EP2151523A1 - Infrarot-Strahler - Google Patents
Infrarot-Strahler Download PDFInfo
- Publication number
- EP2151523A1 EP2151523A1 EP09165020A EP09165020A EP2151523A1 EP 2151523 A1 EP2151523 A1 EP 2151523A1 EP 09165020 A EP09165020 A EP 09165020A EP 09165020 A EP09165020 A EP 09165020A EP 2151523 A1 EP2151523 A1 EP 2151523A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- infrared radiator
- bars
- cross
- radiator according
- section
- 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.)
- Granted
Links
- 238000002156 mixing Methods 0.000 claims abstract description 7
- 238000002485 combustion reaction Methods 0.000 claims abstract description 5
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 3
- 239000000956 alloy Substances 0.000 claims abstract description 3
- YXTPWUNVHCYOSP-UHFFFAOYSA-N bis($l^{2}-silanylidene)molybdenum Chemical compound [Si]=[Mo]=[Si] YXTPWUNVHCYOSP-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229910021344 molybdenum silicide Inorganic materials 0.000 claims abstract description 3
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 3
- 239000000446 fuel Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 2
- 238000005422 blasting Methods 0.000 claims 1
- 238000007373 indentation Methods 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 239000004020 conductor Substances 0.000 abstract description 2
- -1 iron-chromium-aluminum Chemical compound 0.000 abstract 1
- 239000000203 mixture Substances 0.000 description 5
- 239000012530 fluid Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001513 hot isostatic pressing Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
- D21F5/001—Drying webs by radiant heating
- D21F5/002—Drying webs by radiant heating from infrared-emitting elements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/12—Radiant burners
- F23D14/14—Radiant burners using screens or perforated plates
- F23D14/148—Radiant burners using screens or perforated plates with grids, e.g. strips or rods, as radiation intensifying means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/12—Radiant burners
- F23D14/14—Radiant burners using screens or perforated plates
- F23D14/145—Radiant burners using screens or perforated plates combustion being stabilised at a screen or a perforated plate
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C3/00—Stoves or ranges for gaseous fuels
- F24C3/04—Stoves or ranges for gaseous fuels with heat produced wholly or partly by a radiant body, e.g. by a perforated plate
- F24C3/042—Stoves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
- F23D2900/00003—Fuel or fuel-air mixtures flow distribution devices upstream of the outlet
Definitions
- the invention relates to a heated with a combustible fluid, designed as a surface radiator infrared radiator according to the preamble of claim 1.
- IR emitters Such infrared emitters - hereafter called “IR emitters” for short - are known to be used in systems which serve to dry material webs, for example paper or board webs.
- FR 0 539 278 A1 shows such an IR emitter. He is heated by gas. Instead of gas but also heating with liquid fuels is possible.
- gas and air streams are mixed in a mixing chamber to a combustible mixture and then passed through a gas-permeable plate in a combustion chamber. There ignites the gas mixture and heats a Vorstrahlianu, which is formed of cylindrical ceramic rods having a circular contour in cross-section. Temperatures of 1100 ° C are reached.
- VorstrahlSuperV Vorstrahlscale
- the invention has for its object to increase the efficiency of IR radiators, i. to better utilize the energy stored in the combustible mixture.
- the bars (7) of the Vorstrahl stresses (6) at least over most of their length have a cross-section whose contour at least on a partial circumference stretch-increasing deviations, in particular depressions and / or elevations, of its basic geometric shape.
- rods are used in which the contour of the rod cross-sections is axially symmetrical, at least over part of the circumference, ie the rods have grooves or ribs in a preferably axial direction at least over part of their cross-sections.
- the rods can be made of solid or tube material. Silicon carbide (preferred), molybdenum silicide and FeCrAl heating conductor alloys may be mentioned by way of example. If the manufacturing capabilities allow it, a finned tube would be a particularly preferred element because the thermal inertia of the system could be further reduced in this way.
- Fig. 1 shows an infrared radiator 1 for gaseous or liquid fuels.
- an opening 2 through which combustible fluid, such as gas, and air enter a mixing chamber 3.
- the corresponding supply lines outside the infrared radiator are not shown in detail.
- the mixing chamber 3 is delimited by a gas-permeable plate 4, through which the mixture of combustible fluid and air flows into a combustion chamber 5, where it ignites and thereby heats the Vorstrahl stresses 6 formed from rods 7, which emits infrared rays in the sequence.
- Fig. 2 shows an infrared emitter 1 according to the invention in a section II-II Fig. 1 , Identical parts are provided with the same reference numerals.
- Fig. 3 illustrates a first embodiment of a rod according to the invention 7.
- the rod has a cylindrical outer contour in cross section and is provided on the periphery with teeth.
- Fig. 4 shows an alternative to the execution of the rod 7. It differs from the shape shown in Fig. Only by another embodiment of the "flanks" from.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Gas Burners (AREA)
- Drying Of Solid Materials (AREA)
- Resistance Heating (AREA)
Abstract
Description
- Die Erfindung betrifft einen mit einem brennbaren Fluid beheizten, als Flächenstrahler ausgebildeten Infrarot-Strahler gemäß dem Oberbegriff des Anspruchs 1.
- Derartige Infrarot-Strahler - nachstehend kurz "IR-Strahler" genannt - werden bekanntermaßen in Systemen eingesetzt, die dem Trocken von Materialbahnen, beispielsweise Papier- oder Kartonbahnen, dienen.
FR 0 539 278 A1 - Der Erfindung liegt die Aufgabe zugrunde, den Wirkungsgrad von IR-Strahlern zu erhöhen, d.h. die in dem brennfähigen Gemisch gespeicherte Energie besser auszunutzen.
- Diese Aufgabe wird dadurch gelöst, dass die Stäbe (7) des Vorstrahlkörpers (6) zumindest über den größten Teil ihrer Länge einen Querschnitt aufweisen, dessen Kontur zumindest auf einem Teilumfang streckenvergrößernde Abweichungen, insbesondere Vertiefungen und/oder Erhöhungen, von seiner geometrischen Grundform aufweist.
- Versuche mit IR-Strahlern, deren Vorstrahlkörper aus erfindungsgemäßen Stäben gebildet sind, haben gezeigt, dass der Wirkungsgrad von IR-Strahler dieses Typs deutlich größer ist als derjenige herkömmlicher IR-Strahler. Vermutlich hängt das Ergebnis damit zusammen, dass sowohl die Wärmeaustausch- wie die Abstrahlflächen der neuen Stäbe trotz Beibehaltung der von den bekannten zylindrischen Stäbe her gewohnten Außendurchmessern vergrößert worden ist.
- Vorzugsweise setzt man zu diesem Zweck Stäbe ein, bei denen die Kontur der Stangenquerschnitte zumindest auf einem Teilumfang axialsymmetrisch gestaltet ist, die Stäbe also zumindest auf einem Teilumfang ihrer Querschnitte Nuten bzw. Rippen in vorzugsweise axialer Richtung aufweisen. Dabei sind im einzelnen mannigfache Ausführungsformen denkbar. In einer besonders bevorzugten Ausführungsform sind die Stäbe wie folgt gestaltet: Hauptdurchmesser (D) = 3 bis 8 mm, Abmessungen der Nuten/Finnen: a = 0,5 bis 10 mm, bevorzugt 1 bis 5 mm; b = 0,1 bis 5 mm, bevorzugt 0,3 bis 2 mm; c = 0,5 bis 10 mm, bevorzugt 0,1 bis 5 mm. Was für die Geometrie der Stäbe gilt, gilt entsprechend für deren Herstellungsverfahren: Hier kommen je nach dem Werkstoff der Stäbe verschiedene Verfahren in Betracht darunter u.a. Extrudieren und heißisostatisches Pressen. In allen Fällen ist auf eine sorgfältige Rundung der Kanten zu achten, um zu vermeiden, dass die Stäbe auf Grund von Kerbwirkungen Schaden nehmen. Die Stäbe können aus Voll- oder Rohrmaterial bestehen. Als Material seien beispielhaft Siliziumcarbid (bevorzugt), Molybdändsilizid und FeCrAl-Heizleiter-Legierungen genannt. Falls die Fertigungsmöglichkeiten es zulassen, wäre ein Rippenrohr eine besonders bevorzugtes Element, da sich die thermische Trägheit des Systems auf diese Weise noch weiter verringern ließe.
- Die Erfindung wird im folgenden anhand eines bevorzugten, vereinfacht dargestellten Ausführungsbeispiels in Verbindung mit den Zeichnungen näher beschrieben. Hierbei zeigen:
- Fig. 1
- eine schematische geschnittene Darstellung eines erfindungsgemäßen IR-Strahlers,
- Fig. 2
- einen Schnitt A-A aus der
Fig. 1 - Fig. 3
- einen ersten Querschnitt eines erfindungsgemäß gestalteten Stabes aus dem Vorstrahlkörper,
- Fig. 4
- einen weiteren Querschnitt eines erfindungsgemäßen Stabes aus dem Vorstrahlkörper.
-
Fig. 1 zeigt einen Infrarot-Strahler 1 für gasförmige oder flüssige Brennstoffe. An der Rückseite dieses Strahlers befindet sich eine Öffnung 2, durch die brennbares Fluid, beispielsweise Gas, und Luft in eine Mischkammer 3 gelangen. Die entsprechenden Zufuhrleitungen außerhalb des Infrarot-Strahlers sind nicht näher dargestellt. Die Mischkammer 3 wird durch eine gasdurchlässige Platte 4 begrenzt, durch die das Gemisch aus brennbarem Fluid und Luft in eine Brennkammer 5 strömt, wo es sich entzündet und dadurch den aus Stäben 7 gebildeten Vorstrahlkörper 6 aufheizt, das in der Folge Infrarot-Strahlen aussendet. -
Fig. 2 zeigt einen den erfindungsgemäßen Infrarot-Strahler 1 in einem Schnitt II-II ausFig. 1 . Gleiche Teile sind mit gleichen Bezugszeichen versehen. -
Fig. 3 veranschaulicht eine erste Ausführungsform eines erfindungsgemäßen Stabes 7. Der Stab besitzt im Querschnitt eine zylindrische Außenkontur und ist auf dem Umfang mit Zähnen versehen. -
Fig. 4 zeigt eine Alternative zur Ausführung des Stabes 7. Sie weicht von der in Fig. dargestellten Form nur durch eine andere Ausgestaltung der "Flanken" ab. - Es versteht sich, dass von den dargestellten Ausführungsformen in vielfacher Hinsicht abgewichen werden kann, ohne den Grundgedanken der Erfindung zu verlassen.
-
- 1
- Infrarot-Strahler
- 2
- Brennstoff/Luft-Zufuhr
- 3
- Mischkammer
- 4
- gasdurchlässige Platte
- 5
- Brennraum
- 6
- Vorstrahlkörper
- 7
- Stab
Claims (6)
- Als Flächenstrahler ausgebildeter Infrarot-Strahler (1) für gasförmige oder flüssige Brennstoffe mit einer Mischkammer (3) für Luft und Brennstoff, einer diese Mischkammer abschließenden gasdurchlässigen Platte (4) und einem sich daran anschließenden Brennraum (5), der durch einen Vorstrahlkörper (6) begrenzt ist, der aus Stäben (7) besteht,
dadurch gekennzeichnet, dass
die Stäbe (7) des Vorstrahlkörpers (6) zumindest über den größten Teil ihrer Länge einen Querschnitt aufweisen, dessen Kontur zumindest auf einem Teilumfang streckenvergrößernde Abweichungen, ins besondere Vertiefungen und/oder Erhöhungen, von seiner geometrischen Grundform aufweist. - Infrarot-Strahler gemäß Anspruch 1,
dadurch gekennzeichnet, dass
die geometrische Grundform des Querschnitts elliptisch, insbesondere kreisförmig, oder polygonal ist oder einer Mischform aus beiden entspricht. - Infrarot-Strahler gemäß einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass
der Querschnitt der Stäbe (7) axialsymmetrischen Abweichungen in Form von Nuten oder Finnen aufweist. - Infrarot-Strahler gemäß einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass
die Stäbe folgende Abmessungen haben: Hauptdurchmesser (D) = 3 bis 8 mm, Nuten/Finnen: a = 0,5 bis 10 mm, bevorzugt 1,0 bis 5 mm; b = 0,1 bis 5 mm, bevorzugt 0,3 bis 2 mm; c = 0,5 bis 10 mm, bevorzugt 1,0 bis 5 mm. - Infrarot-Strahler gemäß einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass
die Stäbe aus Voll- oder Rohrmaterial bestehen. - Infrarot-Strahler gemäß einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, dass
als Werkstoff für die Stäbe Siliziumcarbid, Molybdändsilizid oder FeCrAl in Heizleiter-Legierung verwandt wird.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102008041045A DE102008041045A1 (de) | 2008-08-06 | 2008-08-06 | Infrarot-Strahler |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2151523A1 true EP2151523A1 (de) | 2010-02-10 |
EP2151523B1 EP2151523B1 (de) | 2011-09-28 |
Family
ID=41226105
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09165020A Not-in-force EP2151523B1 (de) | 2008-08-06 | 2009-07-09 | Infrarot-Strahler |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2151523B1 (de) |
AT (1) | ATE526452T1 (de) |
DE (1) | DE102008041045A1 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2018197069A1 (de) * | 2017-04-28 | 2018-11-01 | Voith Patent Gmbh | Infrarot-strahler |
CN110524935A (zh) * | 2019-09-06 | 2019-12-03 | 乐清市冲天文具有限公司 | 一种可自动脱水压缩的废纸回收设备 |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009003276A1 (de) | 2009-05-20 | 2010-11-25 | Voith Patent Gmbh | Infrarot-Strahler |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB565200A (en) * | 1943-06-29 | 1944-10-31 | John Martin Blair | Improvements in or relating to gas fires and radiants |
EP0539278A1 (de) | 1991-10-25 | 1993-04-28 | Gaz De France | Strahlungsbrenner mit keramischem Schirm |
-
2008
- 2008-08-06 DE DE102008041045A patent/DE102008041045A1/de not_active Withdrawn
-
2009
- 2009-07-09 EP EP09165020A patent/EP2151523B1/de not_active Not-in-force
- 2009-07-09 AT AT09165020T patent/ATE526452T1/de active
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB565200A (en) * | 1943-06-29 | 1944-10-31 | John Martin Blair | Improvements in or relating to gas fires and radiants |
EP0539278A1 (de) | 1991-10-25 | 1993-04-28 | Gaz De France | Strahlungsbrenner mit keramischem Schirm |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2018197069A1 (de) * | 2017-04-28 | 2018-11-01 | Voith Patent Gmbh | Infrarot-strahler |
CN110524935A (zh) * | 2019-09-06 | 2019-12-03 | 乐清市冲天文具有限公司 | 一种可自动脱水压缩的废纸回收设备 |
Also Published As
Publication number | Publication date |
---|---|
ATE526452T1 (de) | 2011-10-15 |
EP2151523B1 (de) | 2011-09-28 |
DE102008041045A1 (de) | 2010-02-11 |
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