EP0772010B1 - Brennerbeheizter Lufterhitzer - Google Patents
Brennerbeheizter Lufterhitzer Download PDFInfo
- Publication number
- EP0772010B1 EP0772010B1 EP96117521A EP96117521A EP0772010B1 EP 0772010 B1 EP0772010 B1 EP 0772010B1 EP 96117521 A EP96117521 A EP 96117521A EP 96117521 A EP96117521 A EP 96117521A EP 0772010 B1 EP0772010 B1 EP 0772010B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- air
- combustion chamber
- branch stream
- branch
- heated
- 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 - Lifetime
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
- F26B21/002—Drying-air generating units, e.g. movable, independent of drying enclosure heating the drying air indirectly, i.e. using a heat exchanger
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H3/00—Air heaters
- F24H3/02—Air heaters with forced circulation
- F24H3/06—Air heaters with forced circulation the air being kept separate from the heating medium, e.g. using forced circulation of air over radiators
- F24H3/08—Air heaters with forced circulation the air being kept separate from the heating medium, e.g. using forced circulation of air over radiators by tubes
- F24H3/087—Air heaters with forced circulation the air being kept separate from the heating medium, e.g. using forced circulation of air over radiators by tubes using fluid fuel
Definitions
- the invention relates to an air heating system for indirect heating of air for drying plants after the Preamble of claim 1 and a method for indirect heating of air for drying systems.
- the first partial air flow flows across the combustion chamber, forms on the entry of the first partial air flow facing away from the combustion chamber with a lee area insufficient air movement on the lateral surface of the Combustion chamber, so that in this area a limitation of Surface temperature not to a maximum of 700 ° C can be ensured.
- a good flow around the Combustion chamber is essential because the flame is in the Combustion chamber has a temperature above 1000 ° C and therefore Wall temperatures of over 700 ° C can occur.
- FR-A-1.138.276 describes a burner whose exhaust gases be passed through a heat exchanger.
- the combustion chamber is with helically arranged rib plates as well an outer jacket around the rib plates, so that a helical flow channel around the Combustion chamber forms around.
- a first airflow to warming air hits the end of the helical Rib up and flow around the combustion chamber while a second Airflow of the air to be heated in counterflow to the Tubes of the heat exchanger is performed.
- the invention lies in the The task is based on a single, compact device ensure intensive flue gas cooling and at the same time the surface temperature of all with the drying air in To keep the coming outer surfaces as small as possible.
- Effective cooling both in the combustion chamber generated flue gas in a flue gas heat exchanger, as the outer surface of the combustion chamber can also be achieved because drying air is in contact with them occurs that has not yet been upstream Heat exchange step has been preheated. This stands for the cooling of the outer surface of the combustion chamber greatest possible driving temperature gradient available, so that an effective cooling of the outer surface is possible.
- the second partial air stream to be heated Drying air along the outer surface of the Combustion chamber, so that there are no areas with insufficient Form overflow that can overheat, causing Wall temperatures can arise that are above the maximum tolerable lie.
- the drying air to be heated without mutual Mixing can be performed in the air heating system in a simple and convenient way, for example by Adjust the pressure drop of one or both Partial air flows, the mass fraction of the two partial air flows be regulated
- the air heating system has one Mass flow ratio adjusting device of the two Partial air flows of the drying air to be heated.
- the air heating system can be targeted to different Operating areas to be adjusted. If, for example Drying air at a higher or lower temperature should be generated, this can be done by setting the Mass flow ratio of the two partial air flows reached be without causing unwanted overheating can come inside the air heating system.
- the adjustment device is an axial one sliding baffle.
- the axially movable Baffle plate narrows or widens the outlet cross section of the flow channel one of the two partial air flows on Leaves the air heating system and thus controls the Pressure loss of the respective partial air flow. This is possible because the first and the second partial air flow the drying air to be heated without mutual Mixing and thus without the possibility of one mutual pressure equalization in the air heating system be performed.
- the mass fraction of the second is advantageous Partial airflow less than the mass fraction of the first Partial air flow in the air to be heated.
- the combustion chamber is advantageously essentially the main extension is rotationally symmetrical the combustion chamber in the direction of the axis of rotation of the Combustion chamber. Due to the rotationally symmetrical shape of the Combustion chamber is flow around in the longitudinal direction, ie. H. in Direction of the axis of rotation easier.
- the second partial air flow is preferably the warming drying air in a closed Flow channel guided, which surrounds the combustion chamber, wherein the closed flow channel ribs or fins has that on the outer surface of the combustion chamber are formed and in the main flow direction of the second Extend partial air flow within the flow channel.
- the flue gas heat exchanger comprises Pipe bundle in which the flue gases flow, the first Partial air flow of the drying air to be heated in cross-counterflow is guided around the tube bundle.
- the cross-countercurrent flow of the drying air to the flue gas the best possible use of those used in the burner Primary energy can be achieved by not yet preheated air in heat exchange with the outlet side End of the flue gas pipes is brought.
- the air heating system shown in Fig. 1 is generally referred to by reference number 10.
- the Air heating system 10 has a suitable housing 12, its construction with different housing covers, flanges and load-bearing components both ensure that the Air heating system 10 on the stand area 14 as well allows easy access to the individual components, wait for the air heating system 10 and if necessary to be able to clean.
- An essential component of the air heating system 10 represents the combustion chamber 16 with a burner 18 connected by the combustion of a liquid or gaseous fuel produces flue gases.
- the tubes of the tube bundle of the flue gas heat exchanger 22 are exposed to the flue gases A and end in one Flue gas outlet 24, from which the flue gases are suitable Way to be dissipated.
- Flue gas outlet 24 from which the flue gases are suitable Way to be dissipated.
- Example are the flue gases in a tube bundle loop led and the flow direction of the flue gases on the one hand through a specific bending of the individual pipes in the Deflection area 25 and on the other hand by interposing a deflection bell 26 changed.
- the tube bundle of the flue gas heat exchanger 22 runs ahead the exit from the air heating system 10 along a Air inlet 28 through which a partial air flow to warming air enters the air heating system 10.
- not yet preheated air is divided into two partial air flows B and C split up independently of each other by the Air heating system 10 flow and only after the outlet mixed together from the air heating system 10 become.
- the separation of the two partial air flows can be reduced to one done in any way, for example by installation of separating and air guiding elements, which are in the housing 12 are arranged.
- a wall of the deflection bell 26 of the Flue gas heat exchanger 22 is part of this required separating elements.
- the first partial air flow B flows around the tube bundle of the Flue gas heat exchanger 22.
- the first leaves Partial air flow B after flowing around the tube bundle Flue gas heat exchanger 22 through the air heating system 10 Exit openings 30 to which suitable facilities can connect to the from the outlet openings 30th emerging, heated first partial air stream B. and continue to transport them as intended.
- the second partial air flow C of the air to be heated is completely separate from the first partial air flow B through the Air heater and is used in a suitable manner, for example via air guide plates 32 to the combustion chamber 16 passed, whereupon the second partial air flow C into one Chamber jacket 34 occurs, which surrounds the combustion chamber 16.
- the chamber jacket 34 is designed so that the second Partial air flow C the outer surface of the combustion chamber 16 completely flows around.
- Die Dimensioning of the laminated combustion chamber size is aimed according to the requirement that the flue gases in the Combustion chamber to be cooled down so far that Combustion chamber outlet 20, at which the flue gases enter the Pipe bundles of the flue gas heat exchanger 22 enter Pipe surface temperature not a temperature of 700 ° C exceeds.
- the second partial air flow C is parallel to Longitudinal axis of the preferably substantially cylindrical formed combustion chamber 16 through the chamber jacket 34 performed and leaves the air heating system 10 on the end of the combustion chamber 16 remote from the burner.
- the second partial air flow C is preferably at the outlet from the air heating system in two partial flows split, with a first substream Air heating system essentially in the direction of Flow through the chamber jacket 34 leaves, the other stream however, is deflected and the distant, preferably bell-shaped front end of the Combustion chamber 16 flows around before it reaches the air heating system leaves.
- Moving the baffle plate 38 regulates the Flow resistance at the outlet of the second partial air flow C from the air heating system 10. Because of the inside the air heating system 10 completely separate Flow control of the two partial air streams B and C acts the outlet pressure loss of the second Partial air flow C on the distribution of the two Partial air flows at the air inlet 28. The stronger with help the baffle plate 38 the outlet cross section for the second Partial air flow C is narrowed, the smaller the second Partial air flow C, because the pressure drop with decreasing Flow velocity of the second partial air flow C decreases and the air to be dried still at the air inlet 28 exists together, d. H. the pressure at the air inlet 28 for both partial air flows B and C are the same size.
- the Dimensioning of the laminated combustion chamber size directs what the flue gases in the combustion chamber so far be cooled that also at the flue gas inlet in the Tube bundle the tube surface temperature is not 700 ° C by using the also cold, second partial air flow C for cooling the combustion chamber 16 these are dimensioned smaller and thus the entire Air heating system despite the optimal use of the used primary fuel energy more compact become.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Drying Of Solid Materials (AREA)
- Air Supply (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
- Direct Air Heating By Heater Or Combustion Gas (AREA)
Description
- Fig. 1
- ein Längsschnitt durch die Lufterhitzungsanlage mit schematisch eingezeichneten Pfeilen zur Verdeutlichung der Strömungsrichtung der Rauchgassowie Teilluftströme; und
- Fig. 2
- ein Querschnitt durch die Lufterhitzungsanlage gemäß Fig. 1 darstellt.
Claims (9)
- Lufterhitzungsanlage zur indirekten Erwärmung von Luft für Trocknungsanlagen mit:einer Trennvorrichtung, die den zu erwärmenden Luftstrom in zwei Teilluftströme, einen ersten Teilluftstrom (B) und einen zweiten Teilluftstrom (C), die ohne gegenseitige Vermischung innerhalb der Lufterhitzungsanlage geführt werden, aufteilt;einem Rauchgas-Wärmetauscher (22), der die in einer Brennkammer (16) erzeugten Rauchgase (A) in wärmeübertragenden Kontakt zu der zu erwärmenden Luft bringt, wobei der Rauchgas-Wärmetauscher (22) mit dem noch nicht erwärmten ersten Teilluftstrom (B) im Kreuz-Gegenstrom beaufschlagt wird; undeiner Brennkammer (16), deren Mantelfläche von dem noch nicht erwärmten zweiten Teilluftstrom (C) vollständig und gleichmäßig umströmt wird;die Lufterhitzungsanlage eine Einstellvorrichtung zum Einstellen des Massenstromverhältnisses der zwei Teilluftströme besitzt, wobeidie Einstellvorrichtung eine axial verschiebbare Prallscheibe ist.
- Lufterhitzungsanlage nach Anspruch 1,
dadurch gekennzeichnet, daß die Brennkammer (16) im wesentlichen rotationssymmetrisch geformt ist und die Haupterstreckung der Brennkammer in Richtung der Rotationsachse der Brennkammer liegt. - Lufterhitzungsanlage nach Anspruch 2,
dadurch gekennzeichnet, daß
der die Brennkammer umströmende zweite Teilluftstrom (C) in Richtung der Rotationsachse der Brennkammer geführt wird. - Lufterhitzungsanlage nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, daß
der zweite Teilluftstrom (C) in einem geschlossenen Strömungskanal (34) geführt wird, der die Brennkammer (16) umgibt. - Lufterhitzungsanlage nach Anspruch 4,
dadurch gekennzeichnet, daß
der geschlossene Strömungskanal Rippen oder Lamellen (36) aufweist, die an der äußeren Mantelfläche der Brennkammer gebildet sind und sich in Hauptströmungsrichtung des zweiten Teilluftstromes (C) innerhalb des Strömungskanals (34) erstrecken. - Lufterhitzungsanlage nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, daß
der Rauchgas-Wärmetauscher (22) ein Rohrbündel umfaßt, in dem die Rauchgase (A) strömen. - Verfahren zur indirekten Erwärmung von Luft für Trocknungsanlagen umfassend die folgenden Schritte:Trennen des zu erwärmenden Luftstromes in zwei Teilluftströme, einen ersten Teilluftstrom und einen zweiten Teilluftstrom;Erhitzen des noch nicht erwärmten ersten Teilluftstromes durch Wärmeaustausch mit einem Rauchgas-Wärmetauscher, wobei der erste Teilluftstrom im Kreuz-Gegenstrom zum heißen Rauchgas geführt wird;Erhitzen des noch nicht erwärmten zweiten Teilluftstromes durch Wärmeaustausch mit der Mantelfläche einer Brennkammer, wobei der zweite Teilluftstrom die Brennkammer vollständig umströmt;Einstellen des Massenstromverhältnisses zwischen erstem Teilluftstrom und zweitem Teilluftstrom durch Veränderung des Druckverlustes eines der beiden Teilluftströme, den dieser bei dessen Durchtritt durch die Lufterhitzungsanlage erleidet; undGetrennter Abzug des ersten Teilluftstromes und des zweiten Teilluftstromes aus der Lufterhitzungsanlage.
- Verfahren zum Erwärmen von Luft in einer Lufterhitzungsanlage gemäß Anspruch 7,
dadurch gekennzeichnet, daß
der zweite Teilluftstrom in einem die Brennkammer umgebenden Strömungskanal entlang wärmeabgebender Lamellen geführt wird. - Verfahren zum Erwärmen von Luft in einer Lufterhitzungsanlage gemäß Anspruch 7 oder 8,
dadurch gekennzeichnet, daß
der Massenanteil des zweiten Teilluftstromes (C) an Trocknungsluft kleiner als der Massenanteil des ersten Teilluftstromes (B) an Trocknungsluft eingestellt wird.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19541035A DE19541035C1 (de) | 1995-11-03 | 1995-11-03 | Brennerbeheizter Lufterhitzer |
DE19541035 | 1995-11-03 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0772010A1 EP0772010A1 (de) | 1997-05-07 |
EP0772010B1 true EP0772010B1 (de) | 2001-05-23 |
Family
ID=7776560
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96117521A Expired - Lifetime EP0772010B1 (de) | 1995-11-03 | 1996-10-31 | Brennerbeheizter Lufterhitzer |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0772010B1 (de) |
AT (1) | ATE201504T1 (de) |
DE (1) | DE19541035C1 (de) |
DK (1) | DK0772010T3 (de) |
ES (1) | ES2157384T3 (de) |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19937901C2 (de) * | 1999-08-11 | 2001-06-21 | Eisenmann Kg Maschbau | Trockner für eine Lackieranlage |
IT249409Y1 (it) * | 2000-08-08 | 2003-05-07 | Piovan Spa | Struttura di scambiatore aria-aria particolarmente per essicatoi di materia plastica in granuli per stampaggio. |
DE10125960A1 (de) * | 2001-05-29 | 2002-12-05 | Brueckner Trockentechnik Gmbh | Vorrichtung zur Behandlung von textilen Warenbahnen |
EP1262726A1 (de) * | 2001-05-29 | 2002-12-04 | Brückner Trockentechnik GmbH & Co. KG | Vorrichtung zur Behandlung von textilen Warenbahnen |
GB2402465B (en) * | 2003-05-27 | 2005-12-07 | * Robinson Edwin | A split-flow heat exchanger |
CN103884093B (zh) * | 2012-12-20 | 2016-02-24 | 岳阳远东节能设备有限公司 | 一种新型全钢结构直燃夹套式热风炉 |
CN103499193B (zh) * | 2013-10-15 | 2015-04-01 | 李菊泉 | 干燥房专用热风炉 |
CN104006647A (zh) * | 2014-06-11 | 2014-08-27 | 李雪奎 | 一种换热器 |
CN106319908B (zh) * | 2015-06-16 | 2020-02-14 | 青岛海尔智能技术研发有限公司 | 干衣机 |
DE102015008253A1 (de) | 2015-06-26 | 2016-12-29 | Eisenmann Se | Wärmetauscher und Verfahren zum Betreiben eines Wärmtauschers |
CN105241212A (zh) * | 2015-09-18 | 2016-01-13 | 广西节得乐生物质能源科技有限公司 | 一种生物质颗粒燃烧烘干设备 |
CN106679174B (zh) * | 2016-12-29 | 2023-09-08 | 广东工业大学 | 高温热风炉 |
CN108645025B (zh) * | 2018-05-14 | 2020-10-16 | 哈尔滨工业大学达通热能工程有限公司 | 燃煤气热风炉 |
CN112856813A (zh) * | 2021-01-21 | 2021-05-28 | 济南宇弘热能设备有限公司 | 一种大型分体间接换热式燃气热风炉 |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2353606A (en) * | 1941-04-23 | 1944-07-11 | Watts Albert Edward | Hot-air furnace |
US2725051A (en) * | 1953-01-06 | 1955-11-29 | Delta Heating Corp | Forced air recirculation floor furnace |
US2737173A (en) * | 1953-08-11 | 1956-03-06 | Delta Heating Corp | Combustion type unit heater |
FR1138276A (fr) * | 1955-03-22 | 1957-06-12 | Générateur de fluide chaud | |
FR1353375A (fr) * | 1963-04-11 | 1964-02-21 | Breitenstein Gmbh J | Réchauffeur d'air |
CS159037B1 (de) * | 1972-06-12 | 1974-12-27 | ||
DE3039065C2 (de) * | 1980-10-16 | 1984-05-24 | Nordklima Lohner Klimatechnik GmbH, 2842 Lohne | Warmluft-Heizvorrichtung |
FR2522796A1 (fr) * | 1982-03-05 | 1983-09-09 | Sequipag | Procede et installation perfectionnes pour le sechage de matieres en grains |
DE3330924A1 (de) * | 1983-08-27 | 1985-03-07 | Hans Huras Gmbh, 6437 Kirchheim | Waermetauscher |
DE4308522A1 (de) * | 1993-03-17 | 1994-09-22 | Flucorrex Ag Flawil | Lufterhitzungsanlage zur indirekten Erwärmung von Luft für Trocknungsanlagen |
-
1995
- 1995-11-03 DE DE19541035A patent/DE19541035C1/de not_active Expired - Fee Related
-
1996
- 1996-10-31 ES ES96117521T patent/ES2157384T3/es not_active Expired - Lifetime
- 1996-10-31 EP EP96117521A patent/EP0772010B1/de not_active Expired - Lifetime
- 1996-10-31 DK DK96117521T patent/DK0772010T3/da active
- 1996-10-31 AT AT96117521T patent/ATE201504T1/de not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
EP0772010A1 (de) | 1997-05-07 |
DE19541035C1 (de) | 1997-06-12 |
DK0772010T3 (da) | 2001-07-30 |
ES2157384T3 (es) | 2001-08-16 |
ATE201504T1 (de) | 2001-06-15 |
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