WO1982002762A1 - Method and furnace for the combustion of materials such as limestone,dolomite,magnesite or the like,and utilisation of this furnace - Google Patents

Method and furnace for the combustion of materials such as limestone,dolomite,magnesite or the like,and utilisation of this furnace Download PDF

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Publication number
WO1982002762A1
WO1982002762A1 PCT/DE1982/000021 DE8200021W WO8202762A1 WO 1982002762 A1 WO1982002762 A1 WO 1982002762A1 DE 8200021 W DE8200021 W DE 8200021W WO 8202762 A1 WO8202762 A1 WO 8202762A1
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WIPO (PCT)
Prior art keywords
zone
furnace
combustion
cooling
gas
Prior art date
Application number
PCT/DE1982/000021
Other languages
German (de)
French (fr)
Inventor
& Erden Gmbh Waermestelle Steine
Erich Bertsch
Original Assignee
Steine & Erden Gmbh Waermestel
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Filing date
Publication date
Priority claimed from CH733/81A external-priority patent/CH651650A5/en
Application filed by Steine & Erden Gmbh Waermestel filed Critical Steine & Erden Gmbh Waermestel
Publication of WO1982002762A1 publication Critical patent/WO1982002762A1/en

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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
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces
    • F27B1/005—Shaft or like vertical or substantially vertical furnaces wherein no smelting of the charge occurs, e.g. calcining or sintering furnaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G5/00—Profiting from waste heat of combustion engines, not otherwise provided for
    • F02G5/02—Profiting from waste heat of exhaust gases
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the invention relates to a method for firing lumpy firing material, such as limestone, dolomite, magnesite or the like.
  • a shaft insert which extends from the lower part of the cooling zone to the upper part of the combustion zone, is arranged coaxially to the shaft wall and at a distance from it.
  • the shaft insert has openings through which the part of the at least partially used fuel gases, which is taken down by the burned material, and cooling air rising from the cooling zone enter the shaft insert. The gas mixture is sucked out of the shaft insert by means of injectors and the
  • the injector has been operated with propellant air, which was preheated in a recuperator, to which part of the furnace exhaust gases rising in the preheating zone was supplied as heat medium.
  • the heating of the propellant air was inevitable, especially when burning high-percentage limestone, which requires a maximum of heat when burning and in which a maximum of carbon dioxide escapes.
  • the heating of the propellant air in the recuperator by means of the furnace exhaust gases has the disadvantage that the soot of the furnace exhaust gases and the dust carried by the furnace exhaust gases, depending on the nature of the combustion material, are deposited in the recuperator, so that the propellant air is gradually heated less and the recuperator finally clogged after some time. Because the cleaning of the recuperator is tedious and time-consuming, the furnace operation had to be interrupted for a long time, the furnace cooling, so that the temperature in the combustion and preheating zone when the furnace operation started again did not ensure proper firing of the good was sufficient.
  • the invention is further based on the surprising finding that the driving air of the injector considerably reduces the thermal efficiency of the furnace.
  • the thermal The efficiency of the furnace depends primarily on how large the amount of heat that is carried away by the exhaust gases from the furnace. Since the exhaust gases leave the combustion zone at high temperatures, they carry considerable amounts of heat with them. A part of this amount of heat is used for heating the material located in the preheating zone. For the efficiency it is now important that as large a part as possible of the amount of heat carried along by the furnace exhaust gases is absorbed by the material located in the preheating zone. This proportion is greater the slower the exhaust gas flows through the preheating zone, ie the smaller the quantities of gas which transport the heat from the combustion zone to the preheating zone per unit of time.
  • the invention is therefore based on the object of reducing the proportion of air in the gases in the furnace and of permitting uninterrupted operation of the furnace. - 4 -
  • a recuperator is provided in a manner known per se, to which at least part of the furnace exhaust gases rising through the preheating zone is supplied as the heating medium.
  • the recuperator is used according to the invention for heating fresh air which, for. B. dries the material in a drying system used together with the shaft furnace, in particular a mill drying system.
  • the gas engine is used to drive a generator for generating electricity, which, for. B. can also be used for the operation of the mill drying system. Because the injector or injectors are operated with the exhaust gas of the gas engine, its waste heat is used for heating the combustion and preheating zone.
  • the single figure shows a schematic representation of a shaft furnace.
  • the cylindrical shaft furnace 1 shown has a preheating zone V, a combustion zone B and a cooling zone K.
  • the lumpy material to be burned e.g. B. lime
  • the preheating zone V is fed through a funnel-shaped feed 2.
  • a tube 3 is arranged coaxially to the furnace wall, into which a part of the furnace exhaust gases rising in this zone flows at the lower, open end and the upper part of which is closed at the end is connected to a recuperator 5 by a line 4.
  • the furnace exhaust gases emerging through the outlet nozzle 6 of the recuperator 5 are passed, together with the remaining furnace exhaust gases flowing through an outlet nozzle 7 at the upper end of the preheating zone V, to the chimney via dedusting filters in a manner not shown.
  • the waste heat from the exhaust gases supplied to the recuperator 5 is used to heat fresh air, which is fed to a mill-drying system (not shown).
  • An injector opens into each of the feeds 8, only one of these injectors being shown in the drawing and being designated by 10.
  • the propellant inlets 12 of the injectors 10 are connected to a ring line 13 which is connected to the exhaust line 14 of a gas engine 15.
  • the z. B. gas engine 15 powered by natural gas drives a generator 16 on, which generates electrical current, which, for. B.
  • the suction ports 17 of the injectors 10 are connected to the upper part of a cylindrical shaft insert 18 which is arranged coaxially to the furnace wall and is distanced therefrom.
  • the shaft insert 18 extends from the upper part of the firing zone B to the lower part of the cooling zone K and limits the two zones to the annular space delimited by him and the shaft wall. It is open at the bottom and in the middle area, below the feeds 8, is provided with openings 19 through which the part of the at least partially consumed fuel gases, designated 20, which together with the fired material in the combustion zone B down towards the Cooling zone K flows, and cooling air 22, which rises therein and blows through a cooling air supply line 21 into the lower part of cooling zone K, enters the shaft insert 18.
  • the gas mixture is sucked out of the shaft insert 18 by means of the injectors 10 and fed into the combustion zone B with the gas engine exhaust gases through the feeds 8 which supply the fuel gas 9.
  • a funnel-shaped discharge device 23 for the fired material is arranged at the lower end of the cooling zone K.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Furnace Details (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)

Abstract

The material introduced by the top of the furnace (1) passes successively through a preheating area (V), a combustion area (B) and a cooling area (K). The area (B) is supplied with combustion gaz (9) and the area (K) is supplied with cooling air (21). A portion (20) of the combustion gaz at least partially burnt and flowing from the area (B) with the roasted materials reaches, together with ascending cooling air (22), a cylinder (18). Nozzles (10) suck the gaz mixture outside the cylinder (18) and exhaust said mixture into the area (B); they are actuated by the exhaust gaz of an engine (15).

Description

Verfahren und Schachtofen zum Brennen von stückigem Brenngut, wie Kalkstein, Dolomit, Magnesit oder dgl. sowie Verwendung des Schachtofens Process and shaft furnace for burning lumpy items, such as limestone, dolomite, magnesite or the like, and use of the shaft furnace
Die Erfindung betrifft ein Verfahren zum Brennen von stückigem Brenngut, wie Kalkstein, Dolomit, Magnesit oder dgl. gemäß dem Oberbegriff des Patentanspruchs 1 , einen Schachtofen zur Durchführung des Verfahrens ge¬ mäß dem Oberbegriff des Patentanspruchs 2 sowie eine Verwendung des Schachtofens gemäß dem Oberbegriff des Patentanspruchs 3.The invention relates to a method for firing lumpy firing material, such as limestone, dolomite, magnesite or the like. According to the preamble of claim 1, a shaft furnace for carrying out the method according to the preamble of claim 2 and a use of the shaft furnace according to the preamble of Claim 3.
Verfahren un Schachtöfen dieser Art sind aμs der DE-PS 1 281 111 und der DE-AS 1 214 590 bekannt. Dabei ist koaxial zur Schachtwandung und von dieser distanziert ein Schachteinsatz angeordnet, der sich vom unteren Teil der Kühlzone bis zum oberen Teil der Brennzone er¬ streckt. Der Schachteinsatz weist Öffnungen auf, durch welche der Teil der wenigstens teilweise verbrauchten Brenngase, der vom gebrannten Gut nach unten mitgenom¬ men wird, sowie aus der Kühlzone aufsteigende Kühlluft in den Schachteinsatz gelangen. Mittels Injektoren wird das Gasgemisch aus dem Schachteinsatz abgesaugt und derMethods and shaft furnaces of this type are known from German Patent 1,281,111 and German Patent 1,214,590. A shaft insert, which extends from the lower part of the cooling zone to the upper part of the combustion zone, is arranged coaxially to the shaft wall and at a distance from it. The shaft insert has openings through which the part of the at least partially used fuel gases, which is taken down by the burned material, and cooling air rising from the cooling zone enter the shaft insert. The gas mixture is sucked out of the shaft insert by means of injectors and the
- J E T in die Brennzone mündenden BrenngasZuführung zugeführt. Durch.diese Umwälzung der wenigstens teilweise verbrauch¬ ten Brenngase und der Kühlluft wird ein einwandfreies Brennen des Guts in der Brennzone erreicht.- JET fed into the combustion zone supplying fuel gas. This circulation of the at least partially consumed fuel gases and the cooling air ensures that the material burns properly in the combustion zone.
Bisher hat man den Injektor mit Treibluft betrieben, die in einem Rekuperator vorgewärmt wurde, dem als Wärme¬ mittel ein Teil der in der Vorwärmzone aufsteigenden Ofenabgase zugeführt wurde. Die Erwärmung der Treibluft war vor allem beim Brennen von hochprozentigem Kalkstein unumgänglich, der beim Brennen ein Höchstmaß an Wärme erfordert und bei dem ein Höchstmaß an Kohlensäure ent¬ weicht.So far, the injector has been operated with propellant air, which was preheated in a recuperator, to which part of the furnace exhaust gases rising in the preheating zone was supplied as heat medium. The heating of the propellant air was inevitable, especially when burning high-percentage limestone, which requires a maximum of heat when burning and in which a maximum of carbon dioxide escapes.
Die Erwärmung der Treibluft im Rekuperator mittels der Ofenabgase hat den Nachteil, daß der Ruß der Ofenab¬ gase und der je nach Beschaffenheit des Brenngutes von den Ofenabgasen mitgeführte Staub sich im Rekuperator niederschlägt, so daß die Treibluft allmählich immer weniger erwärmt wird und der Rekuperator schließlich nach einiger Zeit verstopft. Weil die Reinigung des Re¬ kuperators mühsam und zeitaufwendig ist, mußte der Ofen¬ betrieb jeweils für längere Zeit unterbrochen werden, wobei der Ofen abkühlte, so daß die Temperatur in der Brenn- und Vorwärmzone beim Wiederbeginn des Ofenbe¬ triebs nicht für ein einwandfreies Brennen des Gutes ausreichte.The heating of the propellant air in the recuperator by means of the furnace exhaust gases has the disadvantage that the soot of the furnace exhaust gases and the dust carried by the furnace exhaust gases, depending on the nature of the combustion material, are deposited in the recuperator, so that the propellant air is gradually heated less and the recuperator finally clogged after some time. Because the cleaning of the recuperator is tedious and time-consuming, the furnace operation had to be interrupted for a long time, the furnace cooling, so that the temperature in the combustion and preheating zone when the furnace operation started again did not ensure proper firing of the good was sufficient.
Die Erfindung geht weiter von der überraschenden Erkennt¬ nis aus, daß die Treibluft des Injektors den thermischen Wirkungsgrad des Ofens erheblich herabsetzt. Der thermi- sehe Wirkungsgrad des Ofens hängt vor allem davon ab, wie groß die von den Abgasen aus dem Ofen weggeführte Wärmemenge ist. Da die Abgase die Brennzone mit hoher Temperatur verlassen, führen sie erhebliche Wärmemengen mit sich. Ein Teil dieser Wärmemenge wird für die Er¬ wärmung des in der Vorwärmzone befindlichen Guts ge¬ nutzt. Für den Wirkungsgrad kommt es nun darauf an, daß ein möglichst großer Teil der von den Ofenabgasen mit¬ geführten Wärmemenge vom in der Vorwärmzone befindlichen Material aufgenommen wird. Dieser Anteil ist umso grös- ser, je langsamer das Abgas durch die Vorwärmzone strömt, d. h. je kleiner die Gasmengen sind, welche pro Zeitein¬ heit die Wärme von der Brenn- in die Vorwärmzone trans¬ portieren. Vor allem bei stark endothermen Prozessen (Entsäuerung von Karbonaten, Brennen von Schamotte usw.) und wenn das zu brennende Gut außerdem noch wärmeempfind¬ lich ist und nur mit Abgasen von niedrigen Temperaturen vorgewärmt werden darf, mußte aber bisher sehr viel' Treibluft zugeführt werden. Durch die für den Betrieb des Injektors bisher verwendete Treibluft wurde näm¬ lich der Luftanteil des in der Brennzone umgewälzten Gas¬ gemischs stark erhöht, wodurch sich dessen Enthalpie verringerte. Die in der Brennzone vor allem für stark endotherme Prozesse erforderiche, große Wärmemenge konnte bei gleichzeitig niedriger ..Temperatur der Gase deshalb nur mit großen Gasmengen und damit erheblicher Treibluftzufuhr erreicht werden. Es entstanden so sehr große AbgasStrömungen, die große Wärmemengen aus dem Ofen wegführten und damit den thermischen Wirkungsgrad erheblich herabsetzten.The invention is further based on the surprising finding that the driving air of the injector considerably reduces the thermal efficiency of the furnace. The thermal The efficiency of the furnace depends primarily on how large the amount of heat that is carried away by the exhaust gases from the furnace. Since the exhaust gases leave the combustion zone at high temperatures, they carry considerable amounts of heat with them. A part of this amount of heat is used for heating the material located in the preheating zone. For the efficiency it is now important that as large a part as possible of the amount of heat carried along by the furnace exhaust gases is absorbed by the material located in the preheating zone. This proportion is greater the slower the exhaust gas flows through the preheating zone, ie the smaller the quantities of gas which transport the heat from the combustion zone to the preheating zone per unit of time. Especially in highly endothermic processes (de-acidification of carbonates, burning of fire, etc.) and when the object to be burned Good also still wärmeempfind¬ is Lich and must be pre-heated with exhaust gases of low temperatures, but a lot of 'blowing air had to be fed before. Because of the propellant air previously used for the operation of the injector, the proportion of air in the gas mixture circulated in the combustion zone was greatly increased, which reduced its enthalpy. The large amount of heat required in the firing zone, especially for strongly endothermic processes, could be reduced at the same time . .Temperature of the gases can therefore only be achieved with large amounts of gas and thus a significant supply of propellant air. This resulted in very large exhaust gas flows, which led large amounts of heat out of the furnace and thus significantly reduced the thermal efficiency.
Der Erfindung liegt deshalb die Aufgabe zugrunde, den Luftanteil der Gase im Ofen zu verringern und einen un¬ unterbrochenen Betrieb des Ofens zu ermöglichen. - 4 -The invention is therefore based on the object of reducing the proportion of air in the gases in the furnace and of permitting uninterrupted operation of the furnace. - 4 -
Diese Aufgabe wird gemäß der Erfindung in verfahrens¬ mäßiger Hinsicht durch die im Kennzeichen des Anspruchs 1 angegebenen Merkmale und in vorrichtungsmäßiger Hin¬ sicht durch die im Kennzeichen des Anspruchs 2 aufge¬ führten Merkmale gelöst. Die erfindungsgemäße Verwen¬ dung des Schachtofens ist Gegenstand des Anspruchs 3.This object is achieved according to the invention in procedural terms by the features specified in the characterizing part of claim 1 and in terms of the device by the features listed in the characterizing part of claim 2. The use of the shaft furnace according to the invention is the subject of claim 3.
Durch das erfindungsgemäße Ersetzen der Treibluft des Injektors durch das Abgas eines Gasmotors wird der Luft¬ anteil der Gase im Ofen herabgesetzt, wodurch deren Enthalpie und damit der thermische Wirkungsgrad des Ofens erhöht wird. Zudem werden Unterbrechungen des Ofenbe¬ triebs, die wegen der periodischen Reinigung des Rekupe¬ rators bisher erforderlich waren, vermieden.By replacing the driving air of the injector with the exhaust gas of a gas engine, the air portion of the gases in the furnace is reduced, which increases their enthalpy and thus the thermal efficiency of the furnace. In addition, interruptions in the operation of the furnace which were previously necessary due to the periodic cleaning of the recuperator are avoided.
Bei der erfindungsgemäßen Verwendung des Schachtofens ist in an sich bekannter Weise ein Rekuperator vorge¬ sehen, dem als Wärmemittel wenigstens ein Teil der durch die Vorwärmzone nach oben steigenden Ofenabgase zuge¬ führt wird. Der Rekuperator wird erfindungsgemäß zur Er¬ wärmung von Frischluft verwendet, die z. B. das Gut in einer zusammen mit dem Schachtofen verwendeten Trock¬ nungsanlage, insbesondere einer Mahltrocknungsanlage, trocknet. Der Gasmotor wird zum Antrieb eines Generators für die Erzeugung von Strom verwendet, der z. B. eben¬ falls für den Betrieb der Mahltrocknungsanlage eingesetzt werden kann. Weil der bzw. die Injektoren mit dem Ab¬ gas des Gasmotors betrieben werden, wird dessen Abwärme für die Erhitzung der Brenn- und Vorwärmzone genutzt.When the shaft furnace is used according to the invention, a recuperator is provided in a manner known per se, to which at least part of the furnace exhaust gases rising through the preheating zone is supplied as the heating medium. The recuperator is used according to the invention for heating fresh air which, for. B. dries the material in a drying system used together with the shaft furnace, in particular a mill drying system. The gas engine is used to drive a generator for generating electricity, which, for. B. can also be used for the operation of the mill drying system. Because the injector or injectors are operated with the exhaust gas of the gas engine, its waste heat is used for heating the combustion and preheating zone.
Im folgenden wird anhand der Zeichnung ein Ausführungs¬ beispiel der Erfindung näher beschrieben. - 5 -An exemplary embodiment of the invention is described in more detail below with reference to the drawing. - 5 -
Die einzige Figur zeigt eine schematische Darstellung eines Schachtofens.The single figure shows a schematic representation of a shaft furnace.
Der dargestellte, zylindrische Schachtofen 1 hat eine Vorwärmzone V, eine Brennzone B und eine Kühlzone K. Das zu verbrennende, stückige Gut, z. B. Kalk, wird der Vor¬ wärmzone V durch eine trichterförmige Zuführung 2 zuge¬ führt. In der Vorwärmzone V ist ein Rohr 3 koaxial zur Ofenwandung angeordnet, in das am unteren, offenen Ende ein Teil der in dieser Zone aufsteigenden Ofenabgase strömt und dessen oberer, am Ende abgeschlossener Teil durch eine Leitung 4 mit einem Rekuperator 5 verbunden ist. Die durch den Auslaßstutzen 6 des Rekuperators 5 austretenden Ofenabgase werden zusammen mit den rest¬ lichen, durch einen Auslaßstutzen 7 am oberen Ende der Vorwärmzone V ausströmenden Ofenabgasen in nicht dargestellter Weise über Entstaubungsfilter zum Kamin geleitet. Die Abwärme der dem Rekuperator 5 zugeführten Abgase wird zur Erwärmung von Frischluft genutzt, die einer (nicht dargestellten) Mahltrocknungsanlage zuge¬ führt wird. Durch mehrere, in der Höhe gegeneinander versetzte Zuführungen 8 wird der Brennzone B Brenngas zugeführt, das mittels nicht dargestellter Brenner durch Verbrennung von Leuchtgas, Erdgas, Oel oder festen Brenn¬ stoffen erzeugt wird und dessen Zufuhr durch Pfeile 9 angedeutet ist. In jede der Zuführungen 8 mündet ein Injektor, wobei in der Zeichnung nur einer dieser In¬ jektoren dargestellt und mit 10 bezeichnet ist. Die Treib itteleinlässe 12 der Injektoren 1O sind an eine Ringleitung 13 angeschlossen, die mit der Auspufflei- tung 14 eines Gasmotors 15 verbunden ist. Der z. B. mit Erdgas betriebene Gasmotor 15 treibt einen Generator 16 an, der elektrischen Strom erzeugt, welcher z . B . für die Mahltrocknungsanlage verwendet werden kann . Die An¬ saugstutzen 17 der Injektoren 10 sind mit dem oberen Teil eines koaxial zur Ofenwandung angeordneten und von dieser distanzierten , zylindrischen Schachteinsatzes 18 verbunden. Der Schachteinsatz 18 erstreckt sich vom obe¬ ren Teil der Brenn zone B bis in den unteren Teil der Kühlzone K und beschränkt die beiden Zonen auf den von ihm und der Schachtwandung begrenzten Ringraum. Er ist unten offen und im mittleren Bereich, unterhalb der Zu¬ führungen 8 mit Öffnungen 19 versehen, durch welche der mit 20 bezeichnete Teil der wenigstens teilweise verbrauchten Brenngase , der zusammen mit dem gebrannten Gut in der -Brennzone B nach unten in Richtung auf die Kühlzone K strömt, sowie durch eine Kühlluftzufuhrlei- tung 21 in den unteren Teil der Kühlzone K geblasene, darin aufsteigende Kühlluft 22 in den Schachteinsatz 18 eintreten. Mittels der Injektoren 10 wird das Gas¬ gemisch aus dem Schachteinsatz 18 abgesaugt und mit den Gasmotorabgasen durch die das Brenngas 9 zuführenden Zu¬ führungen 8 in die Brennzone B eingespeist. Am unteren Ende der Kühlzone K ist eine trichterförmige Austrage¬ vorrichtung 23 für das gebrannte Gut angeordnet . The cylindrical shaft furnace 1 shown has a preheating zone V, a combustion zone B and a cooling zone K. The lumpy material to be burned, e.g. B. lime, the preheating zone V is fed through a funnel-shaped feed 2. In the preheating zone V, a tube 3 is arranged coaxially to the furnace wall, into which a part of the furnace exhaust gases rising in this zone flows at the lower, open end and the upper part of which is closed at the end is connected to a recuperator 5 by a line 4. The furnace exhaust gases emerging through the outlet nozzle 6 of the recuperator 5 are passed, together with the remaining furnace exhaust gases flowing through an outlet nozzle 7 at the upper end of the preheating zone V, to the chimney via dedusting filters in a manner not shown. The waste heat from the exhaust gases supplied to the recuperator 5 is used to heat fresh air, which is fed to a mill-drying system (not shown). A plurality of feeds 8 offset in height from one another feed fuel gas B to the combustion zone B, which is produced by means of a burner (not shown) by burning luminous gas, natural gas, oil or solid fuels and the feed of which is indicated by arrows 9. An injector opens into each of the feeds 8, only one of these injectors being shown in the drawing and being designated by 10. The propellant inlets 12 of the injectors 10 are connected to a ring line 13 which is connected to the exhaust line 14 of a gas engine 15. The z. B. gas engine 15 powered by natural gas drives a generator 16 on, which generates electrical current, which, for. B. can be used for the mill drying system. The suction ports 17 of the injectors 10 are connected to the upper part of a cylindrical shaft insert 18 which is arranged coaxially to the furnace wall and is distanced therefrom. The shaft insert 18 extends from the upper part of the firing zone B to the lower part of the cooling zone K and limits the two zones to the annular space delimited by him and the shaft wall. It is open at the bottom and in the middle area, below the feeds 8, is provided with openings 19 through which the part of the at least partially consumed fuel gases, designated 20, which together with the fired material in the combustion zone B down towards the Cooling zone K flows, and cooling air 22, which rises therein and blows through a cooling air supply line 21 into the lower part of cooling zone K, enters the shaft insert 18. The gas mixture is sucked out of the shaft insert 18 by means of the injectors 10 and fed into the combustion zone B with the gas engine exhaust gases through the feeds 8 which supply the fuel gas 9. A funnel-shaped discharge device 23 for the fired material is arranged at the lower end of the cooling zone K.

Claims

- 7 -Patentansprüche - 7 patent claims
1. Verfahren zum Brennenvon stückigem Brenngut, wie Kalkstein, Dolomit, Magnesit oder dgl., bei dem das oben in einen Schachtofen eingegebene Gut nacheinander durch eine Vorwärm-, eine Brenn- und eine Kühlzone sinkt, der Kühlzone Kühlluft und der Brennzone Brenngas zugeführt wird, und wenigstens der mit dem gebrannten Gut nach unten sinkende Teil der wenigstens teilweise verbrauch¬ ten Brenngase sowie aufsteigende Kühlluft durch wenig¬ stens einen Injektor angesaugt und der Brennzone zuge¬ führt werden, dadurch gekennzeichnet, daß der Injek¬ tor (10) mit dem Abgas eines Gasmotors (15) betrieben wird.1. A method for firing lumpy fired goods, such as limestone, dolomite, magnesite or the like, in which the goods fed into a shaft furnace at the top sink in succession through a preheating zone, a firing zone and a cooling zone, the cooling air cooling zone and the fuel gas combustion zone are supplied , and at least the part of the at least partially consumed fuel gases sinking with the fired material and rising cooling air are sucked in by at least one injector and fed to the combustion zone, characterized in that the injector (10) with the Exhaust gas from a gas engine (15) is operated.
2. Schachtofen zur Durchführung des Verfahrens nach Anspruch 1, mit einer Vorwärm-, einer Brenn- und einer Kühlzone, wenigstens einer in die Brennzone mündenden Brenngaszuführung, einer in die Kühlzone mündenden Kühlluftzuführung und einem wenigstens teilweise von der Schachtofenwandung distanzierten Schachteinsatz, der Öffnungen für den Eintritt von wenigstens teil¬ weise verbrauchten Brenngasen und aμfsteigender Kühl¬ luft aufweist und mit dem Ansaugstutzen wenigstens eines in die BrenngasZuführung oder die Brennzone mündenden Injektors verbunden ist, dadurch gekennzeichnet, daß der Treibmitteleinlaß (12) des Injektors (10) an die Auspuffleitung (14) eines Gasmotors (15) angeschlossen ist. - 8 -2. shaft furnace for performing the method according to claim 1, with a preheating, a combustion and a cooling zone, at least one fuel gas supply opening into the combustion zone, a cooling air supply opening into the cooling zone and a shaft insert at least partially distanced from the shaft furnace wall, the openings for has the entry of at least partially used fuel gases and increasing cooling air and is connected to the intake port of at least one injector opening into the fuel gas supply or the combustion zone, characterized in that the propellant inlet (12) of the injector (10) is connected to the exhaust line ( 14) a gas engine (15) is connected. - 8th -
3. Verwendung des Schachtofens nach Anspruch 2, wobei wenigstens ein Teil der durch die Vorwärmzone auf¬ steigenden Abgase durch einen Rekuperator geleitet wird, dadurch gekennzeichnet, daß im Rekuperator Frischgas für eine Trocknungsanläge aufgeheizt und mit dem Gasmotor (15) ein Generator (16) für die Erzeugung von elektrischem Strom angetrieben wird. 3. Use of the shaft furnace according to claim 2, wherein at least part of the exhaust gases rising through the preheating zone is passed through a recuperator, characterized in that fresh gas is heated in the recuperator for a drying system and with the gas engine (15) a generator (16) is driven for the generation of electric current.
PCT/DE1982/000021 1981-02-04 1982-02-03 Method and furnace for the combustion of materials such as limestone,dolomite,magnesite or the like,and utilisation of this furnace WO1982002762A1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CH733/81 1981-02-04
CH733/81A CH651650A5 (en) 1981-02-04 1981-02-04 METHOD AND TUBE FOR THE BURNING OF PIECE OF COMBUSTION.
DE3119198810514 1981-05-14
DE3119198A DE3119198C2 (en) 1981-02-04 1981-05-14 Method and shaft furnace for burning lumpy items such as limestone, dolomite, magnesite or the like. As well as use of the shaft furnace

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0281535A1 (en) * 1987-02-25 1988-09-07 PPS Project Promotion Services AB A heat and power co-generation plant
WO2008022941A1 (en) * 2006-08-22 2008-02-28 Rheinkalk Gmbh Annular shaft kiln

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE716158C (en) * 1939-01-20 1942-01-14 Argus Motoren Ges M B H Device for utilizing the energy of the exhaust gases of an internal combustion engine
DE1152653B (en) * 1958-11-25 1963-08-08 Rheinische Kalksteinwerke Shaft furnaces for burning limestone or other carbonates with exhaust gas circulation
DE1214590B (en) * 1960-09-22 1966-04-14 Beckenbach Karl Gas or oil-heated shaft furnace for burning limestone, dolomite or the like.
DE1281111B (en) * 1961-06-21 1968-10-24 Beckenbach Karl Process for burning limestone or the like in a shaft furnace and shaft furnace operating according to this method
DE1558072A1 (en) * 1967-03-04 1970-03-19 Rheinische Kalksteinwerke Procedure for operating a shaft furnace
FR2316569A1 (en) * 1975-06-18 1977-01-28 Foster Wheeler Energy Corp DEVICE FOR RECOVERING THE HEAT FROM THE EXHAUST GASES OF A HEAT GENERATOR

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE716158C (en) * 1939-01-20 1942-01-14 Argus Motoren Ges M B H Device for utilizing the energy of the exhaust gases of an internal combustion engine
DE1152653B (en) * 1958-11-25 1963-08-08 Rheinische Kalksteinwerke Shaft furnaces for burning limestone or other carbonates with exhaust gas circulation
DE1214590B (en) * 1960-09-22 1966-04-14 Beckenbach Karl Gas or oil-heated shaft furnace for burning limestone, dolomite or the like.
DE1281111B (en) * 1961-06-21 1968-10-24 Beckenbach Karl Process for burning limestone or the like in a shaft furnace and shaft furnace operating according to this method
DE1558072A1 (en) * 1967-03-04 1970-03-19 Rheinische Kalksteinwerke Procedure for operating a shaft furnace
FR2316569A1 (en) * 1975-06-18 1977-01-28 Foster Wheeler Energy Corp DEVICE FOR RECOVERING THE HEAT FROM THE EXHAUST GASES OF A HEAT GENERATOR

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0281535A1 (en) * 1987-02-25 1988-09-07 PPS Project Promotion Services AB A heat and power co-generation plant
WO2008022941A1 (en) * 2006-08-22 2008-02-28 Rheinkalk Gmbh Annular shaft kiln

Also Published As

Publication number Publication date
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