EP0536556A2 - Brûleur pour combustibles liquides et/ou gazeux - Google Patents
Brûleur pour combustibles liquides et/ou gazeux Download PDFInfo
- Publication number
- EP0536556A2 EP0536556A2 EP92115625A EP92115625A EP0536556A2 EP 0536556 A2 EP0536556 A2 EP 0536556A2 EP 92115625 A EP92115625 A EP 92115625A EP 92115625 A EP92115625 A EP 92115625A EP 0536556 A2 EP0536556 A2 EP 0536556A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- secondary air
- burner
- tertiary
- air
- burner according
- 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- Withdrawn
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C7/00—Combustion apparatus characterised by arrangements for air supply
- F23C7/008—Flow control devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2204/00—Burners adapted for simultaneous or alternative combustion having more than one fuel supply
- F23D2204/10—Burners adapted for simultaneous or alternative combustion having more than one fuel supply gaseous and liquid fuel
Definitions
- the invention relates to a burner for liquid and / or gaseous fuels, which has in a burner housing a primary air pipe with a fuel outlet head having a fuel supply and coaxial with the primary air pipe has a secondary air pipe with a secondary air outlet at its free end and the emerging secondary air flow is directed obliquely to the burner axis.
- a burner is the subject of DE-A-27 24 532.
- Burners similar to the above are currently being built and are well known. They work on the principle of stage burning.
- the combustion air flows out of these pipes axially to the burner axis.
- the amount of air in the primary air pipe is so small that incomplete combustion takes place in the core zone of the flame.
- the secondary air pipe limits the secondary air outlet by a secondary air duct reducing ring which tapers in diameter towards the burner axis and merges into a diffuser ring on the outlet side.
- Such a secondary air duct reducing ring directs the secondary air flow obliquely towards the burner axis so that the secondary air is mixed in at a certain angle to the burner axis behind the primary flame with high controlled turbulence. Since the secondary air duct reducing ring merges into a diffuser on the outlet side, the burner according to the invention does not need to have a stone diffuser arranged in the boiler to stabilize the flame in order to thermally stabilize the flame formation. A stone diffuser, due to its peculiarity of heating up, significantly increases the NO x emission without, however, significantly improving the flame stability.
- the free cross section of the secondary air outlet can be optimally adjusted according to the flame pattern to be observed when the burner is in operation, if the axial distance between the diffuser ring and the end of the primary air pipe on the air outlet side can be changed by a secondary air adjusting device.
- a secondary air adjusting device makes it possible to change the exit velocity of the secondary air and thus also the pulse with a constant air mass flow.
- the Volume distribution of the air mass flows of the individual stages, i.e. the primary, secondary and tertiary air can be kept constant thanks to the invention despite the change in the pulse speed. This also allows the NO x content of the exhaust gas to be reduced and the other combustion values to be optimally coordinated.
- the structural outlay for adjusting the outlet cross section of the primary air pipe is particularly low if the secondary air duct reducing ring is axially displaceably arranged in the secondary air pipe and the secondary air adjusting device has an actuating rod which leads out of the burner housing and is connected to the secondary air reducing ring.
- a telescopic outer tube which can be displaced by means of the secondary air adjusting device, is arranged on the primary air tube on the air outlet side.
- the NO x emission can be further reduced in that the tertiary air pipe limits the tertiary air outlet by a tertiary air duct reducing ring which tapers in diameter in the direction of the burner axis .
- a tertiary air flow enables a particularly complete burnout at the edge of the flame.
- the tertiary air emerges with high pulse velocity from the tertiary air outlet designed as an annular nozzle and surrounds the flame front with an air curtain.
- This air curtain reduces the penetration of smoke gases from the outer backflow zone into the flame front by entraining these smoke gases, as a result of which the tertiary air is strongly rendered inert and there is an interference along the flame path.
- This expiry of Air curtain formation occurs because the secondary air duct reducing ring deflects the secondary air and then the diffuser ring forms a negative pressure area, which represents a separating layer between the secondary air flow and the tertiary air flow.
- the tertiary air outlet is provided between the tertiary air duct reducing ring of the tertiary air tube and the diffuser ring of the secondary air tube.
- the tertiary air duct reducing ring of the tertiary air tube is displaceable in or on the tertiary air tube and is axially displaceable by means of a tertiary air adjusting device.
- a baffle plate is arranged in the air outlet of the primary air pipe and a mixing body is arranged inside the primary air duct at the baffle plate.
- a baffle plate creates a vacuum region with a backflow zone which is advantageous for flame formation.
- the baffle plate enables extremely substoichiometric operation of the primary flame with high ignition stability and a large control range.
- the distance between the baffle plate and the mixing body is also variable and that the mixing body and the baffle plate can be retrofitted with an adjusting device.
- the secondary air outlet is provided behind the baffle plate as seen in the flow direction and the tertiary air outlet is provided behind the secondary air outlet as seen in the flow direction.
- the tertiary air duct reducing ring is at an angle of 30 ° to the direction of flow and the secondary air duct reducing ring is at an angle of 20 ° to the direction of flow and if the diffuser ring is at an angle of 25 ° extended to the direction of flow.
- the burner setting is carried out in such a way that the adjustment devices are mechanically fixed after setting optimal combustion values.
- Via a process control it is possible to set each burner operating point individually and automatically.
- the adjustment devices are driven by an electric motor and controlled via freely programmable electronics as a function of guide variables (power, oxygen content, nitrogen oxide content, flame stability, etc.).
- the process electronics can thus be designed so that the burner automatically adjusts to the lowest NO x values, taking into account the perfect burnout and the required output.
- the burner is particularly suitable for the combustion of oxygen-reduced exhaust gas (turbine exhaust gases) and combustible harmful gases. Furthermore, the burner is designed so that several combustion gases / harmful gases can be burned independently of one another or simultaneously.
- the burner is equipped with gas chambers that distribute the gases in lances, in which they are led to the burner outlet. This means that especially low calorific gases that need a support fire and harmful gases that have to be brought to a certain temperature level can be burned. Liquid waste fuels can also be burned.
- the burner can also be operated with flue gas recirculation to reduce nitrogen oxides without any problems, while achieving a wide control range with an absolutely stable flame.
- the burner shown in longitudinal section in FIG. 1 has a primary air pipe 2 in a burner housing 1, in which runs coaxially a fuel feed 3 designed as an oil lance and arranged in a holding pipe 3a and having a fuel outlet head 4 at its free end, which in this exemplary embodiment is an injection nozzle.
- Further supply pipes 5 can be arranged in the primary air pipe 2, via which fuel gas is supplied and / or, for example, flue gas is returned for further NO x reduction.
- the fuel supply 3 can also be designed for the supply of fuel gas instead of oil.
- a mixing body 6 is arranged on the holding pipe 3a of the fuel feed 3, which is exchangeably and is held on the holding pipe 3a of the fuel feed 3 so that it can be adjusted in the longitudinal direction of the burner.
- it is pushed with a sleeve 7 from the front onto the holding tube 3a of the fuel supply 3 and fixed in the desired position by a clamping screw 8.
- a baffle plate 9 behind the mixing body 6, which reduces the free outlet cross section of the primary air pipe 2 in the manner of an aperture.
- a secondary air tube 10 is arranged coaxially with the primary air tube 2, and a tertiary air tube 11 is in turn arranged coaxially for this purpose.
- the combustion air flows through an air inlet 12 into the primary air pipe 2, an air inlet 13 into the secondary air pipe 10 and a further air inlet 14 into the tertiary air pipe 11.
- Throttle valves 15 are arranged in the air inlets 12, 13, 14 for adjusting the amount of combustion air.
- the secondary air tube 10 has a secondary air outlet 16, which is not aligned coaxially to the burner axis, but obliquely to it.
- a secondary air outlet 16 which is not aligned coaxially to the burner axis, but obliquely to it.
- at the front end of the secondary air pipe 10 there is a diameter that tapers in the direction of flow and therefore arranged conical secondary air duct reducing ring 17, which is followed by a diffuser ring 18 in the direction of flow.
- a swirl body 21, to which the secondary air duct reducing ring 17 is attached is arranged to be axially displaceable between the primary air pipe 2 and the secondary air pipe 10 by means of an adjusting rod 20.
- the secondary air adjusting device 19 protrudes from the rear of the burner housing 1, so that the swirl body 21 and thus also the secondary air duct reducing ring 17 and the diffuser ring 18 can be axially displaced during operation of the burner.
- the tertiary air tube 11 forms a tertiary air outlet 22 which, just like the secondary air outlet 16, generates an air flow directed obliquely towards the burner axis.
- a tertiary air reducing ring 23 is provided, which is held axially displaceably in the tertiary air tube 11 by means of a cylindrical tube piece 24.
- an actuating rod 25 of a tertiary air adjusting device 26 is fastened, with which the tertiary air reducing ring 23 can be axially displaced during operation of the burner.
- the tertiary air outlet 22 is formed by a gap which is formed between the foremost end of the diffuser ring 18 and the foremost end of the tertiary air duct reducing ring 23.
- the secondary air outlet 16 when viewed in the flow direction, is located behind the primary air outlet and formed by the baffle plate 9 the tertiary air outlet 22 is again seen behind the secondary air outlet 16 in the flow direction.
- the embodiment according to FIG. 2 differs from that described above in that the secondary air outlet 16 is adjusted differently.
- the secondary air duct reducing ring 17 is firmly connected to the secondary air pipe 10.
- an outer tube 27 is telescopically displaceable, to which the actuating rod 20 of the secondary air adjusting device 19 leads. As can be seen in FIG. 1, the outer tube 27 projects beyond the foremost edge of the primary air tube 2. If you push the outer tube 27 further forward by means of the secondary air adjusting device 19, then the free cross section of the secondary air outlet 16 is reduced.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4133176 | 1991-10-07 | ||
| DE19914133176 DE4133176A1 (de) | 1991-10-07 | 1991-10-07 | Brenner fuer fluessige und/oder gasfoermige brennstoffe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0536556A2 true EP0536556A2 (fr) | 1993-04-14 |
| EP0536556A3 EP0536556A3 (en) | 1993-06-16 |
Family
ID=6442189
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19920115625 Withdrawn EP0536556A3 (en) | 1991-10-07 | 1992-09-12 | Burner for liquid and/or gaseous fuels |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0536556A3 (fr) |
| DE (1) | DE4133176A1 (fr) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998040668A1 (fr) * | 1997-03-07 | 1998-09-17 | F L Smidth & Co. A/S | Procede et bruleur pour l'introduction de combustible dans un four |
| EP0945678A3 (fr) * | 1998-03-25 | 2000-01-19 | ENEL S.p.A. | Brûleur à faible taux de NOx pour combustibles liquides et gazeux |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102563640A (zh) * | 2012-01-19 | 2012-07-11 | 东方电气集团东方锅炉股份有限公司 | 高效燃烧低污染排放油燃烧器 |
| DE102016125526B3 (de) * | 2016-12-22 | 2018-05-30 | Max Weishaupt Gmbh | Mischvorrichtung und Brennerkopf für einen Brenner mit reduziertem NOx-Ausstoß |
| AT524888A1 (de) | 2021-03-23 | 2022-10-15 | Mme Eng E U | Ultra-Low-NOx-Brenner |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE549668C (de) * | 1925-11-05 | 1932-04-30 | Franz Karl Hetsch | Brenner fuer fluessigen und gas- oder staubfoermigen Brennstoff |
| FR1479242A (fr) * | 1965-08-18 | 1967-05-05 | Swan | Dispositifs de mélange de fluides |
| GB1099959A (en) * | 1965-10-28 | 1968-01-17 | Janos Miklos Beer | Improvements in or relating to burners for pulverised coal or like solid fuel or for liquid or gaseous fuel |
| DE1751274A1 (de) * | 1968-05-02 | 1971-07-08 | Kraftwerksanlagenbau Veb K | Luftleiteinrichtung fuer OEl- oder Gasbrenner |
| DE2724532A1 (de) * | 1977-05-31 | 1978-12-14 | Peabody Environmental Systems | Brennervorrichtung fuer oel und/oder gas |
| DE2809114A1 (de) * | 1978-03-03 | 1979-09-06 | Elco Oel & Gasbrenner | Brennkopf fuer brennanlagen |
| DE2812552A1 (de) * | 1978-03-22 | 1979-09-27 | Babcock Ag | Gekuehlte brennerkehle |
| DE7904137U1 (de) * | 1979-02-15 | 1982-09-30 | Pillard Feuerungen GmbH, 6204 Taunusstein | Brenner fuer pulverfoermige oder feinkoernige feste brennstoffe und kombinationen fester, fluessiger und/oder gasfoermiger brennstoffe fuer weitmoeglichste einstellung der flammenform auch waehrend des betriebes |
| SE439978B (sv) * | 1979-11-29 | 1985-07-08 | Allterm Ab | Anordning vid brennare |
| DE3518080A1 (de) * | 1985-05-20 | 1986-11-20 | Stubinen Utveckling AB, Stockholm | Verfahren und vorrichtung zum verbrennen fluessiger und/oder fester brennstoffe in pulverisierter form |
-
1991
- 1991-10-07 DE DE19914133176 patent/DE4133176A1/de not_active Withdrawn
-
1992
- 1992-09-12 EP EP19920115625 patent/EP0536556A3/de not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998040668A1 (fr) * | 1997-03-07 | 1998-09-17 | F L Smidth & Co. A/S | Procede et bruleur pour l'introduction de combustible dans un four |
| EP0945678A3 (fr) * | 1998-03-25 | 2000-01-19 | ENEL S.p.A. | Brûleur à faible taux de NOx pour combustibles liquides et gazeux |
Also Published As
| Publication number | Publication date |
|---|---|
| DE4133176A1 (de) | 1993-04-08 |
| EP0536556A3 (en) | 1993-06-16 |
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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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| 18D | Application deemed to be withdrawn |
Effective date: 19931217 |