DK151596B - Tunnel oven for burning of ceramic goods - Google Patents

Tunnel oven for burning of ceramic goods Download PDF

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Publication number
DK151596B
DK151596B DK425677AA DK425677A DK151596B DK 151596 B DK151596 B DK 151596B DK 425677A A DK425677A A DK 425677AA DK 425677 A DK425677 A DK 425677A DK 151596 B DK151596 B DK 151596B
Authority
DK
Denmark
Prior art keywords
furnace
gas
tunnel
outlet
cooling
Prior art date
Application number
DK425677AA
Other languages
Danish (da)
Other versions
DK425677A (en
DK151596C (en
Inventor
Andreas Haessler
Jun Wilhelm Morgante
Original Assignee
Andreas Haessler
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
Priority to DE2643406 priority Critical
Priority to DE2643406A priority patent/DE2643406C3/de
Application filed by Andreas Haessler filed Critical Andreas Haessler
Publication of DK425677A publication Critical patent/DK425677A/en
Publication of DK151596B publication Critical patent/DK151596B/en
Application granted granted Critical
Publication of DK151596C publication Critical patent/DK151596C/en

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Classifications

    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B33/00Clay-wares
    • C04B33/32Burning methods
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27BFURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/30Details, accessories, or equipment peculiar to furnaces of these types
    • F27B9/3005Details, accessories, or equipment peculiar to furnaces of these types arrangements for circulating gases
    • Y02P40/65

Description

in 151596

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a direct-firing tunnel furnace for the burning of ceramic products, in particular those containing combustible or gasifiable substances, with a first outlet serving to direct furnace gas from the furnace into the ambient atmosphere, and a second furnace-gas outlet, from which the gas removed through this second exit can be reintroduced into the furnace after or in the high temperature range of the furnace, calculated in the direction of transport of the goods through the furnace.

In a known tunnel furnace of this kind ("Ziegelindustrie", booklet 11, 1972, page 521), part of the furnace gas is taken from the heating zone and 10 is again introduced into the tunnel furnace in the cooling zone. The final discharge of the flue gas takes place at the known furnace at the end of the furnace. The temperature of the furnace gas finally discharged into the atmosphere is searched by the well-known tunnel furnace - similar to the 15 performances prevailing so far in the art - kept as low as possible.

A major disadvantage of the known tunnel oven is that the flue gases from this furnace are always filled with carbonizing gases and combustible components when all the flue gas is discharged into the atmosphere at the end of the furnace. Since in the heating zone only a portion of the furnace gas is withdrawn, which in turn is introduced into the cooling zone, while all the furnace gas on the line between the main burning zone and the furnace outlet is supplied with gasifiable substances, the flue gas also contains a substantial part of combustible gaseous and combustible substances which can produce significant odor nuisances. 1 2 3 4 5 6

From Danish Patent Specification No. 107,668, a tunnel furnace of the kind specified in 2 is known, where at the insertion end of the goods 3 furnace gas is discharged into the ambient atmosphere. At this 4 known tunnel furnace there are also other flue gas exits through which 5 furnace gases are discharged, which are reintroduced into the tunnel furnace. However, the flow direction of the furnace gas is caused to change rhythmically so that it will make a pulsating movement in the direction with and opposite to the direction of movement of the goods to be burned.

Based on this prior art, the invention seeks to provide a tunnel furnace of the kind in question, in which the exhaust gases contain, to a lesser extent, than the known ones, which are more economically in use than the known furnaces.

5 It is therefore possible to achieve the low emission values demanded today with high operational technical certainty without excessive costs. Furthermore, the furnace must at least to a large extent be able to prevent the hitherto inevitable release of unburnt combustible gases into the atmosphere.

The tunnel furnace according to the invention is characterized in that the first furnace gas discharge calculated in the transport direction of the goods lies after the second furnace gas outlet and at a location in the furnace where the temperature of the furnace gas is higher than the gasification temperature of said substances in the ceramic products.

In the tunnel furnace according to the invention, the gasified flammable substances can be passed through the second furnace gas outlet in the direction of transport of the goods to a place in the furnace where the temperature is sufficiently high for combustion of these substances to be obtained. Since the first furnace gas through which the furnace gas is definitively carried away from the furnace, calculated in the transport of goods, is a short distance after said second departure, the furnace gas which is definitively removed from the furnace will have a relatively high temperature, which is in contrast to that by the known furnaces, the furnace gas is removed in a place where its temperature is lowest.

25 The removal of the furnace gas at low temperature means that economical heat recovery from the furnace gas is not possible. Heat recovery from low temperature gas requires expensive and expensive heat exchangers that are not profitable and which are further exposed to strong corrosion. 1

The furnace gas which is removed by the furnace according to the invention through the first outlet contains practically no more gasifiable or combustible substances. It therefore has a chemical composition that complies with the applicable environmental protection regulations. In addition, the discharged furnace gas has a temperature level which allows the recovery of the waste heat. In the discharge stream from the first furnace gas outlet, a heat exchanger can be connected in a very simple manner with which the waste heat contained in the furnace gas is partially recoverable.

In a preferred embodiment of the furnace according to the invention, the first outlet is located in the main combustion zone or fire zone or in the immediate vicinity thereof.

Advantageously, two or more first furnace gas exits can be found at locations in the furnace where the temperature of the furnace gas is higher than the ignition or gasification temperature of the said substances in the ceramic products, and a corresponding number of the other second gas exits can then be found, and thus also of gas inputs through which the gas from these other gas exits is reintroduced into the furnace.

According to the invention, it is further proposed that after a cooling zone in the furnace is arranged after a cooling zone separated from the ambient air by means of a shut-off means, in which the 20 burnt products are exposed to fresh air.

According to the invention, a fan with reversible flow direction may be arranged after the heat exchanger.

In a conduit connecting the second outlet to an inlet for the gas re-introduced into the furnace, a blower having a reversible flow direction may be provided by means of which the main gas flow in the tunnel duct's firing channel can be pulsated in a pilgrimage rate, and it then has It is found to be appropriate that the fans with reversible flow direction for the main gas stream and for the exhaust gas stream be coupled synchronously. The two gas streams are thus 30 aligned.

In the following, a preferred embodiment of the oven according to the invention will be described in greater detail with reference to the drawing, in which FIG. 1 is a schematic view of a tunnel furnace operated in accordance with a conventional method; FIG. 2 is a temperature diagram corresponding to the tunnel furnace according to the invention; and FIG. 3 is a view of FIG. 2 is a schematic representation of the tunnel oven according to the invention.

10 First, FIG. 1 is mentioned: In a tunnel furnace 1, dashed lines symbolize flue gas 6 in the direction indicated by an arrow 6a countercurrent to the transport carts 7, the direction of transport being symbolized by an arrow 7a. The flue gas exits the furnace in front of a shut-off valve 3 and is conducted by means of a ventilator 4 to a chimney 5. The known tunnel furnace shown has ceiling firing.

Next, FIG. 2 and 3, which are similar, are discussed:

Also at the tunnel furnace according to the invention, the fire trucks 7 travel in the direction indicated by arrow 7a from left to right through the tunnel furnace. The flue gas flows through the chimney. The supply air 20 can be controlled by the method according to the invention by means of a slider 19 arranged between a cooling zone E and an end cooling zone.

The movement of the fire trucks with the ceramic blanks takes place countercurrent to the main gas flow, which is symbolized by an arrow 10.

In principle, the tunnel furnace according to the invention can be divided into zones A to 25 F. Zone A is the inert heating zone with temperatures below 200 ° C. In zone A, no gasification processes are carried out. Then zone B comes with a temperature range of approx. 200 ° C to 700 ° C, in which the combustible substances are degassed from the ceramic blanks. In the following zone C, the products to be burned are degassed and further heated, for example from 700 ° C to 1200 ° C. The main fuel zone now follows D. Here, the tunnel furnace is supplied with the majority of the required fuel. In the subsequent cooling zone E, the burnt products are cooled to approx. 850 ° C, and in the subsequent end cooling zone the cooling takes place at the temperature at which the burnt products leave the tunnel oven.

5 While the flue gases at the known tunnel furnaces are discharged from zone A or partially from zone B, the flue gas furnace according to the invention sees no flue gas discharge at this location. In the tunnel furnace according to the invention, the flue gas intended to leave the tunnel furnace is instead discharged from the firing zone or main burning zone D or from the adjacent zones where the flue gas has a high temperature. For example, it can be partially extracted at high temperature from the cooling zone E.

The main gas stream 10 is passed through the burn channel of the tunnel furnace through zones B and A, where it is fed back and over again into the furnace in the cooling zone 15 or in the main burning zone through the overflow lines 11 in which there are fans 12. Furthermore, several parallel wiring lines can be found. The main gas flow can be sampled at several locations in the heating zone and again at several locations introduced into the cooling zone as well as partly in the heating zone.

The exhaust gas stream 13, which is smaller than the main gas stream 10, 20, is taken out of the tunnel furnace in the high temperature range at a flue gas temperature of approx. 600 ° C to 1200 ° C. The exhaust gas can also be extracted at several locations in the high temperature area and all the way to the cooling zone. The temperature at the sampling point (s) must be higher than the gasification temperature of the combustible substances in the furnaces of the heating zone B serving as a degassing zone so that no unburnt carbonization gas enters the exhaust chimney.

Thus, all carbonization gas and volatile harmful substances through the bypass lines 11 pass through the furnace's firing zone and burn there completely at the highest temperature. 1

The exhaust gas stream or the high temperature flue gas stream (approx.

600 ° C to 1000 ° C can be used for heating purposes. By means of the flue gas stream, for example, the heat exchanger 15 can be used for air heating or steam generation. The cooled flue gas is fed into the chimney 5 by a fan 16.

Claims (6)

    In FIG. 3 is a hot air flow which flows through the heat exchanger 15 and serves drying purposes, denoted by 17. The heating of the tunnel furnace is carried out through the lateral or top heating holes 18 in a known manner by means of usually used fuels during the supply of combustion air. Since, in the tunnel oven according to the invention, due to the cooling with the main gas stream 10, no complete cooling of the burnt goods takes place in the cooling zone E, another end cooling zone F, which is separated from the furnace space by means of the slider 19, is arranged at the end of the tunnel oven. is affected by a cooling air stream 20 for the final cooling of the burnt goods. The exhaust stream or the flue gas has a higher CO The necessary air supply in the total system is not limited to the burning zone, but can be done in all zones according to the requirements set.
  1. A direct-firing tunnel furnace for the burning of ceramic products, in particular those containing combustible or gasifiable substances, and having a first outlet (14) which serves to discharge furnace gas from furnace 25 into the ambient atmosphere, and a a second furnace gas outlet from which the gas removed by this second outlet can be reintroduced into the furnace after or in the furnace's high temperature range calculated in the goods direction of transport through the furnace, characterized in that the first furnace gas outlet (14) calculated in the goods transport direction lies after the second furnace gas outlet and on a location in the furnace where the temperature of the furnace gas is higher than the ignition or gasification temperature of said substances in the ceramic goods. 151596
  2. A tunnel oven according to claim 1, characterized in that a heat exchanger (15) for cooling the exhaust gas is arranged in the outlet stream (13) from the first outlet (14).
  3. Tunnel furnace according to any one of claims 1 or 2, characterized in that two or more first furnace gas outlets (14) are found in places in the furnace where the temperature of the furnace gas is higher than the ignition or gasification temperature of said substances. in the ceramic products, and that there is a corresponding number of the other gas outlets mentioned.
  4. Tunnel furnace according to any one of claims 1-3, characterized in that, after a cooling zone present in the furnace, a post-cooling zone (F) separated by a locking means (19) is arranged in the furnace, in which the burnt goods 15 are exposed to fresh air.
  5. A tunnel oven according to any one of claims 2-4, characterized in that a blower (16) with reversible flow direction is arranged after the heat exchanger (15).
  6. A tunnel furnace according to claim 5, wherein in a conduit (11) connecting the second outlet with an inlet for the gas re-introduced into the furnace, a blower (12) with reversible flow direction is arranged by means of a said main gas stream in the tunnel duct's burner duct can be pulsately moved in pilgrimage, k characterized in that the fans with reversible flow direction (12 and 16) for the main gas stream (10) and the outlet stream (13) are coupled synchronously.
DK425677A 1976-09-27 1977-09-26 Tunnel oven for burning of ceramic goods DK151596C (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE2643406 1976-09-27
DE2643406A DE2643406C3 (en) 1976-09-27 1976-09-27

Publications (3)

Publication Number Publication Date
DK425677A DK425677A (en) 1978-03-28
DK151596B true DK151596B (en) 1987-12-14
DK151596C DK151596C (en) 1988-05-24

Family

ID=5988948

Family Applications (1)

Application Number Title Priority Date Filing Date
DK425677A DK151596C (en) 1976-09-27 1977-09-26 Tunnel oven for burning of ceramic goods

Country Status (7)

Country Link
AT (1) AT384101B (en)
CH (1) CH628972A5 (en)
DE (1) DE2643406C3 (en)
DK (1) DK151596C (en)
FR (1) FR2365766B1 (en)
NL (1) NL7710546A (en)
NO (1) NO147533C (en)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1098416B (en) * 1978-09-04 1985-09-07 Salviati Impianti Spa A process for the production of bricks and plant for the implementation of said procedimemto
ATA312180A (en) * 1980-06-12 1986-03-15 Walter Ing Rieger Method for burning thin-walled ceramic moldings containing in particular core holes, and system for implementing the method
DE3042708C2 (en) * 1980-11-10 1986-07-17 Rudolf 2106 Bendestorf De Riedel
US4523907A (en) * 1981-03-11 1985-06-18 Haessler Andreas Holder and method of firing ceramic briquettes
AT376959B (en) * 1982-09-17 1985-01-25 Maerz Ofenbau Method for producing cement clinker
DE3324764C1 (en) * 1983-07-08 1985-02-14 Froehlich Air Ag Process for the operation of a throughflow kiln, especially a tunnel kiln, for the firing of ceramic mouldings and apparatus for the performance of this process
DE3516058C2 (en) * 1984-08-21 1986-07-17 Institut Fuer Ziegelforschung Essen E.V., 4300 Essen, De
DE3517866C2 (en) * 1985-05-17 1988-04-14 C. Keller Gmbh U. Co Kg, 4530 Ibbenbueren, De
DE3525771A1 (en) * 1985-07-19 1987-01-22 Haessler Andreas Tunnel furnace with waste gas flow which is low in harmful substances
AT383886B (en) * 1985-12-23 1987-09-10 Walter Ing Rieger Method for producing bricks from clay shapes and system for implementing the method
DE3605780C1 (en) * 1986-02-22 1987-06-19 Manfred Zimmermann Tunnel furnace for baking raw graphite electrodes
DE3627050C1 (en) * 1986-08-09 1991-11-28 Lingl Anlagenbau Tunnel kiln for the reducing firing of facing bricks
DE4023432C2 (en) * 1989-10-18 1995-05-24 Werner Ing Grad Strohmenger Tunnel kiln
AT401817B (en) * 1993-12-01 1996-12-27 Rieger Walter Method for burning ceramic moldings and system for implementing the method
DE4423221A1 (en) * 1994-07-01 1996-01-04 Lingl Anlagenbau Heat transfer in the tunnel oven
IT1309033B1 (en) * 1999-03-08 2002-01-15 Tecnochimica Sassolese S R L Continuous furnace perfected for the heat treatment of materials
DE102011100736A1 (en) 2011-05-06 2012-11-08 Andreas Hässler Method for operating e.g. tunnel furnace used for firing brick, involves directing exhaust gas stream from tunnel furnace to waste heat boiler for generating electric power utilized for drying and heating processes of furnace

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1226477B (en) * 1962-02-05 1966-10-06 Kollergeneratoren Und Ofenbau Method of heating a furnace, in particular tunnel kiln
DK107668C (en) * 1965-03-01 1967-06-19 Andreas Haessler A method for firing by operation of the through furnaces for ceramic products, as well as an oven for implementing the method.

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1413674A (en) * 1964-11-09 1965-10-08 Robert Aebi A G A method of operating a tunnel kiln and device for carrying out the method
FR1470155A (en) * 1966-02-28 1967-02-17 Cooking method and device for implementation of this method for conducting continuous circulation furnaces for ceramics
DE1303473C2 (en) * 1966-04-06 1974-01-17 A method of continuously burning of ceramic feedstock in tunnel kilns, and tunnel kiln for carrying out the method
FR2038592A5 (en) * 1969-03-19 1971-01-08 Koho Es Gepipari Miniszterium Tunnel kiln for the firing of refractory - ceramic products

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1226477B (en) * 1962-02-05 1966-10-06 Kollergeneratoren Und Ofenbau Method of heating a furnace, in particular tunnel kiln
DK107668C (en) * 1965-03-01 1967-06-19 Andreas Haessler A method for firing by operation of the through furnaces for ceramic products, as well as an oven for implementing the method.

Also Published As

Publication number Publication date
DK425677A (en) 1978-03-28
FR2365766A1 (en) 1978-04-21
NO147533B (en) 1983-01-17
DE2643406B2 (en) 1979-10-11
FR2365766B1 (en) 1982-12-17
DE2643406A1 (en) 1978-04-06
NL7710546A (en) 1978-03-29
DE2643406C3 (en) 1980-07-03
ATA690077A (en) 1987-02-15
NO773289L (en) 1978-03-29
NO147533C (en) 1983-04-27
DK151596C (en) 1988-05-24
AT384101B (en) 1987-10-12
CH628972A5 (en) 1982-03-31

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