US20110081621A1 - Metal burner membrane - Google Patents
Metal burner membrane Download PDFInfo
- Publication number
- US20110081621A1 US20110081621A1 US12/967,386 US96738610A US2011081621A1 US 20110081621 A1 US20110081621 A1 US 20110081621A1 US 96738610 A US96738610 A US 96738610A US 2011081621 A1 US2011081621 A1 US 2011081621A1
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- US
- United States
- Prior art keywords
- curvature
- section
- gas burner
- transition region
- membrane
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/12—Radiant burners
- F23D14/14—Radiant burners using screens or perforated plates
- F23D14/145—Radiant burners using screens or perforated plates combustion being stabilised at a screen or a perforated plate
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2203/00—Gaseous fuel burners
- F23D2203/10—Flame diffusing means
- F23D2203/101—Flame diffusing means characterised by surface shape
- F23D2203/1017—Flame diffusing means characterised by surface shape curved
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2212/00—Burner material specifications
- F23D2212/20—Burner material specifications metallic
- F23D2212/201—Fibres
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Gas Burners (AREA)
- Feeding And Controlling Fuel (AREA)
Abstract
The invention relates to a gas burner comprising a metal burner membrane having a base section (201), a closing section (203) and a transition region in between (202). The shape of the membrane is such that the smallest radius of curvature of the transition zone is smaller than the smallest radius of curvature of the base section. Furthermore the burner membrane uninterruptedly flows over from the base section through the transition region into the closing section. The advantages of such a gas burner are amongst others a large dynamic power range, an improved flame front and a low production cost.
Description
- The present application is a divisional application of U.S. application Ser. No. 10/553,405, filed Nov. 10, 2005, which is the National Stage of Application No. PCT/EP2004/050205 filed on Feb. 25, 2004, which is based upon and claims the benefit of priority from European Application No. 03101079.6, filed Apr. 18, 2003, the entire contents of all of which are incorporated herein by reference.
- The present invention relates to a gas burner comprising a metal burner membrane.
- Prior art gas burners with different shapes and different burner membranes have been described e.g. in WO 02/44618 A1 and WO 01/79756 A1.
- The first drawback of these burners is that for a given dimension, they do not allow for a large range in output power: at low power, i.e. if the gasflow is low, there is a risk for flame extinguishment, and at high powers, i.e. if the gasflow is high, there is a risk that the flame blows off. This results in the need of a range of burners that differ only slightly in dimensions (e.g. in their height) adapted to specific power ratings: a second drawback.
- A third drawback of these burners is that different parts have to be punched, formed and welded together which leads to expensive burners.
- The welding seams themselves are weak points in the burner, because they are most susceptible to failure in the heating and cooling cycles that occur during the use of a gas burner. Hence, the weldings reduce the lifetime of the product, which constitutes a fourth drawback.
- It is a general object of the present invention to eliminate the drawbacks of the prior art burners. It is a first object of the present invention to provide a burner with an increased range in output power. It is a second object of the present invention to provide a burner with an increased lifetime. It is a third object of the present invention to provide a burner with a reduced production cost. It is a fourth object of the present invention to provide a burner with an improved flame distribution.
- A gas burner according the present invention comprises a metal burner membrane. Geometrically this burner membrane comprises a base section and a closing section. The base section has a smallest radius of curvature Rbase. What is meant with “smallest radius of curvature” will be explained further on. The base section is connected uninterruptedly to the closing section through a transition region: the transition region burner membrane comprises the same elements as the base and closing section. The transition region has a smallest radius of curvature rtransition being larger than zero and being smaller or equal to Rbase: 0<rtransition≦Rbase. The case in which the base section is a plane, hence Rbase is infinitely large, is not excluded. More preferred is: 0.02×Rbase≦rtransition≦0.7×Rbase. Even more preferred is: 0.02×Rbase≦rtransition≦0.35×Rbase There is no limitation on the smallest radius of curvature of the closing section.
- The notion of “smallest radius of curvature of a section” will now be explained:
- Geometrically, at each point of the burner membrane, many radii of curvature can be defined: each of them is associated with a particular cut according a plane containing the normal line at the point under consideration. The intersection of this plane with the burner membrane results in a trajectory. The radius of curvature is the radius of the circle in the intersecting plane, which osculates to second order the trajectory at the point under consideration. Out of all these possible planes, containing the normal line through the point under consideration, with associated trajectories and radii of curvature, the smallest radius is selected. As each point of a section has a smallest radius, the smallest of all smallest radii of the section can be defined to be the smallest radius of curvature of this section. As the radius of curvature is always a positive number, the smallest radius of curvature that may be found is zero. The same definition applies mutatis mutandis to each of the three parts of the burner membrane: the base section, the transition region and the closing section. For each of them a smallest radius of curvature can thus be found. For example: for a base section having a tubular shape with a rounded polygonal cross section this smallest radius of curvature is equal to the radius of the rounding in the edges. Likewise for a cylinder the smallest radius of curvature is equal to half its diameter.
- As this geometrical construction must be reduced to practice, it should be clear that the invention relates to the embodiment of this geometrical construction, which of course is subject to engineering tolerances. Hence, it should be clear that the invention is not delimited to the abstract geometrical shape as such but to the shape of the actual burner membrane. This shape can be easily measured by means of an appropriate computerised 3-D measuring bench that allows for immediate determination of the geometrical features in general and the radii of curvature in particular.
- The shape of the burner membrane influences the functioning of the burner in the following way: those regions of the burner membrane that have a smaller radius of curvature yield a lower gas speed outside the membrane compared to the regions with a higher radius of curvature. A lower gas speed leads to a lower flame front. So the speed of the gas outside the membrane, and subsequently the flame front, can be advantageously modulated over the surface by changing the radius of curvature.
- This yields, amongst others, the following advantages:
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- Due to the area of reduced gas speed, the flame is less prone to blow-off.
- Due to the different gas speeds over the burner membrane, a large variation in gas flow rate can be accommodated with the same burner, thus eliminating the need to have different types of burners on stock.
- The area with a smaller radius of curvature, due to the slower gas flow, lends itself advantageously for the ignition of the gas.
- According to the present invention the transition from base section to closing section is realised without interruption. With uninterrupted is meant that the membrane forming the different sections (base, transition and closing) are not connected by any means that would lead to a seam of the membrane with a blocked gas flow at the burner surface as a result. I.e. the three sections: base, transition and closing must be gas permeable. The fact that the burner membrane is free of interruption ensures a closed flame front throughout the whole burner membrane. The three sections (base, transition and closing) can be realised uninterruptedly in one of the following ways:
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- by using a fabric of braided or knitted or woven stainless steel fibres. Such fabric can be woven or braided or knitted in such a way that it fulfils the geometrical requirements of the invention;
- by deep drawing or stamping a plate into a shape which fulfils the geometrical requirements of the invention. Small holes must be drilled into the plate in the three sections (base, transition and closing) in order to achieve the desired gas flow;
- by deep drawing or stamping of an already foraminated plate thus eliminating the need for drilling holes into the plate afterwards;
- by deep drawing or stamping a wire mesh where the wires have a suitable thickness and formability
- Combinations of the above methods are possible, e.g.
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- a fabric of braided or knitted or woven stainless steel fibres which is stretched over a deep drawn or stamped plate in which holes are drilled;
- a fabric of braided or knitted or woven stainless steel fibres which is stretched over a deep drawn or stamped foraminated plate;
- a fabric of braided or knitted or woven stainless steel fibres that is supported by a deep drawn or stamped wire mesh. The wire mesh can also be integrated into the stainless steel fibre fabric i.e. it can be interbraided or interknitted or interwoven with the stainless steel fibres.
- It is clear that the above enumeration is non-exhaustive and even different possibilities according the claims of this invention are possible.
- By realising the burner membrane in this way, one or more of the following advantages, amongst others, can be achieved:
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- a reduction in production cost is obtained by elimination of the welding seams and the assembly of the different parts of the prior art burners, by the use of a deep drawn or stamped plate or foraminated plate;
- an improved lifetime of the gas burner is obtained due to the elimination of the welding seams;
- the use of stainless steel fibres on top of the foraminated plate isolates the flame from the plate and results in a lower thermal stress on the foraminated plate and hence an improved lifetime;
- the use of stainless steel fibre results in a further random scattering of the gas flow upon exit of the feed through holes which leads to an improved flame distribution.
- The uninterrupted burner membrane ensures a flame front in every section of the burner and in particular in the transition region. This improves greatly the stability of the flame.
- The invention will now be described into more detail with reference to the accompanying drawings wherein
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FIG. 1 illustrates the basic geometrical principles of the invention in perspective view. -
FIG. 2 illustrates a preferred embodiment of the invention in perspective view -
FIG. 3( a) shows a cut of the preferred embodiment along the line A, A′ ofFIG. 2 along with the geometrical elements. -
FIG. 3( b) shows a cut of the preferred embodiment along the line A, A′ ofFIG. 2 along with the physical features. -
FIG. 4 (a) shows a second preferred embodiment based on a rectangular cross section of the base section. -
FIGS. 4( b) and 4(c) show the section through planes AA′ and BB′ ofFIG. 4( a) respectively. -
FIG. 4( d) shows a top view cross section of the burner ofFIG. 4( a), through the middle of the base section. -
FIG. 5( a) shows a third preferred embodiment in side view. -
FIG. 5( b) shows the third preferred embodiment from above. -
FIG. 5( c) shows an alternate to the third preferred embodiment in side view. -
FIG. 6( a) shows a fourth preferred embodiment in side view. -
FIG. 6( b) shows the fourth preferred embodiment from above. -
FIG. 6( c) shows an alternate to the fourth preferred embodiment in side view. - The basic geometrical features of the invention are illustrated in
FIG. 1 where ashape 100 of a burner membrane is depicted consisting out of abase section 102, atransition section 104 and atop section 106. Take ‘a’ as point under consideration in which ‘a’ has its normal N to the surface. The planes P1, P2 and P3, all containing the normal N, cut the surface of the burner along different trajectories T1, T2 and T3 respectively. The osculating circle C touches T1 in ‘a’. It will be clear that of all planes containing N, the plane P1 determines the trajectory T1 with the smallest radius of curvature R(a) at ‘a’. If now for every point ‘x’ (not indicated onFIG. 1 ) of the transition section this R(x) is determined, the smallest value of all R(x)'s can be chosen. When the procedure is applied to the base section 102 a smallest radius of curvature ‘Rbase’ is obtained. Similarly, a smallest radius of curvature ‘rtransition’ can be found for the transition region. It is essential to the invention that the smallest radius of curvature of the transition region is smaller than or equal to the smallest radius of curvature of the base section. -
FIG. 2 depicts a firstpreferred embodiment 200 in perspective view. Thebase section 201 is frustoconical in shape and reaches its minimum radius of curvature on thecircle 204. Thetransition region 202 is a surface section of a torus and theclosing section 203 is a flat disc. -
FIG. 3 a shows the geometrical elements of the first preferred embodiment ofFIG. 2 according to the line AA′. Only the outer surface of the surface membrane is depicted in order to bring forward the geometrical elements. Thefrustoconical base section 201 has its smallest radius of curvature at the smaller diameter side. The half top angle of thecone 326 was about 30° although 0° (a cylindrical base section) turned out to work just as well (embodiment not shown). Higher top angles—the maximum being 90°, a flat plane—are also not excluded. All points on thecircle 204 share the same minimum radius ofcurvature R base 328. Thesphere 320 with radius Rbase defines the largest ‘smallest radius of curvature’ the transition region may have according to the invention. The transition region is part of the surface of a torus formed by acircle 324 that is rotated around thesymmetry axis 340. Hence, the radius ofcircle 324 determines the radius of the transition region ‘rtransition’ 330. Part of a torus surface between the plane ofcircle 204 and a plane parallel to the latter is taken as the transition region. Let it be clear that the torus can also be constructed by rotating an ellipse or an oval or any other rounded figure around the axis ofsymmetry 340. Also the case, in which the torus is degenerate i.e. when there is no hole in the middle, is not excluded. This is e.g. the case inFIG. 3 a. Theclosing section 203 is a flat disc in this embodiment. In another preferred embodiment of this invention (no figure provided) the closing section is a small inverted sphere cap thus entailing a depression at the centre of the burner membrane. - It will be clear from this embodiment that the crossover from base section to transition region need not be smooth (with ‘smooth’ is meant continuous first order derivatives) but must be uninterrupted (zero order continuity).
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FIG. 3 b depicts the physical features of the first preferred embodiment along the cut according plane AA′ indicated in FIG. 2. 201′ indicates the stamped foraminated metal plate made out of a single piece of metal plate. The foraminated metal plate is provided with a number of holes. As the hole size is relatively large (1 mm for this embodiment), the change in hole size at the transition region due to the deformation of the plate is not relevant to the flow speed of the gas. In order to spread the gas a piece of knittedmetal fibre fabric 305 is tensioned over the base section, the transition section and the closing section. In this preferred embodiment, the fabric was attached to the foraminated plate by means of spot welding although other means of fastening are equally well possible for example—without being exhaustive—by sewing or by stapling. In another preferred embodiment (no figure provided), the fabric was kept on the foraminated plate by means of a clamping ring that was spot welded to the plate. - Knitted metal fibre fabric allows for a high elongation thus leading to a continuous transition from the base section to the closing section. The
arrows transition region 202 is represented with ashorter vector 308, while the gas velocity at thebase section 201 and theclosing section 203 is higher which is represented by alonger vector 309 resp. 307. Also thelower flame front 310—where the gas ignites—and theouter flame front 313—where the top of the flame is—is indicated for each of the sections. - With this preferred embodiment, it was possible to achieve a maximum heating power of 40 kW/dm2. A minimum heating power of 1 kW/dm2 was necessary in order to get a stable flame. This yields an overall dynamic range of 1:40.
- In
FIG. 4 a preferred embodiment is illustrated that is more suited for replacement of a rectangular type burner. Here the cross-section of the base section is essentially rectangular of which the edges are rounded.FIG. 4 b is a cross-section along plane AA′ ofFIG. 4 a: thebase section 401 smoothly goes over into thetransition region 402 which approximates the upper half of an ellipse with a minor half axis indicated by 406 and a major half axis indicated by 405. 407 indicates the osculating circle associated with the smallest radius of curvature of the transition region.FIG. 4 c shows a cut along the line BB′.FIG. 4 c shows an essentially identical shape as the AA′ cut, but here the half ellipse has been cut in two, and the two quarter pieces have been displaced the appropriate distance.FIG. 4 d shows the closing view of a horizontal cut. The rounded corners have essentially merged into a semicircle with a radius equal to the half major axis of the ellipse as described inFIG. 4 b. - Note that in this embodiment, the closing section has vanished into a
single line 408. - In a third preferred embodiment illustrated in
FIGS. 5 a and 5 b theforaminated plate 201′ ofFIG. 3 b was replaced by a stainlesssteel wire mesh 520. The diameter of the wires was 0.48 mm, with a square 24/24 mesh size (24 wires per inch) in a 2/2 twilled weave. The minimum radius ofcurvature 506 in thetransition region 502 was equal to 4 mm although a radius from 2 to 8 mm works equally well. The value of the minimum radius ofcurvature 508 of thebase section 501 was 25 mm and is preferably in the range of 30 to 45 mm. The closing section is aflat disc 504. A knittedmetal fibre fabric 512 was spot welded to the wire mesh. - An alternative to the third embodiment is depicted in
FIG. 5( c). Like parts of the burner membrane according the third embodiment are identified with primed numbers. Thetransition region 502′ is in the form of a circular ridge. The top of the ridge has a radius ofcurvature 506′, which turns out to be the smallest radius of curvature of the transition region. - In a fourth preferred embodiment illustrated in
FIGS. 6 a and 6 b, again a stainlesssteel wire mesh 610 was used. Thebase section 601 has a very large minimum radius of curvature, thetransition region 602 has a minimum radius of curvature indicated by 606, while the closing section vanishes to asingle line 604. The minimum radius of curvature of thetransition region 606 is 9 mm although values from 3 mm upward are also possible. - An alternative to the fourth embodiment is depicted in
FIG. 6( c). Again like parts of the burner membrane according the fourth embodiment are identified with primed numbers. Thetransition region 602′ is in the form of a ridge extending substantially the length of the longitudinal burner membrane. The top of the ridge has a radius ofcurvature 606′, which turns out to be the smallest radius of curvature of the transition region. Again the closing section vanishes into aline 604′.
Claims (11)
1. A gas burner, comprising:
a metal burner membrane comprising a base section that is a plane and a closing section,
wherein the metal burner membrane is uninterrupted and comprises a transition region for connecting the base section to the closing section, wherein the transition region has a smallest radius of curvature rtransition being larger than zero.
2. A gas burner according to claim 1 , wherein the smallest radius of curvature rtransition of the transition region is larger than 3 mm.
3. A gas burner according to claim 2 , wherein the smallest radius of curvature rtransition of the transition region is 9 mm.
4. A gas burner according to claim 1 , wherein the closing section vanishes into a line.
5. A gas burner according to claim 1 , wherein the metal burner membrane comprises a fabric comprising stainless steel fibers.
6. A gas burner according to claim 5 , wherein the stainless steel fibers are arranged essentially parallel into bundles.
7. A gas burner according to claim 6 , wherein the bundles are knitted, braided, or woven.
8. A gas burner according to claim 1 , wherein the metal burner membrane comprises a foraminated plate or sheet.
9. A gas burner according to claim 8 , wherein stainless steel fibers are disposed outside of the transition region, the base section and the closing section.
10. A gas burner according to claim 1 , wherein the metal burner membrane comprises a fabric of stainless steel fibers that is supported by a deep drawn or stamped wire mesh, the stainless steel fibers being braided, knitted, or woven.
11. A gas burner according to claim 10 , wherein the wire mesh is integrated into the fabric of stainless steel fibers.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US12/967,386 US20110081621A1 (en) | 2003-04-18 | 2010-12-14 | Metal burner membrane |
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
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EP03101079 | 2003-04-18 | ||
EP03101079.6 | 2003-04-18 | ||
PCT/EP2004/050205 WO2004092647A1 (en) | 2003-04-18 | 2004-02-25 | A metal burner membrane |
US10/553,405 US20060251998A1 (en) | 2003-04-18 | 2004-02-25 | Metal burner membrane |
US12/967,386 US20110081621A1 (en) | 2003-04-18 | 2010-12-14 | Metal burner membrane |
Related Parent Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/553,405 Division US20060251998A1 (en) | 2003-04-18 | 2004-02-25 | Metal burner membrane |
PCT/EP2004/050205 Division WO2004092647A1 (en) | 2003-04-18 | 2004-02-25 | A metal burner membrane |
Publications (1)
Publication Number | Publication Date |
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US20110081621A1 true US20110081621A1 (en) | 2011-04-07 |
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ID=33185953
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
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US10/553,405 Abandoned US20060251998A1 (en) | 2003-04-18 | 2004-02-25 | Metal burner membrane |
US12/967,386 Abandoned US20110081621A1 (en) | 2003-04-18 | 2010-12-14 | Metal burner membrane |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
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US10/553,405 Abandoned US20060251998A1 (en) | 2003-04-18 | 2004-02-25 | Metal burner membrane |
Country Status (5)
Country | Link |
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US (2) | US20060251998A1 (en) |
EP (1) | EP1616128B1 (en) |
KR (2) | KR20110104080A (en) |
CN (2) | CN100557310C (en) |
WO (1) | WO2004092647A1 (en) |
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- 2004-02-25 KR KR1020057019833A patent/KR20050122273A/en active Search and Examination
- 2004-02-25 EP EP04714333.4A patent/EP1616128B1/en not_active Expired - Lifetime
- 2004-02-25 CN CNB2004800104429A patent/CN100557310C/en not_active Expired - Lifetime
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20130312700A1 (en) * | 2012-05-23 | 2013-11-28 | Paloma Co., Ltd. | Rich-lean burner |
US9086010B2 (en) * | 2012-05-23 | 2015-07-21 | Paloma Co., Ltd. | Rich-lean burner |
EP2789911A1 (en) * | 2013-04-09 | 2014-10-15 | Bekaert Combustion Technology B.V. | Gas premix burner |
US20150192291A1 (en) * | 2014-01-06 | 2015-07-09 | Rheem Manufacturing Company | Multi-Cone Fuel Burner Apparatus For Multi-Tube Heat Exchanger |
Also Published As
Publication number | Publication date |
---|---|
CN101545634B (en) | 2012-04-04 |
US20060251998A1 (en) | 2006-11-09 |
CN101545634A (en) | 2009-09-30 |
CN100557310C (en) | 2009-11-04 |
KR20110104080A (en) | 2011-09-21 |
EP1616128A1 (en) | 2006-01-18 |
EP1616128B1 (en) | 2016-05-04 |
CN1777775A (en) | 2006-05-24 |
KR20050122273A (en) | 2005-12-28 |
WO2004092647A1 (en) | 2004-10-28 |
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