WO2011141827A1 - Method and plant for dedusting a stream of dust-laden gases in a hybrid filter installation - Google Patents
Method and plant for dedusting a stream of dust-laden gases in a hybrid filter installation Download PDFInfo
- Publication number
- WO2011141827A1 WO2011141827A1 PCT/IB2011/051146 IB2011051146W WO2011141827A1 WO 2011141827 A1 WO2011141827 A1 WO 2011141827A1 IB 2011051146 W IB2011051146 W IB 2011051146W WO 2011141827 A1 WO2011141827 A1 WO 2011141827A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- dust
- laden gases
- esp
- ducts
- high voltage
- 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.)
- Ceased
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Images
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
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/02—Plant or installations having external electricity supply
- B03C3/04—Plant or installations having external electricity supply dry type
- B03C3/14—Plant or installations having external electricity supply dry type characterised by the additional use of mechanical effects, e.g. gravity
- B03C3/155—Filtration
-
- 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
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/02—Plant or installations having external electricity supply
- B03C3/04—Plant or installations having external electricity supply dry type
- B03C3/08—Plant or installations having external electricity supply dry type characterised by presence of stationary flat electrodes arranged with their flat surfaces parallel to the gas stream
-
- 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
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/34—Constructional details or accessories or operation thereof
- B03C3/36—Controlling flow of gases or vapour
- B03C3/361—Controlling flow of gases or vapour by static mechanical means, e.g. deflector
- B03C3/365—Controlling flow of gases or vapour by static mechanical means, e.g. deflector located after the filter
-
- 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
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/34—Constructional details or accessories or operation thereof
- B03C3/40—Electrode constructions
- B03C3/45—Collecting-electrodes
- B03C3/47—Collecting-electrodes flat, e.g. plates, discs, gratings
-
- 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
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C2201/00—Details of magnetic or electrostatic separation
- B03C2201/04—Ionising electrode being a wire
Definitions
- the present invention relates to a method for dedusting a stream of dust-laden gases in a hybrid filter installation, wherein dust-laden gases are dedusted in an electrostatic precipitator (ESP) having ducts provided with grounded collecting plates and high voltage electrodes and a fabric filter (FF).
- ESP electrostatic precipitator
- FF fabric filter
- Hybrid filter installations of the aforementioned kind are well known and widely used within e.g. the cement manufacturing industry.
- the average cleaning efficiency of a normal working ESP is about 99.9 % and the dust leaving the ESP suspended in the gases is mono-modal and constitutes the finest fraction of the dust which entered the ESP with the gases.
- the dense dust cake on the FF requires a high cleaning frequency and thus high compressed air consumption and a relatively short life of the filter media used in the FF. Further, it may also leads to a relatively high dust emission from the plant.
- this is achieved by a method of the kind mentioned in the introduction, and being characterized in that a part of the stream of dust-laden gases are bypassed the ducts in the ESP provided with grounded collecting plates and high voltage electrodes, and in that the bypassed dust-laden gases are mixed with dust-laden gases which have passed through ducts in the ESP provided with grounded collecting plates and high voltage electrodes before the mixed dust-laden gases are conducted to the FF.
- the dust in the dust-laden gases conducted to the FF is coarser, causing the filter cake on the FF to be of higher permeability, thus decreasing the pressure loss over the filter media in the FF, improving the filter media life time and reducing the use of compressed air for cleaning. Further, a lower dust emission from the plant is obtained. This is due to the fact that a considerable agglomeration of the dust particles takes place when the bypassed uncharged dust-laden gases and the charged dust-laden gases, which have passed through ducts in the ESP provided with grounded collecting plates and high voltage electrodes, are mixed, thus resulting in an overall coarser particle size distribution prior to settling on the FF filter media.
- the plant for carrying out the method according to the invention comprises a hybrid filter installation, wherein dust-laden gases are dedusted in an electrostatic precipitator (ESP) having ducts provided with grounded collecting plates and high voltage electrodes and a fabric filter (FF), and is characterized in that it comprises means for bypassing a part of the stream of dust-laden gases the ducts in the ESP provided with grounded collecting plates and high voltage electrodes, a mixing zone for mixing the bypassed dust-laden gases with dust-laden gases which have passed through ducts in the ESP provided with grounded collecting plates and high voltage electrodes before the mixed dust-laden gases are conducted to the FF.
- ESP electrostatic precipitator
- FF fabric filter
- the means for bypassing a part of the stream of dust-laden gases the ducts in the ESP provided with grounded collecting plates and high voltage electrodes may be a duct connecting an inlet duct to the ESP with outlet end of the ESP thus enabling a part of the dust-laden gases to be bypassed the ESP.
- Such bypass duct may preferable be provided with means for regulating the gas flow through it.
- the bypassing means may also be ducts within the ESP itself, and may preferably be provided in between the ducts provided with grounded collecting plates and high voltages electrodes. In the latter embodiment a better mixing ensuring bipolar agglomeration is obtained.
- the mixing zone may comprise mixing screens of the kind already marketed by the applicant of the present patent application.
- the invention is applicable for filter installations where the ESP and the FF are fitted within the same casing as well as where they are fitted within each their separate casing.
- Fig. 1 shows an embodiment of a hybrid filter installation according to the invention.
- Fig. 1 a hybrid filter installation for dedusting a stream of dust-laden gases and comprising an ESP 1 having an inlet duct 7 for gases to be dedusted, ducts 2 defined by grounded collecting plates 6 and provided with high voltage electrodes 3 and a FF 4 in form of a bag filter having bags 5.
- a stream of dust-laden gases to be dedusted are first introduced through the inlet duct 7 to the ESP 1, wherein the gases in traditional way are dedusted by being electrically charged by high voltages electrodes 3 provided in ducts 2 and collected by collecting plates 6, which are frequently cleaned by rapping means, not shown.
- the dust-laden gases are conducted to the FF 4, which as shown, may be a bag filter, wherein the gases are drawn through the bags 5 by means of a fan, not shown, while the dust settles on the outer side of the bags 5, thus creating a filter cake, which frequently is cleaned off by back flushing or compressed air pulsing.
- a part of the stream of dust-laden gases are bypassed the ducts 2 in the ESP 1 provided with grounded collecting plates 6 and high voltage electrodes 3 through ducts 8 within the ESP 1 itself, which ducts 8 are provided in between the ducts 2 provided with grounded collecting plates 6 and high voltages electrodes 3.
- the mixing zone 9 may comprise mixing screens 10 of the kind already marketed by the applicant of the present patent application.
Landscapes
- Electrostatic Separation (AREA)
Abstract
Described is a method as well as a plant for dedusting a stream of dust- laden gases in a hybrid filter installation, wherein dust- laden gases are dedusted in an electrostatic precipitator (ESP) (1) having ducts (2) provided with grounded collecting plates (6) and high voltage electrodes (3) and a fabric filter (FF) (4). The method and plant is peculiar in that a part of the stream of dust- laden gases are bypassed the ducts (2) in the ESP (1) provided with grounded collecting plates (6) and high voltage electrodes (3), and in that the bypassed dust- laden gases are mixed with dust- laden gases which have passed through ducts (2) in the ESP (1) provided with grounded collecting plates (6) and high voltage electrodes (3) before the mixed dust- laden gases are conducted to the FF (4).
Description
The present invention relates to a method
for dedusting a stream of dust-laden gases in a hybrid
filter installation, wherein dust-laden gases are dedusted
in an electrostatic precipitator (ESP) having ducts
provided with grounded collecting plates and high voltage
electrodes and a fabric filter (FF). The invention also
relates to a plant for carrying out the method.
Hybrid filter installations of the
aforementioned kind are well known and widely used within
e.g. the cement manufacturing industry. The average
cleaning efficiency of a normal working ESP is about 99.9 %
and the dust leaving the ESP suspended in the gases is
mono-modal and constitutes the finest fraction of the dust
which entered the ESP with the gases. This leads to an
often very dense dust cake with low permeability on the FF
and hence a high pressure loss over the FF. The dense dust
cake on the FF requires a high cleaning frequency and thus
high compressed air consumption and a relatively short
life of the filter media used in the FF. Further, it may
also leads to a relatively high dust emission from the plant.
It is the object of the present invention
to provide a method as well as a plant for dedusting a
stream of dust-laden gases in a hybrid filter installation
by means of which the aforementioned disadvantages are
eliminated or significantly reduced.
According to the invention this is achieved
by a method of the kind mentioned in the introduction, and
being characterized in that a part of the stream of
dust-laden gases are bypassed the ducts in the ESP
provided with grounded collecting plates and high voltage
electrodes, and in that the bypassed dust-laden gases are
mixed with dust-laden gases which have passed through
ducts in the ESP provided with grounded collecting plates
and high voltage electrodes before the mixed dust-laden
gases are conducted to the FF.
It is hereby obtained, that the dust in the
dust-laden gases conducted to the FF is coarser, causing
the filter cake on the FF to be of higher permeability,
thus decreasing the pressure loss over the filter media in
the FF, improving the filter media life time and reducing
the use of compressed air for cleaning. Further, a lower
dust emission from the plant is obtained. This is due to
the fact that a considerable agglomeration of the dust
particles takes place when the bypassed uncharged dust-laden
gases and the charged dust-laden gases, which have passed
through ducts in the ESP provided with grounded collecting
plates and high voltage electrodes, are mixed, thus
resulting in an overall coarser particle size distribution
prior to settling on the FF filter media.
The plant for carrying out the method
according to the invention comprises a hybrid filter
installation, wherein dust-laden gases are dedusted in an
electrostatic precipitator (ESP) having ducts provided with
grounded collecting plates and high voltage electrodes and a
fabric filter (FF), and is characterized in that it
comprises means for bypassing a part of the stream of
dust-laden gases the ducts in the ESP provided with grounded
collecting plates and high voltage electrodes, a mixing zone
for mixing the bypassed dust-laden gases with dust-laden
gases which have passed through ducts in the ESP provided
with grounded collecting plates and high voltage electrodes
before the mixed dust-laden gases are conducted to the FF.
The means for bypassing a part of the
stream of dust-laden gases the ducts in the ESP provided
with grounded collecting plates and high voltage
electrodes may be a duct connecting an inlet duct to the ESP
with outlet end of the ESP thus enabling a part of the
dust-laden gases to be bypassed the ESP. Such bypass duct
may preferable be provided with means for regulating the
gas flow through it. The bypassing means may also be ducts
within the ESP itself, and may preferably be provided in
between the ducts provided with grounded collecting plates
and high voltages electrodes. In the latter embodiment a
better mixing ensuring bipolar agglomeration is obtained.
The mixing zone may comprise mixing screens
of the kind already marketed by the applicant of the
present patent application.
The invention is applicable for filter
installations where the ESP and the FF are fitted within
the same casing as well as where they are fitted within
each their separate casing.
The invention will now be explained in
further details with reference to the drawing, being
diagrammatical, and where
Fig. 1 shows an embodiment of a hybrid
filter installation according to the invention.
In Fig. 1 is seen a hybrid filter
installation for dedusting a stream of dust-laden gases
and comprising an ESP 1 having an inlet duct 7 for gases
to be dedusted, ducts 2 defined by grounded collecting
plates 6 and provided with high voltage electrodes 3 and a
FF 4 in form of a bag filter having bags 5.
During operation of the hybrid filter
installation a stream of dust-laden gases to be dedusted
are first introduced through the inlet duct 7 to the ESP
1, wherein the gases in traditional way are dedusted by
being electrically charged by high voltages electrodes 3
provided in ducts 2 and collected by collecting plates 6,
which are frequently cleaned by rapping means, not shown.
After the ESP 1 the dust-laden gases are conducted to the FF
4, which as shown, may be a bag filter, wherein the gases
are drawn through the bags 5 by means of a fan, not shown,
while the dust settles on the outer side of the bags 5,
thus creating a filter cake, which frequently is cleaned off
by back flushing or compressed air pulsing.
In order to obtain that the dust in the
dust-laden gases conducted to the FF 4 is coarser, causing
the filter cake on the FF 4 to be of higher permeability,
thus decreasing the pressure loss over the filter media in
the FF 4, improving the filter media life time and reducing
the use of compressed air for cleaning, it is suggested
according to the present invention that a part of the
stream of dust-laden gases are bypassed the ducts 2 in the
ESP 1 provided with grounded collecting plates 6 and high
voltage electrodes 3, and in that the bypassed dust-laden
gases are mixed in a mixing zone 9 with dust-laden gases
which have passed through ducts in the ESP 1 provided with
grounded collecting plates 6 and high voltage electrodes 3
before the mixed dust-laden gases are conducted to the FF 4.
In the shown embodiment a part of the
stream of dust-laden gases are bypassed the ducts 2 in the
ESP 1 provided with grounded collecting plates 6 and high
voltage electrodes 3 through ducts 8 within the ESP 1
itself, which ducts 8 are provided in between the ducts 2
provided with grounded collecting plates 6 and high
voltages electrodes 3.
The mixing zone 9 may comprise mixing
screens 10 of the kind already marketed by the applicant
of the present patent application.
Claims (3)
- A method for dedusting a stream of dust-laden gases in a hybrid filter installation, wherein dust-laden gases are dedusted in an electrostatic precipitator (ESP) (1) having ducts (2) provided with grounded collecting plates (6) and high voltage electrodes (3) and a fabric filter (FF) (4), characterized in that a part of the stream of dust-laden gases are bypassed the ducts (2) in the ESP (1) provided with grounded collecting plates (6) and high voltage electrodes (3), and in that the bypassed dust-laden gases are mixed with dust-laden gases which have passed through ducts (2) in the ESP (1) provided with grounded collecting plates (6) and high voltage electrodes (3) before the mixed dust-laden gases are conducted to the FF (4).
- A plant for carrying out the method according to claim 1 comprising a hybrid filter installation, wherein dust-laden gases are dedusted in an electrostatic precipitator (ESP) (1) having ducts (2) provided with grounded collecting plates (6) and high voltage electrodes (3) and a fabric filter (FF) (4), characterized in that it comprises means (8) for bypassing a part of the stream of dust-laden gases the ducts (2) in the ESP (1) provided with grounded collecting plates (6) and high voltage electrodes (3), a mixing zone (9) for mixing the bypassed dust-laden gases with dust-laden gases which have passed through ducts (2) in the ESP (1) provided with grounded collecting plates (6) and high voltage electrodes (3) before the mixed dust-laden gases are conducted to the FF (4).
- A plant according to claim 2, characterized in that the mixing zone (9) comprises mixing screens (10).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DKPA201000417 | 2010-05-11 | ||
| DKPA201000417 | 2010-05-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2011141827A1 true WO2011141827A1 (en) | 2011-11-17 |
Family
ID=44114778
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/IB2011/051146 Ceased WO2011141827A1 (en) | 2010-05-11 | 2011-03-18 | Method and plant for dedusting a stream of dust-laden gases in a hybrid filter installation |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO2011141827A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103908862A (en) * | 2014-04-03 | 2014-07-09 | 江苏天洁环境工程有限公司 | Stacked type electrostatic fabric filter |
| ITUB20161246A1 (en) * | 2016-03-02 | 2017-09-02 | Ecospray Tech Srl | FILTERING SYSTEM WITH IMPROVED EFFICIENCY AND PROCESS FOR GAS DEPOLVERATION |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE362539A (en) * | ||||
| US5217511A (en) * | 1992-01-24 | 1993-06-08 | The United States Of America As Represented By The Administrator Of The Environmental Protection Agency | Enhancement of electrostatic precipitation with electrostatically augmented fabric filtration |
| JPH09972A (en) * | 1995-06-16 | 1997-01-07 | Hitachi Ltd | Ozone deodorizing dust collector |
| EP1125622A2 (en) * | 2000-02-14 | 2001-08-22 | Dart Industries Inc. | Air filtration system |
| EP1434012A2 (en) * | 2002-12-23 | 2004-06-30 | Samsung Electronics Co., Ltd. | Air purifier |
| WO2006101070A1 (en) * | 2005-03-24 | 2006-09-28 | Isuzu Motors Limited | Exhaust gas treating device and exhaust gas treating method |
| EP1837489A1 (en) * | 2004-12-17 | 2007-09-26 | FURUGEN, Munekatsu | Electric treating method for exhaust gas of diesel engine and its device |
-
2011
- 2011-03-18 WO PCT/IB2011/051146 patent/WO2011141827A1/en not_active Ceased
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE362539A (en) * | ||||
| US5217511A (en) * | 1992-01-24 | 1993-06-08 | The United States Of America As Represented By The Administrator Of The Environmental Protection Agency | Enhancement of electrostatic precipitation with electrostatically augmented fabric filtration |
| JPH09972A (en) * | 1995-06-16 | 1997-01-07 | Hitachi Ltd | Ozone deodorizing dust collector |
| EP1125622A2 (en) * | 2000-02-14 | 2001-08-22 | Dart Industries Inc. | Air filtration system |
| EP1434012A2 (en) * | 2002-12-23 | 2004-06-30 | Samsung Electronics Co., Ltd. | Air purifier |
| EP1837489A1 (en) * | 2004-12-17 | 2007-09-26 | FURUGEN, Munekatsu | Electric treating method for exhaust gas of diesel engine and its device |
| WO2006101070A1 (en) * | 2005-03-24 | 2006-09-28 | Isuzu Motors Limited | Exhaust gas treating device and exhaust gas treating method |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103908862A (en) * | 2014-04-03 | 2014-07-09 | 江苏天洁环境工程有限公司 | Stacked type electrostatic fabric filter |
| ITUB20161246A1 (en) * | 2016-03-02 | 2017-09-02 | Ecospray Tech Srl | FILTERING SYSTEM WITH IMPROVED EFFICIENCY AND PROCESS FOR GAS DEPOLVERATION |
| WO2017149489A1 (en) * | 2016-03-02 | 2017-09-08 | Ecospray Technologies S.R.L. | Gas dedusting filter apparatus and process |
| CN108883421A (en) * | 2016-03-02 | 2018-11-23 | 埃科斯普雷技术有限公司 | Dedusting filter plant and method |
| CN108883421B (en) * | 2016-03-02 | 2020-08-18 | 埃科斯普雷技术有限公司 | Gas dust removal and filtering equipment and method |
| US11117139B2 (en) | 2016-03-02 | 2021-09-14 | Ecospray Technologies S.R.L. | Gas dedusting filter apparatus and process |
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