U.S. patent application number 12/084584 was filed with the patent office on 2009-10-08 for burner arrangement.
This patent application is currently assigned to GVP Gesellschaft zur Vermarktung der Porenbrennertechnik mbH. Invention is credited to Martin Moederer, Dietmar Tanke, Joerg Tom Felde, Jochen Volkert.
Application Number | 20090253086 12/084584 |
Document ID | / |
Family ID | 37781759 |
Filed Date | 2009-10-08 |
United States Patent
Application |
20090253086 |
Kind Code |
A1 |
Volkert; Jochen ; et
al. |
October 8, 2009 |
Burner Arrangement
Abstract
The invention relates to a burner arrangement comprising a
burner plate (1) having a multiplicity of apertures (2) and a
monitoring device for monitoring the formation of a combustion zone
(3) extending from the burner plate (1), wherein the monitoring
device comprises a cathode (5) provided on a flame-side top (4) of
the burner plate (1) and an anode (7) arranged in the region of the
combustion zone (3). To improve the thermal stability and thus the
durability, provision is made according to the invention for the
burner plate (1) to be made of a non-metallic material and for the
cathode (5) to be arranged as a separately designed component in
the region of the top (4) of the burner plate (1).
Inventors: |
Volkert; Jochen;
(Hartmannshof, DE) ; Tom Felde; Joerg; (Nuernberg,
DE) ; Moederer; Martin; (Burgthann, DE) ;
Tanke; Dietmar; (Uttenreuth, DE) |
Correspondence
Address: |
KANESAKA BERNER AND PARTNERS LLP
1700 DIAGONAL RD, SUITE 310
ALEXANDRIA
VA
22314-2848
US
|
Assignee: |
GVP Gesellschaft zur Vermarktung
der Porenbrennertechnik mbH
Erlangen
DE
|
Family ID: |
37781759 |
Appl. No.: |
12/084584 |
Filed: |
November 24, 2006 |
PCT Filed: |
November 24, 2006 |
PCT NO: |
PCT/EP2006/011289 |
371 Date: |
May 6, 2008 |
Current U.S.
Class: |
431/66 |
Current CPC
Class: |
F23N 5/12 20130101; F23D
2203/102 20130101; F23D 2212/10 20130101; F23C 99/006 20130101;
F23D 14/725 20130101 |
Class at
Publication: |
431/66 |
International
Class: |
F23N 5/00 20060101
F23N005/00 |
Foreign Application Data
Date |
Code |
Application Number |
Nov 25, 2005 |
DE |
10 2005 056 629.4 |
Claims
1. Burner arrangement with a burner plate (1) having a plurality of
breakthroughs (2) and a monitoring unit to monitor the formation of
a combustion zone (3) extending from the burner plate (1), wherein
the monitoring unit comprises a cathode (5) on a top side (4) of
the burner plate (1) pointing towards the combustion zone (3) and
an anode (7) extending into the area of the combustion zone,
characterized in that the burner plate (1) is made of a
non-metallic material and the cathode (5) is located as a
separately formed component in the area of the top side (4) of the
burner plate (1).
2. Burner arrangement as defined in claim 1, wherein a volume
burner body (9) with a combustion-enabling, communicating porous
space is located opposite the top side (4).
3. Burner arrangement as defined in claim 1, wherein a slit (11) of
a specified width is provided between the top side (4) and a bottom
side (10) of the volume burner body (9).
4. Burner arrangement as defined in claim 1, wherein the volume
burner body (9) and/or the burner plate (1) is/are made of a
ceramic material.
5. Burner arrangement as defined in claim 1, wherein the cathode
(5) is located in the slit (11).
6. Burner arrangement as defined in claim 1, wherein the cathode
(5) is contained in a recess (6) opening towards the top side (4)
of the burner plate (1).
7. Burner arrangement as defined in claim 1, wherein at least some
of the breakthroughs (2) provided in the burner plate (1) open in
the recess (6).
8. Burner arrangement as defined in claim 1, wherein the cathode
(5) extends from the recess (6) into a further bottom side (8) of
the burner plate (1) opposite the top side (4).
9. Burner arrangement as defined in claim 1, wherein the cathode
(5) is contained in a recess (6) which opens towards the bottom
side (10) of the volume burner body (9).
10. Burner arrangement as defined in claim 1, wherein the recess
(6) is formed corresponding to the form of the cathode (5).
11. Burner arrangement as defined in claim 1, wherein the cathode
(5) is formed from a perforated plate or preferably a spiral or
meandering-shaped wire.
12. Burner arrangement as defined in claim 1, wherein the burner
arrangement is part of a gas burner.
Description
[0001] The invention relates to a burner arrangement as defined in
the preamble of claim 1.
[0002] Such a burner arrangement is generally known in accordance
with the state of technology. In particular, gas burners are
equipped with a nozzle or burner plate made of metal. During
operation of the gas burner, a gas flowing through the nozzles is
burnt. In this connection, flames extend from a top side of the
burner plate. During operation, it can happen, among other things,
that the flames are extinguished by a gust of wind, for example. In
this case, gas would escape through the nozzles. In a closed room,
for example, this can create an explosive mixture of gas and air.
To avoid this, a monitoring unit is provided on the burner plate to
monitor the extinguishment of the flames extending from the burner
plate. In the monitoring unit, the metallic burner plate serves as
the cathode. An anode is provided above the cathode in the area of
the flames. The extinguishment of a flame can be detected based on
a significant change in the electrical conductivity between the
cathode and the anode and, as a result of this, a safety shutoff
valve installed in a gas feeder line can be closed. Such gas
burners which burn the gas by creating an open flame do not make
optimal combustion possible, among other things.
[0003] From DE 43 22 109 A1 a so-called gas pore burner is known.
In this connection, the gas is burned in a volume burner element
made of porous ceramic. The suggested gas pore burner makes
possible particularly clean combustion. Due to the provision of a
volume burner element, an undesirable breakdown of the combustion
reaction will almost never occur during operation.
[0004] However, also with such a gas pore burner the undesirable
escape of combustible gas is still possible, for example, due to a
defective ignition unit.
[0005] The object of the invention is to eliminate the
disadvantages as per the state of technology. In particular, a
burner arrangement is to be specified which makes low-pollution
combustion possible and, at the same time, the quick and reliable
detection of the undesired escape of unburnt fuel.
[0006] This object is solved by the features of claim 1. Useful
embodiments of the invention result from the features of claims 2
to 12.
[0007] According to the provisions of the invention, it is provided
that the burner plate is made from a non-metallic material and the
cathode is located as a separately formed component in the area of
the top side of the burner plate.
[0008] Due to the use of a non-metallic material, a ceramic
material for example, to make the burner plate, the temperature
resistance and thus the durability of such a formed burner
arrangement is improved. The provision of a cathode designed as a
separate component makes possible the creation of the monitoring
unit to monitor the formation of a combustion zone extending from
the burner plate. The suggested burner arrangement makes possible
quick and reliable detection of the extinguishment of a flame, a
faulty ignition or similar. The suggested burner arrangement is
suitable for the implementation of both surface and volume burners.
Such burners make particularly clean fuel combustion possible. The
term "fuel" is understood to mean in particular gaseous fuels, for
example combustible gases, vaporized liquid fuels, for example
mixtures of vaporized oil and air, alcohol/air mixtures and
similar.
[0009] According to an advantageous embodiment, it is provided that
a volume burner body with a combustion-enabling, communicating pore
area is located opposite the top side. The provision of such a
volume burner body makes possible a simple and inexpensive way to
make a volume burner. In this case, the combustion of the fuel
occurs essentially within the volume burner body. In this
connection, a slit with a specified width can be provided between
the top side and a bottom side of the volume burner body. The width
of the slit is usefully 0.5 to 15 mm, preferably 1 to 5 mm. The
provision of the suggested slit simplifies ignition.
[0010] According to a further advantageous embodiment, the volume
burner body and/or the burner plate is/are made of a ceramic
material. In this connection, this can be porous ceramic, a
perforated plate, a ceramic foam or similar.
[0011] According to a useful embodiment, the cathode is located in
the slit. It can lie on the top side, for example. But it is
considered as particularly advantageous when the cathode is
contained in a recess which opens towards the top side of the
burner plate. In this case, an undesirable strong heating up of the
cathode during the operation of the burner arrangement is avoided.
This makes possible a particularly precise detection of a
malfunction.
[0012] It is useful that at least some of the breakthroughs
provided in the burner plate open in the recess. Due to this, the
cathode contained in the recess is surrounded by still unburnt gas
and thus cooled.
[0013] The recess is preferably designed deep enough so that the
cathode can be completely contained in it. In other words, the
cathode does not protrude out of the recess over the top side, in
particular, not in the area of the combustion zone.
[0014] According to a further embodiment, it is provided that the
cathode extends from the recess to a further bottom side of the
burner plate opposite the top side. This makes possible a simple
way to conduct off the heat from the cathode to the opposite
further bottom side which is cool.
[0015] According to a further embodiment, it is possible that the
cathode is contained in a recess which opens towards the bottom
side of the volume burner body. Besides this, it is also
conceivable that to some extent the cathode is partially contained
in a [lacuna] on the top side of the burner plate as well as in a
[lacuna] on the bottom side of the volume burner body.
[0016] According to a further embodiment, it is provided that the
recess is formed corresponding to the shape of the cathode. This
provides a simple and inexpensive way to prevent undesired strong
heating up of the cathode.
[0017] The cathode can be formed from a perforated plate or,
preferably a spiral or meandering-shaped, bent wire. It is usefully
made of a temperature-resistant metal.
[0018] The suggested burner arrangement is usefully used with gas
burners in particular.
[0019] Examples will now be used to describe the invention in more
detail based on the drawings. The figures are listed below:
[0020] FIG. 1 A perspective view of a first burner arrangement,
[0021] FIG. 2 A sectional view as per FIG. 1,
[0022] FIG. 3 A perspective view of a second burner
arrangement,
[0023] FIG. 4 A detail view of area A in FIG. 3,
[0024] FIG. 5 A perspective view of a first cathode,
[0025] FIG. 6 A perspective view of a second cathode,
[0026] FIG. 7 A perspective view of a third cathode and
[0027] FIG. 8 A perspective view of a fourth cathode.
[0028] FIG. 1 and 2 show views of a first burner arrangement. The
burner is a surface burner. A burner plate 1 made of a ceramic
material, for example Al.sub.2O.sub.3, ZrO.sub.2 or similar, has
the form of a cylindrical disk. Burner plate 1 is provided with a
plurality of axially running breakthroughs 2 to conduct a gaseous
fuel, for example. Reference designator 3 denotes flames extending
from a top side 4 of the burner plate 1. A diameter of the
breakthroughs 2 is selected in such a manner that the spread of the
flames 3, in other words the formation of a flame 3 within the
breakthroughs 2, is impossible. A cathode 5 made of a
temperature-resistant metal is contained in a correspondingly
formed recess 6 which opens towards the top side 4. The depth of
the recess 6 is such that the recess can completely hold the
cathode 5 which is designed, for example, in the shape of a bent
wire. In other words, the cathode 5 does not protrude over the top
side 4. The breakthroughs 2 can extend into the recess 6. The
recess 6 can be made either by milling, grinding or similar after
the firing of the ceramic which forms the burner plate 1. But
preferably the recess 6 will already be made before the firing of
the burner plate 1 by appropriate shaping or processing of the
green body.
[0029] Reference designator 7 denotes an anode which protrudes into
the area of the flames 3 in the approximate opposite arrangement to
cathode 5.
[0030] As FIG. 1 particularly shows, the ends 5a of the cathode 5
are led through and out of the burner plate 1 via a bottom side of
burner plate 8.
[0031] FIG. 3 and 4 show a second burner arrangement. In this
connection, a volume burner element 9 made in the shape of a
cylindrical disk is provided above the top side 4 of the burner
plate 1. A slit 11 formed between the top side 4 and a volume
burner bottom side 10 has a width in the range of 1 to 5 mm.
[0032] The volume burner element 9 is usefully made of a porous
material, for example a porous ceramic, a ceramic foam, metal
braiding or similar. The volume burner element 9 has a further
breakthrough 12 through which the anode 7 is led up to the vicinity
of the top side 4 of the burner plate 1.
[0033] The function of the burner arrangements is stated below:
[0034] Gas flows through the breakthroughs 2 in the burner plate 1.
The gas is ignited with a ignition device (not shown here). Because
of this, the flames 3 extend from the top side 4 to the burner
plate 1. Due to the formation of the flames 3, a significant change
in the electrical conductivity is measured between the cathode 5
and the anode 7 via a measuring device (not shown here). This
change shows the existence of the flames 3. If the flames 3 do not
occur, due to a faulty ignition or gust of wind for example, or are
extinguished, this is detected by the lack of increased
conductivity between cathode 5 and anode 7. For example, a safety
shutoff valve installed in a gas feeder line can be automatically
closed.
[0035] To obtain as reliable conductivity measured values as
possible, it has proven useful to maintain the cathode 5 within a
specified temperature range. For this purpose, the cathode 5 is
placed in the recess 6 which opens towards the top side 4 of the
burner plate 1. As particularly shown in FIGS. 1 and 2, the flames
3 extend first from the top side 4 of the burner plate 1. In other
words, the cathode 5 is not located within the flames 3. Apart from
this, the cathode 5 can be surrounded with gas through the
breakthroughs 2 extending into the recess 6 and thus be cooled or
maintained within a specified temperature range. For further
thermal stabilization of the cathode 5, it is useful to lead out
its ends 5a through the bottom side of the burner plate 8. With
this, heat transferred to the cathode 5 in the area of the top side
4 can be guided to a cooler area on the bottom side of the burner
plate 8. The suggested arrangement of cathode 5 makes possible safe
and reliable detection of the existence or non-existence of a flame
3.
[0036] FIG. 5 to 8 show possible embodiments of the cathode 5. In
FIG. 5 to 7 the cathode 5 is made from a bent wire. It has at least
one end 5a each for leading through up to the bottom side of the
burner plate 8. As FIG. 5 to 7 show, the wire can be bent either
meandering-shaped or also like a spiral.
[0037] The cathode 5 shown in FIG. 8 consists of a perforated plate
with a heat dissipating and connection element 13 extending
therefrom.
REFERENCE DESIGNATION LIST
[0038] 1 Burner plate
[0039] 2 Breakthrough
[0040] 3 Flame
[0041] 4 Top side
[0042] 5 Cathode
[0043] 5a End of the cathode
[0044] 6 Recess
[0045] 7 Anode
[0046] 8 Bottom side of burner plate
[0047] 9 Volume burner element
[0048] 10 Bottom side of volume burner element
[0049] 11 Slit
[0050] 12 Further breakthrough
[0051] 13 Heat dissipating and connection element
* * * * *