NL1040268C2 - Retractable injection lance for finely dispersing liquids in gas streams. - Google Patents

Retractable injection lance for finely dispersing liquids in gas streams. Download PDF

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Publication number
NL1040268C2
NL1040268C2 NL1040268A NL1040268A NL1040268C2 NL 1040268 C2 NL1040268 C2 NL 1040268C2 NL 1040268 A NL1040268 A NL 1040268A NL 1040268 A NL1040268 A NL 1040268A NL 1040268 C2 NL1040268 C2 NL 1040268C2
Authority
NL
Netherlands
Prior art keywords
tube
liquid
internal parts
axes
fine
Prior art date
Application number
NL1040268A
Other languages
Dutch (nl)
Inventor
Hendrik Pieter Egbert Helle
Original Assignee
Corrosioncontrol Nu B V
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Corrosioncontrol Nu B V filed Critical Corrosioncontrol Nu B V
Priority to NL1040268A priority Critical patent/NL1040268C2/en
Priority to PCT/NL2014/050408 priority patent/WO2014204314A1/en
Application granted granted Critical
Publication of NL1040268C2 publication Critical patent/NL1040268C2/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/14—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with multiple outlet openings; with strainers in or outside the outlet opening
    • B05B1/20—Arrangements of several outlets along elongated bodies, e.g. perforated pipes or troughs, e.g. spray booms; Outlet elements therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/21—Mixing gases with liquids by introducing liquids into gaseous media
    • B01F23/213—Mixing gases with liquids by introducing liquids into gaseous media by spraying or atomising of the liquids
    • B01F23/2132—Mixing gases with liquids by introducing liquids into gaseous media by spraying or atomising of the liquids using nozzles
    • 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
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/313—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit
    • B01F25/3133—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit characterised by the specific design of the injector
    • B01F25/31331—Perforated, multi-opening, with a plurality of holes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/71—Feed mechanisms
    • B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
    • B01F35/71805—Feed mechanisms characterised by the means for feeding the components to the mixer using valves, gates, orifices or openings
    • B01F35/718051—Feed mechanisms characterised by the means for feeding the components to the mixer using valves, gates, orifices or openings being adjustable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/34—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl
    • B05B1/3405—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl to produce swirl
    • B05B1/341—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl to produce swirl before discharging the liquid or other fluent material, e.g. in a swirl chamber upstream the spray outlet
    • B05B1/3421—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl to produce swirl before discharging the liquid or other fluent material, e.g. in a swirl chamber upstream the spray outlet with channels emerging substantially tangentially in the swirl chamber

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Nozzles (AREA)

Abstract

An injection lance for dispersing liquids in gas streams under pressure through a multitude of orifices in a smooth tube of sufficient length for the application. The injection lance comprises of a tube with a plurality of spray orifices, one or more inserts with the function to guide the liquid stream to the spray orifices while imposing a swirling motion on the liquid. The inserts typically fit tightly in the tube and may be slightly radially expanded after assembly by axial compression for favorable tightness of fit. The axis of a swirl chamber is aligned with the axis of its corresponding spray orifice in the tube. The lance is retractable due to its uniform cross-section which allows its retraction from the medium under pressure through a nozzle with a full bore valve and a gland.

Description

Retractable injection lance for finely dispersing liquids in gas streams
Description
Field of the invention
The invention relates to the fine dispersion of liquids in gas flows, in particular where the nature of the service makes retractability of the injection and dispersion device, without the need for interruption or depressurization of the gas flow, a desirable feature.
Description of the related art
Retractable injection devices are believed to be already applied in the art. These devices are straight tubes with an open end commonly known as 'quills'. Alternatively, a tube with a single spray nozzle at its end can serve as a retractable dispersion device but its capacity is limited by the single nozzle. The open ended 'quills' have no intrinsic dispersion capacity which depends mainly on the velocity of the gas flow. Devices with a single spray nozzle have little flexibility in its spray characteristics and have a confined capacity range. US2001042797 describes a dispensing device for dispensing a curtain spray pattern of liquid through a tubular body having an open end and a closed end. The open end can be connected to a flexible hose or the like for supplying pressurized liquid to the tubular body which has a plurality of spaced openings along its length on one side. The openings can be in a single line or in a plurality of rows. Essentially, this describes a perforated tube. No claims are made with regard to internal parts that improve the dispersion.
Summary of the invention
When the purpose of injection of liquids into gas streams is to establish a physical or chemical interaction between the two phases a large interphase surface area between liquid and gas is beneficial in order to increase the physical or chemical reaction rate between the phases. This can only be achieved by establishing a fine dispersion of the liquid. A fine dispersion implies a small average droplet size which correlates with a large liquid surface area. Since the number of droplets for a given liquid volume increases with the third power of the reciprocal droplet diameter and the surface area of a droplet decreases with the second power of its diameter, there is an inverse correlation between average droplet size and total liquid surface area. Typically, small droplets are produced by high liquid shear stresses as may result from high flow velocities through small orifices. For any given mass flow rate finer dispersion is realized by a smaller orifice and a higher pressure. For any given mass flow rate at a given pressure a finer dispersion can be achieved by an increase of the number and a decrease of size of the orifices. For a given pressure and orifice size a finer dispersion can be realized when the liquid flow is rotating around the axis of the orifice while it flows towards the orifice. This configuration is a well established practice in the art. GB1516421A, for instance, claims a spray head on a spray-can that imposes a swirling motion on the liquid to improve dispersion. US2006/0249598A1 claims a spray head for liquids consisting of a spray orifice over a spray chamber fed through non-radial channels. Injection devices for liquids with a plurality of dispersion orifices either consists of a tube with holes or a tube with a plurality of externally attached spray nozzles. The former device produces a relatively coarse dispersion; the latter device is not retractable from a pressurized system without depressurization or considerable leakage of gas.
The present invention is a retractable spray lance for finely dispersing liquids in gas streams under pressure through a multitude of orifices in a smooth tube. Since the channels and spray chambers of the dispersion nozzle are situated inside the tube this leaves the outside of the tube smooth and of uniform cross-section. The spray lance is retractable without depressurization or significant loss of gas due to its uniform cross-section which allows its retraction from the medium under pressure through a nozzle with a full bore valve and a gland which fits sufficiently tight around the lance to seal but allows longitudinal movement.
The injection lance comprises a tube with a plurality of spray orifices, a plurality of inserts with the function to guide the liquid stream to the spray orifices while forcing the liquid in a circular 'swirl chamber' into a swirling motion around the axis of the orifice on its path towards the orifice. The inserts typically fit tightly in the tube and may be slightly radially expanded after assembly by axial compression. The inserts consist of a central channel, one or more swirl chambers and one or more conduits between the central channel and each swirl chamber, preferably configured so that the direction of flow enhances the momentum of the liquid in the swirl chamber. The axis of each swirl chamber is approximately aligned with the axis of the corresponding orifice in the tube. To secure the alignment, the inserts have a longitudinal groove or ridge which fits in a matching ridge or groove in the tube. The length of the inserts in their axially compressed state matches the distances between the orifices. By variation of liquid pressure level, tube size, channel size, swirl chamber size and orifice size different spray types may be generated. Variation of the numbers, the sizes and the positions of orifices may be applied to change the spray pattern and capacity of the injection lance.
Description of the drawings
The various features of the invention may be more readily understood with reference to the accompanying drawings wherein numbers designate the structural elements shown, in conjunction with their function described in the detailed description.
Figure 1 shows a cross-sectional view of the length of the injection lance with a multitude of inserts. Figure 2a shows a view of the cross-section of the tube and insert with grooves and a ridges.
Figure 2b shows a side view of an insert with a swirl-chamber and channels.
Figure 3a-c show cross-sectional views of possible orifices (11).
Description of the preferred embodiment
Referring to the drawings, figure 1 illustrates in a cross sectional view of the length of the injection lance having multiple orifices (11) and multiple inserts (20). The injection lance is comprised of two sections: a conduit section without orifices (15) and a dispersion section which is a tubular body (12) with a multitude of orifices (11) and one or more grooves (13) or ridges (14) or both for aligning the inserts (20). The two sections (12) and (15) can be machined from a single tube or be assembled from two separate components. The connection between the section (15) and the perforated tubular body (12) can be a screwed or welded connection. Optionally, an edge (17) that may support the first insert (20) is present. The other end of the tubular body (12) comprises a cap or plug (16) that seals off the end of the tubular body and optionally can be tightened to compress and laterally expand the inserts (20). The distances and orientations of the orifices (15) are such that they match the distances and orientations of the axes of the swirl chambers (22) in the inserts (20) in the functional state.
The figure 2a shows a cross section of an insert (20) with a central channel (21), swirl chambers (22) and conduits (25) between channel (21) and swirl chambers (22), which are configured in such a way that the liquid flow enters the swirl chambers tangentially. The figure also shows the ridges (23) and grooves (24) which mate with grooves (13) and ridges (14) for proper alignment. There is significant freedom in choosing the orientation of the swirl chambers relative to the ridges which allows a large variation of spray configurations to be created to match the specific requirements of an application. Figure 2b illustrates a possible configuration of conduits (25) to obtain a tangential flow in the swirl chamber.
Since the tightness of the fit of the inserts (20) in the tubular body (12) is an important factor for the fineness of the spray, the inserts should be made to narrow tolerances. Advantageously, and less costly than precise machining, the inserts (20) can be laterally expanded by longitudinal compression after they have been inserted in the tube, for instance by tightening of the threaded plug (16). In that case for insert (20), a material with a low elastic modulus is applied, for instance a plastic or an elastomer provided the material is suitable for the service conditions.
The figures 3 a,b,c illustrate some possible shapes of the orifices (11). When the wall of the tubular body 12 is very thin, a straight hole can be applied; for a thicker wall a conical shape is preferred.

Claims (9)

1. Inrichting voor het fijn vernevelen van een vloeistof in een onder positieve of negatieve gasdruk staande ruimte middels een buis (12) met een veelheid van sproeiopeningen (11) in de wand, met het kenmerk dat de buis (12) is voorzien van een van een veelheid van inwendige delen bestaande uit een centraal toevoer kanaal (21) verbonden middels zijkanalen (25) met een of meer wervelkamers (22) waarbij de tangentiële instroming in de wervelkamers een draaiende stroming doet ontstaan die versnelt naar de opening (11) in de buis en bij uittreden een fijne verneveling van de vloeistof bewerkstelligd.Device for fine atomization of a liquid in a space under positive or negative gas pressure by means of a tube (12) with a plurality of spray openings (11) in the wall, characterized in that the tube (12) is provided with a of a plurality of internal parts consisting of a central supply channel (21) connected by side channels (25) to one or more swirling chambers (22) wherein the tangential inflow into the swirling chambers produces a rotating flow that accelerates to the opening (11) in caused a fine atomization of the liquid upon leaving the tube. 2. Inrichting voor het fijn vernevelen van een vloeistof zoals beschreven in conclusie 1) met het kenmerk dat het uitwendig oppervlak van de buis glad is en vrij van uitstekende delen zodat de installatie uit de gasgevulde ruimte kan worden verwijderd zonder significante gaslekkage.Device for fine atomization of a liquid as described in claim 1), characterized in that the outer surface of the tube is smooth and free from projecting parts so that the installation can be removed from the gas-filled space without significant gas leakage. 3. Inrichting voor het fijn vernevelen van een vloeistof zoals beschreven in conclusie 1) met het kenmerk dat een systeem van een of meer passende longitudinale groeven en richels in de buis (12) en de inwendige delen (20) of andersom het mogelijk maken de inwendige delen zodanig te positioneren dat de assen van de wervelkamers radiaal in lijn liggen met de assen van de openingen.Device for fine atomizing a liquid as described in claim 1), characterized in that a system of one or more matching longitudinal grooves and ridges in the tube (12) and the internal parts (20) or vice versa makes it possible to position internal parts such that the axes of the swirl chambers are radially aligned with the axes of the openings. 4. Inrichting voor het fijn vernevelen van een vloeistof zoals beschreven in conclusie 3) met het kenmerk dat de radiale uitlijning van de assen van de wervelkamers (22) en de assen van de openingen (11) wordt bewerkstelligd door een combinatie van een groef in de buis en in de inwendige delen die met een passende draad of spie in de twee tegenover elkaar liggende groeven uitgelijnd worden.Device for fine atomizing a liquid as described in claim 3), characterized in that the radial alignment of the axes of the swirling chambers (22) and the axes of the openings (11) is effected by a combination of a groove in the tube and in the internal parts that are aligned with a suitable thread or key in the two opposite grooves. 5. Inrichting voor het fijn vernevelen van een vloeistof zoals beschreven in conclusie 3) met het kenmerk dat de uitlijning van de assen van de wervelkamers en de assen van de openingen in de buis wordt bewerkstelligd dooreen combinatie van corresponderende deuken of gaten en uitstulpingen in de delen.Device for fine atomization of a liquid as described in claim 3), characterized in that the alignment of the axes of the swirl chambers and the axes of the openings in the tube is effected by a combination of corresponding dents or holes and protrusions in the share. 6) ) Inrichting voor het fijn vernevelen van een vloeistof zoals beschreven in conclusie 1) met het kenmerk dat de inwendige delen na montage in de buis in lengterichting samengedrukt kunnen worden zodanig dat de laterale expansie een nauwe aansluiting van de inwendige delen in de buis bewerkstelligt hetgeen gunstig is voor de werking van de inrichting.6)) Device for fine atomizing a liquid as described in claim 1), characterized in that after mounting in the tube the internal parts can be compressed in the longitudinal direction such that the lateral expansion ensures a close connection of the internal parts in the tube which is favorable for the operation of the device. 7. Inrichting voor het fijn vernevelen van een vloeistof zoals beschreven in conclusie 6) met het kenmerk dat drukkracht op de inwendige delen wordt bewerkstelligd door het indraaien van de bout (16) naar de stootrand (17).Device for fine atomization of a liquid as described in claim 6), characterized in that compressive force on the internal parts is achieved by screwing in the bolt (16) to the bumper (17). 8. Inrichting voor het fijn vernevelen van een vloeistof zoals beschreven in conclusie 6) met het kenmerk dat drukkracht op de inwendige delen wordt tot stand wordt gebracht door het aanspannen van een of meer trekstangen door de inwendige delen.Device for fine atomization of a liquid as described in claim 6), characterized in that pressure force on the internal parts is created by tensioning one or more tie rods through the internal parts. 9. Inrichting voor het fijn vernevelen van een vloeistof zoals beschreven in conclusie 6) met het kenmerk dat de inwendige delen van een inwendige verstijving zijn voorzien teneinde het naar binnen knikken bij compressie te voorkomen.Device for fine atomization of a liquid as described in claim 6), characterized in that the internal parts are provided with an internal stiffening in order to prevent buckling in when compressed.
NL1040268A 2013-06-21 2013-06-21 Retractable injection lance for finely dispersing liquids in gas streams. NL1040268C2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
NL1040268A NL1040268C2 (en) 2013-06-21 2013-06-21 Retractable injection lance for finely dispersing liquids in gas streams.
PCT/NL2014/050408 WO2014204314A1 (en) 2013-06-21 2014-06-20 Retractable injection lance for finely dispersing liquids in gas streams

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1040268 2013-06-21
NL1040268A NL1040268C2 (en) 2013-06-21 2013-06-21 Retractable injection lance for finely dispersing liquids in gas streams.

Publications (1)

Publication Number Publication Date
NL1040268C2 true NL1040268C2 (en) 2014-12-24

Family

ID=51168318

Family Applications (1)

Application Number Title Priority Date Filing Date
NL1040268A NL1040268C2 (en) 2013-06-21 2013-06-21 Retractable injection lance for finely dispersing liquids in gas streams.

Country Status (2)

Country Link
NL (1) NL1040268C2 (en)
WO (1) WO2014204314A1 (en)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4036439A (en) 1975-09-24 1977-07-19 Newman-Green, Inc. Spray head for nebulization of fluids
US5277250A (en) 1992-09-30 1994-01-11 Nalco Chemical Company Injector quill
US20010042797A1 (en) 1998-12-31 2001-11-22 Shrigley Ross P. Water wand
US20040201142A1 (en) 2003-04-14 2004-10-14 Robert Rumen Injection lance for uniformly injecting a steam/ammonia mixture into a fossil fuel combustion stream
FR2858568B1 (en) 2003-08-08 2006-09-15 Valois Sas LIQUID SPRAY HEAD
WO2009021626A1 (en) * 2007-08-14 2009-02-19 Miele & Cie. Kg Dishwasher
US8028936B2 (en) * 2009-02-17 2011-10-04 Mcdermott Peter Spray nozzle

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Effective date: 20160701