WO2007110198A1

WO2007110198A1 - Burner system, in particular for ovens fired by biosolids

Info

Publication number: WO2007110198A1
Application number: PCT/EP2007/002575
Authority: WO
Inventors: Rolf Härdtner; Paul Christian; Günter LÖFFELHARDT; Rolf WÖRLE
Original assignee: Haerdtner Rolf; Paul Christian; Loeffelhardt Guenter; Woerle Rolf
Priority date: 2006-03-23
Filing date: 2007-03-23
Publication date: 2007-10-04
Also published as: DE102006013863B4; DE502007004134D1; DE102006013863A1; DK2002178T3; EP2002178A1; EP2002178B1; ATE471489T1

Abstract

For a burner system, in particular for a burner system of ovens fired by biosolids, the burner trough is provided in a transition chamber between the fan arrangement and the gas-mixing chamber, air streams which are fed over different air-channelling paths flowing through the burner trough with vortexing action.

Description

Burner system, in particular for biomass fueled

oven

The invention relates to a burner system, in particular for oven-fired oven, according to the preamble of claim 1.

A burner system of the aforementioned type is known from WO 90/14558. In this, the burner trough delimits the fan chamber against the gas mixing chamber located in the transition to the fuel gas outlet, and only an annular gap-like connection is provided between the fan chamber and the gas mixing chamber, which is bounded radially inwardly by the outer circumference of the burner trough and radially outwardly by the inner circumference of the housing , The air supplied to the gas mixing chamber via the blower device thus flows over the burner trough on the circumference, so that no throughflow of the burner trough emanating from the blower space is provided in the direction of the gas mixing chamber. Rather, the combustion material located in the burner trough is acted upon only by the proportion of air, which flows at the outgoing from the fan, cyclone-like and directed against the fuel gas flow through the gas mixing chamber as a result of the central vacuum in the direction of the burner trough and in the burner trough back to the Fuel gas outlet is deflected. Accordingly, only a partial combustion takes place in the burner trough open only to the gas mixing chamber and in the gas mixing chamber itself, and the further burnout in the region of the fuel gas outlet and thereafter, whereby the combustion conditions are difficult to influence, since they also depend on the respective power of the blower device change.

Furthermore, EP 1 122 495 A1 discloses a burner system fired by biosolids with a burner unit in which a gas mixing chamber belonging to the burner unit is located between a blower device of the burner unit and an oven-side firing space, which is radially constricted onto the firing space in a coaxial arrangement with the blower device and forms a swirl nozzle. Against the blower chamber of the blower device of the gas mixing chamber is delimited by acting as a thermal barrier screen wall with this associated supply air distribution head. Fresh air or purified fuel gas is used as supply air as Rezigas.

The blower device works, as well as in WO 90/14558, with a trained as a link head Forderglied. The fan room is in the peripheral region of the Fordergliedes with the gas mixing chamber in open Stromungsverbindung, so that via a supply air distribution head and / or on the Forderglied axially expiring further supply air supply supply air supplied from the Forderglied with twist as to the axis of rotation of the Fordergliedes spiral or helical air vortex in the gas mixing chamber is required and flows in the mixing chamber on the acting as a twist damper Ubertrittsquerschnitt the furnace space. In the furnace-side firing chamber, this results, after passing through the swirl nozzle, a spiral-shaped gas cylinder, which subsequently widens outward to the crossover cross section and thereby becomes a cyclonic air vortex. As a result of the strong rotation, a negative pressure zone is formed centrally, as a result of which a central return current vortex results for the gas cylinder ending above the bed of the firing space. This recoil current vortex strikes the screen wall, expands and is deflected along the screen wall in the direction of the near-wall, the Gasmxschraum by flowing air swirls and thus re-integrated into this.

Since the in the suction against the screen wall rotating back flowing fuel gas was heated in the furnace, resulting from the admixture to the blower device in the vortex supply air requested a heating the same, and in conjunction with a reinforcement of the air rotation, wherein the CO content in the on the screen In the wake flowing back fuel gas vortex reacts with the oxygen of the supply air and results in a given combustion process with internal NO _x reduction due to the given temperatures.

The construction of the blower space, gas mixing space and furnace combustion chamber with overflow of the bed of the combustion chamber, which is substantially one after the other, basically allows long residence times for the combustion gases, especially in connection with the cyclonic air movement, before they pass from the combustion chamber into the fuel gas outlet adjoining them, but requires corresponding Structural provisions relating to the transition from the combustion chamber to the fuel gas outlet as well as, on the basis of

Sequential arrangement of the blower device to the firebox, a corresponding space requirement.

Furthermore, EP 0 945 676 A2 discloses a burner for solid fuels, such as wood pellets, which has a combustion chamber which is airtight except for the fuel gas outlet is arranged, which is by a downstream suction in all operating states under negative pressure.

The burner is designed as a burner pot, which has to supply with primary and secondary air at different levels lying radial or radial and bottom air supply. The circumferentially provided for the burner pot axially spaced Luftzufuhrungen form Sekundarluftzufuhrungen and are connected to a resulting by doubling the Topfwandung annulus, which in turn is connected to a secondary air supply line.

From DE 43 44 760 Al a furnace for solid fuels, in particular wood chips is known, from the combustion chamber via an exhaust fan, the flue gases are sucked off and in the combustion chamber, a combustion bowl is arranged immersed in an air supply space. The combustion bowl has ground and circumferential intake openings for primary air. Furthermore, secondary air is supplied above the edge of the combustion dish, the primary and the secondary air intake running partly through common air channels.

The invention has for its object to further improve such a burner system in terms of efficiency and the reduction of polluting pollutants.

According to the invention, this is achieved with the features of claim 1, according to which the Brennungsraum delimiting burner trough dipping into the transition space and a storage space is delimiting, so that let the burner system represent a very compact unit, with respect to the place of use as well the feed of the fuel and access to the burner trough is advantageously designed. In addition, the offers in the Transitional space dipping and to a storage space delimiting arrangement of the burner trough particularly favorable opportunities for Luftzufuhrungen on the burner trough and the firebox from the point of view of the local air distribution as well as the air movement, tapering on the hearth with burner trough as helical gas roller, and in the firebox and expiring from the firebox as Cyclonic air vortex, which leads to a return of a portion of the already exited from the combustion chamber, CO-containing fuel gases in the firing chamber and thus to an internal NO _x reduction due to the centrally generated negative pressure. This is achieved in a very compact design, which is also simple and variable with respect to the basic elements used, so that with the same basic structure also favorable opportunities for variations and variations, even under performance considerations, which in view of a widespread use also already existing wood oven offer advantages.

In particular, the burner system according to the invention is to be fired with biosolids in the form of pellets, namely wood pellets, which can be fed in at a favorable rate, in particular between 6 and 10 mm in diameter, and which have no or only a very small proportion of bark, so that During incineration a small amount of ash results and the resulting dust particles are largely discharged with the fuel gas. A in the furnace zugefuhrten fuel gas existing dusty ash content is - when burning in the corresponding purity of existing bio solids, including bark-free wood in pellet form - for wood oven because of the mineral content of the ash but quite desirable.

With regard to the influence of the air currents and the air distribution, it proves appropriate, the Air supplies from the storage space to the burner trough auszufuhren as partial air feeds, so that in a simple manner specifically related influence possibilities arise.

As partial air feeds, in particular, those are provided which connect the storage space of the transitional space as first partial air feeds to the burner trough in the region of their bottom and as second partial air feeds to the storage space of the transitional space with the burner trough in the wall region adjoining the bottom zone and as third partial air feeds from the transitional space to the burner trough leak in the peripheral region remote from the bottom, these partial air supply can be designed variably with respect to the respective supplied amount of air, so that - also depending on pressure - both with respect to the respective amount of air, the respective Stromungsintensitat as well as the respective direction of flow yield influencing possibilities. These are also with regard to the optimization of the respective system and the experimental work to optimize such a system advantage.

In particular, the first and the second partial air feeds preferably comprise openings in the wall of the burner trough, which are designed as bores or slots, wherein the arrangement as well as the embodiment preferably takes place in each case to the effect that corresponding Luftfuhrungs- effects. This example, characterized in that the openings are designed as against the storage space against the Anstromrichtung widening trapping and / or that the openings are designed against the interior of the burner trough as extending in the direction of the desired Luftausstrome Luftfuhrungen. Such Luftfuhrungen can for example also by against the interior of the burner trough extending forms, be formed by scheduled Leitkorper or guide plates. The interior of the burner trough associated Luftfuhrungen in the form of characteristics, or Fuhrungsplatten or the like can be used in the invention with advantage also to prevent immediate occupancy of the respective openings in the burner trough with fuel or even deposited with fuel particles or ash.

In principle, the third partial air feeds can also be designed in the manner described. However, it is particularly simple and advantageous to design these third partial air feeds on the output side to form the cup-shaped burner trough in the manner of an annular gap, in particular by forming an annular gap.

Preferably, the partial air feeds are at least partially associated with each other delimited space parts of the transition space, which have separate connections to the fan room, which can be extended options for the desired air volume distribution to the individual partial air supplies in terms of the desired speed as well as the respective desired air pressure can be achieved.

For this purpose, a preferred embodiment provides that the first and the second partial air feeds start from an inner space part of the transition space as storage space, which has an independent connection to the blower space. Preferably, the fan space is delimited against the transition space via a screen wall which extends transversely to the axis of rotation of the Fordergliedes the blower device and the radially inwardly limited an annular gap as a connection between the blasting room and the storage space of the transition space. The outer boundary of this designed as an annular gap connection is preferably formed by an annular wall, the Transitional space divided into firebox and fan room divided into an inner and an outer part of the room, these space parts extend annularly surrounding the axis of rotation of the Fordergliedes and wherein the outer space part is designed as an annular Luftfuhrungskanal, which is in communication with the third partial air feeds, preferably summarized by an annular gap in height of the edge of the burner trough can be formed.

The storage space as part of the inner space part is preferably closed axially via a transverse connection between the burner trough and the inner space part against the outer space part delimiting annular wall, wherein the cross-connection is formed, for example, as a support flange via which the napfformige burner trough is truncated on the annular wall. The inner space formed as an annular space part is thus open only to the blasting room, so that it proves - even in consideration of the pressure built up on the Forderglied - as storage space for the amount of air on the part of the Fordergliedes the blower device as a ring roller rotating over the gap connection between screen wall and annular wall is supplied. According to the impressed, resulting from the direction of rotation of the vortex Stromstrom openings in the wall of the burner trough results in the burner trough a rotating air movement. In particular, the first, bottom-side partial air feeds also have an air admission of the fuel material located in the burner trough from below, so that a uniform burn-out results, when viewed in total about the axis of rotation of the Fordergliedes spirally rising fuel gas cylinder.

The radially preferred by the running through to the bottom of the blasting room annular wall between the inner and outer space part the demarcated space delimited Geblaseraum has, passing through the annular wall, a connection to the outer space part, which is preferably formed by a plurality of circumferentially provided for the blower space recesses in the annular wall, so that by the vote of the respective cross sections of the compounds to the room parts and the distribution of air can be achieved on the space parts, which moves through the radial transfer to the outer annulus in the outer annulus, the air as a helical ring roller upwards, that is, in the direction of the third Partilluftzufuhrungen and the roller-shaped movement of the third partial air feeds incoming air at Inflowing to the firebox enhances the spiraling motion of the air vortex already built up in the cup-shaped burner trough.

The, in the embodiment of the invention, the third partial air feeds preferably forming annular gap connection to the outer part of the room is created in particular by overlapping the combustion space of the gas mixing chamber of a gas mixing head is provided, the Ubertrittsquerschnitt from the firing chamber on the gas mixing chamber preferably in or adjacent to the parting plane of the housing Burner system is located, the upper part is formed by the gas mixing head and the lower part of the blower chamber with the overlying napfformigen burner trough within the transition space, which is limited to the outside - as Gehausewand - by the outer wall of the outer space part of the transition space.

The connection between housing upper part and housing lower part, which are preferably designed in sheet metal construction, is expediently carried out by flanging, wherein the flanges can be used simultaneously within the scope of the invention to radially inwardly over the outer space part To form air baffles through which the rising in the outer part of the room air roller can be at least partially diverted to the third partial air feeds forming annular gap.

Preferably, in the context of the invention, a radial constriction in the transition between the napfformigen burner trough and the gas mixing chamber is given, this radial constriction can be created both by the design of napfformigen burner trough, as well as in that the inlet cross-section to the gas mixing chamber on the part of the gas mixing chamber based on the Diameter of the napfformigen burner trough is made smaller. Also by this measure can be an intensification of the cylindrical air movement ascending from the napfformigen burner trough reach into the gas mixing chamber, so that there are cyclonic effects that can lead to a return flow of already passed into the gas mixing chamber fuel gases centrally in the napfformige burner trough.

In the area of the bottom of the burner trough the recirculating gases are redirected while maintaining the rotational movement radially outward, which can be achieved over a wide power range of the burner system the desired, intensified by the turbulence and low-emission combustion.

In a further embodiment of the invention, it proves to be expedient if a further Zuluftzufuhrung, in particular a Frischluftzufuhrung is provided auslaufend on the fuel gas outlet, which follows via fourth partial air feeds to the flame tube, starting from the fan room. For this purpose, the outer space part of the transitional space, via which the third partial air feeds are fed, is preferably used as the connection to the blower space, with the fourth, into the flame tube einmundenden partial air inflows as openings in the form of individual holes or as an annular gap can be formed in the simplest way, characterized in that the flame tube has two successive and mutually offset in diameter sections that leave a corresponding air inlet gap as an annular gap. Thus, an intensive mixing of fuel gases and supply air can be achieved within the flame tube again, which has an advantageous effect on the reduction of the pollutant content of the fuel gases, so that the combustion gases exiting through the flame tube are extremely low in pollutants, at least virtually pollutant free. Preferably, the flame tube is connected transversely to the axis of rotation extending to the gas mixing chamber, so extends transversely to the built-up on the blower vortex.

The upper part of the housing which surrounds the gas mixing head is preferably at least partly double-skinned, so that at least in partial areas, a channel-like guide follows for the part of the supply air, which is supplied to the fourth partial air feeds, at least in subregions to the outer space part of the transition space If appropriate, the corresponding crossover sections can also be designed to be adjustable, so that the air distribution to the individual partial air feeds can also be changed as desired on existing systems.

The blower device, which is used in conjunction with the inventive burner system, preferably comprises a Forderglied with circumferentially expiring in the extension of the Forderelemente the Fordergliedes vortex bodies provided as Forderelement preferably a Geblaserad is provided in radial extension to the blades of the Wirbelkorper are recognized , The blades of the fan wheel are preferably curved in the direction of rotation flat, so designed flat convexly curved with respect to the direction of rotation and as a Wirbelkorper are expediently in the radial extension of the blades to the blade plane optionally employed angled, continuations exist, which may be formed closed or articulated, so For example, as self-contained chain links or horseshoe-shaped or forked with freely expiring arms. Depending on whether a higher pressure or a larger volume is required for the output-dependent required air flow, the blades are expediently chosen in their curvature - stronger curvature / higher pressure, flatter curvature / higher volume -, in addition to the distribution of the generated rotating air flow On the space parts of the transition space or the associated with this partial air feeds on the Wirbelkorper is affected, the corresponding Abdrangeffekte in the direction of the respective connection to the respective space part of the transition space result.

In the context of the invention is preferably the blower device associated drive, in particular designed as an electric motor, coaxial with the axis of rotation of the Fordergliedes, and it is further determined the drive motor against the bottom of the blower chamber, wherein in the bottom of the blower chamber preferably enclosing the hub of the Fordergliedes the air intake takes place, which may include as a supply air and a ruckgefuhrten fuel gas, in particular cooled accordingly.

For the burner system according to the invention, in particular, an arrangement with an upright extent of the burner part, in particular with a vertical extent in FIG Direction of the axis of the Fordergliedes as appropriate, which allows in a favorable manner, the supply of the particular formed by wood particles in the form of pellets fuel from the top of the burner trough in. Here, over the circumference of the burner trough several, in particular two approximately diametrically opposed feeds are provided to achieve gleichmaßige distribution of the fuel in the burner trough.

Furthermore, it is advantageous to arrange an access opening to the firing space in the region of the gas mixing head, ie from above, the access opening being expediently provided centrally opposite the burner trough, so that the extraction of residue, in particular ash residue, from the burner trough is also possible.

For a burner system according to the invention, a distribution of the air quantity required via the blower device proves to be expedient, in which approximately 30% of the supplied fresh air or supply air accounts for the first and the second partial air feeds, preferably at approximately the same distribution to these partial air feeds. For the third partial air supply proves a share between about 30 and 50% of the fresh air or supply air as appropriate, with a mean value of about 40% is a preferred value. Deviations from this, in particular depending on the quality and / or the consistency of the fuel and the humidity are within the scope of the invention. Based on the fourth partial air feeds proves a proportion of about 20 to 30% in terms of influencing the pollutant emissions as appropriate, this proportion can be particularly increased when the fourth partial air feeds in particular a cooling of the fuel gases is sought. Related to a burner system with a arranged as an upright enclosure enclosed unit burner part with a fuel gas outlet, with an open against the fuel gas outlet burner trough a Feuerungsraumes and with a burner trough lying between this and the fuel gas outlet gas mixing chamber, and with a lying below the burner part blower with against the burner trough demarcated blower space and a Forderglied with upright axis of rotation, on the basis of the blower chamber, the air supply to the burner part in a rotating air vortex, it is further appropriate for its compact and lightweight, well insulated construction, when enclosing the burner part and overlapping the gas mixing chamber, So over the circumference and head of the housing this is formed with a double-shell, which is provided as Luftfuhrungskanal with on the burner part ausmundenden terminals. In particular, the Luftfuhrungskanal formed by the double-shell casing can be assigned to the third and fourth partial air guide, preferably with radial connection to the fan cavity.

Particularly useful is such a configuration, apart from the thermal insulation, also for the noise insulation, both posted for the blower chamber as well as the burner part, which has the storage space in the transition between the blower chamber and burner trough, the radially inner and axially upper limit by the dipping formed in the transition space burner trough is formed.

Further details and features of the invention will become apparent from the claims. Furthermore, the invention will be explained below with reference to an exemplary embodiment. Show it: 1 is a schematic sectional view of a burner system according to the invention,

FIG. 2, in turn, schematically, a sectional view of the blower device of the blower device provided as a conveyor element, FIG.

Fig. 3 is a plan view of the blower wheel according to FIG. 2, and

Fig. 4 is an isolated sectional view of one in the blower wheel circumferentially provided in the extension of a Geblaseradschaufel Wirbelkorpers in section, as a Wirbelkorper here, for example, a chain link is provided.

The burner system according to the invention comprises, as shown in FIG. 1, a burner which is designed in particular as a structural unit 1 and which is stationary or movable and which, in particular, serves a purpose according to the invention for heating ovens as consumers, whereby as biomass solid biomass, mainly used in the form of wood pellets.

The illustrated as a unit 1 burner comprises in the embodiment shown, a top part 2 and a lower part 3, the housing parts 4 and 5 in a flange 6, as indicated by the screw 7, are braced against each other. Based on the structure of the assembly 1, the lower part 3 comprises a blower device 8, which is assigned as a drive designed in particular as an electric motor motor 9, with which the Forderglied 10 is drivingly connected via a shaft connection 11. The Forderglied 10 includes as Forderelement 12 a Geblaserad 13 with blades 14 which extend substantially radially and together with an upper cover plate 15 and a lower channel wall 16 define substantially radially extending channels, which radiate radially inward, substantially in the foot region of the blades 14, from a central suction 17. The suction chamber 17 is closed at the top over the cover plate 15, via which the blower wheel 13 is also flanged with the shaft connection 11. To the suction chamber 17 corresponds to a central cutout 18, which is bounded by the lower channel wall 16 and the axial, that is in the direction of the axis of rotation 19 of the blower 8, in overlap to an open to the environment Ansaugoffnung 20. The Ansaugoffnung 20 is, preferably the central shaft connection 11 enclosing, provided in the bottom of the outer wall 21 of the housing base 5, to which the motor 9 is arranged axially offset. This results between the shaft-side end plate of the motor 9 and the outer wall 21, an annular gap and it can be used at the same time for cooling the motor 9, the air sucked through the blower 8.

Radially outward to the blower wheel 13, preferably projecting radially outward in extension of the blades 14, Wirbelkorper 22 is provided, which are shown in the exemplary embodiment as chain links 23 whose member plane is directed radially to the axis of rotation 19, wherein preferably the respective chain links 23 in extension of the blades 14 are arranged and held by connection to the cover plate 15 and / or the channel wall 16.

The thus configured Forderglied 10 lies in a blasting room 24 which is bounded below by the bottom of the outer wall 21 of the housing base 5 and the circumferential direction of an annular wall 25 which is enclosed by an inner wall 25 of the housing base 5. The upper boundary of the blower chamber 24 is formed by a screen wall 26, the to the housing base 5 is determined, for example, by bolts 27 forming support bolts, and which ends circumferentially with radial spacing from the inner wall 25, so that an annular gap 28 as discharge opening 60 results between the screen wall 26 and the inner wall 25.

Surrounded by the inner wall 25 and spaced from this and also to the screen wall 26 is centrally and coaxially to the inner wall 25 in the exemplary embodiment, a combustion chamber 32, which is bounded against the blasting room by a cup- or pot-shaped burner trough 33, which has a peripheral wall 34 and has a bottom 35. Supported and fixed in position to the housing bottom part 5, the burner trough 33 is connected via a flange connection 36 to the peripheral wall 34 of the burner trough 33 and to the inner wall 25, fixed in position flange parts.

The annular gap 28 is open axially to the inner space part 29 of a transition space 30, which enclosing the inner wall 25 has an outer space part 31, which is bounded on the outside by the peripheral part of the housing outer wall 21.

Through the burner trough 33 is within the inner space part

28 delimited against the blasting room 24 to a storage space 61, on which the formed by the annular gap 28 Abstromoffnung 60 from the blasting room 24 to the inner space part 29 and from which the burner trough 33 circumference and bottom side over in its peripheral wall 34 and in its bottom 35th provided openings 57 and 58 is supplied.

The outer space part 31 of the transition space 30, the fan chamber 24 has peripheral openings 37, which are as provided in the inner wall 25 recesses, so that the fan room 24 to outer space part 31 and inner space part

29 separate compounds in the form of the annular gap 28 and the openings 37 exist. The outer space part 31 extends as an annular channel up to the height of the flange 6, in which the housing parts 4 and 5 adjoin one another, wherein the housing upper part 4 receives a gas mixing head 38 with a gas mixing chamber 39, which is in axial overlap to the burner trough 33, wherein in the flange plane 6 between the gas mixing head 38 and the burner trough 33 by corresponding axial spacing a radially extending annular gap 40 remains over which the outer space part 31 is transverse to the extension direction of the rotation axis 19 with the burner trough 33 in combination.

In extension of the outer space part 31, that is, the annular channel formed by the inner wall 25 and the peripheral part of the outer wall 21 of the gas mixing head 38 is provided with a channel connection 41 to the fuel gas outlet 42, wherein the channel connection 41 inwardly through a gas mixing chamber 39 with the interposition of insulation 43 enclosing inner wall 44 and the radially spaced therefrom outer wall 45 of the housing upper part 4 is limited, so that results for the gas mixing head 38, and thus the housing upper part 4, in analogy to the peripheral part of the housing base 5, a Doppelschaligkeit that is used for the Luftfuhrung , For branching off to the side Brenngasauslass 42 toward the channel compound 41, as part of the outer wall 45, projecting radially outward, a nozzle 46 in which, starting from the gas mixing chamber 39, then on the lining of a flame tube 47 extends over which the fuel gases Consumers, ie here to be heated zones of the oven, is supplied.

Between the nozzle 46 and the flame tube 47 remains an annular gap which is open to the outer space part 31 and to the lying in the extension channel connection 41, and over the supply air is supplied, which is mixed with the exiting fuel gases, in particular in the region of the flame tube 47. For this purpose, the flame tube 47, which is not shown, be provided with corresponding inlet cross sections or, for example, also be configured in such a way that at least over part of the circumference an annular gap results, which allows an inflow of the supply air into the flame tube 47. However, it is also within the scope of the invention to carry out the mixing of supply air and fuel gases exiting via the flame tube 47 only in the region of the outlet cross section, which is preferably in the transition region to the oven, not shown, to which a connection piece 48 can be assigned, which is assigned to the connection piece 46 is to be fixed via a flange connection, preferably via a quick release flange connection.

With regard to the design of the Ubertrittsquerschnittes between the outer space part 31 and the channel connection 41, it may be appropriate, as indicated at 49, the flange connection between the housing upper part 4 and housing bottom part 5 of the unit 1 to design like an iris, which is also due to inserted between the flanges aperture in easy way to achieve. Preferably, via the flange 36 between the burner trough 33 and the inner wall 25 of the inner space portion 29 in the upper region of the burner trough 33 is cross-sectionally closed, so that there is no short-circuit connection between the outer space part 31 and the inner space part 29 in the region of the annular gap 40. The flange connection 36 may be offset so far from the upper edge of the burner trough 33 that in addition to the annular gap 40 above the flange 36, the peripheral wall 34 of the burner trough 33 passing through inflow openings can be provided on the burner trough 33. The transition cross section from the burner trough 33 to the gas mixing chamber 39 is preferably constricted in the context of the invention, wherein this constriction can be realized by a retracted, not shown edge region of the burner trough 33, or by a over the burner trough 33 radially inwardly projecting part 50th the boundary of the gas mixing chamber 39.

Ausmundend on the gas mixing chamber 39 is the upper part 2 assigned a closable Serviceoffnung 51, which is closed in the exemplary embodiment by a stopper-like closure member 52 which is set in the simplest manner, for example by screwing and is to be inserted into a hulsenartige leadership 53 of the upper part 2.

Preferably, along the upper part 2, a fuel feed 54 in the form of at least one downpipe 55 is provided following a dosing device, not shown, which emits laterally obliquely from above onto the upper region of the burner trough 33 and the mouth side for flame shielding and / or distribution of the particular in shape associated with pellets fuel supply corresponding shielding parts 56 are assigned.

On the burner trough 33, the air is supplied via partial air feeds, of which the first partial air feeds through the bottom 35 of the burner trough 33 associated openings 57 are formed. Analogously, partial air feeds formed by openings 58 are provided in the peripheral wall 34 of the burner trough 33, wherein the bottom-side openings 57 form first partial air feeds and the peripheral openings second partial air feeds and are respectively fed from the inner room part 29 demarcated as storage space 61. The representation of the openings 57, 58 as bores is symbolic, and slots, inwardly and / or outwardly directed forms or the like may be provided instead of such bores, which, based on the respective energization, form air guides, via which the air movement within the burner trough 33 is to be influenced, for example as helical or vortex-shaped, is to make upward against the gas mixing chamber 39 extending air flow.

Reference to the bottom side, illustrated by the opening 57 first partial air feeds guide plates 59 are illustrated in the exemplary embodiment, on the one hand are suitable to influence the flow direction of the air entering through the openings 57, and also to achieve a shielding of the openings 57 against bottom-mounted fuel is so that obstruction of the openings 57 are avoided.

In addition to the outgoing from the storage space 61 of the inner volume part 29 first and second partial air feedings with the openings 57 and 58, third partial air feeds are provided, starting from the outer room part 31, these third partial air feeds for example and preferably through the annular gap 40, but optionally also through the The upper edge region of the burner trough 33 associated openings are formed and wherein the vortex movement of the air in the sense of a spiraling upward rising air flow can be increased via these third partial air supply according to the current flow through the outer space part 31 in the burner trough 33. As a result, results against the gas mixing chamber 39, a cyclonic air vortex, which leads to a very intense burning with minimized pollutant emissions, including among other things contributes that the cyclonic air vortex in the center leads to a negative pressure, through the part of the fuel gases from the gas mixing chamber 39 into the burner trough 33 is returned and there, with amplification of the rotating air movement, is deflected outwards again and flows into the cyclonic air vortex, which is derived from the gas mixing chamber 39 partially via the flame tube 47 to the fuel gas outlet 42, and it may also be useful in the invention to make the Ausstromweg from the gas mixing chamber 39 to the flame tube 47 so that the flame tube 47 to the gas mixing chamber 39 is approximately tangent, and not, as shown in the exemplary embodiment, radially. This in each case with the aim of as evenly as possible to detect the surfaces to be heated of the downstream oven and thus to achieve gleichmaßige heating of the baking surfaces, for this purpose, the whirling achieved flat Auffacherung the onflowing fuel gases significantly contributes.

In the context of the invention, the outer space part 31 also forms a connection of fourth partial air feeds to the blower space 24, wherein the fourth partial air feeds preferably extend to the flame tube 47, which is not shown.

In conjunction with the over the Forderglied 10 of the blower device 8 forced rotating air movement, which is disturbed by the downstream of the Forderglied 10 Wirbelkorper 22, as shown in Fig. 4, and split into partial flows, resulting, in particular in conjunction with the relative to the Direction of rotation of the formed as a blower wheel 13 Forderelementes 12 flat convex curvature of the blades 14 of the blower wheel 13 and a pressure build-up, so that pressure and Stromungsabhangig a targeted different air supply of partial air feeds is possible. In the context of the invention, it proves to be expedient, starting from the storage space 61 via the first and second partial air feeds, in each case approximately the same air proportions of the burner trough 33 to introduce, wherein the supplied via the first and second partial air intakes air proportion is preferably a total of about 30%. About the third partial air supply, in particular so the annular gap 40, preferably about 30 to 50% of the required amount of air supplied, wherein the average value of about 40% forms a preferred value. For the fourth partial air guide, a percentage between about 20 and 30% is appropriate.

The described burner system works, also due to the long residence time of the fuel gases, very low pollutant, and is characterized, with good metering of the fuel supply, by a simple adjustability of the heating power and a low-residue combustion.

Claims

claims

1. Burner system, especially for biomass fired oven, as an upright assembly

o a fuel gas outlet (42), o an open towards the fuel gas outlet (42) burner trough

(33) a combustion chamber (32), o a above the burner trough (33) between this and the fuel gas outlet (42) lying gas mixing chamber (39), and o below the burner trough (33) lying blower device (8), in a Geblaseraum (24) receives a Forderglied (10) with an upright axis of rotation and their Ansaugoffnung (20) and the burner trough (33) delimited Geblaseraum (24) open to the burner trough (33) out in the peripheral region of the Fordergliedes (10) lying Abstromoffnung (60) for a from the Forderglied (10) constructed, rotating air vortex, characterized in that the Abstromoffnung (60) on a storage space (61) mouths, the inner and upper boundary by immersing in a above the Geblaseraumes (24) lying Transitional space (30) arranged burner trough (33) is formed, which to the storage space (61) open Luftdurchtrittsoffnungen (57, 58).

2. Burner system according to claim 1, characterized in that the air supply from the storage space (61) into the burner trough (33) via partial air feeds.

3. Burner system according to claim 2, characterized in that first partial air feeds connect the storage space (61) with the burner trough (33) in the region of the bottom (35) of the burner trough (33).

4. Burner system according to claim 2 to 3, characterized in that second partial air supply lines connect the storage space (61) with the burner trough (33) in their adjacent to the bottom zone region of the peripheral wall (34).

5. Burner system according to claim 3 or 4, characterized in that the partial air feeds as openings (57, 58) in the wall (bottom 35, peripheral wall portion 34) of the burner trough (33) are formed.

6. Burner system according to claim 5, characterized in that the partial air feeds are formed as slots in the wall (bottom 35, peripheral wall region 34) of the burner trough (33).

7. burner system according to claim 6, characterized in that the slots in the wall (bottom 35, peripheral wall portion 34) of the burner trough (33) have an extension which the Direction of rotation of the over the Forderglied (10) constructed and the storage space (61) flowing through the air vortex corresponds.

8. Burner system according to one of claims 2 to 7, characterized in that third partial air feeds the transition space (30) with the

Burner trough (33) in the floor (35) remote

Connect border area.

9.Brennersystem according to one of claims 2 to 8, characterized in that the partial air supply at least partially mutually delimited space parts (29; 31) of the transition space (30) are assigned, the separate connections (annular gap 28;

Openings 37) to the blower chamber (24).

10. Burner system according to claim 9, characterized in that the first and the second partial air feeds from a storage space 61 forming inner space part (29) of the transition space (30) go out, to which an outer space part (31) of the transition space (30) provided enclosing from which the third partial air supplies go out.

11. Burner system according to claim 10, characterized in that the inner space part (29) and the outer space part (31) of the transition space (30) via a surrounding to Feuerungsraum

(32) and to the fan chamber (24) provided annular inner wall

(25) are separated.

12. Burner system according to claim 10 or 11, characterized in that the inner space part (29) of the transitional space (30) forming the storage space (61) is connected to the blower space (24) via the outflow opening (60), which is provided in the circumferential area to the screen wall (26) like an annular gap.

13. Burner system according to claim 12, characterized in that the Abstromoffnung (60) by an intermediate screen wall (26) and annular wall (25) given annular gap (28) is formed.

14. Burner system according to one of claims 10 to 13, characterized in that the outer space part (31) of the transition space (30) to the blasting room (24) is connected via a connection formed by peripheral openings (37) of the blasting room (24) is.

15. Burner system according to claim 14, characterized in that the peripheral openings (37) of the blower chamber (24) are formed by recesses in the annular wall (25).

16. Burner system according to one of claims 9 to 15, characterized in that the space formed by the inner space part (29) of the transition space (30) storage space (61) expiring axially limited to the connection of the outer space part (31) to the burner trough (33) is.

17. Burner system according to one of the preceding claims, characterized in that the transition space (30) is covered axially by a gas mixing head (38).

18. Burner system according to claim 17, characterized in that the gas mixing head (38) has a covering the combustion chamber (32) lying gas mixing chamber (39).

19. Burner system according to claim 18, characterized in that the firing space (32) facing inlet cross section to the gas mixing chamber (39) in the diameter compared to the firing space (32) is constricted.

20. Burner system according to one of claims 17 to 19, characterized in that the gas mixing chamber (39) to a fuel gas outlet (42) associated with the flame tube (47) is connected.

21. Burner system according to one of the preceding claims, characterized in that expiring on the fuel gas outlet (42) is provided a Zuluft-, in particular fresh air supply.

22. Burner system according to claim 21, characterized in that the supply air, in particular fresh air supply to the fuel gas outlet (42) is connected to the fan chamber (24).

23. Burner system according to claim 21 or 22, characterized in that on the fuel gas outlet (42) expiring Zuluft-, in particular fresh air supply forms a fourth partial air supply.

24. Burner system according to claim 23, characterized the fourth partial air feed comprises a channel connection adjoining the outer space part (31) of the transition space (30) and passing over the gas mixing head (38).

25. Burner system according to one of claims 9 to 24, characterized in that, based on the blower device (8) required amount of air are passed through the partial air supply different amounts of air.

26. Burner system according to claim 25, characterized in that, based on the air volume required by the blower device, about 50 to 80% of the required air quantity of the combustion chamber trough (33) are supplied via the first to third partial air feeds.

27. Burner system according to claim 26, characterized in that the first and the second partial air feeds are acted upon together with about 30% of the required amount of air.

28. Burner system according to claim 26 or 27, characterized in that the first and the second partial air guides are acted upon with approximately equal proportions of the required amount of air.

29. Burner system according to one of claims 26 to 28, characterized in that the third partial air feeds with about 30 to 50, preferably about 40% of the required amount of air are applied.

30. Burner system according to one of the preceding claims, characterized in that the blower device (8) has a Forderglied (10) with circumferentially expiring, in extension of the Forderelemente (12) provided vortex bodies (22).

31. Burner system according to claim 30, characterized in that the Forderelement (12) is a Geblaserad (13).

32. Burner system according to claim 31, characterized in that the blower wheel (13) is provided in the direction of rotation flat curved blades (14) which carry in radial extension in each case an attached Wirbelkorper (22).

33. Burner system according to claim 32, characterized in that as a Wirbelkorper (22) to the blades (14) fixedly arranged chain links are provided with approximately radially extending chain link plane.

34. Burner system according to one of the preceding claims, characterized in that axially opposite to the blower device (8) a closable service opening (59) is provided.

35. Burner system according to one of the preceding claims, characterized in that expiring on the burner trough (33) a fuel supply (54) is provided.

36. Burner system according to claim 35, characterized in that the fuel feed (54) emits laterally from above onto the burner trough (33), based on the upright arrangement of the burner system with the burner trough open at the top (33).

37. Burner system according to claim 36, characterized in that distributed over the circumference of the burner trough (33) a plurality of fuel feeds (54) are provided.

38. Burner system, in particular for bio-solids fired oven, with a arranged as an upright, housing-enclosed unit formed burner part (62)

o a fuel gas outlet (42), o one against the fuel gas outlet (42) open burner trough

(33) a combustion chamber (32), o a above the burner trough (33) between this and the fuel gas outlet (42) lying gas mixing chamber (39), and o with a below the burner part (62) lying blower device (8) in a has a Forderglied with upright axis of rotation (19) and separated from the Geblaseraum (24) starting from the Gebläse (24) for the from the Forderglied (10) constructed rotating air vortex air supply to the burner part (62), characterized in that against the burner trough (33) delimited Geblaseraum (24) the housing-enclosed structural unit (1) enclosing the burner part (62) and covering a gas mixing chamber (39) receiving gas mixing head (38) has a double-shell casing with outer walls (21, 45), wherein the double-shell casing forms a Luftfuhrungskanal, the connections to the burner part (62) and to the blast space (64).

39. Burner system according to claim 38, characterized in that the formed by the double-shell casing

Luftfuhrungskanal has a on the fuel gas outlet (42) ausmundenden connection.