EP0904806B1 - Mischvorrichtung für Fluide - Google Patents

Mischvorrichtung für Fluide Download PDF

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Publication number
EP0904806B1
EP0904806B1 EP97810719A EP97810719A EP0904806B1 EP 0904806 B1 EP0904806 B1 EP 0904806B1 EP 97810719 A EP97810719 A EP 97810719A EP 97810719 A EP97810719 A EP 97810719A EP 0904806 B1 EP0904806 B1 EP 0904806B1
Authority
EP
European Patent Office
Prior art keywords
housing
metering valve
vortex
feed pipe
extinguishing
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
EP97810719A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0904806A1 (de
Inventor
Frédéric Äbischer
Manfred Russwurm
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.)
General Electric Switzerland GmbH
Original Assignee
Alstom SA
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
Priority to DK97810719T priority Critical patent/DK0904806T3/da
Priority to PT97810719T priority patent/PT904806E/pt
Priority to ES97810719T priority patent/ES2185894T3/es
Priority to EP97810719A priority patent/EP0904806B1/de
Priority to DE59708568T priority patent/DE59708568D1/de
Application filed by Alstom SA filed Critical Alstom SA
Priority to CN98125007A priority patent/CN1102415C/zh
Priority to JP10278963A priority patent/JPH11165053A/ja
Publication of EP0904806A1 publication Critical patent/EP0904806A1/de
Application granted granted Critical
Publication of EP0904806B1 publication Critical patent/EP0904806B1/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
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
    • B01F25/431—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor
    • B01F25/43197—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor characterised by the mounting of the baffles or obstructions
    • B01F25/431971—Mounted on the wall
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C5/00—Making of fire-extinguishing materials immediately before use
    • A62C5/008—Making of fire-extinguishing materials immediately before use for producing other mixtures of different gases or vapours, water and chemicals, e.g. water and wetting agents, water and gases
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C99/00—Subject matter not provided for in other groups of this subclass
    • A62C99/0009—Methods of extinguishing or preventing the spread of fire by cooling down or suffocating the flames
    • A62C99/0018—Methods of extinguishing or preventing the spread of fire by cooling down or suffocating the flames using gases or vapours that do not support combustion, e.g. steam, carbon dioxide
    • 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
    • B01F25/3131—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit 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
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
    • B01F25/431—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
    • B01F25/431—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor
    • B01F25/4317—Profiled elements, e.g. profiled blades, bars, pillars, columns or chevrons
    • B01F25/43171—Profiled blades, wings, wedges, i.e. plate-like element having one side or part thicker than the other
    • 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 device for introducing CO 2 into a preferably liquid extinguishing medium, consisting essentially of a housing with an extinguishing agent supply line, a supply pipe for CO 2 provided with a metering valve, and an outlet line.
  • a device for introducing CO 2 into a preferably liquid extinguishing medium consisting essentially of a housing with an extinguishing agent supply line, a supply pipe for CO 2 provided with a metering valve, and an outlet line.
  • Such mixing devices are well known, for example from WO 95 2427 4 .
  • the inert gas is usually added in gaseous form and also serves as a blowing agent for the extinguishing agent.
  • the inert gas is intermittently fed into the mixing device in order to achieve a defined plug flow in the feed line to the extinguishing nozzles.
  • Another known solution for manual fire extinguishers according to DE-U1 295 10 982 provides that CO 2 is added to the extinguishing agent at the extinguishing nozzle itself. This is to produce an aerosol-like mixture with water droplets brought to freezing temperature. It is understood that this measure cannot create a homogeneous bubble flow upstream of the extinguishing nozzle.
  • the invention has for its object to provide a mixing device of the type mentioned, in which a largely homogeneous two-phase mixture is generated with defined CO 2 bubbles, which predominate up to the downstream quenching nozzle. Another task is seen in providing a measure with which icing of the extinguishing agent on the occasion of the expansion of the liquid CO 2 is considerably avoided.
  • the housing is aligned vertically in its longitudinal axis, that the extinguishing agent supply line is connected to the housing at its lower end, that the outlet line branches off from the upper end of the housing, that the CO 2 supply pipe enters the housing from above flows out, extends at least approximately to its lower end and is provided with spraying agents at the pipe end, the CO 2 in the supply pipe being guided in counterflow to the extinguishing agent and the length of the supply pipe between the metering valve and spraying agent being such that during the Operation with the metering valve closed forms a gas cushion on its downstream side.
  • the advantages of the invention can be seen, inter alia, in the particular simplicity of the measure.
  • the device is also very effective at an operating pressure of less than 12 bar. This means that the entire extinguishing system with the lines and fittings inside can be designed for the 16 bar suitable for fire protection.
  • the feed pipe on its outer wall and / or the housing on its inner wall with three-dimensional vortex-generating Means is provided.
  • Large-scale longitudinal vortices can be generated with this fast, controlled mixing of the flowing substances enable low pressure loss within the shortest distance at the same time.
  • the advantage of such a vortex generator is in its particular simplicity to see in every way.
  • the element can usually by its hollow interior to be used, the inert gas in the extinguishing agent to flow through the channel.
  • the device consists of a housing 1 arranged vertically in its longitudinal axis and enclosing a mixing channel 22, which in the simplest case can be a cylindrical, metallic tube. At its lower end, it is connected to an extinguishing agent supply line 2 via a commercially available attachment (not shown). At its top,
  • End of the housing 1 is penetrated by a supply pipe provided with a metering valve 3 4 CO 2, wherein the metering valve 3 immediately outside of the housing 1 is located.
  • a CO 2 connection 8 is provided upstream of this metering valve 3 .
  • An outlet line 5 leading to the extinguishing nozzles also branches off from the housing 1 from the upper end.
  • the CO 2 supply pipe 4 extends coaxially to the lower end of the housing.
  • injection means 6 which in the simplest case are holes arranged regularly over the circumference of the pipe 4 .
  • the feed pipe 4 is made in two parts, the part 4a adjoining the metering valve 3 being made of a material with poor thermal conductivity and the part 4b adjoining the injection means being made of a material having good thermal conductivity. This is based on the following considerations, explained on the basis of the mode of operation:
  • Water is used as an extinguishing agent with a pressure between 4 and 10 bar, preferably 6 bar, and a temperature of preferably 10 ° C. Within the housing 1, a water speed of approximately 5 m / sec is considered favorable.
  • CO 2 is used as the inert gas, although other water-soluble agents are of course also conceivable.
  • the liquid CO 2 via a high pressure line, not shown, with a pressure of max. 70 bar fed in at a temperature of approx. 30 ° C.
  • the metering valve 3 is used for the actual quantity control. At the same time, it functions as a check valve when starting up and shutting down the system or during its intermittent operation.
  • the extinguishing agent penetrates from the housing 1 via the injection means 6 into the interior of the feed pipe 4 and rises therein. It compresses the gas column contained therein - which at least consists of air when starting up - and moves it against the metering valve 3 to form a gas cushion 7.
  • the gas cushion 7 prevents water from being added to the metering valve 3 came into contact. From this it can be seen that the feed tube 4 must not be less than a certain length in order to generate a suitable gas plug.
  • the gas cushion 7 must be dimensioned such that no water reaches the valve 3 even in the event of the strong swirling of the water column in order to avoid icing.
  • the part 4a adjoining the metering valve 3 is preferably made of poorly conductive plastic in order to ensure the lowest possible heat transfer between the cold liquid inert gas and water flowing in the countercurrent in the housing 1 . In any case, it is important to avoid that icing, also local, occurs in the interior of the housing. On the other hand, to promote the heating and evaporation of the inert gas further downstream, a material with good thermal conductivity is selected here in part 4b.
  • the injection means 6 which can be radial bores or a screen-like attachment, are dimensioned such that even when the inert gas is injected into the mixing channel 22 through which the extinguishing agent flows, a homogeneous fine distribution of the gas in the water with the smallest possible gas bubbles takes place. However, it is important to ensure that the nozzle bores are large enough to prevent the openings from freezing.
  • the liquid inert gas evaporates when it comes into contact with the warmer water and thereby dissolves.
  • the first goal is to dissolve as much gas as possible;
  • the goal is to achieve the saturation state of the mixture.
  • 21 flow-influencing means in the form of vortex generators 9 are arranged in the flow-through channel 19 on the inside of the housing wall 21. These vortex generators 9 are arranged such that a sufficiently large mixing zone 22 within the housing 1 is available downstream thereof.
  • such a vortex generator 9 essentially consists of three freely flowing triangular surfaces. These are a roof surface 10 and two side surfaces 11 and 13. In their longitudinal extent, these surfaces run at certain angles in the direction of flow.
  • the side surfaces 11 and 13, which consist of right triangles, are fixed with their long sides on the inside wall 21 of the housing. They are oriented so that they form a joint on their narrow sides, including an arrow angle ⁇ .
  • the joint is designed as a sharp connecting edge 16 and is also perpendicular to that wall 21 with which the side surfaces 11 and 13 are flush. Installed in a channel 19, the flow cross-section is hardly affected by blocking because of the sharp connecting edge 16 .
  • the two side surfaces 11, 13 including the arrow angle ⁇ are symmetrical in shape, size and orientation and are arranged on both sides of an axis of symmetry 17. This axis of symmetry 17 is rectified like the channel axis.
  • the roof surface 10 lies with a very flat edge 15 running transversely to the longitudinal direction of the housing 1 on the same wall as the side walls 11, 13. Its longitudinal edges 12, 14 are flush with the longitudinal edges of the side surfaces protruding into the channel 19 through which the air flows 11 and 13.
  • the roof surface 10 extends at an angle ⁇ to the housing inner wall 21. Its longitudinal edges 12, 14 form a tip 18 together with the connecting edge 16.
  • the connecting edge 16 of the two side surfaces 11, 13 forms the downstream edge of the vortex generator 9.
  • the transverse to the longitudinal direction of the Housing 1 extending edge 15 of the roof surface 10 is thus the of Channel flow first applied edge.
  • the vortex generator 9 works as follows: When flowing around the edges 12 and 14, the flow is converted into a pair of opposing vortices. The vortex axes lie in the axis of the flow. The geometry of the vortex generators 9 is selected so that no backflow zones arise during the vortex generation.
  • the swirl number of the vortex is determined by a corresponding choice of the angle of attack ⁇ and / or the arrow angle ⁇ . With increasing angles, the vortex strength or the number of swirls is increased and the location of the vortex breakdown (if this is desired at all) moves upstream into the area of the vortex generator 9 itself. Depending on the application, these two angles are ⁇ and ⁇ are determined by the structural conditions and by the process itself. All that then has to be adjusted is the height of the vortex generator 9 , which corresponds to that of the connecting edge 16.
  • the height h of this connecting edge 16 will be coordinated with the channel height H in such a way that the vortex generated immediately downstream of the vortex generator 9 already reaches such a size that the full channel height or the full height of the channel part assigned to the vortex generator is filled in, which leads to a uniform distribution in the applied cross section.
  • Another criterion which can influence the ratio h / H to be selected is the pressure drop that occurs when the vortex generator 9 flows around. It goes without saying that the pressure loss coefficient also increases with a larger ratio h / H.
  • the sharp connecting edge 16 in FIG. 3 is that point which is first acted upon by the channel flow.
  • the element is rotated by 180 °.
  • the two opposite vortices have changed their sense of rotation. They rotate along the roof surface 10 and strive towards the wall on which the vortex generator 9 is mounted.
  • Vortex generators 9 strung together with or without gaps in the circumferential direction.
  • the height h of the elements 9 is approximately 90% of the channel height H.
  • Such vortex generators can also be arranged uniformly or axially staggered in several levels of the housing.
  • the invention is of course not limited to the exemplary embodiment shown and described.
  • a water-foam mixture would also be conceivable.
  • CO 2 as the inert gas
  • nitrogen or air can also be used. Larger variations in the values specified for extinguishing agents and inert gas are also possible. Basically, the higher the water pressure and the lower the water temperature, the more CO 2 can be solved.
  • vortex generating elements other than the vortex generators shown can also be used. Basically, all static mixers are suitable, provided their pressure drop is not too great.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Accessories For Mixers (AREA)
  • Nozzles (AREA)
  • Fire-Extinguishing Compositions (AREA)
  • Jet Pumps And Other Pumps (AREA)
EP97810719A 1997-09-30 1997-09-30 Mischvorrichtung für Fluide Expired - Lifetime EP0904806B1 (de)

Priority Applications (7)

Application Number Priority Date Filing Date Title
PT97810719T PT904806E (pt) 1997-09-30 1997-09-30 Disposiyivo de mistura de fluidos
ES97810719T ES2185894T3 (es) 1997-09-30 1997-09-30 Dispositivo de mezclado para fluidos.
EP97810719A EP0904806B1 (de) 1997-09-30 1997-09-30 Mischvorrichtung für Fluide
DE59708568T DE59708568D1 (de) 1997-09-30 1997-09-30 Mischvorrichtung für Fluide
DK97810719T DK0904806T3 (da) 1997-09-30 1997-09-30 Anordning til blanding af fluider
CN98125007A CN1102415C (zh) 1997-09-30 1998-09-29 液体混合装置
JP10278963A JPH11165053A (ja) 1997-09-30 1998-09-30 流体のための混合装置及び、混合装置の運転方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP97810719A EP0904806B1 (de) 1997-09-30 1997-09-30 Mischvorrichtung für Fluide

Publications (2)

Publication Number Publication Date
EP0904806A1 EP0904806A1 (de) 1999-03-31
EP0904806B1 true EP0904806B1 (de) 2002-10-23

Family

ID=8230408

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97810719A Expired - Lifetime EP0904806B1 (de) 1997-09-30 1997-09-30 Mischvorrichtung für Fluide

Country Status (7)

Country Link
EP (1) EP0904806B1 (zh)
JP (1) JPH11165053A (zh)
CN (1) CN1102415C (zh)
DE (1) DE59708568D1 (zh)
DK (1) DK0904806T3 (zh)
ES (1) ES2185894T3 (zh)
PT (1) PT904806E (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024013176A1 (de) * 2022-07-12 2024-01-18 Messer Se & Co. Kgaa Vorrichtung zum erzeugen eines temperierten, kalten gasstroms

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1078653A1 (de) 1999-08-24 2001-02-28 Asea Brown Boveri Ag Vorrichtung zum Einbringen eines Inertgases in ein Löschmittel
JP4658359B2 (ja) * 2001-03-15 2011-03-23 株式会社初田製作所 消火方法及び消火装置
WO2008139417A2 (en) * 2007-05-14 2008-11-20 L'air Liquide-Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Systems and methods for mixing fluids
FI20105231A (fi) * 2010-03-10 2011-09-11 Wetend Technologies Oy Menetelmä ja reaktori yhden tai useamman kemikaalin sekoittamiseksi prosessinestevirtaukseen
JP6218867B2 (ja) * 2015-07-13 2017-10-25 Ｊｆｅエンジニアリング株式会社 凝縮設備
JP6218868B2 (ja) * 2015-07-13 2017-10-25 Ｊｆｅエンジニアリング株式会社 気液混合器
WO2018131104A1 (ja) * 2017-01-12 2018-07-19 Ｊｆｅエンジニアリング株式会社 気液混合器
CN114192040A (zh) * 2021-12-22 2022-03-18 徐州克林斯曼安防科技有限公司 一种适用于锂离子电池灭火剂的生产方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2608438B1 (fr) * 1986-12-23 1990-08-31 Sterlini Jacques Dispositif de lutte contre l'incendie
US5315491A (en) * 1992-09-30 1994-05-24 American Ingenuity, Inc. Reflecting and luminous layered material
ES2117977T3 (es) * 1992-10-20 1998-09-01 Sundholm Goeran Procedimiento e instalacion contra incendios.
SE502759C2 (sv) 1994-03-06 1996-01-08 Seal Flock Ab Förfarande och anordning för applicering av fibrer med hjälp av friktionsuppladdning
DE29510982U1 (de) 1995-07-13 1995-09-21 Broemme, Albrecht, Dipl.-Ing., 12203 Berlin Feuerlöscher

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024013176A1 (de) * 2022-07-12 2024-01-18 Messer Se & Co. Kgaa Vorrichtung zum erzeugen eines temperierten, kalten gasstroms

Also Published As

Publication number Publication date
CN1102415C (zh) 2003-03-05
CN1218701A (zh) 1999-06-09
ES2185894T3 (es) 2003-05-01
JPH11165053A (ja) 1999-06-22
DK0904806T3 (da) 2003-02-24
PT904806E (pt) 2003-03-31
EP0904806A1 (de) 1999-03-31
DE59708568D1 (de) 2002-11-28

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