EP2592340A2 - Heating device for solid fuels - Google Patents

Abstract

The trigger (1) has a set of light passages (3) arranged between two hollow bodies (2) form nozzles for flue gases. A back plate (5) is arranged at a posterior end of the hollow bodies transverse to a flow direction (10). The hollow bodies comprise suctions (4) over which the secondary air supplied by an interior of the hollow bodies flow and the flue gas is recirculated into the passages. A projection (6) is rearwardly projected to a part of the hollow bodies or to a separate control plate with an angle over the back plate such that the gases form a turning swirl (19) behind the projection. The hollow bodies are two-piece hollow bodies. Independent claims are also included for the following: (1) a solid fuel heating device (2) a method for constructing a primary trigger.

Description

I. field of use

The invention relates to a solid fuel heater such as wood, and more particularly to the primary exhaust of the flue gases from the primary combustion chamber to a downstream afterburner.

II. Technical background

• In der primären Brennkammer wird zwar ein Großteil des festen Brennstoffes verbrannt, jedoch enthalten die dort entstehenden Rauchgase noch einen großen Anteil an kohlenstoffhaltigem, brennbaren Gas, welches noch verwertbar ist. Deshalb werden die Rauchgase einer Nachbrennkammer zugeführt und dort - mit zusätzlich zugeführter Verbrennungsluft, der Sekundärluft - nachverbrannt, um die Ausnutzung des Brennstoffes und damit die Effizienz der Heizvorrichtung zu erhöhen.

It is known to carry out a multi-stage combustion of solid fuels such as wood:

• In the primary combustion chamber, although a large part of the solid fuel is burned, but the resulting flue gases still contain a large proportion of carbonaceous, combustible gas, which is still recyclable. Therefore, the flue gases are fed to a secondary combustion chamber and there - with additionally supplied combustion air, the secondary air - afterburning to increase the utilization of the fuel and thus the efficiency of the heater.

It is also known in the primary exhaust of the flue gases from the primary combustion chamber to the afterburner to allow the flue gases to flow through a nozzle assembly while the secondary air, ie the additional necessary combustion air to supply - possibly also additionally recirculated flue gas, - whereby a good mixing of Flue gases with the secondary air and thus a very complete combustion of the combustible components in the flue gas takes place in the afterburner.

Thus, the primary train often consists of a kind of rust - even if it is vertical, since the flow direction in the primary train runs horizontally - from adjacent juxtaposed hollow bodies, through the interior of the secondary air is supplied and discharged through outlet openings in the passages between the hollow bodies. These passages are Favor by the increasing in the flow direction cross sections of the hollow bodies narrowing passages and act as a nozzle, so that the acceleration of the flue gases sucking in the secondary air without additional fan or the like automatically sucks into the flue gas stream.

• Die Strömungsgeschwindigkeit sollte möglichst hoch sein, um aus den Austrittsöffnungen der Hohlkörper möglichst viel Sekundärluft selbsttätig anzusaugen.

The flow velocity of the gas mixture in the passage is a very critical quantity:

• The flow rate should be as high as possible to automatically suck as much secondary air from the outlet openings of the hollow body.

On the other hand, the flow rate must not exceed a certain limit, otherwise the flame passing through the primary exhaust tearing off the flame, and thus the combustion in the afterburner is first interrupted, usually a short time later by deflagration is set in motion, what to avoid applies.

In this case, the critical flow rate at which flame separation occurs depends on the temperature of the flame, and the total flow rate depends, inter alia, on the amount of combustion gases produced in the main combustion chamber:

The amount of fuel gas depends, of course, on the one hand on the amount of wood introduced, but also on other factors, such as whether the fuel is just at the beginning of the combustion and the temperature is rising, because in this phase are usually more gases released per unit of time than with a completely glowing fuel.

• So gibt Scheitholz am Anfang mehr Brenngas frei als beispielsweise die stark gepressten Pellets. Die nicht gepressten Hackschnitzel liegen hier etwa in der Mitte.

The type of fuel also influences the gas evolution:

• Thus, firewood releases more fuel gas at the beginning than, for example, the heavily pressed pellets. The unpressed wood chips are here about in the middle.

Also already known, for example, from the DE 4435794 C2 in that the side walls of these hollow bodies running in the direction of flow have a projection over the back plate to the rear.

This supernatant causes a sweeping vortex of the flowing gas mixture to be established on the rear side of the hollow bodies near the projections. The laminar gases flowing through the nozzle arrangement are thereby swirled, so that in this case a particularly good mixing of the gas components, ie the flue gases with the secondary air, occurs, which improves the completeness of the afterburning.

The most complete afterburning of both the gaseous combustible constituents and the partially invisible small solid constituents in the flue gases is not only necessary in terms of increasing efficiency, but rather depends very much on the fine dust content of the exhaust gas ultimately escaping the heater.

Since the regulations for the fine dust content of such solid fuel heaters are constantly tightened, the fines content is always growing problem due to its harmful effects.

At the same time, however, there can be no optimal heating device and no optimal primary extraction, with the generally optimal complete combustion and optimal low particulate matter content is achieved, because here play many parameters such as type of fuel, its moisture content, amount of primary air and secondary air, strength of by the chimney generated negative pressure, altitude of the burning device, there prevailing weather conditions, etc. a role, so that the heater and in particular the primary shred must be individually adapted to these conditions to optimum combustion, so an optimally low fines content and optimal high efficiency , to reach.

III . Presentation of the invention a) Technical task

It is therefore the object of the invention to provide a heating device and in particular a primary extract as well as a method for adjusting such a primary extraction, which enables optimization of the combustion depending on the specific operating conditions of the heating device.

b) Solution of the task

This object is solved by the features of claims 1, 10, 11 and 13. Advantageous embodiments will be apparent from the dependent claims.

By the cross section of the hollow body - which widened from front to back at least in part of its longitudinal extent - has a projecting rearwardly over the back plate and in particular protruding into the passage between two hollow body supernatant, this can be chosen so that - in particular depending on the Flow velocity of the gases flowing through - behind the supernatant forms on each side of a sweeping vortex of the gases flowing therethrough, and thereby the turbulence is further improved.

• Entweder können diese einstückig ausgebildet sein, dann muss ein passend gestalteter Hohlkörper, also mit passendem Überstand, für die jeweilige Verbrennungssituation gewählt werden.

For this purpose, there are basically two ways of designing the hollow body:

• Either these can be formed in one piece, then a suitably shaped hollow body, so with a suitable supernatant, must be selected for the particular combustion situation.

Or the hollow body are formed in two parts, namely consisting of a closed to the outlet openings for the secondary air front part and on the back of the front part, so its back plate, releasably secured and in particular adjustable control plate.

The aim is that the supernatant is angled back to the hollow bodies or the control plate either opposite to the forward adjoining region of the side surface and more projecting into the passage between the hollow bodies in and / or between the supernatant and the front part of the hollow body in Direction passage in protruding paragraph is available and / or a separate control plate whose distance to the back of the front part is changeable.

Both promote the transition from a laminar flow of flue gases in the primary exhaust into a turbulent flow thereafter, which benefits a better turbulence and both also change the remaining passage width between the hollow bodies.

In the two-part design of the hollow body, one, two or all three parameters can be changed by a corresponding, adjustable attachment of the control plate on the back of the hollow body also from the outside and also during operation of the burner.

Thus, the control plate can also be variable in width, for example by being composed of at least two parts that are movable relative to each other, or it can be changed in its angle by being attached to the back of the front part.

Since the hollow body of a very high temperature load and thus also subject to temperature interaction depending on the heating state of the heater, a positive relative guidance between the front part and the control plate is preferable.

Thus, for example, the front part in the flow direction rearwardly spaced extensions beyond the back plate have, which fit into corresponding recesses of the control plate, whereby it is guided.

The adjustment of angle, distance and width of the control plate can be realized by taking place from behind through the control plate against the back of the front part attachments, in particular glands.

• Im klassischen Fall kann die Sekundärluft durch Austrittsöffnungen in den Seitenflächen der Hohlkörper in die Durchlässe hinein austreten.

There are also different possibilities for the flow of secondary air:

• In the classical case, the secondary air can escape into the passages through outlet openings in the side surfaces of the hollow bodies.

Alternatively or additionally, in a two-part hollow body outlet openings in the back plate of the front part may be present, so that the secondary air enters the distance between the back plate and control plate and from there through the gap or in the longitudinal direction of the hollow body only partially existing gap between the front part and control plate in the passages exit and / or through outlet openings in the control plate, in particular in the supernatant, in the space behind it, ie in particular in the space in which form the sweeping vortex of the gases flowing therethrough.

Such a primary extraction can thus be adjusted by selecting the right hollow body, in the case of two-part hollow bodies, in particular the correct control plate, first to the corresponding firing situation.

When using the two-part hollow body can also be done by adjusting the parameters such as width of the control plate, angle to the back plate of the front part, distance to the front part, etc. additionally fine adjustment to the particular burning situation.

Thus, especially when using two-piece hollow body, the present invention also provides a kit for creating a tailored to the burning primary shred in which it includes several different types of hollow bodies, especially for two-piece hollow bodies at least one sort of front parts and several types of control plates including the necessary connecting devices to connect the two together.

• Vorzugsweise sind die Austrittsöffnungen als etwa in Verlaufsrichtung der Hohlköper liegende, aber leicht schräg dazu stehende, Langlöcher ausgebildet. Anfang und Ende zweier benachbarter Langlöcher überlappen sich dabei vorzugsweise in Verlaufsrichtung der Hohlkörper.

The design of the outlet openings for secondary air, which are arranged in particular in the side walls of the hollow body, is important for the mixing:

• Preferably, the outlet openings are formed as lying approximately in the direction of the hollow body, but slightly obliquely thereto, elongated holes. The beginning and end of two adjacent elongated holes preferably overlap in the direction of the hollow body.

If they do not overlap, but a gap in the direction of the hollow body is present, is - preferably upstream in the flow direction - upstream, a separate, additional outlet opening, which preferably has a round or elongated cross-section, over the entire direction of extension of the hollow body secondary air in the Let pass through the passage.

c) embodiments

Fig. 1:

eine Heizvorrichtung nach dem Stand der Technik,

Fig. 2:

einen Primärabzug mit einer ersten Bauform von Hohlkörpern,

Fig. 3a-d:

einen Primärabzug mit weiteren Bauformen von Hohlkörpern,

Fig. 4:

einen Hohlkörper in einer dritten Bauform,

Fig. 5:

einen Hohlkörper in einer vierten Bauform, und

Fig. 6:

einen vollständigen Primärabzug.

Embodiments according to the invention are described in more detail below by way of example. Show it:

Fig. 1:

a heating device according to the prior art,

Fig. 2:

a primary pullout with a first type of hollow bodies,

Fig. 3a-d:

a primary feeder with further types of hollow bodies,

4:

a hollow body in a third design,

Fig. 5:

a hollow body in a fourth design, and

Fig. 6:

a complete primary expulsion.

• Dabei wird Brennmaterial, beispielsweise Holzscheite, auf den Boden eines Brennraumes 20 liegend verbrannt.

The FIG. 1 shows in the sectional side view a known heater:

• In this case, fuel, such as logs, burned lying on the floor of a combustion chamber 20.

In the front surface of the housing of the combustion chamber 20, a combustion chamber flap 22 is present, which can be wound up, operated via a manual control 25, which is coupled in this case with a direct exhaust flap 16 in the ceiling of the firebox 20, which is normally closed and only when the combustion chamber flap 22 is opened, it is also open to allow the flue gases 14 to be drawn off directly into the chimney 26 via the ceiling of the combustion chamber 20.

In the normal case, however, ie with the combustion chamber flap 22 closed, the flue gases from the combustion chamber 20 pass through a primary exhaust 1 into the afterburner 21 and are accompanied by additional combustion air or by a recirculation path 15 from the combustion chamber 20 or via recirculation openings 23 from the afterburner 21 recirculated flue gas added to optimize the post-combustion.

This is done by the primary pullout 1 arranged in this case superimposed, horizontally extending, hollow bodies 2, between which light passages 3 are present, which narrow in the flow direction 10 and act as nozzles.

Via outlet openings 4 in the hollow bodies 2 secondary air is discharged into these passages 3 and thus mixed with the flue gases 14 flowing from the combustion chamber 20.

The flue gases afterburned in this way in the afterburning space 21 leave the heating device in the direction of the chimney 26, wherein the chimney effect can be regulated by a regulation flap 18 arranged at the end of the afterburning space 21.

In the afterburner 21, the rear wall is further formed as a liquid-flowed heat exchanger 27.

• Figur 2 zeigt eine Schnittdarstellung durch einen Teil eines Primärabzuges 1 bestehend aus beispielhaft drei nebeneinander stehenden Hohlkörpern 2, deren Querschnitt etwa A-förmig ist, so dass sich die Durchlässe 3 dazwischen in Strömungsrichtung 10 verjüngen und als Düse wirken.

The invention is based on - consisting of one above the other or side by side - hollow bodies primary shred 1, which is shown in full or in part in the following figures in detail:

• FIG. 2 shows a sectional view through a portion of a primary pullout 1 consisting of example three adjacent hollow bodies 2, whose cross section is approximately A-shaped, so that the passages 3 taper therebetween in the flow direction 10 and act as a nozzle.

In this case, the hollow body 2 consist of a V-shaped bent sheet, which forms the top and side walls, and one in the open back of this sheet, set back from its free ends, tightly inserted, in particular welded back plate 5, which together form a hollow Provide interior through which secondary air and / or recirculation gas can be supplied, which is then discharged through outlet openings 4 in the side walls of the hollow body 2 in the passages 3 and thus the flue gas 14 flowing therethrough.

Because of the supernatant 6 on the back plate 5 out back the flowing through the nozzle-like passages 3 gas mixture behind the back plate 5 each on each side a sweeping vortex 19, whereby a particularly intensive mixing of the flue gases 14 with the supplied secondary air and / or the recirculation gases the hollow bodies 2 is achieved and thus leads to an improved afterburning in the afterburner 21.

The following figures show solutions in which the majority consist of a circumferentially substantially closed front part 2 ', in which the side walls do not protrude beyond the back plate 5 to the rear, and in addition directly to or at a distance behind the back plate 5 arranged control plate 8, then the supernatant 6, which has obliquely backwards and outwards, is arranged.

In the design of the FIG. 3a protrude from the back of the back plate 5 from one or more threaded bolts on which / the control plate 8 with a corresponding hole attachable and by means of, for example, two nuts 29 or a nut 29 and shims in the desired distance 9 is fixed.

If instead a threaded rod is used, which can be screwed in one part - back plate 5 or control plate 8 - in the other part but with a non-threaded portion axially fixed freely rotatable, by rotation of the threaded rod - also from the outside, even during the firing process - the distance 9 are adjusted.

In addition, as well as in the sectional view of Figure 3c shown - in the longitudinal course, ie in the direction of the FIG. 3a , the hollow body 2 are formed on the side walls of the front part 2 'to the rear over the back plate 5 protruding projections 12 which protrude through matching formed in the control plate 8 recesses 13 and thereby the positive guidance and fixation of the two parts, ie front part 2' and control plate 8 with the two extensions 6 - ensures each other, even if these made of sheet metal parts should forgive at the prevailing high temperature load.

In accordance with the function of the hollow body 2, outlet openings 4 are also present in its front part 2 in its side walls and / or its back plate 5.

The secondary air flowing out of the outlet openings 4 of the back plate 5 firstly reaches the distance 9 between the back plate 5 and the control plate 8 and is sucked from there transversely to the flow direction 10 into the passages 3 and thus the flue gas 14 flowing through. In addition, one or more outlet openings 4 may be present in the control plate 8, as in FIG. 3a shown only in the right half or in particular in the supernatant 6, as in FIG. 3b shown on the left.

This suction and the dependent of a variety of different factors in each application, training of the sweeping vertebra 19 is on the one hand by the length and angle of the supernatant 6 relative to the control plate 8 and / or by the distance 9 between the back plate 5 and control plate 8 and / or the size of the shoulder 7 in the transverse direction 11 to the flow direction 10 between the rear, widest point of the front part 2 'and the outer end of the central part of the control plate 8, so the corner between the control plate 8 and projection 6, influenced.

In particular, this paragraph 7 is even easier to adjust, shows FIG. 3b a solution in which this distance 9 is set by from the back of the control plate 8 forth - distributed in this case over the width of the front part 2 '- screwed through screws which are screwed into a corresponding threaded hole in the back plate 5 of the front part 2' and the distance 9 is maintained by preferably around the screw shafts between the back plate 5 and control plate 8 acting compression springs, for example in the form of disc springs 30, are arranged.

• Dabei sind jeweils zwei Langlöcher als Austrittsöffnungen 4a beabstandet in Linie schräg stehend zur Strömungsrichtung 10 angeordnet und auf der Lotrechten zu dieser Langlocherstreckung über der Lücke zwischen den beiden langlochförmigen Austrittsöffnungen 4a eine kreisförmige oder langlochförmige Austrittsöffnung 4b, deren Durchmesser mindestens so groß ist wie die Lücke zwischen den beiden langlochförmigen Austrittsöffnungen 4a.

3d figure also shows in the plan view of a side surface of a front part 2 ', a specific arrangement of outlet openings 4 for the secondary air:

• In this case, each two slots are arranged as outlet openings 4a spaced in line obliquely to the flow direction 10 and on the perpendicular to this Langlocherstreckung over the gap between the two slot-shaped outlet openings 4a a circular or slot-shaped outlet opening 4b, whose diameter is at least as large as the gap between the two slot-shaped outlet openings 4a.

Such groups of outlet openings 4a, b are arranged many times in succession in the direction of flow 10, so that there is no area transverse to the flow direction 10 which is not covered by outlet openings 4 in the desired outlet area.

As well in FIG. 3a as well as in FIG. 3b is the supernatant 6 of the control plate 8 more inclined to the flow direction 10 than the side surfaces of the front part 2 ', whereby the nozzle effect is amplified in the passage 3.

The FIGS. 4a , B show a further design of the hollow body 2, again consisting of a front part 2 'and a contrast to separate control plate 8 with lateral projections. 6

However, here is the control plate 8 along the longitudinal center line of the hollow body 2 divided into two control plate parts 8a, b, each by itself through a through the control plate part 8a or 8b inserted and screwed with the thread in a corresponding threaded hole in the back plate 5 screw the back plate 5 are screwed.

• Dies wird erreicht, indem die Schraube sich durch die Steuerplattenteile 8a, b durch entsprechende Langlöcher 32 hindurch erstrecken, die in Querrichtung 11 zur Längserstreckung der Hohlkörper 2, also der Blickrichtung in Figur 4a, verlaufen, wie in Figur 4b dargestellt.

In this case, the control plate parts 8a, b forwardly in the direction of the front part 2 'on both sides of the screw projecting spacers 31, so that the distance 9 between the two parts is not variable, but probably the paragraph 7, by which the control plate part 8a, b protrudes laterally beyond the front part 2 'and thus the width 28 of the control plate 8:

• This is achieved by the screw extending through the control plate parts 8a, b through corresponding slots 32, which in the transverse direction 11 to the longitudinal extension of the hollow body 2, so the viewing direction in FIG. 4a , run, like in FIG. 4b shown.

Also in the FIGS. 4a, b is the supernatant 6 to the flow direction 10 more inclined than the side wall of the front part 2 '. The front part 2 points in In this case, outlet openings 4 only in the side walls and not in the back plate 5.

While in FIG. 4a the front part 2 'has a cross section which widens from the front to the rear end and is approximately triangular, it has in Figure 4c a pentagonal cross-section, which points with a corner against the direction of flow and thus widens only in the front area, in contrast, in the rear area again narrower.

The FIGS. 5a, b, c show a further design of a hollow body 2, in turn with front part 2 'and on the other hand separate control plate 8, which is also here in two parts consisting of two control plate parts 8a, b formed.

The control plate parts 8a, b are considered in the longitudinal direction of the hollow body 2, ie in the viewing direction z. B. the FIG. 5a or c formed as angled plates, each consisting of the actual control plate part, for example, 8b and the cranked adjoining supernatant 6, wherein the bend between them at the back of the control plate 5 of the front part 2 'is applied.

The pointing to the center of the hollow body 2 free ends of the control plate parts 8a, b overlap each other on the longitudinal center line (see FIG. 5b ) and form by appropriate mutual design between them a slot 32 through which in turn a screw from the back of the control plate parts 8a, b can be screwed into a corresponding thread of the back plate 5, whereby also here a compression spring, preferably a plate spring 30, between the back plate 5 and the control plate parts 8a, b is arranged.

When unscrewing the screw to the rear, the control plate parts 8a, b are pivoted so that their supernatant 6 increasingly protrudes into the passage 3 in, and vice versa.

This effect is stronger, the longer the outer leg, so the supernatant 6, compared to the actual control plates, parts 8a, b and / or the closer the pivot point of the control plate 8a, b lies in the direction of the longitudinal center of the front part 2, ie in FIG. 5c stronger than in FIG. 5a ,

The FIG. 6 1 shows a primary extraction 1 with two rows of hollow bodies 2 arranged behind one another in the flow direction 10 and a lateral boundary which likewise narrows in the flow direction 10, at least in the region of the second row of hollow bodies 2.

In this case, the hollow bodies 2 are arranged in the two rows so that the hollow bodies 2 of the second row are located exactly in the gaps between the hollow bodies 2 of the first row.

The hollow body 2 of the first row are in the design of FIG. 2 shown; those in the second row in the design of the FIG. 3b which is not mandatory.

Preferably, all hollow bodies 2 in all figures are each designed symmetrically to their longitudinal center plane.

LIST OF REFERENCE NUMBERS

1

primary deduction

2

hollow body

2 '

front part

3

passage

4

outlet opening

5

backplate

6, 6 '

Got over

7

paragraph

8th

control plate

8a, b

Control Panel Parts

9

distance

10

flow direction

11

transversely

12

extension

13

recess

14

flue gas

15

recirculation

16

Direct exhaust damper

17

swivel axis

18

regulation flap

19

periodic vortex

20

combustion chamber

21

secondary combustion

22

Combustion chamber door

23

recirculation

24

partition wall

25

hand control

26

fireplace

27

heat exchangers

28

width

29

mother

30

Belleville spring

31

spacer

32

Long hole

33

Passage width

Claims (14)

Primary discharge (1) for a solid fuel heater, with - spaced tubular hollow bodies (2), - Wherein the clear passages (3) between the hollow bodies (2) in particular nozzles for the passing flue gases form by the hollow body (2) in the flow direction (10) of the flue gases have from front to rear widening outer contour, and one at the rear End of the hollow body (2) transversely to the flow direction (10) standing back plate (5), - The hollow body (2) outlet openings (4), via which via the interior of the hollow body (2) supplied secondary air and / or recirculated flue gas flows into the passages (3),
characterized in that
a projection (6) rearwardly beyond the back plate (5), which is part of the hollow body (2) or a separate control plate (8) so far and protrudes at such an angle that the gases flowing therethrough behind the supernatant (6) form a sweeping vortex (19). Primary train according to claim 1,
characterized in that - The hollow body (2) are integrally formed and the rear projection (6) relative to the front part of the side surfaces (2 a, b) is angled or - Between the supernatant (6) and the front part of the side wall in the passage (3) projecting paragraph (7) is arranged. Primary train according to one of the preceding claims,
characterized in that
the hollow body (2) are formed in two parts with a closed up to the outlet openings (4) front part (2 ') and on the back of the back plate (5) of the front part (2') releasably fastened control plate (8) having a peripheral projection (6 ') to the rear and in particular in their distance (9) to the front part (2') is adjustable. Primary train according to one of the preceding claims,
characterized in that
the control plate (8) consists of at least two parts (8a, b) and in its width (28) is adjustable transversely to the longitudinal course of the hollow body (2). Primary train according to one of the preceding claims,
characterized in that
the two parts (8a, b) of the control plate (8) in the direction of the width (28) are apart or zusammenschiebbar. Primary train according to one of the preceding claims,
characterized in that
the two parts (8a, b) of the control plate (8) are angled and abut with the outside of the angle on the back of the back plate (5) and by pivoting about this contact point, the width (28) of the control plate (8) is adjustable. Primary train according to one of the preceding claims,
characterized in that
the front part (2 ') has air passage openings (4') in its back plate (5) and / or the control plate (8) has air passage openings (4 ') in the middle part between the extensions (6) and / or the extensions (6). Primary train according to one of the preceding claims,
characterized in that
the front part (2 ') having longitudinally spaced extensions (12) rearwardly beyond the back plate (5) standing out, which fit into corresponding recesses (13) of the control plate (8). Primary train according to one of the preceding claims,
characterized in that
the cross section of the hollow body (2) increases from the front to the rear over the entire length or even in partial areas of the length or even decreases. Kit for creating a primary expulsion (1), with - At least one kind of front parts (2 '), and - several types of control plates (8). Heating device for solid fuels, with
a combustion chamber (20) which is connected via a primary discharge (1) to a secondary combustion chamber (21) in which the flue gases flowing out of the combustion chamber (20) are burned,
characterized in that
the primary pullout (1) corresponds to one of the preceding claims. Heating device according to claim 11.
characterized in that
the primary pullout (1) in the flow direction (10) has a plurality of rows of hollow bodies (2) lying one behind the other, and in particular in the transverse direction (11) the hollow bodies (2) of adjacent rows are arranged offset to one another. Method of creating a primary expulsion, with - Hollow bodies (2) via the secondary air and / or flue gas is supplied, with outlet openings (4), - a control plate (8) in the flow direction (10) behind the front part (2 ') of the hollow body (2),
characterized in that - The distance (9) of the front part to the control plate (8) when air in between and / or - The width (28) of the control plate (8) and / or - The angle (α) of the extension (6) of the control plate (8) to the flow direction (10) and thereby the passage width (33) is adjusted. Method according to claim 13,
characterized in that
the appropriate type of control plate (8) is selected.15. Method according to claim 13 or 14,
characterized in that - To decrease the CO content and / or the particulate matter in the exhaust gas, the distance (9) is increased and / or the passage width (33) is reduced, in particular by increasing the angle α of the extensions (6) to the flow direction, - To increase the CO2 content of the exhaust gas, the distance (9) is increased and / or the distance (33) is reduced, in particular by increasing the angle α of the extension (6) to the flow direction (10).

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