EP0268432B1 - An atomizing nozzle assembly - Google Patents
An atomizing nozzle assembly Download PDFInfo
- Publication number
- EP0268432B1 EP0268432B1 EP87310020A EP87310020A EP0268432B1 EP 0268432 B1 EP0268432 B1 EP 0268432B1 EP 87310020 A EP87310020 A EP 87310020A EP 87310020 A EP87310020 A EP 87310020A EP 0268432 B1 EP0268432 B1 EP 0268432B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cylindrical sleeve
- deflector core
- deflector
- mixing zone
- atomizing
- 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 - Lifetime
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D1/00—Burners for combustion of pulverulent fuel
- F23D1/005—Burners for combustion of pulverulent fuel burning a mixture of pulverulent fuel delivered as a slurry, i.e. comprising a carrying liquid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/40—Static mixers
- B01F25/46—Homogenising or emulsifying nozzles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/02—Spray pistols; Apparatus for discharge
- B05B7/04—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge
- B05B7/0416—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2211/00—Thermal dilatation prevention or compensation
Definitions
- This invention relates to an atomizing nozzle assembly.
- the core is mounted in a flared socket of a deflector core holder and inner and outer sleeves feed, say, atomizing air to the deflector core surface and, say, a coal liquid mixture fuel inwardly around the nozzle rim so that the fuel is held by the air as a film against the nozzle rim inner surface and then atomized as it emerges from the nozzle rim.
- an atomizing nozzle assembly comprising:
- the adjustment means is capable of adjusting the width of the mixing zone to an L to W range ratio which is within the range of about. 5:1 to about 10:1, preferably 7:1 to 8:1, where L is the length of the mixing zone in the direction of flow therethrough and W is the width of the mixing zone.
- the face forming the chamfered extremity of the deflector core, and a downstream side face of the nozzle rim are symmetrically inclined, at any circumferential position, with respect to a centerline extending along the mixing zone at that circumferential position, at an included angle ( ⁇ °) in the ratio with respect to the angle ( ⁇ °), at which the atomizing fluid is directed towards the outwardly diverging surface of the deflector core of about 130° : 50° to about 100° : 80°.
- the adjustment means may comprise a shaft for rotating the deflector core and extending rearwardly therefrom along the inner cylindrical sleeve, a gland slidably mounting a rear end portion of the shaft, which extends therethrough, in the inner cylindrical sleeve, means for rotating the rear end of the shaft.
- a heat exchange may be provided around the outer cylindrical sleeve and mounted therearound at a front end by the said mounting means, and a differential thermal expansion accommodating gland slidably mounting a rear end portion of the heat exchange casing on the outer cylindrical sleeve.
- an atomizing nozzle assembly comprising:
- the deflector core 1 has a bore 76 in which a spigot 78 of the cap 32 is located, and the head of the bolt 34 is countersunk in the cap 32 to be flush therewith.
- the nozzle rim 8 is located in a retaining ring 80 which is welded in a locating sleeve 82.
- the locating sleeve 82 whose inner surface 84 forms a part of the boundary of the liquid passage 56, is secured in the stepped, annular recessed portion 52 by the threaded collar 58.
- the deflector core holder 20 has a recess 86 in which the shaft 64 is secured by means of a pin 88.
- the collar 50 of the inner sleeve 36 is located in a recess 90 in the outer sleeve 48 and has annular rings 92 and 94 locating the tubes 68 and 72 respectively which are welded in position.
- the outer sleeve 48 has a step 96 locating an outer, cylindrical casing 98 which is welded to the outer sleeve 48.
- the casing 98 supports and seals the upstream rear end portion of the tube 72 in a relatively slidable manner by means of a packing gland 100, and forms a heat exchange casing with a heat exchange fluid inlet 102 and outlet 104.
- the heat exchange fluid may be coolant water, for cooling the nozzle assembly, or steam for heating the liquid-to-be-atomized (e.g. a coal slurry fuel) for lowering its viscosity, and the packing gland 100 accommodates differential thermal expansion between the tube 72 and the casing 98.
- the tube 72 is sealed around a rear end portion of the tube 68 in a relatively slidable manner by the differential thermal expansion accommodating gland 106, which is a packing gland, and has an inlet 108 for liquid-to-be-atomized.
- the differential thermal expansion accommodating gland 106 which is a packing gland, and has an inlet 108 for liquid-to-be-atomized.
- the tube 68 is sealed in a slidable manner around a rear end portion of the shaft 64 by a gland 110 and has an atomizing fluid inlet 112.
- FIG. 1 and 2 The apparatus shown in Figures 1 and 2 was primarily designed for use in tests as a liquid mixture fuel atomizer and will be described, in operation, atomizing a de-ashed, pulverized coal liquid mixture fuel using the atomizing air of a conventional oil burner assembly (not shown) where secondary, combustion air is swirled around the atomized fuel.
- atomizing air is fed along the bore of the tube 64, through the ports, such as port 70, to the fluid passage 46 from which it is directed as a jet in an unobstructed manner through the mixing zone 16 along the surface 6 of the deflector core 1.
- the pulverized coal liquid mixture fuel is fed along the bore of the tube 72 through the ports, such as port 74, to the liquid passage 56 from which it is directed along the mixing zone 16.
- the jet of air from the fluid passage 46, flowing along the surface 6 of the deflector core 1 causes the pulverized coal liquid mixture to initially be held as a hollow cone-shaped film against the flared inner surface 14 of the nozzle rim 8 so that there is negligible contact between the fuel and the deflector core.
- the cone-shaped film of fuel travels along the mixing zone 16 it is thoroughly mixed with the air and emerges from the mixing zone 16 as an atomized jet.
- the width W ( Figure 2) of the mixing zone 16 can be adjusted while the nozzle assembly is in use by means of the barrel 66 and the screw threaded engagement between the deflector core holder 20 and the inner cylindrical sleeve 36.
- the nozzle rim 8 had a minimum inside diameter of 2.25 inches (57.15 mm) and a maximum inside diameter in the downstream direction of 2.539 inches (64.49 mm).
- the deflector core 1 had a maximum diameter of 2.460 inches (62.48 mm) at the outlet of the mixing zone 16.
- the mixing zone 16 had a nominal width (W) of .035 inches and the length/width (L/W, Figure 2) ratio was varied between 7 and 12.
Description
- This invention relates to an atomizing nozzle assembly.
- It has already been proposed in United States Patent No. 4,592,506, dated June 3, 1986, "Wear Resistant Nozzle Assembly", C.E. Capes, A.J. Bennett, K.A. Jonasson and W.L. Thayer, to provide a wear resistant nozzle assembly having an outwardly diverging frustum of a cone shaped deflector core of wear resistant ceramic and a nozzle rim of wear resistant ceramic and having an outwardly flared inner surface encircling the core to form a flared, atomizing nozzle orifice therewith. The core is mounted in a flared socket of a deflector core holder and inner and outer sleeves feed, say, atomizing air to the deflector core surface and, say, a coal liquid mixture fuel inwardly around the nozzle rim so that the fuel is held by the air as a film against the nozzle rim inner surface and then atomized as it emerges from the nozzle rim.
- It has already been proposed by the applicants in the Proceedings of the Fifth International Workshop on Coal-Liquids Fuels Technology, pages 364 to 378, held at Halifax, Nova Scotia, Canada, October, 1985, to provide a burner assembly for coal liquid mixtures wherein the geometry of an abruptly terminating mixing zone is adjusted by means of a screw threaded engagement at the upstream end of coaxial tubes which deliver the atomizing air and fuel to the nozzle at the downstream ends of these tubes.
- While the burner assemblies disclosed in United States Patent No. 4,592,506 and at the above mentioned workshop are useful, there is a need for an atomizing nozzle assembly wherein an adjusting mechanism mounts the deflector core to the nozzle rim in close proximity to the mixing zone, and means are provided for accommodating differential thermal expansions between members attached to, and for delivering fluids to the mixing zone between, the deflector core and nozzle rim, and extending rearwardly from the adjustment mechanism, in order that the effects of these differential expansions on the nozzle setting are negligible giving substantially constant atomization, and damage to the ceramic nozzle parts due to these differential thermal expansions is avoided.
- According to the present invention there is provided an atomizing nozzle assembly comprising:
- a) a frustum of a cone shaped, deflector core of a wear resistant ceramic material, said deflector having an outwardly diverging surface leading to a chamfered extremity, in a downstream direction for liquid-to-be-atomized, an outer portion of the diverging surface of the deflector core forming an outwardly deflecting surface for, in operation, an atomizing fluid jet to flow in an unobstructed manner along the whole length thereof,
- b) a nozzle rim of a wear resistant ceramic material, the rim having a wedge-shaped inward protrusion with a downstream side of the wedge shape protrusion having an outwardly flared, inner surface which is substantially parallel to, and co-extensive with, a downstream portion of the outwardly diverging surface of the deflector core to form therewith a mixing zone leading to an atomizing nozzle orifice outlet so that, in operation, liquid-to-be-atomized will be held against the surfaces bounding the mixing zone, until it is substantially completely mixed, and atomized as it emerges from the orifice outlet,
- c) a deflector core holder having a screw threaded upstream end and a flared socket portion at a downstream end, the flared socket portion having an outer, cylindrically shaped extremity, the flared socket having an upstream portion of the deflector core closely fitting and aligned therein, the flared socket portion, in operation, providing a smooth outer surface for guiding atomizing fluid towards and along the outwardly deflecting suface of the outer portion of the deflector core protruding from the flared socket portion,
- d) securing means securing the deflector core in the flared socket portion,
- e) an inner, cylindrical sleeve having a screw threaded, inner, upstream end portion which is in close proximity to the mixing zone and is in threaded engagement in an adjustable manner, with the screw threaded, upstream end portion of the deflector core holder and having a downstream end portion with an enlarged bore and terminating at a downstream end having inner and outer chamfers, the downstream end portion being around the flared socket portion to form a fluid passage around the cylindrically shaped extremity of the deflector core holder having a substantially constant cross-sectional area for, in operation, passing a substantially constant stream of atomizing fluid therealong to an atomizing fluid orifice formed between the inner chamfer and the outer deflecting surface of the flared socket so that, in operation, a jet of the atomizing fluid will issue from the atomizing fluid orifice and be directed along the outer portion of the outwardly deflecting surface of the deflector core,
- f) an upstream collar forming a mounting means on the front end of the inner cylindrical sleeve,
- g) an outer, cylindrical sleeve sealed and secured against relative movement by the upstream collar on the front end of the inner sleeve and having a stepped, annular recessed portion at the downstream end with the nozzle rim mounted therein and protruding radially inwardly therefrom, a portion of the outer sleeve having a relatively larger bore diameter than the outside diameter of the inner sleeve and forming therearound an unobstructed, liquid passage having a cross-sectional area for, in operation, conveying liquid-to-be-atomized at a predetermined mass flow rate towards the upstream side of, and inwardly around, the wedge-shaped protrusion of the nozzle rim,
- h) means securing the nozzle rim in the stepped, annular recessed portion,
- i) an adjustment means connected to the deflector core holder for adjusting the screw threaded engagement between the deflector core holder and the inner cylindrical sleeve to thereby adjust the width (W) of the mixing zone,
- j) means for delivering atomizing fluid to the fluid passage,
- k) means for delivering liquid-to-be-atomized to the liquid-to-be-atomized passage, and
- l) a differential thermal expansion accommodating gland slidably mounting an intermediate portion of the inner, cylindrical sleeve in a rear end portion of the outer, cylindrical sleeve.
- In some embodiments of the present invention the adjustment means is capable of adjusting the width of the mixing zone to an L to W range ratio which is within the range of about. 5:1 to about 10:1, preferably 7:1 to 8:1, where L is the length of the mixing zone in the direction of flow therethrough and W is the width of the mixing zone.
- In other embodiments of the present invention the face forming the chamfered extremity of the deflector core, and a downstream side face of the nozzle rim, are symmetrically inclined, at any circumferential position, with respect to a centerline extending along the mixing zone at that circumferential position, at an included angle (α°) in the ratio with respect to the angle (ϑ°), at which the atomizing fluid is directed towards the outwardly diverging surface of the deflector core of about 130° : 50° to about 100° : 80°.
- The adjustment means may comprise a shaft for rotating the deflector core and extending rearwardly therefrom along the inner cylindrical sleeve, a gland slidably mounting a rear end portion of the shaft, which extends therethrough, in the inner cylindrical sleeve, means for rotating the rear end of the shaft.
- A heat exchange may be provided around the outer cylindrical sleeve and mounted therearound at a front end by the said mounting means, and a differential thermal expansion accommodating gland slidably mounting a rear end portion of the heat exchange casing on the outer cylindrical sleeve.
- In the accompanying drawings which illustrate, by way of example, an embodiment of the present invention,
- Figure 1 is a sectional side view of an atomizing nozzle, and
- Figure 2 is an enlarged sectional side view of the nozzle components of the nozzle assembly shown in Figure 1.
- Referring now to Figures 1 and 2 there is shown an atomizing nozzle assembly comprising:
- a) a frustum of a cone shaped, deflector core 1 of a wear resistant ceramic material, said deflector having an outwardly diverging
surface 2 leading to achamfered extremity 4, in a downstream direction for liquid-to-be-atomized, an outer portion 5 of the diverging surface of the deflector core forming an outwardly deflecting surface 6 for, in operation, an atomizing fluid jet to flow in an unobstructed manner along the whole length thereof. - b) a
nozzle rim 8 of a wear resistant ceramic material, the rim having a wedge-shaped inward protrusion 10 with adownstream side 12 of the wedge-shaped protrusion 10 having an outwardly flared, inner surface 14 which is substantially parallel to, and co-extensive with, a downstream portion of the outwardly divergingsurface 2 of the deflector core 1 to form therewith amixing zone 16 leading to an atomizing nozzle orifice outlet 18 so that, in operation, liquid-to-be-atomized will be held against thesurfaces 2 and 14 bounding themixing zone 16, until it is substantially completely mixed, and then atomized as it emerges from the orifice outlet 18, - c) a deflector core holder 20 having a screw threaded
upstream end portion 22 and a flaredsocket portion 24 at a downstream end, the flaredsocket portion 24 having an outer, cylindrically shapedextremity 26, the flaredsocket portion 24 having an upstream portion 28 of the deflector core 1 closely fitting and aligned therein, the flaredsocket portion 24, in operation, providing a smoothouter surface 24 for guiding atomizing fluid towards and along the outwardly deflecting surface 6 of the outer portion 5 of the deflector core 1 protruding from the flaredsocket portion 24, - d) securing means in the form of a cap 32 and bolt 34 securing the deflector core 1 in the
flared socket portion 24, - e) an inner,
cylindrical sleeve 36 having a screw threaded, inner, upstream end portion 38 in threaded engagement in an adjustable manner, with the screw threaded,upstream end portion 22 of the deflector core holder 20 and having adownstream end portion 40 with an enlarged bore and terminating at a downstream end having inner andouter chamfers downstream end portion 46 being around theflared socket portion 24 to form afluid passage 46 around the cylindricallyshaped extremity 26 of the deflector core holder 20 for, in operation, passing a substantially constant stream of atomizing air therealong to an atomizing fluid orifice formed between theinner chamfer 42 and the outer deflecting surface 6 of the flared socket so that, in operation, a jet of the atomizing fluid will issue from the atomizing fluid orifice and be directed along the outer portion 5 of the outwardly deflecting surface of the deflector core 1, - f) an
upstream collar 50 forming a mounting means on the front end of the inner,cylindrical sleeve 36, - g) an outer,
cylindrical sleeve 48 sealed on, and secured against relative movement by theupstream collar 50 on the front end of theinner sleeve 36 and having a stepped, annularrecessed portion 52 at the downstream end with thenozzle rim 8 mounted therein and protruding radially inwardly therefrom, a portion 54 of theouter sleeve 48 having a relatively larger bore diameter than the outside diameter of theinner sleeve 36 and forming therearound an unobstructed,liquid passage 56 for, in operation, conveying liquid-to-be-atomized towards the upstream side of, and inwardly around, the wedge-shaped protrusion 10 of thenozzle rim 8, - h) means, in the form of a threaded
collar 58, securing thenozzle rim 8 in the stepped, annularrecessed portion 52, - i) an adjustment means, in the form of
shaft 64 and barrel 66 (Figure 1), connected to the deflector core holder 20 for adjusting the screw threaded engagement between the deflector core holder 20 and the innercylindrical sleeve 36 to thereby adjust the width (W) of the mixing zone, - j) means, in the form of a
tube 68, forming in this embodiment an intermediate portion of thecylindrical sleeve 36, and ports such as port 70, for delivering atomizing fluid to thefluid passage 46, - k) means, in the form of
tube 72, forming in this embodiment a rear end portion of the outer, cylindrical sleeve 49, and ports such asport 74 in thecollar 50, for delivering liquid-to-be-atomized to the liquid-to-be-atomized passage, and - l) a differential thermal
expansion accommodating gland 106 slidably mounting theintermediate portion 68 of the inner,cylindrical sleeve 36 in therear end portion 72 of the outer,cylindrical sleeve 48. - The deflector core 1 has a
bore 76 in which aspigot 78 of the cap 32 is located, and the head of the bolt 34 is countersunk in the cap 32 to be flush therewith. - The
nozzle rim 8 is located in aretaining ring 80 which is welded in a locatingsleeve 82. The locatingsleeve 82, whoseinner surface 84 forms a part of the boundary of theliquid passage 56, is secured in the stepped, annularrecessed portion 52 by the threadedcollar 58. - The deflector core holder 20 has a
recess 86 in which theshaft 64 is secured by means of apin 88. - The
collar 50 of theinner sleeve 36 is located in a recess 90 in theouter sleeve 48 and hasannular rings 92 and 94 locating thetubes - The
outer sleeve 48 has astep 96 locating an outer,cylindrical casing 98 which is welded to theouter sleeve 48. - As shown in Figure 1, the
casing 98 supports and seals the upstream rear end portion of thetube 72 in a relatively slidable manner by means of apacking gland 100, and forms a heat exchange casing with a heatexchange fluid inlet 102 andoutlet 104. The heat exchange fluid may be coolant water, for cooling the nozzle assembly, or steam for heating the liquid-to-be-atomized (e.g. a coal slurry fuel) for lowering its viscosity, and thepacking gland 100 accommodates differential thermal expansion between thetube 72 and thecasing 98. - As previously stated, the
tube 72 is sealed around a rear end portion of thetube 68 in a relatively slidable manner by the differential thermalexpansion accommodating gland 106, which is a packing gland, and has aninlet 108 for liquid-to-be-atomized. - The
tube 68 is sealed in a slidable manner around a rear end portion of theshaft 64 by agland 110 and has an atomizingfluid inlet 112. - The apparatus shown in Figures 1 and 2 was primarily designed for use in tests as a liquid mixture fuel atomizer and will be described, in operation, atomizing a de-ashed, pulverized coal liquid mixture fuel using the atomizing air of a conventional oil burner assembly (not shown) where secondary, combustion air is swirled around the atomized fuel.
- In operation, with the apparatus arranged as shown in Figures 1 and 2, atomizing air is fed along the bore of the
tube 64, through the ports, such as port 70, to thefluid passage 46 from which it is directed as a jet in an unobstructed manner through themixing zone 16 along the surface 6 of the deflector core 1. At the same time the pulverized coal liquid mixture fuel is fed along the bore of thetube 72 through the ports, such asport 74, to theliquid passage 56 from which it is directed along themixing zone 16. - The jet of air from the
fluid passage 46, flowing along the surface 6 of the deflector core 1 causes the pulverized coal liquid mixture to initially be held as a hollow cone-shaped film against the flared inner surface 14 of thenozzle rim 8 so that there is negligible contact between the fuel and the deflector core. As the cone-shaped film of fuel travels along themixing zone 16 it is thoroughly mixed with the air and emerges from themixing zone 16 as an atomized jet. - The width W (Figure 2) of the
mixing zone 16 can be adjusted while the nozzle assembly is in use by means of thebarrel 66 and the screw threaded engagement between the deflector core holder 20 and the innercylindrical sleeve 36. - It should be noted that there is negligible change in the width W of the
mixing zone 16 due to differential thermal expansion because of the close proximity of the screw threaded engagement between the deflector core holder 20 and the innercylindrical sleeve 36 to themixing zone 16, and the fact that differential thermal expansions between theshaft 64,tubes casing 98 are accommodated by means of theglands - Tests using the nozzle shown in Figures 1 and 2, and coal-water fuel of 70 : 30 by weight ratio and No. 6 bunker oil fuel have been made to show the efficacy of nozzles according to the present invention.
- These tests were run in an existing oil fired utility.
- The
nozzle rim 8 had a minimum inside diameter of 2.25 inches (57.15 mm) and a maximum inside diameter in the downstream direction of 2.539 inches (64.49 mm). The deflector core 1 had a maximum diameter of 2.460 inches (62.48 mm) at the outlet of themixing zone 16. Themixing zone 16 had a nominal width (W) of .035 inches and the length/width (L/W, Figure 2) ratio was varied between 7 and 12. - These tests demonstrated the ability of atomizing nozzles according to the present invention to atomize coal slurry fuels which have been difficult to atomize by known atomizing nozzles. The good atomization of these fuels by atomizing nozzles according to the present invention is demonstrated by the clean, recirculated flames that are obtained with little fall out due to incomplete combustion.
- From the tests it was found that with a fuel comprising 70 : 30 by weight ratio coal : water and an L : W ratio of 7 : 1, a carbon conversion of >99.5% was found to occur by analyzing the flue gas ash content whereas the carbon conversion under similar conditions for known atomizing nozzles was 96.2%.
- The tests showed that with the applicants' combination of:
- i) an inner, cylindrical sleeve having a screw threaded, inner upstream end portion, which is in close proximity to the mixing zone and is in threaded engagement in an adjustable manner with the screw threaded, upstream end of the deflector core holder;
- ii) an upstream collar forming a mounting means on the front end of the inner, cylindrical sleeve for the outer cylindrical sleeve; and
- iii) a differential thermal expansion accommodating gland slidably mounting an intermediate portion of the inner, cylindrical sleeve in a rear end portion of the outer, cylindrical sleeve;
Claims (6)
- An atomizing nozzle assembly comprising:a) a frustum of a cone shaped, deflector core of a wear resistant ceramic material, said deflector having an outwardly diverging surface leading to a chamfered extremity, in a downstream direction for liquid-to-be-atomized, an outer portion of the diverging surface of the deflector core forming an outwardly deflecting surface for, in operation, an atomizing fluid jet to flow in an unobstructed manner along the whole length thereof,b) a nozzle rim of a wear resistant ceramic material, the rim having a wedge-shaped inward protrusion with a downstream side of the wedge-shaped protrusion having an outwardly flared, inner surface which is substantially parallel to, and co-extensive with, a downstream portion of the outwardly diverging surface of the deflector core to form therewith a mixing zone leading to an atomizing nozzle orifice outlet so that, in operation, liquid-to-be-atomized will be held against the surfaces bounding the mixing zone, until it is substantially completely mixed, and atomized as it emerges from the orifice outlet,c) a deflector core holder having a screw threaded upstream end and a flared socket portion at a downstream end, the flared socket portion having an outer, cylindrically shaped extremity, the flared socket having an upstream portion of the deflector core closely fitting and aligned therein, the flared socket portion, in operation, providing a smooth outer surface for guiding atomizing fluid towards and along the outwardly deflecting surface of the outer portion of the deflector core protruding from the flared socket portion,d) securing means securing the deflector core in the flared socket portion,e) an inner, cylindrical sleeve having a screw threaded, inner, upstream end portion, which is in close proximity to the mixing zone and is in threaded engagement in an adjustable manner with the screw threaded, upstream end portion of the deflector core holder, the inner cylindrical sleeve having a downstream end portion with an enlarged bore and terminating at a downstream end having inner and outer chamfers, the downstream end portion being around the flared socket portion to form a fluid passage around the cylindrically shaped extremity of the deflector core holder for, in operation, passing a substantially constant stream of atomizing fluid therealong to an atomizing fluid orifice formed between the inner chamfer and the outer deflecting surface of the flared socket so that, in operation, a jet of the atomizing fluid will issue from the atomizing fluid orifice and be directed along the outer portion of the outwardly deflecting surface of the deflector core,f) an upstream collar forming a mounting means on the front end of the inner, cylindrical sleeve,g) an outer, cylindrical sleeve sealed on, and secured against relative movement by the upstream collar on the front end of the inner sleeve and having a stepped, annular recessed portion at the downstream end with the nozzle rim mounted therein and protruding radially inwardly therefrom, a portion of the outer sleeve having a relatively larger bore diameter than the outside diameter of the inner sleeve and forming therearound an unobstructed, liquid passage for, in operation, conveying liquid-to-be-atomized towards the upstream side of, and inwardly around, the wedge-shaped protrusion of the nozzle rim,h) means securing the nozzle rim in the stepped, annular recessed portion,i) an adjustment means connected to the deflector core holder for adjusting the screw threaded engagement between the deflector core holder and the inner cylindrical sleeve to thereby adjust the width (W) of the mixing zone,j) means for delivering atomizing fluid to the fluid passage,k) means for delivering liquid-to-be-atomized to the liquid-to-be-atomized passage, andl) a differential thermal expansion accommodating gland slidably mounting an intermediate portion of the inner, cylindrical sleeve in a rear end portion of the outer cylindrical sleeve.
- A nozzle assembly according to claim 1, wherein the adjustment means is capable of adjusting the width of the mixing zone to an L to W range ratio which is within the range of about 5 : 1 to about 10 : 1, where L is the length of the mixing zone in the direction of flow therethrough and W is the width of the mixing zone.
- A nozzle assembly according to claim 2, wherein the L to W range ratio is within the range of about 7 : 1 to about 8 : 1.
- A nozzle assembly according to claim 1, wherein the face forming the chamfered extremity of the deflector core, and a downstream side face of the nozzle rim, are symmetrically inclined, at any circumferential position, with respect to a centerline extending along the mixing zone at that circumferential position, at an included angle (α°) in the ratio with respect to the angle (0°), at which the atomizing fluid is directed towards the outwardly diverging surface of the deflector core of about 130° : 50° to about 100° : 80°.
- A nozzle assembly according to claim 1, wherein the adjustment means comprises, a shaft for rotating the deflector core and extending rearwardly therefrom along the inner cylindrical sleeve, a gland slidably mounting a rear end portion of the shaft, which extends therethrough, in the inner cylindrical sleeve, means for rotating the rear end of the shaft.
- A nozzle assembly according to claim 1, further comprising a heat exchange casing around the outer cylindrical sleeve and mounted therearound at a front end at the said mounting means, and a differential thermal expansion accommodating gland slidably mounting a rear end portion of the heat exchange casing on a rear end portion of the outer cylindrical sleeve.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA000522934A CA1277585C (en) | 1986-11-13 | 1986-11-13 | Atomizing nozzle assembly |
CA522934 | 1986-11-13 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0268432A2 EP0268432A2 (en) | 1988-05-25 |
EP0268432A3 EP0268432A3 (en) | 1990-01-31 |
EP0268432B1 true EP0268432B1 (en) | 1992-08-05 |
Family
ID=4134342
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP87310020A Expired - Lifetime EP0268432B1 (en) | 1986-11-13 | 1987-11-12 | An atomizing nozzle assembly |
Country Status (4)
Country | Link |
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EP (1) | EP0268432B1 (en) |
JP (1) | JPS6488019A (en) |
CA (1) | CA1277585C (en) |
DE (1) | DE3780916T2 (en) |
Families Citing this family (6)
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CN201218499Y (en) * | 2007-08-06 | 2009-04-08 | 国际壳牌研究有限公司 | Burner |
CN201228965Y (en) | 2007-08-06 | 2009-04-29 | 国际壳牌研究有限公司 | Combustor |
CN101363626B (en) | 2007-08-06 | 2015-05-20 | 国际壳牌研究有限公司 | Method of manufacturing a burner front face |
US8070483B2 (en) | 2007-11-28 | 2011-12-06 | Shell Oil Company | Burner with atomizer |
JP5525989B2 (en) * | 2010-10-05 | 2014-06-18 | ダイニチ工業株式会社 | Vaporizer |
CN113522550A (en) * | 2021-08-12 | 2021-10-22 | 蔡艳华 | Atomizing nozzle for producing coal water slurry |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0128805A3 (en) * | 1983-06-03 | 1986-02-19 | Forney Engineering Company | Twin fluid atomizer |
CA1209182A (en) * | 1984-01-04 | 1986-08-05 | Charles E. Capes | Wear resistant atomizing nozzle assembly |
DD249612A3 (en) * | 1985-05-14 | 1987-09-16 | Stroemungsmasch Veb | LIQUID BURNER WITH STEAM PRESSURE SCREENING |
-
1986
- 1986-11-13 CA CA000522934A patent/CA1277585C/en not_active Expired - Lifetime
-
1987
- 1987-11-12 JP JP62286419A patent/JPS6488019A/en active Granted
- 1987-11-12 EP EP87310020A patent/EP0268432B1/en not_active Expired - Lifetime
- 1987-11-12 DE DE8787310020T patent/DE3780916T2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
EP0268432A2 (en) | 1988-05-25 |
JPH0325690B2 (en) | 1991-04-08 |
JPS6488019A (en) | 1989-04-03 |
DE3780916D1 (en) | 1992-09-10 |
DE3780916T2 (en) | 1993-03-25 |
EP0268432A3 (en) | 1990-01-31 |
CA1277585C (en) | 1990-12-11 |
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