EP1899654B1 - Boiler - Google Patents

Abstract

The invention relates to a boiler comprising a combustion chamber which is surrounded at least in part by a combustion gas flue that is embodied as a primary heat exchanger. The combustion gas flue is enclosed at least in part by a water-conducting housing while a water-conducting secondary heat exchanger that is hydraulically connected to the housing is mounted downstream of the combustion gas flue. According to the invention, the combustion chamber is surrounded at least in part by the secondary heat exchanger.

Description

The invention relates to a heating boiler according to the preamble of patent claim 1.

A boiler of the type mentioned is manufactured and sold by the applicant under the product name "Vitolaplus" and is accordingly known (see FIG. 3 ).

The boiler "Vitolaplus" consists of a combustion chamber provided with a thermal insulation block, which is at least partially enclosed by a heating gas train designed as a primary heat exchanger. To ensure clean combustion, the combustion chamber must have a certain length, the so-called burn-out length. The aforementioned hot gas flue is further at least partially enclosed by a water-carrying housing, wherein the hot gas is followed by a water-leading, hydraulically connected to the housing, helically tubular and radially from the heating gas from the inside to the outside flowed through secondary heat exchanger. The heating gas coming from the burner thus initially flows from the combustion chamber into the heating gas flue, where it gives off heat to the water in the housing. Following the Heizgaszug the heating gas flows radially from the inside out through the flow column of the downstream, the exhaust condensing Wendelrohrwärmetausch and there again - at a correspondingly lower temperature level - heat to the secondary heat exchanger flowing through water.

From a thermal point of view, this condensing boiler has proven its worth. It has a very high standard degree of severity of up to 103%.

The invention has the object of providing a boiler of the type mentioned compact form to reduce the required space and thus the required installation space, while ensuring the required burn-out within the combustion chamber and good cleaning ability.

This object is achieved with a boiler of the type mentioned by the features listed in the characterizing part of patent claim 1.

According to the invention, it is thus provided that the combustion chamber is at least partially enclosed by the condensing secondary heat exchanger, wherein the combustion chamber comprises a combustion chamber sleeve, which is formed from the combustion chamber in the axial direction pulled out.

The proviso "at least partially" expresses the fact that not all parts of the secondary heat exchanger must surround the combustion chamber, the invention, of course, the better the realization, the larger the enclosed portion is.

In other words, the compactness of erfindungsqemäßen boiler is achieved in that at least a major part of the secondary heat exchanger encloses the combustion chamber, ie the outer dimensions of the boiler are now essentially by the mentioned, required Ausbrandlänge the combustion chamber and no longer by the size of the secondary heat exchanger Are defined. In this way, the entire boiler seen in the axial direction of the combustion chamber can be made shorter. In addition, the heat emitted by the combustion chamber is now also fed to the secondary heat exchanger, resulting in a further improvement in the use of heat results. The proposed in the prior art (Vitolaplus) silencer construction behind the combustion chamber is eliminated or is connected downstream of the secondary heat exchanger as needed.

As in the case of the Vitolaplus construction, in the solution according to the invention it is preferred, but not mandatory, for the secondary heat exchanger to be helical and radially formed by the heating gas flowing through from inside to outside. In particular, in this case, the constructively advantageous solution that the combustion chamber is surrounded by the formation of an annular space from the secondary heat exchanger, wherein the hot gas flue preferably opens directly into the annulus. This will be explained in more detail below.

Furthermore, it is provided according to the invention that the combustion chamber comprises a combustion chamber sleeve, which is designed to be pulled out of the combustion chamber in the axial direction. This requirement makes it possible in case of need, since the combustion chamber is at least partially enclosed by the secondary heat exchanger to clean this (the secondary heat exchanger) and also the heating gas when removed combustion chamber sleeve. The combustion chamber, in which, depending on the embodiment of the boiler and the thermal insulation block may be arranged (resulting in this way a combustion chamber pot), thus effectively serves as Abgasströmungsführungs- or closure element and simultaneously forms an inner boundary wall for the above-mentioned annulus and the heating gas.

The sake of completeness is still on the farther DE 34 25 667 A1 referenced, which discloses a boiler with primary and secondary heat exchanger, wherein the secondary heat exchanger 'also seen in the axial direction behind the combustion chamber is arranged, therefore a compact design is not possible because of the required Ausbrandlänge.

In addition, still a boiler according to the DE 100 26 550 C1 known, which shows the features of the preamble of claim 1, but lacking the burner opposite thermal dam block.

Other advantageous developments emerge from the dependent claims.

The boiler according to the invention, including its advantageous developments according to the dependent claims will be explained in more detail with reference to the drawing representation of two embodiments.

Figur 1

im Schnitt eine erste Ausführungsform des erfindungsgemäßen Heizkessels, bei der der Sekundärwärmetauscher auf der dem Brenner abgewandten Seite des Heizkessels angeordnet ist;

Figur 2

im Schnitt eine zweite Ausführungsform, bei der der Sekundärwärmetauscher auf der gleichen Seite wie der Brenner am Heizkessel angeordnet ist;

Figur 3

im Schnitt ein "Vitolaplus"-Heizkessel gemäß dem bekannten, vorerwähnten Stand der Technik;

Figur 4

als perspektivischen Schnitt einen Heizkessel gemäß der Ausführungsform nach Figur 1 mit in die Brennkammer eingesetzter/m Brennkammerhülse bzw. -topf; und

Figur 5

als perspektivischen Schnitt den Heizkessel gemäß Figur 4 mit herausgenommenem Brennkammertopf.

It shows

FIG. 1

in section, a first embodiment of the boiler according to the invention, in which the secondary heat exchanger is arranged on the burner side facing away from the boiler;

FIG. 2

in section, a second embodiment, in which the secondary heat exchanger is arranged on the same side as the burner on the boiler;

FIG. 3

in section a "Vitolaplus" boiler according to the known, mentioned prior art;

FIG. 4

as a perspective section of a boiler according to the embodiment according to FIG. 1 with the combustion chamber sleeve or pot inserted into the combustion chamber; and

FIG. 5

as a perspective section of the boiler according FIG. 4 with the combustion chamber pot removed.

In the FIGS. 1 and 2 are two different embodiments of the boiler according to the invention represents. Unless otherwise stated, the following discussion applies to both embodiments.

The boiler according to the invention consists of a cylindrical combustion chamber 1, which is at least partially enclosed concentrically by a trained as a primary heat exchanger flue 2 and wherein the heating gas 2 is again at least partially concentrically surrounded by a water-bearing housing 3. Here, the heating gas 2 is a water-leading, hydraulically connected to the housing 3, in this case helically formed and radially downstream of the heating gas from the inside to the outside flowed through secondary heat exchanger 4 downstream. This secondary heat exchanger 4 is arranged in a housing 6, on the one hand defines an annular space to be annotated 5 and on the other hand, another, the secondary heat exchanger 4, annular exhaust gas collection chamber 7, wherein the exhaust gas collection chamber 7 (not explicitly shown, but by the upwardly pointing arrow indicated) has exhaust gas outlet connection for the removal of the exhaust gas. If necessary, a silencer can connect to this flue outlet.

As well as in FIG. 3 illustrated, known prior art, is preferably provided in the boiler according to the invention that the secondary heat exchanger 4 is formed in the form of a helically coiled tubing having flat, radially flow-through flow gaps 8. Furthermore, to prevent corrosion damage is provided that the secondary heat exchanger 4 is made of stainless steel. In addition, a thermal insulation block 13 (for example, vermiculite) is arranged in the combustion chamber 1, which serves to deflect the Heizgasstrahles.

At a front side 9 of the combustion chamber 1, a burner 10 is always arranged (here an oil burner, a gas burner is just as possible). The access 11 from the burner chamber 1 to the heating gas 2 is optionally in the region of the burner-side end face 9 (see FIG. 1 ) or in the region of the other, burner-facing end face 12 (see FIG. 2 ) arranged.

Essential for all embodiments of the boiler according to the invention is now that the combustion chamber 1 is at least partially enclosed by the secondary heat exchanger 4.

Preferably results in the above-mentioned annular space 5, in which the hot gas flue 2 opens directly. Of course, in a alternative embodiment of the secondary heat exchanger, a less direct flow guidance can be provided by Heizgaszug to the secondary heat exchanger.

In the embodiment according to FIG. 1 The secondary heat exchanger 4 encloses the combustion chamber 1 in the area of the heat-insulating block 13 and in this way absorbs the heat emitted by the heat-insulating block 13.

The inventive design results in the same burn-out length of the combustion chamber, as mentioned above and as a comparison with FIG. 3 shows, to a much more compact designed boiler, in addition, the direct heat radiation from the combustion chamber can be used by the secondary heat exchanger. The previously required, quite expensive Design for flow of the heating gas from the primary heat exchanger to the secondary heat exchanger deleted.

How very clear from the FIGS. 4 and 5 shows, it is provided that the combustion chamber 1 comprises a jacket plate 16 and optionally a bottom plate 17 (closure plate) having combustion chamber sleeve 14 which is formed from the combustion chamber 1 in the axial direction (relative to the longitudinal axis of the cylindrical combustion chamber 1) pulled out.

How out FIG. 1 and 2 As can be seen, this solution is in principle provided in both embodiments (secondary heat exchanger 4 on the burner side or arranged away from the burner), with burner arrangement facing away from the secondary heat exchanger 4 (FIG. FIG. 1 . 4 and 5 ) the combustion chamber sleeve 14 on one side has a bottom plate (closure plate) 17 and is designed as a combustion chamber pot. To pull out the combustion chamber pot, in which preferably the thermal insulation block 13 is arranged, serves the rod-shaped handle member 18, the (see FIG. 1 ) projects into the area of the burner 10.

By pulling out (in the Aueführungsform after FIG. 2 if this is easily possible after removal of the burner-side end wall), both the combustion chamber 1 together with the hot gas flue 2 and the annular space 5 are necessary (without the combustion chamber sleeve 14, the annular space 5 becomes a cylinder space - see FIG. 5 ) are easily accessible and can be cleaned accordingly easily. This option is available at FIG. 3 illustrated prior art is not given; It has proven to be particularly advantageous with respect to the boiler according to the invention.

Structurally, it is further provided that the combustion chamber sleeve 14 forms a boundary wall of the hot gas flue 2 and the annular space 5, wherein finally the heating gas 2 from Gußsegmenten 15 with radially inwardly directed ribs whose free ends abut the combustion chamber sleeve 14 and their location in the combustion chamber 1 define.

LIST OF REFERENCE NUMBERS

1

combustion chamber

2

heating gas

3

casing

4

Secondary heat exchanger

5

annulus

6

casing

7

Flue gas plenum

8th

flow gaps

9

Front side (burner side)

10

burner

11

Access to the heating gas train

12

Front side (burner away)

13

thermal insulation block

14

combustion chamber sleeve

15

cast segments

16

shell plate

17

baseplate

18

handle element

Claims (11)

1. A boiler, comprising a combustion chamber (1) having a thermal insulation block (13) situated in the combustion chamber (1),
   the combustion chamber (1) being at least partially enclosed by a hot gas flue (2), which is implemented as a primary heat exchanger,
   the hot gas flue (2) being at least partially enclosed by a water-conducting housing (3),
   a water-conducting secondary heat exchanger (4), which is hydraulically connected to the housing (3) and through which hot gas flows, being connected downstream from the hot gas flue (2),
   characterized d in n that t
   the combustion chamber (1) is at least partially enclosed by the secondary heat exchanger (4) , the combustion chamber (1) comprising a combustion chamber sleeve (14), which is implemented so it can be withdrawn from the combustion chamber (1) in the axial direction.
2. The boiler according to Claim 1,
   characterized in that
   the secondary heat exchanger (4) is implemented in the form of a helical pipe and having heating gas flowing through it radially from the inside to the outside, in particular in the form of a pipe helix wound in a spiral, which has level flow gaps (8), which can have flow through them radially.
3. The boiler according to Claim 2,
   characterized in that
   the combustion chamber (1) is enclosed by the secondary heat exchanger (4) while forming a ring space (5).
4. The boiler according to Claim 3,
   characterized in that
   the hot gas flue (2) opens directly into the ring space (5).
5. The boiler according to one of Claims 3 to 4,
   characterized in that
   the secondary heat exchanger (4) is situated in a housing (6), which delimits the ring space (5) on one side and delimits a further exhaust gas collection chamber (7) in the form of a ring space, which encloses the secondary heat exchanger (4), on the other side.
6. The boiler according to one of Claims 1 to 5,
   characterized in that
   a burner (10) is situated on a front side (9) of the combustion chamber (1), and an access (11) to the hot gas flue (2) is alternately situated in the area of the burner-side front side (9) or in the area of the other front side (12) facing away from the burner.
7. The boiler according to one of Claims 1 to 6,
   characterized in that
   the secondary heat exchanger (4) encloses the combustion chamber (1) in the area of the thermal insulation block (13).
8. The boiler according to one of Claims 1 to 7,
   characterized in that
   the combustion chamber sleeve (14) has a floor plate (17) on one side and is implemented as a combustion chamber pot.
9. The boiler according to Claim 8,
   characterized in that
   the thermal insulation block (13) is situated in the combustion chamber pot.
10. The boiler according to one of Claims 1 to 9,
    characterized in that
    the combustion chamber sleeve (14) forms a delimitation wall of the hot gas flue (2) and the ring space (5) .
11. The boiler according to one of Claims 1 to 10,
    characterized in that
    the hot gas flue (2) comprises cast segments (15) having ribs oriented radially inward, their free ends pressing against the combustion chamber sleeve (14) and defining their location in the combustion chamber (1) .

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