ES2373562T3 - Coal burner powder low nox emissions. - Google Patents

Coal burner powder low nox emissions. Download PDF

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Publication number
ES2373562T3
ES2373562T3 ES06013706T ES06013706T ES2373562T3 ES 2373562 T3 ES2373562 T3 ES 2373562T3 ES 06013706 T ES06013706 T ES 06013706T ES 06013706 T ES06013706 T ES 06013706T ES 2373562 T3 ES2373562 T3 ES 2373562T3
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Spain
Prior art keywords
air duct
burner
primary air
primary
mouth
Prior art date
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Application number
ES06013706T
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Spanish (es)
Inventor
Heinz Gräwe
Alfons Leisse
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Hitachi Power Europe GmbH
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Hitachi Power Europe GmbH
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Filing date
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Priority to DE102005032109 priority Critical
Priority to DE102005032109A priority patent/DE102005032109B4/en
Application filed by Hitachi Power Europe GmbH filed Critical Hitachi Power Europe GmbH
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Publication of ES2373562T3 publication Critical patent/ES2373562T3/en
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23DBURNERS
    • F23D1/00Burners for combustion of pulverulent fuel
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23CMETHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C7/00Combustion apparatus characterised by arrangements for air supply
    • F23C7/002Combustion apparatus characterised by arrangements for air supply the air being submitted to a rotary or spinning motion
    • F23C7/004Combustion apparatus characterised by arrangements for air supply the air being submitted to a rotary or spinning motion using vanes
    • F23C7/006Combustion apparatus characterised by arrangements for air supply the air being submitted to a rotary or spinning motion using vanes adjustable
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23DBURNERS
    • F23D2201/00Burners adapted for particulate solid or pulverulent fuels
    • F23D2201/10Nozzle tips
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23DBURNERS
    • F23D2209/00Safety arrangements
    • F23D2209/20Flame lift-off / stability

Abstract

Burner for the combustion of powdered coal such as coal and brown coal that has a primary air duct (1) and a secondary air duct (2) that wraps the primary air duct (1) presenting the duct mouth area ( 1) of primary air, on the outside, an air diverter throat (3) and on the inside a stabilization ring (4) forming a single piece by putting the stabilization ring (4) radially inwards as an internal denture in the primary air duct (1), configuring the air diverter throat (3), the stabilization ring (4) and a part of the primary air duct (1) a unique piece characterized by the configuration of a piece formed by the throat (3) air diverter, the stabilization ring (4) and a part of the primary air duct (1) forms the area of the mouth of the primary air duct (1) ending the throat (3) air diverter and stabilizer ring (4) level with the mouth of the primary air duct (1) and the air diverter throat (3) being configured, on the outer side of the end of the outlet side of the primary air duct (1), as a section that is It is expanding conically radially outward.

Description

NOx low carbon powder coal burner
The invention is focused on a burner for combustion of powdered fuel such as coal or lignite, preferably with a concentric structure having a primary air duct and a secondary air duct that envelops the primary air duct presenting the mouth area of the primary air duct, on the outside an air rejection throat and on the inside a stabilization ring forming a component of a piece projecting the stabilization ring radially inward modeling an internal denture in the primary air duct and forming the air diverter throat, the stabilization ring and a part of the primary air duct a component of a piece.
In the burners that are used for the combustion of powdered coal, the reduction of NOx emissions has represented and represents a relevant problem to be solved. The separation of combustion air into several partial currents makes it possible to adjust the particular air currents in terms of the amount of air, the distribution of air and the degree of vorticity and is known as a strategy to reduce the nitrogen oxides during the combustion of coal. The structure of such a burner with a stepped air intake is described in EP-B-571704. In this type of air conduction the admission of stepped air contributes to a reduction of NOx emissions already during combustion.
The technology of burners for the combustion of coal dust today pursues the objective of producing a strong separation between the gases of the pyrolysis and the oxygen during the first reaction or ignition to then involve the combustion air stepwise in the oxidation subsequent solid compounds and thus achieve a more effective reduction of NOx emissions.
From EP 0260382 A1 a low NOx burner is known which has a nozzle for pulverized coal for blowing a stream of a mixture of pulverized coal with a primary air, a secondary air nozzle that is arranged outside and coaxially with the nozzle for pulverized carbon, a tertiary air nozzle that is arranged outside the secondary air nozzle and coaxially with the nozzle for pulverized carbon and means for generating a vortex stream to introduce by blowing the secondary air and tertiary air like a vortex stream. Between the secondary air nozzle and the tertiary air nozzle there is arranged a separator that has a thickness such that the mixing of the secondary air with the tertiary air is slowed down and that a vortex current is generated between the secondary air and the tertiary air.
In addition to the splitting of the combustion air into partial currents, by means of a precise temporal and spatial definition of the ignition conditions and the separation between the fuel-rich flame core and the oxygen-rich peripheral currents, a further reduction of the NOx emissions
Such a definition can be made with the interaction of the components of a cyclonic body in the primary air duct, a stabilization ring in the mouth of the primary air duct and an air diverting throat of the secondary air duct as described in EP-B-670454. In this patent document a burner of this class can be seen in which at the end of the burner duct which is wrapped by a secondary air duct by the internal part of the mouth of the burner duct a stabilization ring is arranged and an air diverting throat is arranged on the outside of the burner duct.
In this area, the burner duct and the stabilization ring must be joined on the one hand and on the other hand the burner duct and the air diverter throat. This is generally done by welding so that in this area on each side of the burner duct a welding bead or a welding surface is formed. For this it is necessary that the materials conform to each other accordingly. The choice of materials and the realization of the welding bead in this area result in a high construction cost. In addition, therefore, in the area of the mouth of the burner duct or of the primary air that is bathed by aggressive elements and very thermally charged by the presence of welded joints, it should be expected to have breakdowns or have to be repaired frequently as well as The shelf life is affected by these conditions.
In this regard, the objective of the invention is to achieve a solution that makes it possible to configure the mouth area of a burner of this kind in a simpler way and / or for a longer useful life.
For a burner of the type described at the beginning this objective is achieved according to the invention by making the air diverting throat, the stabilization ring and a part of the primary air duct constitute the mouth area of the primary air duct with the throat being designed. air diverter and stabilization ring to end level with the mouth of the primary air duct and the air diverter throat is designed as a section that is radially expanding conically outwardly on the outer face of the end of the outlet side of the primary air duct
This makes it possible for the mouth area to be a component of a piece that has the shape of an air diverting throat on the outer side and the shape and contour of the stabilization ring on the inner side. This component can be welded, for example, by a perimeter weld bead to the front surface
of a burner duct or a primary air duct so that only one welding bead is present in the mouth area. Since only one welding bead is necessary, the burner can be manufactured faster than a burner according to the state of the art in which two welding beams are necessary. Furthermore, it is thus possible to arrange the weld bead, relative to the air flow in the burner or in the primary or secondary air duct further upstream, that is, from the burner outlet opening to the rear so that the weld bead it is arranged upstream from the mouth end of a central air duct that is eventually disposed in the primary duct. The burner zone configured according to the invention thus has a design for a longer life, that is, less susceptible to repairs and breakdowns as well as constructively simpler.
To be able to position, upstream of the burner, the junction point between the primary air duct and the area of the mouth that has the air diverter throat and the stabilization ring of the component of a piece, far away in particularly less areas thermally charged, the component of a piece conveniently also presents a part that forms an extension of the primary air duct almost to be seen as a component of the primary air duct. The air diverting throat, the stabilization ring and at least a part of the primary air duct form for this reason a part and constitute the mouth area of the primary air duct ending the stabilization ring in the air duct mouth Primary and / or air diverter throat ends level with the mouth of the primary air duct.
In order to produce the component of a piece, centrifugal casting processes are particularly suitable so that the invention for its realization provides that the component of a piece is produced by a centrifugal casting process.
Since it is necessary to make a connection between the component of a piece and the burner duct or the primary air duct, the invention for its realization provides that the component of a piece is fixed to the primary air duct, preferably by welding.
In an advantageous development the invention is characterized by an air guide body which is arranged in an annular groove between the primary air duct and the secondary air duct which can be adjusted in the direction of flow or in the opposite direction between the retracted position in the annular groove and a position where it ends level with the mouth of the primary air duct.
In this regard it is also advantageous for the burner to have a central air duct disposed in the primary air duct, the pilot lighter being able to move between a burner ignition position and a burner operating position in the direction of flow and in the opposite direction. , what the invention also provides.
In the configuration of the invention it is further advantageous that the mouth of the central air duct is disposed upstream before the mouth of the primary air duct.
In order to achieve optimum air conduction, the invention also provides that a cyclone body is arranged at the end of the ignition flame side of the pilot lighter.
In this case, a particularly convenient configuration of the cyclone body according to the invention is characterized in that a tubular area is arranged around the longitudinal axis of the pilot burner in the cyclone body, showing the end of the tubular area on the side of the ignition flame which It is preferably made conical, in the burner ignition position, by the end of the outlet side (mouth) of the primary air duct.
Finally, the invention provides that a primary cyclone body is arranged in the annular groove between the central air duct and the primary air duct.
The invention is based on the burner technology known from the state of the art for the combustion of coal and brown coal.
The burner according to the invention which can be used both for coal combustion and for lignite combustion, preferably has a concentric structure with a primary air duct and a secondary air duct. The primary air duct that is surrounded by the cylindrical secondary air duct with it forms an annular channel of combustion air conduction (secondary annular air channel).
Additionally, an air diverting throat is disposed on the outer side of the end of the outlet side (mouth) of the primary air duct that narrows the cross section of the annular channel between the primary air duct and the secondary air duct at its ends of the exit side and preferably ends level with the mouth.
On the inner side of the end of the outlet side (mouth) of the primary air duct a stabilization ring is arranged which is configured by an inwardly oriented edge with respect to the longitudinal axis of the burner which preferably ends level with the mouth and which penetrates the flow of primary air and coal in
powder.
On the outer side of the end of the outlet side of the primary air duct there is a secondary air guide body which can be moved, in the direction of flow, from a retracted position in the annular channel and a position in which it ends level with the mouth of the primary air duct.
The burner according to the invention also has a central air duct that is surrounded by a cylindrical primary air duct and which forms an annular conduit for the conduction of powdered coal and primary air (primary air nozzle or nozzle of the air duct the powders). Thanks to the concentric arrangement of the central air duct, the primary air duct and the secondary air duct, a particular intake of the individual air becomes possible.
A pilot burner is disposed inside the central air duct along the longitudinal axis of the burner. In this pilot lighter a cyclonic body is fixed which is a crown of vanes that is covered in the radial direction, at its outer end by a tubular extension that expands conically in the direction of the flow and extends beyond the mouth of the pilot lighter The pilot lighter, the cyclone body of the pilot lighter and the conical tubular extension preferably form a one-piece component that can be moved in the direction of flow from a retracted position of the central air duct to a position in the mouth of the duct central air
The combination rate of the fuel and combustion air can be adjusted by a primary cyclone body that is disposed in the annular channel between the central air duct and the primary air duct and a secondary cyclone body that is disposed in the annular channel between the primary air duct and the secondary air duct.
The burner according to the invention makes it possible to go beyond the state of the art known in the technology of burners for coal dust a burner operation in which the reduction reactions of a household that is fed with little oxygen content ( less than the stoichiometric ratio) are passed to the area around the burner between the primary flame and the secondary air flow. With the aid of the burner according to the invention, an area of combustion flue circulation of low oxygen content is established in this area around the burner in which the NOx compounds that inevitably result during the primary reaction are reduced to molecular nitrogen. Thus, a more efficient reduction of NOx emissions with the burner according to the invention is made possible in comparison with prior art burners.
The burner according to the invention, in the exemplary embodiments, is represented as a coal burner and as a brown coal burner in the attached figures. The burner shown in Figures 1-3 represents examples of realization of a coal burner while the burner shown in Figure 4 represents an example of realization of a brown coal burner. The burner according to the invention for the combustion of powdered fuels such as coal or lignite will be detailed in the following. They show:
Figure 1: A longitudinal section of a coal burner according to the invention with the pilot lighter retracted in the central air duct and the axially displaced secondary air guide body disposed in the mouth of the nozzle primary air
Figure 2: A longitudinal section of a coal burner according to the invention, the pilot lighter being arranged in the position corresponding to Figure 1 and the secondary air guide body is retracted on the outer side of the primary air duct in the respective annular channel
Figure 3: A longitudinal section of a coal burner according to the invention, the pilot lighter being arranged in the mouth of the central air duct and the secondary air guide body axially movable presenting the position described in Figure 1 and
Figure 4: the longitudinal section of a lignite burner according to the invention, the pilot lighter being arranged in the mouth of the central air duct and the axially movable secondary air guide body adopting a position such as that described in the figure 3.
Due to the characteristics of the invention common to the coal burner and the brown coal burner, the description of Figures 1-4 is first made in a general way.
The burner according to the invention shown in Figures 1-4 has a pilot burner (7) that can be moved in the direction of flow, which is arranged along the axis of the burner inside the central air duct 6 . The cylindrical central air duct 6 is surrounded by a cylindrical primary air duct 1 forming an annular channel. This annular channel is in turn surrounded by a cylindrical secondary air duct 2 and thus divides the combustion air sector into at least one or two annular channels.
The annular channel of primary air that conducts the fuel and the air that is configured by the central air duct 6 and the primary air duct 1 is connected with a grinder, not shown, in which the coal is milled and
It is dried during milling by a hot gas. A primary cyclone body 10 is imposed on the external side of the central air duct 6 at a determined distance to the outlet end of this annular channel, which imposes a rotation on the flow of primary air and powdered coal. Thus the flow is homogenized and the powdered carbon is enriched preferably on the inner side of the primary air duct 1.
Furthermore, a stabilization ring 4 having an edge that is radially inwardly oriented is disposed on the inner side of the end of the outlet side of the primary air duct 1. This edge that penetrates the primary air and coal dust stream is responsible for offering resistance to the carbon particles before they leave the primary air duct 1 and thus slows down and is accelerated again by the gas flow in the direction towards the central part of the burner duct.
At a certain distance before the mouth of the powder nozzle or the mouth having a stabilization ring 4, the primary cyclone body 10 which can be adjusted from the outside which rotates the current is arranged in the central air duct 6 of powdered coal and primary air. This results in a homogenization of the flow that passes through it inside the primary duct or the primary air duct 1 while enriching the powdered carbon on the outer surface of the dust duct.
At the outlet of the nozzle of the primary duct or the primary air duct 1 is the stabilization ring 4. The ring 4 has the shape of an internal denture and penetrates the flow zone of the powdered coal so that the carbon particles before leaving the primary conduit or primary air conduit 1 collide with a resistance. By collision with ring 4, the carbon particles are very slowed.
This lowers the flow rate for a short period below the characteristic fuel restart rate. This process defines the ignition point of the combustible products of the emitted gases. As a reaction to the shock, the powdered coal bounces, due to the deviation in the primary gas stream it becomes accelerated and is expelled towards the home. The previous sequence is schematically represented by date 12 of the figures.
The outer side of the end of the outlet side of the primary air duct 1 has a section that extends conically radially outwardly which represents an air diverting throat 3 for the secondary air flow passing outside by assigning reference number 11 to the throat itself, the air diverter throat 3 extends as a whole on both sides of the throat 11. The secondary air that is passed through the secondary air duct 2 circulates along or through the air diverter throat 3 outward, it moves away from the fuel-rich flame core and is supplied to the fuel products sufficiently delayed. In this case, the air diverter throat 3 deals with the ignition process that is carried out without being affected by the secondary air and which is not distorted by air fluctuations or vortex formations.
By means of the stabilization ring 4 and the air diverter throat 3, in a manner described above, a controlled ignition of the powdered coal takes place in virtually all operating situations. In this case, by means of the stabilization ring 4 and the air diverter throat 3, an axisimetric, hot, recirculation zone of low oxygen combustion gases is configured downstream of the mouth of the primary air duct 1 between the flame Primary and secondary air flow.
To further bring the flow of powdered carbon particles towards the burner shaft from the annular channel formed by the central air duct 6 and the primary air duct 1 to increase the extent of the recirculation zone, the duct 6 of central air, considered in the direction of the flow, preferably has to be terminated well before the ring 4 for stabilizing the nozzle of the dust duct. However, in such a relation of the burner ducts according to the invention, it is not possible to operate the adjustable pilot burner 7 safely, first of all for a combined operation with fuel and coal, since the flow of the powder coal inwardly oriented , towards the axis of the burner, affects the flame of the pilot burner 7 and additionally prevents the observation of the call ignited by the darkening due to the coal dust.
In order to guarantee a safe burner operation for all operating states, however, the cyclonic body 8 fixed in the pilot lighter 7 is covered in its outer zone by a tubular extension 9. The tubular extension 9 surrounding the vane crown of the cyclone body 8, extends downstream in the form of a cone and serves as a diverter of the powdered carbon that deflects the stabilization ring 4 towards the center of the burner. Together with the pilot lighter 7 the spatial position of the conical tubular extension 9 can be adjusted in the direction of flow. This ensures a safe ignition as well as the observation of the flame of the pilot lighter in all operating situations.
The importance of the recirculation zone formed by the stabilization ring 4 and the air diverter throat 3 representing an oxygen-poor zone in relation to the NOx reduction is known from the state of the art. A large part of the reaction products produced by primary combustion reaches the oxygen-free recirculation zone where the decomposition of nitrogen oxides by reactive fuel components is made. Therefore, it is of interest to adjust the size of the recirculation zone to an optimum relative to low NOx emissions.
This is done by a secondary air guide body 5 that can be adjusted according to the direction of flow that
it is arranged on the outer side of the primary air duct 1 and which can be moved in the direction of flow between a position that is retracted in the secondary air annular channel and a position that ends level with the mouth of the primary duct 1.
Furthermore, the mouth of the primary air duct 1 or the burner nozzle is constituted by an air diverter throat 3 and a stabilization ring 4 that form a component and is connected to the dust duct.
or the primary duct 1 of the burner in a fixed and durable manner. For this, an integral production of the air diverter throat 3 and the stabilization ring 4 is preferred.
This one-piece component with the air diverter throat 3 and the stabilization ring 4 is produced primarily, but not exclusively, by a centrifugal casting process. Even so, the primary air duct 1 can be a part of the component of a piece that has the air diverter throat 3 and the stabilization ring 4.
The way of operation of the adjustable secondary air guide body 5 in combination with the air diverter throat 3 as regards the recirculation zone and taking into account the operating state will be explained based on the attached drawings.
Figure 1 shows a lignite burner in which the pilot burner 7 is retracted in the central air duct 6 and the adjustable secondary air guide body 5 is disposed in the mouth of the primary air duct 1. In this position of the secondary air guide body 5 it cannot be moved further downstream and ends up level with the air diverter throat 3 increasing the efficiency of the air diverter throat 3. The secondary air that passes through the annular channel, formed by the primary air duct 1 and the secondary air duct 2 is diverted outwardly and moves away in the radial direction of the flame core from the primary combustion zone. By displacing the secondary air guide body 5 to the position shown in Figure 1, a separation layer is generated that is adjustable in maximum size downstream from the mouth of the primary air duct 1 between the primary combustion and the air flow secondary. This recirculation zone with a maximum size extension represents an optimum in Figure 1 for the operating position in terms of NOx reduction.
Figure 2 shows a longitudinal section of a coal burner according to the invention in which the pilot burner 7 is disposed in the position shown in Figure 1 and the adjustable secondary air guide body 5 is disposed retracted in the channel annular secondary air on the outer side of the primary air duct 1. In this regard, the components are thus arranged for an operating state of the coal burner in which a smaller separation layer is required between the primary combustion and the secondary air flow and thereby a recirculation zone in the smaller radial direction. downstream of the mouth of the primary air duct 1. The pilot lighter 7 in this operating state is in turn retracted in the central air duct 6. The secondary air guide body 5 which affects its position adjustable to the size of the recirculation zone is retracted in accordance with the position of the pilot lighter 7 in the respective annular channel. In this position the secondary air guide body 5 divides the air flow of the secondary air duct 2 into two different sub-currents and homogenizes them. Thus the secondary air guide body 5 takes care that the ignition process at the burner outlet is not affected by air fluctuations or vortex formations of the secondary air and that the secondary air is supplied sufficiently delayed to the combustible products
Figure 3 shows a longitudinal section of a coal burner according to the invention, the pilot lighter 7 being arranged in the mouth of the central air duct 6 and the displaceable body 5 of the secondary air guide has the position shown in Figure 1 The burner components according to the invention are arranged as corresponding to an operating state in the ignition state or in a combined state of a coal burner. For this operating state, the conical tubular extension 9 appears outwardly through the mouth of the central air duct 6 and downstream through the stabilization ring 4 of the primary air duct 1 in the direction of flow to ensure ignition and Safe observation of the 7 pilot lighter. The secondary air guide body 5 is arranged, as in Figure 1, in the mouth of the primary air duct 1 and cannot be moved further downstream. Through this arrangement of the air guide body 5 the efficiency of the air diverter throat 3 is improved and a maximum size separation layer is formed downstream of the mouth of the primary air duct 1 in which the NO reaction compounds Primary can be broken and reduced to molecular nitrogen and an optimum is reached relative to the NOx reduction for the represented operating state.
Figure 4 shows an exemplary embodiment of a brown coal burner having the same characteristics according to the invention as the coal burner described above. The differences with a coal burner are in the relationships of the diameters of the burner ducts.
Figure 4 shows a longitudinal section of a lignite burner according to the invention, the pilot lighter 7 being arranged in the mouth of the central air duct 6 and the movable body 5 of the secondary air guide adopting a position as described according to figure 3. The burner components are arranged according to an operating state in the ignition state or in a combined state
of the brown coal burner. For this operating state of the burner according to the invention, the pilot lighter 7 adopts a position in the mouth of the central air duct 6 and cannot be moved further downstream. The conical tubular extension 9 looms out through the mouth of the central air duct 6 and the stabilization ring 4 to ensure a safe ignition of the pilot burner 7. The movable body 5 air guide
Secondary 5 presents the position described in Figures 1 and 3 from which it cannot be moved further downstream. By means of this positioning of the secondary air guide body 5 a maximum size recirculation zone is formed downstream of the mouth of the primary air duct 1 in which the reduction of NO compounds to molecular nitrogen according to the state can be made of operation relative to an optimal reduction of NOx.
By means of the burner 5 according to the invention for the combustion of powdered coal such as coal or lignite, a device is provided that makes possible a greater reduction of NOx emissions relative to the state of charge and the quality of the powdered coal in comparison with the state of the art
List of reference numbers
1: primary air duct
15 2: secondary air duct
3: air diverter throat
4: stabilization ring
5: secondary air guide body
6: central air duct
20 7: adjustable pilot lighter
8: cyclone body
9: conical tubular extension
10: primary cyclone body
11: throat

Claims (9)

1. Burner for the combustion of powdered coal such as coal and brown coal that has a primary air duct (1) and a secondary air duct (2) that envelops the primary air duct (1) presenting the mouth area of the primary air duct (1), on the outside, an air diverter throat (3) and on the inside a stabilization ring (4) forming a single piece by putting the stabilization ring (4) radially towards inside as an internal denture in the primary air duct (1), configuring the throat
(3) air diverter, the stabilization ring (4) and a part of the primary air duct (1) a unique piece characterized by the configuration of a piece formed by the throat (3) air diverter, the ring (4 ) of stabilization and a part of the primary air duct (1) forms the mouth area of the primary air duct (1) ending the throat (3) air diverter and the stabilization ring (4) level with the mouth of the primary air duct (1) and the air diverter throat (3) being configured, on the outer side of the end of the outlet side of the primary air duct (1), as a section that expands radially outwardly conically .
2.
 Burner according to claim 1 characterized in that the burner has a concentric structure.
3.
 Burner according to claims 1 or 2 characterized in that the component of a piece is a centrifugal casting component.
Four.
 Burner according to one of claims 1-3 characterized in that the component of a piece is fixed in the primary air duct (1) by welding.
5.
 Burner according to one of the preceding claims characterized by an air guide body (5) disposed in the annular groove between the primary air duct (1) and the secondary air duct (2) that can be displaced in the direction of the flow and in the opposite direction between the retracted position in the annular groove and a position that ends level with the mouth of the primary air duct (1).
6.
 Burner according to one of the preceding claims characterized in that the burner has a central air duct (6) disposed within the primary air duct (1) in which a pilot lighter (7) movable in the direction of flow and in the opposite direction between the burner ignition position and the burner operating position.
7.
 Burner according to claim 6 characterized in that the mouth of the central air duct (6) is arranged upstream before the mouth of the primary air duct (1).
8, Burner according to claims 6 or 7, characterized in that a cyclone body (8) is arranged at the end of the side of the ignition flame of the pilot lighter (7).
9.
 Burner according to claim 8 characterized in that in the cyclonic body (8) a tubular section is arranged around the longitudinal axis of the pilot burner and the end of the tubular section, preferably made conical, of the side of the ignition flame protrudes in the ignition position of the pilot burner (7) by the end of the outlet side (mouth) of the primary air duct (1).
10.
 Burner according to one of claims 6-9, characterized in that a primary cyclone body (10) is arranged in the annular groove between the central air duct (6) of the primary air duct (1).
ES06013706T 2005-07-07 2006-07-03 Coal burner powder low nox emissions. Active ES2373562T3 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE102005032109 2005-07-07
DE102005032109A DE102005032109B4 (en) 2005-07-07 2005-07-07 Carbon dust burner for low NOx emissions

Publications (1)

Publication Number Publication Date
ES2373562T3 true ES2373562T3 (en) 2012-02-06

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
ES06013706T Active ES2373562T3 (en) 2005-07-07 2006-07-03 Coal burner powder low nox emissions.

Country Status (7)

Country Link
EP (1) EP1741977B1 (en)
AT (1) AT525614T (en)
DE (1) DE102005032109B4 (en)
ES (1) ES2373562T3 (en)
PL (1) PL1741977T3 (en)
RS (1) RS52071B (en)
ZA (1) ZA200605567B (en)

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DE102005032109B4 (en) 2009-08-06
PL1741977T3 (en) 2012-02-29
ZA200605567B (en) 2007-09-26
EP1741977B1 (en) 2011-09-21
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AT525614T (en) 2011-10-15
DE102005032109A1 (en) 2007-01-18

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