Patents Assigned to Maerz Ofenbau AG
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Publication number: 20230257302Abstract: A method for calcining and cooling material such as carbonate rocks may be employed in a parallel-flow regenerative shaft kiln that has two shafts, which are operated alternately as a calcining shaft and as a regenerative shaft. Material flows through a preheating zone, a calcining zone, and a cooling zone to a product outlet. At least one gas flow is compressed by a high-pressure fan and introduced into the parallel-flow regenerative shaft kiln. The high-pressure fan is configured as an axial fan or as a radial fan, having an impeller through which flow takes place axially or radially. A parallel-flow regenerative shaft kiln may also be utilized to perform such methods.Type: ApplicationFiled: July 7, 2021Publication date: August 17, 2023Applicants: Maerz Ofenbau AG, thyssenkrupp AG, thyssenkrupp Industrial Solutions AGInventor: Hannes PIRINGER
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Patent number: 11703280Abstract: A shaft furnace for firing carbonate-containing material may include, in a flow direction of the material, a preheating zone, a firing zone, a cooling zone, and a material outlet for discharging the material from the shaft furnace. Burner lances project into the firing zone. At least one burner lance has a first penetration depth into the firing zone and at least one further burner lance has a second penetration depth into the firing zone that is greater than the first penetration depth. A primary air conduit may be configured to convey combustion air and may be connected to at least one burner lance. An oxygen conduit for conveying oxygen into the firing zone may be arranged such that oxygen flows from the oxygen conduit at least one burner lance having the second penetration depth.Type: GrantFiled: March 4, 2020Date of Patent: July 18, 2023Assignees: MAERZ OFENBAU AG, THYSSENKRUPP AGInventors: Hannes Piringer, Patrick Bucher
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Publication number: 20230106711Abstract: A method can be used to burn and cool material in a parallel flow-counter flow regenerative shaft kiln having two shafts that are operated alternately as a burning shaft and a regenerative shaft. The material flows through a preheating zone, a burning zone, and a cooling zone to a material outlet. Fuel is supplied in or above the preheating zone, and thus fuel is heated in the preheating zone prior to entering the burning zone. Further, a parallel flow-counter flow regenerative shaft kiln for burning and cooling material may have two shafts that can be operated alternately as a burning shaft and a regenerative shaft. Each shaft has, in a flow direction, a preheating zone for preheating material, a burning zone for burning material, and a cooling zone for cooling material. A fuel inlet that admits fuel into each shaft is arranged above or inside the preheating zone.Type: ApplicationFiled: February 23, 2021Publication date: April 6, 2023Applicants: Maerz Ofenbau AG, thyssenkrupp AGInventors: Hannes PIRINGER, Patrick BUCHER, Fernand DIDELON
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Publication number: 20220170698Abstract: A shaft furnace for firing carbonate-containing material may include, in a flow direction of the material, a preheating zone, a firing zone, a cooling zone, and a material outlet for discharging the material from the shaft furnace. Burner lances project into the firing zone. At least one burner lance has a first penetration depth into the firing zone and at least one further burner lance has a second penetration depth into the firing zone that is greater than the first penetration depth. A primary air conduit may be configured to convey combustion air and may be connected to at least one burner lance. An oxygen conduit for conveying oxygen into the firing zone may be arranged such that oxygen flows from the oxygen conduit at least one burner lance having the second penetration depth.Type: ApplicationFiled: March 4, 2020Publication date: June 2, 2022Applicants: MAERZ OFENBAU AG, thyssenkrupp AGInventors: Hannes PIRINGER, Patrick BUCHER
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Patent number: 11034616Abstract: A method of operating a plant having a furnace including at least two vertical shafts connected by an overflow duct, wherein at least one burner is arranged above the overflow duct in each case such that the burner gases therefrom flow downward in burning operation of the respective shaft. A cooling gas supply is provided beneath the overflow duct in each case such that, in combination with the operation of a burner in the burner-operated shaft, the burner gas flowing downward is deflected in the direction of the overflow duct by the cooling gas ascending in the burner-operated shaft, and a supply of cooling gas is adjusted such that the temperature of the burner charge through which the burner gas flows at least in the burner-operated shaft is kept above the deacidification temperature thereof.Type: GrantFiled: March 3, 2017Date of Patent: June 15, 2021Assignees: MAERZ OFENBAU AG, THYSSENKRUPP AGInventors: Hannes Piringer, Patrick Bucher
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Patent number: 10947125Abstract: A furnace may include at least two vertical shafts, each of which may have at an upper end thereof an inlet for material to be burnt and at a lower end thereof a burnt material outlet. The inlet and the outlet may be connected by a transfer channel. In each case, at least one main burner may be positioned above the transfer channel, and a cooling gas inlet may be positioned below the transfer channel. At least one additional burner may be positioned below the transfer channel in each of the shafts. Such a furnace can be operated such that the material to be burnt in the currently fired shaft is at least partially calcined in a main burning zone above the transfer channel, and then thermally aftertreated in an additional burning zone positioned between the transfer channel and the additional burner.Type: GrantFiled: March 3, 2017Date of Patent: March 16, 2021Assignees: MAERZ OFENBAU AG, thyssenkrupp AGInventors: Hannes Piringer, Patrick Bucher
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Publication number: 20190345037Abstract: A furnace may include at least two vertical shafts, each of which may have at an upper end thereof an inlet for material to be burnt and at a lower end thereof a burnt material outlet. The inlet and the outlet may be connected by a transfer channel. In each case, at least one main burner may be positioned above the transfer channel, and a cooling gas inlet may be positioned below the transfer channel. At least one additional burner may be positioned below the transfer channel in each of the shafts. Such a furnace can be operated such that the material to be burnt in the currently fired shaft is at least partially calcined in a main burning zone above the transfer channel, and then thermally aftertreated in an additional burning zone positioned between the transfer channel and the additional burner.Type: ApplicationFiled: March 3, 2017Publication date: November 14, 2019Applicants: MAERZ OFENBAU AG, thyssenkrupp AGInventors: Hannes PIRINGER, Patrick BUCHER
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Patent number: 10301219Abstract: Burning and cooling carbonate rock in cocurrent regenerative lime kilns may involve alternately operating two shafts such that a first shaft operates as a burning shaft and a second shaft operates as a regenerative shaft during a first period and such that the first shaft operates as the regenerative shaft and the second shaft operates as the burning shaft during a second period. Carbonate rock introduced to upper regions of the shafts may be preheated and calcined. The carbonate rock may then be cooled in lower regions of the shafts before being discharged through discharge devices. The cooling of the carbonate rock may comprise introducing cooling air into the shafts partially through central displacement bodies in the shafts and partially through the discharge devices. Amounts of air entering through the central displacement bodies compared to the discharge devices may vary widely from the burning shaft to the regenerative shaft.Type: GrantFiled: July 28, 2014Date of Patent: May 28, 2019Assignee: MAERZ OFENBAU AGInventor: Hannes Piringer
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Publication number: 20190077705Abstract: A method of operating a plant having a furnace including at least two vertical shafts connected by an overflow duct, wherein at least one burner is arranged above the overflow duct in each case such that the burner gases therefrom flow downward in burning operation of the respective shaft. A cooling gas supply is provided beneath the overflow duct in each case such that, in combination with the operation of a burner in the burner-operated shaft, the burner gas flowing downward is deflected in the direction of the overflow duct by the cooling gas ascending in the burner-operated shaft, and a supply of cooling gas is adjusted such that the temperature of the burner charge through which the burner gas flows at least in the burner-operated shaft is kept above the deacidification temperature thereof.Type: ApplicationFiled: March 3, 2017Publication date: March 14, 2019Applicants: MAERZ OFENBAU AG, thyssenkrupp AGInventors: Hannes PIRINGER, Patrick BUCHER
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Patent number: 9919965Abstract: A method for burning lumpy stock is performed in at least one shaft which comprises a preheating zone, a burning zone and a cooling zone. Coal with a swelling index >1 is supplied together with a transport medium via burner lances which have burner tips. The coal together with the transport medium emerges into the shaft, wherein the temperature of the coal in the burner lances is kept below a temperature value at which melt phases of the coal that is used are formed. Here, for the transportation of the coal, use is made of a transport medium which, in the shaft, in the region directly adjacent to the burner tip, forms an oxygen-depleted atmosphere in order to delay the ignition of the coal after it emerges from the burner lance.Type: GrantFiled: September 9, 2013Date of Patent: March 20, 2018Assignee: Maerz Ofenbau AGInventors: Hannes Piringer, Patrick Bucher
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Publication number: 20160176760Abstract: Burning and cooling carbonate rock in cocurrent regenerative lime kilns may involve alternately operating two shafts such that a first shaft operates as a burning shaft and a second shaft operates as a regenerative shaft during a first period and such that the first shaft operates as the regenerative shaft and the second shaft operates as the burning shaft during a second period. Carbonate rock introduced to upper regions of the shafts may be preheated and calcined. The carbonate rock may then be cooled in lower regions of the shafts before being discharged through discharge devices. The cooling of the carbonate rock may comprise introducing cooling air into the shafts partially through central displacement bodies in the shafts and partially through the discharge devices. Amounts of air entering through the central displacement bodies compared to the discharge devices may vary widely from the burning shaft to the regenerative shaft.Type: ApplicationFiled: July 28, 2014Publication date: June 23, 2016Applicant: MAERZ OFENBAU AGInventor: Hannes PIRINGER
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Patent number: 9266774Abstract: According to the invention, the method for burning fragmented material is carried out in at least one shaft which comprises a preheating zone, a combustion zone and a cooling zone, coal having a swelling index > 1 being supplied via combustion lances, and the temperature of the coal in the combustion lances being maintained below a temperature value at which melting phases of the coal used are formed.Type: GrantFiled: May 9, 2012Date of Patent: February 23, 2016Assignee: Maerz Ofenbau AGInventors: Hannes Piringer, Patrick Bucher
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Patent number: 9011143Abstract: The method according to the invention for operating a PFR lime kiln having at least two shafts, which each have a preheating zone, a combustion zone and a cooling zone, and an overflow channel which connects the two shafts, substantially comprises the following method steps: the two shafts are operated alternately as a combustion shaft and exhaust gas shaft, combustion air and fuel are supplied to the combustion shaft, a corresponding flame length being formed, and the hot gases which are produced in the combustion shaft reach the exhaust gas shaft via the overflow channel, at least one parameter of the hot gases which is characteristic of the formation of the flame length being established by means of direct or indirect measurement in the region of the overflow channel and the ratio of fuel to combustion air being adjusted in accordance with this parameter in order to adjust a predetermined flame length.Type: GrantFiled: September 15, 2010Date of Patent: April 21, 2015Assignee: Maerz Ofenbau AGInventor: Hannes Piringer
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Publication number: 20140112848Abstract: According to the invention, the method for burning fragmented material is carried out in at least one shaft which comprises a preheating zone, a combustion zone and a cooling zone, coal having a swelling index>1 being supplied via combustion lances, and the temperature of the coal in the combustion lances being maintained below a temperature value at which melting phases of the coal used are formed.Type: ApplicationFiled: May 9, 2012Publication date: April 24, 2014Applicant: MAERZ OFENBAU AGInventors: Hannes Piringer, Patrick Bucher
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Patent number: 7833012Abstract: The invention relates to a process and an apparatus for calcining solids or sludges in a multiple-deck furnace having a firing region, which has at least one upper heated hearth and at least one lower heated hearth, and having a cooling region, which is provided with one or more unheated hearths, material to be calcined passing first into the firing region and then into the cooling region. A portion of the material to be calcined is delivered to the at least one lower heated hearth and/or to the cooling region, bypassing the at least one upper heated hearth of the firing region.Type: GrantFiled: November 2, 2007Date of Patent: November 16, 2010Assignees: Polysius AG, Maerz Ofenbau AGInventors: Christoph Beyer, Walter Egger
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Patent number: 7544321Abstract: A process container comprising a metallic casing having at least one refractory cladding layer disposed on the inner side thereof, and cooling elements connected to the outer side of the casing. Each cooling element comprises a base plate and at least one cooling channel connected to the base plate in a heat-conducting manner. The base plate is connected to the outer side of the casing by being screw connected to threaded bolts welded onto the outer side of the casing whereby the base plates nestle against the casing by flexural deformation due to clamping pressure of the screw connections. Ends of the cooling channels are connected to ends of adjacent cooling channels.Type: GrantFiled: May 27, 2004Date of Patent: June 9, 2009Assignees: Maerz-Ofenbau AG, Berzelius Stolberg GmbHInventors: Andreas Loebner, Reinhard PĆ¼llenberg
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Patent number: 7384263Abstract: A method for burning lumps of material, in particular limestone, is carried out in a regeneration shaft kiln (3) with at least two kiln shafts (1, 2) interconnected by an overflow line (19) and in which the material to be burned passes through an upper pre-heating zone (8), a central combustion zone (18) and a lower cooling zone (14). Combustion gas with a low calorific value of less than 7.5 megajoules (MJ) per m3 is periodically and alternately supplied to each of the shafts (1, 2) through burner lances (9, 25) after being pre-heated by heat exchange with process gas of the combustion process. The combustion gas is pre-heated in a heat exchanger (21) and/or by means of a surface of the burner lances (9, 25) which extend through the pre-heating zone (8), said surface being enlarged to enhance heat exchange.Type: GrantFiled: March 22, 2004Date of Patent: June 10, 2008Assignee: Maerz-Ofenbau AGInventor: Hannes Piringer
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Patent number: 6461154Abstract: In a method for burning carbonate-containing material the latter moves as a result of gravity in counter-current to the cooling and combustion air through a shaft kiln. The fuel supply takes place by means of burning lances introduced into the granular burning material at right angles to the shaft wall. On limiting the grain size and the residence time as a result of this type of fuel supply it is possible to achieve high burning temperatures even suitable for hard burning without there being any sintering together of the granular burning material.Type: GrantFiled: April 6, 2001Date of Patent: October 8, 2002Assignee: Maerz Ofenbau AGInventors: Hannes Piringer, Walter Egger
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Publication number: 20010029005Abstract: In a method for burning carbonate-containing material the latter moves as a result of gravity in counter-current to the cooling and combustion air through a shaft kiln. The fuel supply takes place by means of burning lances introduced into the granular burning material at right angles to the shaft wall. On limiting the grain size and the residence time as a result of this type of fuel supply it is possible to achieve high burning temperatures even suitable for hard burning without there being any sintering together of the granular burning material.Type: ApplicationFiled: April 6, 2001Publication date: October 11, 2001Applicant: MAERZ OFENBAU AGInventors: Hannes Piringer, Walter Egger
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Patent number: 5460517Abstract: The kiln operating according to the parallel-flow-regenerative process has two shafts (2, 3), which at the transition from the burning zone (14) to the cooling zone (15) have a widening forming an inner step (38) at which the combustion gases are transferred to the adjacent shaft (2, 3). This widened shaft area continues at least approximately cylindrically up to the bottom opening ( 35 ) of the shafts ( 2, 3 ) closed by a discharge device ( 34 ). This design of the shaft areas makes it possible, preferably together with an improved fuel distribution and charging device and in the case of satisfactory product quality, to burn limestone having particles in the size range 10 to 30 mm, which could hitherto not be burned in shaft kilns.Type: GrantFiled: February 25, 1993Date of Patent: October 24, 1995Assignee: Maerz-Ofenbau AGInventors: Karl Scheibenreif, Jiri Pacak