EP0092002B1 - Fuel atomisers for oil burners - Google Patents
Fuel atomisers for oil burners Download PDFInfo
- Publication number
- EP0092002B1 EP0092002B1 EP82302010A EP82302010A EP0092002B1 EP 0092002 B1 EP0092002 B1 EP 0092002B1 EP 82302010 A EP82302010 A EP 82302010A EP 82302010 A EP82302010 A EP 82302010A EP 0092002 B1 EP0092002 B1 EP 0092002B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- oil
- mixing chamber
- ports
- burner
- exit
- 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.)
- Expired
Links
- 239000000446 fuel Substances 0.000 title abstract description 6
- 239000012530 fluid Substances 0.000 claims abstract description 33
- 239000007921 spray Substances 0.000 claims abstract description 10
- 238000002347 injection Methods 0.000 claims description 9
- 239000007924 injection Substances 0.000 claims description 9
- 238000010276 construction Methods 0.000 description 10
- 239000000203 mixture Substances 0.000 description 4
- 238000000889 atomisation Methods 0.000 description 3
- 230000003134 recirculating effect Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
- F23D11/10—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space the spraying being induced by a gaseous medium, e.g. water vapour
- F23D11/101—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space the spraying being induced by a gaseous medium, e.g. water vapour medium and fuel meeting before the burner outlet
- F23D11/102—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space the spraying being induced by a gaseous medium, e.g. water vapour medium and fuel meeting before the burner outlet in an internal mixing chamber
- F23D11/103—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space the spraying being induced by a gaseous medium, e.g. water vapour medium and fuel meeting before the burner outlet in an internal mixing chamber with means creating a swirl inside the mixing chamber
Definitions
- This invention relates to oil fuel atomisers for use in oil burners.
- an atomiser for an oil burner comprising a body having an exit leading outwardly from an annular mixing region, means for injecting oil through oil inlet ports into the mixing region and means for injecting an atomising fluid into the mixing region at a plurality of positions in a wall of the mixing region to form an oil spray.
- the mixing region is an annular groove.
- a common practice in oil burners for large boilers is to use atomisers of the Y-jet type in which a number of ports are arranged at an angle to the burner axis to produce a hollow conical spray.
- Each exit port has a co-axial atomising fluid port for injection of the atomising fluid (which may be steam or air) and also has an oil port entering at an angle.
- a degree of mixing between the atomising fluid and oil takes place in the exit port and the two phase mixture then expands out of the exit port to form a spray.
- One of the problems with this type of atomiser is that the jet of oil from the oil port tends to impinge on the opposite side of the exit port where it forms a thick film. This thick film can persist through the exit port to the end thereof and hence lead to the formation of relatively large oil droplets.
- a multi-jet atomiser for an oil burner comprises a body having a plurality of exit ports leading outwardly from an annular mixing chamber to form a hollow conical spray, means for injecting oil through oil inlet ports into the mixing chamber, the oil being injected at each inlet port in a direction to produce a toroidal recirculation in the annular mixing chamber with the injected oil from each inlet port passing close to an exit port at approximately right angles to the axis of that exit port and means for injecting an atomising fluid into the mixing chamber at a plurality of positions in a wall of the mixing chamber.
- the atomising fluid is injected into a turbulent recirculating flow region through ports in the wall of the mixing chamber opposite the exit ports.
- the atomising fluid thus becomes well mixed with the oil and carries part of the recirculating mixture into the exit ports in the appropriate directions to pass through these ports and to expand outwardly therefrom as a fine spray.
- a plenum chamber or a plurality of plenum chambers through which the oil is fed into the aforementioned oil inlet ports.
- the aforementioned annular mixing chamber preferably has a curved surface opposite each oil injection port shaped to direct the impinging oil around a curved path towards the axis of the burner assembly and hence to promote the toroidal recirculation.
- the aforesaid means for injecting an atomising fluid into the mixing chamber may be at a plurality of positions in a wall of the mixing chamber opposite the exit ports.
- the mixing chamber may have walls shaped to guide the injected oil in a direction across the exit ports and thence around in a recirculatory path over the wall opposite the exit ports.
- the annular mixing chamber and, if provided, the plenum chamber or chambers are constituted by regions between the end of a main burner body element containing a central atomising fluid passage extending axially through the body element to atomising fluid injection ports in the end thereof and a cap which is secured, e.g. threaded, onto the main burner body element and which has the aforesaid exit ports.
- the main burner body element may contain a central oil passage extending axially through the body element to said oil inlet ports.
- the atomising fluid is passed through passages around the central oil passage.
- the atomiser has a main elongate body member 10 with a central passage 11 extending axially through the member 10 towards the end thereof to carry an atomising fluid, either steam or air.
- This passage 11 terminates in a frusto conical face 12 from which a number of ports 13 extend, these ports leading into an annular mixing chamber 15.
- This mixing chamber has a plurality of exit ports 14 as seen most clearly in Figure 1.
- These ports 14 are formed in cap member 16, internally threaded at 17, which fits over the end of the body member 10.
- the ports 13 and the ports 14 are at angles of about 45° to the axis of the assembly. These ports 13 and 14 need not necessarily be at the same angle to the axis of the assembly. The angles for the exit ports 14 would depend on the desired cone angle of the spray. In some cases it may be preferred to make the inlet ports 13 parallel to the axis of the assembly.
- Oil from an annular region 20 around the outside of the body member 10 passes through a plurality of oil ducts 21 in the cap member 16, into an annular plenum chamber 22. From the plenum chamber, the oil is injected into a mixing chamber 15 through a ring of ports 23 through an upstanding part 24 in the body member 10. The injection from the ports 23 into the mixing chamber is in a direction such as to produce a toroidal circulation of the oil in the mixing chamber 15.
- the oil ports 23 are arranged to produce oil jets which pass close to the exit ports 14 at approximately right angles to the axis of the exit ports.
- the plenum chamber 22 and mixing chamber 15 are formed as gaps between the cap member 16 and the main body member 10.
- the shaping of these members 10, 16 is such that, when the cap member is screwed in position on the body member, the gaps between the cap member and body member form the mixing chamber and plenum chamber.
- the exit ports 14 have their axes defining a cone, the axis of this cone being aligned with the longitudinal axis of the burner and the apex of the cone being on that longitudinal axis.
- the oil spray from the plurality of exit ports 14 thus is in the general form of a hollow cone.
- the atomising fluid is injected through ports on the opposite wall of the chamber, that is the wall facing the exit ports. This wall is conical. It is not necessary in this construction however that the cap member 16 is angularly aligned with respect to the body element 10. Alignment of the injection ports and exit ports is not critical and, in the particular embodiment illustrated, there are two rows of injection ports 13 and one row of exit ports 14. The fluid entering the exit ports is well mixed in the mixing chamber and is forced into the exit ports. This construction gives good atomisation.
- the simple construction having a cap 16 screwed onto the body member 10 enables the atomiser to be easily cleaned after these parts are separated.
- the exit ports 14 are evenly spaced with their axes lying on the same cone. In some cases, however, it may be advantageous to have these exit ports on more than one cone.
- the ports 14 need not necessarily be evenly spaced; they may be irregularly spaced or grouped.
- the atomising fluid ports are directly opposite and pointing towards the exit ports.
- Figure 3 illustrates a modification of that construction and the same reference characters are used to indicate corresponding components.
- the atomising fluid inlets to the mixing chamber, as shown at 30, produce atomising fluid jets which tend to counter the toroidal circulation produced by the oil jets 23. This may be advantageous in some cases to enhance mixing with the oil.
- the inlets to the atomising fluid ports 30 are at a greater distance from the atomiser axis than in the arrangement of Figures 1 and 2, it is easier to provide the requisite number of ports.
- the atomising fluid is fed axially through a central passage 11 in the main burner body 10.
- it may be preferred to reverse the position of the oil and atomising fluid feeds the oil feed being axially through a passage 41 and the atomising fluid being from an annular region 42 around the outside of the body member 10.
- This arrangement makes the incorporation of sufficient atomising fluid port area much easier by locating these ports as far as possible from the atomiser axis.
- the fact that the oil ports shown at 43 in Figure 4 are now much closer to the axis is not too much of an imposition because the total oil port area is generally significantly less than the total atomising fluid port area.
- Figure 5 illustrates a modification of Figure 4 in which the oil ports, shown at 50, are approximately parallel to the atomiser axis.
- the mixing chamberwall is shaped to direct the oil jets across the approach region to the exit ports. This arrangement may simplify manufacture.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Nozzles For Spraying Of Liquid Fuel (AREA)
Abstract
Description
- This invention relates to oil fuel atomisers for use in oil burners.
- In US-A-1 785 802 there is disclosed an atomiser for an oil burner comprising a body having an exit leading outwardly from an annular mixing region, means for injecting oil through oil inlet ports into the mixing region and means for injecting an atomising fluid into the mixing region at a plurality of positions in a wall of the mixing region to form an oil spray. In that specification, the mixing region is an annular groove.
- Since the date of the above-mentioned reference, there have been very considerable developments in the construction of atomisers for oil burners. Improved atomisation enables the emission of unburned carbon to be reduced even although, in modern practice, much lower quality oil fuel is employed in large boilers. These developments have produced burners with improved efficiency and consistency of atomisation, even with the much larger throughput of fuel now required and also provide for directing the atomised fuel into the furnace in an improved manner.
- A common practice in oil burners for large boilers is to use atomisers of the Y-jet type in which a number of ports are arranged at an angle to the burner axis to produce a hollow conical spray. Each exit port has a co-axial atomising fluid port for injection of the atomising fluid (which may be steam or air) and also has an oil port entering at an angle. A degree of mixing between the atomising fluid and oil takes place in the exit port and the two phase mixture then expands out of the exit port to form a spray. One of the problems with this type of atomiser is that the jet of oil from the oil port tends to impinge on the opposite side of the exit port where it forms a thick film. This thick film can persist through the exit port to the end thereof and hence lead to the formation of relatively large oil droplets.
- In British Patent Specification No. 1470671 there is described an atomiser in which the oil is introduced into the exit ports either axisymmetrically (that is symmetrical with regard to the axis of the exit port) through an annular port or symmetrically through a number of discrete oil ports. This arrangement prevents the formation of a thick asymmetric oil film. In the construction described in the British Specification No. 1470671, the ports are formed as a number of inserts which are mounted in a unitary body. This construction gives a significant improvement in performance over a Y-jet but there can be problems in the cleaning of this type of atomiser.
- In accordance with the present invention a multi-jet atomiser for an oil burner comprises a body having a plurality of exit ports leading outwardly from an annular mixing chamber to form a hollow conical spray, means for injecting oil through oil inlet ports into the mixing chamber, the oil being injected at each inlet port in a direction to produce a toroidal recirculation in the annular mixing chamber with the injected oil from each inlet port passing close to an exit port at approximately right angles to the axis of that exit port and means for injecting an atomising fluid into the mixing chamber at a plurality of positions in a wall of the mixing chamber.
- With this construction, the atomising fluid is injected into a turbulent recirculating flow region through ports in the wall of the mixing chamber opposite the exit ports. The atomising fluid thus becomes well mixed with the oil and carries part of the recirculating mixture into the exit ports in the appropriate directions to pass through these ports and to expand outwardly therefrom as a fine spray.
- Conveniently there is provided a plenum chamber or a plurality of plenum chambers through which the oil is fed into the aforementioned oil inlet ports.
- The aforementioned annular mixing chamber preferably has a curved surface opposite each oil injection port shaped to direct the impinging oil around a curved path towards the axis of the burner assembly and hence to promote the toroidal recirculation.
- The aforesaid means for injecting an atomising fluid into the mixing chamber may be at a plurality of positions in a wall of the mixing chamber opposite the exit ports.
- The mixing chamber may have walls shaped to guide the injected oil in a direction across the exit ports and thence around in a recirculatory path over the wall opposite the exit ports.
- Conveniently the annular mixing chamber and, if provided, the plenum chamber or chambers are constituted by regions between the end of a main burner body element containing a central atomising fluid passage extending axially through the body element to atomising fluid injection ports in the end thereof and a cap which is secured, e.g. threaded, onto the main burner body element and which has the aforesaid exit ports.
- Alternatively the main burner body element may contain a central oil passage extending axially through the body element to said oil inlet ports. In this case the atomising fluid is passed through passages around the central oil passage.
- The following is a description of a number of embodiments of the invention, reference being made to the accompanying drawings in which:-
- Figure 1 is a front elevation of an atomiser for an oil burner;
- Figure 2 is a section along the line 2-2 of Figure 1 through the front part of the burner, showing the atomiser; and
- Figures 3,4 and 5 are sections, similarto Figure 2, through the front parts of burners forming further embodiments of the invention.
- Referring to Figures 1 and 2, the atomiser has a main
elongate body member 10 with acentral passage 11 extending axially through themember 10 towards the end thereof to carry an atomising fluid, either steam or air. Thispassage 11 terminates in a frustoconical face 12 from which a number ofports 13 extend, these ports leading into anannular mixing chamber 15. This mixing chamber has a plurality ofexit ports 14 as seen most clearly in Figure 1. Theseports 14 are formed incap member 16, internally threaded at 17, which fits over the end of thebody member 10. In the particular embodiment, theports 13 and theports 14 are at angles of about 45° to the axis of the assembly. Theseports exit ports 14 would depend on the desired cone angle of the spray. In some cases it may be preferred to make theinlet ports 13 parallel to the axis of the assembly. - Oil from an
annular region 20 around the outside of thebody member 10 passes through a plurality ofoil ducts 21 in thecap member 16, into anannular plenum chamber 22. From the plenum chamber, the oil is injected into amixing chamber 15 through a ring ofports 23 through anupstanding part 24 in thebody member 10. The injection from theports 23 into the mixing chamber is in a direction such as to produce a toroidal circulation of the oil in themixing chamber 15. Theoil ports 23 are arranged to produce oil jets which pass close to theexit ports 14 at approximately right angles to the axis of the exit ports. These oil jets are directed towards acurved surface 25 of the mixing chamber, this surface being shaped so that the oil is diverted around a curved path inwardly towards the axis of the burner assembly. This shaping facilitates the recirculation of the injected oil. It will be seen that the atomising fluid is injected through theports 13 into the mixing chamber at an angle to the direction of injection of the oil throughports 23. In the mixing chamber, the atomising fluid becomes well mixed with the oil. In the particular example illustrated two rows ofports 13 are provided for injection of the atomising fluid. The oil is injected atports 23 in the form of oil jets. A proportion of the recirculating mixture will emerge from themixing chamber 15 through the interstices between these oil jets and will pass out through theexit ports 14 as a two-phase mixture which expands out of these ports to form a fine spray. - The
plenum chamber 22 andmixing chamber 15 are formed as gaps between thecap member 16 and themain body member 10. The shaping of thesemembers plenum chamber 22, there need not be equal numbers ofducts 21 andports 23 and they do not have to be accurately aligned on assembly. - The
exit ports 14 have their axes defining a cone, the axis of this cone being aligned with the longitudinal axis of the burner and the apex of the cone being on that longitudinal axis. The oil spray from the plurality ofexit ports 14 thus is in the general form of a hollow cone. In themixing chamber 15 the atomising fluid is injected through ports on the opposite wall of the chamber, that is the wall facing the exit ports. This wall is conical. It is not necessary in this construction however that thecap member 16 is angularly aligned with respect to thebody element 10. Alignment of the injection ports and exit ports is not critical and, in the particular embodiment illustrated, there are two rows ofinjection ports 13 and one row ofexit ports 14. The fluid entering the exit ports is well mixed in the mixing chamber and is forced into the exit ports. This construction gives good atomisation. - The simple construction having a
cap 16 screwed onto thebody member 10 enables the atomiser to be easily cleaned after these parts are separated. - In the above-described embodiment, the
exit ports 14 are evenly spaced with their axes lying on the same cone. In some cases, however, it may be advantageous to have these exit ports on more than one cone. Theports 14 need not necessarily be evenly spaced; they may be irregularly spaced or grouped. - In Figures 1 and 2, the atomising fluid ports are directly opposite and pointing towards the exit ports. Figure 3 illustrates a modification of that construction and the same reference characters are used to indicate corresponding components. In Figure 3 the atomising fluid inlets to the mixing chamber, as shown at 30, produce atomising fluid jets which tend to counter the toroidal circulation produced by the
oil jets 23. This may be advantageous in some cases to enhance mixing with the oil. In this construction, because the inlets to the atomisingfluid ports 30 are at a greater distance from the atomiser axis than in the arrangement of Figures 1 and 2, it is easier to provide the requisite number of ports. - In the constructions of Figures 1, 2 and 3, the atomising fluid is fed axially through a
central passage 11 in themain burner body 10. In some cases, as shown in Figures 4 and 5, it may be preferred to reverse the position of the oil and atomising fluid feeds, the oil feed being axially through a passage 41 and the atomising fluid being from anannular region 42 around the outside of thebody member 10. This arrangement makes the incorporation of sufficient atomising fluid port area much easier by locating these ports as far as possible from the atomiser axis. The fact that the oil ports shown at 43 in Figure 4 are now much closer to the axis is not too much of an imposition because the total oil port area is generally significantly less than the total atomising fluid port area. - Figure 5 illustrates a modification of Figure 4 in which the oil ports, shown at 50, are approximately parallel to the atomiser axis. The mixing chamberwall is shaped to direct the oil jets across the approach region to the exit ports. This arrangement may simplify manufacture.
Claims (10)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP82302010A EP0092002B1 (en) | 1982-04-20 | 1982-04-20 | Fuel atomisers for oil burners |
AT82302010T ATE17030T1 (en) | 1982-04-20 | 1982-04-20 | FUEL ATOMIZER FOR OIL BURNER. |
DE8282302010T DE3267989D1 (en) | 1982-04-20 | 1982-04-20 | Fuel atomisers for oil burners |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP82302010A EP0092002B1 (en) | 1982-04-20 | 1982-04-20 | Fuel atomisers for oil burners |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0092002A1 EP0092002A1 (en) | 1983-10-26 |
EP0092002B1 true EP0092002B1 (en) | 1985-12-18 |
Family
ID=8189639
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP82302010A Expired EP0092002B1 (en) | 1982-04-20 | 1982-04-20 | Fuel atomisers for oil burners |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0092002B1 (en) |
AT (1) | ATE17030T1 (en) |
DE (1) | DE3267989D1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60126511A (en) * | 1983-12-09 | 1985-07-06 | Haruji Kurogo | Burner tip device for acceleration of vaporizing and improvement of burning |
EP0268702B1 (en) * | 1986-11-27 | 1990-03-28 | Fluidics Instruments B.V. | Compressed-air atomizer nozzle |
EP0278115B1 (en) * | 1987-02-13 | 1990-04-11 | BBC Brown Boveri AG | Spray nozzle |
GB8905835D0 (en) * | 1989-03-14 | 1989-04-26 | British Petroleum Co Plc | Spray nozzle |
JP2537411B2 (en) * | 1989-09-20 | 1996-09-25 | 日本石油株式会社 | Burner for liquid fuel combustion |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1785802A (en) * | 1923-11-16 | 1930-12-23 | Adams Henry | Atomizing jet nozzle |
US1785804A (en) * | 1924-06-17 | 1930-12-23 | Adams Henry | Process for oil burning |
GB1424191A (en) * | 1972-01-15 | 1976-02-11 | Secr Defence | Fuel burning apparatus |
FR2288940A1 (en) * | 1974-10-24 | 1976-05-21 | Pillard Chauffage | IMPROVEMENTS TO LIQUID FUEL BURNERS SPRAYED BY THE RELIEF OF AN AUXILIARY FLUID AND METHOD OF USING THE latter |
GB1470671A (en) * | 1975-07-07 | 1977-04-21 | Central Electr Generat Board | Oil fuel atomisers for boilers |
US4141505A (en) * | 1976-06-07 | 1979-02-27 | Reich Richard B | Heavy fuel oil nozzle |
-
1982
- 1982-04-20 DE DE8282302010T patent/DE3267989D1/en not_active Expired
- 1982-04-20 AT AT82302010T patent/ATE17030T1/en not_active IP Right Cessation
- 1982-04-20 EP EP82302010A patent/EP0092002B1/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
EP0092002A1 (en) | 1983-10-26 |
ATE17030T1 (en) | 1986-01-15 |
DE3267989D1 (en) | 1986-01-30 |
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