EP0484317A2 - Procédé pour l'injection d'additifs solides dans des installations de combustion, ainsi que dispositif pour la mise en oeuvre de ce procédé - Google Patents

Procédé pour l'injection d'additifs solides dans des installations de combustion, ainsi que dispositif pour la mise en oeuvre de ce procédé Download PDF

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Publication number
EP0484317A2
EP0484317A2 EP91890261A EP91890261A EP0484317A2 EP 0484317 A2 EP0484317 A2 EP 0484317A2 EP 91890261 A EP91890261 A EP 91890261A EP 91890261 A EP91890261 A EP 91890261A EP 0484317 A2 EP0484317 A2 EP 0484317A2
Authority
EP
European Patent Office
Prior art keywords
slurry
additives
agitator mill
solid additives
injection
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Withdrawn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
EP91890261A
Other languages
German (de)
English (en)
Other versions
EP0484317A3 (en
Inventor
Friedrich Dr. Birkner
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.)
Magindag Steirische Magnesit Industrie AG
Original Assignee
Magindag Steirische Magnesit Industrie AG
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 Magindag Steirische Magnesit Industrie AG filed Critical Magindag Steirische Magnesit Industrie AG
Publication of EP0484317A2 publication Critical patent/EP0484317A2/fr
Publication of EP0484317A3 publication Critical patent/EP0484317A3/de
Withdrawn legal-status Critical Current

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    • 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
    • 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

Definitions

  • the invention relates to a method for injecting solid additives for the treatment of flue gases, in particular to facilitate the detachment or to prevent deposits in combustion plants, in which the additives are injected as a slurry into the combustion chamber and / or exhaust gas duct, and to a device to perform this procedure.
  • a direct injection of desulfurization agents can advantageously be used at the same time to loosen deposits, in particular pyrosulfate deposits, in the combustion chamber or in the exhaust duct in such a way that their subsequent detachment or cleaning of the incineration plant is facilitated.
  • Alkaline earth salts and in particular magnesium hydroxide have already been proposed as desulfurizing agents.
  • the production of magnesium hydroxide requires that the water used for the hydration is subsequently separated off again.
  • a particularly fine grinding is a prerequisite for the injection of solids, as a result of which a relatively expensive starting product must be used.
  • Fine-grained, solid desulfurizing agents and aggregates also have a tendency to form lumps when stored in a humid environment, which further increases the effort required to inject such solids.
  • Mg (OH) 2 Mg (OH) 2
  • particularly fine grinding is again required, and dispersants must also be added to increase the storage stability.
  • the slurry has to be transported after its manufacture, which results in a significantly increased transport volume and weight due to the liquid medium used for the slurry.
  • the finest grinding required for the production of the suspension leads to a largely homogeneous particle size distribution, as does the direct injection of solids in solid form, which limits the range and the range over which a corresponding conversion in the combustion chamber or in the exhaust gas duct is possible after the injection .
  • the invention now aims to avoid the disadvantages associated with the use of a slurry, particularly with regard to transportability and storage stability, and to dispense with the use of dispersants in the preparation of such slurries. Furthermore, the invention aims to provide a product suitable for injection, which allows a broader grain size spectrum in the suspension and in this way allows the free path length to be adapted to the requirements in the interior of a combustion chamber or the exhaust gas duct.
  • the method according to the invention essentially consists in that the slurry is produced in an agitator mill immediately before the injection.
  • the preparation of the slurry in an agitator mill immediately prior to injection also offers the possibility of introducing a number of additives together with the slurry in the same way as the slurry, in which case it is sufficient to add the desired additional additives Abandon agitator mill.
  • the process according to the invention is further developed by using MgO as the main constituent of the additives in the agitator mill and stirring with H20.
  • a slurry of magnesium hydroxide is formed by stirring with water, as a result of which a corresponding increase in the pH value in the area of the injection and a particularly good loosening of deposits, such as that caused by deposits in the interior of the combustion chamber and / or the exhaust duct arise.
  • This increase in the pH value also leads to a reduction in the signs of corrosion inside the boiler.
  • silica gel, zeolites, urea, carbon and, if appropriate, manganese oxides are advantageously added to the agitator mill, with such supplements, with a suitable particle size distribution, not only improving the deposit loosening, but also the desulfurization performance and the reduction in NO x in the exhaust gases.
  • the inventive device for performing this method is essentially characterized in that an agitator mill with a task for solid additives and a connection for a liquid medium, in particular H20, with the interposition of a pump via a line with nozzles in the combustion chamber and / or the exhaust gas channels Incinerator is connected.
  • an agitator mill allows a corresponding grinding process and dispersion of the ground product to be carried out in a common unit.
  • work is carried out in a closed grinding container, the specific surface pressure between the grinding balls being able to be chosen to be correspondingly high with a high packing density of the grinding media filling, without large units being required for this.
  • a preferably usable agitator mill is designed as an eccentric ring disk agitator, which accelerates the grinding media centrifugally and centripetal, with a sieve with a gap width of, for example, about 0.40 mm or a coaxial ring gap integrated in the bearing housing with a correspondingly small gap width, for example 0.20 mm, as the separating element , can be used.
  • the slurry produced in this way need only remain stable over the period of time necessary for transportation through the line between the agitator mill and the nozzles.
  • FIG. 1 schematically shows a unit of an agitator mill, solid magnesium oxide being metered into a container 2 from a storage container 3 and being slurried with the aid of a conventional stirrer 4 by metering in water.
  • the slurry is subsequently introduced through a line 5 into the grinding chamber 7, which is filled with schematically indicated balls 6, and is ground to the desired particle size distribution.
  • additional additives can be applied simultaneously with magnesium oxide via the storage container 3, which additives are slurried and ground together with the magnesium oxide and are subsequently injected into the waste gas line of the waste incinerator.
  • the slurry emerging from the agitator mill 1 is then passed through a pump 8 to bring it to the pressure suitable for injection into the waste incinerator.
  • the slurry produced in the agitator mill 1 is injected via line 9 into the exhaust line 10 via a nozzle 11. It is advantageous to select a level of the waste incineration plant in which the exhaust gas has a temperature of approximately 800 ° C., since aggregates such as urea have a particularly favorable reaction with the nitrogen oxides of the exhaust gas, especially at this temperature.
  • Adsorbents such as carbon are also injected into the exhaust gas stream in a particularly advantageous manner at temperatures of approximately 800.degree.
  • the exhaust gas stream is subsequently passed through schematically indicated waste heat boilers 14, with the injection of slurries of magnesium oxide with different grain sizes of the slurried magnesium oxide ensuring that a uniform distribution of the injected slurry takes place and in this way a complete reaction with the. acidic components of the exhaust gas takes place.
  • This procedure also ensures that the formation of deposits is prevented or at least the deposits formed in the waste heat boiler 14 can be correspondingly easily removed from the cooling surfaces.

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  • 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)
  • Treating Waste Gases (AREA)
EP19910890261 1990-10-30 1991-10-30 Method for injecting solid additives into combustion plants, as well as a device for carrying out this method Withdrawn EP0484317A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT219190A ATA219190A (de) 1990-10-30 1990-10-30 Verfahren und vorrichtung zum einduesen von festen additiven in verbrennungsanlagen
AT2191/90 1990-10-30

Publications (2)

Publication Number Publication Date
EP0484317A2 true EP0484317A2 (fr) 1992-05-06
EP0484317A3 EP0484317A3 (en) 1992-11-19

Family

ID=3529663

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910890261 Withdrawn EP0484317A3 (en) 1990-10-30 1991-10-30 Method for injecting solid additives into combustion plants, as well as a device for carrying out this method

Country Status (2)

Country Link
EP (1) EP0484317A3 (fr)
AT (1) ATA219190A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT404505B (de) * 1995-01-17 1998-12-28 Birkner Friedrich Verfahren zum verringern der korrosion in feuerungsanlagen
DE102008041530A1 (de) 2008-08-25 2010-03-04 Dirk Dombrowski Verfahren und Abgasanlage zur Reinigung SOx-haltiger Abgase, insbesondere von Schiffsbrennkraftmaschinen

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1066920A (fr) * 1951-09-19 1954-06-10 Babcock & Wilcox France Procédé de combustion avec modification de la nature des dépôts incombustibles
US4253408A (en) * 1979-08-24 1981-03-03 The United States Of America As Represented By The Secretary Of The Navy Method of protecting incinerator surfaces
DE3318374A1 (de) * 1983-05-20 1984-11-22 Günter 3000 Hannover Hackerodt Verfahren zum abtrennen von schwefeloxiden aus verbrennungsgasen sowie vorrichtung zur durchfuehrung des verfahrens
DE3935402C1 (fr) * 1989-10-24 1991-02-21 Martin Gmbh Fuer Umwelt- Und Energietechnik, 8000 Muenchen, De

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT404505B (de) * 1995-01-17 1998-12-28 Birkner Friedrich Verfahren zum verringern der korrosion in feuerungsanlagen
DE102008041530A1 (de) 2008-08-25 2010-03-04 Dirk Dombrowski Verfahren und Abgasanlage zur Reinigung SOx-haltiger Abgase, insbesondere von Schiffsbrennkraftmaschinen

Also Published As

Publication number Publication date
EP0484317A3 (en) 1992-11-19
ATA219190A (de) 1994-11-15

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