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US20100180807A1 - 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 residues Download PDF

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Publication number
US20100180807A1
US20100180807A1 US12/527,517 US52751707A US2010180807A1 US 20100180807 A1 US20100180807 A1 US 20100180807A1 US 52751707 A US52751707 A US 52751707A US 2010180807 A1 US2010180807 A1 US 2010180807A1
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Prior art keywords
combustion
post
fumes
feeding
extractor
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Abandoned
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US12/527,517
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English (en)
Inventor
Mario Magaldi
Rocco Sorrenti
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Magaldi Ricerche e Brevetti SRL
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Magaldi Ricerche e Brevetti SRL
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Assigned to MAGALDI RICERCHE E BREVETTI S.R.L. reassignment MAGALDI RICERCHE E BREVETTI S.R.L. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MAGALDI, MARIO, SORRENTI, ROCCO
Publication of US20100180807A1 publication Critical patent/US20100180807A1/en
Abandoned legal-status Critical Current

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Classifications

    • 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
    • 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
    • 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).
  • Said heavy ashes are removed from the bottom of the combustion chamber by a dry extracting/cooling system typically made as illustrated in European Patent EP 0 471 055 B1, and may undergo an at least partial post-combustion on such an extracting system, so as to reduce unburnt content in end ashes.
  • the technical problem set and solved by the present invention is to provide a plant and a method for the post-combustion of unburnts in a system for dry—or mainly dry—extracting heavy ashes, overcoming the drawbacks mentioned above with reference to the known art.
  • the present invention provides several relevant advantages.
  • the main advantage lies in that it allows, above all in the mentioned case of biomass or RDF co-combustion, an effective and efficient post-combustion of unburnts on the primary extractor, thereby reducing the total content thereof, concomitantly allowing to avert the risk of an uncontrolled post-combustion.
  • the invention preferably acts both on the temperature of the heavy ashes extracted and on their residence time in an environment with a suitable temperature, typically the belt-equipped extractor portion arranged immediately downstream of the combustion chamber and facing thereon.
  • a suitable temperature typically the belt-equipped extractor portion arranged immediately downstream of the combustion chamber and facing thereon.
  • the combustibility rate of the latter increases proportionally.
  • the invention provides the inletting of hot air into the extractor and, in a preferred embodiment thereof, fuel residence time is adjusted by acting on the speed of the conveyor belt.
  • combustion exhaust gases preferably collected downstream of the electrofilter (or electrostatic precipitator) typically provided in plants to which the invention applies—are used to partially or completely replace comburent air.
  • the invention allows to increase the post-combustion capacity of dry or mainly dry extractors, making the extracting environment where ashes are moved more favorable to the reduction of unburnts present in the ashes themselves.
  • 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.
  • the post-combustion process preferably occurs and is completed in the extractor zone corresponding to the throat at the boiler bottom and optionally, if necessary and advisable for plant requirements, also in the subsequent section thereof.
  • the in-boiler downstream of a suitable cooling of the extracted heavy ashes, the in-boiler re-circulating thereof, along with the fraction of light ashes of higher unburnt content.
  • 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.
  • the permanence time of light ashes in said electrofilter is reduced by continuously re-circulating in combustion chamber the unburnt-richer fraction of light ashes.
  • the invention allows to reduce the risks of fires in the electrofilters when as fuels there are utilized biomasses or RDF that, by accumulating in the hoppers of the electrofilters themselves can cause fires by self-combustion, biomass or RDF unburnts being very reactive with respect to those from coal.
  • Total unburnt reduction attained both through post-combustion on the conveyor belt and re-circulating in combustion chamber, allows to save on consumption of ammonia utilized for NO x reduction in catalyzers.
  • a higher excess of combustion air would be required, with the entailed increase of NO x rate in exhaust gases and of the amount of ammonia required for their reduction.
  • the present invention relates to a system allowing to: extract heavy ash from the boiler bottom, foster and adjust post-combustion on the extractor belt by combined use of comburent hot air and inert combustion fumes, already available in boiler, cool the ashes present on the belt and optionally re-circulate them—all or in part—in boiler, along with the fraction of light ashes of higher unburnt content.
  • FIG. 1 shows a general exemplary diagram of a preferred embodiment of the plant of the invention
  • FIG. 2 shows a cross section of an extractor—afterburner of the plant of FIG. 1 , taken along line A-A of the latter figure;
  • FIG. 3 depicts a top plan view of a detail of a drilled extractor belt of the plant of FIG. 1 .
  • 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
  • RDF municipal solid waste
  • the plant 1 will be described with reference to the co-combustion of biomasses.
  • the plant 1 provides as biomass storing means the same bunkers, per se known, already used for coal.
  • the biomass-dedicated bunkers are the two depicted on the left in FIG. 1 and denoted by 21 and 22 , respectively.
  • the other bunkers and the associated additional components depicted in FIG. 1 are understood as used for coal, and therefore will not be further considered hereinafter, their structure and use being of a per se known type.
  • the bunkers 21 and 22 are those feeding the burners of the combustion chamber 12 at topmost levels, so as to have for the heavier particles a longer residence time in the combustion chamber itself during their falling to the bottom.
  • biomass is extracted by one or more conveyors 3 analogous to those already used for coal, or by augers.
  • biomass is supplied, by an intercepting valve 4 , to a dedicated meter 5 , in this case with three outlets, respectively denoted by 51 , 52 and 53 , and therefrom to one or more dedicated crushers, in this case three, respectively denoted by 61 , 62 and 63 .
  • said crushers 61 - 63 are implemented by per se known hammer mills.
  • said conveyors 3 constitute bypass means of known coal crushers, here denoted by F, associated to the bunkers 21 and 22 .
  • F known coal crushers
  • the crushers 61 - 63 are apt to reduce the biomass to a desired maximum end (outlet) grain size. As it will be better appreciated at the end of the description, it is not required that said final grain size be particularly fine, since the overall structure of the integrated plant 1 allows anyhow a complete combustion of the biomass even at such “coarse” grain sizes.
  • 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 pneumatic conveyors 93 are those developing from the coal crushing mills F (not used) associated to the bunkers 21 and 22 .
  • crushed biomasses are introduced in the feed pipes feeding coal dust, and therefrom fed to the burners of the boiler 12 , it also of a type already present in existing solid-fuel plants.
  • unburnt post-combustion goes on.
  • the top surface of the extractor belt, and in particular of the portion 141 receives heat by irradiation from the burners of the combustion chamber 12 .
  • the plant of the invention may also comprise a biomass meter 18 independent of the combustion chamber 12 and a feeder 19 , depicted also in FIG. 1 , arranged upstream of the extractor 14 (or at least upstream or in correspondence of the portion 141 thereof), to supply unburnt biomass directly to the extractor 14 itself, for a first combustion of the latter biomass in the post-combustion zone 141 .
  • a first drying of said biomasses may be carried out by a feeding of hot air on the feeder 19 ; advantageously, said hot air may come from an air/fumes exchanger 29 , already present in existing thermoelectric plants and that will be introduced hereinafter.
  • control means 100 for controlling unburnt post-combustion occurring on said post-combustion portion 141 .
  • Said means 100 in turn comprises means 15 for feeding hot air and means 150 for feeding combustion exhaust gases (fumes), apt to provide a flow of heated air and of combustion fumes, respectively, in correspondence of said post-combustion portion 141 in order to respectively foster and inhibit post-combustion.
  • 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 above-mentioned 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 .
  • Said air chamber 151 , air pre-heater 29 and electrostatic precipitator 28 are well-known to a person skilled in the art and already present in known plants; therefore, a further description thereof will be omitted.
  • 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 .
  • Both the air feeding means 15 and the fume feeding means 150 may be equipped with respective means for automatically adjusting the flow rate, respectively denoted by 102 and 103 in FIG. 1 , controlled by the control means 100 .
  • the control means 100 is apt to adjust the flow rate of hot air and/or of fumes fed into the post-combustion portion 141 , and for this purpose it comprises automatic means for adjusting said flow rates of air and fumes depending on the temperature detected by suitable sensors, preferably arranged in correspondence of said post-combustion portion 141 .
  • fume flow rate is increased and accordingly hot air flow rate is reduced:
  • oxygen concentration is reduced, reducing the combustion rate.
  • the fumes produced by the combustion process of the boiler may integrate or replace comburent air to adjust or stop on-belt combustion thanks to the low ( ⁇ 6%) O 2 concentration in the fumes, enabling its use as inert gas.
  • the temperature is lower than a preset limit, fume inletting is inhibited and hot-air flow rate is increased, optionally reducing also the flow rate of room-temperature air introduced by the means 143 .
  • an additional fan may be installed, when required, to provide them with the head required for the inletting into the extractor/afterburner 14 .
  • 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.
  • the extractor belt portion not facing onto the boiler bottom is instead dedicated to the cooling, which may be carried out by the feeding of combustion fumes (with dedicated means) and cold air (with the above-introduced means 143 ), taking care to inlet the fluid in the conveying zone by exploiting the negative pressure in the boiler, and so as to have the fluid lick the cover of the extractor 14 , cooling it.
  • 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 FIG. 3 .
  • said hopper 201 forms part of a pressure insulation system apt to create just a pressure separation between the environments of the extractor 14 and of said cooling conveyor 16 .
  • the hopper 201 forms means for accumulating the conveyed material, allowing the forming of a head of material between said environments, creating said pressure separation.
  • Said pressure insulation system allows a more effective management of the air-assisted cooling of the ashes, as it allows—when required and typically on the basis of ash temperature and flow rate detections performed, e.g., at their discharge onto the extractor 14 - to avoid the introduction of an excessive amount of cooling air into the combustion chamber 12 , just by selectively activating such a pressure separation, as described also in PCT/IT2006/000625.
  • 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 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 plant 1 incorporates a central adjustment and control system, capable of ensuring the automated carrying out of the steps described hereto.
  • the described plant allows to attain a reduction in unburnts present in heavy ashes, by a controlled post-combustion process on the extractor belt and by re-circulating in boiler the heavy ashes thus produced and the light ashes having higher unburnt content, the latter ashes coming from the electrofilters.
  • thermoelectric power plants 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.
  • the present invention provides biomass combustion directly on the extractor belt, utilizing part of the pre-heated air, and it optimizes mixed combustion of biomasses in coal dust boilers, by heavy ash re-circulating.
  • the invention also refers to a method for the (co-) combustion of biomasses in a solid-fuel thermoelectric power plant of the above-described type, said method providing the dry extraction of heavy ashes and unburnts from the combustion chamber 12 by an extractor 14 of the above-mentioned type, and wherein in correspondence of the portion 141 of the latter there occurs a post-combustion of the unburnts controlled by the selective feeding of a flow of hot air and of a flow of combustion fumes in order to respectively foster and inhibit the post-combustion, the flow rate of hot air and/or of fumes fed into said post-combustion portion being adjusted.

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  • 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)
US12/527,517 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 Abandoned US20100180807A1 (en)

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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

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EP (1) EP2126469A1 (es)
JP (1) JP5216783B2 (es)
KR (1) KR101428831B1 (es)
CN (1) CN101641552A (es)
AU (1) AU2007347640A1 (es)
BR (1) BRPI0721307A2 (es)
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CN102221210A (zh) * 2011-05-25 2011-10-19 大连科林能源工程技术开发有限公司 多维化学废弃物焚烧处理和余热回收烟气低温排放系统
US20120031312A1 (en) * 2010-08-04 2012-02-09 Clyde Bergemann Drycon Gmbh Apparatus and method for the post combustion of hot material on a conveyor
US20120183376A1 (en) * 2009-09-24 2012-07-19 Mario Magaldi System for extraction and transport of light ashes by means of a steel belt conveyor
US20130247845A1 (en) * 2010-12-27 2013-09-26 Mitsubishi Heavy Industries, Ltd. Heat recovery and utilization system
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CN113237070A (zh) * 2021-03-17 2021-08-10 西安交通大学 一种风冷式干渣机缓存渣井补风门

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CA2678727A1 (en) 2008-08-28
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