DE670517C - Pulverized coal firing - Google Patents

Pulverized coal firing

Info

Publication number
DE670517C
DE670517C DED69663D DED0069663D DE670517C DE 670517 C DE670517 C DE 670517C DE D69663 D DED69663 D DE D69663D DE D0069663 D DED0069663 D DE D0069663D DE 670517 C DE670517 C DE 670517C
Authority
DE
Germany
Prior art keywords
pulverized coal
combustion chamber
masonry
firing
duct
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
DED69663D
Other languages
German (de)
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.)
Deutsche Babcock and Wilcox Dampfkesselwerke AG
Original Assignee
Deutsche Babcock and Wilcox Dampfkesselwerke AG
Publication date
Priority to DED69663D priority Critical patent/DE670517C/en
Application granted granted Critical
Publication of DE670517C publication Critical patent/DE670517C/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K1/00—Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K2201/00—Pretreatment of solid fuel
    • F23K2201/10—Pulverizing
    • F23K2201/1006—Mills adapted for use with furnaces

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Portable Nailing Machines And Staplers (AREA)

Description

Kohlenstaubfeuerung Die Erfindung betrifft eitle Kohlenstaubfeuerung mit Zuführung v oii Luft .durch Kanäle im Mauerwerk der Brennkammer und mit zwei hintereinandergeschalteten Gebläsen. Bei derartigen Anlagen tritt die Erscheinung auf, daß je nach den Druckverhältnissen ein Gasaustausch zwischen Brennkammer und Luftkanal stattfindet. Gewöhnlich herrscht im Luftkanal Überdruck. Dann tritt durch Undichtigkeiten im Mauerwerk Luft in die Brennkammer und stört die Flammenausbildung. Hat der Kanal Unterdruck, so saugt er durch die Fugen des Mauerwerkes Feuergase an und versetzt sich daher sehr bald mit Flugasche. Erfindungsgemäß werden diese Mängel dadurch behoben, daß der gefährdete Kanalteil an seinen Enden mit Regelklappen versehen wird, welche gestatten, bei jederBelastung den mittleren Druck im Kanalquerschnitt dem Druck in der Brennkammer anzugleichen.Powdered Coal Firing The invention relates to pulverized coal firing with supply of air. through ducts in the masonry of the combustion chamber and with two cascaded fans. The phenomenon occurs in such systems on that, depending on the pressure conditions, a gas exchange between the combustion chamber and Air duct takes place. Usually there is overpressure in the air duct. Then step through Leaks in the masonry air into the combustion chamber and interferes with the formation of the flame. If the duct is underpressure, it sucks in fire gases through the joints in the masonry and is therefore very soon mixed with fly ash. According to the invention, these Defects corrected by the fact that the endangered part of the sewer with control valves which allow the mean pressure in the channel cross-section at every load to match the pressure in the combustion chamber.

Als Ausführungsbeispiel ist in der Zeichnung ein Teil eines Ouerschnittes durch eine Brennkammer mit Mühlenfeuerung dargestellt. Der Lüfter i drückt die Verbrennungsluft durch den Lufterhitzer 2 in den Blechkanal 3, der sie mit hoher Pressung zu den Zweiluftdüsen führt. Eine Abzweigung führt zur weiteren Erwärmung Luft durch den Kanal 4 in der Wand der Brennkammer 5 zum Gasn -Iischr aum 6 und aus diesem durch die axiale Öffnung 7 in die Mahlkammer ä. Die Luft wird zur weiteren Aufwärmung mit Feuergasen gemischt, welche durch Kanal 9 in regelbarer Menge angesaugt werden. Den Unterdruck zur Gasrücksaugung liefern die auf der Mühlenwelle angebrachten ventilatorartigenFlügel. Der imMauerwerkverlaufende Kanal 4 ist an seinen Enden mit Regelklappen io und i i versehen, mit welchen es möglich ist, bei allen Belastungen und trotz Gasrücksaugung den mittleren Unterdruck im Kanal d. ungefähr gleich dem in der Brennkammer zu halten. Die Steuerung kann auch selbsttätig erfolgen in Abhängigkeit vom Druck in der Brennkammer.As an exemplary embodiment, part of a cross section is shown in the drawing represented by a combustion chamber with mill firing. The fan i pushes the combustion air through the air heater 2 in the sheet metal duct 3, which they with high pressure to the Dual air nozzles leads. A branch leads to further heating through the air Channel 4 in the wall of the combustion chamber 5 to Gasn -Iischr aum 6 and from this through the axial opening 7 in the grinding chamber ä. The air is used for further heating mixed with fire gases, which are sucked in through channel 9 in an adjustable amount. The vacuum for gas back suction is provided by the fan-like blades attached to the mill shaft. The duct 4 running in the masonry is at its ends with control flaps io and i i provided with which it is possible, with all loads and despite gas back suction the mean negative pressure in the duct d. about the same as in the combustion chamber. The control can also take place automatically depending on the pressure in the combustion chamber.

Claims (2)

PATrNTANSPRÜCIIR: i. Kohlenstaubfeuerung, insbesondere Mühlenfeuerung, mit Zuführung der Verbrennungsluft durch im Mauerwerk der Brennkammer liegende Kanäle und mit zwei durch diese Kanäle hintereinandergeschalteten Lüftern, wovon einer durch eine selbstventilierende Mühle ersetzt sein kann, dadurch gekennzeichnet, daß die Mauerwerkskanäle (q.) an ihren Enden mit Regelvorrichtungen (i o, i i) versehen sind, mit deren Hilfe der Druck im Mauerwerkskanal gleich dem in der Brennkammer gehalten wird. PATENT CLAIM: i. Pulverized coal firing, especially mill firing, with the supply of combustion air through ducts in the brickwork of the combustion chamber and with two fans connected in series through these channels, one of which can be replaced by a self-ventilating mill, characterized in that that the masonry ducts (q.) are provided at their ends with regulating devices (i o, i i) with the help of which the pressure in the masonry duct is equal to that in the combustion chamber is held. 2. Kohlenstaubfeuerung nach Anspruch i mit Gasrücksaugung, dadurch gekennzeichnet, daß auch der Ansaugkanal für die Feuergase (9) mit einer Regelvorrichtung versehen ist.2. pulverized coal furnace according to claim i with gas back suction, characterized characterized in that the intake duct for the fire gases (9) also has a control device is provided.
DED69663D Pulverized coal firing Expired DE670517C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DED69663D DE670517C (en) Pulverized coal firing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DED69663D DE670517C (en) Pulverized coal firing

Publications (1)

Publication Number Publication Date
DE670517C true DE670517C (en) 1939-01-24

Family

ID=7060352

Family Applications (1)

Application Number Title Priority Date Filing Date
DED69663D Expired DE670517C (en) Pulverized coal firing

Country Status (1)

Country Link
DE (1) DE670517C (en)

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