EP2126469A1 - Plant and method for dry extracting / cooling heavy ashes and for controlling the combustion of high unburnt content residues - Google Patents
Plant and method for dry extracting / cooling heavy ashes and for controlling the combustion of high unburnt content residuesInfo
- Publication number
- EP2126469A1 EP2126469A1 EP07736641A EP07736641A EP2126469A1 EP 2126469 A1 EP2126469 A1 EP 2126469A1 EP 07736641 A EP07736641 A EP 07736641A EP 07736641 A EP07736641 A EP 07736641A EP 2126469 A1 EP2126469 A1 EP 2126469A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- combustion
- plant
- post
- fumes
- extractor
- 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- Withdrawn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
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C7/00—Combustion apparatus characterised by arrangements for air supply
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23B—METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
- F23B40/00—Combustion apparatus with driven means for feeding fuel into the combustion chamber
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
- F23C9/06—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber for completing combustion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/08—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating
- F23G5/14—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating including secondary combustion
- F23G5/16—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating including secondary combustion in a separate combustion chamber
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J1/00—Removing ash, clinker, or slag from combustion chambers
- F23J1/02—Apparatus for removing ash, clinker, or slag from ash-pits, e.g. by employing trucks or conveyors, by employing suction devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J3/00—Removing solid residues from passages or chambers beyond the fire, e.g. from flues by soot blowers
- F23J3/06—Systems for accumulating residues from different parts of furnace plant
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L15/00—Heating of air supplied for combustion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C2202/00—Fluegas recirculation
- F23C2202/30—Premixing fluegas with combustion air
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2900/00—Special features of, or arrangements for incinerators
- F23G2900/00001—Exhaust gas recirculation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2900/00—Special arrangements for conducting or purifying combustion fumes; Treatment of fumes or ashes
- F23J2900/01002—Cooling of ashes from the combustion chamber by indirect heat exchangers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2900/00—Special arrangements for conducting or purifying combustion fumes; Treatment of fumes or ashes
- F23J2900/01003—Ash crushing means associated with ash removal means
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/12—Heat utilisation in combustion or incineration of waste
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Definitions
- the present invention refers to a plant and a method for dry, or mainly dry extracting / cooling and reducing unburnts in heavy ashes produced by boilers of the type used in solid fuel thermoelectric power plants.
- Such plant and method are specifically suitable in the case of boilers burning, under co-combustion, conventional solid fuel (typically coal dust) and non-conventional fuel, especially biomasses and/or fuel derived from municipal solid waste (RDF).
- conventional solid fuel typically coal dust
- non-conventional fuel especially biomasses and/or fuel derived from municipal solid waste (RDF).
- the combined use of hot air and combustion fumes according to the invention allows to have total control on unburnt combustion on the extractor-afterburner belt.
- downstream of the post- combustion process there starts the cooling of the ash by air, which, in a controlled and adjusted amount, is let into the extractor, in the end portion of conveying, and/or in a secondary conveyor/cooler (post-cooler) arranged downstream of the primary extractor.
- a secondary conveyor/cooler post-cooler
- a screening station allowing to eliminate any plastics or metallic residue present in the ashes.
- a combustion plant made according to a preferred embodiment of the invention is generally denoted by 1.
- the plant 1 is of the type used in thermoelectric solid fuel power plants firing solid fuel, in particular coal dust, and it is suitable for the (co-)combustion of biomasses and/or fuel derived from municipal solid waste (RDF).
- solid fuel in particular coal dust
- screening means 71 , 72 and 73 Downstream of the mills 61-63 there are respective screening means 71 , 72 and 73 apt to intercept biomass particles of a grain size greater than a predetermined threshold, in order to resend them, through dedicated mechanical or pneumatic conveyors 8, to the meter 5 and then into the same hammer mills 61-63 for a new crushing thereof. Finer biomass particles crossing the screening means 71-73 are carried by a common (shared) conveyor 9 to a single meter 10 and then, by means of a two-way valve 91 , fed to known-type pneumatic conveyors 93, the latter already present in existing solid fuel plants in association with the crushers F.
- the feeding means 15 and 150 comprises respective ducts for the collecting respectively of heated air from an air chamber 151 associated to the boiler 12 and of exhaust fumes downstream of an electrostatic precipitator (electrofilter) 28 of the plant 1.
- hot air in the air chamber 151 comes from the abovementioned exchanger 29, which in the present embodiment is a fumes/air exchanger arranged downstream of the combustion chamber 12 and exploiting just the residual heat of the combustion fumes to heat outside air.
- hot air fed by the means 15 may also be bled directly from the latter exchanger 29.
- the means 15 for feeding hot air comprises means 143 for the controlled (adjusted) inletting of outside air, e.g. inlets made on the casing of the extractor 14 and associated to one or more valves preferably controlled by the control means 100, allowing to attain a desired oxygen content and an appropriate temperature of the air inlet into the extractor 14.
- heated air fed by the means 15 and suitably proportioned with atmospheric air allows to attain on the extractor/afterburner belt 14 a temperature optimal for post-combustion.
- Said means 143 can also exploit the negative pressure present in the combustion chamber 12 for the feeding of air from the outside.
- the overall arrangement is such that the hot-air feeding means 15 and the fume feeding means 150 is apt to supply a flow countercurrent with respect to the direction of advance of the belt of the extractor 14 itself, at least in the above- introduced post-combustion portion 141.
- the piping for the fumes of the feeding means 150 should be insulated, just to hold a temperature higher than the condensation one.
- the fumes utilized for controlling the combustion, in addition to the extinguishing power exhibit also an appreciable cooling capacity, since their temperature is no higher than 150°C.
- said fumes come from the zone downstream of the electrofilter, i.e. are collected when they have already lost their thermal content.
- the post-combustion portion 141 is concentrated exclusively or nearly exclusively in the irradiated zone below the throat of the boiler 12, and controlled by feeding hot air and/or fumes in the manner disclosed above.
- nozzles104 preferably provided in plural zones of the extractor/afterburner 14, and in particular (at least) in the primary crushing zone (i.e. in the end portion of the extractor 14 with respect to the direction of advance of the ashes).
- hot air fed by the means 15 is supplied below the belt of the extractor 14, and in particular below the portion 141 thereof, as mentioned above in countercurrent to the flow of heavy ashes and unburnts.
- the belt of the extractor 14 may be provided with perforations (holes) or slots 142, shown in Figure 3.
- hot air in addition to heating the bottom of the extractor 14, crosses the bed of ash and unbumts and partially returns into the combustion chamber 12, thanks to the negative pressure present in the latter, re-feeding heat therein.
- Such a passage of air is fostered by the pressure difference existing between the bottom portion of the belt conveyor and the bottom of the boiler. Hot-air transit through the holes of the belt conveyor of the extractor 14 allows a greater and more effective contact of air itself with the ash present on the belt, with the result of enhancing the combustion efficiency of the unburnt material.
- the head of material forming at the level of the hopper 201 may be adjusted by acting on the relative and absolute advance speeds of the conveyors 14 and 16.
- the heated air outlet from the conveyor 16 is fed into a section 26 of the fume ducts 13 of the plant 1 by a further suitable duct 25 originating from the end portion of the conveyor 16 itself and provided with means for automatically adjusting the flow rate.
- a connection between the post-cooler 16 and the boiler side may occur upstream or downstream of the abovementioned air pre-heater 29 (fumes side) arranged along the fume ducts 13.
- cooling air inlet to the post-cooler 16 is recalled by the negative pressure value existing in said boiler-side zone.
- the plant 1 provides also a bypass piping or duct, (for simplicity's sake omitted from the figures) connecting the extractor/afterburner 14 with the conveyor- cooler 16 and provided with automatic opening/closing valve.
- a secondary crusher 202 of opposing roll or equivalent type suitable for crushing ash only, and in particular capable of reducing the grain size of the latter without altering the grain size of any plastics material mixed to the ash and deriving from RDF combustion.
- a secondary crusher 202 of opposing roll or equivalent type, suitable for crushing ash only, and in particular capable of reducing the grain size of the latter without altering the grain size of any plastics material mixed to the ash and deriving from RDF combustion.
- this typology of crusher already known to a person skilled in the art, plastics particles transit through the rolls deforming, yet without breaking.
- a mechanical or pneumatic screening system 203 located downstream of the second crushing stage (step) associated to the device 202, for separating ash from plastics particulate and any metallic parts present in the RDF that are stored or forwarded to disposal by dedicated means.
- Crushed ash is forwarded to coal pulverizing mills via a mechanical or pneumatic conveyor 204, so as to be re-circulated in combustion chamber through the coal pulverizing mills and the boiler burners as described in the International Application PCT/EP2005/007536.
- the light ashes precipitated into said electrostatic precipitator 28 are collected by suitable means 30 for their re-circulating in combustion chamber.
- the above-described integrated system for the dry extraction, crushing, biomass post-combustion and heavy ashes and unburnt re- circulating allows to enhance the combustion capacity of biomasses (and generally of non-conventional fuel) and also to increase the combustion efficiency thereof.
- the described system concomitantly allows the use of the apparatuses already present in the existing thermoelectric power plants, reducing plant installation costs and requiring minimum adjustment measures of the existing ones.
- biomasses and, in general, non-conventional fuel masses
- boiler bunkers currently representing the means for accumulating traditional solid fuel material can be utilized for biomasses as well.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Gasification And Melting Of Waste (AREA)
- Combustion Of Fluid Fuel (AREA)
Abstract
Description
Claims
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/IT2007/000118 WO2008102387A1 (en) | 2007-02-20 | 2007-02-20 | Plant and method for dry extracting / cooling heavy ashes and for controlling the combustion of high unburnt content residues |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2126469A1 true EP2126469A1 (en) | 2009-12-02 |
Family
ID=38991219
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07736641A Withdrawn EP2126469A1 (en) | 2007-02-20 | 2007-02-20 | Plant and method for dry extracting / cooling heavy ashes and for controlling the combustion of high unburnt content residues |
Country Status (11)
Country | Link |
---|---|
US (1) | US20100180807A1 (en) |
EP (1) | EP2126469A1 (en) |
JP (1) | JP5216783B2 (en) |
KR (1) | KR101428831B1 (en) |
CN (1) | CN101641552A (en) |
AU (1) | AU2007347640A1 (en) |
BR (1) | BRPI0721307A2 (en) |
CA (1) | CA2678727A1 (en) |
EA (1) | EA016107B1 (en) |
MX (1) | MX2009008840A (en) |
WO (1) | WO2008102387A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105546559A (en) * | 2015-12-09 | 2016-05-04 | 无锡西源电力装备厂 | Boiler slag discharge equipment |
Families Citing this family (14)
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KR100958241B1 (en) * | 2008-06-30 | 2010-05-17 | 한국서부발전 주식회사 | Operating control method of coal-fired power plant |
IT1396049B1 (en) * | 2009-09-24 | 2012-11-09 | Magaldi Ind Srl | ASH EXTRACTION AND TRANSPORTATION SYSTEM READ THROUGH THE STEEL TAPE CONVEYOR. |
DE102010033307A1 (en) * | 2010-08-04 | 2012-02-09 | Clyde Bergemann Drycon Gmbh | Apparatus and method for post-burning hot material on a conveyor |
JP5636955B2 (en) * | 2010-12-27 | 2014-12-10 | 三菱日立パワーシステムズ株式会社 | Heat recovery system |
IT1405071B1 (en) * | 2011-01-21 | 2013-12-16 | Magaldi Power Spa | PLANT AND METHOD OF EXTRACTION AND COOLING OF ASH WITH INCREASE OF THE TOTAL EFFICIENCY OF THE BOILER. |
CN102221210B (en) * | 2011-05-25 | 2012-12-12 | 大连科林能源工程技术开发有限公司 | Low temperature discharge system for disposing multi-dimensional chemistry waste burning and recovering afterheat smoke |
CN102192513B (en) * | 2011-05-25 | 2012-08-29 | 大连科林能源工程技术开发有限公司 | Incinerator of multi-element multi-dimension chemical hazardous waste |
CN102635852B (en) * | 2012-05-02 | 2014-04-02 | 中国科学院工程热物理研究所 | Fuel oil/gas boiler for reducing emission of nitric oxides and method |
ITRM20120351A1 (en) | 2012-07-20 | 2014-01-21 | Magaldi Ind Srl | DRY TRANSPORT SYSTEM OF STORAGE AND / OR HETEROGENEOUS MATERIALS. |
CN102829467B (en) * | 2012-09-25 | 2015-03-25 | 中国东方电气集团有限公司 | Ash residue re-circulating method and system for preventing boiler from being contaminated |
CN102829468B (en) * | 2012-09-25 | 2015-02-04 | 中国东方电气集团有限公司 | Coal ash and ash combined re-circulating system for preventing boiler from being polluted |
ITUB20152285A1 (en) * | 2015-07-17 | 2017-01-17 | Magaldi Ind Srl | CONVEYOR TRANSPORT SYSTEM FOR LARGE LOOSE MATERIAL FLOWS |
CN113237070B (en) * | 2021-03-17 | 2022-06-03 | 西安交通大学 | Air-cooled dry sediment machine buffer memory sediment well air supplement door |
JP2024024168A (en) * | 2022-08-09 | 2024-02-22 | 三菱重工業株式会社 | Biomass pulverization system, and operation method for biomass pulverization system |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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EP0931981A2 (en) * | 1998-01-15 | 1999-07-28 | Magaldi Ricerche E Brevetti S.R.L. | Apparatus and method for postcombustion of heavy ash with high contents of unburnt matter |
US20050098072A1 (en) * | 2003-11-10 | 2005-05-12 | Rem Engineering, Inc. | Method and apparatus for the gasification and combustion of animal waste, human waste, and/or biomass using a moving grate over a stationary perforated plate in a configured chamber |
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ITMI20020744A1 (en) * | 2002-04-09 | 2003-10-09 | Magaldi Ricerche & Brevetti | AIR AND WATER COOLING CONVEYOR OF HOT BULK MATERIALS |
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-
2007
- 2007-02-20 WO PCT/IT2007/000118 patent/WO2008102387A1/en active Application Filing
- 2007-02-20 EA EA200901137A patent/EA016107B1/en not_active IP Right Cessation
- 2007-02-20 BR BRPI0721307-7A patent/BRPI0721307A2/en not_active IP Right Cessation
- 2007-02-20 JP JP2009549501A patent/JP5216783B2/en not_active Expired - Fee Related
- 2007-02-20 CA CA002678727A patent/CA2678727A1/en not_active Abandoned
- 2007-02-20 US US12/527,517 patent/US20100180807A1/en not_active Abandoned
- 2007-02-20 KR KR1020097019598A patent/KR101428831B1/en active IP Right Grant
- 2007-02-20 EP EP07736641A patent/EP2126469A1/en not_active Withdrawn
- 2007-02-20 AU AU2007347640A patent/AU2007347640A1/en not_active Abandoned
- 2007-02-20 MX MX2009008840A patent/MX2009008840A/en not_active Application Discontinuation
- 2007-02-20 CN CN200780051402A patent/CN101641552A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0931981A2 (en) * | 1998-01-15 | 1999-07-28 | Magaldi Ricerche E Brevetti S.R.L. | Apparatus and method for postcombustion of heavy ash with high contents of unburnt matter |
US20050098072A1 (en) * | 2003-11-10 | 2005-05-12 | Rem Engineering, Inc. | Method and apparatus for the gasification and combustion of animal waste, human waste, and/or biomass using a moving grate over a stationary perforated plate in a configured chamber |
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Title |
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See also references of WO2008102387A1 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105546559A (en) * | 2015-12-09 | 2016-05-04 | 无锡西源电力装备厂 | Boiler slag discharge equipment |
Also Published As
Publication number | Publication date |
---|---|
MX2009008840A (en) | 2009-10-13 |
JP2010519493A (en) | 2010-06-03 |
BRPI0721307A2 (en) | 2013-01-08 |
JP5216783B2 (en) | 2013-06-19 |
AU2007347640A1 (en) | 2008-08-28 |
WO2008102387A1 (en) | 2008-08-28 |
CA2678727A1 (en) | 2008-08-28 |
CN101641552A (en) | 2010-02-03 |
EA016107B1 (en) | 2012-02-28 |
KR20100014491A (en) | 2010-02-10 |
EA200901137A1 (en) | 2010-04-30 |
KR101428831B1 (en) | 2014-08-08 |
US20100180807A1 (en) | 2010-07-22 |
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