EP0015903A1 - Verfahren zum befeuern eines tunnelofens mit kohle sowie kohlefeuerung für tunnelöfen. - Google Patents
Verfahren zum befeuern eines tunnelofens mit kohle sowie kohlefeuerung für tunnelöfen.Info
- Publication number
- EP0015903A1 EP0015903A1 EP79900029A EP79900029A EP0015903A1 EP 0015903 A1 EP0015903 A1 EP 0015903A1 EP 79900029 A EP79900029 A EP 79900029A EP 79900029 A EP79900029 A EP 79900029A EP 0015903 A1 EP0015903 A1 EP 0015903A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coal
- firing
- furnace
- tunnel kilns
- tunnel
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
-
- 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 peculiar to furnaces of these types
- F27B9/36—Arrangements of heating devices
Definitions
- the invention relates to a method for firing a tunnel kiln with coal and coal firing for the use of this method.
- the previous disadvantages of coal operation should be eliminated, so that if there is sufficient coal, the operation of a brickworks with coal and thus also a changeover from solid or gaseous fuels to coal, without any nuisance caused by coal dust and ash, without further is possible.
- this is achieved in that the coal is stored in a preferably airtight bunker and conveyed by means of airtight conveyor belts or chains connected thereto to coal injectors which are arranged in the combustion zone of the furnace and distributed over its width as burners, and in that the coal injectors an air supply line is connected, from which compressed air is supplied in pulses for blowing in the coal stored in metered quantities.
- the coal firing for tunnel kilns is characterized in that the burning points of a kiln are each formed by a coal injector, to which the coal is connected by means of airtight transport chains or, preferably, an airtight bunker. belts can be fed and which is connected to an air supply line, from which compressed air for introducing predetermined amounts of coal which can be stored in the coal injector into the combustion zone can be blown into the latter in pulses.
- coal injectors in a row distributed over the width of the combustion zone of the furnace and by means of a conveyor belt assigned to a row and an air distributor pipe with a conveyor belt running in the longitudinal direction of the furnace connected to the coal bunker or with a conveyor belt preferably parallel to it to connect this arranged main compressed air line.
- the coal injectors can each be formed in a simple manner from a vertical coal supply pipe connected to the conveyor belt and open at the bottom, a support plate arranged at a distance below this and a housing surrounding the end of the supply pipe and the plate, which housing and the compressed air supply line is connected via an injection or mixing tube or directly to the burning point, the housing of the coal injector being designed in the manner of a spiral in its axially perpendicular cross section.
- the support plate and / or the coal feed pipe of the coal injector In order to be able to easily dose the amount of coal to be blown in, it is appropriate to design the support plate and / or the coal feed pipe of the coal injector to be adjustable in height. For the same purpose, however, it is also possible to insert a push cylinder, a butterfly valve, a slide or the like into the coal feed pipe. to use.
- the inlet opening of the housing should be designed as a nozzle, the opening of which is directed towards the support plate.
- metering valves are expediently assigned to them, by means of which the pulse frequency and / or the blowing duration can be set, it being possible for a row or group of coal injectors to be assigned a common metering valve which is located in the air distributor pipe between the branch from the main compressed air line and the first coal injector is inserted into the latter.
- the cabbage according to the invention can be used particularly advantageously in a slot-fired tunnel kiln.
- the method according to the invention and the coal firing proposed make it possible to fire a tunnel furnace with coal without difficulty and without great construction expenditure, without the need to put up with the nuisance of coal dust and ash.
- the coal is conveyed from a bunker by means of airtight means of transport to coal injectors as burners, to which compressed air can be supplied in pulses from a compressed air line, it is possible with very simple means to transport the coal to the combustion points in a dust-free manner to be metered and mixed with air into the tunnel kiln so that good combustion is guaranteed and personnel and maintenance-free operation can be achieved.
- the coal which is delivered in closed containers and stored in a closed main bunker, is transferred dust-free to an intermediate bunker, which is placed near the furnace, but preferably outside the factory. From there, the coal is then transported along an airtight conveyor chain or another comparable means of conveyance along the Bren zone and by means of further chains arranged under the top chain at a distance from the rows of stoves to the individual burning points designed as coal injectors, which are always kept full. A certain amount of coal is formed in these by the height-adjustable plate or by a height adjustment of the feed pipe until the natural slope angle is reached automatically and the wake stops. When the metering valve is opened, the air is then between the tube and the plate blown so that the coal moves radially and at the same time carried tangentially mixed with air reaches the mixing and blowing tube and falls into the actual combustion channel.
- the fuel quantity is controlled by varying the number of pulses and / or the blowing length.
- Exact dosing in the individual groups is possible in a purely electronic manner with the greatest accuracy, moreover there is only a single moving part in the entire burner group, specifically in the dosing valve which does not come into contact with the coal but with Conveying air is fed so that no operational difficulties can arise as a result.
- the fire is distributed in such a way that it is predetermined by an appropriate mixture of air and more or less coarse coal. It is dependent on the furnace height, and on the other hand, the fire can be additionally influenced by the corresponding amount of air.
- the coal injectors thus work as actual burners, maintenance and operation-free, an automatic operation of a tunnel furnace equipped with such a coal firing is thus easily possible.
- the trimmings also remain dust-free and the finely divided ash can be easily extracted on the sole of the car, e.g. by means of inserted movable pipes which reach close to the surface of the wagon and by means of which the ashes arriving there can be continuously extracted in rhythm with the wagon movements. This reduces ash pollution to a minimum.
- the completely dust-tight conveyor system eliminates any nuisance to the operation or damage to the electrical systems.
- the coal burner according to the invention is therefore characterized by extreme simplicity and an operational safety and controllability which can hardly be surpassed.
- the path of the coal is hermetically sealed all around so that no dust can escape to the outside.
- the individual burners have no moving and therefore no wear and maintenance-dependent parts.
- the control is carried out in the usual way with absolute precision through the corresponding energy application, which is based solely on the temperature at the thermocouple. And only about 0.5 - 1 kW in total are required to drive the conveyor system.
- Fig. 1 is a coal furnace equipped with a tunnel furnace in partial view
- Fig. 2 can be used as a burner in the coal firing of Fig. 1
- the tunnel kiln shown in FIG. 1 in a partial section in perspective and designated 2 for firing ceramic products, such as of roof tiles, drainage pipes, grid stones and the like. is equipped with a coal firing 1.
- the individual combustion points 3, 3 '... provided in the combustion zone of the furnace 1 are formed from coal injectors 21, by means of which metered quantities of coal 4' can be blown into the combustion chamber in pulses.
- the coal 4 to be fired is brought from a main bunker (not shown) by means of a transport means 12 into an intermediate bunker 11 which is arranged at the level of the tunnel kiln 1. From the 3unker 11, the coal 4 is transported with the aid of a conveyor belt 13 along the
- Burning points are conveyed and reached by means of further conveyor belts 14 arranged transversely thereto, which are mounted below the conveyor belt 13, to the individual burning points 3, 3 '...
- the conveyor belts 13 and 14 run at low speed and convey the coal 4 in a very airtight manner from the bunker 11 in very small portions of approximately 1 to 4 kg / hour to the burning points 3, 3 '... of the tunnel oven 2. Since the conveyor belts 13 and 14 have the property of not clogging even when running continuously. Rather, a predetermined degree of filling of the downstream devices is ensured, a reliable and dust-free transport of the coal 4 to the coal injectors 21 is ensured.
- the housing 24 is here designed in a spiral shape and forms a mixing chamber 26 which encloses the plate 23 and opens into the combustion chamber via an injection or mixing pipe 25.
- the outlet opening is designed as a nozzle 27, by means of which compressed air is directed onto the plate 23.
- the housing 24 is connected to a transversely verlau ⁇ to the longitudinal direction of the tunnel furnace 2 fendes air supply pipe 16 by means of a hose line 17, - which in turn communicates with a parallel * arranged on the conveyor belt 13 the main air pipe 15 in communication, in the example produced by a fan of compressed air flows. Furthermore, a controllable metering valve 18 is installed in each case for the pulsed air supply into the coal injector 21 in the air distributor pipes 16 after they have branched off from the main air pipe 15.
- air pulses are distributed to the individual coal injectors 21 in such a way that the air suddenly blows away the coal lying on the plate 23.
- the duration of the air injection can be adjusted as desired by means of the valve 18 and the moment the air blast is stopped by the valve 18, the plate 23 fills up to the natural level
- the bed height of the coal can be varied on it, so that the amount of the coal is fed to the burners
- the coal can be delivered in the right grain size from the mines, on the other hand, you can use the air to add an additional one
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Tunnel Furnaces (AREA)
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2801193 | 1978-01-12 | ||
DE2801193A DE2801193C2 (de) | 1978-01-12 | 1978-01-12 | Verfahren zum Befeuern eines Tunnelofens mit Kohle sowie Kohlefeuerung fur Tunnelöfen |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0015903A1 true EP0015903A1 (de) | 1980-10-01 |
EP0015903B1 EP0015903B1 (de) | 1983-01-12 |
Family
ID=6029360
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP79900029A Expired EP0015903B1 (de) | 1978-01-12 | 1979-07-31 | Verfahren zum befeuern eines tunnelofens mit kohle sowie kohlefeuerung für tunnelöfen |
Country Status (5)
Country | Link |
---|---|
US (1) | US4283170A (de) |
EP (1) | EP0015903B1 (de) |
JP (1) | JPS55500025A (de) |
DE (1) | DE2801193C2 (de) |
WO (1) | WO1979000492A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IN158083B (de) * | 1981-07-01 | 1986-08-30 | Babcock Power Ltd | |
US4412814A (en) * | 1981-12-21 | 1983-11-01 | Dennis Jr Silas P | Apparatus and method for operating a brick kiln |
CN115031230B (zh) * | 2022-06-09 | 2023-03-24 | 安徽锐星节能科技有限公司 | 一种燃烧器的全方位窑尾喷煤器、使用方法及燃烧器 |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB144763A (en) * | 1919-03-11 | 1920-06-11 | James John Cantley Brand | Improvements in apparatus for firing furnaces with powdered fuel |
US1437342A (en) * | 1920-03-20 | 1922-11-28 | Benjamin G Griggs | Fine-fuel-feeding means for furnaces |
DE443466C (de) * | 1924-09-26 | 1927-04-29 | Barbara Gaertner Geb Braetsch | Staubzuteiler und Staubfoerderer fuer Brennstaubfeuerungen |
US2342039A (en) * | 1942-09-28 | 1944-02-15 | Link Belt Co | Bucket conveyer |
DE905473C (de) * | 1943-08-04 | 1954-03-01 | Keramische Ind Bedarfs K G Pau | Einrichtung zur Beheizung von Tunneloefen durch Kohlenstaub |
US2693775A (en) * | 1950-02-11 | 1954-11-09 | Allen Sherman Hoff Co | Ash handling apparatus |
FR1489369A (fr) * | 1966-08-10 | 1967-07-21 | Steinmueller Gmbh L & C | Procédé et appareil permettant d'alimenter, uniformément, les broyeurs d'un foyerà poussier de charbon |
DE1757836B2 (de) * | 1968-06-19 | 1973-11-22 | Siemens Ag, 1000 Berlin U. 8000 Muenchen | Bekohlungsanlage für Kraftwerke |
DE2108380A1 (de) * | 1971-02-22 | 1972-09-07 | Lucks + Co GmbH Industriebau, 3300 Braunschweig | Beschickungsvorrichtung fur Behal ter großen Querschnitts |
US4092094A (en) * | 1977-02-25 | 1978-05-30 | Lingl Corporation | Method and apparatus for the controlled distribution of powdered solid fuel to burning units |
-
1978
- 1978-01-12 DE DE2801193A patent/DE2801193C2/de not_active Expired
- 1978-12-22 JP JP50020078A patent/JPS55500025A/ja active Pending
- 1978-12-22 WO PCT/DE1978/000042 patent/WO1979000492A1/de unknown
-
1979
- 1979-07-31 EP EP79900029A patent/EP0015903B1/de not_active Expired
- 1979-09-10 US US06/073,638 patent/US4283170A/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO7900492A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE2801193C2 (de) | 1980-02-28 |
US4283170A (en) | 1981-08-11 |
WO1979000492A1 (en) | 1979-07-26 |
JPS55500025A (de) | 1980-01-24 |
EP0015903B1 (de) | 1983-01-12 |
DE2801193B1 (de) | 1979-06-28 |
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