EP0008667A1 - Four pour le traitement thermique de matières en particules de grosseur étalée - Google Patents

Four pour le traitement thermique de matières en particules de grosseur étalée Download PDF

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Publication number
EP0008667A1
EP0008667A1 EP79102695A EP79102695A EP0008667A1 EP 0008667 A1 EP0008667 A1 EP 0008667A1 EP 79102695 A EP79102695 A EP 79102695A EP 79102695 A EP79102695 A EP 79102695A EP 0008667 A1 EP0008667 A1 EP 0008667A1
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EP
European Patent Office
Prior art keywords
coolant
blower
shaft
gas
fan
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
EP79102695A
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German (de)
English (en)
Other versions
EP0008667B1 (fr
Inventor
Heinrich Buchner
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.)
Kloeckner Humboldt Deutz AG
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Kloeckner Humboldt Deutz AG
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Filing date
Publication date
Application filed by Kloeckner Humboldt Deutz AG filed Critical Kloeckner Humboldt Deutz AG
Priority to AT79102695T priority Critical patent/ATE67T1/de
Publication of EP0008667A1 publication Critical patent/EP0008667A1/fr
Application granted granted Critical
Publication of EP0008667B1 publication Critical patent/EP0008667B1/fr
Expired legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/02—Blade-carrying members, e.g. rotors
    • F01D5/08—Heating, heat-insulating or cooling means
    • F01D5/085—Heating, heat-insulating or cooling means cooling fluid circulating inside the rotor
    • 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
    • F27B1/06—Shaft or like vertical or substantially vertical furnaces of other than up-draught type

Definitions

  • the invention relates to a furnace for the heat treatment of mostly lumpy to fine-grained material, in particular a shaft furnace, rotary hearth furnace or the like for burning or sintering limestone, dolomite or magnesite, in which the fuel passes through a preheating zone, a combustion zone and a cooling zone and the combustion zone contains a gas or gas discharge device and a gas delivery device for generating a hot gas circulation.
  • a cross-flow shaft furnace which has gas collection devices and heating devices.
  • the hot gases required for sintering the fuel are collected in the gas collection devices after flowing through the material layer and again in the heating devices by means of injectors for the gas circulation heated up.
  • the funds required for the gas circulation are represented by the rigid injectors, which circulate an essentially constant throughput volume of hot gases. Faults occur in such a cross-flow shaft furnace in particular if the gas volume available to the respective injector is changed due to a changed bulk density in the shaft and thus a changed pressure resistance in the man-made column.
  • a cross-flow heated shaft kiln for limestone burning which has a preheating zone, two firing zones and a cooling zone in the passage direction of the material, each firing zone containing a quasi-closed hot gas circuit.
  • the hot gas circuit is brought about in that at least one jet blower or injector is assigned to each combustion zone and generates the kinetic energy required for the hot gas circulation.
  • the hot gases are circulated from the injector into a combustion chamber, a gas collection chamber, the assigned fuel bed, the exhaust gas collection chamber and a circulation channel back to the injector. Fuel and cooling air from the cooling zone are introduced into the combustion chamber.
  • the intensive hot gas circulation results in a very even fire across the entire shaft cross-section.
  • a heat treatment furnace in particular a shaft furnace for burning or sintering limestone, dolomite or magnesite, in such a way that furnace units of up to 400 tpd throughput, low specific, can be used with structurally simple means Energy consumption and high thermal efficiency can be built.
  • This object is achieved in that in the hot gas circulation, preferably between the gas extraction device and the combustion device as a gas delivery device, a delivery fan charged with coolant is arranged.
  • a delivery fan charged with coolant is arranged in the hot gas circulation system, which, in contrast to the rigid injectors previously used, easily generates a pressure drop of approx. 300 mm water column in the combustion zone, so that far larger amounts of gas per unit time are burned / sintering firing material can be introduced.
  • This conveying blower which is acted on with coolants, can therefore convey hot gases up to approximately 1200 ° C. in the circulation between the gas extraction device and the combustion device without the blower being exposed to thermal limit stresses.
  • the elaborate structural structures for the arrangement of the injectors on the combustion shaft can be dispensed with, so that overall the investment costs for the furnace system can be considerably reduced.
  • the cooled gas delivery fan is arranged in the hot circulation channel between the gas discharge chamber and the combustion chamber, resulting in a particularly compact and achieve compact furnace construction.
  • the conveying fan is arranged on the outside of the shaft and is connected to its cooling device with a self-contained coolant guide.
  • This has the advantage that highly effective coolants are fed to the blower in a closed circuit, so that the temperatures on the blower can be set precisely and the blower parts are never exposed to undesirably high temperature ranges.
  • the volatile constituents in the hot gases which tend to cake, crystallize directly on the relatively cold blower parts and are returned as solid constituents to the bulk material without the blower, even with a very high content of volatile harmful constituents in the hot gases Has caking. This ensures high operational reliability and availability of the blower and thus the entire furnace system.
  • the recooler of the fan cooling device serves as a heat exchanger for the fuels introduced into the combustion chamber.
  • the fan shaft and / or the fan wheel is hollow in the conveying fan and coolant-carrying devices, preferably coolant lines, are arranged in the hollow fan shaft or in the fan ring gear, thereby ensuring that the fan parts are specifically cooled there where the thermal stress from the hot gases is strongest.
  • coolant lines of the blower shaft are connected to the fixed coolant lines of the recooler via a stationary distributor head, which is preferably designed as an air-flowed honeycomb cooler or tube cooler. This design is particularly advantageous when the preheater does not require fuel preheating, such as with coal dust.
  • the coolant is then preferably recooled with the aid of a cooler through which air flows.
  • the coolant lines in the hollow blower shaft are formed from a hollow cylinder which is coaxially oriented at a distance from the hollow shaft, the coolant being supplied through the resulting outer annular space and the coolant being discharged through the hollow cylinder. In conjunction with the stationary distributor head, this results in optimal coolant guidance with the lowest hydraulic resistance. It is furthermore expedient that the coolant line in the fan wheel preferably runs in a meandering fashion at the outer end of each wheel blade, which ensures that, particularly where high heat loads are to be expected from the fan blades, optimal heat dissipation is achieved by means of increased coolant supply.
  • blower ring gear is connected to the hollow cylinder in the blower shaft via connecting lines in the wheel hub, so that an optimal coolant circulation, in particular on the thermally stressed parts of the blower, is achieved with simple constructional means.
  • the conveying fan and / or the fan parts are cooled by a coolant, preferably by a temperature-resistant organic or inorganic liquid which has a boiling point of more than 100 ° C. and circulates in a closed circuit.
  • a coolant preferably by a temperature-resistant organic or inorganic liquid which has a boiling point of more than 100 ° C. and circulates in a closed circuit.
  • This measure achieves high heat dissipation and thus improved cooling of the individual blower parts at a relatively low liquid temperature, as a result of which, in particular, heat peaks on the blower parts can be reduced.
  • the cross sections of the coolant lines can be chosen so small that coolant lines can also be laid in more complicated fan parts. Due to the closed circuit of the coolant, expensive, highly effective coolants can also be used, since the coolant does not have to be supplied again and again.
  • the cooling liquid for the blower is a heat transfer oil, in particular a silicone oil, whereby it is advantageously achieved that the desired working temperature of more than 100 ° C is achieved with a commercially available coolant. It is expedient that the working temperature of the cooling liquid is set between 200 and 270 ° C, preferably between 200 and 220 ° C.
  • the coolant circuit for the delivery fan is monitored by pressure switches, thermostats, flow meters, etc.
  • a direct-acting, safe system for monitoring the cooling circuit is available, which immediately indicates a rise in temperature and / or a throughput fault in the cooling liquid, so that immediate countermeasures can be initiated. This ensures reliable cooling of the blower with regard to the material properties.
  • a cross-flow heated shaft furnace 1 is partially shown in section.
  • the furnace shaft 2 is divided into an upper preheating zone V, two firing zones B 1 / B 2 arranged below it and a cooling zone K.
  • At the lower end of the shaft is a device, not shown, for the continuous removal of the fired material.
  • the rectangular shaft 2 consists of two gas collection chambers 3 and 4 arranged on both sides of the shaft, of which the gas collection chamber 3, the gas supply chamber and the gas collection chamber 4, the gas train chamber.
  • the shaft wall 6 provided with gas passage openings 5 runs between these two chambers.
  • the firing material 7 moves from top to bottom in a dense column of firing material.
  • the gas supply chamber 3 is connected to a combustion chamber 8, into which a combustion device 9 and a fresh air line 13 are guided, through which hot air from the cooling zone K is conducted as combustion air into the combustion chamber 8.
  • the gas discharge chamber 4 has a discharge opening 10 in the upper region, to which a circulation channel 11 is connected, which in turn is guided into the combustion chamber 8.
  • a conveying fan 12 charged with coolants is arranged to maintain a closed hot gas circulation in the combustion zone B 2 .
  • a branch line from the fresh air line 13 can be connected to the circulation channel 11.
  • the combustion chamber 8, the combustion device 9 and the conveying fan 12 arranged in the circulation duct 11 are arranged outside * of the shaft and are therefore shown in broken lines.
  • the conveying fan 12 is connected to a cooling device 14 which is arranged outside the shaft and has a closed coolant guide.
  • the supply of the cooling liquid to the hot gas blower 12 takes place through line 15 and the return to the air-cooled warm cooler 1 through line 17.
  • the lines 15, 17 contain the measuring and control devices required for monitoring the coolant circuit, in each case in each supply and return line 15, 17 a pressure switch 18 and a quick-closing thermostat valve 19.
  • the lines 15 and 17 have flow meters 20 for the cooling liquid, which are designed as orifice meters with a differential pressure manomet.
  • a pneumatic valve 21 is arranged in line 15 for quick shutdown of the coolant supply.
  • an expansion tank 22 for compensating for the change in volume of the coolant is arranged at the highest point of the circuit, and a filler and refill tank 24 for the coolant is located in front of the coolant pump 23.
  • the honeycomb cooler 16 is air-cooled and equipped with an adjustable cooling fan 25.
  • FIG. 2 shows, in section and in an enlarged view, the conveying fan 12 arranged on the outside of the shaft in the circulation channel 11, in particular the fan shaft 26 and the fan wheel 27. Both the fan shaft 26 and the fan wheel 27 are hollow.
  • a hollow cylinder 28 is arranged coaxially in the hollow hollow shaft 26 at a distance from the hollow shaft itself, the coolant being supplied through the resulting outer annular space 32 and being discharged through the hollow cylinder 28.
  • the coolant annulus as well as the hollow cylinder are connected via a stationary distributor head 29 to the stationary coolant lines 15 and 17, which in turn form a closed coolant circuit with the honeycomb cooler 16 through which air flows.
  • the distributor head 29 is surrounded by a leakage housing known per se.
  • each wheel blade 30 there are arranged guide plates 31 which run in a meandering band shape and to which the coolant is supplied from the annular space 32 of the fan shaft 26 via a line 33 arranged in the fan wheel.
  • the interior of the blower ring gear 27 is connected to the hollow cylinder 28 via a connecting line 34 which are arranged in the wheel hub 35 of the blower wheel 27.
  • the hot gases generated in the combustion chamber 8 flow from the combustion chamber into the gas collection chamber 3 and from there through the gas passage openings 5 in the shaft wall 6 transversely to the throughput direction of the Fired goods into the densely packed fired goods layer, enter the gas discharge chamber 4 on the other side of the bed through the gas passage openings 5 and are collected there.
  • the hot gas is sucked out of the gas discharge chamber 4 via the discharge opening 10 into the circulation channel 11 by means of the delivery fan 12, which is thus directly in a hot gas flow of approximately 800 ° C. to 1200 ° C.
  • the conveying fan 12 feeds the hot gas to the combustion chamber 8, into which fuels are introduced via the combustion device 9 and burn out there in the atmosphere enriched with preheated fresh air.
  • the kinetic energy required for the multiple circulation of the hot gases in the combustion zone is supplied to the hot gas circuit in each combustion zone B, the fan allowing an exactly adjustable pressure drop of at least 350 mm / WS within each combustion zone.
  • an intensive gas circulation with a high throughput volume is generated, so that the amount of heat that is required for an optimal firing can always be supplied to the firing material located in the firing zone, even with high firing material throughput, so that even very fine stones can be fired.
  • sealing zones are arranged between each combustion zone B 1 / B 2 , which allow hot gases to flow out into the overlying combustion zone or preheating zone prevent.
  • the combustible material that descends from the combustion zone into the cooling zone K is cooled in this by supplied cooling air 36 to a corresponding further processing temperature and processed further by means of extraction elements (not shown).
  • the cooling air heated in the cooling zone releases the amount of heat absorbed by the material to be burned into the combustion chamber 8 as combustion air.
  • a portion of the hot gases generated in the combustion zones B 1 and B 2 is branched off from the combustion zones and fed to the lumpy material in the preheating zone for preheating it via lines not shown in the furnace 1.
  • the conveying fan 12 is connected via the distributor head 29 to a closed cooling circuit 14 which is designed as described above.
  • the cooling of the blower with the cooling device takes place by means of a temperature-resistant heat transfer oil, in particular a silicone oil, which is regulated to a working temperature between 200 and 220 ° C, for which purpose corresponding control devices, such as pressure switch 18, thermostatic valve 19 and flow meter 20, are located in the fixed coolant lines of the cooling device are arranged.
  • a temperature-resistant heat transfer oil in particular a silicone oil, which is regulated to a working temperature between 200 and 220 ° C, for which purpose corresponding control devices, such as pressure switch 18, thermostatic valve 19 and flow meter 20, are located in the fixed coolant lines of the cooling device are arranged.
  • blower parts heated to a maximum of 240 ° C in the hot gas stream which volatilize from the combustible, harmful and prone to caking alkali or sulfur compounds, cool down and crystallize from the hot gases, so that the Ge blower or on the fan blades can not form approaches that either negatively affect the throughput characteristics of the fan or lead to increased bearing loads on the fan.
  • blower which is cooled with a heat transfer oil in a closed circuit, directly in the hot gas circulation of the combustion zone of a cross-flow heated shaft furnace, it has become possible for the first time to generate such a high pressure drop in each combustion zone, and thus to provide such a high kinetic energy for the hot gas circulation that furnace units with double the throughput compared to the crossflow furnaces previously equipped with injectors.
  • the present invention is not only limited to cross-flow heated shaft furnaces for burning or sintering limestone, dolomite or magnesite, but can also be used wherever blowers must be used directly in a hot gas stream in order to generate the kinetic energy required for gas production.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Furnace Details (AREA)
  • Tunnel Furnaces (AREA)
  • Crucibles And Fluidized-Bed Furnaces (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
EP79102695A 1978-08-18 1979-07-30 Four pour le traitement thermique de matières en particules de grosseur étalée Expired EP0008667B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT79102695T ATE67T1 (de) 1978-08-18 1979-07-30 Ofen zur waermebehandlung von stueckigem bis feinkoernigem gut.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19782836162 DE2836162A1 (de) 1978-08-18 1978-08-18 Ofen zur waermebehandlung von meist stueckigem bis feinkoernigem gut
DE2836162 1978-08-18

Publications (2)

Publication Number Publication Date
EP0008667A1 true EP0008667A1 (fr) 1980-03-19
EP0008667B1 EP0008667B1 (fr) 1981-05-13

Family

ID=6047346

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79102695A Expired EP0008667B1 (fr) 1978-08-18 1979-07-30 Four pour le traitement thermique de matières en particules de grosseur étalée

Country Status (6)

Country Link
US (1) US4252521A (fr)
EP (1) EP0008667B1 (fr)
JP (1) JPS5531298A (fr)
AT (1) ATE67T1 (fr)
DE (2) DE2836162A1 (fr)
SU (1) SU932999A3 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102092968A (zh) * 2011-01-07 2011-06-15 重庆京庆重型机械有限公司 石灰焖烧炉
CN101745783B (zh) * 2009-12-14 2011-07-20 成都天保重型装备股份有限公司 煅烧炉炉体制作工艺

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3209836A1 (de) * 1982-03-18 1983-09-29 Dolomitwerke GmbH, 5603 Wülfrath Verfahren zur herstellung von sinterdolomit in einem schachtofen sowie schachtofen zur durchfuehrung des verfahrens
JPH0543227Y2 (fr) * 1987-12-21 1993-10-29
CN102627418B (zh) * 2012-04-26 2013-08-21 石家庄新华能源环保科技股份有限公司 一种复合式石灰窑

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1653217A (en) * 1927-12-20 Combustion turbine
US2369795A (en) * 1941-11-17 1945-02-20 Andre P E Planiol Gaseous fluid turbine or the like
DE1034090B (de) * 1956-07-14 1958-07-10 Roechlingsche Eisen & Stahl Querstrombeheizter Schachtofen zum Erhitzen von Schuettgut, insbesondere zum Brennenvon Kalkstein
DE1197798B (de) * 1963-10-12 1965-07-29 Sofim Saar Saarofenbau Fuer In Verfahren zum Brennen von Kalkstein und Vorrichtung zur Durchfuehrung des Verfahrens
DE1241041B (de) * 1961-12-27 1967-05-24 Kloeckner Humboldt Deutz Ag Querstromofen zum Brennen von Kalk, Dolomit od. dgl.
FR1585178A (fr) * 1967-09-08 1970-01-09
DE1558057B1 (de) * 1967-02-23 1970-07-30 Kloeckner Humboldt Deutz Ag Querstromschachtofen
US3936220A (en) * 1974-08-26 1976-02-03 Controls Southeast, Inc. Jacket construction for fluid-circulating pumps

Family Cites Families (11)

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Publication number Priority date Publication date Assignee Title
US1713237A (en) * 1928-01-11 1929-05-14 Pacific Abrasive Supply Compan Drier
US2345067A (en) * 1939-08-17 1944-03-28 Osann Bernhard Method of and apparatus for operating shaft furnaces for roasting and the like
US2393963A (en) * 1944-09-22 1946-02-05 Adolph L Berger Turbine wheel
US2455313A (en) * 1945-02-19 1948-11-30 Irving B Osofsky Heat exchanging airplane propeller
US2778601A (en) * 1951-05-28 1957-01-22 Ernst R G Eckert Fluid cooled turbine blade construction
US2883151A (en) * 1954-01-26 1959-04-21 Curtiss Wright Corp Turbine cooling system
US2948521A (en) * 1956-07-14 1960-08-09 Roechlingsche Eisen & Stahl Process and apparatus for heating a cross stream shaft furnace in view of heating solid materials, particularly for the calcination of limestone
US2952441A (en) * 1956-12-10 1960-09-13 Int Harvester Co Cooling construction for gas turbine blades
US3311344A (en) * 1964-12-08 1967-03-28 John V Yost Turbine wheel
FR1440786A (fr) * 1965-04-21 1966-06-03 Sofim Saar Saarofenbau Fuer In Procédé pour la cuisson de calcaire et dispositif pour effectuer ce procédé
US3544096A (en) * 1968-05-22 1970-12-01 Kloeckner Humboldt Deutz Ag Cross-current blast furnace

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1653217A (en) * 1927-12-20 Combustion turbine
US2369795A (en) * 1941-11-17 1945-02-20 Andre P E Planiol Gaseous fluid turbine or the like
DE1034090B (de) * 1956-07-14 1958-07-10 Roechlingsche Eisen & Stahl Querstrombeheizter Schachtofen zum Erhitzen von Schuettgut, insbesondere zum Brennenvon Kalkstein
DE1241041B (de) * 1961-12-27 1967-05-24 Kloeckner Humboldt Deutz Ag Querstromofen zum Brennen von Kalk, Dolomit od. dgl.
DE1197798B (de) * 1963-10-12 1965-07-29 Sofim Saar Saarofenbau Fuer In Verfahren zum Brennen von Kalkstein und Vorrichtung zur Durchfuehrung des Verfahrens
DE1558057B1 (de) * 1967-02-23 1970-07-30 Kloeckner Humboldt Deutz Ag Querstromschachtofen
FR1585178A (fr) * 1967-09-08 1970-01-09
US3936220A (en) * 1974-08-26 1976-02-03 Controls Southeast, Inc. Jacket construction for fluid-circulating pumps

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101745783B (zh) * 2009-12-14 2011-07-20 成都天保重型装备股份有限公司 煅烧炉炉体制作工艺
CN102092968A (zh) * 2011-01-07 2011-06-15 重庆京庆重型机械有限公司 石灰焖烧炉

Also Published As

Publication number Publication date
US4252521A (en) 1981-02-24
EP0008667B1 (fr) 1981-05-13
DE2960351D1 (en) 1981-08-20
SU932999A3 (ru) 1982-05-30
JPS5531298A (en) 1980-03-05
ATE67T1 (de) 1981-05-15
DE2836162A1 (de) 1980-02-28

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