JPH07504266A - porous metal fiber plate - Google Patents

Abstract

The invention relates to a porous metal fiber plate (1), in which a regular pattern of holes (2) has been made which occupy an overall free passage area of 5 % to 35 % of the total surface area of the plate, while each hole (2) has a surface area of between 0.03 mm<2> and 10 mm<2>. The plate is suitable for use as a membrane in a gas burner device. The invention covers also a gas burner device in which such a porous metal fiber membrane is mounted.

Description

[Detailed description of the invention] porous metal fiber plate The present invention relates to porous metal fiber plates. Such a plate The fibers are sintered together in the used as a thing.

Additionally, these films can be used as thin films for radiant surface combustion burners for gas mixtures. The use of fiber webs can be achieved by using fibers containing chromium and aluminium. are used in Europe to create resistance to high temperatures. It is known from State Patent No. 157,432.

These non-woven steel fiber webs, fiber mats or sintered fiber plates The porosity of the plate is not always completely homogeneous, so it should be uniform over the entire surface of the plate. Lateral gas flow cannot always be guaranteed. Many uses, e.g. play Combined with a small pressure drop across the thickness, a controlled, uniform flow is achieved in place. Excellent for gas permeable support plates and burner membranes for desired fluidized bed processing. This turned out to be a drawback.

Avoiding this drawback of known gas-permeable metal fiber plates and It is an object of the present invention to provide a plate with controlled and uniform gas flow. . According to the invention, this purpose is achieved by adding up to 5 to 35% of the total surface area of the plate. A regular pattern of transverse holes or passages is made therein which occupies the total free passage area of porous gold, with each hole having a surface area between 0.03 and 10 mm. This is accomplished by providing a genus fiber plate.

Gas flow is therefore primarily passed through these holes. This feature is, among other things, preferred in view of achieving a small pressure drop across the rate.

Use insofar as the plate requires being utilized at very high temperatures. The metal fibers used must withstand these temperatures. equivalent fiber The diameter may range between about 8-150 μm. The equivalent fiber diameter is here , the average cross-sectional surface of an actual fiber that is not perfectly circular or even totally thermally circular. diameter of a hypothetical perfectly cylindrical fiber with a cross-sectional surface corresponding to means. The thickness of the plate is preferably between 0.8 and 4 mm, and The rate is sufficiently stiff to resist the selected pressure drop at the desired porosity. And strong. For example, plate thicknesses of 1.2 and 3 mm are suitable. Therefore, porous The sexual plate may have a separate support near its bottom surface or its top surface, e.g. steel plate) is not required.

In this way, the bottom and top surfaces remain freely accessible.

Housing with supply means for the gas to be combusted, distribution section for the gas flow including a porous metal fiber plate as a burner thin film, Allows for controllable and uniform gas flow to the membrane exit surface, resulting in a Enables a uniform combustion process over the burner surface, and gases across a thin film It is another object of the invention to provide a gas burner device with a low pressure drop in the flow. It is.

Furthermore, it is a further object of the present invention to provide a durable burner membrane. here , some surface areas are more susceptible than others due to overloading or overheating and poor porosity. Uniformity (resulting in uncontrollable differential gas incandescent passage and combustion areas) Therefore, it does not deteriorate prematurely.

Another important object of the invention is that the burner thin film can be used over a very wide power range. can be used and is therefore suitable for both surface radiation and blue flame modes. Concerning the design of porous metal fiber plates.

A further object of the invention is to provide significantly lower carbon monoxide and NOx emissions and higher energy – deals with the design of the burner membrane plate that provides the discharge volume.

Still another object of the invention is to provide less restrictive prefiltration of the incoming gas stream. Regarding the design of gas burners.

There is less risk of resonances occurring in the gas flow, thus eliminating whistling effects that may occur during operation. The provision of a gas combustion device for avoiding It is important.

Further details are provided below based on some implementations. specific or part Additional solutions according to the invention for problems or purposes and features of those solutions , as well as the benefits they entail will also be made clear.

FIG. 1 is a schematic representation of a porous plate with circular holes according to the invention.

Figure 2 shows the supply means for the gas and the transport and flow mechanism for the gas through the plate. 1 shows one possible way of assembling the plate of the invention in a stepped housing.

FIG. 3 schematically shows a pipe-shaped device through which the gas flow passes.

Figures 4-7 show some alternatives for transverse passages to be arranged in a porous plate. related to a top view of a typical pattern.

Figure 8 shows the invention in which the sound deadening layer is clamped between the burner membrane and the dispersion part. 1 shows a cross-section of the gas burner device according to FIG.

Figure 9 shows a gas chamber containing a number of sound-deadening layers (along with a generally empty interior space). 2 shows a cross section of the burner device.

The porous metal fiber plates 1 according to FIG. 1 are arranged at regular intervals p (pitch ), including holes 2 located at . These holes are preferably cylindrical in shape shaped, and especially circular cylindrical. Preferably each hole 2 are the same and are between 0.03 and 3.2, more preferably 0. It is between 4 and 1.5*2, especially between 0.5 and 0.8w2. shown below As would be expected, these dimensions depend inter alia on the thickness of the plate 1, its porosity. and should be chosen depending on the intended use. For example, hole 2 has a circular cross section When the diameter of each circle is 0.8 mm, the diameter of each circle will be 0.8 mm due to the surface area of about 0.5 square meters.

Hole 2 is preferably punched, as the punching operation ensures a smooth cylinder wall. It is created using the following operations. If desired, the holes can also be triangular, square, rectangular or other shapes Can be punched out. Also, the holes can be made with a laser beam. Therefore, in principle , very small holes with a diameter of at least 0.2 mm are possible for thin plates. It is Noh.

4-7 illustrate other preferred channel shapes, namely slots and plate surfaces of various shapes. exemplify their regular distribution over . Adjacent rectangular slot 9 appropriate Two examples of regular patterns are shown in FIG. 4 (right side, corresponding left side). Round The passages 2 and rectangular slots 9 are arranged alternately over the entire surface as shown in FIG. Can be repeated.

Similarly, an oblong or oval slot 11 can be replaced by a circular hole 2 as shown in FIG. can be repeated alternately. The pattern of cross-shaped slots 10 is also shown in FIG. It is possible as illustrated in . A large number of regular passages with various shapes This distribution minimizes, among other things, the whistling effect in the gas flow (which will be further explained). This can be considered from the viewpoint of doing or avoiding.

Each of the slots 9.10.11 preferably has a surface area between 1 and 10. ing. A rectangular or substantially rectangular slot may have a slot between 0.3 and 2 mm. It will have a cut width rwJ and a length rLJ between 3 and 20 cm. Preferably 0 ．． The relationships 5■≦W≦1■ and 5 cabinets≦L≦10 cabinets will apply. In any However, for example in a plate with rectangular slots 9 according to FIG. 4 or 5, This total free passage area accounts for 20-30% of the total surface area of the plate.

The pitch p between adjacent holes 2 is such that their total surface area is the total surface area of the plate. It is selected to account for 5-25%, and preferably 8-16%. 10%, 1 Values of 2% and 15% are suitable. To ensure uniform flow across the surface, Successive holes are preferably adjacent regular holes where each hole 2 occupies a corner of the triangle. Arranged in a triangular pattern.

The porosity of the plate (between holes 2) is always between 60 and 95%, preferably It is between 78 and 88%. The plate surface can be flat (embossed) may have relief (e.g. curved or corrugated). can be done.

Metal foils that can be used to produce porous plates and in the production of the plates themselves Fibers, and especially metal fibers that are resistant to very high temperatures, It is described in European Patent Application No. 390.255. Generally, stainless steel Less steel fiber is suitable. For high temperature use, e.g. on gas burners. For this purpose, steel fibers containing chromium and aluminum are used, preferably In this case, a rope fiber containing a small amount of yttrium is used.

As shown in FIG. 2, the porous plate 1 according to the invention has a supply means for gas. 4 can be assembled in a standard manner into the housing 3. this device when a combustible gas mixture (e.g. natural gas) is intended to function as a gas burner. gas/air) may be supplied. Furthermore, the device so formed is A dispersion element 5 for the flow of gas can be included. Standardly speaking, it means that e.g. such that a uniform flow of gas with suitable pressure reaches the inlet side of the porous plate 1. It would be a plate with suitable holes or passages placed therein. in the distribution plate 5 The free passage surface area can be between 2 and 10%. cylindrical burner (FIG. 3), the distribution plate 5 also serves as a support part for the end plate 8. useful as. The dispersive component 5 could possibly be corrugated and also To counteract possible resonances of sound in the gas stream, or e.g. Backfire on the gas inlet side of plate 1 as a result of damage (cracks) during If so, it can act as a flame arrester or barrier. If desired, hole 2 can be Conical inlet 6 and cylindrical outlet lower or vice versa (upside down plate) ), that is, it can have a cylindrical inlet and a conical outlet.

The dispersion part 5 is also preferably arranged in an end plate in a cylindrical device according to FIG. It is provided for gas supply together with port 8. Thin film plate 1 with hole pattern 2 Because of its flexibility, relatively small diameter cylinders can be bent from flat plates. It can be made.

provided in the burner housing and the space to be heated (e.g. boiler) Depending on the type of structure, the resonance may be relatively high, for example over 1000 kW/m2. I found out that this can happen with very low output. Also, gas is sucked through the thin film ( the gas mixture supply, along with the fact whether it is drawn in) or pumped out. Excess air inside seems to have an effect on the tendency to resonate. Finally, used during thin film The hole pattern itself may also play a role in the resonance phenomenon.

The resonance phenomenon is caused by the relatively cold lower side (inlet side) and the very hot upper side (outlet side) of the burner membrane. This is probably related to the high pressure gradient of the gas mixture between the mouth (or combustion surface).

By changing the flow velocity variables e.g. excess air and gas mixture flow velocity, the oscillatory phenomenon can be It probably occurs between the flame front (ie the height of the flame base) and the gas mixture entering the hole. Therefore , the tongue of flame can dance up and down on the top of the burner surface, or inside the hole ( or even below the hole) and above the hole (above the burning surface). It can even vibrate with the flame base. This is true for frequencies in the 1000-1500Hz range. May be accompanied by a buzzing sound. This drawback is also due to the fact that the burner blows out gas can be encountered when changing from a suction gas system to a suction gas system.

As mentioned above, it is important to eliminate this drawback and to reduce the occurrence of buzzing noises. It is an object of the present invention to reduce the size. However, the measures taken are porous None of the other advantages of the burner membrane concept should be diminished. Especially this This means that either a severe increase in the total pressure drop across the burner or ) should not lead to instability.

The solution according to the invention consists of the following parts arranged in sequence one after the other along the flow: Supply means for the gas to be combusted, dispersion parts, at least through which the gas can pass one sound-deadening layer and a regular set of holes that together make up 5-35% of the surface area of the plate. A pattern is provided, each hole having a surface area of 0.03 to 10111I2. , a gas chamber containing a housing containing a porous plate as a burner membrane. and providing a manager device.

Details will be explained based on many implementations.

For this purpose, Figures 8 and 9 are cited. Embodiments are to be understood as examples only. It is.

The gas burner device according to Figure 8 consists of the following parts arranged in succession along the flow: a supply duct 15 for the product, i.e. the gas mixture, and a vented end of the supply duct 15; having a dispersion part 5 in the form of a perforated metal plate placed against 22; The housing 16 includes one housing 16. The housing 16 is attached to the supply duct at a weld 17. I'm being kicked. The distribution plates 5 are, for example, 0.40 mm thick and each 0.4 mm thick. A hole 18 is provided with a diameter of . The hole or passage 18 has a triangular shape of 1.25+m. Corner points of a pattern of adjacent equilateral triangles with one side of the shape (i.e. the pitch between holes) can be placed in This reduces the free passage surface area of plate 5 by approximately 10%. means. Depending on the situation, this free surface area can likewise be between 5 and 20%. did it. Below 5%, the pressure drop becomes too high at high gas flow rates and exceeds 20%. Beyond this, the dispersion effect for the gas mixture becomes insufficient at low flow rates.

For the outlet side of the dispersion part 5, for example a wire diameter of 0.125 m and a 48 mesh A welded wire mesh 13 of stainless steel wire with gas permeability of There is. Depending on the situation, the permeability can be chosen between 30 and 60 meshes.

Also, two or more nets 13 (preferably different permeable nets) can be stacked on top of each other. Ru.

Downstream from the welded wire network (or wire networks) 13 serving as a sound deadening layer, There is a porous thin film plate 1 provided with a regular pattern of holes 12 . This porosity The plate again preferably has fibers that are heat resistant, i.e. sintered metal that has resistance to temperature and resistance to thermal shock It is a fiber plate.

Therefore, the fiber preferably has a suitable ROM and aluminum content. Steel fibers, ie iron-chromium alloy fibers as already mentioned, for example.

For example, plate 1 is 2mo thick and has a porosity of 80.5% between the holes. . In Example 2 below, the fiber diameter is 22 μm and the cylinder - The diameter of the punched holes is 0.8 m, and at the same time the distance between the centers of the holes (i.e. the pitch ) was 1.5 m. The plate 1 is attached to the housing 16 between the two It is firmly tightened together with the ceramic mat 14 inserted into the holder.

For situations in which the gas mixture is inhaled (suctioned) and/or should be heated Burners specially shaped for specific configuration parameters related to the combustion space In order to minimize resonances associated with a particular gas flow profile in the As shown, there is a gap 23 or a gap between the sound deadening layer 13 and the dispersion component 5 and/or the thin film 1 may be considered to comprise 24. In this way, various embodiments of The position is made like this. For example, the device may include one in surface contact with the dispersion component 5. A sound deadening layer 13 may be included. In other embodiments, layer 13 comprises component 5 and porous plastic. It can be in surface contact with both rate 1.

Another possibility is to have a porous material inserted between the two wire networks 25 and 26. By making the sound deadening layer 13 as a laminate made of two wire networks 25 and 26 be. If desired, the porosity, and therefore also the pressure drop across this laminate, can be under the influence of the gas pressure of the incoming mixture or by external operating means (not shown). ) may be changed.

For example, the porous material 27 can be a resilient mass of fibers, such as steel wool. Ru. This lateral compression of the laminate as well as a more intense dispersion effect in the mixture The individual relaxation of can reduce the pressure drop across the membrane 1 at high flow rates and therefore resonant again. risks become less significant.

According to another embodiment, the sound deadening layer 13 is made entirely or partially of fibers. It can consist of a sexual mass 27.

If desired, this mass can fill the entire gap between plate 1 and part 5.

Preferably mineral fibers should be used (e.g. rock wool or is steel wool).

Finally, the porous plate 1 also includes a laminate of wire networks sintered together. obtain. Woven or knitted wire networks of heat-resistant wire are used for this purpose. can be done.

A suitable laminate structure is described in U.S. Pat. No. 3,780,872. Ru. Generally, these laminates are made from sintered fiber webs It will be harder. Therefore, they are preferably placed in a flat burner . Of course, hole patterns can also be punched through these laminates as described above. It will be done.

When the gas burner device is intended only for operation at relatively low power, or when the tendency to resonate itself does not need to be avoided, shavings or cuts sintered porous plastics made of fibers or wire networks as described above. Rates may also be used as is. In this case, the sound deadening layer 2 is not required; The embodiments described in Belky Patent Application No. 9.200.209 or Similar embodiments are applicable thereto. Ceramic instead of iron chromium alloy fiber x fibers or wires may also be used.

Example 1 Flat sintered porous manufactured according to the invention and having the characteristics given below metal fiber plates can be used as membranes for gas burner devices. Ru. The features and advantages of the present concept over conventionally provided burner membranes are as follows: explained.

The steel fibers to be used are resistant to high temperatures and for this purpose For example, chromium 15-22% by weight, aluminum 4-5.2% by weight, 0.05-0.4% by weight of thorium, 0.2-0.4% by weight of silicon and up to 0 carbon ．． Contains 03% by weight. These have a diameter of 8-35 μm, e.g. about 22 μm. . Fibers can be used, for example, as known from US Pat. No. 3,379,000, and and as mentioned in U.S. Pat. No. 4,094,673. The vines are obtained by the ``undled drawing'' technique. These are U.S. Patent Nos. 3.469,297 or 3,127.668 method, or a method similar to that known from the above-mentioned specification Processed into a web. The webs are then compressed and sintered. and integrated into a porous plate 1 with a porosity between 78 and 88%. 80. Porosities of 5%, 83% and 85.5% are very common.

In addition, thicker metal fibers can be used as heat-resistant fibers in porous plates. for example with an equivalent diameter between 35 and 150 μm and a desired heat-resistant alloy (e.g. iron). A fiber consisting of wire-shaped shavings or cuttings from a plate of chromium alloy) can be used. These fibers look more like waste wool; for example, as disclosed in U.S. Pat. No. 4,930,199. can be manufactured according to the process.

This porous plate 1 is now placed in a mold and fitted with a suitable punching device. using a cutting machine with a punching bin), it can be completely delimited, e.g. with a diameter of 0 ．． It is provided with a regular pattern of 8 m circular cylindrical passages or holes 2. each A pitch of two holes between a pair of adjacent holes yields a free surface area of approximately 15%. . Compared to plates without holes, this design increases flexibility and therefore At the same time it facilitates the process of forming into cylinders, for example. Also, the hole is Cracks that can form in the thin film plate 1 as a result of fluctuating thermal stresses during operation form a barrier to the spread or propagation of If desired, the hole pattern can be e.g. Wafful pattern (waf) as described in European Patent No. 390,255 fle pattern).

Whenever holes are to be punched into a solid steel plate, the The thickness must always be less than the diameter of the hole. But surprisingly, This is not necessary for punching holes in porous plates according to the invention. I found out that something is wrong. Thus, the plate for the diameter or size of the hole or passage For the thickness ratio, there is a wide range of options.

However, when the gas mixture to be combusted passes through the porous plate 1, the invention The great advantages of the concept emerge. In fact, the gas mixture now flows primarily through hole 2.

Therefore, at a particular flow rate, the pressure drop across the membrane 1 is significantly lower or even higher flow rates (than in the case of As larger heat output or power output can be achieved at a certain pressure drop value .

Factors such as excess air in the gas mixture, e.g. for stoichiometric gas combustion mixtures Depending on the power range is 150-900 kW/m for radiant surface combustion can be chosen between 2 and emissions up to 4000 kW/m2 or The output can be increased up to the output range of a blue flame surface burner.

The porosity of plate 1 allows a small portion of the gas to always pass through the holes between holes 2 to the hot outlet. This results in the fact that it penetrates to the surface. As explained below, this is a widespread This greatly promotes uniform and stable combustion over a wide load or power range. especially, At higher flow rates, the portion of gas passing between the holes through the plate increases proportionally. Ru. It is precisely at these high currents that it is necessary to prevent the tendency to blow out blue flame at the height of the hole. and therefore, if the percentage of excess air is the same in the gas mixture If it remains one, then at higher power. Surface of plate between holes 2 The combustion of gas at , as it were, maintains a stable (blue) flame front over the entire plate surface. , and because it is blown away from the plate surface, this front (i.e., the blue flame inside it) (tongue-shaped part). The tongue-like flame above each hole is, so to speak, fixed to the plate surface. remain with their defined bases, i.e. roots.

The predominantly horizontal orientation of the fibers within the porous plate also enhances the insulating effect of the thin film. Facilitate. In fact, heat conduction mainly occurs on the outer surface (radiation side) of the plate. , and much less in the depth direction (thickness direction) of the plate. Change On the gas inlet side there is a continuous supply of cold gas in direct contact with the fiber layer. It has a uniform cooling effect.

On the other hand, this uniform heat distribution at the height of the plate surface is Uniform combustion of the gas layer and stable combustion over a wide load or power range on the outlet side of the Promote the condition. For example, on the gas inlet side it is attached to a supporting steel plate. and in which the porous layer together with the support plate has the same pattern of holes. In the porous thin film layer 1 of the filter, this insulating effect is generally smaller and can be achieved. The output will be lower. On the other hand, other different embodiments, namely many small holes a regular pattern of holes (e.g. 0.3 mm hole diameter and 1.25 nm adjacent hole diameters) attached to a gas distribution plate support with a pitch (i.e., center-to-center distance) In porous membranes without holes, the gas flow that can be achieved for a given pressure drop is The amount will be more limited than in plates according to the invention. Furthermore , with this arrangement a high power output per unit of burner surface area cannot be achieved.

Another advantage over known perforated plate membranes is that gases primarily passage (hole) 2 and through a small hole in plate 1 to a very limited extent. The need for pre-filtration of the supplied gas is much smaller (need concerning the fact that Further, the thin film plate according to the present invention has holes. or should be cleaned using backflow than is the case with porous plates lacking passages. The frequency is much lower.

In order to prevent backfire toward the gas inlet side in any burner state, The plate thickness, its porosity and the size of the passages or holes are, of course, all proportionate to each other. I have to do it.

In the combustion test, the known FECRALL with a diameter of 22 μm was tested. OY) Regarding the sintered fiber plate 1 made of fibers: Observation acknowledged. The plate is 2rm thick and has a porosity of 80.5%. A gas combustion device of the type illustrated in FIG. 2 was then constructed. hole pattern was punched out into a thin film 1 as shown in FIG. That is, the diameter of the cylindrical hole is 0.8, and the pitch p”2B in a regular grid of adjacent equilateral triangles. It was a regular geometric pattern of holes. Dispersion plate 5 (0.4m thickness ) is 5 ■ away from plate 1 and has a 0.4 m diameter hole and 1,5 intestines. It had a pitch. This resulted in a free passage surface area of 6.5%. luck During the transfer, there was a resonance or buzzing sound.

The pressure drop in the gas mixture at the plate (mbar) is determined by the resulting power (k W/m2) - increases somewhat more rapidly than sequentially. 0.05 mbar A power of 150 kW/m2 was observed at a pressure drop of 3 mbar. A power output of 3500 kW/m2 was achieved at a pressure drop of . gas mixture is , consisting of 8.1% natural gas and 91.9% air. 10k Wh/ Natural gas with a relatively low calorific value of N m3 is used and an excess of 30% Chi was used.

The radiant surface burner condition was observed up to about 800kW/m2. higher output At , combustion changed to blue flame mode. The temperature of the thin film surface (gas outlet side) is approximately 700 kW/m2 to about 850°C, and when moving towards higher output (stomach flame mode) gradually decreased to about 600°C. The thin film temperature on the gas inlet side is 1 remains below 50°C and decreases to below 100°C in gastritis mode. I got it. Measured No emissions (ppm) at full power up to 2000kW/m2 gradually increased over the range. However, it is only at 700kW/m2. approximately IQppm, and for a power output of more than 2000 kW/m2, it It stabilized at about 15-20 ppm. In fact, the measured NO value is based on the amount of NO in the combustion gas. These data have been reduced to their values at 0%02. these very small The small NO value is set at the top of the hole so that the temperature in the center of the tongue remains relatively low. This is probably explained by the fact that the tongue of the tongue remains small. -acid The carbon content was nearly zero over the entire power range.

Therefore, in conclusion, for the burner use in the present invention, a very wide power range and therefore both surface radiation and blue flame modes. It has been found that a porous plate concept suitable for this purpose can be used for the first time. Canada Additionally, this concept provides significantly lower carbon monoxide and NO emissions, which Provides high energy release.

Example 2 In the embodiment of FIG. 8, the porous plate 1 has a wire network 13 of 48 meshes. in contact with the surface. The gas mixture of natural gas and air is passed through a 2-inch thick porous plate. between the dispersive part 5 (both described above) with a free passage surface area of 1 and 10%. This wire network 13, tightly sandwiched together, is placed in a dense passed through the conjugate.

The square burner surface had dimensions of 150m x 150m. various percentages of excess Surplus air is used (1,1 to 1,3) and the flow rate is such that the output is 5'00 to 500 It has been increased to be deployed in the range of 0kW/m2.

In the table below, the resonance results are given in column [1+2+31. For comparison For this purpose, the combustion test was performed on an embodiment with only a connection of plate 1 and dispersion part 5, namely column [ 1+31.

Embodiments without wire mesh 13 and plate 5, i.e. column [1] repeated throughout the table. The minus sign in the table indicates the buzzing sound during combustion. Says the desired absence, while a plus sign indicates the presence of a noisy buzzing sound. . Furthermore, the buzzing sound is caused by the flame base in hole 12 as indicated by arrow 21. 20 vibrations are shown.

We have less excess air (1.1) than more excess air (1.2 or 1. It can be inferred from the table that 3) provides resonance more easily than does 3). In addition, The favorable effect of the network 13 is that higher output loads (over 1000 kW/m2) It seems to appear especially in

&,,, 1211 Yang PCTβε93100010 Continuation of front page (81) Designated countries EP (AT, BE, CH, DE.

DK, ES, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE ), AU, BR, CA, JP, KR, US (72) Inventor: Verplanke, Willie, Belgium, 8500 Cortoli 95 (72) Inventor: Lefebel, Ignace Belgium, 8540 Sollig, Pradies Strat 220 (72) Inventor Rosfeld, Rony Belgium, 8790 Wallegern, Ku Iberstrad 41

Claims (1)

[Claims] 1. In a porous metal fiber plate (1), the regularity of holes or passages (2) A pattern is made in it, with holes or passages occupying 5 to 3 of the total surface area of the plate. 5% of the total free passage area and each hole (2) has a surface area between 0.03 and 10 mm2. A plate characterized by having an area. Plate (1) according to claim 1, having a thickness between 2.0.8 and 4 mm. 3. The holes (2) each have a circular cylindrical shape with a surface area between 0.03 and 3 mm2. The plate according to claim 1, having: 4. The passages are slots (9-11) each having a surface area between 1 and 10 mm2. The plate according to claim 1. 5. Claim 1, wherein both the slot (9, 11) and the circular opening (2) are present. The plate shown. 6. Plate according to claim 1, characterized in that the porosity between the successive channels is between 60 and 95%. . 7. A plate according to claim 6 having a porosity between 7.78 and 88%. 8. The metal fiber is resistant to high temperatures and has a thickness of between 8 and 150 μm. 2. A plate according to claim 1, having a diameter of 1. 9. A claim in which the metal fiber is a steel fiber containing aluminum and chromium. 8. The plate described in 8. 10. 4. A plate according to claim 3, wherein the holes have a surface area of between 0.5 and 0.8 mm2. 11. 4. A plate according to claim 3, wherein the free passage surface area is between 8 and 16%. 12. A series of holes (2) are arranged in an equilateral triangular pattern, each hole (2) 12. A plate as claimed in claim 11, including shaped vertices. 13. The slot has a width "w" between 0.4 and 2 mm and a length "w" between 3 and 20 mm. 5. A plate as claimed in claim 4, which is heterogeneously rectangular with an "L". 14. The slot has a width of 0.5 mm≦w≦1 mm and a length of 5 mm≦L≦10 mm. 14. The plate according to claim 13, comprising: 15. Claim 1: The total free passage area accounts for 20-30% of the total surface area of the plate. 3 or 14. 16. Method of using the plate (1) according to claim 1 as a thin film for gas combustion. . 17. The passages (2) each have a circular cylindrical shape with a surface area between 0.03 and 3 mm2. 17. A method of using a plate (1) according to claim 16, having a shape. 18. Claim in which the passages (2) are slots each having a surface area between 1 and 10 mm. 16. The method of using the plate (1) according to 16. 19. a housing (3) with supply means (4) for the gas to be combusted; with a distributed part (5) for the The burner includes a porous plate (1) as a thin burner membrane, the holes covering the total surface of the plate. occupies a total free passage area of 5 to 35% of the area, and each hole or passage has a diameter of 0.03 to 10 m Gas burner devices with a surface area between m2. 20. The next part arranged in sequence along the flow, i.e. for the gas to be combusted. Feeding means (15), dispersion element (5), at least one sound-absorbing layer permeable to gas (13), and as a burner membrane provided with a regular pattern of holes (12). a housing containing a porous plate (1), the holes totaling the surface of the plate; 5 to 35% of the area, and each hole or passage has a surface area of between 0.03 and 10 mm2. 20. The gas burner device according to claim 19, comprising: 21. Device according to claim 20, characterized in that the sound deadening layer (13) comprises at least one wire network. . 22. The sound deadening layer (13) is wholly or partially a porous mass of fibers (27) 21. The apparatus of claim 20.