EP2510283A2 - Burner unit for steel making facilities - Google Patents

Burner unit for steel making facilities

Info

Publication number
EP2510283A2
EP2510283A2 EP10787770A EP10787770A EP2510283A2 EP 2510283 A2 EP2510283 A2 EP 2510283A2 EP 10787770 A EP10787770 A EP 10787770A EP 10787770 A EP10787770 A EP 10787770A EP 2510283 A2 EP2510283 A2 EP 2510283A2
Authority
EP
European Patent Office
Prior art keywords
feed channels
burner unit
burner
fuel
air
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
EP10787770A
Other languages
German (de)
French (fr)
Other versions
EP2510283B1 (en
Inventor
Johannes Münzer
Friedrich Eschmann
Ralf Allmannsdörfer
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.)
Paul Wurth Deutschland GmbH
Paul Wurth SA
Original Assignee
Paul Wurth Refractory and Engineering GmbH
Paul Wurth SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Paul Wurth Refractory and Engineering GmbH, Paul Wurth SA filed Critical Paul Wurth Refractory and Engineering GmbH
Priority to EP10787770.6A priority Critical patent/EP2510283B1/en
Publication of EP2510283A2 publication Critical patent/EP2510283A2/en
Application granted granted Critical
Publication of EP2510283B1 publication Critical patent/EP2510283B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/20—Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone
    • F23D14/22—Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone with separate air and gas feed ducts, e.g. with ducts running parallel or crossing each other
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C2900/00—Special features of, or arrangements for combustion apparatus using fluid fuels or solid fuels suspended in air; Combustion processes therefor
    • F23C2900/03005—Burners with an internal combustion chamber, e.g. for obtaining an increased heat release, a high speed jet flame or being used for starting the combustion

Definitions

  • the present invention relates to a burner unit for steel making facilities. More particularly, the present invention relates to an external burner unit of a regenerative or recuperative heat generator.
  • the regenerative heat generator may e.g. be a hot blast stove of a blast furnace.
  • Such stoves generally comprise a combustion chamber and a heat-retention shaft.
  • the combustion chamber and the heat- retention shaft are separated from one another by a wall constructed from refractory bricks.
  • a burner unit is generally located in a bottom section of the combustion chamber.
  • Combustion air and combustible fuel generally combustible gases, are supplied to the burner unit and a mixture of the combustion air and fuel is burned in the combustion chamber of the stove.
  • the flue gases emanating from the combustion rise upwards in the combustion chamber, are diverted via a dome and then pass through the heat-retention shaft filled with checker bricks. Heat from the flue gases is absorbed by the checker bricks.
  • the flue gasses which have now cooled down escape the stove via an exhaust gas chamber and at least one discharge port.
  • the supply of combustion air and fuel is discontinued and air is blown through the stove in the opposite direction.
  • the air is heated as it passes through the heat- retention shaft containing the hot checker bricks, diverted via a dome into the combustion chamber, where it leaves the stove via a hot blast outlet in the shell of the stove to be fed to the blast furnace.
  • the burner unit comprises a ceramic burner arranged within the stove, i.e. in the bottom section of its combustion chamber. It is also possible to provide external burner units, which are installed outside the shell of the stove. One or more such external burner units may be used instead of an internal ceramic burner. Alternatively, such external burner units may be used as additional heaters if used in conjunction with an internal ceramic burner.
  • the object of the present invention is to provide an improved burner unit for steel making facilities, in particular in connection with regenerative or recuperative heat generators. This object is achieved by a burner unit as claimed in claim 1 .
  • the present invention proposes a burner unit for steel making facilities, in particular for use in connection with a regenerative or recuperative heat generator, wherein the burner unit comprises a mixing zone, a plurality of fuel feed channels for feeding combustible fuel to the mixing zone; and a plurality of air feed channels for feeding combustion air to the mixing zone.
  • the burner unit comprises a primary burner with an annular feed arrangement comprising circumferentially alternating fuel feed channels and air feed channels; a central channel through the annular feed arrangement and a secondary burner arranged in the central channel of the burner unit, the central channel being coaxial with the annular feed arrangement.
  • the primary burner may be considered as main burner, dimensioned to generally work like a conventional burner.
  • the secondary burner may be considered as auxiliary burner for carrying out additional tasks, such as e.g. heating up the burner unit before the primary burner is switched on or aiding the combustion of the primary burner.
  • the secondary burner can be used as post combustion burner for using up any excess combustible fuel or combustion air from the primary burner, thereby altering the composition of the flue gasses exiting the burner unit.
  • the secondary burner can be used as post combustion burner for using up any excess combustible fuel or combustion air from the primary burner, thereby altering the composition of the flue gasses exiting the burner unit.
  • only one type of combustible fuel and one type of combustion air can be used at any one time, regulation of the flue gases composition may be difficult.
  • a mixing of different types of combustible fuel or combustion air may be carried out before feeding it to the burner unit.
  • the present invention allows, through the use of the secondary burner, to mix different types of combustible fuel or combustion air within the burner unit; i.e. two different types of combustible fuel or combustion air may be fed to the mixing zone, thereby altering the burning conditions and the flue gas temperature and/or composition.
  • the burner unit according to the present invention is therefore much more flexible, where operation modes are concerned, than conventional burner units.
  • the burner unit may also be used to directly supply fumes of a particular composition to the steel making facility to which it is connected.
  • air feed channels may also be referred to as oxygen feed channels. Indeed, instead of combustion air, oxygen O2 may be fed through the air feed channels to the mixing zone.
  • the burner unit further comprises auxiliary feed channels for feeding combustible fuel or combustion air to the mixing zone, the auxiliary feed channels having a cross-section smaller than a cross-section of the fuel feed channels or air feed channels.
  • the auxiliary feed channels comprise auxiliary fuel feed channels for feeding combustible fuel to the mixing zone, the auxiliary fuel feed channels having a cross-section smaller than a cross-section of the fuel feed channels of the primary burner.
  • the auxiliary feed channels may also further comprise auxiliary air feed channels for feeding combustion air to the mixing zone, the auxiliary air feed channels having a cross-section smaller than a cross-section of the air feed channels of the primary burner.
  • Both the auxiliary fuel feed channels and the auxiliary air feed channels are thus preferably low flow rate channels whereas the fuel feed channels and the air feed channels are preferably high flow rate channels.
  • the auxiliary feed channels allow feeding additional combustible fuel and/or combustion air to the mixing zone, thereby altering the combustion conditions of the primary burner.
  • the additional combustible fuel or combustion air may be of the same type than that fed through the main fuel and air feed channels, thereby adjusting the burning combustion conditions of the primary burner.
  • the additional combustible fuel or combustion air is of a different type than that fed through the main fuel and air feed channels, thereby also altering the composition of the flue gasses.
  • the additional combustible fuel or combustion air may also provide the primary burner with a non-stoichiometric mixture, whereby the primary burner only achieves a partial combustion of the mixture. The secondary burner may then be used to complete the combustion of the mixture.
  • the auxiliary feed channels thus contribute to the flexibility of the burner unit.
  • the combustible fuel fed through the fuel feed channels may be blast furnace gas and/or the combustion air fed through the air feed channels may be air or low calorific gas.
  • the combustible fuel fed through the auxiliary fuel feed channels may be high calorific gas, such as natural gas or coke oven gas and/or the combustion air fed through the auxiliary air feed channels may be oxygen.
  • the secondary burner preferably comprises air and fuel feed lines, thereby allowing the secondary burner to be used independently from the primary burner. It should be noted however that it is not excluded to provide the secondary burner with only one of the air and fuel feed lines. Indeed, the secondary burner may be used as post combustion burner, receiving air or fuel from the flue gasses from the primary burner.
  • the secondary burner may be of any appropriate type, depending on the fuel to be used. Such fuel may be chosen from the non-exhaustive list comprising oil, coke oven gas, blast furnace gas or natural gas.
  • the auxiliary fuel feed channels and/or the auxiliary air feed channels pass through a circumferential wall of the burner unit.
  • Annular feed chambers may be arranged around an exterior wall of the burner unit, the annular feed chambers being arranged for feeding combustible fuel or combustion air to the auxiliary fuel feed channels and the auxiliary air feed channels.
  • the auxiliary fuel feed channels and/or the auxiliary air feed channels pass through a rear wall of the burner unit, the auxiliary fuel feed channels and/or the auxiliary air feed channels being arranged parallel to the axis of the burner unit.
  • the auxiliary fuel feed channels and/or the auxiliary air feed channels may be arranged between the annular feed arrangement of the primary burner and the secondary burner.
  • the auxiliary fuel feed channels and/or the auxiliary air feed channels may be arranged within the annular feed arrangement of the primary burner.
  • the annular feed arrangement is preferably formed by an annular channel comprising a plurality of inner channels therein, the inner channels dividing the annular channel into the circumferentially alternating fuel feed channels and air feed channels, wherein the annular channel is connected for conveying one of the combustible fuel or the combustion air and the inner channels are used for conveying the other one of the combustible fuel or the combustion air.
  • the air feed channels and fuel feed channels are preferably parallel to the central axis if the burner unit. Other configurations should however not be excluded.
  • the air and fuel feed channels may e.g. be twisted around the central axis, which may provide a swirling of the combustible fuel and the combustion air when entering the mixing zone. Although generally not desired, in some instances such a swirl may be advantageous. It should be noted that other means for achieving a swirl may also be used.
  • the burner unit may also be used in connection with other steel making facilities, such as e.g. pulverised coal injection (PCI) installations or direct recuperative heat exchangers.
  • PCI pulverised coal injection
  • Fig .1 is a cut through a burner unit according to a first embodiment of the present invention
  • Fig.2 is a partial section view across the burner unit along line A-A of Fig .1 ;
  • Fig.3 is a cut through a burner unit according to a second embodiment of the present invention.
  • Fig.4 is a partial section view across the burner unit along line B-B of Fig.3.
  • Fig.1 shows a cut through a burner unit 10 according to a first embodiment of the present invention.
  • the burner unit 10 comprises a front section 12 with a combustion chamber 14 and a rear section 16 with feed lines for feeding combustible fuel and combustion air to a mixing zone 18 of the combustion chamber 14.
  • the front section 12 comprises an opening 20 for feeding flue gases from the burner unit 10 to a steel making facility such as e.g. a hot blast stove (not shown).
  • the burner unit 10 is connected to the hot blast stove via a connection flange 22.
  • refractory material 24 is applied against the inner surface 26 of the circumferential wall 28 to protect the latter from the heat generated in the combustion chamber 14.
  • the rear section 16 which comprises the feed lines, is more easily described by referring to both Fig.1 and Fig.2, the latter being a partial section view along line A-A of Fig .1 .
  • the rear section 16 comprises an annular feed arrangement 30 alternately comprising fuel feed channels 32 and air feed channels 34.
  • the fuel and air feed channels 32, 34 are arranged circumferentially, in alternating manner, preferably in regular sectors.
  • the fuel feed channels 32 and air feed channels 34 respectively lead combustible fuel and combustion air from a fuel inlet 36 and an air inlet 38 to the mixing zone 18 of the combustion chamber 14. In the mixing zone 18 the combustible fuel and combustion air meet and the mixture thereof is ignited to form a first combustion, represented by flames 40.
  • the annular feed arrangement 30 with its fuel and air feed channels 32, 34 forms a primary burner 42 of the burner unit 10.
  • the annular feed arrangement 30 surrounds a central channel 44, which is configured so as to receive a secondary burner 46 therein.
  • the annular feed arrangement 30 and central channel 44 are coaxial with a central axis 47 of the burner unit 10.
  • the central channel 44 is lined with refractory material 48.
  • the secondary burner 46 feeds combustible fuel and combustion air to the mixing zone 18, where a mixture thereof ignites to form a second combustion, represented by flame 50.
  • the secondary burner 46 is inserted into the burner unit 10 though a socket 52 in a rear wall 54 of the burner unit 10.
  • the construction of the annular feed arrangement 30 of the primary burner 42 can be more closely described by referring to Fig.2.
  • the annular feed arrangement 30 is formed by two coaxial pipes - an outer pipe 56 and an inner pipe 58 - between which an annular channel 60 is formed.
  • a plurality of inner channels 61 are formed by inserting pipe-like elements 62 connected to the inner pipe 58.
  • the pipe-like elements 62 form a gas tight separation wall between the inner channels 61 and the annular channel 60, thereby forming the fuel feed channels 32 and air feed channels 34.
  • Auxiliary fuel feed channels 64 and auxiliary air feed channels 66 may be provided for feeding further combustible fuel and further combustion air to the mixing zone 18.
  • Fig.1 shows both the auxiliary fuel feed channels 64 and the auxiliary air feed channels 66, it should be noted that it is also possible to provide the burner unit 10 with only one of these auxiliary feed channels 64, 66.
  • the auxiliary fuel feed channels 64 are arranged so as to feed further combustible fuel from an annular fuel feed chamber 68 connected to a fuel inlet 70 through the circumferential wall 28 of the burner unit 10 into the mixing zone 18.
  • the auxiliary air feed channels 66 are arranged so as to feed further combustion air from an annular air feed chamber 72 connected to an air inlet 74 through the circumferential wall 28 of the burner unit 10 into the mixing zone 18.
  • the auxiliary fuel and air feed channels 64, 66 are low flow rate channels arranged so as to deliver high calorific gas, such as natural gas or coke oven gas or oxygen to the mixing zone 18, thereby altering the combustion conditions of the primary burner 42.
  • the further fuel and/or air fed to the mixing zone 18 may be in quantities such that the mixture in the mixing zone 18 is non- stoichiometric, thereby only achieving a partial combustion with the primary burner 42. Further combustion of the flue gases from the first combustion may then be achieved with the aid of the secondary burner 46.
  • Figs 3 and 4 show a burner unit 10 according to a second embodiment of the invention, wherein Fig.4 is a partial section view along line B-B of Fig.3.
  • This burner unit is very similar to the one shown in Figs 1 and 2 and will therefore not be described herein in detail. Same reference numerals refer to identical features in both embodiments.
  • the burner unit of Fig. 2 and 3 differs from the first embodiment in the location of the auxiliary feed channels.
  • An auxiliary air feed channel 76 is arranged between the fuel feed channels 32 and air feed channels 34 of the annular feed arrangement 30 and the refractory material 48 of the central channel 44. At one end, the auxiliary air feed channel 76 is connected to an air inlet 78 arranged in the rear wall 54 of the burner unit 10; at the opposite end, the auxiliary air feed channel 76 comprises a port 80 opening into the mixing zone 18 of the burner unit 10.
  • Fig.2 shows an auxiliary air feed channel 76 only, it should be noted that it is also possible to provide the burner unit 10 with an auxiliary fuel feed channel in a similar manner.
  • combustible fuel and combustion air are generally fed through the fuel feed channels 32 and air feed channels 34, so as to form a combustible mixture in the mixing zone 18.
  • the flue gases from the combustion of this combustible mixture by the primary burner 42 is then fed through the opening 20 into the hot blast stove.
  • the auxiliary fuel and air feed channels 64, 66 allow the introduction of additional combustible fuel and combustion air into the mixing zone 18, thereby creating a combustible mixture potentially comprising two distinctive types of combustible fuel and two distinctive types of combustion air.
  • the flue gas composition can therefore be altered without having to resort to a potentially dangerous mixture upstream of the burner unit 10.
  • the secondary burner not only allows burning any excess component in the flue gases from the primary burner, it also allows heating up the burner unit and any downstream equipment before the primary burner is switched on.
  • the expressions "high flow rate” and “low flow rate” of the fuel and air feed channels and auxiliary fuel and air feed channels are relative to each other.
  • the flow rate or section size of the feed channels will strongly depend on the combustion media used.
  • the high flow rate, fuel and air feed channels 32, 34 may have a section in the region of 1500 cm 2 ; and the low flow rate, auxiliary fuel and air feed channels 64, 66 may have a section in the region of 200 cm 2 .
  • Table 1 A non-exhaustive list of examples for operation modes of the burner unit according to the present invention is shown in Table 1 .
  • connection flange 61 inner channels
  • annular feed arrangement 68 annular fuel feed chamber

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion Of Fluid Fuel (AREA)
  • Gas Burners (AREA)
  • Pre-Mixing And Non-Premixing Gas Burner (AREA)
  • Air Supply (AREA)

Abstract

The present invention proposes a burner unit (10) for steel making facilities, in particular for use in connection with a regenerative or recuperative heat generator, wherein the burner unit (10) comprises a mixing zone (18); a plurality of fuel feed channels (32) for feeding combustible fuel to the mixing zone (18); and a plurality of air feed channels (34) for feeding combustion air to the mixing zone (18). According to an important aspect of the invention, the burner unit (10) comprises a primary burner (42) with an annular feed arrangement (30) comprising circumferentially alternating fuel feed channels (32) and air feed channels (34); a central channel (44) through the annular feed arrangement (30) and a secondary burner (46) arranged in the central channel (44) of the burner unit (10), the central channel (44) being coaxial with the annular feed arrangement (30).

Description

Burner unit for steel making facilities
Introduction
The present invention relates to a burner unit for steel making facilities. More particularly, the present invention relates to an external burner unit of a regenerative or recuperative heat generator. The regenerative heat generator may e.g. be a hot blast stove of a blast furnace.
The preheating of air for blast furnaces is conventionally carried out in adjacent regenerative heat generators known as hot blast stoves. Such stoves generally comprise a combustion chamber and a heat-retention shaft. In case of an internal combustion chamber stove, the combustion chamber and the heat- retention shaft are separated from one another by a wall constructed from refractory bricks. A burner unit is generally located in a bottom section of the combustion chamber. Combustion air and combustible fuel, generally combustible gases, are supplied to the burner unit and a mixture of the combustion air and fuel is burned in the combustion chamber of the stove. The flue gases emanating from the combustion rise upwards in the combustion chamber, are diverted via a dome and then pass through the heat-retention shaft filled with checker bricks. Heat from the flue gases is absorbed by the checker bricks. The flue gasses which have now cooled down escape the stove via an exhaust gas chamber and at least one discharge port.
Once the checker bricks have been heated to a sufficient temperature, the supply of combustion air and fuel is discontinued and air is blown through the stove in the opposite direction. The air is heated as it passes through the heat- retention shaft containing the hot checker bricks, diverted via a dome into the combustion chamber, where it leaves the stove via a hot blast outlet in the shell of the stove to be fed to the blast furnace.
Generally, the burner unit comprises a ceramic burner arranged within the stove, i.e. in the bottom section of its combustion chamber. It is also possible to provide external burner units, which are installed outside the shell of the stove. One or more such external burner units may be used instead of an internal ceramic burner. Alternatively, such external burner units may be used as additional heaters if used in conjunction with an internal ceramic burner.
One advantage of such external burner units is that they are easily accessible, i.e. for maintenance or regulation purposes. Indeed, it may be advantageous to regulate the burner unit in order to achieve different temperatures or different flue gas compositions. This is of particular interest if the stove is used for experimental purposes.
Object of the invention
Consequently, the object of the present invention is to provide an improved burner unit for steel making facilities, in particular in connection with regenerative or recuperative heat generators. This object is achieved by a burner unit as claimed in claim 1 .
General description of the invention
In order to achieve this object, the present invention proposes a burner unit for steel making facilities, in particular for use in connection with a regenerative or recuperative heat generator, wherein the burner unit comprises a mixing zone, a plurality of fuel feed channels for feeding combustible fuel to the mixing zone; and a plurality of air feed channels for feeding combustion air to the mixing zone. The burner unit comprises a primary burner with an annular feed arrangement comprising circumferentially alternating fuel feed channels and air feed channels; a central channel through the annular feed arrangement and a secondary burner arranged in the central channel of the burner unit, the central channel being coaxial with the annular feed arrangement.
The primary burner may be considered as main burner, dimensioned to generally work like a conventional burner. The secondary burner may be considered as auxiliary burner for carrying out additional tasks, such as e.g. heating up the burner unit before the primary burner is switched on or aiding the combustion of the primary burner. Indeed, the secondary burner can be used as post combustion burner for using up any excess combustible fuel or combustion air from the primary burner, thereby altering the composition of the flue gasses exiting the burner unit. Whereas, in conventional burner units, only one type of combustible fuel and one type of combustion air can be used at any one time, regulation of the flue gases composition may be difficult. A mixing of different types of combustible fuel or combustion air may be carried out before feeding it to the burner unit. This is however generally cumbersome and sometimes dangerous. The present invention allows, through the use of the secondary burner, to mix different types of combustible fuel or combustion air within the burner unit; i.e. two different types of combustible fuel or combustion air may be fed to the mixing zone, thereby altering the burning conditions and the flue gas temperature and/or composition. The burner unit according to the present invention is therefore much more flexible, where operation modes are concerned, than conventional burner units.
The burner unit may also be used to directly supply fumes of a particular composition to the steel making facility to which it is connected.
It should be noted that the air feed channels may also be referred to as oxygen feed channels. Indeed, instead of combustion air, oxygen O2 may be fed through the air feed channels to the mixing zone.
According to an important aspect of the invention, the burner unit further comprises auxiliary feed channels for feeding combustible fuel or combustion air to the mixing zone, the auxiliary feed channels having a cross-section smaller than a cross-section of the fuel feed channels or air feed channels.
Advantageously, the auxiliary feed channels comprise auxiliary fuel feed channels for feeding combustible fuel to the mixing zone, the auxiliary fuel feed channels having a cross-section smaller than a cross-section of the fuel feed channels of the primary burner. Similarly, the auxiliary feed channels may also further comprise auxiliary air feed channels for feeding combustion air to the mixing zone, the auxiliary air feed channels having a cross-section smaller than a cross-section of the air feed channels of the primary burner. Both the auxiliary fuel feed channels and the auxiliary air feed channels are thus preferably low flow rate channels whereas the fuel feed channels and the air feed channels are preferably high flow rate channels.
The auxiliary feed channels allow feeding additional combustible fuel and/or combustion air to the mixing zone, thereby altering the combustion conditions of the primary burner.
The additional combustible fuel or combustion air may be of the same type than that fed through the main fuel and air feed channels, thereby adjusting the burning combustion conditions of the primary burner. Preferably however, the additional combustible fuel or combustion air is of a different type than that fed through the main fuel and air feed channels, thereby also altering the composition of the flue gasses. The additional combustible fuel or combustion air may also provide the primary burner with a non-stoichiometric mixture, whereby the primary burner only achieves a partial combustion of the mixture. The secondary burner may then be used to complete the combustion of the mixture.
The auxiliary feed channels thus contribute to the flexibility of the burner unit.
The combustible fuel fed through the fuel feed channels may be blast furnace gas and/or the combustion air fed through the air feed channels may be air or low calorific gas.
The combustible fuel fed through the auxiliary fuel feed channels may be high calorific gas, such as natural gas or coke oven gas and/or the combustion air fed through the auxiliary air feed channels may be oxygen.
The secondary burner preferably comprises air and fuel feed lines, thereby allowing the secondary burner to be used independently from the primary burner. It should be noted however that it is not excluded to provide the secondary burner with only one of the air and fuel feed lines. Indeed, the secondary burner may be used as post combustion burner, receiving air or fuel from the flue gasses from the primary burner. The secondary burner may be of any appropriate type, depending on the fuel to be used. Such fuel may be chosen from the non-exhaustive list comprising oil, coke oven gas, blast furnace gas or natural gas.
According to one embodiment of the invention, the auxiliary fuel feed channels and/or the auxiliary air feed channels pass through a circumferential wall of the burner unit. Annular feed chambers may be arranged around an exterior wall of the burner unit, the annular feed chambers being arranged for feeding combustible fuel or combustion air to the auxiliary fuel feed channels and the auxiliary air feed channels.
According to another embodiment of the invention, the auxiliary fuel feed channels and/or the auxiliary air feed channels pass through a rear wall of the burner unit, the auxiliary fuel feed channels and/or the auxiliary air feed channels being arranged parallel to the axis of the burner unit. The auxiliary fuel feed channels and/or the auxiliary air feed channels may be arranged between the annular feed arrangement of the primary burner and the secondary burner. Alternatively, the auxiliary fuel feed channels and/or the auxiliary air feed channels may be arranged within the annular feed arrangement of the primary burner.
The annular feed arrangement is preferably formed by an annular channel comprising a plurality of inner channels therein, the inner channels dividing the annular channel into the circumferentially alternating fuel feed channels and air feed channels, wherein the annular channel is connected for conveying one of the combustible fuel or the combustion air and the inner channels are used for conveying the other one of the combustible fuel or the combustion air. By providing inner channels arranged in the annular channel, a gastight separation can be formed between the fuel feed channels and the air feed channels, thereby avoiding any leaks from one channel to the other within the annular feed arrangement.
The air feed channels and fuel feed channels are preferably parallel to the central axis if the burner unit. Other configurations should however not be excluded. The air and fuel feed channels may e.g. be twisted around the central axis, which may provide a swirling of the combustible fuel and the combustion air when entering the mixing zone. Although generally not desired, in some instances such a swirl may be advantageous. It should be noted that other means for achieving a swirl may also be used.
It should be noted that, although the present application mainly describes a burner unit in connection with a hot blast stove, the burner unit may also be used in connection with other steel making facilities, such as e.g. pulverised coal injection (PCI) installations or direct recuperative heat exchangers.
Brief description of the figures
The present invention will be more apparent from the following description of a not limiting embodiment with reference to the attached drawings. In these drawings, wherein identical reference numerals are used to indicate identical or similar elements,
Fig .1 : is a cut through a burner unit according to a first embodiment of the present invention;
Fig.2: is a partial section view across the burner unit along line A-A of Fig .1 ;
Fig.3: is a cut through a burner unit according to a second embodiment of the present invention; and
Fig.4: is a partial section view across the burner unit along line B-B of Fig.3.
Detailed description with respect to the figures
Fig.1 shows a cut through a burner unit 10 according to a first embodiment of the present invention. The burner unit 10 comprises a front section 12 with a combustion chamber 14 and a rear section 16 with feed lines for feeding combustible fuel and combustion air to a mixing zone 18 of the combustion chamber 14. The front section 12 comprises an opening 20 for feeding flue gases from the burner unit 10 to a steel making facility such as e.g. a hot blast stove (not shown). The burner unit 10 is connected to the hot blast stove via a connection flange 22. In the front section 12, refractory material 24 is applied against the inner surface 26 of the circumferential wall 28 to protect the latter from the heat generated in the combustion chamber 14.
The rear section 16, which comprises the feed lines, is more easily described by referring to both Fig.1 and Fig.2, the latter being a partial section view along line A-A of Fig .1 . The rear section 16 comprises an annular feed arrangement 30 alternately comprising fuel feed channels 32 and air feed channels 34. The fuel and air feed channels 32, 34 are arranged circumferentially, in alternating manner, preferably in regular sectors. The fuel feed channels 32 and air feed channels 34 respectively lead combustible fuel and combustion air from a fuel inlet 36 and an air inlet 38 to the mixing zone 18 of the combustion chamber 14. In the mixing zone 18 the combustible fuel and combustion air meet and the mixture thereof is ignited to form a first combustion, represented by flames 40. The annular feed arrangement 30 with its fuel and air feed channels 32, 34 forms a primary burner 42 of the burner unit 10.
The annular feed arrangement 30 surrounds a central channel 44, which is configured so as to receive a secondary burner 46 therein. The annular feed arrangement 30 and central channel 44 are coaxial with a central axis 47 of the burner unit 10. The central channel 44 is lined with refractory material 48. The secondary burner 46 feeds combustible fuel and combustion air to the mixing zone 18, where a mixture thereof ignites to form a second combustion, represented by flame 50. The secondary burner 46 is inserted into the burner unit 10 though a socket 52 in a rear wall 54 of the burner unit 10.
The construction of the annular feed arrangement 30 of the primary burner 42 can be more closely described by referring to Fig.2. The annular feed arrangement 30 is formed by two coaxial pipes - an outer pipe 56 and an inner pipe 58 - between which an annular channel 60 is formed. Within the annular channel 60, a plurality of inner channels 61 are formed by inserting pipe-like elements 62 connected to the inner pipe 58. The pipe-like elements 62 form a gas tight separation wall between the inner channels 61 and the annular channel 60, thereby forming the fuel feed channels 32 and air feed channels 34. Auxiliary fuel feed channels 64 and auxiliary air feed channels 66 may be provided for feeding further combustible fuel and further combustion air to the mixing zone 18. Although, Fig.1 shows both the auxiliary fuel feed channels 64 and the auxiliary air feed channels 66, it should be noted that it is also possible to provide the burner unit 10 with only one of these auxiliary feed channels 64, 66.
The auxiliary fuel feed channels 64 are arranged so as to feed further combustible fuel from an annular fuel feed chamber 68 connected to a fuel inlet 70 through the circumferential wall 28 of the burner unit 10 into the mixing zone 18. Similarly, the auxiliary air feed channels 66 are arranged so as to feed further combustion air from an annular air feed chamber 72 connected to an air inlet 74 through the circumferential wall 28 of the burner unit 10 into the mixing zone 18.
The auxiliary fuel and air feed channels 64, 66 are low flow rate channels arranged so as to deliver high calorific gas, such as natural gas or coke oven gas or oxygen to the mixing zone 18, thereby altering the combustion conditions of the primary burner 42. The further fuel and/or air fed to the mixing zone 18 may be in quantities such that the mixture in the mixing zone 18 is non- stoichiometric, thereby only achieving a partial combustion with the primary burner 42. Further combustion of the flue gases from the first combustion may then be achieved with the aid of the secondary burner 46.
Figs 3 and 4 show a burner unit 10 according to a second embodiment of the invention, wherein Fig.4 is a partial section view along line B-B of Fig.3. This burner unit is very similar to the one shown in Figs 1 and 2 and will therefore not be described herein in detail. Same reference numerals refer to identical features in both embodiments. The burner unit of Fig. 2 and 3 differs from the first embodiment in the location of the auxiliary feed channels.
An auxiliary air feed channel 76 is arranged between the fuel feed channels 32 and air feed channels 34 of the annular feed arrangement 30 and the refractory material 48 of the central channel 44. At one end, the auxiliary air feed channel 76 is connected to an air inlet 78 arranged in the rear wall 54 of the burner unit 10; at the opposite end, the auxiliary air feed channel 76 comprises a port 80 opening into the mixing zone 18 of the burner unit 10.
Although Fig.2 shows an auxiliary air feed channel 76 only, it should be noted that it is also possible to provide the burner unit 10 with an auxiliary fuel feed channel in a similar manner.
During typical operation of the burner unit 10, combustible fuel and combustion air are generally fed through the fuel feed channels 32 and air feed channels 34, so as to form a combustible mixture in the mixing zone 18. The flue gases from the combustion of this combustible mixture by the primary burner 42 is then fed through the opening 20 into the hot blast stove.
The auxiliary fuel and air feed channels 64, 66 allow the introduction of additional combustible fuel and combustion air into the mixing zone 18, thereby creating a combustible mixture potentially comprising two distinctive types of combustible fuel and two distinctive types of combustion air. The flue gas composition can therefore be altered without having to resort to a potentially dangerous mixture upstream of the burner unit 10.
The secondary burner not only allows burning any excess component in the flue gases from the primary burner, it also allows heating up the burner unit and any downstream equipment before the primary burner is switched on.
To adjust the temperature, flow rated or composition of the flue gases fed to the hot blast stove, numerous combinations of burners and combustion media are available due to the innovative design of the present burner unit.
It should be noted that, in the context of the present invention, the expressions "high flow rate" and "low flow rate" of the fuel and air feed channels and auxiliary fuel and air feed channels are relative to each other. The flow rate or section size of the feed channels will strongly depend on the combustion media used. Purely for the purpose of providing an example, the high flow rate, fuel and air feed channels 32, 34 may have a section in the region of 1500 cm2; and the low flow rate, auxiliary fuel and air feed channels 64, 66 may have a section in the region of 200 cm2. A non-exhaustive list of examples for operation modes of the burner unit according to the present invention is shown in Table 1 .
Table 1 Reference signs
10 burner unit 50 flame
12 front section 52 socket
14 combustion chamber 54 rear wall
16 rear section 56 outer pipe
18 mixing zone 58 inner pipe
20 opening 60 annular channel
22 connection flange 61 inner channels
24 refractory material 62 pipe-like elements
26 inner surface 64 auxiliary fuel feed channels
28 circumferential wall 66 auxiliary air feed channels
30 annular feed arrangement 68 annular fuel feed chamber
32 fuel feed channels 70 fuel inlet
34 air feed channels 72 annular air feed chamber
36 fuel inlet 74 air inlet
38 air inlet 76 auxiliary air feed channel
40 flames 78 air inlet
42 primary burner 80 port
44 central channel
46 secondary burner

Claims

Claims
Burner unit for steel making facilities, in particular for use in connection with a regenerative or recuperative heat generator, wherein the burner unit comprises:
a mixing zone;
a plurality of fuel feed channels for feeding combustible fuel to said mixing zone; and
a plurality of air feed channels for feeding combustion air to said mixing zone
a primary burner with an annular feed arrangement comprising circumferentially alternating fuel feed channels and air feed channels;
a central channel through said annular feed arrangement, said central channel being coaxial with said annular feed arrangement; and
a secondary burner arranged in said central channel of said burner unit. characterised by
auxiliary feed channels for feeding combustible fuel or combustion air to said mixing zone, said auxiliary feed channels having a cross-section smaller than a cross-section of said fuel feed channels or said air feed channels.
Burner unit according to claim 1 , wherein said auxiliary feed channels comprise auxiliary fuel feed channels for feeding combustible fuel to said mixing zone, said auxiliary fuel feed channels having a cross-section smaller than a cross-section of said fuel feed channels of said primary burner.
Burner unit according to claim 1 or 2, wherein said auxiliary feed channels comprise auxiliary air feed channels for feeding combustion air to said mixing zone, said auxiliary air feed channels having a cross-section smaller than a cross-section of said air feed channels of said primary burner.
4. Burner unit according to any one of claims 1 to 3, wherein said auxiliary feed channels pass through a circumferential wall of said burner unit.
5. Burner unit according to claim 4, wherein annular feed chambers are arranged around an exterior wall of said burner unit, said annular feed chambers being arranged for feeding fuel or air to said auxiliary feed channels.
6. Burner unit according to any one of claims 1 to 3, wherein said auxiliary feed channels pass through a rear wall of said burner unit, said auxiliary feed channels being arranged parallel to the axis of said burner unit.
7. Burner unit according to claim 6, wherein said auxiliary feed channels are arranged between said annular feed arrangement of said primary burner and said secondary burner.
8. Burner unit according to claim 6, wherein said auxiliary feed channels are arranged within said annular feed arrangement of said primary burner.
9. Burner unit according to any one of the previous claims, wherein
said combustible fuel is blast furnace gas, and/or
said combustion air is air or low calorific gas.
10. Burner unit according to claims 2 and 3, wherein
said combustible fuel fed through said auxiliary fuel feed channels is high calorific gas, such as natural gas or coke oven gas, and/or
said combustion air fed through said auxiliary air feed channels is oxygen.
1 1 . Burner unit according to any one of the preceding claims, wherein said secondary burner comprises air and fuel feed lines.
12. Burner unit according to any one of the preceding claims, wherein said annular feed arrangement is formed by an annular channel comprising a plurality of inner channels therein, said inner channels dividing said annular channel into said circumferentially alternating fuel feed channels and air feed channels, said annular channel being connected for conveying one of said combustible fuel or said combustion air, said inner channels being used for conveying the other one of said combustible fuel or said combustion air.
Burner unit according to any one of the preceding claims, wherein said air feed channels and fuel feed channels are parallel to the central axis of said burner unit.
EP10787770.6A 2009-12-08 2010-12-08 Burner unit for steel making facilities Active EP2510283B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP10787770.6A EP2510283B1 (en) 2009-12-08 2010-12-08 Burner unit for steel making facilities

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP09178385A EP2333412A1 (en) 2009-12-08 2009-12-08 Burner unit for steel making facilities
PCT/EP2010/069177 WO2011070070A2 (en) 2009-12-08 2010-12-08 Burner unit for steel making facilities
EP10787770.6A EP2510283B1 (en) 2009-12-08 2010-12-08 Burner unit for steel making facilities

Publications (2)

Publication Number Publication Date
EP2510283A2 true EP2510283A2 (en) 2012-10-17
EP2510283B1 EP2510283B1 (en) 2013-07-03

Family

ID=41563196

Family Applications (2)

Application Number Title Priority Date Filing Date
EP09178385A Withdrawn EP2333412A1 (en) 2009-12-08 2009-12-08 Burner unit for steel making facilities
EP10787770.6A Active EP2510283B1 (en) 2009-12-08 2010-12-08 Burner unit for steel making facilities

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP09178385A Withdrawn EP2333412A1 (en) 2009-12-08 2009-12-08 Burner unit for steel making facilities

Country Status (11)

Country Link
EP (2) EP2333412A1 (en)
JP (1) JP5636435B2 (en)
KR (1) KR101732396B1 (en)
CN (1) CN102713436B (en)
AU (1) AU2010329886B2 (en)
BR (1) BR112012013643B1 (en)
CA (1) CA2782763A1 (en)
DE (1) DE09178385T1 (en)
IN (1) IN2012DN04997A (en)
RU (1) RU2533269C2 (en)
WO (1) WO2011070070A2 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102408919A (en) * 2011-10-11 2012-04-11 北京航天动力研究所 Combustion nozzle combination device of multi-channel coal water slurry gasification furnace
CN103044036B (en) * 2013-01-07 2014-09-24 中钢集团洛阳耐火材料研究院有限公司 Sintering method of self-combination silicon-carbide refractories
JP6073270B2 (en) * 2014-09-18 2017-02-01 ボルカノ株式会社 Combustion device, boiler, and combustion method
JP6054349B2 (en) * 2014-09-03 2016-12-27 ボルカノ株式会社 Combustion device, boiler, and combustion method
US10520221B2 (en) 2015-04-06 2019-12-31 Carrier Corporation Refractory for heating system
CN110291352B (en) * 2017-02-13 2023-11-17 布卢姆工程公司 Dual-mode electric storage burner system and method of heating a furnace using a dual-mode electric storage burner system
WO2018195789A1 (en) * 2017-04-26 2018-11-01 Linde Aktiengesellschaft Method and burner for heating a furnace for metal processing

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2942655A (en) * 1955-04-27 1960-06-28 Fisher Scientific Co Gas burner
GB957110A (en) * 1961-11-22 1964-05-06 British Oxygen Co Ltd Process and jet for the treatment of metal
DE2215347C2 (en) * 1972-03-29 1982-06-16 Krupp-Koppers Gmbh, 4300 Essen Ceramic burner for blast furnace wind heaters
SU964348A1 (en) * 1981-01-05 1982-10-07 Всесоюзный Научно-Исследовательский И Проектный Институт Вторичной Цветной Металлургии Burner
US4403947A (en) * 1981-08-12 1983-09-13 Eclipse, Inc. Gas mixing burner
SU1467322A1 (en) * 1987-03-23 1989-03-23 Предприятие П/Я Р-6603 Burner device
US5454712A (en) * 1993-09-15 1995-10-03 The Boc Group, Inc. Air-oxy-fuel burner method and apparatus
US5714113A (en) * 1994-08-29 1998-02-03 American Combustion, Inc. Apparatus for electric steelmaking
KR100659678B1 (en) * 1999-08-17 2006-12-21 닛폰화네스코교 가부시기가이샤 Combustion method and burner
JP4068041B2 (en) * 2002-10-22 2008-03-26 日本碍子株式会社 Low NOx burner
JP2005226850A (en) * 2004-02-10 2005-08-25 Ebara Corp Combustion device
FR2892498B1 (en) * 2005-10-21 2007-12-28 Lafarge Sa BURNER FOR OVEN AT CLINKER
US7810333B2 (en) * 2006-10-02 2010-10-12 General Electric Company Method and apparatus for operating a turbine engine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2011070070A2 *

Also Published As

Publication number Publication date
KR101732396B1 (en) 2017-05-24
AU2010329886B2 (en) 2014-09-18
AU2010329886A1 (en) 2012-06-21
EP2510283B1 (en) 2013-07-03
CA2782763A1 (en) 2011-06-16
EP2333412A1 (en) 2011-06-15
RU2533269C2 (en) 2014-11-20
JP2013513084A (en) 2013-04-18
BR112012013643A2 (en) 2020-08-25
RU2012128355A (en) 2014-01-20
DE09178385T1 (en) 2011-12-01
IN2012DN04997A (en) 2015-10-02
KR20120101531A (en) 2012-09-13
WO2011070070A2 (en) 2011-06-16
JP5636435B2 (en) 2014-12-03
BR112012013643B1 (en) 2021-08-17
CN102713436A (en) 2012-10-03
WO2011070070A3 (en) 2011-08-11
CN102713436B (en) 2014-11-12

Similar Documents

Publication Publication Date Title
AU2010329886B2 (en) Burner unit for steel making facilities
CN105378381B (en) Central burner for many spray gun burner systems of multi fuel
US9574770B2 (en) Start-up torch
EP3173696A1 (en) Top combustion stove
US4156590A (en) Combustion in a melting furnace
GB2259978A (en) Burner for, and method of, burning low calorific gas
US8517725B2 (en) Ceramic burner
WO2018201259A1 (en) Plasma heating blast air
WO2009047260A3 (en) Burner for an industrial furnace
KR100761211B1 (en) A partial combustion burner for preheating oxygen
RU2766115C2 (en) Burner for combusting gaseous fuel in a shaft furnace, primarily for heat treatment of minerals in the granular form
CN216384169U (en) Pilot burner and hot-blast stove suitable for burning gas containing dust and tar
RU2317499C2 (en) Mode and a burner for rotating furnaces
RU32862U1 (en) Gas-burner
AU2014325697B2 (en) Burner and coal upgrading plant
CN120947192A (en) A vertical oxygen-controlled low-nitrogen pulverized coal hot blast stove
CS245387B1 (en) Equipment for the combustion of carbon monoxide from melting furnaces
TW201508225A (en) Method for operating a multi-gas burner and a multi-gas burner

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20120530

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

DAX Request for extension of the european patent (deleted)
GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

INTG Intention to grant announced

Effective date: 20130326

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

Ref country code: AT

Ref legal event code: REF

Ref document number: 620002

Country of ref document: AT

Kind code of ref document: T

Effective date: 20130715

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 602010008306

Country of ref document: DE

Effective date: 20130829

REG Reference to a national code

Ref country code: NL

Ref legal event code: T3

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130703

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG4D

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20131103

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130703

Ref country code: NO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20131003

Ref country code: BE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130703

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130703

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130703

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20131104

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130918

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130703

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130703

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130703

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20131004

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20131014

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130703

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130703

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130703

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130703

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130703

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130703

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130703

26N No opposition filed

Effective date: 20140404

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 602010008306

Country of ref document: DE

Effective date: 20140404

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20131208

REG Reference to a national code

Ref country code: IE

Ref legal event code: MM4A

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20131208

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130703

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SM

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130703

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130703

Ref country code: RS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20131003

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130703

Ref country code: HU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO

Effective date: 20101208

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130703

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 6

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20141231

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20141231

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: TR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130703

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 7

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 8

REG Reference to a national code

Ref country code: DE

Ref legal event code: R082

Ref document number: 602010008306

Country of ref document: DE

Representative=s name: OFFICE FREYLINGER S.A., LU

Ref country code: DE

Ref legal event code: R081

Ref document number: 602010008306

Country of ref document: DE

Owner name: PAUL WURTH S.A., LU

Free format text: FORMER OWNERS: PAUL WURTH REFRACTORY & ENGINEERING GMBH, 55252 MAINZ-KASTEL, DE; PAUL WURTH S.A., LUXEMBURG/LUXEMBOURG, LU

Ref country code: DE

Ref legal event code: R081

Ref document number: 602010008306

Country of ref document: DE

Owner name: PAUL WURTH DEUTSCHLAND GMBH, DE

Free format text: FORMER OWNERS: PAUL WURTH REFRACTORY & ENGINEERING GMBH, 55252 MAINZ-KASTEL, DE; PAUL WURTH S.A., LUXEMBURG/LUXEMBOURG, LU

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 9

REG Reference to a national code

Ref country code: GB

Ref legal event code: 732E

Free format text: REGISTERED BETWEEN 20180927 AND 20181005

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130703

REG Reference to a national code

Ref country code: NL

Ref legal event code: HC

Owner name: PAUL WURTH S.A.; LU

Free format text: DETAILS ASSIGNMENT: CHANGE OF OWNER(S), CHANGE OF OWNER(S) NAME; FORMER OWNER NAME: PAUL WURTH UMWELTTECHNIK GMBH

Effective date: 20181018

Ref country code: NL

Ref legal event code: PD

Owner name: PAUL WURTH UMWELTTECHNIK GMBH; DE

Free format text: DETAILS ASSIGNMENT: CHANGE OF OWNER(S), MERGE; FORMER OWNER NAME: PAUL WURTH S.A.

Effective date: 20181018

REG Reference to a national code

Ref country code: AT

Ref legal event code: PC

Ref document number: 620002

Country of ref document: AT

Kind code of ref document: T

Owner name: PAUL WURTH DEUTSCHLAND GMBH, DE

Effective date: 20191115

Ref country code: AT

Ref legal event code: PC

Ref document number: 620002

Country of ref document: AT

Kind code of ref document: T

Owner name: PAUL WURTH S.A., LU

Effective date: 20191115

REG Reference to a national code

Ref country code: DE

Ref legal event code: R081

Ref document number: 602010008306

Country of ref document: DE

Owner name: PAUL WURTH S.A., LU

Free format text: FORMER OWNERS: PAUL WURTH DEUTSCHLAND GMBH, 45131 ESSEN, DE; PAUL WURTH S.A., LUXEMBURG/LUXEMBOURG, LU

Ref country code: DE

Ref legal event code: R081

Ref document number: 602010008306

Country of ref document: DE

Owner name: PAUL WURTH DEUTSCHLAND GMBH, DE

Free format text: FORMER OWNERS: PAUL WURTH DEUTSCHLAND GMBH, 45131 ESSEN, DE; PAUL WURTH S.A., LUXEMBURG/LUXEMBOURG, LU

P01 Opt-out of the competence of the unified patent court (upc) registered

Effective date: 20230524

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 20241118

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20241115

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20241115

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20241115

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 20241118

Year of fee payment: 15