U.S. patent application number 13/653983 was filed with the patent office on 2013-02-14 for wetted wall venturi scrubber with a 2-stage venturi throat.
This patent application is currently assigned to NATIONAL CHIAO TUNG UNIVERSITY. The applicant listed for this patent is NATIONAL CHIAO TUNG UNIVERSITY. Invention is credited to Chuen-Jinn TSAI.
Application Number | 20130037971 13/653983 |
Document ID | / |
Family ID | 43647087 |
Filed Date | 2013-02-14 |
United States Patent
Application |
20130037971 |
Kind Code |
A1 |
TSAI; Chuen-Jinn |
February 14, 2013 |
WETTED WALL VENTURI SCRUBBER WITH A 2-STAGE VENTURI THROAT
Abstract
A venturi scrubber, which avoids clogging in the throat by dust
particles, includes a venturi tube, two scrubbing fluid conduits
and a scrubbing fluid tank. The venturi tube has a converging
section, a diverging section and a throat section which is
connected between the converging section and the diverging section.
The scrubbing fluid conduit has a top end connected with the bottom
end of the converging section of the venturi tube, and the
scrubbing fluid conduit is connected with the scrubbing fluid tank.
Thereby, scrubbing fluid can be guided directly into the scrubbing
fluid tank without passing through the throat section. As a result,
the clogging of dust particles on the converging section of the
venturi throat can be minimized and the abnormal increase of the
pressure drop of the throat can also be avoided.
Inventors: |
TSAI; Chuen-Jinn; (Zhubei
City, TW) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
NATIONAL CHIAO TUNG UNIVERSITY; |
Hsinchu City |
|
TW |
|
|
Assignee: |
NATIONAL CHIAO TUNG
UNIVERSITY
Hsinchu City
TW
|
Family ID: |
43647087 |
Appl. No.: |
13/653983 |
Filed: |
October 17, 2012 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
12662899 |
May 11, 2010 |
|
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13653983 |
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Current U.S.
Class: |
261/72.1 |
Current CPC
Class: |
B01D 47/021 20130101;
B01D 47/10 20130101 |
Class at
Publication: |
261/72.1 |
International
Class: |
B01D 47/10 20060101
B01D047/10 |
Foreign Application Data
Date |
Code |
Application Number |
Sep 7, 2009 |
TW |
98130125 |
Claims
1. A wetted wall venturi scrubber, comprising: a venturi tube, said
venturi tube comprising a converging section, a diverging section
and a throat connected between said converging section and said
diverging section, said throat comprising a gas inlet, said
diverging section comprising a gas outlet; a conduit, said conduit
having a top end connected with a bottom side of said converging
section and a bottom end; and a storage tank connected with the
bottom end of said conduit; wherein said storage tank stores a
scrubbing fluid; the bottom end of said conduit extends below the
level of said scrubbing fluid in said storage tank.
2. The wetted wall venturi scrubber as claimed in claim 1, further
comprising an atomized sprayer mounted inside said converging
section of said venturi tube.
3. The wetted wall venturi scrubber as claimed in claim 1, further
comprising an overflow gutter connected with said converging
section of said venturi tube.
4. The wetted wall venturi scrubber as claimed in claim 1, wherein
said throat of said venturi tube has a boundary wall extended to
the inside of said converging section.
5. The wetted wall venturi scrubber as claimed in claim 1, wherein
said venturi tube and said conduit are formed of an outer tube and
an inner tube; said converging section of said venturi tube and
said conduit are formed in said outer tube; said throat and said
diverging section of said venturi tube are formed in said inner
tube; said outer tube comprises a through hole for the insertion of
one end of said inner tube.
Description
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This patent application is a division of U.S. patent
application Ser. No. 12/662,899 filed May 11, 2010 entitled "Wetted
Wall Venturi Scrubber with A 2-Stage Venturi Throat", the entire
disclosure of which is incorporated herein by reference.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The present invention relates to air pollution control
equipment and more particularly, to a wetted wall venturi scrubber
with a 2-stage venturi throat, which avoids clogging in the throat
by dust particles.
[0004] 2. Description of the Related Art
[0005] For the advantage of excellent particle removal efficiency,
venturi scrubber has been intensively used in the industry. A
regular venturi scrubber, as disclosed in 2005 in J. Air &
Waste Manage. Assoc. by Tsai et al, generally comprises a
converging section, a diverging section and a throat. The throat is
formed between the converging section and the diverging section.
During application, waste gas to be treated with scrubbing fluid
droplets are guided into the converging section and, as the area
decreases, gas velocity increases. The inlet gas shears the
scrubbing fluid droplets subject to a velocity difference between
the inlet gas and the scrubbing fluid droplets Particle and gas
removal occur in the throat section as the inlet gas stream mixes
with the scrubbing fluid droplets.
[0006] When waste gas having a high particle concentration is
introduced into the venturi scrubber, the particles tend to be
adhered to the inside wall of the converging section. Accumulation
of particles in the converging section results in throat clogging,
thereby causing operation instability and abnormal increase of
pressure drop. Further, the aforesaid prior art venturi scrubber
has a special shape, complicating the fabrication process.
SUMMARY OF THE INVENTION
[0007] The present invention has been accomplished under the
circumstances in view. It is the main object of the present
invention to provide a wetted wall venturi scrubber with a 2-stage
venturi throat, which avoids clogging in the throat by dust
particles.
[0008] It is another object of the present invention to provide a
wetted wall venturi scrubber with a 2-stage venturi throat, which
reduces the manufacturing time, labor and cost.
[0009] To achieve these and other objects of the present invention,
a wetted wall venturi scrubber with a 2-stage venturi throat
comprises a venturi tube, a conduit and a storage tank. The venturi
tube comprises a converging section, a diverging section and a
throat connected between the converging section and the diverging
section. The throat comprises a gas inlet. The diverging section
comprises a gas outlet. The conduit has its top end connected with
the bottom side of the converging section. The storage tank is
connected with the bottom end of the conduit.
[0010] Further, the storage tank stores a scrubbing fluid. The
bottom end of the conduit extends below the level of the scrubbing
fluid in the storage tank. The wetted wall venturi scrubber further
comprises an atomized sprayer mounted inside the converging section
of the venturi tube, an overflow gutter connected with the
converging section of the venturi tube.
[0011] Further, the throat of the venturi tube has a boundary wall
extended to the inside of the converging section.
[0012] Further, the venturi tube and the conduit can be formed of
an outer tube and an inner tube. In this case, the converging
section of the venturi tube and the conduit are formed in the outer
tube; the throat and the diverging section of the venturi tube are
formed in the inner tube; the outer tube comprises a through hole
for the insertion of one end of the inner tube.
[0013] In one embodiment of the present invention, the venturi tube
further comprises a bushing sleeved onto the inner tube and
disposed inside the outer tube. Further, the bushing and the outer
tube defining therebetween a scrubbing fluid inlet passage. The
inner tube of the venturi tube comprises a plurality of jet nozzles
disposed in communication with the inside of the inner tube and the
scrubbing fluid inlet passage. Further, the inner tube of the
venturi tube comprises a rib extending around the periphery thereof
and abutted against the bottom side of the bushing. Further, the
conduit is connected with the outer tube by a dock, and the inner
tube is mounted on the dock. Further, the converging section has a
tubular shape. The venturi tube comprises a wall-cleaning scrubbing
fluid supply pipe connected with the top side of the converging
section. The wall-cleaning scrubbing fluid supply pipe extends
along the converging section in the tangential direction.
BRIEF DESCRIPTION OF THE DRAWINGS
[0014] FIG. 1 is an elevational view of a wetted wall venturi
scrubber with a 2-stage venturi throat in accordance with a first
embodiment of the present invention.
[0015] FIG. 2 is an exploded view of the wetted wall venturi
scrubber with a 2-stage venturi throat in accordance with the first
embodiment of the present invention.
[0016] FIG. 3 is a sectional view of the wetted wall venturi
scrubber with a 2-stage venturi throat in accordance with the first
embodiment of the present invention.
[0017] FIG. 4 is an elevational view of a wetted wall venturi
scrubber with a 2-stage venturi throat in accordance with a second
embodiment of the present invention.
[0018] FIG. 5 is a sectional view of the wetted wall venturi
scrubber with a 2-stage venturi throat in accordance with the
second embodiment of the present invention.
[0019] FIG. 6 is a sectional view of the venturi tube of the wetted
wall venturi scrubber with a 2-stage venturi throat in accordance
with the second embodiment of the present invention.
[0020] FIG. 7 is an exploded view of the venturi tube and conduits
of the venturi tube of the wetted wall venturi scrubber with a
2-stage venturi throat in accordance with the second embodiment of
the present invention.
DETAILED DESCRIPTION OF THE INVENTION
[0021] Referring to FIGS. 1-3, a wetted wall venturi scrubber with
a 2-stage venturi throat 10 in accordance with a first embodiment
of the present invention is shown comprising a venturi tube 20, two
scrubbing fluid conduits 30, a scrubbing fluid tank 40, an atomized
sprayer 50 and two overflow gutters 60.
[0022] The venturi tube 20 comprises a converging section 22, a
diverging section 24 and a throat 26. The throat 26 is connected
between the converging section 22 and the diverging section 24 with
its boundary wall extended to the inside of the converging section
22. The converging section 22 has a gas inlet 221 formed in its one
end remote from the throat 26. The diverging section 24 has a gas
outlet 241 formed in its one end remote from the throat 26.
[0023] The two scrubbing fluid conduits 30 each have a top end 32
connected with the bottom side of the converging section 22 of the
venturi tube 20, and a bottom end 34 connected with the scrubbing
fluid tank 40.
[0024] During fabrication, connecting an outer tube 201 and an
inner tube 203 forms the venturi tube 20 and the two scrubbing
fluid conduits 30. The converging section 22 of the venturi tube 20
and the two scrubbing fluid conduits 30 are formed in the outer
tube 201. The throat 26 and diverging section 24 of the venturi
tube 20 are formed in the inner tube 203. The outer tube 201 has a
through hole 205 for the passing of the top end of the inner tube
203.
[0025] The scrubbing fluid tank 40 is connected with the bottom
side of the outer tube 201 to collect the scrubbing fluid. The two
scrubbing fluid conduits 30 extend below the fluid level of the
scrubbing fluid, avoiding passing of the waste gas through the two
scrubbing fluid conduits 30 directly without scrubbing. The inside
space of the scrubbing fluid tank 40 is kept in communication with
the diverging section 24 of the venturi tube 20. The scrubbing
fluid tank 40 has an exhaust hole 44 and a scrubbing fluid outlet
46 respectively disposed in the top and bottom sides.
[0026] The atomized sprayer 50 is mounted inside the converging
section 22 of the venturi tube 20 to spray a fine mist of scrubbing
fluid droplets.
[0027] The two overflow gutters 60 are formed by affixing two
connectors 62 to the outside of the converging section 22, each
having an opening 64 kept in communication with the inside of the
converging section 22 of the venturi tube 20.
[0028] The venturi tube 10 is adapted to remove dust particles from
the waste gas by means of the scrubbing fluid. The scrubbing fluid
is introduced into the venturi tube 20 through the atomized sprayer
50. When the user draws air out of the scrubbing fluid tank 40
through the exhaust hole 44, the waste gas to be treated is guided
through the gas inlet 221 into the converging section 22.
Thereafter, the mist of fine mist of scrubbing fluid droplets
generated by the atomized sprayer 50 is mixed with the waste gas to
flow into the throat 26, thereby causing dust particles to be
removed from the waste gas. The purified gas is drawn through the
inside of the scrubbing fluid tank 40 and the exhaust hole 44 to
the outside. After passing through the throat 26 and diverging
section 24 of the venturi tube 20, the scrubbing fluid flows into
the scrubbing fluid tank 40.
[0029] Further, the scrubbing fluid in the scrubbing fluid tank 40
is guided through a circulating piping (not shown) and two
wall-cleaning scrubbing fluid supply pipes 66 to the two overflow
gutters 60 where the scrubbing fluid flows over the gutters 60 into
the converging section 22 of the venturi tube 20 to wet its inside
wall, avoiding adhesion and accumulation of dust particles. The
overflowing scrubbing fluid flows along the scrubbing fluid
conduits 30 back to the scrubbing fluid tank 40.
[0030] When flowing along the inside wall of the converging section
22, the overflowing scrubbing fluid carries adhered dust particles
away from the inside wall of the converging section 22, avoiding
clogging in the throat 26. Further, the scrubbing fluid for wetting
the inside wall of the converging section 22 is directly guided
back to the scrubbing fluid tank 40 by the scrubbing fluid conduits
30. Actually, only the fine mist of scrubbing fluid droplets
generated by the atomized sprayer 50 is guided through the throat
26. Therefore, the invention avoids clogging in the throat 26 by
dust particles due to passing of an over amount of the scrubbing
fluid and abnormal pressure drop caused by clogging.
[0031] Further, as stated above, connecting an outer tube 201 with
an inner tube 203 forms the venturi tube 20 and the scrubbing fluid
conduits 30. So far as the configuration is concerned, the outer
tube 201 and the inner tube 203 can be made much easier than a
conventional venturi tube, saving much manufacturing time, labor
and cost. Further, the boundary wall of the throat 26 of the
venturi tube 20 extends to the inside of the converging section 22,
facilitating flowing of the scrubbing fluid along the inside wall
of the converging section 22 into the scrubbing fluid conduits
30.
[0032] Based on the spirit of the present invention, the structure
of the venturi tube may be variously embodied. FIGS. 4-7 illustrate
a wetted wall venturi scrubber with a 2-stage venturi throat 70 in
accordance with a second embodiment of the present invention.
Substantially similar to the aforesaid first embodiment, the wetted
wall venturi scrubber with a 2-stage venturi throat 70 in
accordance with this second embodiment comprises a venturi tube 80,
two scrubbing fluid conduits 90 and a scrubbing fluid tank 94.
[0033] The venturi tube 80 is formed by connecting an outer tube
82, an inner tube 84, a bushing 86, a wall-cleaning scrubbing fluid
supply pipe 87 and a dust particle scrubbing fluid supply pipe 88
with one another. The outer tube 82 is a cylindrical tube defining
a converging section 82. Further, the outer tube 82 has a hole 821
near the top side of the converging section 82 for the insertion of
the wall-cleaning scrubbing fluid supply pipe 87. The wall-cleaning
scrubbing fluid supply pipe 87 extends along the tangential
direction so that the scrubbing fluid slows spirally through the
converging section 82. The outer tube 82 further has a through hole
822 on the bottom side for the insertion of the inner tube 84. The
inner tube 84 defines a throat 841 and a diverging section 843.
Further, the inner tube 84 has a rib 845 extending around the
periphery. The throat 841 has a plurality of jet nozzles 847 on the
top side. The bushing 86 is sleeved onto the inner tube 84 and
disposed inside the outer tube 82, defining with the outer tube 82
a scrubbing fluid inlet passage 861 that communicates with the
outside through the dust particle scrubbing fluid supply pipe 88
and the inside of the inner tube 84 through the jet nozzles 847.
The bottom side of the bushing 86 is abutted against the rib 845 of
the inner tube 84.
[0034] The two scrubbing fluid conduits 90 are connected to the
outer tube 82 by a dock 92. The inner tube 84 is fixedly mounted on
the dock 92.
[0035] The scrubbing fluid 941 is the scrubbing fluid tank 94 is
guided through a circulation piping (not shown) and the
wall-cleaning scrubbing fluid supply pipe 87 into the converging
section 82 of the venturi tube 80 to wet the inside wall of the
converging section 82. Thereafter, the scrubbing fluid flows
through a scrubbing fluid outlet passage 823 between the outer tube
82 and the bushing 86 into the inside of the dock 92, and then
through the scrubbing fluid conduits 90 into the scrubbing fluid
tank 94. Further, the scrubbing fluid after purification is guided
through the dust particle scrubbing fluid supply pipe 88, the
scrubbing fluid inlet passage 861 and the jet nozzles 847 into the
throat 841 to remove dust particles from the waste gas.
[0036] Although particular embodiments of the invention have been
described in detail for purposes of illustration, various
modifications and enhancements may be made without departing from
the spirit and scope of the invention. Accordingly, the invention
is not to be limited except as by the appended claims.
* * * * *