EP0199032A2 - Installation pour assurer la séparation de courants de gaz d'atmosphères différentes - Google Patents

Installation pour assurer la séparation de courants de gaz d'atmosphères différentes Download PDF

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Publication number
EP0199032A2
EP0199032A2 EP86102870A EP86102870A EP0199032A2 EP 0199032 A2 EP0199032 A2 EP 0199032A2 EP 86102870 A EP86102870 A EP 86102870A EP 86102870 A EP86102870 A EP 86102870A EP 0199032 A2 EP0199032 A2 EP 0199032A2
Authority
EP
European Patent Office
Prior art keywords
furnace
section
return
channels
gas
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
Application number
EP86102870A
Other languages
German (de)
English (en)
Other versions
EP0199032A3 (en
EP0199032B1 (fr
Inventor
Friedherz Dipl.-Ing. Becker
Erwin König
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.)
Riedhammer GmbH and Co KG
Original Assignee
Rosenthal AG
Ludwig Riedhammer GmbH and Co KG
Riedhammer GmbH and Co KG
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.)
Filing date
Publication date
Application filed by Rosenthal AG, Ludwig Riedhammer GmbH and Co KG, Riedhammer GmbH and Co KG filed Critical Rosenthal AG
Publication of EP0199032A2 publication Critical patent/EP0199032A2/fr
Publication of EP0199032A3 publication Critical patent/EP0199032A3/de
Application granted granted Critical
Publication of EP0199032B1 publication Critical patent/EP0199032B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/30—Details, accessories or equipment specially adapted for furnaces of these types
    • F27B9/3005—Details, accessories or equipment specially adapted for furnaces of these types arrangements for circulating gases

Definitions

  • the invention relates to a device for ensuring the separation of gas flows of different atmospheres, in particular in different sections of an oven.
  • the tunnel-shaped furnace is divided into two zones with different gas atmospheres, the so-called heating or cleaning zone, which is followed by the reduction zone in the direction of transport of the goods.
  • the reduction zone While a strongly oxidizing atmosphere is set in the heating or cleaning zone, the reduction zone is distinguished by its reducing atmosphere, due to which, in particular, a reduction in the iron ions can be achieved and thus discoloration of the fuel can be prevented.
  • the problem here is the transition from the cleaning zone to the reduction zone. Due to the flow of the combustion gases in the reduction zone directed against the transport direction of the combustion material, these are also led into the cleaning zone upstream of the reduction zone (seen in the transport direction of the combustion material), so that no exact Separation is possible.
  • the temperature in the upper region of the furnace duct is always somewhat higher than in the lower region.
  • a sharp separation of the oxidizing zone from the reducing zone is not necessary possible; rather, a "reduction flag" always pulls into the oxidizing heating zone, which results in a loss of quality of the material to be burned.
  • the invention is now intended to offer a solution for separating the atmospheres in cavities, in particular in furnaces, the different atmospheres being able to be guided separately along a defined plane, if possible, even when the media are flowing.
  • a device With a device according to the invention, it is possible to selectively guide the combustion gases of one furnace section with a certain atmosphere, in such a way that they are subsequently returned to the first furnace section in a flow direction different from the original flow direction, the recirculated gases preferably in one Angle of about 90 degrees and thus returned to the furnace transversely to the original flow direction will.
  • the device according to the invention thus acts practically as a "flow brake", as a "curtain” to a second and possibly further furnace sections in which other atmospheres prevail.
  • An angle of 90 degrees will often prove to be particularly advantageous, but under certain circumstances there will also be areas of application in which the gases are returned with a flow component opposite to the original flow direction.
  • the extraction and return of the gas in a furnace section of a certain gas composition is achieved via a discharge channel running from this furnace section, which leads directly or indirectly into a return channel, a chimney being interposed to support the flow through these channels, which provides a corresponding "pull". It is advantageous if a blower is additionally arranged in the channel path.
  • An advantageous embodiment provides that high-speed burners are provided at the entry of the return duct into the relevant furnace section, which are designed or arranged as injector burners. Due to the high flow velocity of the burner flame, the combustion gases in the return duct are then sucked in, carried away and returned to the furnace chamber, as well as postprocessed burns. The resulting suction leads to the fact that more and more combustion gases are withdrawn from the return duct or the upstream exhaust duct and ultimately with it from the furnace and returned to the furnace in a direction offset from the original flow direction.
  • the entire device is located in the area of one furnace section with the defined gas atmosphere, but immediately in front of the other furnace section with a different atmosphere.
  • a further embodiment variant provides that a plurality of discharge and return ducts are provided which run into an intermediate collecting duct, slides being able to be provided in the individual ducts in order to be able to adjust the gas quantity flowing through.
  • the combustion gases can be sucked in as well as their subsequent afterburning.
  • the return preferably perpendicular to the original flow direction, ensures that combustion gases flowing in in the furnace channel against the transport direction of the material are stopped, so that they can no longer penetrate into the adjacent furnace section with a different furnace atmosphere.
  • the invention provides for the use of partition walls which reduce the furnace cross section.
  • these can be slidably provided from the ceiling into the furnace channel, specifically in the area of the reduction zone directly in front of the oxidation zone (as seen in the opposite direction of the goods).
  • the injector burners are then in turn arranged in front of the partition or walls so that the "flow brake" is built up in front of the partition or walls (again in each case seen against the transport direction of the goods).
  • the effectiveness of the device according to the invention can be further improved, in particular at high flow rates of the combustion gases in the furnace, by arranging various of these partition walls at a distance from one another and the injector burners in the furnace side walls being arranged opposite each other between the individual partition walls. In this way, quasi “chambers” are formed, in each of which there is a flow through the injector burners that is perpendicular to the transport direction of the goods.
  • the gas flow of one furnace section, which runs against the direction of transport of the goods, is stopped by several "flow brakes" arranged one behind the other.
  • Excess combustion gases can be drawn off via a chimney running from one or more of the channels.
  • the residual oxygen from the deflected combustion gases of one furnace section may be sufficient, the injector burners fire, which means that in this case no further fuel gases have to be supplied.
  • a gas measuring device can be provided at the separating point between the areas of different gas atmospheres, which is set to a specific target value and, when it is exceeded / undershot, regulates the slide positions, burner setting or dividing wall positions.
  • the invention makes it possible to achieve an effective separation of different gas atmospheres with extremely simple measures.
  • the device according to the invention is designed so that it can easily be retrofitted in already existing systems. Due to the improved separation of the different sections of different gas atmospheres, an improvement in the product quality of the material to be burned is achieved.
  • the furnace shown in the drawing is a tunnel furnace for smooth firing of porcelain, the furnace channel 10 of which is enclosed by the floor 11, the side walls 12, 13 and the ceiling 14 arranged above it.
  • the individual kiln cars (not shown) with the material to be burned arranged on them are led, starting from the kiln inlet, through the kiln channel 10 to the opposite kiln outlet, the transport plane of the product being identified in FIG. 1 by the line shown at 16.
  • the material passes through the furnace channel 10 in the illustration according to FIG. 1 from left to right, the heating or cleaning zone 19 extending up to the vertical dashed line 18 to which the reduction zone 17 is connected.
  • the device according to the invention for separating these two zones 17, 19 of different atmospheres is arranged in the area of the reduction zone 17, immediately before the heating zone 19 begins. Their arrangement results particularly well from FIG. 2, which shows two halved cross-sections through the furnace separated by the dash-dotted center line, the two cuts being taken at locations offset along the furnace duct.
  • an extraction duct 22 is provided which extends vertically upwards in the ceiling 14.
  • a horizontal slide 23 is arranged at a distance from the transition from the furnace duct 10 to the extraction duct 22, in such a way that it can be moved into the extraction duct 22 to reduce the cross-section thereof or to shut it off.
  • any other means for reducing the cross-section or for closing the exhaust duct 22 can of course also be provided.
  • the vertical section of the exhaust duct 22 then merges via a bend into a horizontal section which merges into an exhaust gas collecting duct 24 running in the transport direction of the material to be burned.
  • a horizontal section of a return duct 25, starting from the exhaust gas collecting duct 24, runs vertically downwards via a manifold approximately in the middle between the outer furnace wall 12a and the left inner furnace duct wall 10a.
  • Another slider 26 of the same design and function is arranged along the vertical section at approximately the same height as the slider 23.
  • the vertical section of the return duct 25 ends in the upper region of the furnace duct 10 directly at the high-speed burner 15 designed as an injector burner. According to FIG. 2, this is arranged horizontally in the left-hand furnace side wall 12, namely from the bottom 11 in the upper half of the furnace duct 10 .
  • another high-speed burner 15 is arranged in mirror symmetry and is connected in the same way to the exhaust gas collecting duct 24 via a return line 25 with an intermediate slide 26.
  • the burners 15 lying opposite one another in pairs are arranged at a distance from one another in the transport direction of the goods, so-called bulkheads 28 being arranged between the burners 15.
  • the bulkheads are sliders which run transversely to the transport direction of the goods and can be inserted vertically into the furnace duct 10 of the furnace from the furnace ceiling 14, the side edges of which end with, if necessary, a small distance in front of the furnace side walls 12, 13.
  • the bulkheads 28 have a rectangular shape and are height-adjustable, i.e. arranged more or less deep into the furnace channel 10.
  • the bulkhead 28 divides the reduction zone 17 into individual chambers in the area of the device according to the invention and thus in the area in front of the heating zone 19.
  • a chimney 29 adjoins the exhaust gas collecting duct 24, the cross section of which can be adjusted by a slide or valve device 30 arranged in the chimney path.
  • the gases are guided in the area of the reduction zone 17 against the transport direction of the material.
  • the one before Bulk gases 28 located against the direction of transport of the goods are sucked into the exhaust gas collecting channel 24 via the exhaust duct 22 arranged in front of them (again against the transport direction of the goods).
  • the suction effect results from the effect of the chimney 29 and / or the injector effect of the high-speed burners 15, the arrangement of which also has the effect that the gases sucked into the exhaust gas collecting duct 24 via the exhaust duct 22 then continue to lead to the burners 15 via the recirculation ducts 25, entrained there and returned to the furnace chamber while being burned at the same time.
  • the constant suction caused by the injector burner 15 leads to more and more combustion gases being withdrawn from the return duct 25 or from the upstream exhaust duct 22 and ultimately thus from the furnace duct 10 via the exhaust ducts 22 and in a 2 ur original flow direction (opposite to the transport direction of the goods) offset direction can be returned to the oven.
  • the arrangement of the burners 15 results in a return which is offset by 90 ° with respect to the original flow direction of the combustion gases, as a result of which a type of flow brake is built up.
  • slide plates that can be moved horizontally to the furnace channel can also be used, which can be divided and moved into different segments, if necessary.
  • the device according to the invention it is achieved that no more plumes of gas can get from the reduction zone 17 into the heating or cleaning zone 19, rather they can be sharply separated from one another, as is desired in order to achieve the best possible qualities.
  • further modification forms are possible without leaving the main idea of the invention.
  • the high-speed burners 15 designed as injector burners
  • other burners can also be used; Under certain circumstances, however, additional measures must then be taken, for example by fan arrangements, in order to ensure that the combustion gases are drawn in from the exhaust duct 22.
  • the burners 15 can also be arranged in different orientations to the original gas flow, for example also with flow components against the original flow direction.
  • the device according to the invention has the advantage that it can also be retrofitted in existing furnace systems.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Tunnel Furnaces (AREA)
  • Hydrogen, Water And Hydrids (AREA)
EP19860102870 1985-03-25 1986-03-05 Installation pour assurer la séparation de courants de gaz d'atmosphères différentes Expired - Lifetime EP0199032B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853510800 DE3510800C1 (de) 1985-03-25 1985-03-25 Einrichtung und Verfahren zur Sicherstellung der Trennung von Gasstroemen unterschiedlicher Atmosphaere
DE3510800 1985-03-25

Publications (3)

Publication Number Publication Date
EP0199032A2 true EP0199032A2 (fr) 1986-10-29
EP0199032A3 EP0199032A3 (en) 1987-11-11
EP0199032B1 EP0199032B1 (fr) 1990-06-27

Family

ID=6266286

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860102870 Expired - Lifetime EP0199032B1 (fr) 1985-03-25 1986-03-05 Installation pour assurer la séparation de courants de gaz d'atmosphères différentes

Country Status (6)

Country Link
EP (1) EP0199032B1 (fr)
JP (1) JPS61268979A (fr)
CZ (1) CZ279956B6 (fr)
DD (1) DD244623A5 (fr)
DE (1) DE3510800C1 (fr)
ES (1) ES8703614A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0221187A (ja) * 1988-07-09 1990-01-24 Noritake Co Ltd 燃焼式連続焼成トンネル炉
DE4434780C1 (de) * 1994-09-29 1995-10-19 Riedhammer Gmbh Co Kg Einrichtung zur Regelung des Gasdrucks in benachbarten Zonen eines Durchlaufofens

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB491076A (en) * 1937-02-22 1938-08-22 Gordon Dudley Phillips Tunnel kiln and method of operating same
DE811590C (de) * 1949-01-01 1951-08-23 Wistra Ofenbau Einrichtung zum Umwaelzen der Ofenatmosphaere von Glueh- und Waermoefen o. dgl.
DE1908643B1 (de) * 1969-02-21 1970-04-16 Keller Ofenbau Gmbh Verfahren zum Brennen von quarzhaltigen keramischen Produkten in einem Tunnelofen und Tunnelofen zur Durchfuehrung des Verfahrens
JPS5638871B2 (fr) * 1973-05-19 1981-09-09
JPS5344923A (en) * 1977-06-03 1978-04-22 Yoshiyuki Iwami Safety means for propane gas bomb cocks
JPS5538014A (en) * 1978-09-08 1980-03-17 Tdk Corp Wire bonding device
JPS5818085A (ja) * 1981-07-24 1983-02-02 大同特殊鋼株式会社 被熱材の予熱装置
JPS6012554B2 (ja) * 1982-12-20 1985-04-02 高砂工業株式会社 還元焼成におけるトンネル炉の制御方法
JPS59143018A (ja) * 1983-02-04 1984-08-16 Daido Youro Kk 鋼材の熱処理方法
DE3517866A1 (de) * 1985-05-17 1986-11-20 C. Keller GmbH u. Co KG, 4530 Ibbenbüren Verfahren zur direktbefeuerung eines tunnelofens sowie tunnelofen zur durchfuehrung des verfahrens

Also Published As

Publication number Publication date
DD244623A5 (de) 1987-04-08
DE3510800C1 (de) 1986-06-12
CZ279956B6 (cs) 1995-09-13
EP0199032A3 (en) 1987-11-11
EP0199032B1 (fr) 1990-06-27
ES553797A0 (es) 1987-02-16
ES8703614A1 (es) 1987-02-16
JPS61268979A (ja) 1986-11-28
CZ189186A3 (en) 1995-06-14

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