EP3056811B1 - Verfahren zur kühlung von feststoffrückständen eines verbrennungsprozesses - Google Patents

Verfahren zur kühlung von feststoffrückständen eines verbrennungsprozesses Download PDF

Info

Publication number: EP3056811B1
Authority: EP; European Patent Office
Prior art keywords: coolant; conveying; conveyor belt; cooling medium; strand
Prior art date: 2015-02-10
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.): Active

Application number

EP16154630.4A

Other languages

German (de)

English (en)

French (fr)

Other versions

EP3056811A1 (de

Inventor

Nicolas Tran

Werner Brennwald

Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

Kanadevia Inova AG

Original Assignee

Hitachi Zosen Innova AG

Priority date (The priority date 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 date listed.)

2015-02-10

Filing date

2016-02-08

Publication date

2019-10-09

2016-02-08 Application filed by Hitachi Zosen Innova AG filed Critical Hitachi Zosen Innova AG

2016-02-08 Priority to PL16154630T priority Critical patent/PL3056811T3/pl

2016-02-08 Priority to EP16154630.4A priority patent/EP3056811B1/de

2016-08-17 Publication of EP3056811A1 publication Critical patent/EP3056811A1/de

2019-10-09 Application granted granted Critical

2019-10-09 Publication of EP3056811B1 publication Critical patent/EP3056811B1/de

Status Active legal-status Critical Current

2036-02-08 Anticipated expiration legal-status Critical

Images

Classifications

- 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
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D15/00—Handling or treating discharged material; Supports or receiving chambers therefor
- F27D15/02—Cooling
- F27D15/0206—Cooling with means to convey the charge
- F27D15/0213—Cooling with means to convey the charge comprising a cooling grate
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D15/00—Handling or treating discharged material; Supports or receiving chambers therefor
- F27D15/02—Cooling
- F27D15/0206—Cooling with means to convey the charge
- F27D15/0266—Cooling with means to convey the charge on an endless belt
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
- F28F13/02—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by influencing fluid boundary
- 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
- 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
- F23L2900/00—Special arrangements for supplying or treating air or oxidant for combustion; Injecting inert gas, water or steam into the combustion chamber
- F23L2900/15041—Preheating combustion air by recuperating heat from ashes
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
- F28D2021/0045—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for granular materials

Definitions

the present invention relates to a method for cooling solid residues of a combustion process according to the preamble of claim 1 and to a conveying device for carrying out this method.
Incinerators for burning solid fuels such as municipal waste, refuse derived fuels, biomass and other materials are well known to those skilled in the art.
Such systems include a combustion chamber in which the solid is burned while supplying so-called primary air.
the solids pass through various sub-processes from the inlet into the combustion chamber to the outlet, which can be subdivided roughly into drying, ignition, combustion and ash burning.
the lumpy residual solids present at the end of the combustion process are referred to as slag in the field of waste incineration.
Another part of solid residues may be present as fly ash, which is deposited by means of filters essentially in a downstream exhaust gas purification, viewed in the direction of flow of the exhaust gases.
the slag is discharged from the waste incineration plant by means of a de-scaling device, which as a rule comprises an intake shaft through which the slag from the combustion chamber falls into a tank filled with water.
the thus deleted slag is then about means ejected corresponding plunger and transported to an interim storage (bunker or container).
a device according to EP-A-0 252 967 which describes a device for continuous, dry Bodenascheabbow comprising a conveyor belt over which a controlled by a valve amount of air is discharged against the direction of the ash removal, so that the heat given off to the air is returned to the combustion chamber.
EP-A-2 665 971 and DE 10 2009 060 305 A1 required gas flow over the ash bed while a relatively large amount of air is introduced into the interior of the corresponding conveyor. In order to prevent an unfavorable for the burn-out and the energy balance temperature reduction in the furnace, but it must be ensured that as little cooling air enters the furnace.
EP-A-2 665 971 proposed a device for cooling of ashes from a firebox, which comprises a conveyor belt, the conveying surface is provided with openings to allow air flow through the conveying surface and the ash bed therethrough. In this way, a more efficient cooling with less air is to be made possible.
the mentioned disadvantages of the prior art in specific a strong dust and an impacted by false air energy balance of the incinerator are to be avoided.
the invention thus relates to a method for cooling of solid residues of a combustion process, which are applied to the conveying surface of a conveyor belt of a conveyor and conveyed towards a solids residue outlet, wherein during the promotion heat from the Residual residues is transferred to a gaseous cooling medium.
the conveyor belt is now loaded with the gaseous cooling medium only on its side facing away from the conveying surface and is substantially impermeable to the cooling medium.
the temperature of the solid residue deposited on the conveying surface is in the range of 200 ° C to 500 ° C, preferably 200 ° C to 300 ° C.
These solids residues are preferably cooled to below 150 ° C during production to the solids residue outlet, more preferably below 100 ° C.
the cooling medium according to the invention is gaseous. As will be explained below, air is preferably used as the cooling medium.
the heat transfer according to the invention or the resulting cooling of the solid particles thus differs fundamentally from technologies in which a liquid spray is used which due to the other material properties, in particular the higher density, compared to a gaseous cooling medium at reasonable cost only very unfavorable can be distributed to the surface to be cooled.
at least part of the cooling medium warmed up by contact with the conveyor belt is extracted on the side facing away from the conveying surface. In other words, the warmed cooling medium is withdrawn from the space below the conveying surface and thus the heat is removed from the system.
the invention is thus based on the fact that the conveyor belt not only serves to convey the solids residues in the direction of the solids residue outlet, but also enables a spatial separation of the solid residues from the cooling medium or from the cooling system for cooling the solids residues.
the conveyor belt for the cooling medium is substantially impermeable and is acted upon only on its side facing away from the conveying surface with cooling medium.
necessary for the cooling cooling medium circulation is accomplished only in a space which is separated from the space in which the solid residues are arranged; a cooling medium-solid mixture is thus avoided according to the invention.
the cooling of the residual solids indirectly, i. can be ensured without direct contact between residual solids and cooling medium, incidentally, as little false air as possible passes through the cooling system in the furnace.
This makes it possible to better control the amount of air supplied to the combustion chamber for the primary combustion and thus the temperature in the combustion chamber, which has a positive influence on the energy balance of the incineration plant.
the heated cooling medium after extraction as heating means for heating the air required for combustion or otherwise use, for example in a neighboring district heating or a different type of energy recovery system.
the cooling medium is gaseous, in particular air. This can potentially corrosion problems, as they can occur in particular when using water as a cooling medium, effectively prevented, whereby the maintenance can be further minimized.
An anhydrous cooling process especially in combination with a dry discharge of slag, has the additional advantage that no water treatment costs are incurred.
a gaseous cooling medium is used.
no liquid spray is used, which according to the teaching of DE 10 2009 060 305 A1 is considered essential.
the resulting from the use of a liquid spray and also in the DE 10 2009 060 305 A1 described problems that the spray must be collected and cleaned before reuse, thus resulting according to the invention not.
the conveyor belt is acted upon by cooling medium via gas nozzle openings, which are arranged at least partially at a distance of less than 30 cm, preferably less than 20 cm, and most preferably less than 10 cm from the surface of the conveyor belt to be acted upon ,
the outlet openings over which the cooling medium is withdrawn, can be arranged at least partially at a similar distance from the surface of the conveyor belt to be acted upon.
the outlet openings are arranged at a distance of less than 30 cm, preferably less than 20 cm, and most preferably less than 10 cm from the surface of the conveyor belt to be acted upon. This ensures that the warmed up cooling medium is extracted early, which ultimately results in an optimized cooling.
the flow path of the cooling medium can be kept low, which avoids that the warmed up cooling medium stays too long in the space on the side facing away from the conveying surface of the conveyor belt and thus could adversely affect the cooling efficiency.
the present invention also relates to a conveying device for carrying out the method.
the conveying device comprises a conveyor belt, preferably an endless conveyor belt, with a conveying surface for conveying solid residues, the conveying device additionally having means for cooling the solids residues, and these means a cooling medium feed for introducing a gaseous cooling medium and a cooling medium discharge for extracting comprise at least a portion of the heated from the solids residues cooling medium.
the conveyor belt is substantially impermeable to the cooling medium.
the cooling medium supply and the necessarilymediumab Installation are designed such that the cooling medium is in contact only with the side facing away from the conveying surface of the conveyor belt.
the cooling medium supply is configured such that the conveyor belt is acted upon with cooling medium only on the side facing away from the conveying surface.
the conveying device also generally comprises an elongate housing which, together with the conveyor belt, encloses a space to which the cooling medium supply and the cooling medium discharge are connected.
the conveying device or the conveying direction F defined by it extends horizontally in its first section, to which an obliquely upward second section adjoins, and the solid residues in particular in the second section Cooling medium to be cooled.
the conveyor belt is an endless conveyor belt, which is guided around at least two rollers and forms a loop with conveying strand and return strand.
the residual solids are taken up on the conveying surface of the conveying strand and conveyed in the conveying direction F.
Such a construction of the conveyor belt is possible, for example, with metal plates that extend over the entire width of the conveyor belt and overlap.
metal plates that extend over the entire width of the conveyor belt and overlap.
plates made of steel are selected.
the most efficient possible sealing of the coolant flowed through by the cooling medium Space under the conveying run can be achieved by a structural design of sheets, which are arranged on the side walls and the edges of the conveying run surmounted such that the gap between these sheets and the conveying strand is kept as small as possible and by this "concealment" a high Flow resistance is achieved.
a simple embodiment comprises ademediumzubuchverteilrohr connected to a cooling medium compressor, via which the cooling medium is distributed in cooling medium supply pipes, which lead either directly or via a feed coupling pipe to a corresponding, arranged in a side wall of the housing cooling medium inlet.
cooling medium removal it is conceivable to conduct the heated cooling medium by means of ademediumabsaugungdemediumauslässe in the side wall either directly or via discharge coupling pipes in correspondingdemediumabbowrohre and then collect in ademediumabbowsammelrohr.
Cooling medium supply on the same side of the conveying device as the cooling medium discharge or else on the respectively opposite side. Accordingly, the Cooling medium inlets and thedemediumauslässe arranged in the same side wall or in the respective opposite side walls.
the space between the conveying run and the return run is separated by a wall running essentially parallel to the conveying run plane, in order to form a space between the conveying run and this wall, and to allocate the cooling medium feed and the cooling medium discharge to this gap.
the space between the conveying run and the return run in the conveying direction can be separated into at least two compartments, wherein the cooling medium supply and / or discharge assigned to the different compartments or connected to the different compartments respectively has at least one valve for controlling the one to be introduced Cooling medium quantity is assigned.
the conveying device is designed for the use of air as a cooling medium.
the cooling medium supply preferably comprises gas nozzles, the openings of which at least partially at a distance of less than 30 cm, preferably less than 20 cm, and most preferably less than 10 cm from the surface to be acted upon Conveyor belts, in particular the underside of the conveyor run, are arranged.
the gas nozzles are in the form of cooling medium supply nozzle tubes. These cooling medium supply nozzle pipes are connected to the cooling medium supply pipes and have nozzle pipe openings in their uppermost area.
a plurality of gas nozzle openings are arranged distributed over the entire width of the conveyor belt, in order to ensure the most even possible application of cooling medium in the width direction.
the gas nozzles are in the form ofmémediumzubowdüsenrohren, they thus preferably extend in a direction transverse to the conveying direction, ie in the width direction of the conveyor belt.
the method and the conveying direction of the present invention are of particular relevance in particular in the field of waste incineration, in particular with regard to the cooling of the slag arising in the furnace at the end of the combustion process.
the present invention thus relates to a waste incineration plant comprising the above-described conveying device.
the waste incineration plant comprises a combustion chamber 2 which is preceded by a refuse feed 4 with a refuse shaft 6 adjoining it.
the combustion chamber 2 comprises a combustion grate 10, which in the embodiment shown is subdivided into four combustion grate sections (not shown) and is supplied with primary air via a primary air supply 11.
a primary air supply line 16 opens and which is intended to supply primary air via corresponding primary air channels through the combustion grate 10 to the fuel bed.
the conveyor device comprises a conveyor belt 38, which is formed in the embodiment shown as an endless conveyor belt, which is guided on support rollers 33 and a conveying strand 30, on the conveying surface 37, the solid residues 32, which are present in a specific case as slag 321, recorded and in the Conveying direction F are promoted, and forms arasttrum 31.
the conveying device runs horizontally in a first section, followed by an obliquely upwardly extending second section, in which the cooling of the slag 321 takes place.
cooling medium is introduced via a cooling medium supply 40 under the conveying surface 37 of the conveyor belt 38.
the cooling medium supply 40 comprises in principle a to ademediumkompressor 44 connecteddemediumzuschreibverteilrohr 41, via which the cooling medium is distributed in cooling medium supply pipes 43 a to 43 d, which in each case optionally, as in particular Fig. 2 shown, lead via a coupling pipe to a corresponding cooling medium inlet 42a to 42h.
the cooling medium discharge comprises cooling medium outlets, via which cooling medium is extracted in each case via cooling medium discharge pipes assigned via a cooling medium outlet.
Thedemediumabbowrohre open into a cooling medium discharge manifold.
the solid-body outlet 17 adjoins the end of the conveyor belt 38 which is viewed in the conveying direction F and, in the embodiment shown, is in the form of a discharge shaft into which the cooled slag 321 is dropped.
the cooling effected according to the invention in the conveying device and corresponding cooling medium feeds and cooling medium discharges are based on the Fig. 2 further illustrated.
the conveyance apparatus 1 includes an elongated housing 39, cooling medium inlets, only two of which cooling medium inlets 42c and 42d are shown, cooling medium outlets, of which only the cooling medium outlet 22c is partially shown, and cooling medium supply nozzle pipes 45a to 45d.
the conveying strand 30 and the return strand 31 of the conveyor belt 38 form a loop, which encloses a space 47 together with the laterally arranged side walls 391 and 392 of the housing 39.
cooling medium supply pipes for example 43b
cooling medium is supplied to the cooling medium supply nozzle pipes 45a to 45d.
the cooling medium is introduced to the conveying surface 37 of the conveyor belt 38 side facing away from the space 47.
Coolant supply nozzle tubes shown in section are generally oriented at right angles to the side wall and are shown in this figure for illustration in slightly distorted perspective.
a supply coupling pipe 46b is formed, which is connected via a cooling medium inlet 42d to four cooling medium supply nozzle pipes 45a to 45d, via which air to the side of the conveyor belt facing away from the conveying surface is introduced.
the cooling medium supply nozzle pipes 45a to 45d are closed at their end facing away from the cooling medium inlet 42d and have four nozzle tube openings 36a to 36d in their uppermost region, via which the cooling medium is distributed over the entire width of the conveyor belt 38.
cooling medium supply pipes are not connected to cooling medium supply nozzle pipes, but merely open into the space 47 via openings at the inlets and thus introduce the cooling medium.
Fig. 4 represents a concrete example of an air supply and corresponds to the Fig. 3 with housing: two cooling medium inlets 42c and 42d arranged in the side wall 392 are connected to a cooling medium supply pipe 43b via a supply coupling pipe 46b.
This construction unit is used in the embodiment of Fig. 1 repeated four times; they are each connected to the samedemediumzubowverteilrohr 41, via which a cooling medium compressor 44 feeds the cooling medium into the space 47 below the delivery.

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Engineering & Computer Science (AREA)
Mechanical Engineering (AREA)
General Engineering & Computer Science (AREA)
Physics & Mathematics (AREA)
Thermal Sciences (AREA)
Gasification And Melting Of Waste (AREA)
Processing Of Solid Wastes (AREA)
Structure Of Belt Conveyors (AREA)
Belt Conveyors (AREA)

EP16154630.4A 2015-02-10 2016-02-08 Verfahren zur kühlung von feststoffrückständen eines verbrennungsprozesses Active EP3056811B1 (de)

Priority Applications (2)

Application Number	Priority Date	Filing Date	Title
PL16154630T PL3056811T3 (pl)	2015-02-10	2016-02-08	Sposób chłodzenia pozostałości materiałów stałych procesu spalania
EP16154630.4A EP3056811B1 (de)	2015-02-10	2016-02-08	Verfahren zur kühlung von feststoffrückständen eines verbrennungsprozesses

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
EP15000394		2015-02-10
EP16154630.4A EP3056811B1 (de)	2015-02-10	2016-02-08	Verfahren zur kühlung von feststoffrückständen eines verbrennungsprozesses

Publications (2)

Publication Number	Publication Date
EP3056811A1 EP3056811A1 (de)	2016-08-17
EP3056811B1 true EP3056811B1 (de)	2019-10-09

Family

ID=52469578

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP16154630.4A Active EP3056811B1 (de)	2015-02-10	2016-02-08	Verfahren zur kühlung von feststoffrückständen eines verbrennungsprozesses

Country Status (7)

Country	Link
US (1)	US10190770B2 (ja)
EP (1)	EP3056811B1 (ja)
JP (1)	JP6645860B2 (ja)
AU (1)	AU2016200834B2 (ja)
CA (1)	CA2919936C (ja)
ES (1)	ES2764661T3 (ja)
PL (1)	PL3056811T3 (ja)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
CN107676771B (zh) *	2017-02-28	2023-08-04	浙江浙燃能源有限公司	一种强化燃烧系统

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2016
- 2016-02-04 CA CA2919936A patent/CA2919936C/en active Active
- 2016-02-08 EP EP16154630.4A patent/EP3056811B1/de active Active
- 2016-02-08 ES ES16154630T patent/ES2764661T3/es active Active
- 2016-02-08 PL PL16154630T patent/PL3056811T3/pl unknown
- 2016-02-09 AU AU2016200834A patent/AU2016200834B2/en active Active
- 2016-02-09 JP JP2016022837A patent/JP6645860B2/ja active Active
- 2016-02-10 US US15/040,806 patent/US10190770B2/en active Active

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Also Published As

Publication number	Publication date
JP6645860B2 (ja)	2020-02-14
US20160230990A1 (en)	2016-08-11
JP2016148509A (ja)	2016-08-18
US10190770B2 (en)	2019-01-29
CA2919936A1 (en)	2016-08-10
PL3056811T3 (pl)	2020-04-30
EP3056811A1 (de)	2016-08-17
ES2764661T3 (es)	2020-06-04
AU2016200834A1 (en)	2016-08-25
CA2919936C (en)	2023-06-27
AU2016200834B2 (en)	2020-09-10

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