EP2555858A1 - Système de pulvérisation et procédé pour pulvériser un fluide secondaire dans un fluide primaire - Google Patents

Système de pulvérisation et procédé pour pulvériser un fluide secondaire dans un fluide primaire

Info

Publication number
EP2555858A1
EP2555858A1 EP11713276A EP11713276A EP2555858A1 EP 2555858 A1 EP2555858 A1 EP 2555858A1 EP 11713276 A EP11713276 A EP 11713276A EP 11713276 A EP11713276 A EP 11713276A EP 2555858 A1 EP2555858 A1 EP 2555858A1
Authority
EP
European Patent Office
Prior art keywords
nozzle
fluid
spray
secondary fluid
primary fluid
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Withdrawn
Application number
EP11713276A
Other languages
German (de)
English (en)
Inventor
Stefan Hartig
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP2555858A1 publication Critical patent/EP2555858A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B5/00—Cleaning by methods involving the use of air flow or gas flow
    • B08B5/02—Cleaning by the force of jets, e.g. blowing-out cavities
    • 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
    • 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
    • B01F25/311—Injector mixers in conduits or tubes through which the main component flows for mixing more than two components; Devices specially adapted for generating foam
    • 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
    • B01F25/312—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof
    • 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
    • B01F25/312—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof
    • B01F25/3121—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof with additional mixing means other than injector mixers, e.g. screens, baffles or rotating elements
    • 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
    • B01F25/312—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof
    • B01F25/3124—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof characterised by the place of introduction of the main flow
    • B01F25/31243—Eductor or eductor-type venturi, i.e. the main flow being injected through the venturi with high speed in the form of a jet
    • 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
    • B01F35/10—Maintenance of mixers
    • B01F35/145—Washing or cleaning mixers not provided for in other groups in this subclass; Inhibiting build-up of material on machine parts using other means
    • B01F35/1452—Washing or cleaning mixers not provided for in other groups in this subclass; Inhibiting build-up of material on machine parts using other means using fluids
    • B01F35/1453—Washing or cleaning mixers not provided for in other groups in this subclass; Inhibiting build-up of material on machine parts using other means using fluids by means of jets of fluid, e.g. air
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
    • B05B15/50—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter
    • B05B15/52—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter for removal of clogging particles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
    • F04F5/02—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being liquid
    • F04F5/04—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being liquid displacing elastic fluids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
    • F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
    • F04F5/46—Arrangements of nozzles
    • F04F5/462—Arrangements of nozzles with provisions for cooling the fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
    • F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
    • F04F5/46—Arrangements of nozzles
    • F04F5/463—Arrangements of nozzles with provisions for mixing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
    • F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
    • F04F5/46—Arrangements of nozzles
    • F04F5/466—Arrangements of nozzles with a plurality of nozzles arranged in parallel
    • 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
    • B05B7/0075—Nozzle arrangements in gas streams
    • 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
    • B05B7/06—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane
    • B05B7/062—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet
    • 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
    • B05B7/06—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane
    • B05B7/062—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet
    • B05B7/065—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet an inner gas outlet being surrounded by an annular adjacent liquid outlet
    • 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
    • B05B7/06—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane
    • B05B7/062—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet
    • B05B7/066—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet with an inner liquid outlet surrounded by at least one annular gas outlet

Definitions

  • the invention relates to a spray system for spraying a secondary fluid into a primary fluid, wherein the secondary fluid is gaseous or liquid or contains fine particulate solids to be dispersed in the primary fluid, with at least one central nozzle for the primary fluid and at least one nozzle for Spraying the secondary fluid, wherein a nozzle housing of the nozzle is constructed tubular and the central nozzle has a central passageway for the primary fluid.
  • the task is to mix a secondary, liquid or gaseous fluid or fine particulate solids as homogeneously as possible in the primary fluid.
  • nozzles are used. Since the interference of the secondary fluid, to which we also want to count the particles suspended in fine particle form in a carrier fluid, is to take place within a very short running distance, a large number of nozzles is required, which cross the cross section of the - -
  • the secondary fluid is introduced into the primary fluid with the aid of a sputtering aid.
  • This sputtering assist medium may be, for example, compressed air or steam.
  • the primary gas flows through the edge zones of the spray jet toward the axis of the spray jet and, as a result of the flow resistance, also entrains drops toward the jet axis. Accordingly, there are unfavorable boundary conditions for the evaporation of the drops on the beam axis. Because the flue gas has already cooled down on the way to the axis of the spray and enriched with water vapor. Furthermore, very close to the beam axis usually high drop current densities, which is also very unfavorable for obvious reasons for rapid evaporation. - -
  • the spray system and the method should be such that the interference of the primary gas in the jet of secondary fluid is as intense as possible.
  • a central propulsion jet nozzle for a liquid jet opens within a mixing chamber to which a gas is supplied. Downstream of the mixing chamber, a divergent outlet part is provided.
  • German Patent DE 2134100 C2 discloses a combustion chamber feed device in which a convergent / divergent Venturi nozzle is arranged within a cylindrical chamber. An air jet nozzle opens into the inlet of the Venturi nozzle. Fuel gas is to be sucked in via the Venturi nozzle and then fed to a combustion chamber downstream of the chamber.
  • US Pat. No. 5,091,118 discloses a spray system for mixing oxygen into water.
  • the liquid is passed through a convergent / divergent passageway.
  • a central outlet opening for the gas is arranged within the passage channel.
  • the invention seeks to improve a spray system and method for injecting a secondary fluid into a primary fluid.
  • a spray system for injecting a secondary fluid into a primary fluid, the secondary fluid being gaseous or liquid or containing fine particulate solids to be dispersed in the primary fluid, having at least one central nozzle for the primary fluid and at least one nozzle for spraying the secondary fluid, wherein a nozzle housing of the nozzle constructed tubular and the central nozzle has a central passageway for the primary fluid, wherein the passageway seen in the flow direction has a convergent inlet area, a constriction and a divergent outlet part, wherein at least one outlet opening for the secondary fluid is disposed at the downstream end of the nozzle housing and wherein the at least one outlet port is formed and arranged to produce a spray of secondary fluid which is from the central one n passage channel exiting primary fluid substantially annular surrounds.
  • the primary fluid is not mixed exclusively into the secondary fluid via an outer circumference of the spray jet. Rather, the primary fluid is additionally fed via the central nozzle to the central region of the spray jet.
  • the at least one outlet opening is formed by means of a plurality of outlet openings for the secondary fluid, which are arranged annularly at the end of the nozzle housing.
  • each of the plurality of outlet openings for the secondary fluid is surrounded by an annular gap for a gaseous atomization auxiliary medium.
  • the at least one outlet opening is formed by means of a single annular gap arranged at the end of the nozzle housing.
  • the annular gap for the secondary fluid is arranged within an annular gap for a gaseous atomization auxiliary medium.
  • a swirl generator is arranged in the passage channel of the central nozzle.
  • At least one cleaning nozzle for keeping the inlet of deposits is provided at the upstream inlet of the passage channel of the central nozzle.
  • the nozzle housing of the at least one nozzle is arranged in a channel carrying the primary fluid.
  • the nozzle housing of the at least one nozzle spaced from a wall of the primary fluid-conducting channel is arranged.
  • the nozzle housing can be substantially completely flowed around by the primary fluid and at the same time, the primary fluid can pass through the passageway of the central nozzle.
  • the essentially annular spray steel of secondary fluid and atomization aid emerging at the end of the nozzle housing can - Are surrounded by both on its inside and its outside of primary fluid.
  • a channel leading parallel to the flow direction into the primary fluid is arranged with the longitudinal axis of the central nozzle.
  • the at least one nozzle and the central nozzle in the form of a propulsion jet pump are designed such that the primary fluid at the entrance of the passage channel of the central nozzle is sucked by the propellant effect of emerging from the at least one outlet opening for the secondary fluid, substantially annular spray in that, downstream of the passage, the primary fluid is admixed both to a central region of the essentially annular spray emerging from the outlet and to an outer periphery of the substantially annular spray.
  • the problem underlying the invention is also solved by a method for injecting a secondary fluid into a primary fluid, wherein the secondary fluid is gaseous or liquid or contains fine particulate solids to be dispersed in the primary fluid, wherein generating a in the Substantially annular secondary jet fluid jet surrounding the downstream end of the passageway, priming the primary fluid at the upstream end of the passageway by a propulsion jet of the annular jet and mixing primary fluid with secondary fluid both in a region between a jet axis of the jet annular spray jet and the spray jet as well as in a region adjacent to an outer periphery of the spray jet area.
  • Fig. 1 a schematic sectional view of an inventive
  • Fig. 2 is a schematic sectional view of an inventive
  • Fig. 3 a schematic view of an inventive
  • Fig. 4 a schematic representation of an inventive
  • Spray system according to a fourth embodiment against a flow direction Spray system according to a fourth embodiment against a flow direction.
  • FIG. 1 shows a basic configuration of a spray system according to the invention.
  • an annular nozzle housing 3 is arranged with a nozzle main axis or with a longitudinal axis 16. From this nozzle housing 3, a secondary fluid 5 at the downstream end 4 enters into - - talt an annular spray 12 from.
  • the total annular spray jet 12 may be formed by a plurality of individual jets, which are arranged on a ring, see. Fig. 3, Fig. 4 or as shown in Fig. 1, by a single annular gap beam.
  • the annular nozzle housing 3 encloses a central nozzle 6, which is formed by means of a passage channel with a convergent inlet region 7, a constriction 8 and a divergent outlet part 9, which follow one another in the flow direction.
  • the secondary fluid 5 is supplied via the pipe 10 to an annular cavity 1 1 of the annular nozzle housing 3.
  • the secondary fluid 5 fills this cavity 1 1 in operation of the nozzle and then exits at the end 4 of the nozzle housing 3 in the form of the annular spray jet 12.
  • the primary fluid 1 is not mixed into the secondary fluid 5 exclusively via the conical surface of the spray jet 12. Rather, the spray nozzle for the secondary fluid 5 is designed such - - That it acts as an annular propulsion jet nozzle on the primary fluid 1.
  • the primary fluid 1 is additionally sucked via the central nozzle 6, which is similar to the inlet of a turbine air jet engine, and fed to the rich Monbe the spray jet 12. In this way, it is achieved that close to the axis 16 of the spray jet 12 good evaporation conditions for droplets exist or advantageous boundary conditions for the interference of the secondary fluid 5 in the primary fluid 1 are present.
  • the nozzle for the secondary fluid is designed here as a two-fluid nozzle, in which a liquid is atomized as a secondary fluid with a gaseous Zerstäubungsangesmedium and sprayed into the primary fluid, here in flue gas to be cooled, for the purpose of evaporative cooling of the primary fluid 1.
  • the hot primary gas 1 is sucked axially by the Examstahlpumpen Angel the two-fluid nozzle and thus creates on the beam axis 16 from the beginning good boundary conditions for the evaporation of the drops.
  • This two-fluid nozzle is further characterized in that the secondary fluid 5, the cooling fluid, exits via a narrow annular gap which runs coaxially to the main axis 16 of the spray nozzle. Furthermore, close to this annular gap for liquid radially inwardly and outwardly more annular gaps, over which the atomization auxiliary medium is blown.
  • the annular gaps for the cooling liquid and for the atomization auxiliary medium are supplied via a supply line from outside with the appropriate fluids.
  • FIG. 2 which encloses a central nozzle for the suction of the primary fluid
  • many small individual nozzles can be arranged in such a ring that they collectively exert an annular driving jet effect on the primary fluid 1 and this thus suction axially, see the embodiments of FIG. 3 and FIG. 4.
  • the inlet of the central nozzle 6 for the suction of the primary fluid 1 is not displaced by dust deposits, since higher suction velocities are induced by the suction effect of the jet jet nozzle configuration.
  • the central nozzle 6 even more likely to erosion damage, so that an appropriate choice of material must be made.
  • a small cleaning nozzle of the central nozzle 6 can be connected in such a way that it keeps the inlet of dust deposits.
  • Such a cleaning nozzle 22 is also shown schematically in FIG. 2. This cleaning nozzle 22 could, for example, be connected to the supply line of the gaseous atomizing auxiliary medium.
  • a significant advantage of such an annular gap nozzle is that the distribution of the secondary fluid 5 and the sputtering auxiliary medium to the spray nozzle can be made much simpler than with a bundle head nozzle (cluster nozzle), which consists of a plurality of individual nozzles.
  • bundle nozzles can be supplied with fluids of very different temperature, for example water at 20 ° C. and steam at 300 ° C., which is used as decomposition gas. - - Dusting aid medium is used.
  • the distribution of water and steam to the individual nozzles of the bundle nozzles is associated with a high cost and with the risk of considerable thermal stresses.
  • the secondary fluid 5 is sprayed into the primary fluid 1 by means of an atomization auxiliary medium 15.
  • the secondary fluid 5 exits from a concentric to the main axis 16 of the nozzle housing 3 annular gap 17 at the end 4 of the nozzle housing 3.
  • the result is an annular spray jet 12 of secondary fluid.
  • This annular spray jet 12 is affected on both sides by ring beams 15.1 and 15.2, which consist of sputtering auxiliary medium and which lead to a rapid disintegration of the spray jet 12 of secondary fluid.
  • ring beams 15.1 and 15.2 are generated by the sputtering auxiliary medium 15 emerging from the annular gaps 18.1 and 18.2 which are likewise concentric with the main axis 16.
  • the effect of the spray jet 12 of secondary fluid 5 and the annular steel 15.1 and 15.2 of sputtering auxiliary medium 15 to the primary fluid 1 is substantially identical to the nozzle described with reference to FIG. Accordingly, here too primary fluid 1 is sucked in via the central nozzle 6 and mixed into the spray jet 12 of secondary fluid 5 from the nozzle axis 16.
  • the supply of the secondary fluid 5 via at least one pipe 10.
  • the secondary fluid 5 is fed through the nozzle housing 3, which has a symmetrical to the main axis of rotation hollow body 20, the annular gap 17.
  • the atomization aid 15 is also supplied via the nozzle housing 3, which has a further symmetrical to the main axis 16 rotational hollow body 21, the annular gaps 18.1 and 18.2. - -
  • the nozzle housing 3 forms the toroidal rotational hollow body 21, which is supplied via the supply line 19 with atomization auxiliary medium 15.
  • toroidal rotary hollow body 20 is arranged, which is smaller than the rotary hollow body 21 and which is supplied via the supply line 10 with the secondary fluid 5.
  • the rotational hollow body 20 has an approximately semicircular upstream end viewed in the cross section of FIG. 2 and tapers as far as the annular gap 17 in the flow direction.
  • the wall sections of the rotary hollow body 20 bounding the annular gap 17 are arranged at an angle to the main axis 16, so that Each of the outer walls of the annular gap 17 forms a truncated cone that widens in the direction of flow.
  • the annular sections delimiting wall portions of the rotary hollow body 20 are not arranged parallel to each other but slightly tapering in the direction of flow.
  • the rotary hollow body 20 thus forms a streamlined body-like shape in the cross-section of FIG. 2.
  • the rotary hollow body 20 is arranged in the larger rotary hollow body 21, which, viewed in the cross section of FIG. 2, also forms a streamlined body-like shape.
  • At the upstream end of the rotary hollow body 21 is formed approximately circular section-shaped. This section forms with its inner side the inlet of the central nozzle 6.
  • the rotary hollow body 21 has walls arranged concentrically to the main axis 16, which thereby form the constriction 8 of the passage channel of the central nozzle 6.
  • the rotary hollow body 21 tapers in the manner of a streamline body.
  • the inner wall of the rotary hollow body 21, which faces the main axis 16, thereby forms the outlet part 9 of the passage channel of the central nozzle 6.
  • the outer walls of the rotary hollow body 21 are guided in the region of the annular gap 17 of the rotary hollow body 20 substantially parallel to the outer walls of the rotary hollow body 20. Seen in the direction of the main axis 16, the annular gap 18.1 thus arises between the hollow rotary body 20 and the inner wall of the rotary hollow body 21. Seen from the main axis 16 outwardly between the outer wall of the rotary hollow body 20 and the outer wall of the rotary hollow body 21 of the annular gap 18.2 is formed.
  • the annular gaps 18.1 and 18.2 are, as shown in FIG. 2 can be seen, approximately the same width.
  • the annular gap 17 is also the same width as the annular gaps 18.1 and 18.2 in the illustrated embodiment. It is possible within the scope of the invention to make the gap widths different.
  • the annular gaps 17 and 18.1 and 18.2 are arranged so that they each form a truncated cone widening in the direction of flow.
  • the issued, annular spray jets 12 and 15.1 and 15.2 extend in the flow direction, therefore, also frusto-conical.
  • FIG. 1 and 2 are schematic and it is specifically noted that in Fig. 1, the nozzle housing 3 is shown far too large compared to the diameter of the flue gas duct 2 and a container penetrated by flue gas, as a full-scale drawing is not meaningful would have been. In fact, the diameter D of the nozzle housing 3, as shown in Fig. 2, be on the order of 30 mm to 150 mm, while the diameter of the flue gas ducts 2 and container on the order of about 2000 mm to about 15,000 mm.
  • the order of magnitude of the water flow to be atomized into small droplets with such a nozzle according to the invention is 100 l / min for an annular diameter of 100 mm, provided that the admission pressure of the atomizer - - Auxiliary air for spraying air at approx. 6 bar.
  • the width of the annular gap 17 for the secondary fluid 5, see Fig. 2, and the width of the annular gaps 18.1 and 18.2 for the sputtering auxiliary medium 15 is of the order of 0, 1 mm to 1, 5 mm.
  • steam is used as sputtering auxiliary medium 15, it may be advantageous to thermally isolate the water-carrying components, that is, the components which carry the secondary fluid 5, against the steam-carrying components.
  • the invention thus provides a spraying system comprising at least one nozzle for injecting a liquid or gaseous secondary fluid into a primary fluid or for dispersing fine particulate solids in said primary fluid, characterized in that the spraying system is in the form of a propulsion jet pump. which sucks primary fluid and supplies it to the central area of the spray jet.
  • the spray system can be composed of many individual nozzles, which enclose a central nozzle in an annular manner, via which primary fluid is sucked.
  • the spray system may consist of a single annular die via which the secondary fluid is sprayed with or without atomization aid and this annular die surrounds a central nozzle annularly via which primary fluid is drawn.
  • a swirl generator can be arranged.
  • the invention thus relates to devices and methods for spraying fluids and for dispersing solids in channels or containers through which a primary gas flows.
  • at least one nozzle is used for spraying a fluid or for dispersing fine particulate solids in said channels or containers.
  • a multi-component nozzle with a primary gas jet is provided. Use finds the invention - - For example, in flue gas ducts or in flue gas cleaning plants in power plants or in the cement industry.
  • FIG. 3 shows a spray system according to the invention according to a third embodiment of the invention.
  • An annular nozzle housing 30 is toroidal in shape and has a shape similar to the nozzle housing 3 of FIG. 1.
  • the nozzle housing 30 forms a rotational hollow body, to which secondary fluid is supplied via a feed line 32.
  • the feed line 32 also serves to attach the nozzle housing 30 to the wall of a flue gas channel, cf. Fig. 2.
  • the annular nozzle housing 30 encloses a passageway of a central nozzle 6 for primary fluid.
  • the passageway of the central nozzle 6 has seen in the flow direction a convergent inlet, a constriction and a divergent outlet region and is similar to the passageway of the central nozzle 6 in Figs. 1 and 2 formed.
  • the nozzle housing 30 is shown in the illustration of FIG. 3 counter to the flow direction.
  • An outlet opening for the secondary fluid is formed by twelve circular outlet openings 34, which are annularly arranged surrounding the end of the passage channel of the central nozzle.
  • a substantially annular spray of secondary fluid is generated as a whole, which, as explained with reference to the embodiments of FIGS. 1 and 2, exerts a propelling jet effect on the primary fluid within the passage channel of the central nozzle 6.
  • the operation of the spray system shown schematically in Fig. 3 is characterized by the same as the operation of the spray systems according to the invention described with reference to FIGS. 1 and 2.
  • FIG. 4 shows a further spray system according to the invention with an annular nozzle housing 40 which has a toroidal shape, as already described with reference to FIGS. 1 and 2 and the nozzle - - housing 3 has been described.
  • the nozzle housing 40 is connected via a pipe 42 to an inner wall of a flue gas duct, see FIG. 1.
  • supply lines for secondary fluid and gaseous sputtering auxiliary medium are arranged, for example, water or compressed air or steam.
  • a total of twelve outlet openings 34 for secondary fluid are arranged in a ring shape.
  • Each of the secondary fluid outlet openings 34 is surrounded by an annular gap 44 for the gaseous atomization aid.
  • each of the secondary fluid outlet openings 34 may themselves be designed as an annular gap opening.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Nozzles (AREA)
  • Treating Waste Gases (AREA)

Abstract

L'invention concerne un système de pulvérisation pour pulvériser un fluide secondaire (5) dans un fluide primaire (1), le fluide secondaire (5) étant gazeux ou liquide ou contenant de fines particules solides qui doivent être dispersées dans le fluide primaire (1). Le système de pulvérisation présente au moins une buse centrale (6) pour le fluide primaire et au moins une buse pour pulvériser le fluide secondaire, un boîtier de buse (3) de la buse étant de forme tubulaire et la buse centrale (6) étant pourvue d'un canal de passage central pour le fluide primaire (1). Le canal de passage présente, vu dans le sens d'écoulement, une zone d'entrée convergente (7), un étranglement (8) et une partie de sortie divergente (9). Au moins une ouverture de sortie pour le fluide secondaire (5) est disposée à l'extrémité (4) située en aval du boîtier de buse (3) et au moins une ouverture de sortie est formée et disposée pour produire un jet pulvérisé (12) de fluide secondaire (5) qui entoure de manière essentiellement annulaire le fluide primaire (1) sortant du canal de passage central.
EP11713276A 2010-04-09 2011-04-08 Système de pulvérisation et procédé pour pulvériser un fluide secondaire dans un fluide primaire Withdrawn EP2555858A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010014580A DE102010014580A1 (de) 2010-04-09 2010-04-09 Mehrstoffdüse mit Primärgaskernstrahl
PCT/EP2011/055521 WO2011124686A1 (fr) 2010-04-09 2011-04-08 Système de pulvérisation et procédé pour pulvériser un fluide secondaire dans un fluide primaire

Publications (1)

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EP2555858A1 true EP2555858A1 (fr) 2013-02-13

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US (1) US20130068852A1 (fr)
EP (1) EP2555858A1 (fr)
CN (1) CN102834168A (fr)
DE (2) DE102010014580A1 (fr)
WO (1) WO2011124686A1 (fr)

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Also Published As

Publication number Publication date
US20130068852A1 (en) 2013-03-21
DE202011110485U1 (de) 2014-04-17
CN102834168A (zh) 2012-12-19
DE102010014580A1 (de) 2011-10-13
WO2011124686A1 (fr) 2011-10-13

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