EP0063629B1 - Coal dust supply - Google Patents
Coal dust supply Download PDFInfo
- Publication number
- EP0063629B1 EP0063629B1 EP81103220A EP81103220A EP0063629B1 EP 0063629 B1 EP0063629 B1 EP 0063629B1 EP 81103220 A EP81103220 A EP 81103220A EP 81103220 A EP81103220 A EP 81103220A EP 0063629 B1 EP0063629 B1 EP 0063629B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coal dust
- burner
- dust supply
- conduit
- fluid bed
- 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
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
- F23K3/02—Pneumatic feeding arrangements, i.e. by air blast
Definitions
- the invention relates to an entry of coal dust into a burner or reactor, which consists of a fluidized bed with at least one air / oxygen or combustion gas line leading from the fluidized bed to the burner or reactor.
- Coal dust input is a major problem in coal dust burners and in coal dust reactors.
- the decisive factor for the quality of a coal dust entry is the uniformity of the coal dust supply.
- the known allocation devices such as cellular wheel sluices, screw belt scales, etc. only loosely loosen the dust particle mixture compressed in the bunker, so that material of different bulk density clumps together in larger units and enters the burner. This leads to a fluctuating material flow, which is extremely unfavorable for combustion. is. If the oxygen supply remains the same, undesirable reactions and a reduction in the burner or reactor output then occur. The pulsation of the burner or reactor is usually spoken of.
- the invention is therefore based on the object of providing a coal entry system for coal dust burners and reactors which ensures a uniform inlet flow of coal dust particles.
- the invention is based on the idea of entering the coal particles intended for combustion as close as possible to one another in the burner or reactor so that each coal dust particle always receives the optimal oxygen supply for the combustion.
- the metering device known from DE-A2654662 already partially takes this into account.
- This known metering device for coal dust input consists of a fluidized bed with a gas line through the fluidized bed to the reactor, the line having an opening. The particles are separated in the fluidized bed so that clumps of particles attached to one another cannot interfere with the loss of material.
- the fluidized bed does not rule out the possibility of fluctuations occurring in the fluidized bed which are of a different type. These fluctuations affect both the density of the bed and the pressure and result from the operational management of the fluidized bed.
- the opening of the line leading through the fluidized bed is intermittently closed or opened again, so that the material flow is chopped up but on average becomes more uniform. This shows an advantageous possibility for regulating the material flow in that, by changing the opening intervals, the material flow can be increased or decreased within wide limits while operating the fluidized bed. This is an extraordinary advantage for optimal operation of the fluidized bed.
- the coal dust particles can also be encased in the fluidized bed with oil or other combustion gas, since the fluidized bed is also an extremely suitable mixing device. At correspondingly low temperatures, liquid oxygen can also be mixed with the coal dust particles.
- the fluidized bed also enables the coal dust particles to be preheated by partial combustion and / or supply of suitable hot gases.
- the coal dust particles intended for a burner are fluidized in a container 1 by means of blown-in air.
- the coal dust particles are continuously conveyed into the container 1 from above via a schematically illustrated, controllable cell lock 2.
- the air passes through an air supply line 3 below into the container 1 and swirls the coal dust particles located in the container 1.
- a burner line 4 leads through the container 1.
- the burner line leads from the container 1 to the burner (not shown).
- the burner line 4 has a recess inside the container, which is filled by a rotatably arranged perforated disk 5.
- a rotating cylinder can also be used instead of the perforated disc.
- the decisive factor is that there are through holes in the rotating body, into which the carbon dust particles swirled in the container 1 can penetrate. This requires a sufficient dwell time of the through holes outside the burner line 4. The dwell time results from the speed of the perforated disk 5 and its diameter, which is a multiple of the diameter of the burner line 4.
- the carbon dust particles that have penetrated are carried into the burner line 4 and are discharged there to the burner by means of combustion air fed into the burner line 4.
- the flow of the A according to the invention Carrying device according to Figure 1 can be changed continuously by changing the speed of the rotating perforated disc.
Abstract
Description
Die Erfindung betrifft einen Kohlenstaubeintrag in einen Brenner oder Reaktor, der aus einem Wirbelbett mit mindestens einer vom Wirbelbett zum Brenner oder Reaktor führenden Luft/Sauerstoff oder Verbrennungsgasleitung besteht. Der Kohlenstaubeintrag bildet einen Problemschwerpunkt an Kohlenstaubbrennern bzw. an Kohlenstaubreaktoren. Entscheidend für die Qualität eines Kohlenstaubeintrages ist die Gleichmäßigkeit der Kohlenstaubzuführung.The invention relates to an entry of coal dust into a burner or reactor, which consists of a fluidized bed with at least one air / oxygen or combustion gas line leading from the fluidized bed to the burner or reactor. Coal dust input is a major problem in coal dust burners and in coal dust reactors. The decisive factor for the quality of a coal dust entry is the uniformity of the coal dust supply.
Die bekannten Zuteilvorrichtungen wie Zellenradschleusen, Schnecken-Bandwaagen usw. lockern das im Bunker verdichtete Staubkorngemisch nur unvollkommen auf, so daß Material unterschiedlichen Schüttgewichtes in größeren Einheiten zusammengeklumpt in den Brenner eintritt. Das führt zu einem schwankenden Materialfluß, der für die Verbrennung außerordentlich ungünstig. ist. Bei gleichbleibendem Sauerstoffangebot kommt es dann zu unterwünschten Reaktionen und zu einem Nachlassen der Brenner- bzw. Reaktorleistung. Zumeist wird von einem Pulsieren des Brenners bzw. Reaktors gesprochen.The known allocation devices such as cellular wheel sluices, screw belt scales, etc. only loosely loosen the dust particle mixture compressed in the bunker, so that material of different bulk density clumps together in larger units and enters the burner. This leads to a fluctuating material flow, which is extremely unfavorable for combustion. is. If the oxygen supply remains the same, undesirable reactions and a reduction in the burner or reactor output then occur. The pulsation of the burner or reactor is usually spoken of.
Das Pulsieren des Brenners läßt sich auch mit einer pneumatischen Zwischenstufe bisher nicht ausreichend verhindern. In der Regel lassen sich bei zwischengeschalteten pneumatischen Eintragsystemen Rohrbögen mit engen Radien nicht vermeiden, die durch Verdichtung den Vorteil einer mit der Pneumatik vorher erreichten gleichmäßigeren Verteilung der Brennstoffpartikel weitgehend aufheben.The pulsation of the burner has so far not been sufficiently prevented even with a pneumatic intermediate stage. As a rule, pipe bends with narrow radii cannot be avoided in the case of interposed pneumatic entry systems, which largely cancel out the advantage of a more uniform distribution of the fuel particles previously achieved with the pneumatics.
Der Erfindung liegt daher die Aufgabe zugrunde, ein Kohleneintragsystem für Kohlenstaubbrenner und -Reaktoren zu schaffen, das einen gleichmäßigen Eintrittsstrom von Kohlenstaubpartikeln gewährleistet. Dabei geht die Erfindung von dem Gedanken aus, die zur Verbrennung bestimmten Kohlepartikel möglichst mit geringem Abstand zueinander in den Brenner bzw. Reaktor einzutragen, so daß jeder Kohlenstaubpartikel stets das für die Verbrennung optimale Sauerstoffangebot erhält. Dem trägt die aus der DE-A2654662 bekannte Dosiervorrichtung bereits teilweise Rechnung. Diese bekannte Dosiervorrichtung für einen Kohlenstaubeintrag besteht aus einem Wirbelbett mit einer durch das Wirbelbett geführten Gasleitung zum Reaktor, wobei die Leitung eine Öffnung aufweist. In der Wirbelschicht werden die Partikel vereinzelt, so daß aneinander hängende Partikelklumpen den Materialverlust nicht stören können. Gleichwohl schließt auch die Wirbelschicht nicht aus, daß im Wirbelbett auch Schwankungen auftreten, die aber anderer Art sind. Diese Schwankungen jetreffen sowohl die Dichte des Bettes als auch den Druck und resultieren aus der Betriebsführung des Wirbelbettes. Bei ständig offener Leitung vom Wirbelbett zum Feuerungsraum bzw. Reaktionsraum pflanzen sich die aus der Betriebsführung des Wirbelbettes ergebenden Schwierigkeiten weitgehend ungehindert in den Feuerungsraum bzw. Reaktionsraum fort. Nach der Erfindung wird die Öffnung der durch das Wirbelbett führenden Leitung intermittierend geschlossen bzw. wieder geöffnet, so daß der Materialfluß zwar zerhackt aber im Mittel gleichmäßiger wird. Dabei zeigt sich eine vorteilhafte Möglichkeit zur Regelung des Materialflusses, indem durch Änderung der Öffnungsintervalle der Materialfluß bei gleichbleibender Betriebsführung des Wirbelbettes in weiten Grenzen beliebig erhöht oder verringert werden kann. Das ist zur optimalen Betriebsführung des Wirbelbettes von außerordentlichem Vorteil.The invention is therefore based on the object of providing a coal entry system for coal dust burners and reactors which ensures a uniform inlet flow of coal dust particles. The invention is based on the idea of entering the coal particles intended for combustion as close as possible to one another in the burner or reactor so that each coal dust particle always receives the optimal oxygen supply for the combustion. The metering device known from DE-A2654662 already partially takes this into account. This known metering device for coal dust input consists of a fluidized bed with a gas line through the fluidized bed to the reactor, the line having an opening. The particles are separated in the fluidized bed so that clumps of particles attached to one another cannot interfere with the loss of material. Nevertheless, the fluidized bed does not rule out the possibility of fluctuations occurring in the fluidized bed which are of a different type. These fluctuations affect both the density of the bed and the pressure and result from the operational management of the fluidized bed. With a continuously open line from the fluidized bed to the furnace or reaction space, the difficulties arising from the operational management of the fluidized bed propagate largely unhindered into the furnace or reaction space. According to the invention, the opening of the line leading through the fluidized bed is intermittently closed or opened again, so that the material flow is chopped up but on average becomes more uniform. This shows an advantageous possibility for regulating the material flow in that, by changing the opening intervals, the material flow can be increased or decreased within wide limits while operating the fluidized bed. This is an extraordinary advantage for optimal operation of the fluidized bed.
Außer mit Luft bzw. Sauerstoff können die Kohlenstaubpartikel auch mit Öl oder anderem Verbrennungsgas in dem Wirbelbett umhüllt werden, da das Wirbelbett zugleich eine überaus geeignete Mischvorrichtung darstellt. Bei entsprechend niedrigen Temperaturen kann auch flüssiger Sauerstoff mit den Kohlenstaubpartikeln vermischt werden. Andererseits ermöglicht das Wirbelbett auch eine Vorwärmung der Kohlenstaubpartikel durch teilweise Verbrennung und/ oder Zuführung geeigneter Heißgase.In addition to air or oxygen, the coal dust particles can also be encased in the fluidized bed with oil or other combustion gas, since the fluidized bed is also an extremely suitable mixing device. At correspondingly low temperatures, liquid oxygen can also be mixed with the coal dust particles. On the other hand, the fluidized bed also enables the coal dust particles to be preheated by partial combustion and / or supply of suitable hot gases.
Irr der Zeichnung ist ein Ausführungsbeispiel der Erfindung dargestellt. Es zeigt :
- eine Eintragsvorrichtung mit einer durch Rohrleitung und rotierende Lochscheibe gebildeten Dosiervorrichtung.
- an entry device with a metering device formed by pipeline and rotating perforated disk.
Nach Figur 1 werden die für einen nicht dargestellten Brenner bestimmten Kohlenstaubpartikel in einem Behälter 1 mittels eingeblasener Luft fluidisiert. Die Kohlenstaubpartikel werden von oben über eine schematisch dargestellte, regelbare Zellenschleuse 2 kontinuierlich in den Behälter 1 gefördert. Die Luft tritt durch eine Luftzuführungsleitung 3 unten in den Behälter 1 und verwirbelt die sich in den Behälter 1 befindenden Kohlenstaubpartikel.According to FIG. 1, the coal dust particles intended for a burner (not shown) are fluidized in a container 1 by means of blown-in air. The coal dust particles are continuously conveyed into the container 1 from above via a schematically illustrated,
Durch den Behälter 1 führt eine Brennerleitung 4. Die Brennerleitung führt von dem Behälter 1 zu dem nicht dargestellten Brenner. Die Brennerleitung 4 besitzt innerhalb des Behälters eine Aussparung, die durch eine drehbeweglich angeordnete Lochscheibe 5 ausgefüllt wird. Anstelle der Lochscheibe kann auch ein rotierender Zylinder Verwendung finden. Maßgebend ist, daß sich in dem rotierenden Körper Durchgangslöcher befinden, in die die im Behälter 1 verwirbelten Kohlenstaubpartikel eindringen können. Das bedingt eine ausreichende Verweilzeit der Durchgangslöcher außerhalb der Brennerleitung 4. Die Verweilzeit ergibt sich aus der Drehzahl der Lochscheibe 5 und deren Durchmesser, der ein Mehrfaches des Durchmessers der Brennerleitung 4 beträgt.A
In den Durchgangslöchern der rotierenden Lochscheibe werden die eingedrungenen Kohlenstaubpartikel in die Brennerleitung 4 getragen und dort mittels in die Brennerleitung 4 eingespeister Verbrennungsluft zum Brenner ausgetragen.In the through holes of the rotating perforated disk, the carbon dust particles that have penetrated are carried into the
Der Förderstrom der erfindungsgemäßen Eintragvorrichtung nach Figur 1 läßt sich durch Drehzahländerung der rotierenden Lochscheibe stufenlos verändern.The flow of the A according to the invention Carrying device according to Figure 1 can be changed continuously by changing the speed of the rotating perforated disc.
Claims (6)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT81103220T ATE22605T1 (en) | 1981-04-29 | 1981-04-29 | COAL DUST ENTRY. |
| EP81103220A EP0063629B1 (en) | 1981-04-29 | 1981-04-29 | Coal dust supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP81103220A EP0063629B1 (en) | 1981-04-29 | 1981-04-29 | Coal dust supply |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP83111807.0 Division-Into | 1981-04-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0063629A1 EP0063629A1 (en) | 1982-11-03 |
| EP0063629B1 true EP0063629B1 (en) | 1986-10-01 |
Family
ID=8187683
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP81103220A Expired EP0063629B1 (en) | 1981-04-29 | 1981-04-29 | Coal dust supply |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0063629B1 (en) |
| AT (1) | ATE22605T1 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3260457D1 (en) * | 1981-06-09 | 1984-08-30 | Coal Industry Patents Ltd | System for distributing particulate material |
| DE3317404A1 (en) * | 1983-05-13 | 1984-11-22 | Ruhrkohle-Carborat GmbH, 4152 Kempen | CARBON DUST BURNER |
| DE3617352A1 (en) * | 1986-05-23 | 1987-11-26 | Ruhrkohle Carborat Gmbh | COMPRESSED AIR FEEDING AND DOSING DEVICE |
| DE102008007033A1 (en) * | 2008-01-31 | 2009-08-06 | Siemens Aktiengesellschaft | Dosing system |
| DE102008014475A1 (en) * | 2008-03-17 | 2009-11-12 | Uhde Gmbh | Method and device for the metered removal of a fine to coarse-grained solid or solid mixture from a storage container |
| CN111964041A (en) * | 2020-08-26 | 2020-11-20 | 界首市华盛塑料机械有限公司 | Energy supply mechanism and boiler auxiliary machine based on same |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT92107B (en) * | 1918-11-26 | 1923-04-10 | Comb E Economica Societa Anoni | Pulverized fuel combustion. |
| DE393345C (en) * | 1921-05-27 | 1924-04-08 | Arbed | Device for mixing fuel and primary air in pulverized coal firing |
| DE456237C (en) * | 1924-03-11 | 1928-02-22 | Int Comb Eng Corp | Process for producing a fuel dust air mixture by introducing the same into a fire chamber |
| NL7514128A (en) * | 1975-12-04 | 1977-06-07 | Shell Int Research | METHOD AND EQUIPMENT FOR PARTIAL COMBUSTION OF CARBON POWDER. |
-
1981
- 1981-04-29 AT AT81103220T patent/ATE22605T1/en not_active IP Right Cessation
- 1981-04-29 EP EP81103220A patent/EP0063629B1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| ATE22605T1 (en) | 1986-10-15 |
| EP0063629A1 (en) | 1982-11-03 |
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