• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:

    公开号:NL1017071A1
    申请号:NL1017071
    申请日:2001-01-10
    公开日:2001-07-16
    发明作者:Juergen Waidner；Marcus Bienzle
    申请人:Bosch Gmbh Robert；
    IPC主号:
    专利说明:

    BURNER WITH A CATALYTIC ACTIVE POROUS BODY
    State of the art
    The invention relates to a burner with a catalytically active porous body, wherein the fuel is supplied to the porous body via a non-return guarantee and wherein the fuel supplied is combusted in the region of the porous body by ignition.
    In the known burners of this type, the porous bodies are provided in their entirety with a catalytic coating. In addition, it comes to operating temperatures in various areas of the porous body, whereby the catalyst cannot function at all or works optimally at all. In areas with high operating temperatures, the catalyst cannot be reversibly deactivated.
    The object of the invention is to provide a burner with a catalytically active porous body, the catalysts in the porous body always operating at an optimum operating temperature, so that the catalyst becomes inoperative or dies due to too high or too low a temperature. avoided. This problem is solved according to the invention in that the porous body is provided with at least one region with a catalytically active coating, which turns away from the recoil safeguard, into an uncoated region of the porous body, after the recoil guarantee, and in that the catalytic coated areas are adapted to the working temperatures of their areas.
    Moreover, this design of the porous body makes it possible to avoid the emission of harmful substances and to avoid the fuel sludge occurring in fully catalytically coated porous bodies and the associated emission of unburned hydrocarbons.
    For example, a fuel sludge can occur with partial deactivation of the catalyst.
    The catalytically coated area is located adjacent to the inflow side of the fuel, the gas-air mixture, and thus adjacent to the non-return guarantee. When cooled, this recoil safeguard prevents overheating of the catalyst in the subsequent catalytically coated region of the porous body. This can also already be done by cooling the non-return guarantee via the fuel that flows out.
    The porosity of the or the catalytic regions can be designed such that either a combustion zone can be formed in any case (high porosity) or that a combustion zone can only be formed on the basis of the catalytic coating (low porosity).
    The fuel is ignited in the uncoated area of the porous body. The heat radiated from this area heats the adjacent catalytically coated area to get its operating temperature.
    At a sufficiently high porosity, the gas-air mixture can be ignited outside the pore body.
    In the catalytically coated region of the porous body, part of the gas-air mixture is catalytically converted. The non-reacting part of the gas-air mixture is burned in the non-catalytically coated, i.e. uncoated, area in a conventional manner.
    The structure of the porous body with different areas can vary. Thus, according to one embodiment, it may be provided that the catalytically coated regions and the uncoated region are elements of a one-piece porous body or that the catalytically coated regions and the uncoated region are formed as separate layers of a composite, porous body .
    According to a further embodiment, a simplification is obtained by designing the non-return fuse as part of a one-piece porous body or as a separate porous layer of the porous body.
    If the catalytically coated portion of the porous body comprises multiple regions, provision is made for the catalytically coated regions of the porous body from the recoil guarantee to the uncoated region to be adapted to the increasing temperature profile in terms of the operating temperature. For burners with porous bodies, in which, due to their special design, a distribution deviating from the temperature distribution described above, the different catalyst regions are applied in such a way that the catalyst with the highest temperature carrying capacity is arranged in the hottest zone. All further zones can be arranged in such a way that they are in an optimum temperature range for them. Different catalysts, such as ceramic or metallic catalysts, can be used in accordance with the operating temperatures of these regions. In addition, the catalytically coated areas, the uncoated area and the kickback guarantee may be provided with different pore sizes adapted to their operating conditions.
    According to one embodiment, for coating the areas, it is provided that the catalysts are introduced or applied to the porous body or its separate layers by means of a dipping process or also by spraying, in particular during a flame spraying process.
    The invention is further elucidated on the basis of exemplary embodiments of porous bodies with a kickback guarantee, shown in the drawing. Thereby shows:
    Fig. 1 a one-piece pore burner with separate back guarantee;
    Fig. 2 a pore burner composed of two different layers and a separate blowback guarantee layer;
    Fig. 3 a pore burner composed of three different layers and a separate blowback guarantee layer; and
    Fig. 4 shows a pore burner composed of an uncoated, catalytically coated layer and a blowback guarantee layer.
    The pore burner according to Fig. 1 is composed of a one-piece porous body 10 and a separate, low-built backlash guarantee 20, through which the gas-air mixture is supplied as fuel. The porous body 10 is one-piece and includes two areas 11 and 15, only the area 11 adjoining the kickback guarantee 20 is catalytically coated, while the area 15 remote from the kickback guarantee 20 is uncoated. Ignition of the gas-air mixture takes place in this region 15. The catalyst can be introduced into the region 11 by dipping the base region of the porous body 10. Spraying of the catalyst in region 11 is also possible. Suitable catalysts are noble metal-containing and ceramic catalysts, such as Perovskite, whose properties are adapted to the operating temperature in the region 11. The ceramic catalysts are suitable for a temperature range of approximately 600 ° C to 1000 ° C, while the metallic catalysts work well even from working temperatures from 300 ° C, and can already be destroyed at about 500 ° C due to structural changes.
    As Fig. 2 shows with a composite pore burner, the regions 11 and 15 can be formed as separate layers, such as the blowback guarantee 20. The ignition in the uncoated region 15 is retained and the catalytic coating of the region 11 is adapted to the temperature profile. between the kickback guarantee 20 and the uncoated area 15. The porosity of the area 11, which is formed as a layer, can also deviate in terms of porosity from that of the uncoated area 15, more particularly being smaller.
    In the pore burner of FIG. 3 with two different catalytically coated regions 11 and 12, the working temperature regions are adapted to the temperature variation in the composite porous body 10 with different catalysts. For example, the low-level region 11 can be coated with a metallic catalyst. works well in a temperature range of 300 ° C to 500 ° C, while area 12 may be provided with a ceramic catalyst and a temperature range of 600 ° C to 1000 ° C. The gas-air mixture is supplied via the blowback safeguard, which can be additionally cooled. The uncoated area 15 of the pore burner is in the area of the igniter and away from the blowback guarantee. Areas 11 and 12 may be formed as layers and coated with the catalysts to the uncoated area 15. The recoil deposit 20 may be formed as a separating member and with the porous formed from the layers of areas 11, 12 and 15 body 10 as a pore burner.
    As the pore burner of Fig. 4 shows, the blowback guarantee 20 can also be constructed as a catalytically coated area of the porous body 10, this area being surrounded in such a way that with low porosity and an operating temperature of about 300 ° C to 500 ° C flame formation is prevented. The flow region first region of the pore burner thus acts simultaneously as a backlash guarantee 20. This region may be designed as a separate layer or integrated in the one-piece, porous body 10. One or more catalytically coated regions, for example 11, adjoin the catalytically coated region which acts as a kickback guarantee 20. The last catalytically coated region in the direction of flow of the gas-air mixture adjoining the uncoated region 15 is adapted to an operating temperature of approximately 600 ° C to 1000 ° C.
    It should also be noted that all areas 11, 12 and 15 of the pore burner shown, including the one-piece porous body recoil deposit and / or may consist of layers of different porosity and / or different coatings adapted to the flow temperature trend.
    权利要求:
    Claims (9)
    [1]
    Burner with a catalytically active porous body, the fuel being supplied to the porous body via a recoil safeguard and the fuel supplied in the region of the porous body being ignited by ignition, characterized in that the porous body (10) subsequent to the recoil safeguard (20) is provided with at least one region with a catalytically active coating (11) which turns away from the recoil safeguard (20) into an uncoated region (15) of the porous body (10) and that the catalytically active regions (11, 12) are adapted to the operating temperatures of their regions (11, 12).
    [2]
    Burner according to claim 1, characterized in that the catalytically active regions (11, 12) and the catalytically inactive region (15) are elements of a one-piece porous body (10).
    [3]
    Burner according to claim 1, characterized in that the catalytically active regions (11, 12) and the uncoated region (15) are formed as separate layers of a composite, porous body (10).
    [4]
    Burner according to one of Claims 1 to 3, characterized in that the non-return safeguard (20) is designed as an element of a one-piece porous body (10) or as a separate porous layer from the porous body (10).
    [5]
    Burner according to any one of claims 1 to 4, characterized in that the catalytically active regions (11, 12) of the porous body (10) are from the recoil deposit (20) to the uncoated region (15) as regards the operating temperature adapted to the temperature trend.
    [6]
    Burner according to any one of claims 3 to 5, characterized in that the separated layers of the catalytically active regions (11, 12) are provided with different catalysts (ceramic or metallic catalysts).
    [7]
    Burner according to any one of claims 1 to 6, characterized in that the catalytically coated areas (11, 12) the uncoated area (15) and the non-return guarantee (20) are provided with different pore sizes adapted to their operating conditions.
    [8]
    Burner according to any one of claims 1 to 7, characterized in that the ignition of the supplied fuel, a gas-air mixture, takes place in the uncoated region (15) of the porous body (10).
    [9]
    Burner according to any one of claims 1 to 8, characterized in that the catalysts are introduced or applied in the porous body (10) or its separated layers by immersion or spraying, in particular by a flame spraying method.
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    同族专利:
    公开号 | 公开日
    DE10000652C2|2002-06-20|
    DE10000652A1|2001-07-19|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    WO1982002007A1|1980-12-09|1982-06-24|Sadamori Hiroki|Catalyst for low-temperature combustion and process for its preparation|
    JPH0335572B2|1985-06-21|1991-05-28|Matsushita Electric Ind Co Ltd|
    DE3732656A1|1987-09-28|1989-04-13|Edt Technik Consult Und Umwelt|Boiler with burner for liquid or gaseous fossil fuels|
    US5249953A|1989-06-16|1993-10-05|Hercules Canada, Inc.|Gas distributing and infrared radiating block assembly|
    DE4322109C2|1993-07-02|2001-02-22|Franz Durst|Burner for a gas / air mixture|
    DE4324644A1|1993-07-22|1995-01-26|Gossler Kg Oscar|Ceramic combustion carrier element for surface burner and method for its production|
    DE19718885C2|1997-05-03|2003-10-09|Bosch Gmbh Robert|gas burner|US20050053816A1|2002-11-15|2005-03-10|Anuj Bhargava|Burner for combusting the anode exhaust gas stream in a PEM fuel cell power plant|
    EP1701092A1|2005-02-18|2006-09-13|CRAMER SR s.r.o.|Burner plate for a radiant burner|
    DE102006013445A1|2006-03-17|2007-09-20|Gvp Gesellschaft Zur Vermarktung Der Porenbrennertechnik Mbh|Roller with heating device|
    RU2546391C2|2013-08-23|2015-04-10|Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Омский государственный технический университет"|Piston compressor without lubrication|
    法律状态:
    2001-09-03| AD1A| A request for search or an international type search has been filed|
    2004-04-01| RD2N| Patents in respect of which a decision has been taken or a report has been made (novelty report)|Effective date: 20040205 |
    优先权:
    申请号 | 申请日 | 专利标题
    DE2000100652|DE10000652C2|2000-01-11|2000-01-11|Burner with a catalytically active porous body|
    DE10000652|2000-01-11|
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