CA1326572C - Injector apparatus - Google Patents
Injector apparatusInfo
- Publication number
- CA1326572C CA1326572C CA000558129A CA558129A CA1326572C CA 1326572 C CA1326572 C CA 1326572C CA 000558129 A CA000558129 A CA 000558129A CA 558129 A CA558129 A CA 558129A CA 1326572 C CA1326572 C CA 1326572C
- Authority
- CA
- Canada
- Prior art keywords
- conduit means
- baffle
- fluid
- air supply
- flotation apparatus
- 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.)
- Expired - Fee Related
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/14—Flotation machines
- B03D1/1412—Flotation machines with baffles, e.g. at the wall for redirecting settling solids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
- B03D1/00—Flotation
- B03D1/14—Flotation machines
- B03D1/24—Pneumatic
- B03D1/247—Mixing gas and slurry in a device separate from the flotation tank, i.e. reactor-separator type
Abstract
ABSTRACT OF THE DISCLOSURE
An injector for use in a flotation apparatus is provided.
The injector includes a cylindrical conduit having an inlet for receiving a fluid at one end. the conduit includes a substantially vertical section extending into a flotation tank located in the flotation apparatus and is provided with an outlet for discharging the fluid into the tank. A baffle having bores provided therethrough is disposed in the conduit upstream from an air supply to churn the fluid before it is aerated by the air supply, thereby enhancing bubble generation in the fluid before it is discharged into the flotation apparatus.
An injector for use in a flotation apparatus is provided.
The injector includes a cylindrical conduit having an inlet for receiving a fluid at one end. the conduit includes a substantially vertical section extending into a flotation tank located in the flotation apparatus and is provided with an outlet for discharging the fluid into the tank. A baffle having bores provided therethrough is disposed in the conduit upstream from an air supply to churn the fluid before it is aerated by the air supply, thereby enhancing bubble generation in the fluid before it is discharged into the flotation apparatus.
Description
The present invention relates to an injector apparatus and in particular to an injector for use in a flotation apparatus.
In a typical flotation apparatus, it is necessary to design the in~ector so that it is capabla of raceiving and aerating a large quantity of fluid to provide a good distrlbution of aerated suspension when the fluid is dischargad into the flotation tank. However, in conventional *lotation apparatus', the in;ectors do not sol~e this requirement adequately.
Accordingly, there is a need for an improved injector for use in a flotation apparatus.
It is an object of the present invention to obviate or mitigate the above disadvantage.
According to the present invention there is provided an injector for use in a flotation apparatus comprising:
a conduit means having an inlet for receiving a fluid flow and an outlet positioned in said flotation apparatus for discharging said flow therein;
an air supply means for supplying air into said conduit means to aerate said fluid; and a baffle disposed in said conduit means upstream from said air supply means, said baffle churning said fluid prior to being aerated to ensure sufficient bubble generation in said fluid.
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, Pref~rably, the conduit means is a cylindrical feed pipe including a substantially vertical section extending into the flotation apparatus and the baffle comprises a cylindrical plate having a plurality of bores of circular cross-section provided therethrough. It is also preferred that the bores are symmetrically distributed on the plate.
Preferably, the air supply means comprises an air feed line connected at one end to an air supply and connected at the other end to the feed pipe via air intake slots formed in the feed pipe. It is also preferred that the air intake slots are positioned downstream from the baffle a distance between one-eighth to one-half the diameter of the feed pipe.
It is also preferred that the feed pipe has a diameter of at least 160mm and that the langth thereof extending from the baffle to the outlet is three to five times its diameter at the -~
air intake slots location.
The provision of the baffle in the feed pipa upstream from the air supply means ensures that the fluid is sufficiently churned prior to being asrated, thereby enhancing bubble generation in the fluid and improving the flotation and distribution of solid matter in the fluid when supplied to the flotation apparatus.
.
' ",.
Embodiments of the present invention wi:Ll now be described by way of example only with reference to -the accompanying drawings in which:
Figure 1 is a sectional view of an injector used in a flotation apparatus;
Figure 2 is a view of a portion of the device illustrated in Figure 1 taken along line 2-2; and Figure 3 ls a sectional view of another injector used in a flotation apparatus.
Referring to Figures 1 and 2, an injector 10 is shown for use in a flo-tation apparatus 12. The in~ector includes a cylindrical feed pipe 14 having an inlet 16 at one end for receiving a fluid containing solid matter therein and preferably having a diameter of at least 160mm. The feed pipe 1~ is curved and terminates in a substantially vertical section 18 extending into a flotation tank 20. An outlet 22 forming a radial diffuser 24 is located at the other end of the feed pipe 14 and provides a substantially horizontal fluid discharge path for the fluid into the flotation tank 20.
A cylindrical baffle 26 is disposed in the vertical section 18 of the feed pipe 14 above the flo-tation tank 20. Tha baffle 26 is provided with a plurality of bores 28 of circular cross-section, the bores 28 being symmetrically and radially disposed about the centre of the baffle.
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Air intake slots 30 are formed in the vertical section 18 of the feed pipe 14 downstream from the baffle 26 and receive air from an air supply (not shown~ via an air feed line 32. The air intake slots 30 are preferably positioned a Idistance A ranging from about one-eighth to one-half the diameter D of the feed pipe 14 downstream from the baffle 26. Chokes 34 are provided on the air feed line 32 to limit the amount of air supplied to the air intake slots 32 and hence, effect air regulation of the fluid.
The length B of the vertical section 18 extending from the baffle 26 to the outlet 22 is preferably two and one-half to four times the diame-ter D of the feed pipe 14 at the location of the air intaka slots 30.
A second baffle 36 having a diameter E equal to approximately one and three-quarters times the diameter D of the feed pipe 14 is positioned at the bottom of the radial diffuser.
The outer ends 38 of the diffuser 24 extend radially outwardly to form a cylindrical discharge outlet having a diamster F
preferably equal to two and a one-half times the diameter D.
In operation, the inlet 16 is supplied with the fluid having solid matter therein that is to be aerated and fed to the flotation apparatus 12 by way of the feed pipe 14. The fluid is forced through the feed pipe 14 into the vertical section 18 wherein it flows against the baffle 26. The baffle 26 regulates the flow of the fluid in the feed pipe 14 and effects proper ' : '.' : ; , ' ~ :.,. - --. :
churning thereof due to the symmatrical bores 28. The air supply (not shown) supplies air into the feed pipe L4 downstream from the baffle 26 via the air feed line 32 and a:ir intake slots 34.
Thus, the fluid is aerated before being conveyed to the outlet 22. At the outlet, the fluid flows against the lower baffle 36 and is further churned before being dischar~ed via outlets 38 of the radial diffuser 24 into the flotation tank 20.
Since the fluid is well churned by the baffle 26 and since the air intake slots 30 are provided proximally downstream therefrom, the injector 10 ensures that the fluid is sufficiently aerated prior to being supplied to the flotation apparatus to enhance bubble generation in the fluid. This results in improved flotation and distribution of the solid matter in the fluid when the fluid is discharged into the flotation tank 20.
Referring to Figure 3, another embodiment of the in~ector 10' is shown. In this figure, like reference numerals will be used to indicate like components with a ' added for clarity. The vertical section 18' of the feed pipe 14' extending from the air intake slots 30' to the outlet 22' is divided into upper and lower portions 40 and 42, each portion being substantially equal in length. The portion 40 is circular in cross-section having a diameter D' and includes the baf~le 26' and the air intake slots 30' which are positioned and function in ths same manner as the previous embodiment. The lower portion 42, however, is conical . .
in shape having a steadily increasing diameter in a direction towards the radial diffuser 2~'. The conical dimension of the lower portion A2 enhances churning of the fluid prior to being discharged into the flotation tank 20', thereby removing the need for the lower baffle 36.
Although the present device has baan described using a baffle having bores of circular cross-section, it should be apparent that various numbers of differently shaped and sized bores can be provided through the baffle 26.
- , . ,~, . . , , .,: , ' : :
.: ~ , ' ~
In a typical flotation apparatus, it is necessary to design the in~ector so that it is capabla of raceiving and aerating a large quantity of fluid to provide a good distrlbution of aerated suspension when the fluid is dischargad into the flotation tank. However, in conventional *lotation apparatus', the in;ectors do not sol~e this requirement adequately.
Accordingly, there is a need for an improved injector for use in a flotation apparatus.
It is an object of the present invention to obviate or mitigate the above disadvantage.
According to the present invention there is provided an injector for use in a flotation apparatus comprising:
a conduit means having an inlet for receiving a fluid flow and an outlet positioned in said flotation apparatus for discharging said flow therein;
an air supply means for supplying air into said conduit means to aerate said fluid; and a baffle disposed in said conduit means upstream from said air supply means, said baffle churning said fluid prior to being aerated to ensure sufficient bubble generation in said fluid.
~k ~
~: .
, ,, ~ ~ :
~, .
, Pref~rably, the conduit means is a cylindrical feed pipe including a substantially vertical section extending into the flotation apparatus and the baffle comprises a cylindrical plate having a plurality of bores of circular cross-section provided therethrough. It is also preferred that the bores are symmetrically distributed on the plate.
Preferably, the air supply means comprises an air feed line connected at one end to an air supply and connected at the other end to the feed pipe via air intake slots formed in the feed pipe. It is also preferred that the air intake slots are positioned downstream from the baffle a distance between one-eighth to one-half the diameter of the feed pipe.
It is also preferred that the feed pipe has a diameter of at least 160mm and that the langth thereof extending from the baffle to the outlet is three to five times its diameter at the -~
air intake slots location.
The provision of the baffle in the feed pipa upstream from the air supply means ensures that the fluid is sufficiently churned prior to being asrated, thereby enhancing bubble generation in the fluid and improving the flotation and distribution of solid matter in the fluid when supplied to the flotation apparatus.
.
' ",.
Embodiments of the present invention wi:Ll now be described by way of example only with reference to -the accompanying drawings in which:
Figure 1 is a sectional view of an injector used in a flotation apparatus;
Figure 2 is a view of a portion of the device illustrated in Figure 1 taken along line 2-2; and Figure 3 ls a sectional view of another injector used in a flotation apparatus.
Referring to Figures 1 and 2, an injector 10 is shown for use in a flo-tation apparatus 12. The in~ector includes a cylindrical feed pipe 14 having an inlet 16 at one end for receiving a fluid containing solid matter therein and preferably having a diameter of at least 160mm. The feed pipe 1~ is curved and terminates in a substantially vertical section 18 extending into a flotation tank 20. An outlet 22 forming a radial diffuser 24 is located at the other end of the feed pipe 14 and provides a substantially horizontal fluid discharge path for the fluid into the flotation tank 20.
A cylindrical baffle 26 is disposed in the vertical section 18 of the feed pipe 14 above the flo-tation tank 20. Tha baffle 26 is provided with a plurality of bores 28 of circular cross-section, the bores 28 being symmetrically and radially disposed about the centre of the baffle.
, ': ' : ' " ~ ', 1 32657~
Air intake slots 30 are formed in the vertical section 18 of the feed pipe 14 downstream from the baffle 26 and receive air from an air supply (not shown~ via an air feed line 32. The air intake slots 30 are preferably positioned a Idistance A ranging from about one-eighth to one-half the diameter D of the feed pipe 14 downstream from the baffle 26. Chokes 34 are provided on the air feed line 32 to limit the amount of air supplied to the air intake slots 32 and hence, effect air regulation of the fluid.
The length B of the vertical section 18 extending from the baffle 26 to the outlet 22 is preferably two and one-half to four times the diame-ter D of the feed pipe 14 at the location of the air intaka slots 30.
A second baffle 36 having a diameter E equal to approximately one and three-quarters times the diameter D of the feed pipe 14 is positioned at the bottom of the radial diffuser.
The outer ends 38 of the diffuser 24 extend radially outwardly to form a cylindrical discharge outlet having a diamster F
preferably equal to two and a one-half times the diameter D.
In operation, the inlet 16 is supplied with the fluid having solid matter therein that is to be aerated and fed to the flotation apparatus 12 by way of the feed pipe 14. The fluid is forced through the feed pipe 14 into the vertical section 18 wherein it flows against the baffle 26. The baffle 26 regulates the flow of the fluid in the feed pipe 14 and effects proper ' : '.' : ; , ' ~ :.,. - --. :
churning thereof due to the symmatrical bores 28. The air supply (not shown) supplies air into the feed pipe L4 downstream from the baffle 26 via the air feed line 32 and a:ir intake slots 34.
Thus, the fluid is aerated before being conveyed to the outlet 22. At the outlet, the fluid flows against the lower baffle 36 and is further churned before being dischar~ed via outlets 38 of the radial diffuser 24 into the flotation tank 20.
Since the fluid is well churned by the baffle 26 and since the air intake slots 30 are provided proximally downstream therefrom, the injector 10 ensures that the fluid is sufficiently aerated prior to being supplied to the flotation apparatus to enhance bubble generation in the fluid. This results in improved flotation and distribution of the solid matter in the fluid when the fluid is discharged into the flotation tank 20.
Referring to Figure 3, another embodiment of the in~ector 10' is shown. In this figure, like reference numerals will be used to indicate like components with a ' added for clarity. The vertical section 18' of the feed pipe 14' extending from the air intake slots 30' to the outlet 22' is divided into upper and lower portions 40 and 42, each portion being substantially equal in length. The portion 40 is circular in cross-section having a diameter D' and includes the baf~le 26' and the air intake slots 30' which are positioned and function in ths same manner as the previous embodiment. The lower portion 42, however, is conical . .
in shape having a steadily increasing diameter in a direction towards the radial diffuser 2~'. The conical dimension of the lower portion A2 enhances churning of the fluid prior to being discharged into the flotation tank 20', thereby removing the need for the lower baffle 36.
Although the present device has baan described using a baffle having bores of circular cross-section, it should be apparent that various numbers of differently shaped and sized bores can be provided through the baffle 26.
- , . ,~, . . , , .,: , ' : :
.: ~ , ' ~
Claims (4)
1. An injector for use in a flotation apparatus comprising:
a conduit means having an inlet for receiving a pressurized fluid flow and an outlet positioned in said flotation apparatus for discharging said fluid therein;
an air supply means for supplying air into said conduit means substantially transverse to the direction of said fluid flow to aerate said fluid; and a baffle disposed in said conduit means upstream from said air supply means, said baffle comprising a plate of circular cross-section having a plurality of bores provided therethrough and disposed radially and symmetrically from the center of said plate, said baffle churning said fluid prior to being aerated to ensure sufficient bubble generation in said fluid.
a conduit means having an inlet for receiving a pressurized fluid flow and an outlet positioned in said flotation apparatus for discharging said fluid therein;
an air supply means for supplying air into said conduit means substantially transverse to the direction of said fluid flow to aerate said fluid; and a baffle disposed in said conduit means upstream from said air supply means, said baffle comprising a plate of circular cross-section having a plurality of bores provided therethrough and disposed radially and symmetrically from the center of said plate, said baffle churning said fluid prior to being aerated to ensure sufficient bubble generation in said fluid.
2. An injector as defined in claim 1 wherein said conduit means is a cylindrical feed pipe having a substantially vertical section extending into said flotation apparatus.
3. An injector as defined in claim 1 wherein said air supply means includes air intake slots provided in said conduit means downstream from said baffle; and an air supply line connected at one end to said slots and at the other end to an air supply.
4. An injector as defined in claim 3 wherein said conduit means is a cylindrical feed pipe and said air intake slots are positioned from said baffle a distance ranging from about 0.2 to 0.5 times the diameter of said conduit means.5. An injector as defined in claim 2 or 4 wherein said cylindrical pipe has a diameter of at least 160mm.
6. An injector as defined in claim 4 wherein the length of said conduit means extending from said baffle to said outlet ranges from about 3 to 5 times the diameter of said conduit means.
7. An injector apparatus as defined in claim 1 or 3 wherein said air supply means further includes a regulation means for regulating the flow of air into said conduit means.
8. A flotation apparatus comprising:
a flotation tank for separating solid matter floating on the surface of a fluid;
a conduit means having an inlet for receiving a pressurized fluid flow and an outlet positioned in said flotation tank for discharging said fluid therein;
an air supply means having an inlet for receiving a pressurized fluid flow substantially transverse to the direction of said fluid flow to aerate said fluid; and a baffle disposed in said conduit means upstream from said air supply means, said baffle comprising a plate of circular cross-section having a plurality of bores provided therethrough and disposed radially and symmetrically from the center of said plate, said baffle churning said fluid prior to being aerate to ensure sufficient bubble generation in said fluid.
9. A flotation apparatus as defined in claim 8 wherein said conduit means is a cylindrical feed pipe having a substantially vertical section extending into said flotation apparatus.
10. A flotation apparatus as defined in claim 8 wherein said air supply means includes air intake slots provided in said conduit means downstream from said baffle; and an air supply line connected at one end to said slots and at the other end to an air supply.
11. A flotation apparatus as defined in claim 10 wherein said conduit means is a cylindrical feed pipe and said air intake slots are positioned from said baffle a distance ranging from about 0.2 to 0.5 times the diameter of said conduit means.
12. A flotation apparatus as defined in claim 9 or 11 wherein said cylindrical pipe has a diameter of at least 160mm.
13. A flotation apparatus as defined in claim 11 wherein the length of said conduit means extending from said baffle to said outlet ranges from about 3 to 5times the diameter of said conduit means.
14. A flotation apparatus as defined in claim 8 or 10 wherein said air supply means further includes a regulation means for regulating the flow of air into said conduit means.
6. An injector as defined in claim 4 wherein the length of said conduit means extending from said baffle to said outlet ranges from about 3 to 5 times the diameter of said conduit means.
7. An injector apparatus as defined in claim 1 or 3 wherein said air supply means further includes a regulation means for regulating the flow of air into said conduit means.
8. A flotation apparatus comprising:
a flotation tank for separating solid matter floating on the surface of a fluid;
a conduit means having an inlet for receiving a pressurized fluid flow and an outlet positioned in said flotation tank for discharging said fluid therein;
an air supply means having an inlet for receiving a pressurized fluid flow substantially transverse to the direction of said fluid flow to aerate said fluid; and a baffle disposed in said conduit means upstream from said air supply means, said baffle comprising a plate of circular cross-section having a plurality of bores provided therethrough and disposed radially and symmetrically from the center of said plate, said baffle churning said fluid prior to being aerate to ensure sufficient bubble generation in said fluid.
9. A flotation apparatus as defined in claim 8 wherein said conduit means is a cylindrical feed pipe having a substantially vertical section extending into said flotation apparatus.
10. A flotation apparatus as defined in claim 8 wherein said air supply means includes air intake slots provided in said conduit means downstream from said baffle; and an air supply line connected at one end to said slots and at the other end to an air supply.
11. A flotation apparatus as defined in claim 10 wherein said conduit means is a cylindrical feed pipe and said air intake slots are positioned from said baffle a distance ranging from about 0.2 to 0.5 times the diameter of said conduit means.
12. A flotation apparatus as defined in claim 9 or 11 wherein said cylindrical pipe has a diameter of at least 160mm.
13. A flotation apparatus as defined in claim 11 wherein the length of said conduit means extending from said baffle to said outlet ranges from about 3 to 5times the diameter of said conduit means.
14. A flotation apparatus as defined in claim 8 or 10 wherein said air supply means further includes a regulation means for regulating the flow of air into said conduit means.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE8701636U DE8701636U1 (en) | 1987-02-04 | 1987-02-04 | |
| DEG8701636.2 | 1987-02-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1326572C true CA1326572C (en) | 1994-01-25 |
Family
ID=6804296
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000558129A Expired - Fee Related CA1326572C (en) | 1987-02-04 | 1988-02-04 | Injector apparatus |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0277327B1 (en) |
| AT (1) | ATE86532T1 (en) |
| CA (1) | CA1326572C (en) |
| DE (2) | DE8701636U1 (en) |
| ES (1) | ES2039420T3 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4309918C2 (en) * | 1993-03-26 | 1994-09-15 | Voith Gmbh J M | Flotation cell with an injector |
| DE102009011046A1 (en) * | 2009-02-28 | 2010-09-02 | Voith Patent Gmbh | Flotation device for removal of extraneous material from aqueous pulp suspension, has flow divider dividing stream of pulp suspension into multiple partial streams at short section, where partial streams are unified in flow divider |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR663974A (en) * | 1928-11-15 | 1929-08-28 | Apparatus for the preparation of carbo-gas baths by commercial carbonic acid and the preparation of any continuous dissolution of a gas in a suitable liquid | |
| US2252076A (en) * | 1939-10-31 | 1941-08-12 | Standard Oil Dev Co | Fluid mixer |
| DE3144386C2 (en) * | 1981-11-07 | 1983-12-29 | J.M. Voith Gmbh, 7920 Heidenheim | Injector flotation apparatus |
| DE3614933C1 (en) * | 1986-05-02 | 1987-10-22 | Voith Gmbh J M | Flotation tank or cell |
-
1987
- 1987-02-04 DE DE8701636U patent/DE8701636U1/de not_active Expired
- 1987-12-17 DE DE8787118744T patent/DE3784690D1/en not_active Expired - Fee Related
- 1987-12-17 AT AT87118744T patent/ATE86532T1/en not_active IP Right Cessation
- 1987-12-17 EP EP87118744A patent/EP0277327B1/en not_active Expired - Lifetime
- 1987-12-17 ES ES198787118744T patent/ES2039420T3/en not_active Expired - Lifetime
-
1988
- 1988-02-04 CA CA000558129A patent/CA1326572C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| ES2039420T3 (en) | 1993-10-01 |
| EP0277327A3 (en) | 1990-03-28 |
| ATE86532T1 (en) | 1993-03-15 |
| EP0277327A2 (en) | 1988-08-10 |
| DE8701636U1 (en) | 1987-03-19 |
| EP0277327B1 (en) | 1993-03-10 |
| DE3784690D1 (en) | 1993-04-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |