EP2856026B1 - Burner having surface combustion - Google Patents

Description

The invention relates to a burner with a surface combustion, which on the burner side has a membrane on a housing and upstream of a burner side comprises a flashback.

From the EP 0 378 272 A2 as well as the EP 0 628 146 B1 Such a burner is known. Such a gas burner has on an outlet side of the housing to a tissue membrane which is formed as a gas-permeable metal fiber plate. This metal fiber plate is porous and further includes through holes arranged at regular intervals from each other forming a hole pattern. The metal fiber plate is associated with a distribution component in the housing. Through a supply line, a fuel-air mixture is introduced into the housing and flows through the distribution component, so that after passing through the through holes in the metal fiber plate on the outlet side a flame field is formed, which has higher flames, which are caused by a regular pattern of these through holes. Such housing are, for example, square, as shown in the Figures 1 and 2 is shown.

Alternatively, from the WO 2011/069839 A1 known that burners can also be cylindrical. These embodiments are suitable for particular burner systems, but their application is limited.

From the JP 2000-249311 A shows a burner with a tubular housing, which comprises a plurality of passage openings along a longitudinal axis through which the gaseous medium exits. These passage openings are covered by a heat-resistant layer of metal fibers, which are held U-shaped spanned to the passage openings. Their ends are welded along and adjacent to the passage openings with the housing. This embodiment is expensive to manufacture, especially since the lateral longitudinal edges of the membrane are to be welded to a tube.

From the GB 2 437 976 A Furthermore, a burner with a tubular housing protrudes, which has a plurality of passage openings for the gaseous medium. Immediately on these openings a porous ceramic mat is provided, which are positioned and fixed by retaining strips, which in turn are welded to the housing of the burner.

The invention has for its object to provide a burner with a surface combustion, which can be used for strip-shaped or linear heating zones and allows alignment of a tissue membrane for flame arrestor.

This object is achieved by a burner which has a tissue membrane which is strip-shaped and whose length corresponds to a multiple of the width, wherein the tissue membrane has a perforated grid of at least one row of passage holes and a holding device is provided, which with the tissue membrane Distance to the flame arrester or with the interposition of a spacer element receives. Thereby, an adjustment of the through holes of the flame arrester to the through hole of the tissue membrane can be made, so that an alignment of the tissue membrane is made possible for flame flashback. As a result, an adjustment of a flame matrix in the case of striped or linear burners, which are also called ingot burners, may be possible.

A preferred embodiment of the burner provides that the tissue membrane has a ratio of its length L to its width B of L / B> 5, in particular UB> 10. As a result, strip burners can be formed whose lengths extend over several meters to, for example, five meters. Even such ingot burners are astonishingly finely adjustable in industrial machines up to 1:10.

Furthermore, it is preferably provided that the housing of the burner is tubular and the supply line for the fuel-air mixture at an end face, on a side wall or on a bottom of the housing is connected. This allows a structurally simple design of a burner with a streamlined supply of the fuel-air mixture done, which is also adaptable to the installation situation in a simple manner.

Furthermore, the flame arrestor may be integrated in a portion of the housing facing the burner side. In this case, the flame arrestor works as a prevention of the burn-back of the mixture into the burner and its subsequent destruction. The flame arrester is based on the principle of the Faraday miner's lamp. As a result, a compact and simplified construction of a burner with a reduced number of components can be achieved.

In particular, through holes are provided in the front side facing the burner side portion of the housing to form the flame arrester. Thus, no additional component is required to form the flame arrestor. Rather, this is integrally integrated in the housing.

The holding device advantageously takes up the tissue membrane by clamping. This has the advantage that expansions of the tissue membrane can be compensated during operation.

In an embodiment in which the through holes of the flame arrester are not integrated in the housing or the housing consisting of a profile body, additionally the flame arrester may be fixed to the fabric membrane adjacent or distanced by a spacer element to the housing by clamping by means of the holding device.

The holding device is preferably formed by two clamping strips, which have mirror-image mutually facing receptacles for positioning the tissue membrane. This can be done in a simple manner, the clamping attachment of the tissue membrane. In addition, a subsequent replacement of the tissue membrane is simplified by only one of the two terminal strips is to be solved.

The terminal strips of the holding device are formed according to a first embodiment as a milled part. Alternatively, these can also be formed from one or more stackable sheet metal parts, so that cost-effective stampings can be used to form the terminal strips.

This holding device is preferably releasably attached to the housing. This in turn allows easy positioning and a cost-effective structure for positioning the tissue membrane for flame arrestor.

According to a further alternative embodiment of a burner is provided that the housing consists of a rolled profile and the holding device for fixing the flame arrestor and the fabric membrane is fastened thereto. This allows a cost-effective production of the housing, with a simple adaptation to different geometries is possible. As a result, it is possible, in particular in a cost-effective manner, to form a very long housing for a strip burner.

An alternative embodiment of the burner provides that the holding device and the housing are made of a rolled material and the flame arrester and the tissue membrane are inserted into the holding device. This arrangement allows a maximum reduction of the components, since the holding device and the housing are integrally formed. The fabric membrane and flame arrester can be inserted directly one above the other or by a spacer element spaced from each other in the holding device.

The tissue membrane has a perforated grid of at least one row of preferably equally spaced through holes. As a result, a flame field in the form of a row of flames can be achieved, which can have a flame matrix with a single flame and a holding flame arranged therebetween.

The tissue membrane for the so-called inguinal burners have a one-, two- or three-row perforated grid. Preferably, the Lochrasterung the flame arrester in analogy one, two or three rows formed and corresponds in particular the Lochrasterung the tissue membrane.

To form a long strip-shaped tissue membrane, preferably a plurality of sections of the tissue membrane can be arranged with a joint joint to one another. Such a tissue membrane is, for example, according to a manufacturing method according to the DE 10 2010 051 415.2 which is incorporated by reference in its entirety and is the subject of this application. Such tissue membranes are produced in predetermined grid dimensions and then cut, which can then be arranged via a joint joint to each other. As a result, on the one hand, the formation of long strip-shaped and continuous tissue membranes is made possible. On the other hand, it is ensured by the joint joint that a passage opening is formed, which could form a flame gap along the joint joint.

The joint joint is preferably formed by two interlocking or two overlapping end portions. Both embodiments have the advantage that a quasi-continuous tissue membrane is provided, which prevents a transverse outflow of the fuel-air mixture through a gap within the joint joint.

According to a first alternative embodiment, a connecting joint is formed by two stepped or chamfered end sections, which lie against one another in a form-fitting manner. In a first embodiment, a single or multi-stage transition may be given. In a second embodiment, the beveled end portion may have a continuous or at least two diverging gradients.

To form interlocking end sections, a dovetail connection, an omega-shaped connection, a tongue and groove connection or another connection provided with an undercut can be provided. As a result, an independent entanglement can be ensured at the same time.

A further preferred embodiment of the connecting joint provides that the length of the end sections for forming the connecting joint is smaller than a hole spacing between two through holes. Thereby, the connection joint can be chosen such that the hole pattern is formed continuously with the same distance at several consecutively arranged tissue membranes.

• Figur 1 eine schematische Seitenansicht eines erfindungsgemäßen Leistenbrenners,
• Figur 2 eine schematische Ansicht auf den Leistenbrenner gemäß Figur 1,
• Figur 3 eine schematische Schnittdarstellung des Leistenbrenners entlang der Linie I-I in Figur 1,
• Figur 4 eine schematische Schnittansicht einer alternativen Ausführungsform des Leistenbrenners zu Figur 3,
• Figur 5 eine schematische Schnittansicht einer weiteren alternativen Ausführungsform zu Figur 3,
• Figur 6 eine schematische Ansicht von oben auf zwei mit einem Verbindungsstoß zueinander angeordneten Abschnitten einer Gewebemembran,
• Figur 7 eine schematische Seitenansicht der Ausführungsform zu Figur 6,
• Figur 8 eine schematische Seitenansicht einer alternativen Ausführungsform zu Figur 6,
• Figur 9 eine schematische Seitenansicht einer weiteren alternativen Ausführungsform zu Figur 6 und
• Figur 10 eine schematische Seitenansicht einer weiteren Ausführungsform zu Figur 6.

The invention and further advantageous embodiments and developments thereof are described in more detail below with reference to the examples shown in the drawings and explained. The features to be taken from the description and the drawings can be applied individually according to the invention individually or in combination in any combination. Show it:

• FIG. 1 a schematic side view of a strip burner according to the invention,
• FIG. 2 a schematic view of the ingot burner according to FIG. 1 .
• FIG. 3 a schematic sectional view of the ingot burner along the line II in FIG. 1 .
• FIG. 4 a schematic sectional view of an alternative embodiment of the strip burner to FIG. 3 .
• FIG. 5 a schematic sectional view of another alternative embodiment to FIG. 3 .
• FIG. 6 FIG. 2 is a schematic top view of two sections of a tissue membrane arranged in mutual connection with one another; FIG.
• FIG. 7 a schematic side view of the embodiment to FIG. 6 .
• FIG. 8 a schematic side view of an alternative embodiment to FIG. 6 .
• FIG. 9 a schematic side view of another alternative embodiment to FIG. 6 and
• FIG. 10 a schematic side view of another embodiment to FIG. 6 ,

In FIG. 1 is a schematic side view of the invention Burner 11 is formed, which is also referred to as Leistenbrenner. In FIG. 2 is a schematic top view of the burner 11 according to FIG. 1 shown. FIG. 3 shows a sectional view taken along the line II of the burner in FIG. 1 ,

This burner 11 comprises a housing 12, which is tubular. According to the in FIG. 3 illustrated embodiment, the housing is shown with a square cross-section. Alternatively, a rectangular or polygonal or round cross section or the like may be provided. The housing 12 is closed at one end by a closure plate 14 or by a closure. At the opposite end, the supply 16 of a fuel-air mixture takes place. Via a fuel supply line 17, which controls the amount of fuel to be supplied with a solenoid valve 18 and an air supply line 19, a fan 21 is fed with a fan wheel 22 to supply the formed fuel-air mixture to the housing 12. In the embodiment according to FIG. 1 an immediate connection of the blower 21 is provided to the housing. Alternatively, a supply line can be switched between. Various fuel gas types, in particular natural gas, liquid gas or biogas, can be supplied via the fuel supply line.

In this embodiment, a flame arrestor 24 is integrated into the housing 12. On a side facing the burner side portion 25 of the housing 12 a plurality of arranged in a row through holes 26 are arranged and form the flame arrester 24. The Lochrasterung the flame arrester 24 is preferably formed by equally spaced through holes 26. Alternatively, a separate flame arrester 24 in the form of a perforated plate with a perforated grid can be inserted or inserted within the housing 12. Furthermore, alternatively, a separate flame arrester 24 at an upper portion 25 of the housing 12 by screwing, clamping or the like in a U-shaped housing 12 or a slotted housing 12th get connected.

At the burner-side portion 25 of the housing 12, a holding device 28 is provided which receives a tissue membrane 29 and positioned at a distance from the flame arrester 24. This holding device 28 has according to a first embodiment, two strips 31, which are releasably, preferably by a screw, on the housing 12 can be fastened. These clamping strips 31 have a receptacle 32 which is formed as a U-shaped recess. In the mirror image arrangement of the terminal strips 21 to each other can be held by a clamping in the receptacles 32, the tissue membrane 29. Alternatively, these clamping strips 31 may be formed over a plurality of stacked sheet metal layers, which are also preferably secured by a screw or clamp connection releasably secured to the housing 12.

In FIG. 4 is an alternative embodiment to FIG. 3 shown. The housing 12 corresponds to the FIG. 3 , Likewise, the introduction of the through holes 26 in the housing 12 to form the flame arrester 24. In this embodiment, the terminal strips 31 of the holding device 28 are formed as sheet metal bent parts, which have a kind of s-shaped or a stepped bend or edging. The tissue membrane 29 is thereby kept clamped to the housing 12, wherein preferably between the tissue membrane 29 and the flame arrester 24, a spacer element 30 is provided. The terminal strips 31, which are formed as sheet-metal bent parts, can also be screwed to the housing 12.

Alternatively, it can also be provided in this embodiment that the housing 12 instead of individual through holes 26 has slot-shaped slots or is completely slotted. In this case, a flame arrestor 24 is used as a separate component between the spacer element 30 and the housing 12.

In FIG. 5 is another alternative embodiment of the housing 12 of the burner 11 according to the Figures 3 and 4 shown. The housing 12 and the holding device 28 are integrally formed as a rolled profile. The holding device 28 is formed as a U-shaped profiling, which merges directly into the housing 12 via a fold, wherein in the longitudinal central axis of the housing 12, a continuous gap 33 is formed. In this embodiment, for example, the tissue membrane 29 and the flame arrester 24 are held with a spacer member 30 interposed therebetween by the retainer 28, preferably clamped. These are preferably inserted at the front.

Alternatively, it can further be provided that the housing 12 and the holding device 28 are formed separately as sheet metal parts, which are then connected by a permanent connection, such as a rivet or welded joint, to subsequently by clamping the fabric membrane 29 and the Flame arrester 24 record.

The tissue membrane 29 is according to the DE 10 2010 051 415.2 manufactured and trained. This document is incorporated by reference in its entirety and is the subject of this application. Through such a tissue membrane, a combustion process is feasible, which in the DE 10 2010 051 414.4 to which reference is also made in its entirety and is the subject of this invention.

The tissue membrane 29 has through holes 34 which are arranged in a row one behind the other, preferably at the same distance from each other. The distance of the hole pattern of the through holes 34 in the fabric membrane 29 may correspond to the hole pitch of the hole pattern of the through holes 26 of the flame arrester 24. Preferably, the hole spacing of the through holes 26 of the flame arrester is half the hole spacing of the through holes 34 of the fabric membrane 29. The fabric membrane 29 is positioned to the flame arrestor 24 such that the first, third, fifth, etc. through holes 26 of the flashback arrestor with the through holes 34 of FIG Tissue membrane 29 is aligned.

Preferably, a single-row arrangement of the through holes 26 of the Flashback 24 and the through holes 34 of the tissue membrane 29 is provided. Alternatively, a two- or three-row arrangement may also be provided, wherein a double-row arrangement of the through-holes 26 and in a three-row arrangement is preferably provided analogously for a double-row arrangement of the through-holes 34, but the number of rows of the through-holes 34 may deviate from that the through holes 26 and vice versa.

In the in the FIGS. 1 to 3 In particular, the length L of the flame field forming tissue membrane 29 is a multiple of the width B of the tissue membrane 29. Preferably, the tissue membrane has a ratio of length L to width B of at least 5: 1, preferably 10: 1.

For the production of such a strip-shaped tissue membrane 29, it is provided that individual sections of the tissue membrane 29 are lined up against one another via a connecting joint 41 and form a continuously extending tissue membrane 29. In this case, the connecting joint 41 in its longitudinal extent is preferably smaller than a distance between two through holes 34, so that the connecting joint 41 can be positioned such that the hole pattern of the through holes 34 is continuous and constant regardless of the juxtaposition of two sections of the fabric membrane 29 ,

According to a first embodiment in the FIGS. 6 and 7 the joint joint 41 is formed by two stepped end portions 42, 43. Each end portion 42, 43 is reduced, for example, over a predetermined length to half the thickness, so that a kind of shiplap is formed and the end portions 42, 43 abut each other. Alternatively, the end portions 42, 43 may be chamfered and overlap by analogy.

In the FIGS. 8 to 10 Further alternative embodiments of a connecting joint 41 are shown. This embodiment according to the FIGS. 8 to 10 differs in that the end portions 42, 43 mesh with each other, whereas the connecting joint 41 according to the FIGS. 6 and 7 overlapping end portions 42, 43 comprises.

The joint joint 41 according to FIG. 8 is formed by a dovetail-shaped connection of the end portions 42, 43. The joint joint 41 according to FIG. 9 represents a modification of the dovetail-shaped compound by using an omega shape instead of the dovetail shape. FIG. 10 shows a connecting joint 41, which includes a tongue and groove connection with an undercut. Further alternative embodiments for producing an interlocking connecting joint 41 are also conceivable.

Due to the design of the connecting joint 41, the trainable length of such a burner 11 is unlimited.

Claims (15)

1. A burner providing surface combustion which comprises a housing (12) having an admission port (16) for a fuel-air mixture located on an upstream side of the burner and a fabric diaphragm (29) located downstream on an exit side thereof, said fabric diaphragm (29) being strip-shaped and the length (L) thereof corresponding to a multiple of its width (B), said burner having a flashback barrier (24) that is disposed upstream of the fabric diaphragm (29), characterised, in that the fabric diaphragm (29) has a grid of holes consisting of at least one row of through holes (34) and in that a holding device (28) is provided which accommodates the fabric diaphragm (29) in a spaced-apart relationship with respect to the flashback barrier (24) or with a spacer (30) inserted therebetween.
2. The burner as claimed in claim 1, characterised in that the fabric diaphragm (29) has a length (L) to width (B) ratio of at least 5 : 1, in particular of at least 10 : 1.
3. The burner as claimed in claim 1 or 2, characterised in that the housing (12) is tubular in shape and in that the admission port of the fuel-air mixture is provided on an end face, on a lateral wall or on a bottom surface of the housing (12) .
4. The burner as claimed in any of the preceding claims, characterised in that the flashback barrier (24) is incorporated in a portion (25) of the housing (12) facing towards the burner side and in that preferably through holes (26) are provided in the end-face portion (25) of the housing (12) facing towards the burner side.
5. The burner as claimed in any of the preceding claims, characterised in that the fabric diaphragm (29) is disposed within the holding device (28) by a clamping action and in that preferably said holding device (28) comprises two clamping strips (31) which have retainers (32) facing towards each other in a mirror-image like manner for providing a clamping fixation to the fabric diaphragm (29).
6. The burner as claimed in claim 5, characterised in that the clamping strip (31) is realised as a milled part or is formed by one or several mutually stackable sheet metal strips.
7. The burner as claimed in any of the preceding claims, characterised in that the holding device (28) is releasably attachable to the housing (12).
8. The burner as claimed in any one of claims 1 to 4, characterised in that the housing (12) is made of a rolled profile or a drawn profile and in that the holding device (28) for fixing the flashback barrier (24) and the fabric diaphragm (29) may be fastened thereon.
9. The burner as claimed in any one of claims 1 to 4, characterised in that the housing (12) and the holding device (28) are manufactured of a rolled material or a drawn material and in that the flashback barrier (24) and the fabric diaphragm (29) are slidably insertable into the holding device (28).
10. The burner as claimed in any of the preceding claims, characterised in that the fabric diaphragm (29) has a grid of holes consisting of at least one row of through holes (34) which are preferably spaced apart equidistantly from each other.
11. The burner as claimed in any of the preceding claims, characterised in that the fabric diaphragm (29) has a grid of holes consisting of one, two, or three rows and in that preferably the grid of holes of the flashback barrier (24) consists of one, two, or three rows, corresponding, in particular, to the number of rows of the fabric diaphragm (29).
12. The burner as claimed in any of the preceding claims, characterised in that several portions of fabric diaphragms (29) may be arranged by means of a connection joint (41) to form a strip, and in particular in that the connection joint (41) is formed by two end portions (42, 43) meshing with each other or overlapping each other.
13. The burner as claimed in claim 12, characterised in that the end portions (42, 43) are stepped or bevelled, abutting against each other with positive engagement.
14. The burner as claimed in claim 12, characterised in that the end portions (42, 43) are formed so as to be in interlocking engagement with each other by means of an undercut in the form of a dovetail joint, an omega-shaped joint, or a tongue and groove joint.
15. The burner as claimed in claim 12, characterised in that the connection joint (41), as considered in the longitudinal extension of the fabric diaphragm (29), is smaller than a distance between two through holes (34).

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