• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    In a device for conveying pneumatically conveyed fuels, in particular solid secondary fuels in burners for rotary kilns, comprising a central conveyor pipe (1) having an open end with an outlet opening (2) for the pneumatically conveyed fuels and an opposite end portion in which the Fuels are the conveyor pipe (1) abandoned, the outlet opening of the conveying pipe (1) opens adjacent at least one connected to an air supply line (6, 7, 9) directed obliquely forward into the interior of the conveying tube (1).
    公开号:AT510439A4
    申请号:T17982010
    申请日:2010-10-29
    公开日:2012-04-15
    发明作者:
    申请人:Unitherm Cemcon Feuerungsanlagen Ges M B H；
    IPC主号:
    专利说明:

    " * · · ""· - 1 -
    The invention relates to a device for conveying pneumatically conveyed fuels, in particular solid secondary fuels in burners for rotary kilns, comprising a central conveyor pipe having an open end with an outlet for the pneumatically conveyed fuels and an opposite end, in which the fuels abandoned the conveyor tube become .
    Furthermore, the invention relates to a burner for rotary kilns with a burner nozzle comprising at least one combustion air duct, at least one channel for the supply of highly reactive fuel, a channel for the supply of less reactive fuel, wherein the channel for the supply of the higher reactive fuel radially outside the Channel is arranged for the supply of the less reactive fuel, and a device for conveying the pneumatically promoted less reactive fuel, in particular of solid secondary fuels.
    Such burners are used to heat relatively large amounts of material in a short time to high temperature. Burners, which are used in rotary kilns, project from a front side of the rotary kiln lance in the interior thereof to produce a flame which extends substantially along the axis of the rotary kiln. In order to be able to set a desired temperature profile within the furnace, the greatest possible adjustability of the flame shape is also desired during operation. Furthermore, burners for rotary kilns increasingly with inferior, less reactive solid fuels such. B. operated with combustible waste products. Such less reactive fuels, also called secondary fuels, • «*» *
    For example, * * · · consist of paper, cardboard, plastic waste, wood or bone and have a calorific value of between 2,500 and 8,000 Kcal. These secondary fuels are crushed and usually have a piece size between 2miri and 10cm. The recycled secondary fuels are stored in a silo and conveyed pneumatically to the burner. In certain operating conditions, this leads to flame carry-over and delayed burnout due to 02 deficiency. As a result, process engineering problems arise in the rotary kiln, such as, for example, a shift in the sintering zone, reduced clinker firing or increased inlet temperatures at the kiln inlet.
    In particular, it can be observed in the known burners that the less reactive fuel or the secondary fuel can not be completely burned. The reason for this is that in the known rotary kiln burners, the secondary fuels are supplied centrally, as can be taken for example from EP 967 434 Al. The higher reactive fuel such as dusty coal, also called primary fuel, in this case forms a mantle to the less reactive fuel, wherein the combustion air is introduced partly as the pulverized coal surrounding primary air and partly as hot secondary air. The combustion process takes place in such a way that a flame is formed by the primary fuel, which ensures the ignition and combustion of the solid secondary fuels. In the conventional design, the primary fuels are usually supplied via an annular channel. In the center of the burner are one or more delivery pipes, through which various solid fuels are given up. • Φ «·» Μ Μ Μ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * Delivery pipes are usually simple pipes which, due to abrasion problems, lead as straight as possible from the connection of the delivery line to the burner outlet. The injection of solid fuel into the combustion chamber takes place by means of pneumatic conveying. Usually, the fuel particles pass out of the burner in the direction of the delivery pipe axis.
    The present invention now aims to increase the flame residence time of the particles to thereby achieve better burnout of the solid fuel.
    To achieve this object, the invention provides in a device of the type mentioned above, that the outlet opening of the delivery pipe adjacent at least one line connected to an air supply line opens obliquely forward into the interior of the delivery pipe. &Quot; Front " in this case denotes that end of the conveying tube which has the outlet opening. The air blown in via the at least one line thereby generates an air flow obliquely to the conveying direction, i. obliquely to the axis of the conveyor tube, whereby the fuel particles passing through the air flow experience a corresponding pulse, which changes the trajectory of the fuel particles. The fuel particles thus no longer leave the conveying tube parallel to the conveying axis, but are ejected obliquely to the conveying axis. In particular, it is possible with the formation of the invention to change the trajectory of the fuel particles to the extent that they penetrate the support flame of the primary fuels in a kind of oblique litter. This increases the residence time in the flame as well as the throw distance. This results in better burning of the solid fuels and thus an improved quality of the product. 4M ················································································. * * • * · · · · · w * · * * · ····· «·« «* - 4 - ces. The result is a reduced heat requirement and a reduction in emissions. Another advantage of this design is that it works entirely without mechanical components and thus there is no increased wear as described e.g. when using guide and guide plates would be the case.
    In a structurally particularly simple manner, the at least one line is preferably formed by an opening formed in the conveyor tube. The at least one opening extends obliquely through the wall of the conveyor tube and preferably has the same cross section over its entire length. Alternatively, it is also conceivable that the cross section of the opening tapers or widened towards the interior of the delivery tube. The at least one aperture may have a circular cross-section or be formed as a circumferentially extending slot.
    In order to ensure a common air supply in a simple manner, especially in the case of a plurality of lines opening obliquely forwardly into the interior of the delivery pipe, a preferred embodiment provides for an air chamber, at least partially surrounding, provided with an air supply, to be disposed above the pipes at least one conduit communicates with the interior of the production tubing. The air chamber can feed all lines or openings at the same time, so that everywhere the same air supply pressure is available. The air chamber may be formed as an annular chamber surrounding the conveying tube, which is preferably bounded radially inward by the conveying tube and radially outward by a tube arranged concentrically with the conveying tube. * * * * * * T * * • »* * * · · · ·« »• · · - -
    In order to ensure that the fuel delivery flow is obliquely deflected in a plurality of lines connected with an air supply, which open obliquely forwardly into the interior of the delivery pipe, the lines open only in one through a central angle of less than 180 ° smaller than 120 ° defined peripheral region of the conveying tube in the interior of the conveying tube. The lines or openings are thus arranged only in a half pipe. Although it is conceivable that the outlet direction of the individual lines diverge, it is preferred if the outlet directions of the individual lines run parallel to each other.
    If, as this corresponds to a further preferred development, the air supply has means for adjusting the supply pressure, the intensity of the deflection of the fuel particles can be influenced via the variation of the pressure. This also makes it possible to adapt the effect to different environmental conditions as well as to different fuels.
    Finally, it is preferred if the air supply for the at least one line is different from the air supply for the pneumatic delivery of the fuels. As a result, independent air supplies are ensured in each case, wherein the air supply for the air introduced obliquely into the interior of the delivery tube, e.g. can be done via the primary air supply of the burner.
    Although in the context of the invention air is the preferred medium, it should be noted in principle that the deflection of the fuel particles to be achieved according to the invention is also accompanied by ··· «* *
    Other gaseous media succeed without departing from the scope of the invention.
    The invention is explained in more detail below with reference to exemplary embodiments shown schematically in the drawing, in which Fig.l shows a longitudinal section through a first embodiment of the device according to the invention, Figure 2 shows a cross section along the line II-II of Fig.l, Fig.3 a longitudinal section through a second embodiment of the device according to the invention and Figure 4 shows a cross section along the line IV-IV of Figure 3.
    In Fig.l a delivery pipe 1 can be seen. In the conveying pipe is fed to a not shown in Fig.l position, namely at the opposite end of the outlet opening 2 of the conveying tube 1, from a reservoir pneumatically funded solid secondary fuel. At the burner mouth or outlet opening 2, the secondary fuel is blown into the flame center together with the conveying air. In the region of the burner mouth an air chamber 3 is mounted, which is bounded for reasons of space radially inward from the conveying pipe 1 and radially outward from a coaxial air pipe 4, so that the air chamber surrounds the conveying pipe 1. The air chamber 3 is supplied with air or another suitable gaseous medium according to the arrow 5. The air chamber 3 is connected via slot-shaped openings 6 and 7 with the interior of the conveying tube 1. In the embodiment according to FIG. 1, the slot-shaped openings 6 and 7 are arranged one behind the other in the axial direction. The slot-shaped openings 6 and 7 are aligned obliquely forward and close with the axial direction of the conveying pipe or with the conveying direction of the pneumatically conveyed secondary fuels an angle α, wherein the angle "I *»
    is the same at both slit-shaped openings 6 and 7. The angle α is preferably 20-75 °, in particular 45-65 °. In the cross-sectional view according to Figure 2 it can be seen that the slot-shaped opening 6 extends over a larger central angle ß than the slot-shaped opening 7. In any case, the slot-shaped openings 6 and 7 are only on the tube half shown in the drawing below, to a uniform To ensure impulse loading of the fuel particles. The trajectory of the secondary fuel particles is indicated by 8 and it can be seen that the fuel particles are deflected by the blown through the openings 6 and 7 air, so they go through a kind of trajectory.
    The second embodiment shown in FIGS. 3 and 4 differs from the first embodiment only in that the openings are designed as simple holes 9 in the conveyor tube 1. The bores 9 close in longitudinal section all the same angle α with the longitudinal axis 10 of the conveyor pipe 1 a. In the cross section according to Figure 4, the holes 9 are parallel to each other, the mouths of the holes 9 are arranged only over a defined by a central angle ß peripheral region.
    权利要求:
    Claims (11)
    [1]
    • * * ··· * * «« 9 • * 4 ** · I 9 · * »• · ·« - «9 *« * ♦ 9 · 9 9 * 99 9 ·· * «··· * 99 8. Apparatus for conveying pneumatically conveyed fuels, in particular solid secondary fuels in burners for rotary kilns, comprising a central conveying pipe (1) having an open end with an outlet opening (2) for the pneumatically conveyed fuels and an opposite end portion in which the fuels are fed to the conveying pipe (1), characterized in that the outlet opening (2) of the conveying pipe (1) adjacent at least one with an air supply in communication line (6,7,9) directed obliquely forward the interior of the delivery pipe (1) opens.
    [2]
    2. Device according to claim 1, characterized in that the at least one line (6, 7, 9) is formed by a passage formed in the conveying tube (1).
    [3]
    3. Apparatus according to claim 1 or 2, characterized in that the conveying pipe (1) at least partially surrounding, provided with an air supply air chamber (3) is arranged, via the at least one line (6,7,9) with the interior the delivery pipe (1) is in communication.
    [4]
    4. Apparatus according to claim 1, 2 or 3, characterized in that the air outlet of the at least one line (6,7,9) to the outlet opening (2) of the conveying tube (1) is oriented towards.
    [5]
    5. Apparatus according to claim 2, 3 or 4, characterized in that the opening (9) has a circular cross-section. ** Ψ I * · · «* Μ« | • * Ι »· 4 · 4 4 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · III III III III III III III III III III ·· - 9 -
    [6]
    5. Apparatus according to claim 2, 3 or 4, characterized in that the opening (6,7) is formed as in the circumferential direction extending slot.
    [7]
    7. Device according to one of claims 1 to 6, characterized in that a plurality of associated with an air supply lines (6,7,9) directed obliquely forward into the interior of the conveying tube (1) opens, wherein the lines ( 6, 7, 9) open into the interior of the delivery tube (1) only in a circumferential region of the delivery tube (1) defined by a central angle (β) of less than 180 °, preferably less than 120 °.
    [8]
    8. Device according to one of claims 1 to 7, characterized in that the outlet direction of the lines (9) parallel to each other.
    [9]
    9. Device according to one of claims 1 to 8, characterized in that the air supply comprises means for adjusting the supply pressure.
    [10]
    10. Device according to one of claims 1 to 9, characterized in that the air supply for the at least one line is different from the air supply for the pneumatic conveying of the fuels.
    [11]
    A burner for rotary kilns having a burner nozzle comprising at least one combustion air channel, at least one channel for the supply of higher reactive fuel, a channel for the supply of less reactive fuel, wherein the channel for the supply of the higher reactive fuel radially outside the channel for the Supply of the less reactive fuel is arranged, and an apparatus according to any one of claims 1 to 10 for promoting the «4« · »i« «« < - 10 one of claims 1 to 10 for conveying the pneumatically funded less reactive fuel, in particular of solid secondary fuels. Applicant by: Vienna, 29 October 2010 HaffnerOhnd Keschmann

    10
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    同族专利:
    公开号 | 公开日
    AT510439B1|2012-04-15|
    EP2633235A1|2013-09-04|
    WO2012054949A1|2012-05-03|
    EP2633235B1|2015-08-05|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    CN102901346A|2012-10-23|2013-01-30|中冶长天国际工程有限责任公司|Secondary air system of rotary kiln and using method of secondary air system|GB342797A|1929-11-12|1931-02-12|Clarke Chapman Ltd|Improvements in or relating to burners for furnaces fired with pulverised, liquid or gaseous fuel|
    US4043746A|1974-09-19|1977-08-23|Polysius Ag|Method for the heat treatment of fine-grained materials containing alkali compounds|
    GB1590341A|1977-07-25|1981-06-03|Fredrick W L|Apparatus and methods for enhancing combustibility of solid fuels|
    US4414026A|1981-07-30|1983-11-08|Nippon Kokan Kabushiki Kaisha|Method for the production of ferrochromium|
    SU1361431A1|1986-06-18|1987-12-23|Институт Геологии И Геохимии Горючих Ископаемых Ан Усср|Incinerator|
    FR2727744A1|1994-12-02|1996-06-07|Donze Michel|Solid fuel burner and installation|
    FR2780489B1|1998-06-24|2000-09-08|Pillard Chauffage|IMPROVEMENT IN BURNERS COMPRISING AT LEAST THREE AIR SUPPLY DUCTS, OF WHICH TWO AXIAL AND ROTATING, CONCENTRIC WITH AT LEAST ONE FUEL-SUPPLY, AND A CENTRAL STABILIZER|
    CA2445818C|2003-07-04|2009-12-22|Holcim Ltd.|Method and system for process gas entrainment and mixing in a kiln system|DE102014012464A1|2014-08-21|2016-02-25|Messer Austria Gmbh|Heating a furnace space using a multi-fuel burner|
    法律状态:
    2017-06-15| MM01| Lapse because of not paying annual fees|Effective date: 20161029 |
    优先权:
    申请号 | 申请日 | 专利标题
    AT17982010A|AT510439B1|2010-10-29|2010-10-29|DEVICE FOR CONVEYING PNEUMATICALLY SUPPORTED FUELS|AT17982010A| AT510439B1|2010-10-29|2010-10-29|DEVICE FOR CONVEYING PNEUMATICALLY SUPPORTED FUELS|
    EP11785564.3A| EP2633235B1|2010-10-29|2011-10-31|Device for conveying pneumatically conveyed fuels|
    PCT/AT2011/000442| WO2012054949A1|2010-10-29|2011-10-31|Device for conveying pneumatically conveyed fuels|
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