EP0990104A1 - Katalytischer brenner - Google Patents
Katalytischer brennerInfo
- Publication number
- EP0990104A1 EP0990104A1 EP98936347A EP98936347A EP0990104A1 EP 0990104 A1 EP0990104 A1 EP 0990104A1 EP 98936347 A EP98936347 A EP 98936347A EP 98936347 A EP98936347 A EP 98936347A EP 0990104 A1 EP0990104 A1 EP 0990104A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- catalyst
- burner according
- projections
- parts
- wall part
- 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.)
- Withdrawn
Links
Classifications
-
- 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
- F23D14/18—Radiant burners using catalysis for flameless combustion
Definitions
- the invention relates to a catalytic burner according to the preamble of claim 1.
- DE 43 17 554 AI describes a two-stage catalytic burner, which in its first stage consists of a flow plate in the form of a tube catalytically coated on the outside and has a honeycomb catalyst as the second stage.
- the main turnover of the fuel takes place in the first stage, which emits part of the heat to a water cycle via radiation.
- the remaining heat of reaction is given off to the reaction gas.
- the turnover in the first stage is 60 to 80% depending on the load. It proves to be unfavorable that the conversion in the first stage decreases with increasing load, so that the honeycomb catalytic converter has to achieve a disproportionate amount of conversion with increasing fuel gas load in order to completely ensure fire. This can lead to material loads in the second stage.
- the temperatures in the first stage also depend on the reaction route.
- the fuel gas is mainly converted in the first third of the pipe.
- a uniform distribution of the temperatures over the reaction path cannot be achieved with a design for different burner capacities. These factors require a very careful process engineering of the overall burner.
- reaction density at the catalytically active zone must be sufficiently high to implement a compact and powerful burner, but the reaction temperature must be kept at a level which is suitable for the material by suitable mass transfer or heat transfer conditions.
- a catalytic burner is also known from JP 4-240 307 A, in which air and a gaseous one
- Fuel is introduced into a mixing chamber within an aluminum block. Starting from the mixing chamber, several holes that lead to the outside lead through the aluminum block. The holes are on the side facing the mixing chamber Catalyst material filled. The mixed gas flows through it, so that combustion takes place in the catalyst material. The resulting combustion products are led to the outside of the aluminum block ib.
- the heat of combustion is absorbed by the aluminum block. Since the catalyst material is in direct contact with it, the heat transfer essentially takes place only by heat conduction, but hardly by heat radiation. This makes stable burner operation difficult.
- the older, unpublished patent application 196 04 263.1 discloses a catalytic burner with fuel and air supply devices with at least one catalyst and coolant-flowed wall parts, in which the heat transfer from the catalyst to the wall parts takes place essentially by radiation.
- This burner ensures a simple process engineering structure and enables a combustion gas conversion on catalytically active surfaces as well as a high degree of modulation.
- the fuel / air mixture is passed through the plate-shaped catalyst and largely implemented in it.
- the catalyst structure is relatively thin, but the catalytic surface is large compared to that of the first stage of the burner according to DE 43 17 554 AI, so that a relatively high conversion can be achieved.
- the area or volume-related power (power density) is often not sufficient with this burner.
- the power density can be provided can be increased to a multiple, for example 3 to 5 times the line density of the aforementioned catalytic burner according to patent application 196 04 263.1.
- the invention enables very high reaction densities to be achieved in the case of strongly exothermic or endothermic catalytic reactions without excessive temperature differences or temperature peaks occurring in the reaction zone and the associated problems (material stability and the like).
- the power and air ratio can also be easily modulated.
- Fig. 2 shows the schematic structure of a catalytic burner according to a second embodiment
- FIG. 3 shows the schematic structure of a catalytic burner according to a third
- a fuel / air mixture indicated by an arrow A is introduced into a space 1 below a cooling / distributor plate 2, which is traversed by channels 3 for conducting a coolant.
- a cooling / distributor plate 2 which is traversed by channels 3 for conducting a coolant.
- narrow passages 4 in the form of small bores or slots, the mixture flows evenly distributed into the space between the cooling / distributor plate 2 and a catalyst 5 with a honeycomb structure.
- the cooling / distributor plate 2 is provided on the side facing the catalytic converter 5 with plate-shaped projections which form pockets in which correspondingly shaped projections of the catalytic converter 5 are received. There is a gap of essentially constant thickness between the respective projections of the cooling / distributor plate 2 and the catalyst 5.
- the surface of the cooling / distribution plate 2 facing the catalyst 5 is also coated with an infrared radiation-absorbing layer 6.
- the reaction of the fuel / air mixture takes place within the catalyst 5 with the release of heat instead of. Due to the toothed arrangement of the respective protrusions, the entire surface of the protrusions of the catalyst 5 thus serves as a heat radiation surface and the entire surface of the protrusions of the cooling / distribution plate 2 serves as radiation absorption (absorber) surface. This increases the heat exchange area considerably compared to a flat design. It can dissipate significantly more heat and thereby significantly increase the power density without increasing the temperature level in the catalytic converter.
- the material of the cooling / distribution plate 2 has good thermal conductivity, its temperature can also be kept very low in the area of the projections. Since the radiation of a body changes with the fourth power of its temperature, the heat dissipation regulates itself over a wide output range due to the radiation exchange between the catalytic converter 5 and the cooling / distributor plate 2, so that the burner has a high modulation in output without overheating.
- the influence of the temperature of the cooling / distribution plate 2 is extremely small due to the coupling which is dependent on the fourth power of the temperature. Accordingly, a temperature of the cooling / distribution plate 2 in the range of, for example, 100 to 500 ° C. has only a slight influence on the heat output of the catalyst 5 with a temperature of, for example, 900 ° C. Thus, the projections of the cooling / distribution plate can 2 be made relatively narrow, since their heat conduction increases with an increased temperature difference to the cooling medium. ⁇ to to in o in o in in in
- the projections can thus also run perpendicular to the channels 3 for the coolant.
- the projections of the cooling / distribution plate 2 can be arranged crosswise, so that a checkerboard pattern results.
- the catalyst 5 then projects into the cooling structure with individual pins, or the grains of the catalyst bed lie in the corresponding empty spaces of the cooling structure. Conversely, pins emerging from the cooling / distributor plate 2 can protrude into the honeycomb structure of the catalytic converter 5.
- thermoelectric converters thermophotovoltaic cells or the like, for example, part of the heat generated is converted into electrical current and the rest is dissipated via the coolant flow.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Gas Burners (AREA)
- Spray-Type Burners (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19726645 | 1997-06-18 | ||
DE19726645A DE19726645C2 (de) | 1997-06-18 | 1997-06-18 | Katalytischer Brenner |
PCT/EP1998/003607 WO1998058208A1 (de) | 1997-06-18 | 1998-06-17 | Katalytischer brenner |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0990104A1 true EP0990104A1 (de) | 2000-04-05 |
Family
ID=7833402
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98936347A Withdrawn EP0990104A1 (de) | 1997-06-18 | 1998-06-17 | Katalytischer brenner |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0990104A1 (de) |
DE (1) | DE19726645C2 (de) |
WO (1) | WO1998058208A1 (de) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19904921C2 (de) * | 1999-02-06 | 2000-12-07 | Bosch Gmbh Robert | Erhitzer für Flüssigkeiten |
DE10032190C2 (de) * | 2000-07-01 | 2002-07-11 | Bosch Gmbh Robert | Gasbrenner mit einem Brennkörper aus porösem Material |
EP1191074A1 (de) * | 2000-09-25 | 2002-03-27 | Sigma Coatings B.V. | Wässrige Zweikomponenten-Schutzbeschichtungssysteme |
DE102004006514A1 (de) * | 2004-02-10 | 2005-08-25 | Voith Paper Patent Gmbh | Verfahren zur Beheizung einer Walze sowie beheizbare Walze |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1197078B (it) * | 1986-08-07 | 1988-11-25 | Umberto Viani | Caldaie con combustione catalitica di metano per il riscaldamento di acqua per usi domestici |
DE4317554C2 (de) * | 1993-05-26 | 1997-03-06 | Fraunhofer Ges Forschung | Warmwasserbereiter |
DE19542706A1 (de) * | 1995-11-16 | 1997-05-22 | Buderus Heiztechnik Gmbh | Katalytischer Brenner |
DE19604263A1 (de) * | 1996-02-06 | 1997-08-14 | Fraunhofer Ges Forschung | Katalytischer Brenner |
-
1997
- 1997-06-18 DE DE19726645A patent/DE19726645C2/de not_active Expired - Fee Related
-
1998
- 1998-06-17 EP EP98936347A patent/EP0990104A1/de not_active Withdrawn
- 1998-06-17 WO PCT/EP1998/003607 patent/WO1998058208A1/de not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO9858208A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE19726645A1 (de) | 1998-12-24 |
WO1998058208A1 (de) | 1998-12-23 |
DE19726645C2 (de) | 2001-07-05 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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17P | Request for examination filed |
Effective date: 19991022 |
|
AK | Designated contracting states |
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GRAG | Despatch of communication of intention to grant |
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17Q | First examination report despatched |
Effective date: 20010323 |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20011110 |