WO2010023119A2 - Verfahren und vorrichtung zum fördern von verbrennungsrückständen - Google Patents
Verfahren und vorrichtung zum fördern von verbrennungsrückständen Download PDFInfo
- Publication number
- WO2010023119A2 WO2010023119A2 PCT/EP2009/060565 EP2009060565W WO2010023119A2 WO 2010023119 A2 WO2010023119 A2 WO 2010023119A2 EP 2009060565 W EP2009060565 W EP 2009060565W WO 2010023119 A2 WO2010023119 A2 WO 2010023119A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- fluid
- housing
- combustion residues
- conveying
- treatment device
- Prior art date
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
- 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
- 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
-
- 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
- F23J2900/01006—Airlock sealing associated with ash removal means
-
- 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
- F23J2900/01009—Controls related to ash or slag extraction
Definitions
- the present invention relates to a method and a device for conveying combustion residues in a conveyor along a conveying path from a combustion chamber.
- the invention finds particular application in the combustion of fossil fuels and / or waste incineration plants.
- combustion residues When removing the slag, ash, soot and the like, hereinafter referred to as "combustion residues", it is of particular importance to achieve on the one hand targeted solidification or solidification of the hot, partially still melted materials, so that in particular a promotion or further processing of this In addition, it is also desirable to use the energy still present in the hot material and thus to improve the overall efficiency of the plant or of the combustion boiler.
- the hot material is placed on conveyor belts and transported there further, wherein optionally an afterburning or targeted cooling of the hot material is also partly carried out on the conveyor belt.
- the materials used in this case, in particular the conveyor belt must withstand the high temperatures, the corrosive environment and / or the high mechanical load.
- These conveyor belts are regularly encapsulated in relation to the external environment, that is to say they have a housing which prevents combustion gases, which are still generated during the treatment of the material, from readily escaping into the environment.
- the combustion boilers operated mainly with a slight negative pressure, so that the combustion gases produced by the material are drawn off by a corresponding suction to the combustion boiler.
- EP 0 471 055 Bl for an energetically useful extraction device which is specially equipped with regard to the cooling behavior.
- it makes sense to cool the hot material in two separate cooling stages with an intermediately stored comminution step for the hot material.
- a cooling air flow is to be realized according to the counter-current principle, which is provided at the end of the second cooling stage and at the end of the first cooling stage.
- the object of the present invention is therefore to at least partially solve the problems resulting from the prior art and, in particular, to provide a method and a device with which an improved removal of combustion residues is achieved.
- the method should enable trouble-free operation of the conveying device and / or the treatment device (eg a crusher). With the device should also be simple design and a cost-effective retrofitting of known systems can be achieved.
- the inventive method for conveying combustion residues in a conveying direction along a conveying path from a combustion chamber comprises the following steps: a) conveying the combustion residues from a combustion chamber by means of a conveyor having at least one housing; b) generating a first pressure level in the housing; c) aftertreatment of the combustion residues in a treatment device arranged in the conveying path; d) generating a second pressure level in the conveying direction of the combustion residues behind the treatment device by introducing a fluid to form a pressure gradient.
- Step a) relates in particular to the task of combustion residues on a conveyor belt, which is arranged in the housing of the conveyor.
- the housing encapsulates the conveyor belt and the combustion residues transported in it against the environment.
- a first pressure level is now set during the operation of the device (step b)).
- the combustion boiler operated with negative pressure will provide, if necessary, this negative pressure can be adjusted by additional suction units, air additions and / or blowers.
- a subsequent treatment of the combustion residues takes place in a treatment device arranged in the conveying path.
- the conveying path leads through the treatment device, which forms a supply bottleneck.
- the treatment device may in this case be e.g. a crusher, hammers, grinders, flaps, sieves or the like.
- step d) should now be achieved that either certain portions of the combustion residues do not penetrate into the treatment facility and / or the funded by the treatment facility combustion residues are safely removed and not reenter the treatment facility and thus the funding bottleneck.
- the first pressure level may correspond to the negative pressure of a combustion chamber which is connected to the housing of the conveyor.
- a supply of air into the housing is allowed to supply the combustion chamber with air, so that it can flow into the combustion chamber after flowing through the housing.
- the negative pressure of the first pressure level frequently produces a state in which combustion residues already conveyed through the treatment device are conveyed in the opposite direction to the conveying direction.
- the treatment device is designed, for example, as a comminution device for relatively large combustion residues, there is a risk that this comminution device will have malfunctions due to deposits of combustion residues after a relatively short time.
- a fluid which may preferably comprise at least air, water or water vapor, wherein by means of a Venturi effect, a negative pressure is generated, which forms a second pressure level behind the treatment device. If one now ensures that the second pressure level is lower than the first pressure level, a pressure gradient results, which points from the input side of the treatment device to the outlet side of the treatment device and thus in the conveying direction, whereby it can always be ensured under all operating conditions that no combustion residues, such as ash or vapors, are sucked back into the treatment facility.
- the first pressure level preferably corresponds to the negative pressure of the combustion chamber and the second pressure level corresponds to a lower pressure to generate a suction effect in the direction of the conveying direction of the combustion residues.
- the conveying direction is defined by the travel of the combustion residues in the conveying device.
- the second pressure level between 20 to 600 mbar, preferably between 80 to 150 mbar lower than the first pressure level is set.
- These pressure levels have proven to be sufficient and can also be produced in a technically simple manner, for example. With nozzle means.
- the fluid at a speed of at least 4 m / sec, preferably from at least 10 m / sec is initiated.
- Higher speeds can be generated in particular with nozzle means, with the aid of an exit velocity of the fluid can be controlled from the nozzle means.
- the fluid is supplied at a pressure of 4 to 10 bar.
- the supply of the fluid can be done either in direct form or with the interposition of a nozzle means.
- One of the advantages of this pressure range is that a pressure of 4 to 10 bar can be provided inexpensively by simple means and at the same time offers a sufficient pressure level for a downstream acceleration of the fluid with nozzle means.
- these pressures are based on the ambient air pressure or the pressure on the outlet side of the nozzle means.
- At least the first pressure level, the second pressure level, a temperature or a fluid content in the housing is detected.
- This can be done, for example, with measuring means, which are arranged at least in front of, in or behind the treatment device.
- pressure sensors arranged in front of and behind the treatment device, the correct setting of the desired pressure gradient can be monitored.
- Such countermeasures can include, for example, a control of the fluid supply, the air supply and / or a return of gaseous and fumigant combustion residues.
- the negative pressure of the second pressure level can be increased and a return of the combustion residues counteracted.
- the first pressure level can be raised, so that the negative pressure formed there is reduced, which also counteracts a return of the combustion residues counter to the conveying direction.
- the fluid supply can be completely interrupted if, despite all measures, the risk of a return of the fluid and the combustion residues.
- a fluid barrier is generated.
- nozzle means for generating a fluid barrier in the conveying direction downstream at least in the housing or at a housing outlet.
- a fluid barrier can, for example, consist of a (hot) air flow or a liquid flow which is similar to a sprayed liquid curtain.
- an inlet direction of the fluid entering the housing is selected such that it has at least one directional component in the conveying direction of the combustion residues.
- the inlet direction of the fluid can be divided into different (preferably orthogonal) directional components, which, when combined, result in the direction of entry. If at least one directional component lies in the direction of the conveying direction, this supports the transport of the combustion residues. In particular, this is the case when the inlet direction of the fluid has an angle between 10 ° and 80 ° with respect to the conveying direction. In particular, such angles, which correspond, for example, 30 ° - 60 °, are advantageous because they simultaneously generate a fluid flow, which causes the desired negative pressure and the fluid flow due to its kinetic energy, the promotion of combustion residues additionally supported.
- the device proposed by the invention for conveying combustion residues along a conveying path with a conveying device has at least one housing and a treatment arranged in the conveying path. treatment device for the treatment of combustion residues.
- at least one nozzle means for introducing a fluid into the housing and the fluid is accelerated when flowing through the nozzle means for generating a second pressure level in the conveying direction behind the treatment device, solves the task of the invention also.
- a second pressure level in the conveying direction is set, in particular in the manner described above, which is effectively lower than the first pressure level and thus forms a pressure gradient.
- the negative pressure generated by the introduced fluid thus ensures a constant delivery of combustion residues in the conveying direction, whereby the reliability of the device is significantly improved.
- a nozzle means here in particular a system with several in the housing with a distance to the treatment unit is used.
- the nozzles may be designed with a common fluid supply, so that e.g. a pump needs-oriented (in terms of time and amount) introduces the fluid through the nozzle into the housing.
- the distance to the treatment unit is in particular in a range of less than 5 m, preferably even less than 2 m or even in the range of 20 cm to 1 m. It is further preferred that an arrangement of the nozzle distributed over the circumference of the housing is made, in which case a uniform distribution is not mandatory here.
- the arrangement of the nozzles is preferably carried out in a horizontal plane.
- the nozzle means are adapted to accelerate the fluid (especially water) so that the fluid enters the housing at a sufficiently high velocity to generate suction therefrom away from the treatment device.
- the housing in the conveying direction behind (downstream) the nozzle means conduit means for an at least partial recycling of gaseous and smoky combustion residues in the combustion chamber are provided.
- the nozzle means conduit means for an at least partial recycling of gaseous and smoky combustion residues in the combustion chamber are provided.
- At least one measuring means is arranged at least in the conveying direction in front of or behind the treatment device, that is connected to a control device for controlling the fluid supply, the air supply and / or recirculation with control or regulating means ,
- the arrangement of at least one measuring means for measuring moisture in front of the nozzle means or in front of or in the treatment device enables reliable monitoring as to whether combustion residues and / or fluid are fed back against the conveying direction. If such a state is detected, the appropriately programmed control device, which is, for example, a programmable electronic control device, can execute corresponding control or regulating measures.
- control device is designed to determine a pressure gradient.
- a controlled adjustment or regulation can also take place as a function of the at least one pressure gradient. For example, if the pressure gradient drops below a predetermined threshold, the controller may take appropriate countermeasures to increase the pressure gradient to the desired level, or institute protective measures for the safety of the device and the operator.
- an air inlet is provided on the housing in the conveying direction before the treatment device.
- the air supply to the combustion chamber and thus the first pressure level in the housing can be influenced.
- the invention finds particular application in combination with one of the following boiler plants: Boiler plant for the improvement of fossil fuels (coal, lignite, ...), waste incineration plants, etc., these preferably being operated with the methods described herein according to the invention and / or equipped with the device according to the invention is. If necessary, this concept can also be applied to other conveyor systems that are subject to a production bottleneck (eg, a mill or a crusher type).
- FIG. 1 shows schematically a device according to the invention for conveying combustion residues, which is also suitable for carrying out the method according to the invention.
- a combustion chamber 1 is shown, are burned in the fossil fuels or waste.
- a conveyor 2 is arranged, which consists of conveyor belts 3, housing 4 and a treatment device 5 arranged in the conveying path.
- the combustion residues 6 are transported along the conveying direction 7, wherein they emerge after passing through the treatment device 5, which is designed as a shredding device 8, at a housing outlet 9.
- the part of the housing 4 between the combustion chamber 1 and the treatment device 5 can also be referred to as the first housing section and the part of the housing 4 after the treatment device as the second housing section, whereby these can also be designed separately.
- an air inlet 10 is provided, can flow through the air in the direction of the arrow 11 in the housing 4, from where it passes into the combustion chamber 1, which is operated with a slight negative pressure.
- a first pressure level 12 In this area of the housing 4 there is a first pressure level 12.
- a second pressure level 13 In the area behind (downstream) of the treatment facility 5, there is a against a second pressure level 13, which is characterized by a lower pressure than the first pressure level 12.
- the second pressure level 13 is generated by introducing fluid 14 (water) through nozzle means 15 in a region below the treatment device 5.
- the nozzle means 15 are inclined at an angle ⁇ relative to the conveying direction 7 provided at this position.
- the fluid 14 issuing from the nozzle means 15 simultaneously generates a negative pressure and conveys the combustion residues 6 in the direction of the housing outlet 9 due to the flow direction of the fluid.
- further nozzle means 15 are provided from which a fluid 14 emerges. to create a fluid barrier 16.
- z. B. prevents the unwanted leakage of smoke and gas from the housing 4.
- Such undesirable constituents of the combustion residues can be recycled via a return, which opens into the combustion chamber 1 via a conduit 18 by means of a valve 17.
- a control device 19 is provided, which is connected via control lines 20 simultaneously with the air inlet 10, the valve 17, the nozzle means 15 and measuring means 21.
- the measuring means 21 may be formed, for example, for detecting pressure and moisture. If water is used as the fluid 14, it can be detected immediately with the aid of the measuring means 21 if this fluid were transported counter to the conveying direction in the direction of the treatment device 5 or even through it. In addition, monitoring of a pressure gradient between a front side 22 and a rear side 23 of the treatment device 5 can be monitored very accurately in a design of the measuring device 21 for pressure detection. If the pressure gradient between the front side 22 and the rear side 23 decreases undesirably, the pressure level 12 can be raised by additional air 11 or the second pressure level 13 can be lowered by introducing additional fluid 14, optionally with individual or combined measures. In addition, it is possible to lower the second pressure level 13 in addition by the return of combustion residues through the conduit means 18. With the device thus executed, it is possible to ensure a permanent and trouble-free operation of the treatment device 5.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Gasification And Melting Of Waste (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/059,158 US20110203534A1 (en) | 2008-08-28 | 2009-08-14 | Method and device for conveying combustion residues |
CN2009801332228A CN102317688A (zh) | 2008-08-28 | 2009-08-14 | 燃烧残渣的传送方法和传送设备 |
EP09781866A EP2324289A2 (de) | 2008-08-28 | 2009-08-14 | Verfahren und vorrichtung zum fördern von verbrennungsrückständen |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102008044709A DE102008044709A1 (de) | 2008-08-28 | 2008-08-28 | Verfahren und Vorrichtung zum Fördern von Verbrennungsrückständen |
DE102008044709.9 | 2008-08-28 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2010023119A2 true WO2010023119A2 (de) | 2010-03-04 |
WO2010023119A3 WO2010023119A3 (de) | 2012-02-09 |
Family
ID=41258443
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2009/060565 WO2010023119A2 (de) | 2008-08-28 | 2009-08-14 | Verfahren und vorrichtung zum fördern von verbrennungsrückständen |
Country Status (5)
Country | Link |
---|---|
US (1) | US20110203534A1 (de) |
EP (1) | EP2324289A2 (de) |
CN (1) | CN102317688A (de) |
DE (1) | DE102008044709A1 (de) |
WO (1) | WO2010023119A2 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010033307A1 (de) * | 2010-08-04 | 2012-02-09 | Clyde Bergemann Drycon Gmbh | Vorrichtung und Verfahren zum Nachverbrennen von heißem Material auf einem Förderer |
DE102011101390A1 (de) * | 2011-05-13 | 2012-11-15 | Clyde Bergemann Drycon Gmbh | Verfahren und Vorrichtung zum Betreiben einer Fördereinrichtung für ein Abbrandprodukt |
CN102444897B (zh) * | 2011-09-16 | 2013-12-25 | 山东电力工程咨询院有限公司 | 火力发电厂高浓度灰渣处理系统 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0471055B1 (de) | 1990-03-02 | 1995-07-26 | MAGALDI, Mario | Kessel zur Erzeugung von Dampf und Verfahren zum Auslass von Asche |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE526860C (de) * | 1928-10-30 | 1931-06-11 | Goerlitzer Maschinenfabrik | Verfahren und Vorrichtung zum Entaschen von Feuerungsanlagen mittels Druckfoerderrohren |
GB356733A (en) * | 1929-04-22 | 1931-09-03 | Thomas Gerald Coghlan | Improvements in and relating to the handling of furnace residues |
US1957583A (en) * | 1931-08-07 | 1934-05-08 | Westinghouse Electric & Mfg Co | Combustion apparatus |
GB398062A (en) * | 1932-07-02 | 1933-09-07 | Anton Rothstein | Method of and means for removing the ash from the collecting hoppers below the fluesof boiler plants and other ash collecting devices |
ITMI20041371A1 (it) * | 2004-07-09 | 2004-10-09 | Magaldi Power Spa | Sistema integrato di estrazione ceneri pesanti trasformazione delle stesse in ceneri leggere e riduzione degli incombusti |
BRPI0621955A2 (pt) * | 2006-08-22 | 2011-12-20 | Magaldi Power Spa | sistema para extrair e resfriar a seco resìduos de combustão do tipo apto para ser usado em associação com uma cámara de combustão e método para extrair e resfriar a seco resìduos de combustão provenientes de uma cámara de combustão |
US20100294457A1 (en) * | 2006-08-22 | 2010-11-25 | Mario Magaldi | Extraction and air/water cooling system for large quantities of heavy ashes |
-
2008
- 2008-08-28 DE DE102008044709A patent/DE102008044709A1/de not_active Withdrawn
-
2009
- 2009-08-14 US US13/059,158 patent/US20110203534A1/en not_active Abandoned
- 2009-08-14 CN CN2009801332228A patent/CN102317688A/zh active Pending
- 2009-08-14 WO PCT/EP2009/060565 patent/WO2010023119A2/de active Application Filing
- 2009-08-14 EP EP09781866A patent/EP2324289A2/de not_active Withdrawn
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0471055B1 (de) | 1990-03-02 | 1995-07-26 | MAGALDI, Mario | Kessel zur Erzeugung von Dampf und Verfahren zum Auslass von Asche |
Also Published As
Publication number | Publication date |
---|---|
CN102317688A (zh) | 2012-01-11 |
DE102008044709A1 (de) | 2010-03-04 |
EP2324289A2 (de) | 2011-05-25 |
WO2010023119A3 (de) | 2012-02-09 |
US20110203534A1 (en) | 2011-08-25 |
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