a secondary holding tank, not shown in the drawings. A panel 9 of the tank 4 is on the side adjacent to the screens 1.
Two weirs 10 are formed in the top of the panel 9.
A cylindrical surge tank 11 is positioned on the top of the mud handling tank 4 above each weir 9. A segment of each tank 11 is removed by a plane extending through the top plate 6 of the tank 4. The top plate 6 is removed where it intersects with the tank 11 so that there is access between the tank 4 and each of the tanks 11 to the full width of the tank 4.
A series of baffles 12 are positioned within each tank 11 by welding. Baffles 12 are arranged vertically parallel dividing each surge tank 11 into a plurality of compartments 13 of substantially equal volume. A gap 14 is provided at the top of each baffle 12 and allows air to move freely between the compartments 1 3.
In the intended operation liquid-solid material will enter the tank 4 through the fitting 3 at a steady rate. If the bypass door 8 is closed, the slurry level in the tank will rise until it overflows the tank 4 through weirs 10.
The slurry will then be deposited across the width of the screens 1 uniformly and evenly, each weir 10 depositing material on to one of the screens.
In actual operation, using an air lift in the blooie line, the slurry of water, cuttings and water is discharged through the fitting 3 with irregular and uncontrolled surges accompanied by bursting or decay of the air bubbles which have provided the air lift. The result is a bubbling and surging in the mud holding tank 4. Prior to the installation of the tanks 11, the bubbling and surging was sufficient to cause the mud holding tank doors to open and also to deliver slugs of material over the weirs 10. As a result unacceptable quantities of solids were carried back into the ocean.
The installation of the tanks 11 and the fittings of baffles 12 within the tanks 11 prevents uncontrolled surging. Instead, surges are controlled and the result is that the separator acts in the desired manner to separate solids from liquid without loss of unacceptable amounts of solids into the water.
Claims (6)
1. A liquid-solid separator comprising a separator screen, a holding tank connected to a source of solids-containing liquid delivered in surges with entrained air and positioned to distribute said liquid to the separator screen through an opening in the side of the holding tank, and a surge receiving tank mounted on the holding tank directly above the opening in the side of the holding tank.
2. A liquid-solid separator according to claim 1 in which there is a plurality of the separator screens, an opening in the side of the holding tank for each separator screen, and a surge receiving tank for each opening in the side of the holding tank, each surge receiving tank being mounted on the holding tank directly above the opening with which it is associated.
3. A liquid-solid separator according to either preceding claim in which the or each surge receiving tank is cylindrical tank mounted on a horizontal axis.
4. A liquid-solid separator according to any preceding claim in which the or each surge receiving tank is divded into separate compartments by a plurality of vertically extending partitions.
5. A liquid-solid separator according to claim 4 in which air passages are provided between the tops of the compartments formed within the tanks by the partitions.
6. A liquid-solid separator substantially as described herein with reference to the drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US8862879A | 1979-10-26 | 1979-10-26 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2061748A true GB2061748A (en) | 1981-05-20 |
| GB2061748B GB2061748B (en) | 1983-05-18 |
Family
ID=22212467
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8030880A Expired GB2061748B (en) | 1979-10-26 | 1980-09-25 | Liquid-solid separators |
Country Status (2)
| Country | Link |
|---|---|
| AU (1) | AU539656B2 (en) |
| GB (1) | GB2061748B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4626349A (en) * | 1984-03-21 | 1986-12-02 | Westfalia Separator Ag | Device for separating solids from liquids |
| US5531889A (en) * | 1994-03-08 | 1996-07-02 | Atotech Usa, Inc. | Method and apparatus for removing resist particles from stripping solutions for printed wireboards |
-
1980
- 1980-09-25 GB GB8030880A patent/GB2061748B/en not_active Expired
- 1980-10-24 AU AU63669/80A patent/AU539656B2/en not_active Ceased
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4626349A (en) * | 1984-03-21 | 1986-12-02 | Westfalia Separator Ag | Device for separating solids from liquids |
| US5531889A (en) * | 1994-03-08 | 1996-07-02 | Atotech Usa, Inc. | Method and apparatus for removing resist particles from stripping solutions for printed wireboards |
| US5599444A (en) * | 1994-03-08 | 1997-02-04 | Atotech Usa, Inc. | Apparatus for removing resist particles from stripping solutions for printed wireboards |
| EP0749347B1 (en) * | 1994-03-08 | 1998-06-10 | Atotech Deutschland Gmbh | Processes and devices for removing coating layers from printed circuit boards |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2061748B (en) | 1983-05-18 |
| AU6366980A (en) | 1981-04-30 |
| AU539656B2 (en) | 1984-10-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19920925 |