GB2055628A - Apparatus for removing impurities from gases - Google Patents
Apparatus for removing impurities from gases Download PDFInfo
- Publication number
- GB2055628A GB2055628A GB7927266A GB7927266A GB2055628A GB 2055628 A GB2055628 A GB 2055628A GB 7927266 A GB7927266 A GB 7927266A GB 7927266 A GB7927266 A GB 7927266A GB 2055628 A GB2055628 A GB 2055628A
- Authority
- GB
- United Kingdom
- Prior art keywords
- particles
- gas
- separator
- electro
- static
- 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.)
- Withdrawn
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
- F23J15/022—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
- F23J15/027—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow using cyclone separators
-
- 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
- B03C3/019—Post-treatment of gases
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
- B04C9/00—Combinations with other devices, e.g. fans, expansion chambers, diffusors, water locks
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/04—Air intakes for gas-turbine plants or jet-propulsion plants
- F02C7/05—Air intakes for gas-turbine plants or jet-propulsion plants having provisions for obviating the penetration of damaging objects or particles
- F02C7/052—Air intakes for gas-turbine plants or jet-propulsion plants having provisions for obviating the penetration of damaging objects or particles with dust-separation devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
- B04C9/00—Combinations with other devices, e.g. fans, expansion chambers, diffusors, water locks
- B04C2009/002—Combinations with other devices, e.g. fans, expansion chambers, diffusors, water locks with external filters
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electrostatic Separation (AREA)
- Cyclones (AREA)
Abstract
Apparatus for removing impurities from a gas comprises in flow series an electrostatic separator (14) which receives contaminated gas from a coal burning fluidised bed combustor (10). The partially cleansed gas flows from the separator (14) to a pair of cyclone separators (20, 21) connected together in series. The clean air produced is to drive a gas turbine (23). <IMAGE>
Description
SPECIFICATION
Electrostatic filters
This invention relates to apparatus for removing impurities from gases.
It is frequently necessary to clean large volumes of gas. The vent stocks for industrial and chemical process plants are one area where this is necessary and another such necessity arises in the cleaning of exhaust gas from a coal firing burner which is to be used to power a gas turbine.
The types of impurity in the gas may include relatively large particles of ash or the like but also include much smaller particles such as aerosols of sodium and potassium which are particularly found to be present in the coal burning exhaust gas referred to above. It is normal practice to remove particles by a centrifugal separation method and to remove the smaller aerosols using an electrostatic precipitator or the like. However, it has been found to be difficult to arrange for removal of the collected aerosols from the electro-static device.
The present invention provides an apparatus in which the presence of the life particles is itself used to assist continuous cleaning of the electro-static device.
According to the present invention apparatus for removing impurities from a gas comprises an electro-static separator in which both large and small particles are simultaneously removed from the gas followed by a centrifugal separator connected in series with the electro-static device.
In this way the small aerosol particles are caused to adhere to the larger particles and then may be removed from the electro-static device by vibration or simply by gas flow to be connected in the centrifugal separator.
The invention will now be particularly described merely by way of example with reference to the accompanying drawing which shows a coal burning gas turbine arrangement using apparatus in accordance with the present invention.
In the diagram there is shown a fluidised bed combustion system 10 which is fed with pulverised coal from a hopper 11. Air for the combustion of a coal enters the bed through an intake 1 2. The exhaust gas from the fluidised bed leaves through a duct 1 3. It will be appreciated that the exhaust gas will include a significant proportion of impurities. In particular there are particles of sodium and potassium at a level of approximately one part per mile by weight and having particle sizes in the range 0.1-1 microns. In addition there will be a proportion of relatively larger particles of ash of 2-50 microns in size.
In order to remove these impurities from the gas an electro-static separator 1 4 is provided. In the separator the gas passes in between wires 1 5 which are charged by a duct 1 6 to a high negative electro-static potential relative to surrounding plates or tubes.
The particles of ash together with the aerosol sodium and potassium particles are attracted away from the wires and stick to the plates.
Because of the presence of the relatively large particles of ash the aerosol particles are more likely to adhere to the ash particles rather than to the plates themselves. They can therefore be removed from the plates by a simple technique such as vibration of the plates or even by this scrubbing effect of the gas stream.
In the diagram the separator 14 is shown to have a sloping floor 1 7 which would direct particles which have fallen from the plates to a waste outlet 18.
Exhaust gas from the separator 14 then flows through a duct 1 9 to a pair of conventional cyclone separators 20 and 21 mounted in flow series. In these separators the remaining ash particles which are likely to be present in quantities too great to be dealt with by the electro-static duct, are removed. The clean air thus produced passes through an outlet duct 22 to drive a gas turbine 23 whose output at shaft 24 will be used to drive any form of load.
It will be understood that in effect the apparatus of the invention reverses the normal sequence of centrifugal separator and electrostatic separator. In this way the eleetro-static device is enabled to be self cleaning in operation when used with very small particles which would otherwise be difficult to remove.
1. Apparatus for removing impurities from a gas comprising a electrostatic separator in which both large and small particles are simultaneously removed from a gas by a centrifugal separator connected in series with the electrostatic separator.
2. Apparatus for removing impurities from a gas constructed and arranged for use and operation substantially as herein described, and with reference to the accompanying drawings.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (2)
1. Apparatus for removing impurities from a gas comprising a electrostatic separator in which both large and small particles are simultaneously removed from a gas by a centrifugal separator connected in series with the electrostatic separator.
2. Apparatus for removing impurities from a gas constructed and arranged for use and operation substantially as herein described, and with reference to the accompanying drawings.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB7927266A GB2055628A (en) | 1979-08-04 | 1979-08-04 | Apparatus for removing impurities from gases |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB7927266A GB2055628A (en) | 1979-08-04 | 1979-08-04 | Apparatus for removing impurities from gases |
Publications (1)
Publication Number | Publication Date |
---|---|
GB2055628A true GB2055628A (en) | 1981-03-11 |
Family
ID=10507007
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB7927266A Withdrawn GB2055628A (en) | 1979-08-04 | 1979-08-04 | Apparatus for removing impurities from gases |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB2055628A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3141156A1 (en) * | 1981-10-16 | 1983-04-28 | Robert Bosch Gmbh, 7000 Stuttgart | METHOD AND DEVICE FOR REMOVING SOLID COMPONENTS AND AEROSOLS, ESPECIALLY SOOT COMPONENTS FROM THE EXHAUST GAS FROM COMBUSTION ENGINES |
EP0450517A2 (en) * | 1990-03-30 | 1991-10-09 | Kabushiki Kaisha Toshiba | Combustion system for suppressing emission of gases believed to cause green-house-effect |
DE4104923A1 (en) * | 1990-08-30 | 1992-03-05 | Asea Brown Boveri | METHOD FOR REMOVING DUST FROM A GAS FLOW AND DUST DUSTING SYSTEM |
GB2418163A (en) * | 2004-09-21 | 2006-03-22 | Samsung Kwangju Electronics Co | Electrostatically aided cyclonic dust-collecting apparatus |
EP1769851A1 (en) * | 2005-09-27 | 2007-04-04 | Balcke-Dürr GmbH | Electrostatic precipitator |
-
1979
- 1979-08-04 GB GB7927266A patent/GB2055628A/en not_active Withdrawn
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3141156A1 (en) * | 1981-10-16 | 1983-04-28 | Robert Bosch Gmbh, 7000 Stuttgart | METHOD AND DEVICE FOR REMOVING SOLID COMPONENTS AND AEROSOLS, ESPECIALLY SOOT COMPONENTS FROM THE EXHAUST GAS FROM COMBUSTION ENGINES |
EP0450517A2 (en) * | 1990-03-30 | 1991-10-09 | Kabushiki Kaisha Toshiba | Combustion system for suppressing emission of gases believed to cause green-house-effect |
EP0450517A3 (en) * | 1990-03-30 | 1992-03-18 | Kabushiki Kaisha Toshiba | Combustion system for suppressing emission of gases believed to cause green-house-effect |
DE4104923A1 (en) * | 1990-08-30 | 1992-03-05 | Asea Brown Boveri | METHOD FOR REMOVING DUST FROM A GAS FLOW AND DUST DUSTING SYSTEM |
WO1992004122A1 (en) * | 1990-08-30 | 1992-03-19 | Asea Brown Boveri Ag | Process and device for cleaning waste gases |
GB2418163A (en) * | 2004-09-21 | 2006-03-22 | Samsung Kwangju Electronics Co | Electrostatically aided cyclonic dust-collecting apparatus |
DE102005014541B4 (en) * | 2004-09-21 | 2008-08-28 | Samsung Gwangju Electronics Co. Ltd. | Cyclone dust collector |
GB2418163B (en) * | 2004-09-21 | 2008-09-10 | Samsung Kwangju Electronics Co | Electrostatically-Aided Cyclonic Dust-Collecting Apparatus |
US7497899B2 (en) | 2004-09-21 | 2009-03-03 | Samsung Gwangju Electronics Co., Ltd. | Cyclone dust collecting apparatus |
EP1769851A1 (en) * | 2005-09-27 | 2007-04-04 | Balcke-Dürr GmbH | Electrostatic precipitator |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CA2685734C (en) | Process of electrostatic recirculation for dedusting and gas cleaning and device | |
US8506687B2 (en) | Electrostatic precipitator and self cleaning collection belt therefor | |
US7381379B2 (en) | Sorbent re-circulation system for mercury control | |
US6238459B1 (en) | Ultra-high particulate collection of sub-micron aerosols | |
US20160144380A1 (en) | Composite dust collector | |
US4482351A (en) | Process for removing ash from coal | |
GB2055628A (en) | Apparatus for removing impurities from gases | |
DE2964573D1 (en) | Dust separation device | |
EP0009857A3 (en) | Fly ash agglomerator, flue equipped with this agglomerator and process for removing suspended charged particles of mixed size from a volume of gas | |
JP2008173618A (en) | Oil-mist capturing apparatus | |
GB724790A (en) | Apparatus for removing suspended materials from gas streams | |
KR102317976B1 (en) | Swirling flow type electic dust collector including multicyclone | |
CN112915707A (en) | Coupling cyclone electric bag particle separation device and separation method | |
CN219848799U (en) | Chemical industry dust collector for mechanical environmental protection | |
CN215962783U (en) | Environment-friendly air dust removal equipment | |
CN209801471U (en) | Circulating fluidized bed boiler capable of achieving electrostatic dust removal | |
RU2755361C1 (en) | Electrostatic cyclone dust collector | |
SU801852A1 (en) | Electric filter | |
SU990311A1 (en) | Device for cleaning gas from dust | |
SU808160A1 (en) | Electric filter | |
JPS57180445A (en) | Dust filtering and collecting device | |
SU980842A1 (en) | Electric filter | |
SU364346A1 (en) | ELECTROCYCLONE | |
SU904748A1 (en) | Dust trapping unit | |
Petheram | Air cleaning by electricity |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |