US3204936A - Shaft furnace - Google Patents

Shaft furnace Download PDF

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Publication number
US3204936A
US3204936A US190729A US19072962A US3204936A US 3204936 A US3204936 A US 3204936A US 190729 A US190729 A US 190729A US 19072962 A US19072962 A US 19072962A US 3204936 A US3204936 A US 3204936A
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Prior art keywords
combustion
furnace
shaft
zone
air
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Expired - Lifetime
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US190729A
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English (en)
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Beckenbach Karl
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WARMESTELLE STEINE und ERDEN A GERMAN CORP GmbH
WARMESTELLE STEINE und ERDEN GmbH
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Assigned to WARMESTELLE STEINE UND ERDEN GMBH, A GERMAN CORP. reassignment WARMESTELLE STEINE UND ERDEN GMBH, A GERMAN CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: BECKENBACH, KARL
Assigned to WARMESTELLE STEINE UND ERDEN GMBH reassignment WARMESTELLE STEINE UND ERDEN GMBH ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: BECKENBACH, HELMUTH, BECKENBACH, KARL BY HELMUTH BECKENBACH, ATTORNEY IN FACT, BECKENBACH, ULRICH
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Assigned to BARCLAYS-AMERICAN/BUSINESS CREDIT, INC., 111 FOUNDERS PLAZA, EAST HARTFORD, CT. 06108 A CT. CORP. reassignment BARCLAYS-AMERICAN/BUSINESS CREDIT, INC., 111 FOUNDERS PLAZA, EAST HARTFORD, CT. 06108 A CT. CORP. SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FULLER COMPANY
Assigned to FULLER COMPANY reassignment FULLER COMPANY RELEASED BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: BARCLAYS BUSINESS CREDIT, INC., A CORP OF CT
Expired - Lifetime legal-status Critical Current

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    • 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

Definitions

  • the invention relatesto a shaft furnace for heat treatment of a fluent mass of solid material such as limestone, dolomite, magnesite and similar material introduced in the upper end of the furnace and descending therein through the following sections or zones a preheating section, a combustion section and a cooling section before being discharged from the lower furnace end, there being provided means for introducing cooling air at the lower part of said cooling section into the descending material to flow upward therein in heat absorbing relation therewith, means for introducing fluid fuel into the combustion section at spaced points of said section and means for escape of the combustion gases at the upper end of the furnace.
  • a fluent mass of solid material such as limestone, dolomite, magnesite and similar material
  • furnace temperatures in the lower region of the firing or combustion zone or section are intended to be kept lower than in the upper region of the said zone. This is in order to avoid over-combustion of the material being burnt, and is of importance especially in the production of soft-burnt lime.
  • the temperatures in the lower region of the firing or combustion zone should not exceed about l150 at any point.
  • the invention adopts another way of attaining the desired low combustion temperatures in the lower region of the combustion section or zone, and at the same time preventing excessive temperatures in the whole region of the combustion zone. According to the invention, this is done by taking the exhaust gas not from the upper, but from the lower part of the combustion section or zone, with the result that the described disadvantages resulting from take-off from the upper combustion zone are avoided. Exhaust gas can be taken from the lower combustion zone at temperatures which are substantially more constant than at the upper combustion zone. Since the attainment of soft-burnt lime anyhow involves the use of all means to keep temperatures in the lower combustion zone lower than in the upper combustion zone, i.e.
  • At least some of the exhaust gases and the air required for their combustion flow downwards in the lower region of the combustion zone with the material column falling in the furnace.
  • the exhaust gas and cooling air can be mixed with one another as soon as they are taken off, and extracted together from the material column, as described below in the description.
  • the exhaust gas and cooling air may, however, also be taken off at points arranged at a distance from one another in the vertical direction, so that a so-called stewing zone, in which gases do not flow through the material or flow through it only to a small extent, remains between the extraction points or between the combustion zone and the cooling zone.
  • the large excess of air used here in order to attain low soft-burning temperatures in conjunction with the admixed exhaust gas is thus constant over the whole crosssection and at all parts thereof, so that a uniform and low combustion can be maintained everywhere here.
  • the downward flow used here furthermore has the great advantage that falling temperatures occur in just that part of the furnace in which the last fine-burning occurs.
  • Acceleration may be imparted to the reversed exhaust gas or mixture of exhaust gas and cooling air, or if desired only to the cooling air, by injectors operated with additional air at higher pressure, or with heating gas fed is at higher pressure in the case of a gas heated furnace, or this may also be done by fans.
  • a tubular insert arranged concentrically with respect to the axis of the furnace is provided for this purpose in the furnace shaft.
  • the hollow space in this insert is provided with inlet apertures at the height of the lower end of the combustion zone, and with outlet apertures at the height of the fuel feed points to the upper combustion zone, and gases from the shaft enter and emerge from the hollow space respectively through the said apertures.
  • the shaft insert with gas-inlet apertures at the lower end of the combustion zone and gas outlet apertures at higher points on the shaft may, however, also be used merely for diverting the cooling air, in which case the cooling air emerges into the shaft either directly at these higher points or via pipes inside ribs connecting the insert to the walls of the furnace, is fed to the fuel feed points and then passes, mixed with fuel, into thhe shaft.
  • FIGURE 1a is a fragmentary vertical cross-sectional view showing the middle portion of a shaft furnace having a blower fan for extracting exhaust gas and cooling air in the region of the lower combustion zone of the furnace.
  • FIGURE lb is a fragmentary vertical cross-sectional view of a shaft furnace similar to FIGURE la but showing an injector type device for taking off and extracting exhaust gas and cooling air.
  • FIGURE 2 is a vertical cross-sectional view of a modified form of the invention and FIGURE 3 is a horizontal cross-sectional view taken on line 3-3 of FIGURE 2 and looking in the direction of the arrows.
  • Each of the furnaces diagrammatically shown in the figures comprises in its wall 10 two galleries of fuel-feed points uniformly distributed over the periphery of the furnace, only three being illustrated or indicated in each case in the elevations shown.
  • the fuel-feed points in the upper gallery arranged in the upper part of the combustion zone are designated by 12, and those in the lower gallery arranged in the lower part of the combustion zone by 14.
  • the number of fuel-feed points, at each of which there may be one or more burners, may also be greater or less than four.
  • the fuel-feed points in one gallery may either be at the same height or be graduated in height,
  • the precombustion chambers for the lower feed points are designated by 1511, and those for the upper ones by .1512.
  • different forms of devices for accelerating exhaust gas or air taken from the furnace which device takes the form of fans in the case of the arrangement shown on the left hand side of these figures, and injectors in the case of the arrangement shown in the right hand side.
  • throttle valves or the like in the pipe system, in order to regulate the composition of the exhaust gas-air mixture flowing in from the fan or injector, or to regulate the distribution of the accelerated mixture to the fuel feed points in the upper and lower combustion zones.
  • FIGURES 1a and lb there is a central insert 59a in the middle of the shaft, which extends as far as the base (not illustrated) of the furnace, and is supported there.
  • Gas accelerating devices 30 and 32 are used with this arrangement also.
  • the exhaust gas-air mixture rising in the cylindrical space 53 is fed through apertures 55 and pipes 57 arranged in roof-shaped ribs 56 to an annular collector pipe 58, whence it is aspirated via a pipe 59 by the fan 30 or the injector 32.,
  • the gas passes from the pressure side of the device 30, 32 to the fuel feed points 12, 14-.
  • FIGURES 2-3 show a further form of embodiment of a shaft furnace working in accordance with the process of the invention, and comprising a tubular middle portion to the furnace in a similar manner to the form of embodimcnt shown in FIGURES la-1b.
  • the middle portion of the furnace takes the form of a cylindrical insert 61, which is suspended from girders 62 fastened in the upper end of the furnace, and consists of a double-walled steel cylinder 63 with a fireproof lining 65 over its whole length externally and also towards the bottom internally.
  • the steel cylinder is provided, in those portions having a fireproof sheathing, with projecting sheet-metal ribs to support the radial bricks of the lining. These sheet-metal ribs are not illustrated.
  • the annular duct 66 disposed between the two walls of the steel cylinder 63 serves to guide cooling air, as described below in detail.
  • the hollow space 67, open at the bottom, in the lower part of the insert is closed at the top, approximately at the height of the lower end of the upper combustion zone, by a partition 68 made of fireproof material.
  • the shaft insert 61 is attached to the furnace wall 59 by a number of radially extending angular ribs, hereinafter also called roof ribs on account of their roof-like design.
  • roof ribs there are two rows or stories of roof ribs at a distance from one another in the region of the combustion zone of the furnace, the upper ones being designated by 70, and the lower ones by 71.
  • the ridge-line of the roof ribs 71 is designated by 71a in FIGURE 3.
  • the upper and lower roof ribs 70 and 71, whereof there are five each in the example of embodiment shown, are
  • Each of the ribs 70 and 71 comprises two passages.
  • the upper of these passages 72 are connected at their inner ends to the annular duct 66. Their outer ends pass through the furnace wall and are open, so that ambient air can pass into the annular duct 66, and can be led into the open, from the upper end of the shaft insert, through a boxed in girder and a chimney-like tube 94 fastened thereto.
  • the lower passages 75 are in communication at their inner ends with the hollow space 67. Their outer ends are disposed inside extensions 76 projecting from the furnace wall. In these extensions 76 there are pre-combustion chambers 77 with a highly fire-proof lining beneath the passages 75, and the inner ends of the said chambers open out into the hollow spaces in the material filling which are present beneath the roof ribs. There are burners 78 at the outer ends of the pre-combustion chambers.
  • the lower passages 75 are bent up near their outer ends.
  • connector tubes 79 extending obliquely downwards in the direction of an extension 76 adjacent to the said ends, the said tubes being designated after the manner of injectors.
  • These tubes 79 designated after the manner of injectors open out tangentially at 80 into the pre-cornbustion chambers of the adjacent extension.
  • the driving air feed tube 81 projecting into the injector tube 79 is connected to an annular pipe 82 to which the primary air pipes 83 for the burners 76 are also connected.
  • the pipes 81 and 83 are provided with regulator members which are not illustrated.
  • the annular pipe 82 is connected to the outlet tube 84, emerging from the upper end of the furnace, of a recuperator 85 suspended from the girders 62 into the upper end of the insert 61.
  • the recuperator 85 consists of a substantially cylindrical hollow member 86, subdivided into a small upper exhaust gas chamber 87 and a large lower air chamber 88. Some of the exhaust gas leaving the combustion zone flows into the insert through apertures 89 in the Walls thereof, and then through tubes 90 passing through the air chamber 88 into the exhaust-gas chamber 87 of the recuperator, from which it is fed via a pipe 91 to the suction union of an exhaust gas fan 92, whence the exhaust gas flowing to the upper end of the furnace through the material is aspirated via a tube 93.
  • the proportion of exhaust gas flowing through the recuperator may be regulated by setting regulator members 94a and 94b.
  • the upper end of the air chamber 88 of the recuperator is connected via a pipe 95 extending through the exhaust gas chamber to the pressure side of a fresh-air fan not illustrated.
  • the hot air outlet tube 84 passes through this pipe 95, and extends as far as the vicinity of the lower end of the air chamber 88.
  • the air rising in the cooling zone may be forced into the lower end of the furnace by a fresh-air fan not shown.
  • the new furnace arrangement may be operated in various ways. For example, if the furnace is to serve for producing a soft-burnt lime, it is desirable on the one hand, in order to attain a high degree of heat economy, for the limestone to be so intensively de-acidified at high combustion-gas temperatures in the upper region of the combustion zone, but with the smallest possible excess of air, that the de-acidification process has already made a large amount of progress when the limestone reaches the lower region of the combustion zone. On the other hand, a temperature of about 1150 C. should if possible not be exceeded during the remainder of de-acidification in the lower region of the combustion zone.
  • Both conditions are complied with in the new furnace arrangement, for example if the smaller proportion of the fuel in the region of the lower combustion zone is fed via the lower story of burners or combustion spaces 77 arranged approximately in the middle of the said zone, and is burnt there with a large excess of air, the speed of the air aspirated through the passages 75 in the lower roof ribs 71 from the hollow space 67 being so set by suitable regulation of the driving air feed that some of the exhaust gases emerging from the combustion spaces 77 into the hollow spaces under the roof ribs 71 flow downwards in a steady flow with the material. This downwardly flowing part of the exhaust gases is completely burnt upon reaching the lower end of the shaft insert 61.
  • the exhaust gas temperature is also relatively low because of the large excess of air, so that the temperature of the limestone in that region of the shaft through which these gases flow can be kept to the desired level (about 1150 C.) and below.
  • the exhaust gases still containing a large amount of excess air mix at the lower end of the shaft insert with the cooling air rising from the cooling zone of the furnace without increasing the temperature of the said air to an inadmissibly high value.
  • the major part of the fuel is burnt with a small excess of air, or even starved of air, in the pre-combustion chambers disposed in the upper story of burners 78 and pre-combustion chambers 77 situated substantially at the lower end of the upper combustion zone, and all the air available for combustion purposes in that part of the furnace immediately above the roof ribs 70 is made up of the air component of the already strongly heated exhaust gas-air mixture aspirated via the passages 75 in the upper roof ribs 70, the driving air pre-heated in the recuperator, the air component of that part of the exhaust gases flowing directly upwards from the roof ribs 71 and the primary air coming from the recuperator for atomisation and pre-combustion of the fuel.
  • a shaft furnace for heat treating a fluent mass of solid material such as limestone, dolomite, magnesite and similar materials introduced in the upper end of the furnace shaft and descending through preheating, combustion and cooling zones before being discharged from the lower end of the furnace
  • said shaft furnace including a cylindrical wall, means for introducing air at the lower portion of said cylindrical wall and the lower portion of said cooling zone into the descending material to flow upward therein in heat absorbing relation therewith, circumferentially spaced combustion chambers disposed in said cylindrical wall located at upper and lower levels in communication with said combustion zone located at vertically spaced points of said combustion zone, burner means located in each of said combustion chambers for burning fluid fuel in said chambers, vertical tubular conduit means comprising a tubular member concentrically arranged in said shaft through which cooling air and exhaust gases of combustion are withdrawn from said shaft furnace, second conduit means having one end connected with said vertical tubular conduit at a point intermediate said cooling zone and the points of communication of said upper combustion chambers, a gas accelerating means having suction and pressure sides,
  • a shaft furnace for heat treating a fluent mass of solid material such'as limestone, dolomite, magnesite and similar materials introduced in the upper end of the furnace shaft and descending through preheating, combustion and cooling zones before being discharged from the lower end of the furnace, said furnace comprising means for introducing air at the lower portion of said cooling zone into the descending material to flow upward therein 'in heat absorbing relation therewith, upper and lower combustion spaces disposed in the shaft wall communicating with said combustion zone at vertically spaced points of said combustion zone, burner means in each of said combustion spaces for burning fluid fuel in said spaces, conduit means through which cooling air and exhaust gases are withdrawn from said shaft, said conduit means comprising a hollow vertically extending member within said shaft furnace, said conduit means being in communication adjacent one end with said shaft in the area of said cooling zone and said points of communication of said lower combustion spaces, gas accelerating means having suction and pressure sides, first duct means connecting said conduit means to the suction side of said gas accelerating means with the pressure side of said gas accelerating means connected by second
  • a shaft furnace for heat treating a fluent mass of solid material such as limestone, dolomite, magnesite and similar materials introduced in the upper end of the furnace shaft and descending through preheating, combustion and cooling zones before being discharged from the lower end of the furnace, said furnace comprising a shaft wall, means for introducing cooling air at the lower portion of said cooling zone into the descending material to flow upward therein in heat absorbing relation therewith, combustion chambers at upper and lower levels disposed adjacent said shaft Wall communicating with said combustion zone at vertically spaced points of said Zone, burner means in each of said combustion spaces for burning fluid fuel in said spaces, first conduit means through which cooling air is withdrawn from said shaft, said first conduit means comprising a vertical tubular member arranged in said shaft in communication at one end with said shaft at the upper end of said cooling zone, second conduit means connected to said first conduit means through which exhaust gases are withdrawn from said shaft, gas accelerating means having suction and pressure sides, said second conduit means being connected at one end with said first conduit means intermediate said points of communication of said upper and lower
  • a shaft furnace for heat treating a fluent mass of solid material such as limestone, dolomite, magnesite and similar materials introduced in the upper end of the furnace shaft and descending through preheating, combustion and cooling zones before being discharged from the lower end of the furnace, said furnace comprising means for introducing cooling air at the lower portion of said cooling zone into the descending material to flow upward therein in heat absorbing relation therewith, upper and lower combustion spaces disposed adjacent the shaft wall communicating with said combustion zone at vertically spaced points of said combustion zone, burner means in each of said combustion spaces for burning fluid fuel in said spaces, conduit means comprising a central vertical tubular member in spaced relation from said shaft through which cooling air and exhaust gases are withdrawn from said shaft at the upper end of said cooling zone, said vertical tubular member extending at least through the lower combustion zone and being connected to the furnace wall by radially extending ribs disposed intermediate the points of communication of said upper and lower combustion spaces, said tubular member being provided in its wall with at least one gas inlet opening disposed at the upper end of said furnace
  • a shaft furnace for heat treating a fluent mass of solid material such as limestone, dolomite, magnesite and similar materials introduced in the upper end of the furnace shaft and descending through preheating, combustion and cooling zones before being discharged from the lower end of the furnace, said furnace comprising means for introducing cooling air at the lower portion of said cooling zone into the descending material to flow upward therein in heat absorbing relation therewith, upper and lower combustion spaces disposed adjacent the shaft wall communicating with said combustion zone at vertically spaced points of said combustion zone, burner means in each of said combustion spaces for burning fluid fuel in said spaces, conduit means through which cooling air and exhaust gases are withdrawn from said shaft at the upper end of said cooling zone, said conduit means comprising a hollow space within a vertical tubular member being disposed centrally in the furnace, extending at least through the lower combustion zone and being connected to the furnace Wall by substantially radially extending ribs disposed immediately above said points of communication of said upper and lower combustion spaces, the lower open end of said member being disposed at the upper end of said cooling zone and
  • tubular member is an insert suspended from girders arranged in the upper end of the furnace.
  • a shaft furnace for heat treating a fluent mass of solid material such as limestone, dolomite, magnesite and similar materials introduced in the upper end of the furnace shaft and descending through preheating, combustion and cooling zones before being discharged from the lower end of the furnace, said furnace comprising means for introducing cooling air at the lower portion of said cooling zone into the descending material to flow upward therein in heat absorbing relation therewith, upper and lower combustion spaces disposed adjacent the shaft wall communicating with said combustion zone at vertically spaced points of said combustion zone, burner means in each of said combustion spaces for burning fluid fuel in said spaces, vertically extending tubular conduit means in said shaft through which cooling air and exhaust gases are withdrawn from said shaft, second conduit means connected at one end with said shaft and at the other end to said first mentioned conduit means adjacent the upper end of said cooling zone, gas accelerating means having pressure and suction sides, the first one end of said last named conduit means being connected to the suction side of said gas accelerating means, duct means for connecting the pressure side of said gas accelerating means directly to said combustion spaces in

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Air Supply (AREA)
  • Combustion Of Fluid Fuel (AREA)
US190729A 1961-06-21 1962-04-27 Shaft furnace Expired - Lifetime US3204936A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEB62980A DE1281111B (de) 1961-06-21 1961-06-21 Verfahren zum Brennen von Kalkstein od. dgl. in einem Schachtofen und nach diesem Verfahren arbeitender Schachtofen

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US3204936A true US3204936A (en) 1965-09-07

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US190729A Expired - Lifetime US3204936A (en) 1961-06-21 1962-04-27 Shaft furnace

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US (1) US3204936A (no)
BE (1) BE615274A (no)
CH (1) CH407853A (no)
DE (1) DE1281111B (no)
GB (2) GB986848A (no)
NO (1) NO116379B (no)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3373981A (en) * 1964-05-29 1968-03-19 Didier Werke Ag Apparatus for operating a burner fired shaft furnace
US3887326A (en) * 1971-02-08 1975-06-03 Ici Ltd Kilns and furnaces
US4403951A (en) * 1981-06-27 1983-09-13 Ulrich Beckenbach Shaft furnace for burning or firing and sintering material in lump form or pellet form and with an internal burner
US4431407A (en) * 1981-10-13 1984-02-14 Ulrich Beckenbach Process for burning limestone, dolomite or the like and annular shaft furnace for performing the same
US4452584A (en) * 1981-12-25 1984-06-05 Ulrich Beckenbach Ring shaft kiln for calcining materials and a method of operation
EP1555251A3 (de) * 2004-01-15 2009-02-18 Maerz-Ofenbau AG Verfahren zum Brennen von körnigem, mineralischem Brenngut
CN101592436B (zh) * 2009-07-02 2010-09-29 江苏中圣园科技股份有限公司 三筒同心竖窑

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2826167C2 (de) * 1978-06-15 1985-04-04 Wärmestelle Steine und Erden GmbH, 4000 Düsseldorf Ringschachtofen zum Brennen von stückigem Brenngut
WO1982002762A1 (en) * 1981-02-04 1982-08-19 Steine & Erden Gmbh Waermestel Method and furnace for the combustion of materials such as limestone,dolomite,magnesite or the like,and utilisation of this furnace
MX167798B (es) * 1985-05-29 1993-04-12 D D Agrosa S David Procedimiento de calcinacion de materiales solidosy horno de columna sencilla para realizarlo
DE3914700A1 (de) * 1989-05-04 1990-11-08 Beckenbach Waermestelle Gmbh Dachrippe fuer schachtoefen

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2742276A (en) * 1953-04-08 1956-04-17 Azbe Corp Calcining apparatus for producing lime or the like
US2884237A (en) * 1955-10-20 1959-04-28 Erie Mining Co Chunk breaker for rectangular furnace
GB870649A (en) * 1959-02-17 1961-06-14 Charles Frederick Priest Improvements in or relating to furnaces or kilns for calcining solid material
US3033545A (en) * 1959-10-01 1962-05-08 Azbe Corp Firing apparatus for kilns
US3142480A (en) * 1961-06-08 1964-07-28 Azbe Corp Calcining apparatus

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE976930C (de) * 1951-09-21 1964-09-03 Rheinische Kalksteinwerke Gasbeheizter Schachtofen fuer Kalkstein, Dolomit oder Magnesit

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2742276A (en) * 1953-04-08 1956-04-17 Azbe Corp Calcining apparatus for producing lime or the like
US2884237A (en) * 1955-10-20 1959-04-28 Erie Mining Co Chunk breaker for rectangular furnace
GB870649A (en) * 1959-02-17 1961-06-14 Charles Frederick Priest Improvements in or relating to furnaces or kilns for calcining solid material
US3033545A (en) * 1959-10-01 1962-05-08 Azbe Corp Firing apparatus for kilns
US3142480A (en) * 1961-06-08 1964-07-28 Azbe Corp Calcining apparatus

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3373981A (en) * 1964-05-29 1968-03-19 Didier Werke Ag Apparatus for operating a burner fired shaft furnace
US3887326A (en) * 1971-02-08 1975-06-03 Ici Ltd Kilns and furnaces
US4403951A (en) * 1981-06-27 1983-09-13 Ulrich Beckenbach Shaft furnace for burning or firing and sintering material in lump form or pellet form and with an internal burner
US4431407A (en) * 1981-10-13 1984-02-14 Ulrich Beckenbach Process for burning limestone, dolomite or the like and annular shaft furnace for performing the same
US4452584A (en) * 1981-12-25 1984-06-05 Ulrich Beckenbach Ring shaft kiln for calcining materials and a method of operation
EP1555251A3 (de) * 2004-01-15 2009-02-18 Maerz-Ofenbau AG Verfahren zum Brennen von körnigem, mineralischem Brenngut
CN101592436B (zh) * 2009-07-02 2010-09-29 江苏中圣园科技股份有限公司 三筒同心竖窑

Also Published As

Publication number Publication date
GB986849A (en) 1965-03-24
NO116379B (no) 1969-03-17
BE615274A (fr) 1962-09-19
GB986848A (en) 1965-03-24
CH407853A (de) 1966-02-15
DE1281111B (de) 1968-10-24

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Date Code Title Description
AS Assignment

Owner name: WARMESTELLE STEINE UND ERDEN GMBH; KLEVER STRASSE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:BECKENBACH, KARL;REEL/FRAME:003935/0190

Effective date: 19811109

AS Assignment

Owner name: WARMESTELLE STEINE UND ERDEN GMBH, KLEVER STRASSE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:BECKENBACH, KARL BY HELMUTH BECKENBACH, ATTORNEY IN FACT;BECKENBACH, ULRICH;BECKENBACH, HELMUTH;REEL/FRAME:003948/0509

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Owner name: WARMESTELLE STEINE UND ERDEN GMBH, A GERMAN CORP.,

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