EP1726355B1 - Gas-Gas-Mischer - Google Patents

Gas-Gas-Mischer Download PDF

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Publication number
EP1726355B1
EP1726355B1 EP06008568A EP06008568A EP1726355B1 EP 1726355 B1 EP1726355 B1 EP 1726355B1 EP 06008568 A EP06008568 A EP 06008568A EP 06008568 A EP06008568 A EP 06008568A EP 1726355 B1 EP1726355 B1 EP 1726355B1
Authority
EP
European Patent Office
Prior art keywords
gas
nozzle head
flow
line
main line
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
Application number
EP06008568A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1726355A3 (de
EP1726355A2 (de
Inventor
Heinz-Dieter Dr. Obermeyer
Harald Dr. Ranke
Hans-Jürgen Dr. Reinhardt
Anton Wellenhofer
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.)
Linde GmbH
Original Assignee
Linde GmbH
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 Linde GmbH filed Critical Linde GmbH
Priority to PL06008568T priority Critical patent/PL1726355T3/pl
Publication of EP1726355A2 publication Critical patent/EP1726355A2/de
Publication of EP1726355A3 publication Critical patent/EP1726355A3/de
Application granted granted Critical
Publication of EP1726355B1 publication Critical patent/EP1726355B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B01F23/10—Mixing gases with gases
    • 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
    • B01F25/3132—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit by using two or more injector devices
    • 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
    • B01F25/3132—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit by using two or more injector devices
    • B01F25/31322—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit by using two or more injector devices used simultaneously
    • 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
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F2025/91—Direction of flow or arrangement of feed and discharge openings
    • B01F2025/918—Counter current flow, i.e. flows moving in opposite direction and colliding

Definitions

  • the invention relates to a method for mixing a first and a second gas, wherein a stream of a first gas is guided in a main line and the second gas is fed via a feed line to a nozzle head and divided into several sub-streams. Further, the invention relates to an apparatus for mixing a first and a second gas having a main conduit for guiding the first gas, a supply line for the second gas, wherein the supply line extends into the interior of the main line and at its end substantially parallel extends to the axis of symmetry of the main line, and a nozzle head which is connected at its rear end to the supply line, wherein the nozzle head has outlet channels for the second gas.
  • oxygen-enriched air is used as the oxidant.
  • the oxygen is injected for this purpose by means of an injector into the air stream, whereby a uniform distribution of the oxygen in the air flow must be achieved as possible. Otherwise, locally increased oxygen concentrations in the subsequent chemical reaction could lead to local temperature peaks, so-called "hot spots", which can have a negative effect on the reaction to be carried out or even lead to damage to the reactor.
  • a main gas of a first gas flowing in a duct section is supplied with a second gas via a supply line.
  • the discharge end of the second gas supply line extends coaxially with the axis of the passage portion and is provided with radially outwardly directed discharge passages.
  • baffles are provided so that a rotational movement of the introduced second gas is generated about the axis of the channel portion.
  • U.S. 4,674,888 discloses a gas injector for use in a mixing apparatus having a plurality of mixing elements.
  • the injector is made of porous material and ensures a uniform flow of microscopic gas bubbles across the cross-section of the mixer.
  • DE 15 57 253 discloses an apparatus for producing a homogeneous mixture of two fluid media, such as two liquids or two gases, and specifically relates to an apparatus for producing intimate admixture of two fluid media in the same physical state using the energy being developed when the fluid media are brought together at different pressures.
  • DE 37 28 557 discloses a method and apparatus that can easily achieve uniform distribution of ammonia in a hot, NO x -containing gas stream.
  • the ammonia in liquid state is injected directly into the hot gas stream under pressure.
  • Object of the present invention is to develop a method and an apparatus of the type mentioned, which allow the most homogeneous possible mixture of the two combined gases.
  • This object is achieved by a method for mixing a first and a second gas, wherein a stream of a first gas is guided in a main line and the second gas is fed via a feed line to a nozzle head and divided into several sub-streams, wherein at least a part of the Partial flows are introduced at an angle between 15 ° and 75 ° counter to the flow direction of the first gas in the first gas.
  • the inventive device of the type mentioned above is characterized in that the outlet channels are inclined at an angle between 15 and 75 ° against the axis of symmetry of the main line.
  • the outlet channels are inclined at an angle between 15 ° and 75 °, preferably 30 ° to 60 °, particularly preferably at an angle between 40 ° and 50 °, with respect to the axis of symmetry of the main line.
  • the outlet channels are directed against the flow direction of the first gas.
  • the nozzle head has a plurality of outlet channels for the second gas.
  • the outlet channels are designed so that no swirling flow is imparted to the escaping gas. It has been shown that the two gases mix more homogeneously when the gas supplied via the supply line exits in a straight line from the nozzle head and does not perform any rotational movement.
  • the supply line for the second gas and the nozzle head are designed so that they have a streamlined shape without tendency to flutter. This is achieved in that the front end of the nozzle head is rounded so that it does not experience buoyancy in the flow of the first gas and maintains a stable position. In addition, the flow resistance is reduced by this shaping.
  • the front end of the nozzle head preferably has an elliptical, parabolic or hemispherical profile.
  • the flow resistance is markedly reduced by this shaping, on the other hand it is ensured that the nozzle head in the main flow of the first gas does not experience any buoyancy and thus the flattening of the nozzle head is reduced.
  • the transition to the supply line is preferably sharp-edged, wherein the diameter of the nozzle head at this point is greater than that of the supply line.
  • the transition thus acts as a spoiler lip.
  • the diameter of the feed line at the connection point to the nozzle head is at most 90% of the diameter of the rear end of the nozzle head.
  • the angle between the outside of the nozzle head and the transition to the feed line is between 30 ° and 90 °.
  • the supply line extends to the axis of symmetry of the main line and the axis of symmetry of the nozzle head extends coaxially with the axis of symmetry of the main line.
  • outlet channels For optimum mixing of the two gases, all outlet channels must be flowed through evenly. It has been found that this can be achieved by a uniform distribution of the outlet channels in a row over the circumference of the nozzle head.
  • the outlet openings of the outlet channels are located in the rear third of the nozzle head. In this area, a defined flow has already formed due to the profiling of the nozzle head.
  • the cross-sectional areas of the outlet channels are chosen to be small in relation to the cross-sectional area of the feed line.
  • the flow resistance in the outlet channels is large against the flow resistance in the supply line and any pressure fluctuations in the gas supplied via the feed line do not or only slightly affect the throughput through the outlet channels.
  • the exit velocity of the second gas should be well below the speed of sound in order to rule out a transient, highly compressible behavior. Preferably, an exit velocity of less than half the speed of sound is selected. Suitable exit velocities are included atmospheric conditions in the range between 50 m / s and 150 m / s, preferably between 70 m / s and 100 m / s.
  • the regulation of the second gas is preferably carried out only by controlling the total supplied via the supply line current to second gas.
  • the individual individual jets of second gas flowing out through the respective outlet channels are not regulated separately.
  • the invention is particularly suitable for oxygen enrichment of an air stream.
  • Oxygen-enriched air is advantageously used in numerous oxidation processes in the chemical industry, for example in refineries, Claus processes or FCC (fluid catalytic cracking).
  • the air flow is in this case passed through the main line and injected oxygen via the supply line and the nozzle head in the air stream.
  • mixing ratios of second gas to first gas can be produced between 1: 50 to 1: 3, and air flows of up to 200,000 m 3 / h can be enriched with oxygen.
  • the preferred field of application of the invention relates to the admixing of a second gas into a stream of a first gas, wherein the flow of the first gas is between 1,000 m 3 / h and 200,000 m 3 / h, particularly preferably between 5,000 m 3 / h and 100,000 m 3 / h, is.
  • the device according to the invention is small, stable and can be quickly installed in a pipeline.
  • corresponding flanges are provided for this purpose.
  • a nozzle 3 with flanges 2 is welded in the air leading main line 1.
  • the air flow 15 runs in the figure from right to left.
  • a supply line 4 via which the air flowing in the main line 1 of air can be supplied.
  • the supply line 4 extends to the axis of symmetry 5 of the main line 1, is then angled and ends coaxially with the axis of symmetry. 5
  • a nozzle head 6 With the supply line 4, a nozzle head 6 is connected.
  • the nozzle head 6 is elliptically rounded at its front, the supply line 4 facing away from end 7.
  • the transition to the feed line 4 is stepped and sharp-edged.
  • the step-shaped transition shown in the figure with a 90 ° angle between the outside of the nozzle head 6 and the back, and transitions with angles between 30 ° and 90 °, preferably 45 °, are possible.
  • the front, the nozzle head 6 facing the end of the supply line 4 has a diameter 9, which is 90% of the rear diameter 10 of the nozzle head 6.
  • the maximum diameter 10 of the nozzle head 6 is 0.15 to 0.3 times the inner diameter of the main line 1 in order to keep the resistance to the flowing air small and to ensure sufficient stability of the nozzle head 6.
  • the interior of the nozzle head 6 is provided with a central chamber 11, which is open to the supply line 4. From the central chamber 11, a bore 12 running coaxially with the axis of symmetry 5 and a plurality of outlet channels 13 extending at an angle of 45 ° to the axis of symmetry 5 emerge.
  • the outlet openings of the outlet channels 13 lie on a lying on the lateral surface of the nozzle head 6 circle.
  • the outlet channels 13 are drilled from the outside into the nozzle head 6 and each deburred at the outer end.
  • the bores for the outlet channels 13 extend in a straight line through the body of the nozzle head 6.
  • the cross-sectional areas of the outlet channels 13 and the central bore 12 are small compared to the cross-sectional area of the feed line 4.
  • the ratio of the cross-sectional area of an outlet channel 13 to that of the feed line 4 is less than 2%. This embodiment ensures that the flow resistance in an outlet channel 13 is great against the flow resistance of the feed line 4. Pressure fluctuations in the supplied via the supply line 4 oxygen flow 14 and pressure fluctuations in the flowing in the main line 3 air 15 affect so not or only slightly on the oxygen flow rate through the outlet channels 13.
  • the velocity of the oxygen 16 flowing out through the outlet channels 13 is preferably less than 50% of the speed of sound in order to avoid transient flow conditions.
  • outlet channels 12, 13 drilled in a straight line through the nozzle head 6, so that the outflowing through the outlet channels 12, 13 oxygen experiences no twist. The formation of vortices in which oxygen does not mix is thus prevented.
  • the outflow direction 16 of 45 ° against the air flow 15 a wide penetration of the mixing jets 16 is secured in the air stream 15. The mixed flow penetrates into the laminar flow layers at the edge of the main line 1 and mixes with the air.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Gas Separation By Absorption (AREA)
  • Treating Waste Gases (AREA)
  • Percussion Or Vibration Massage (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
EP06008568A 2005-05-04 2006-04-25 Gas-Gas-Mischer Expired - Lifetime EP1726355B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL06008568T PL1726355T3 (pl) 2005-05-04 2006-04-25 Mieszalnik gaz-gaz

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005020942A DE102005020942A1 (de) 2005-05-04 2005-05-04 Gas-Gas-Mischer

Publications (3)

Publication Number Publication Date
EP1726355A2 EP1726355A2 (de) 2006-11-29
EP1726355A3 EP1726355A3 (de) 2007-08-01
EP1726355B1 true EP1726355B1 (de) 2011-06-15

Family

ID=36760075

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06008568A Expired - Lifetime EP1726355B1 (de) 2005-05-04 2006-04-25 Gas-Gas-Mischer

Country Status (6)

Country Link
EP (1) EP1726355B1 (pl)
AT (1) ATE512711T1 (pl)
DE (1) DE102005020942A1 (pl)
ES (1) ES2366797T3 (pl)
PL (1) PL1726355T3 (pl)
PT (1) PT1726355E (pl)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3682967A1 (en) 2012-09-24 2020-07-22 Arkema, Inc. Process for acrylic acid production in shell and tube oxidation reactor with improved resistance to fouling

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101848759B (zh) 2007-12-14 2013-06-05 陶氏技术投资有限公司 低剪切气体混合器
WO2009078898A1 (en) 2007-12-14 2009-06-25 Dow Technology Investments Llc Hydrocarbon/oxygen industrial gas mixer with coarse water droplet environment to reduce ignition potential
US8404189B2 (en) * 2007-12-14 2013-03-26 Dow Technology Investments Llc Oxygen/hydrocarbon rapid (high shear) gas mixer, particularly for the production of ethylene oxide
CA2701527C (en) 2007-12-14 2012-03-13 Dow Technology Investments Llc Wet scrubbing for removing particulate solids from oxygen supply line
US8404190B2 (en) 2007-12-14 2013-03-26 Dow Technology Investments Llc Hydrocarbon/oxygen industrial gas mixer with water mist
NL2001803C2 (en) * 2008-07-14 2010-01-18 Kimman Process Solutions B V A device for homogenizing fluids.
FR2980718B1 (fr) * 2011-09-29 2013-11-01 Air Liquide Medical Systems Module d'injection de gaz notamment pour installation d'administration de no gazeux
CN113368716B (zh) * 2021-04-29 2022-08-16 中冶长天国际工程有限责任公司 一种富氧点火用空氧混合器及其控制方法
CN119233860A (zh) 2022-04-27 2024-12-31 瓦克化学股份公司 用于混合气体的装置及方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191323350A (en) * 1913-10-15 1914-10-15 Alexander Constantine Ionides An Improved Method of and Means for Mixing the Constituents of a Combustible Gaseous Mixture.
CH345357A (de) * 1955-07-01 1960-03-31 Waagner Biro Ag Einrichtung zum Mischen von gasförmigen und flüssigen Medien
DE1557253A1 (de) * 1967-04-13 1970-04-02 Zink Co John Vorrichtung zur Mischung von fluiden Medien
US4674888A (en) * 1984-05-06 1987-06-23 Komax Systems, Inc. Gaseous injector for mixing apparatus
DE3728557A1 (de) * 1987-08-27 1989-03-09 Didier Eng Verfahren zur verteilung von ammoniak in einem gasstrom und vorrichtung zur durchfuehrung des verfahrens
FR2665088B1 (fr) 1990-07-27 1992-10-16 Air Liquide Procede et dispositif de melange de deux gaz.
EP1319435A3 (de) * 2001-12-12 2004-10-06 Collectplan GmbH Method and apparatus for introducing a first medium in a second medium

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3682967A1 (en) 2012-09-24 2020-07-22 Arkema, Inc. Process for acrylic acid production in shell and tube oxidation reactor with improved resistance to fouling

Also Published As

Publication number Publication date
PL1726355T3 (pl) 2011-10-31
ES2366797T3 (es) 2011-10-25
DE102005020942A1 (de) 2006-11-09
EP1726355A3 (de) 2007-08-01
ATE512711T1 (de) 2011-07-15
EP1726355A2 (de) 2006-11-29
PT1726355E (pt) 2011-08-30

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