EP0424895B1 - Verfahren zum Einbringen und Dosieren eines flüssigen Behandlungsmediums bei Verbrennungsprozessen - Google Patents

Verfahren zum Einbringen und Dosieren eines flüssigen Behandlungsmediums bei Verbrennungsprozessen Download PDF

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Publication number
EP0424895B1
EP0424895B1 EP90120347A EP90120347A EP0424895B1 EP 0424895 B1 EP0424895 B1 EP 0424895B1 EP 90120347 A EP90120347 A EP 90120347A EP 90120347 A EP90120347 A EP 90120347A EP 0424895 B1 EP0424895 B1 EP 0424895B1
Authority
EP
European Patent Office
Prior art keywords
medium
nozzle
treatment medium
mixing chamber
atomized
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
EP90120347A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0424895A2 (de
EP0424895A3 (en
Inventor
Johannes Josef Edmund Martin
Thomas Nikolaus
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.)
Martin GmbH fuer Umwelt und Energietechnik
Original Assignee
Martin GmbH fuer Umwelt und Energietechnik
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 Martin GmbH fuer Umwelt und Energietechnik filed Critical Martin GmbH fuer Umwelt und Energietechnik
Priority to AT90120347T priority Critical patent/ATE88803T1/de
Publication of EP0424895A2 publication Critical patent/EP0424895A2/de
Publication of EP0424895A3 publication Critical patent/EP0424895A3/de
Application granted granted Critical
Publication of EP0424895B1 publication Critical patent/EP0424895B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J7/00—Arrangement of devices for supplying chemicals to fire
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/003—Arrangements of devices for treating smoke or fumes for supplying chemicals to fumes, e.g. using injection devices

Definitions

  • the invention relates to a method for introducing and metering a liquid treatment medium into the exhaust gas stream in combustion processes.
  • a treatment medium for example chemicals to reduce the NO x content in exhaust gases
  • a carrier medium for example chemicals to reduce the NO x content in exhaust gases
  • the two-component nozzle has the disadvantage that steam or compressed air is supplied as the atomizing medium or carrier medium, as a result of which undesirable dilution of the flue gases by air or steam occurs, which reduces the efficiency of the steam generation or possibly the exhaust gas cleaning system because a large amount is used for the atomization this medium is needed.
  • the atomization in a two-component nozzle is carried out by the kinetic energy of the atomizing medium, which causes the high volume throughput of this medium.
  • these atomizing media are expensive because they always require high amounts of energy and, in the case of steam, treated boiler feed water.
  • the routing of these media down to the individual nozzles is complex, since either heat-insulated pipes in the case of steam or relatively large cross sections have to be used to reduce the pressure loss in the system.
  • the expansion of the media at the nozzle outlet or the media flow in the lines generate a relatively high noise level, which often even makes sound insulation necessary.
  • the atomized liquid is first brought into a distribution chamber, from which several pipes are placed at an angle to the direction of flow of the gas stream, so that the exhaust gas flow to be treated can flow around the outlet openings of these distribution pipes to prevent the atomized liquid from caking at the outlet end of the To avoid pipes.
  • a simple two-substance nozzle in which the atomized liquid exits in the direction of flow of the gas stream to be treated, the atomized liquid can adhere to the outlet opening of the two-substance nozzle due to turbulence.
  • this known two-substance nozzle also has the disadvantage that the metering of the liquid to be atomized is difficult because the tube of the two-substance nozzle has a certain conveying capacity for conveying the liquid to be atomized and this The amount cannot be throttled too much, otherwise the liquid will not atomize evenly.
  • a two-component nozzle in which a medium, for example a suspension by a second medium, for example air, is atomized within a nozzle in an atomization zone, the mixture of the two media, namely from the atomizing medium and the atomizing medium in finely divided form emerges from a common nozzle opening.
  • a diffuser to be arranged downstream of the common outlet opening from the atomization chamber in order to reduce the pressure of the atomized mist so that turbulence and thus the risk of caking on the outside of the nozzle are avoided.
  • Mixtures of the medium to be atomized can be achieved here with the atomizing medium, the energy source for atomization, but here too, as in the embodiment described above according to DE-OS 35 41 599, difficulties exist in metering the medium to be atomized, because the feed pipe of the two-fluid nozzle for conveying the medium to be atomized has a certain conveying capacity and this amount cannot be throttled arbitrarily, because otherwise too little medium gets into the mixing chamber in which this medium is to be atomized.
  • the second medium which introduces the energy to the atomization, cannot be reduced arbitrarily, because otherwise the pressure in the corresponding supply line drops too far, so that atomization no longer takes place.
  • the object of the invention is to provide a method for introducing and metering a liquid treatment medium into the exhaust gas stream in combustion processes, with the aid of which simple and safe metering of the treatment medium to be atomized, and in any quantity, is ensured with little construction effort and with low energy consumption is.
  • the quantitative ratio of treatment medium to carrier medium can be varied as desired in the range from 0 to 100% because the mixing chamber is always filled with a liquid medium and the necessary atomization pressure can always be maintained, regardless of whether there is no treatment medium at all or only treatment medium.
  • the amount of treatment medium to be atomized can be changed simply and quickly by changing the mixing ratio of treatment medium and carrier medium by regulating the quantity of the treatment medium supplied under pressure or set the carrier medium. For example, it is possible to atomize only pure treatment medium and switch off the carrier medium and vice versa. If only the carrier medium is atomized from the nozzle, this serves to cool the nozzle if the carrier medium is, for example, water.
  • the amounts of energy to be used are very low because the media can be brought to the atomization pressure required in each case with simple pumps.
  • the structural outlay for carrying out the method is also particularly low because the atomizing nozzle required for this has a single atomizing opening which is directly connected to the mixing chamber.
  • the atomization takes place exclusively on the basis of the pressure difference between the mixing chamber and the area around the nozzle, this pressure difference being able to be set so high that backflows of the atomized treatment medium and the associated caking on the nozzle cannot occur, as a result of which the injection direction is arbitrary to the flow direction of the exhaust gas stream to be treated can be adjusted.
  • the volume of the mixture is dimensioned such that the atomization lasts a few seconds, a maximum of 30 seconds, then it is ensured that a control process that requires rapid changes in the mixing ratio or a rapid shutdown of the nozzle can be carried out without further ado can because there is only a small amount in the mixing chamber with a respectively set mixing ratio.
  • the atomizing nozzle has a nozzle body 1 which on the one hand has pressure supply lines 2 and 3 and on the other hand a mixing chamber 4 comprises.
  • the pressure supply lines 2 and 3 open into the mixing chamber 4 and are connected at their other ends on the one hand to a supply line 5 for the treatment medium and on the other hand to a supply line 6 for the carrier medium.
  • a nozzle head 8 which can be screwed onto the nozzle body 1 and has a single atomizing bore 9, from which the mixture of carrier medium and treatment medium emerges and due to the prevailing pressure difference inside and outside the atomizing nozzle is atomized.
  • the mixing chamber 4 has only a small volume, so that when the mixing ratio of treatment medium and carrier medium changes, only a small amount of already mixed substances occurs, ie the change can be implemented very quickly if the mixing chamber 4 has a small volume.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Nozzles (AREA)
  • Treating Waste Gases (AREA)
  • Chimneys And Flues (AREA)
  • Heat Treatment Of Water, Waste Water Or Sewage (AREA)
  • Nozzles For Spraying Of Liquid Fuel (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
EP90120347A 1989-10-24 1990-10-23 Verfahren zum Einbringen und Dosieren eines flüssigen Behandlungsmediums bei Verbrennungsprozessen Expired - Lifetime EP0424895B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90120347T ATE88803T1 (de) 1989-10-24 1990-10-23 Verfahren zum einbringen und dosieren eines fluessigen behandlungsmediums bei verbrennungsprozessen.

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE3935401A DE3935401C1 (enrdf_load_stackoverflow) 1989-10-24 1989-10-24
DE3935401 1989-10-24
SG44994A SG44994G (en) 1989-10-24 1994-03-26 Method for introducing and for dosing a liquid treatment medium in combustion processes

Publications (3)

Publication Number Publication Date
EP0424895A2 EP0424895A2 (de) 1991-05-02
EP0424895A3 EP0424895A3 (en) 1991-08-21
EP0424895B1 true EP0424895B1 (de) 1993-04-28

Family

ID=25886397

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90120347A Expired - Lifetime EP0424895B1 (de) 1989-10-24 1990-10-23 Verfahren zum Einbringen und Dosieren eines flüssigen Behandlungsmediums bei Verbrennungsprozessen

Country Status (9)

Country Link
EP (1) EP0424895B1 (enrdf_load_stackoverflow)
JP (1) JP2531543B2 (enrdf_load_stackoverflow)
AT (1) ATE88803T1 (enrdf_load_stackoverflow)
BR (1) BR9005346A (enrdf_load_stackoverflow)
CA (1) CA2028392C (enrdf_load_stackoverflow)
DE (1) DE3935401C1 (enrdf_load_stackoverflow)
DK (1) DK0424895T3 (enrdf_load_stackoverflow)
ES (1) ES2041101T3 (enrdf_load_stackoverflow)
SG (1) SG44994G (enrdf_load_stackoverflow)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007003665B4 (de) * 2006-08-09 2017-08-31 Martin GmbH für Umwelt- und Energietechnik Düse zum Einbringen und Dosieren eines Behandlungsmediums in den Abgasstrom bei Verbrennungsprozessen

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1057985B (de) * 1952-03-07 1959-05-21 Ernst Schlick Zerstaeuber fuer miteinander zu vermischende Fluessigkeiten
JPS5216472A (en) * 1975-07-30 1977-02-07 Babcock Hitachi Kk Nox reducing agent feeding process and waste gas treatment process
SE449449B (sv) * 1984-11-26 1987-05-04 Bejaco Ab Forfarande for inblandning av finfordelad vetska i ett gasflode samt anordning for utovande av forfarandet
SE452413B (sv) * 1984-12-04 1987-11-30 Flaekt Ab Medieblandande dysa, avsedd att utnyttjas i en kontaktreaktor
DE3935400C1 (enrdf_load_stackoverflow) * 1989-10-24 1990-08-09 Martin Gmbh Fuer Umwelt- Und Energietechnik, 8000 Muenchen, De

Also Published As

Publication number Publication date
JP2531543B2 (ja) 1996-09-04
SG44994G (en) 1994-11-25
JPH03255811A (ja) 1991-11-14
CA2028392A1 (en) 1991-04-25
DE3935401C1 (enrdf_load_stackoverflow) 1991-06-20
BR9005346A (pt) 1991-09-17
ATE88803T1 (de) 1993-05-15
EP0424895A2 (de) 1991-05-02
CA2028392C (en) 1999-03-23
EP0424895A3 (en) 1991-08-21
DK0424895T3 (da) 1993-08-16
ES2041101T3 (es) 1993-11-01

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