EP0134040B1 - Verfahren zum Zuführen von pulverförmigem Material in einem Kesselfeuerraum und Vorrichtung zum Durchführen dieses Verfahrens - Google Patents

Verfahren zum Zuführen von pulverförmigem Material in einem Kesselfeuerraum und Vorrichtung zum Durchführen dieses Verfahrens Download PDF

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Publication number
EP0134040B1
EP0134040B1 EP84110063A EP84110063A EP0134040B1 EP 0134040 B1 EP0134040 B1 EP 0134040B1 EP 84110063 A EP84110063 A EP 84110063A EP 84110063 A EP84110063 A EP 84110063A EP 0134040 B1 EP0134040 B1 EP 0134040B1
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EP
European Patent Office
Prior art keywords
hearth
gas
suspension
powder material
injecting
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
Application number
EP84110063A
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English (en)
French (fr)
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EP0134040A1 (de
Inventor
François Malaubier
Michel Vandycke
Bernard Auric
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.)
Houilleres De Bassin Du Centre Et Du Midi Public A Caractere Industriel Et Commercial Ets
Stein Industrie SA
Original Assignee
Houilleres De Bassin Du Centre Et Du Midi Public A Caractere Industriel Et Commercial Ets
Stein Industrie 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.)
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Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=9291833&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0134040(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Houilleres De Bassin Du Centre Et Du Midi Public A Caractere Industriel Et Commercial Ets, Stein Industrie SA filed Critical Houilleres De Bassin Du Centre Et Du Midi Public A Caractere Industriel Et Commercial Ets
Priority to AT84110063T priority Critical patent/ATE34210T1/de
Publication of EP0134040A1 publication Critical patent/EP0134040A1/de
Application granted granted Critical
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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

Definitions

  • the present invention relates to a method for injecting a pulverulent material into a furnace of a fossil solid fuel boiler, in which the pulverulent material is suspended in a gas and then introduced into the furnace. It also extends to a device for implementing this method.
  • the object of the present invention is to provide a method of injecting a pulverulent material into a boiler hearth which ensures better contact between the grains of pulverulent material and the combustion gases, and consequently improves the efficiency of the injection of pulverulent material, and in particular the percentage reduction in the sulfur dioxide and sulfuric anhydride contents in the flue gases at the outlet of the boiler in the case where the pulverulent material is an oxide or an alkaline earth or alkali metal salt capable of fixing these anhydrides to form a sulfate. It also aims to allow the injection of large quantities of pulverulent material and to ensure good dispersion of the latter in the hearth without significantly disturbing the operation of the boiler.
  • the method according to the invention is characterized in that the pulverulent material is suspended in a low flow of gas, which is introduced into the hearth at low speed, and in that it is introduced into the hearth around or slightly below the suspending gas a flow of hot air or auxiliary hot gas of at least 1 kg per kg of material suspended in said gas, at a speed included at its outlet in the foyer between 30 and 70 m / s.
  • the gas for suspending the pulverulent material is cold air.
  • the gas loaded with pulverulent material is injected at several points around the edge of the fireplace.
  • the hot air introduced into the hearth around or a little below the suspending gas is taken from the combustion air supply to the hearth.
  • the gas loaded with pulverulent material is injected into the hearth at a level where the maximum temperature of the fumes is between 1000 ° and 1500 ° C.
  • the injection points in the hearth are chosen so that the residence time of the pulverulent material in the hearth between its injection level and the level where the temperature of the fumes is reduced to 800 ° C. is sufficient for the pulverulent material react chemically.
  • the invention further extends to a device for injecting pulverulent material into a hearth of a fossil solid fuel boiler, according to the above method, characterized in that it comprises at least one injection nozzle in the focal point of powdery material suspended in a low gas flow, and at least one injection nozzle with a higher flow of hot air or hot gas around or slightly below the gas injection nozzle carrier of the pulverulent material, at a flow rate of at least 1 kg per kg of material suspended in said carrier gas.
  • the invention applies to boilers with fossil solid fuel, coal or lignite, whether these are introduced into the boiler in the pulverized state, in the granular state, on a grate or possibly using projectors, or are suspended there in a fluid bed.
  • the pulverulent material can be an alkaline earth or alkaline oxide, or an alkaline earth or alkali metal salt, for example quicklime or slaked lime, limestone, magnesia, dolomite, its effect then being to react on the sulfurous and sulfuric anhydrides formed during the combustion of the solid fuel by forming a solid sulfate, and thereby reducing the content of the fumes in these anhydrides.
  • an alkaline earth or alkaline oxide or an alkaline earth or alkali metal salt, for example quicklime or slaked lime, limestone, magnesia, dolomite, its effect then being to react on the sulfurous and sulfuric anhydrides formed during the combustion of the solid fuel by forming a solid sulfate, and thereby reducing the content of the fumes in these anhydrides.
  • it can also be a material intended to modify the fusibility of the ashes, or more generally to influence the chemical reactions occurring in the hearth.
  • the nozzle 1 is surrounded by the annular nozzle 4 of hot air, at a temperature of 250 ° to 320 ° C, taken from the combustion air circuit, the flow of which is adjustable by the flap 5.
  • the annular vein d hot air surrounding the cold air stream loaded with lime ensures a distribution of lime throughout the cross section of the hearth, and in particular prevents the grains of lime from going down the hearth along its wall.
  • the level 11 of the lime injectors in the cold air corresponds to a maximum smoke temperature of 1350 ° C.
  • the height H separating this level from that of the steam superheaters 6, where the maximum temperature of the fumes is approximately 800 ° C., is such that the residence time of the lime particles in the boiler between these two levels is approximately 2 seconds, which allows them to react to a large extent with sulfurous and sulfuric anhydrides, without however being brought to a too high temperature which would cause their surface fusion and a decrease in their reactivity.
  • the hot air to keep the lime in suspension enters the pipe at level 15, a little below the lime injection level.
  • the pulverized charcoal burners are located at levels 12, 13 and 14, notably below the lime and hot air injectors.
  • FIG. 13 shows the arrangement of the lime injectors 11A, 11B, 11C, 11D in horizontal cross section, in the corners of the hearth.
  • the injectors could be arranged on two opposite faces of the hearth (for example front face and rear face) in the case of a hearth with frontal heating.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Glass Compositions (AREA)
  • Crucibles And Fluidized-Bed Furnaces (AREA)

Claims (7)

1. Verfahren zum Einspeisen von pulverförmigem Material in einen mit fossilen Festbrennstoffen beheizten Heizkessel, in dem das pulverförmige Material in einem Gas in Suspension gebracht und diese Suspension dann in den Brennraum eingeführt wird, dadurch gekennzeichnet, daß man das pulverförmige Material in einem geringen Gasstrom in Suspension bringt und mit geringer Geschwindigkeit in den Brennraum einspeist (1), und daß man in den Brennraum um den Gasstrom, der die Suspension trägt, oder knapp unterhalb dieses Stroms, einen Hilfsstrom warmer Luft oder warmen Gases einspeist (4) und zwar mindestens ein Kilo pro Kilogramm in Suspension gebrachten Materials und mit einer Geschwindigkeit, die am Einlaß in den Brennraum zwischen 30 und 70 m/s beträgt.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Gas, mit dem das pulverförmige Material in Suspension gebracht wird, kalte Luft ist.
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das mit dem pulverförmigen Material befrachtete Gas an verschiedenen Punkten über den Umfang des Brennraums (11A, 11 B, 11C, 11D, Fig. 3) eingespeist wird.
4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die warme Luft, die in den Brennraum um das die Suspension bildende Gas herum oder knapp unterhalb dieses Gases eingespeist wird, aus der Versorgungsleitung des Brennraums mit Verbrennungsluft entnommen wird.
5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß das mit pulverförmigen Material befrachtete Gas in den Brennraum in einer Höhe eingespeist wird, in der die höchste Rauchgastemperatur zwischen 1000 und 1500°C liegt.
6. Verfahren nach einem der Ansprüche 1 bis 5 zum Einspeisen von Kalk in einen Kohlebrennraum, dadurch gekennzeichnet, daß die Einspeisepunkte in den Brennraum so gewählt sind, daß die Verweildauer des pulverförmigen Kalks im Brennraum zwischen seinem Einspeiseniveau und dem Niveau, bei dem die Temperatur der Rauchgase auf 800°C abgesunken ist, etwa 2 Sekunden beträgt.
7. Vorrichtung zum Einspeisen eines pulverförmigen Materials in einen Brennraum (3) eines mit fossilen Festbrennstoffen beheizten Heizkessels nach einem beliebigen der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß sie eine Einspeisedüse (1) zum Einspeisen des in einer geringen Gasmenge in Suspension gehaltenen pulverförmigen Materials in den Brennraum und mindestens eine Düse (4) zur Einspeisung warmer Luft oder warmen Gases um oder knapp unterhalb der Einspeisedüse des in Gas gehaltenen pulverförmigen Materials in Mengen von mindestens 1 Kg pro Kg des im Trägergas suspendierten Materials aufweist.
EP84110063A 1983-08-26 1984-08-23 Verfahren zum Zuführen von pulverförmigem Material in einem Kesselfeuerraum und Vorrichtung zum Durchführen dieses Verfahrens Expired EP0134040B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84110063T ATE34210T1 (de) 1983-08-26 1984-08-23 Verfahren zum zufuehren von pulverfoermigem material in einem kesselfeuerraum und vorrichtung zum durchfuehren dieses verfahrens.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8313779A FR2551184B1 (fr) 1983-08-26 1983-08-26 Procede d'injection d'un materiau pulverulent dans un foyer de chaudiere, et dispositif de mise en oeuvre de ce procede
FR8313779 1983-08-26

Publications (2)

Publication Number Publication Date
EP0134040A1 EP0134040A1 (de) 1985-03-13
EP0134040B1 true EP0134040B1 (de) 1988-05-11

Family

ID=9291833

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84110063A Expired EP0134040B1 (de) 1983-08-26 1984-08-23 Verfahren zum Zuführen von pulverförmigem Material in einem Kesselfeuerraum und Vorrichtung zum Durchführen dieses Verfahrens

Country Status (4)

Country Link
EP (1) EP0134040B1 (de)
AT (1) ATE34210T1 (de)
DE (1) DE3471151D1 (de)
FR (1) FR2551184B1 (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2583305B1 (fr) * 1985-06-18 1989-10-27 Fives Cail Babcock Procede de desulfuration des gaz provenant du foyer d'une chaudiere et installation pour la mise en oeuvre de ce procede.
FR2583304B1 (fr) * 1985-06-18 1989-12-22 Fives Cail Babcock Installation pour la desulfuration des gaz provenant du foyer d'une chaudiere.
US5027723A (en) * 1986-07-14 1991-07-02 Inland Steel Company Method and apparatus for reducing sulfur dioxide content in flue gases
US5048431A (en) * 1986-07-14 1991-09-17 Inland Steel Company Method and apparatus for reducing sulfur dioxide content in flue gases
US5246364A (en) * 1986-07-14 1993-09-21 Inland Steel Company Method and apparatus for reducing sulfur dioxide content in flue gases
CA1309571C (en) * 1986-07-14 1992-11-03 Ronald R. Landreth Method and apparatus for reducing sulfur dioxide content in flue gases
HU200361B (en) * 1987-12-28 1990-05-28 Gyoergy Vamos Composition and process for reducing slagging of boiler furnaces and sulfur emission

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1601959B2 (de) * 1968-03-09 1971-06-09 Senft, Hugo, 4300 Essen Vorrichtung zur zugabe von rauchgasseitig korrosionen verhin dernden staeuben oder aufgeschlaemmter staeuben
US3746498A (en) * 1972-01-24 1973-07-17 Combustion Eng Reducing no{11 {11 emissions by additive injection
FR2349368A1 (fr) * 1976-04-26 1977-11-25 Charbonnages De France Procede et dispositif d'introduction et de dispersion d'une matiere boueuse dans une enceinte
DE3133321A1 (de) * 1980-09-05 1982-04-08 Österreichische Draukraftwerke AG, 9020 Klagenfurt "verfahren zur entschwefelung von kohlegefeuerten kraftwerken"

Also Published As

Publication number Publication date
FR2551184B1 (fr) 1985-10-11
FR2551184A1 (fr) 1985-03-01
EP0134040A1 (de) 1985-03-13
ATE34210T1 (de) 1988-05-15
DE3471151D1 (en) 1988-06-16

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