EP0189856A2 - Dispositif pour mélanger un courant de gaz principal avec au moins un courant de gaz secondaire - Google Patents

Dispositif pour mélanger un courant de gaz principal avec au moins un courant de gaz secondaire Download PDF

Info

Publication number
EP0189856A2
EP0189856A2 EP86100916A EP86100916A EP0189856A2 EP 0189856 A2 EP0189856 A2 EP 0189856A2 EP 86100916 A EP86100916 A EP 86100916A EP 86100916 A EP86100916 A EP 86100916A EP 0189856 A2 EP0189856 A2 EP 0189856A2
Authority
EP
European Patent Office
Prior art keywords
gas stream
secondary gas
inflow openings
flow
inlet
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Withdrawn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
EP86100916A
Other languages
German (de)
English (en)
Other versions
EP0189856A3 (fr
Inventor
Carl Prof.Dr.-Ing. Kramer
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 EP0189856A2 publication Critical patent/EP0189856A2/fr
Publication of EP0189856A3 publication Critical patent/EP0189856A3/fr
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • 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
    • B01F25/10—Mixing by creating a vortex flow, e.g. by tangential introduction of flow components

Definitions

  • the invention relates to a device for mixing a main gas stream with at least one secondary gas stream of the type specified in the preamble of claim 1.
  • a main gas stream has to be mixed with at least one secondary gas stream.
  • Different gas flows often have very different temperatures, especially in industrial ovens or dryers. So if a single homogeneous gas stream with a very precisely defined temperature is to be formed from the various gas streams, expensive precautions must be taken.
  • the invention is therefore based on the object of providing a device for mixing a main gas stream with at least one secondary gas stream of the type specified, in which the disadvantages mentioned above do not occur.
  • a device which, with a structurally simple flow guidance, ensures a very uniform mixing of the different gas streams without an additional substantial pressure loss occurring.
  • the advantages achieved by the invention are based in particular on the fact that the secondary gas stream (s) are fed to the main gas stream in a flow region in which the main gas stream experiences a strong convective acceleration.
  • a flow area is e.g. B. the inlet area of a fan into which the main gas flow from a larger space, for example the interior of a chamber furnace or a dryer, enters.
  • the advantageous effect of the invention can be further increased by the fact that the bypass flow or the secondary gas streams, which will be explained later, obtain a tangential component with respect to the direction of flow of the main gas stream, that is to say they experience a swirl effect , which allows thorough mixing with the main gas stream.
  • This swirl can be directed, for example in the case of a radial fan, in such a way that, based on the direction of rotation of the fan wheel, there is a counter-swirl, as a result of which the pressure increase in the portion of the secondary gas flow provided with counter-swirl is further increased.
  • the filling of the fan wheel can improve at a higher speed of this exiting, swirled secondary gas flow, which also results in a more favorable efficiency of the fan.
  • hot gas fans it is at possible in this way, for example, to design the rounding of the fan cover plate with a smaller radius than would otherwise be desirable for fluidic reasons. This brings considerable structural advantages and greater strength, which is important for higher temperatures.
  • annular chamber In order to mix the hot exhaust gas stream generated by a burner without streaks with the main gas stream sucked in by the fan, an annular chamber can be provided which encloses the suction opening of the fan in the manner of a spiral housing for a radial fan.
  • the direction of flow in this housing is the reverse of that of the radial fan. Due to the shape of the volute casing, the direction of flow of the gas stream to be mixed is the same, which also ensures uniform mixing.
  • the shape of the spiral also allows the size of the tangential velocity component which determines the swirl of the secondary gas flow to be determined when it exits the inflow openings.
  • High-speed burners are particularly suitable for this installation situation, in which the injector effect of the exhaust gas flow from the burner can also be used. Suck in gas from the environment to cool the flame area through a gap surrounding the burner tube.
  • the cooling effect achieved thereby makes it possible to use relatively inexpensive materials with lower temperature resistance for the design of the inlet area, despite the high flame temperatures.
  • a favorable embodiment is a spiral annular chamber made of heat-resistant steel sheet, the back of which faces the inlet from the inlet-inlet plane has a certain distance. The portion of the main stream flowing to the inlet through the gap formed in this way then likewise advantageously contributes to the removal of heat.
  • the annular chamber can also be provided with ribs on its outer surfaces, which are advantageous in three ways: they direct the flow, enlarge the exchange surface for the heat transfer and stiffen the construction. By appropriately aligning the ribs, the part of the main flow near the wall can also be given a twist.
  • the hot contact surface between the inflow and the burner flow is suitable for directly heated drying devices and the appropriate composition of the dryer atmosphere for the combustion of solvent gases that occur during drying.
  • the combustion air required for the combustion of gaseous components can be mixed in through a chamber, which is viewed in the direction of the main flow, behind the annular chamber for the burner.
  • a possible field of application for this embodiment is the combustion of rolling oil in chamber furnaces for rolled strip coils.
  • the radial fan 1 shows an embodiment in which two secondary gas streams are mixed with the intake stream of a radial fan 1.
  • the radial fan 1 is located in a housing 2, from which the volume flow conveyed can emerge, for example upwards and downwards or on both sides.
  • the main gas flow indicated by the flow arrows 3 in FIG. 2 and sucked in by the radial fan 1, enters the radial fan wheel 1 through the circular inlet area 4 tapering in the direction of flow and is accelerated by the latter, so that the tapered inlet area 4 enters pressure is lower than in the inflow space.
  • inflow openings are provided for the secondary gas flows to be mixed.
  • the Zuström-openings are fed 5 in a first chamber 8 of the lead-in area 4 of 'the secondary gas flow 7 and arranged in flow direction behind Zuström openings 6 in a chamber 10 of the secondary gas stream 9.
  • the openings 5, 6 Due to their corresponding fluidic design, in the embodiment according to FIGS. 1 and 2, the openings 5, 6 have approximately the shape of a gill, the inflow openings 5 and 6 give the emerging secondary gas flows a
  • This swirl can e.g. B. be directed in a radial fan so that, based on the direction of rotation of the fan wheel, there is a counter-swirl, whereby the pressure increase in the counter-swirl portion of the secondary gas flows is increased.
  • the filling of the ventilator wheel can improve at a higher speed of this emerging swirl flow, so that in addition there is a more favorable efficiency of the centrifugal fan 1.
  • the secondary gas flows 7 and 8 are transported in the axial direction against the conveying direction of the radial fan 1 and then deflected through an angle of 90 ° in the radial direction so that they can exit via the inflow openings 5, 6 .
  • the inflow openings 5, 6 gill-like can also be used which give the emerging tangential component the tangential component described. If no tangential component is required, the inflow openings can also be designed as simple holes or slots.
  • FIGS. 3 and 4 show an embodiment of a device for mixing a main gas stream with a Secondary gas flow is shown, which is located in the suction area of a radial fan in the ceiling of a chamber furnace.
  • the hot exhaust gas stream generated by a burner and serving as a secondary gas stream must be mixed without streaks with the main gas stream drawn in by the radial fan.
  • an annular chamber 11 is provided which surrounds the suction opening 12 of the radial fan 13 in the manner of a spiral housing for a radial fan (see also FIG. 4).
  • the spiral shape of the annular chamber 11 results in an inflow direction of the secondary gas stream to be mixed that is the same around the circumference and which already produces a swirl in the secondary stream without further precautions. It then makes sense to adapt the shape of the inflow openings to this swirl direction. In this case, however, it may already be sufficient to provide simple holes as inflow openings.
  • High-speed burners are particularly suitable for this installation situation, in which the injector effect of the burner flow can still be used to draw in gas from the environment for cooling the area in the vicinity of the flame 15 generated by the burner 14 through a gap 16 which is between the burner 14 and the associated wall surface of the annular chamber 11 has been formed. As can be seen in particular in FIG. 4, this gap 16 therefore surrounds the burner tube 14.
  • the front wall of the mixing device has been omitted to improve clarity; it can be seen that there is a large contact area which is heated on the one hand by the spiral channel and on the other hand is cooled by the main gas stream sucked in by the radial fan 13. This makes it possible, in spite of the relatively high temperatures in the area of the flame 15, to use materials for forming the inlet area, which in comparison with conventional materials Combustion chamber materials have low temperature resistance, which results in cost savings.
  • the hot contact surface between the main gas flow on the one hand and the burner flow on the other hand is still suitable for directly heated dryers for the combustion of solvent gases that occur during drying. If such a mixing device is used in a furnace which works with a small excess of air, the combustion air required for the combustion of gaseous constituents can be supplied through a chamber which is arranged behind the burner in the manner of the chamber 10 in the embodiment according to FIG. 2 .
  • a possible field of application for this embodiment is the combustion of rolling oil in chamber furnaces for the heat treatment of rolled strip coils.
  • FIG. 5 shows an embodiment in which two burners 14, 17 are arranged offset around the circumference of the inflow opening.
  • the flames 15, 18 of the two burners 14, 17 point in the direction of the center line of the spiral housing 11, which surrounds the inlet area of the radial fan 13.
  • FIG. 6 shows an embodiment similar to FIG. 3.
  • the device does not lie tightly on the housing 19 of the radial fan 20, but is separated from it by a gap 21.
  • Ribs 22 are arranged on the outer wall surfaces of the device, which stiffen the housing, enlarge the exchange surface for the heat transfer and direct the flow.
  • the ribs 22a arranged in the inlet area are set up in such a way that the portion of the main stream which they capture also has a desired direction and thereby a swirl.
  • the gap 21 serves to use the partial amount of the main flow indicated by the flow arrows 23 in FIG. 6 for cooling the area between the fan housing 19 and the device 24.
  • the inlet area enclosed by the device 24 is divided into a tapered portion 25 and a cylindrical portion 26. The transition between these two parts can, however, also take place continuously.
  • the cylindrical part 26 is designed so that its diameter differs from the diameter of the inlet ring of the fan 27. By reducing the diameter 26 compared to the diameter 27, the negative pressure in the inlet area of the device is increased.
  • FIG. 7 also shows guide devices with which the mixing between the main stream and the secondary stream and the residence time of the portion of the main stream close to the wall on the surfaces of the device can be influenced with a temperature different from the main stream.
  • a device with an inlet area is again shown, which is divided into a tapering part 28 and an almost cylindrical part 29.
  • the inflow openings 30 are simple holes or slots 31.
  • the guide devices are simple surface elements, for example. Triangles 32a, 32b or 32c, quadrilaterals 33 or diamonds 34. The triangles can point with their tip against the flow direction (32a, 32b) or in the flow direction 32c.
  • the guidance devices are on supports e.g. Support plate strips 35 mounted, which lead to an increasing or decreasing or unchangeable inclination of the guide device in the direction of flow. It is also possible to design the guide devices in the form of folded sheets 36. Depending on the requirements, all or part of the inflow openings can be provided under or next to the guide devices.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
EP86100916A 1985-01-26 1986-01-23 Dispositif pour mélanger un courant de gaz principal avec au moins un courant de gaz secondaire Withdrawn EP0189856A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3502648 1985-01-26
DE19853502648 DE3502648A1 (de) 1985-01-26 1985-01-26 Vorrichtung zur mischung eines haupt-gasstroms mit mindestens einem neben-gasstrom

Publications (2)

Publication Number Publication Date
EP0189856A2 true EP0189856A2 (fr) 1986-08-06
EP0189856A3 EP0189856A3 (fr) 1989-01-18

Family

ID=6260872

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86100916A Withdrawn EP0189856A3 (fr) 1985-01-26 1986-01-23 Dispositif pour mélanger un courant de gaz principal avec au moins un courant de gaz secondaire

Country Status (4)

Country Link
US (1) US4767317A (fr)
EP (1) EP0189856A3 (fr)
CA (1) CA1257583A (fr)
DE (1) DE3502648A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018005192B3 (de) 2018-07-02 2019-12-05 Truma Gerätetechnik GmbH & Co. KG Brennervorrichtung
US20220282871A1 (en) * 2021-03-05 2022-09-08 Electrolux Home Products, Inc. Oven bake heating channel exchange system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5038751A (en) * 1990-06-25 1991-08-13 Richard Riedling Direct fired unit heater

Family Cites Families (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE468813A (fr) *
NL27330C (fr) *
DE379037C (de) * 1920-11-17 1923-08-10 Andreas Scherhag Dipl Ing Lufterhitzer
US2075258A (en) * 1933-07-01 1937-03-30 American Blower Corp Gas mixing apparatus
US2508792A (en) * 1947-12-15 1950-05-23 David Ludwig Company Heating apparatus
FR1045560A (fr) * 1949-03-01 1953-11-30 Services Publics Et D Ind Soc Mélangeur de gaz
US2797904A (en) * 1953-11-27 1957-07-02 James T Voorheis Multiple venturi scrubber
AT195406B (de) * 1955-10-01 1958-02-10 Chemie Linz Ag Verfahren und Vorrichtung zum Mischen von zwei oder mehreren Gasen oder Flüssigkeiten untereinander
DE1189521B (de) * 1955-11-29 1965-03-25 Schmidt Sche Heissdampf Vorrichtung zum Zufuehren, Foerdern und Mischen von mindestens drei Gasen verschiedener Herkunft und Temperatur durch einen Propellersaugzug
US3117770A (en) * 1961-04-19 1964-01-14 Crom B Campbell Combination air warming and centrifugal fan unit for transmitting heated air
DE1501944B2 (de) * 1965-02-06 1972-01-13 Johann Vaillant Kg, 5630 Remscheid Geblaese fuer oelvergasungsbrenner
US3566582A (en) * 1969-04-04 1971-03-02 Entoleter Mass contact between media of different densities
DE7242602U (fr) * 1972-11-20 1976-04-29 Hoogovens Ijmuiden B.V., Ijmuiden (Niederlande)
FR2222124A1 (en) * 1973-03-23 1974-10-18 Pillard Chauffage Combustion gases homogenizing equipment - ensures uniform temperatures for drying plants, gas turbines and jet engines
US3849906A (en) * 1973-11-07 1974-11-26 Ibm Rotary fluid applicator
US3922108A (en) * 1974-03-18 1975-11-25 Wallace Murray Corp Pre-whirl turbo charger apparatus
US4030712A (en) * 1975-02-05 1977-06-21 Alco Standard Corporation Method and apparatus for circulating a heat treating gas
US4078576A (en) * 1976-09-17 1978-03-14 American Air Filter Company, Inc. Gas mixer
GB1568706A (en) * 1977-05-27 1980-06-04 Rolls Royce Furnace
US4374637A (en) * 1978-10-31 1983-02-22 Zwick Energy Research Organization, Inc. Burner construction
US4395233A (en) * 1981-06-22 1983-07-26 G. S. Blodgett Co., Inc. Dual flow heating apparatus
AT381464B (de) * 1985-04-01 1986-10-27 Waagner Biro Ag Mischeinrichtung fuer unterschiedlich temperierte gasstroeme

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018005192B3 (de) 2018-07-02 2019-12-05 Truma Gerätetechnik GmbH & Co. KG Brennervorrichtung
US20220282871A1 (en) * 2021-03-05 2022-09-08 Electrolux Home Products, Inc. Oven bake heating channel exchange system
US12031727B2 (en) * 2021-03-05 2024-07-09 Electrolux Home Products, Inc. Oven bake heating channel exchange system

Also Published As

Publication number Publication date
EP0189856A3 (fr) 1989-01-18
DE3502648C2 (fr) 1988-05-26
US4767317A (en) 1988-08-30
CA1257583A (fr) 1989-07-18
DE3502648A1 (de) 1986-07-31

Similar Documents

Publication Publication Date Title
DE69732341T2 (de) Brenner
DE2438845C3 (de) Ringbrennkammer für ein Gasturbinentriebwerk
DE2443371A1 (de) Gekuehlte zuendungseinrichtung
DE2727795C2 (de) Brennkammer für eine Gasturbine
DE2261596C3 (fr)
EP0233330B1 (fr) Ensemble de brûleur-chaudière
DE2808051A1 (de) Brennkammer fuer eine gasturbine o.dgl.
DE2158215B2 (de) Brennkammer für Gasturbinentriebwerke
DE3503089C2 (fr)
DE2212321A1 (de) Brenneranordnung
EP0645583A1 (fr) Brûleur à gaz
EP0189856A2 (fr) Dispositif pour mélanger un courant de gaz principal avec au moins un courant de gaz secondaire
DE2518094C2 (de) Vergasungsbrenner
EP0483520A2 (fr) Procédé et dispositif pour la combustion des combustibles gazeux et liquided avec génération réduite des substances nocives
DE19538364A1 (de) Vorrichtung zur Schnellerwärmung von Metall-Preßbolzen
DE1812405C3 (de) Wirbelbrenner mit einer zentralen öl- und/oder Gaszuführung
DE1558557C3 (de) Umwälzbackofen
DE2037480C3 (de) Vorrichtung zum Erzeugen eines Trocknungs-Luftstromes z.B. für Konvektionstrockner
EP0007424A1 (fr) Brûleur pour combustion de carburants liquides
EP0706013B1 (fr) Echangeur de chaleur à gaz
DE4109192A1 (de) Oel- oder gas-geblaesebrenner
DE2219686A1 (de) Thermischer nachverbrenner
DE1937034U (de) Wandlufterhitzer.
DE2415571A1 (de) Lufterhitzer
DE2323920A1 (de) Brenner

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT BE CH DE FR GB IT LI NL

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE CH DE FR GB IT LI NL

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19890719