WO2007021239A1 - Method and arrangement for monitoring a burner. - Google Patents

Method and arrangement for monitoring a burner. Download PDF

Info

Publication number
WO2007021239A1
WO2007021239A1 PCT/SE2006/050278 SE2006050278W WO2007021239A1 WO 2007021239 A1 WO2007021239 A1 WO 2007021239A1 SE 2006050278 W SE2006050278 W SE 2006050278W WO 2007021239 A1 WO2007021239 A1 WO 2007021239A1
Authority
WO
Grant status
Application
Patent type
Prior art keywords
channel
oxidant
fuel
burner
supplied
Prior art date
Application number
PCT/SE2006/050278
Other languages
French (fr)
Inventor
Tomas Ekman
Lennart Rangmark
Original Assignee
Aga Ab
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

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23DBURNERS
    • F23D14/00Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/20Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone
    • F23D14/22Non-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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23CMETHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C9/00Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
    • F23C9/006Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber the recirculation taking place in the combustion chamber
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23DBURNERS
    • F23D14/00Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/32Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid using a mixture of gaseous fuel and pure oxygen or oxygen-enriched air
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23NREGULATING OR CONTROLLING COMBUSTION
    • F23N2029/00Flame sensors
    • F23N2029/04Flame sensors sensitive to the colour of flames

Abstract

A method during the combustion of a fuel with an oxidant in an industrial furnace, in which the fuel and the oxidant are supplied to a burner head and where the flame is monitored by means of a detector for ultraviolet light. The invention is characterised in that at least one channel (3) for the supply of fuel and at least two channels (4, 5) for the supply of oxidant are present and open out into the surface (6) of the burner head (1) that faces into the furnace, in that the channel (3) for fuel and a first channel (5) for oxidant are located at a distance from each other, in that the channel (3) for fuel and the second channel (4) for oxidant are located more closely to each other, in that the said detector (2) is arranged at the channel (3) for fuel or at the second channel (4) for oxidant, and in that a fraction of the total amount of oxidant supplied is caused to be supplied to the said second channel (4) for oxidant, and in that oxidant is supplied to the said second channel during the complete combustion process. The invention relates also to a burner.

Description

Method and Arrangement for Monitoring a Burner

The present invention relates to a method and an arrangement for monitoring a burner, principally burners used in indus- trial furnaces .

One way of solving the problem of the formation of NOx during the combustion of fossil fuels is to inject gases at a high rate of flow into the combustion zone. Gaseous fuel and a gaseous oxidant are injected at a distance from each other into the combustion zone. The gases are injected through lances that are provided with nozzles into a burner head. The injected gases will be diluted with combustion gases since the gases are injected at a distance from each other. This dilution, together with the fact that the diluted gases are first mixed at a certain distance away from the burner head, means that the gases react with each other in a combustion process that proceeds at a lower rate than that of conventional combustion due to a lower concentration of gases. This combustion ensures that the formation of NOx is suppressed.

For reasons of safety, a burner must be monitored for the presence of a flame during operation. Such monitoring usually takes place through a UV-sensor, which is sensitive to ultra- violet radiation. The sensor is normally mounted in the burner such that the UV-sensor sees a part of a flame that is present .

The flame will become longer and more spread out through the method of combustion described above, and thus less visible. This makes the detection of a flame by means of the sensor considerably more difficult. Furthermore, the method of combustion described above requires that the furnace is first heated to the spontaneous ignition temperature of the gases before combustion by the method described above can be commenced. The furnace is in this case operated at a temperature that lies under approximately 8000C. A burner of the type specified above cannot for reasons of safety be used during the heating phase since a flame of the type described is difficult to detect at a temperature under 8000C, while safety regulations at the same time specify that UV- monitoring is to take place at temperatures that lie under 800°C.

The present invention solves this problem.

The present invention thus relates to a method during the combustion of a fuel with an oxidant in an industrial fur- nace, in which the fuel and the oxidant are supplied to a burner head and where the flame is monitored by means of a detector for ultraviolet light, and it is characterised in that at least one channel for the supply of fuel and at least two channels for the supply of oxidant are present and open out into the surface of the burner head that faces into the furnace, in that the channel for fuel and a first channel for oxidant are located at a distance from each other, in that the channel for fuel and the second channel for oxidant are located more closely to each other, in that the said detector is arranged at the channel for fuel or at the second channel for oxidant, and in that a fraction of the total amount of oxidant supplied is caused to be supplied to the said second channel for oxidant, and in that oxidant is supplied to the said second channel during the complete combustion process.

The invention furthermore relates to an arrangement of the type and having the principal characteristics that are specified in claim 6. The invention is described in more detail below, partially in association with an embodiment of the invention shown on the attached drawings, where

- Figure 1 shows schematically a longitudinal section of a burner head according to the invention, and

- Figures 2a, 2b and 2c show alternative embodiments of a central part of the burner head seen from the right in Figure 1.

Figure 1 shows a burner for the combustion of a fuel with an oxidant in an industrial furnace. The burner is arranged such that fuel and oxidant are supplied to the burner head 1. A detector 2 for the detection of ultraviolet light is present outside of the burner head 1 in order to monitor a flame.

According to the invention, at least one channel 3 is present for the supply of fuel and at least two channels 4, 5 for the supply of oxidant, opening out in the surface 6 of the burner head that faces the furnace. The channel 3 for fuel and a first channel for oxidant are located at a distance from each other, and the channel 3 for fuel and the second channel 4 for oxidant are located more closely to each other.

Figure 1 shows also a third channel 7 for the supply of oxidant.

The said detector 2 is arranged at the channel 3 for fuel or in the second channel 4 for oxidant. It is appropriate that the detector is arranged at the end of the channel that lies farthest away from the furnace and so arranged that UV-light from the flame that is led into the channel impinges upon the detector. The detector is connected to a detector circuit, not shown in the drawings, by means of which circuit the presence or otherwise of a flame can be assessed. In the case in which a flame is not detected, supply of fuel and oxidant is interrupted.

When fuel of low value, such as blast furnace gas, is used, it may be advantageous, in the case in which the said detector 2 is arranged at the channel 3 for fuel, to arrange the detector at a special pipe that runs within the channel 3 for fuel .

Furthermore, the burner is arranged to supply a fraction of the total amount of oxidant supplied to the said second channel 4 for oxidant.

The channel 3 for fuel and the second channel 4 for oxidant, which are located more closely to each other, have a distance between them such that a stable flame that begins close to the burner head can be maintained.

The channel 3 for fuel and the first channel 5 for oxidant are located at such a distance from each other that the gases injected are diluted with combustion gases. This dilution, together with the fact that the diluted gases are first mixed at a certain distance away from the burner head, means that the gases react with each other in a combustion process in which the formation of NOx is suppressed, as has been described above.

It is most advantageous to use oxidants with the present invention that have an 02~content that is greater than 85%. The fuel can be natural gas, propane, butane, gasol, heating oil, etc.

The oxidant is injected into the combustion space through one or several nozzles designed as straight pipes or through Laval nozzles or Venturi nozzles. A preferred pressure for the oxidant is an excess pressure of at least 2 bar. The greater this pressure, the greater will be the suppression of the formation of NOx that is achieved. A preferred pressure for normal applications is 4-5 bar. The fuel is injected through normal nozzles at the pressure that is available.

The distance between the channel 3 for fuel and the said first channel should exceed approximately 40 mm in order to achieve the desired effect.

When oxidant is supplied to the first channel 5, supply of oxidant to the second channel 4 for oxidant continues . A stable combustion process is in this way obtained also for fuel and the oxidant that is supplied through the first channel for oxidant.

As has been described above, the detector 2 is arranged in the channel 3 for fuel or in the second channel 4 for oxi- dant . Both of these channels open out close to each other in the side of the burner head that faces the furnace, and for this reason detection of a flame that arises from combustion with oxidant from the second channel 4 for oxidant will be extremely secure. Fuel and oxidant from the first channel 5 for oxidant will be combusted provided that this flame is present .

Thus, an extremely secure indication of combustion is obtained. This means that the present method and arrangement make possible the detection of the flame by a UV-detector under all conceivable operating conditions .

According to one preferred design, between 4 and 40% of the oxidant is caused to be supplied by the said second channel 4. This amount of oxidant gives a stable flame, while at the same time the fraction of oxidant is sufficiently small not to influence the formation of NOx.

According to a further preferred design, between 5 and 15% of the oxidant is caused to be supplied through the said second channel 4.

Figures 2a-2c show different designs of the channel for fuel and the said second channel, seen from the right in Figure 1.

According to one preferred design shown in Figure 2a and Figure 2b, the said second channel 4;4B and the channel 3;3B for fuel are coaxial .

According to an alternative design shown in Figure 2c, the said second channel 4C and the channel 3C for fuel are separated and parallel.

It is clear that the channels may be designed in another way and that there may be other quantities of these without deviating from the innovative concept.

Furthermore, it is clear that one skilled in the arts will have no difficulty in determining dimensions and positions for the channels such that the technical effects described above are obtained.

Thus, the present invention is not to be considered to be limited to the embodiments specified above: it can be varied within the framework specified by the attached patent claims.

Claims

Claims
1. A method during the combustion of a fuel with an oxidant in an industrial furnace, in which the fuel and the oxidant are supplied to a burner head and where the flame is monitored by means of a detector for ultraviolet light, characterised in that at least one channel (3) for the supply of fuel and at least two channels (4, 5) for the supply of oxidant are present and open out into the surface (6) of the burner head
(1) that faces into the furnace, in that the channel (3) for fuel and a first channel (5) for oxidant are located at a distance from each other, in that the channel (3) for fuel and the second channel (4) for oxidant are located more closely to each other, in that the said detector (2) is arranged at the channel (3) for fuel or at the second channel (4) for oxidant, and in that a fraction of the total amount of oxidant supplied is caused to be supplied to the said second channel (4) for oxidant, and in that oxidant is supplied to the said second channel during the complete combustion process.
2. The method according to claim 1, characterised in that between 4 and 40% of the oxidant is caused to be supplied to the said second channel (4) .
3. The method according to claim 1 or 2, characterised in that between 5 and 15% of the oxidant is caused to be supplied to the said second channel (4) .
4. The method according to claim 1, 2 or 3, characterised in that the said second channel (4) and the channel (3) for fuel are caused to be coaxial.
5. The method according to claim 1, 2 or 3, characterised in that the said second channel (4) and the channel (3) for fuel are caused to be separate and parallel.
6. A burner for the combustion of a fuel with an oxidant in an industrial furnace, in which the burner is arranged to supply fuel and oxidant to the burner head of the burner and where a detector for ultraviolet light is present in order to monitor a flame from the burner head, characterised in that at least one channel (3) for the supply of fuel and at least two channels (4, 5) for the supply of oxidant are present and open out into the surface (6) of the burner head (1) that faces into the furnace, in that the channel (3) for fuel and a first channel (5) for oxidant are located at a distance from each other, in that the channel (3) for fuel and the second channel (4) for oxidant are located more closely to each other, in that the said detector (2) is arranged at the channel (3) for fuel or at the second channel (4) for oxidant, and in that the burner is arranged to supply a fraction of the total amount of oxidant to the said second channel (4) for oxidant.
7. The arrangement according to claim 6, characterised in that the burner is arranged to supply between 4 and 40% of the oxidant to the said second channel (4) .
8. The arrangement according to claim 6, characterised in that the burner is arranged to supply between 5 and 15% of the oxidant to the said second channel (4) .
9. The arrangement according to claim 6, 7 or 8, characterised in that the said second channel (4) and the channel (3) for fuel are coaxial.
10. The arrangement according to claim 6, 7 or 8, characterised in that the said second channel (4) and the channel (3) for fuel are separate and parallel.
PCT/SE2006/050278 2005-08-19 2006-08-04 Method and arrangement for monitoring a burner. WO2007021239A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
SE0501840-3 2005-08-19
SE0501840 2005-08-19

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20060769657 EP1915573A1 (en) 2005-08-19 2006-08-04 Method and arrangement for monitoring a burner.

Publications (1)

Publication Number Publication Date
WO2007021239A1 true true WO2007021239A1 (en) 2007-02-22

Family

ID=37757826

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2006/050278 WO2007021239A1 (en) 2005-08-19 2006-08-04 Method and arrangement for monitoring a burner.

Country Status (3)

Country Link
US (1) US20070042302A1 (en)
EP (1) EP1915573A1 (en)
WO (1) WO2007021239A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2030953A1 (en) * 2007-08-30 2009-03-04 Linde Aktiengesellschaft Method and device for glass melting

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2297053B1 (en) * 2008-06-05 2014-01-01 AGC Glass Europe Glass melting furnace

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4378205A (en) * 1980-04-10 1983-03-29 Union Carbide Corporation Oxygen aspirator burner and process for firing a furnace
US4525138A (en) * 1983-10-28 1985-06-25 Union Carbide Corporation Flame signal enhancer for post-mixed burner
US4541798A (en) * 1983-11-07 1985-09-17 Union Carbide Corporation Post-mixed spark-ignited burner
US5503548A (en) * 1994-01-13 1996-04-02 Messer Griesheim Gmbh Method for reducing pollutant gas emissions in combustion and burner therefor
US6196831B1 (en) * 1998-09-02 2001-03-06 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Combustion process for burning a fuel

Family Cites Families (47)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3280882A (en) * 1964-04-06 1966-10-25 Babcock & Wilcox Co Flame detector arrangement
US3262486A (en) * 1964-08-07 1966-07-26 John J Rose Ultraviolet light responsive flame modulating control
US3689773A (en) * 1971-02-01 1972-09-05 Bailey Miters & Controls Ltd Flame monitor system and method using multiple radiation sensors
US3771944A (en) * 1972-08-30 1973-11-13 Bloom Eng Co Inc Adjustable flame burner
US4039844A (en) * 1975-03-20 1977-08-02 Electronics Corporation Of America Flame monitoring system
US4116611A (en) * 1976-09-01 1978-09-26 Consolidated Natural Gas Service Company Gaseous and liquid fuel burner
DE2729321C2 (en) * 1977-06-29 1983-10-20 Smit Ovens Nijmegen B.V., Nijmegen, Nl
US4630554A (en) * 1982-05-14 1986-12-23 T.A.S., Inc. Pulverized solid fuel burner and method of firing pulverized fuel
US4861262A (en) * 1984-08-17 1989-08-29 American Combustion, Inc. Method and apparatus for waste disposal
US4709155A (en) * 1984-11-22 1987-11-24 Babcock-Hitachi Kabushiki Kaisha Flame detector for use with a burner
US5073104A (en) * 1985-09-02 1991-12-17 The Broken Hill Proprietary Company Limited Flame detection
US4793798A (en) * 1986-08-08 1988-12-27 Sabin Darrel B Burner apparatus
DE3706234C2 (en) * 1987-02-26 1989-06-01 Ingenieur Bureau Sonvico Ag, Langnau, Ch
JPS63243628A (en) * 1987-03-31 1988-10-11 Toshiba Corp Flame sensing device
US4907961A (en) * 1988-05-05 1990-03-13 Union Carbide Corporation Oxygen jet burner and combustion method
US5123836A (en) * 1988-07-29 1992-06-23 Chiyoda Corporation Method for the combustion treatment of toxic gas-containing waste gas
ES2064538T3 (en) * 1990-06-29 1995-02-01 Wuenning Joachim Method and device for combustion of fuel in a combustion chamber.
US5100313A (en) * 1991-02-05 1992-03-31 Union Carbide Industrial Gases Technology Corporation Coherent jet combustion
US5073105A (en) * 1991-05-01 1991-12-17 Callidus Technologies Inc. Low NOx burner assemblies
DE59209576D1 (en) * 1991-08-27 1999-01-14 Sie Systems Spa Means for detecting the presence and the quality of a flame by detecting electromagnetic radiation
US5249954A (en) * 1992-07-07 1993-10-05 Electric Power Research Institute, Inc. Integrated imaging sensor/neural network controller for combustion systems
GB9321810D0 (en) * 1993-10-22 1993-12-15 Spectus Ltd Improvements to oil flame monitors
US5601425A (en) * 1994-06-13 1997-02-11 Praxair Technology, Inc. Staged combustion for reducing nitrogen oxides
US5601789A (en) * 1994-12-15 1997-02-11 W. R. Grace & Co.-Conn. Raw gas burner and process for burning oxygenic constituents in process gas
DE19501914C1 (en) * 1995-01-23 1996-04-04 Centrotherm Elektrische Anlage Installation for cleaning waste gases by incineration
US5763888A (en) * 1995-01-30 1998-06-09 Ametek Aerospace Products, Inc. High temperature gas stream optical flame sensor and method for fabricating same
US5772421A (en) * 1995-05-26 1998-06-30 Canadian Gas Research Institute Low nox burner
US5924858A (en) * 1995-06-13 1999-07-20 Praxair Technology, Inc. Staged combustion method
US5743723A (en) * 1995-09-15 1998-04-28 American Air Liquide, Inc. Oxy-fuel burner having coaxial fuel and oxidant outlets
US5931654A (en) * 1997-06-30 1999-08-03 Praxair Technology, Inc. Recessed furnace lance purge gas system
FR2771798B1 (en) * 1997-12-02 1999-12-31 Air Liquide Oxy-fuel burner
US6206686B1 (en) * 1998-05-01 2001-03-27 North American Manufacturing Company Integral low NOx injection burner
DE19858120A1 (en) * 1998-12-16 2000-06-21 Basf Ag A process for the thermal treatment of non-flammable liquids
US6472669B1 (en) * 1999-02-02 2002-10-29 Abb Research Ltd. Silicon carbide photodiode based flame scanner
GB9910708D0 (en) * 1999-05-07 1999-07-07 Spectral Flame Management Limi Flame detector units and flame management systems
DE60025933T2 (en) * 1999-11-02 2006-11-09 Ebara Corp. Combustion device for treatment of exhaust
FR2804497B1 (en) * 2000-02-01 2002-03-29 Air Liquide Burner aero-oxy-gas flame stabilized, and block quarl crew of such a burner
US6652266B1 (en) * 2000-05-26 2003-11-25 International Thermal Investments Ltd. Flame sensor and method of using same
US6948929B2 (en) * 2000-10-02 2005-09-27 Ebara Corporation Combustion type waste gas treatment system
US6702571B2 (en) * 2001-09-05 2004-03-09 Gas Technology Institute Flex-flame burner and self-optimizing combustion system
US6659762B2 (en) * 2001-09-17 2003-12-09 L'air Liquide - Societe Anonyme A' Directoire Et Conseil De Surveillance Pour L'etude Et L'exploitation Des Procedes Georges Claude Oxygen-fuel burner with adjustable flame characteristics
US6910878B2 (en) * 2003-06-19 2005-06-28 Praxair Technology, Inc. Oxy-fuel fired process heaters
US7074034B2 (en) * 2004-06-07 2006-07-11 Air Products And Chemicals, Inc. Burner and process for combustion of a gas capable of reacting to form solid products
EP1814677B9 (en) * 2004-10-29 2016-12-21 Aga Aktiebolag Method for the manufacture of extended steel products.
US20070040308A1 (en) * 2005-08-19 2007-02-22 Aga Ab Lance for use during combustion
US8057222B2 (en) * 2006-04-25 2011-11-15 Aga Ab Direct flame impingement burner
US8057221B2 (en) * 2006-06-22 2011-11-15 Aga Ab Method and burner for burning with oxygen

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4378205A (en) * 1980-04-10 1983-03-29 Union Carbide Corporation Oxygen aspirator burner and process for firing a furnace
US4525138A (en) * 1983-10-28 1985-06-25 Union Carbide Corporation Flame signal enhancer for post-mixed burner
US4541798A (en) * 1983-11-07 1985-09-17 Union Carbide Corporation Post-mixed spark-ignited burner
US5503548A (en) * 1994-01-13 1996-04-02 Messer Griesheim Gmbh Method for reducing pollutant gas emissions in combustion and burner therefor
US6196831B1 (en) * 1998-09-02 2001-03-06 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Combustion process for burning a fuel

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2030953A1 (en) * 2007-08-30 2009-03-04 Linde Aktiengesellschaft Method and device for glass melting

Also Published As

Publication number Publication date Type
US20070042302A1 (en) 2007-02-22 application
EP1915573A1 (en) 2008-04-30 application

Similar Documents

Publication Publication Date Title
US8316784B2 (en) Oxy/fuel combustion system with minimized flue gas recirculation
US5240404A (en) Ultra low NOx industrial burner
US5848887A (en) Low emission combustion system
US6139311A (en) Pilot burner apparatus and method for operating
US20090133379A1 (en) Active combustion control for a turbine engine
US5439373A (en) Luminous combustion system
US5806299A (en) Process and apparatus for quickly switching over from premix combustion to diffusion combustion in a gas turbine
US20060000395A1 (en) Staged combustion system with ignition-assisted fuel lances
US6736635B1 (en) Combustor for exhaust gas treatment
US5551869A (en) Gas staged burner
US6394792B1 (en) Low NoX burner apparatus
US20160025333A1 (en) Perforated flame holder and burner including a perforated flame holder
US5694869A (en) Reducing NOX emissions from a roof-fired furnace using separated parallel flow overfire air
US7704748B2 (en) Gas analyzer for measuring the flammability of mixtures of combustible gases and oxygen
US4368031A (en) Stationary flame scanner for tilting burner
JP2006002991A (en) Combustion device
US20090308331A1 (en) Oxygen control system for oxygen enhanced combustion of solid fuels
WO2006031163A1 (en) A method pertaining to combustion, and a burner
US7077069B2 (en) U-type slag-tap firing boiler and method of operating the boiler
US6129542A (en) Dual mode pilot burner
US20050274116A1 (en) Lean blowoff detection sensor
US7028642B2 (en) Water heater having raw fuel jet pilot and associated burner clogging detection apparatus
US20020041836A1 (en) Combustion type waste gas treatment system
US20060105281A1 (en) Water heater burner clogging detection and shutdown system
US20060234172A1 (en) Method for combusing fuel in a fired heater

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application
DPE1 Request for preliminary examination filed after expiration of 19th month from priority date (pct application filed from 20040101)
WWE Wipo information: entry into national phase

Ref document number: 2006769657

Country of ref document: EP

NENP Non-entry into the national phase in:

Ref country code: DE

ENP Entry into the national phase in:

Ref document number: PI0616554

Country of ref document: BR

Kind code of ref document: A2

Effective date: 20080218