WO1989002051A1 - A method to generate an oxidizing flame, a burner and a use for a burner - Google Patents

A method to generate an oxidizing flame, a burner and a use for a burner Download PDF

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Publication number
WO1989002051A1
WO1989002051A1 PCT/SE1987/000392 SE8700392W WO8902051A1 WO 1989002051 A1 WO1989002051 A1 WO 1989002051A1 SE 8700392 W SE8700392 W SE 8700392W WO 8902051 A1 WO8902051 A1 WO 8902051A1
Authority
WO
WIPO (PCT)
Prior art keywords
oxygen
nozzle
burner
central
fuel
Prior art date
Application number
PCT/SE1987/000392
Other languages
French (fr)
Inventor
Lars Saltin
Martin Petersson
Original Assignee
Aga Aktiebolag
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 Aga Aktiebolag filed Critical Aga Aktiebolag
Priority to PCT/SE1987/000392 priority Critical patent/WO1989002051A1/en
Priority to BR8707994A priority patent/BR8707994A/en
Priority to EP87906117A priority patent/EP0393020A1/en
Publication of WO1989002051A1 publication Critical patent/WO1989002051A1/en
Priority to NO90900985A priority patent/NO166671C/en
Priority to DK053990A priority patent/DK53990D0/en
Priority to FI901050A priority patent/FI901050A0/en

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/16—Tuyéres
    • 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
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/32—Burners 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

Definitions

  • the present invention relates to a method of generating a powerfully oxidizing flame and a burner therefore, the burner including a central body with a central oxygen nozzle and at least one fuel nozzle, a casing which surrounds the central body and which ⁇ ay form the inner wall ' of cooling jacket surrounding the burner, at least one peripheral oxygen nozzle between the central body and the casing and an oxygen chamber outside the central body.
  • the present invention also relates to the use of the burner as an oxygen lance.
  • burners which are supplied with a gaseous, liquid or solid fluidizable fuel and oxygenous gas. Particularly high temperatures are obtained when the oxygenous gas consists of pure oxygen. Burners which are driven with a fuel and an oxygenous gas with a high content of oxygen are normally designated oxy-fuel burners.
  • Oxy-fuel burners are employed in industrial processes in which high temperatures occur, for example in the melting of steel, in the manufacture of aluminium and lead and in cement manufacture. These burners are often employed in electric arc furnaces for, for example, steel melting as a complement to the electric energy so as to increase the output capacity of the furnace. In such instances, they are installed in the roof or side wall of the furnace. In the charging of an arc furnace in steel manufacture, the amount of scrap is often so great that it covers the oxy-fuel burners, in which event problems arise in respect of the space for tb flame of the burner for the combustion process, the efficiency of the burner being thereby reduced. Hence, there is an urgent need for rapidly creating a space in the scrap to allow for the combustion. OBJECTS OF THE PRESENT INVENTION
  • One object of• the present invention is to realize a method of creating, with an oxy-fuel burner, a powerfully oxidizing flame which rapidly creates the necessary space for the flame of the burner.
  • a further object of the present invention is to realize a burner by means which it is possible to create a powerfully oxidizing flame which, in a brief space of time, creates the space necessary for the action an effect of the burner.
  • a burner which includes a central oxygen nozzle, at least one fuel nozzle disposed radially outside the central oxygen nozzle, and at least peripheral oxygen nozzle in greater spaced apart relationship from the central oxygen nozzle than the fuel nozzle.
  • the primary characterizing feature of this burner is that the central oxygen nozzle is designed as a laval nozzle.
  • a further characterizing feature is that the central oxygen nozzle is supplied at a different oxygen pressure than the peripheral oxygen nozzle, separate conduits being connected to the oxygen nozzles.
  • the method according to the present invention is characterized in that the ' ratio between the amount of fuel through the fuel nozzle and the oxygen amount through the peripheral oxygen nozzle are regulated so as to obtain a substantially stoicio etric combustion; and that, for generating the powerfully oxidizing flame, oxygen is caused to flow at great speed through the central oxygen nozzle, the speed of flow of the oxygen through the .central oxygen nozzle being preferably higher than the speed of sound for oxygen.
  • Fig. 1 illustrates the oxy-fuel burner according to the present invention in section through its longitudinal axis
  • Fig. 2 illustrates another embodiment of the burner of Fig. 1;
  • Fig. 3 illustrates yet a further embodiment of the burner according to the present invention in section through the longitudinal axis of the burner.
  • the burner of Fig. 1 displays a casing 1 which defines a cylindrical oxygen chamber 21.
  • the rear region of the casing 1 is provided with a flange 19, in which a wall 15 defining the oxygen chamber 21 is sealingly mounted by, for example, a number of bolts (not shown).
  • An inlet 17 for oxygen is connected to the oxygen chamber 21.
  • the casing 1 serves as the inner wall of a cooling jacket 3 surrounding the burner.
  • the cooling jacket 3 is provided with an inlet 5 and an outlet 7 for coolant, which normally is water.
  • the burner further includes a centre body 9 in its forward region, the central body being held in spaced apart relationship from the casing 1 by spacers 11.
  • the forward end of the central body is retracted in relation to the forward end of the casing 1, but may, naturally, also be flush with or ahead of the forward end of the casing.
  • the space between the central body 9 and the casing 1 forms an annular gap which constitutes a first oxygen nozzle 13 through which oxygen may depart from the oxygen chamber 21.
  • a second nozzle 23 for oxygen is connected to a conduit 29 which passes through the rear wall 15 of the oxygen chamber 21.
  • the second oxygen nozzle 23 is designed as a laval nozzle.
  • the inlet 19 and the conduit 29 are each connected to their oxygen source, it being possible to obtain, in the conduit 29, a greater pressure than in the oxygen chamber 21.
  • a compartment 27 is disposed at the rear end of the centre body 9, the compartment surrounding the conduit 29 and being defined at its ' forward end by the centre body 9.
  • the nozzle 25, 26 connects the chamber 27 with the outside of the burner.
  • a conduit 31 is connected to the compartment 27, this conduit, like the. conduit 29, passing through the oxygen chamber 21 and departing from the burner through the rear defining wall 15.
  • the conduit 31 is connected to a source of fuel, preferably gaseous fuel.
  • the chamber 27 serves as a distribution chamber for the fuel to the fuel nozzle 25, 26.
  • the burner of Fig. 2 is similar to that of Fig. 1. Those parts and details of the burner according to Fig. 2 which are identical with corresponding parts and details in Fig. 1 have been given the same reference numeral.
  • the burner of Fig. 2 displays a casing 2 which defines a cylindrical oxygen chamber 22.
  • the rear region of the casing 2 is provided with a flange 19 in which a wall 15 defining the oxygen chamber 22 is ' -seal ingly mounted.
  • a seal may be disposed between the flange 19 and the wall 15.
  • An inlet 17 for oxygen is connected to the oxygen chamber 22.
  • the casing 2 lacks the cooling jacket.
  • the casing 2 may, for instance, consist of a ceramic material or an ultra-high-temperature alloy, such as a cemented carbide.
  • the forward bounding definition of the oxygen chamber is a central body 10 disposed in the forward end of the burner.
  • the inlet 17 and the conduit 29 are each connected to their source of oxygen, it being possible in the conduit 29 to achieve a greater pressure than- in the oxygen chamber.
  • the central body 10 sealingly abuts against the inside of the casing 2, and its forward edge is here flush with the forward edge of the casing 2.
  • an oxygen nozzle 23 which is designed as a laval nozzle and corresponds to the second nozzle of the burner according to Fig. 1.
  • the second oxygen nozzle 23 is, at its end facing away from the forward face of the burner, connected to the conduit 29 for oxygen.
  • a fuel distribution chamber 27 whose forward bounding definition is the central body 10.
  • the nozzle 25, 26 connects the fuel distribution chamber 27 with the outside of the burner.
  • the nozzle 25, 26 is a fuel nozzle.
  • a conduit 31 is connected to the chamber 27, this conduit, like the conduit 29 for oxygen, passing through the oxygen chamber 22 and departing therefrom through the rear defining wall 15 of the burner.
  • the conduit 31 is connected to a fuel source, preferably gaseous fuel.
  • the side wall of the fuel chamber is located in spaced apart relationship from the casing 2, such that the forward bounding definition of the oxygen chamber 22 consists of the central body 10.
  • the nozzle 14 may also consist of an annular nozzle 14 corresponding to the first oxygen nozzle 13 in Fig. 1.
  • the first oxygen nozzle 14 and the fuel nozzle 25, 26 consist of a number of nozzles 14 and 26, respectively, arranged concentrically in a ring, these may be cylindrical and straight or cylindrical and helical, in which latter case the helical portion is at most 90 degrees.
  • These nozzles may also be trunco-conical , the base of the truncated cone then facing forwards.
  • the first oxygen nozzles may also be designed as laval nozzles.
  • the burner according to Fig. 3 is very similar to the burner of Fig. 1.
  • the gap which constitutes the peripheral oxygen nozzle 13 in Fig. 1 has, in this figure, been replaced by a make-up piece 16 between the central body 9 and the casing 1.
  • the make-up piece 16 includes a number of nozzles 20 arranged in a ring, these likening the nozzles 14 of Fig. 2, but may also consist of an annular nozzle.
  • the forward edge of the make-up piece is displaced in relation to both the forward edge of the casing 1 and the forward edge of the central body 9. In the illustrated embodiment, the make-up piece 16 is shorter than the central body 9.
  • peripheral oxygen nozzles like the fuel nozzles, may be odd or even in number.
  • the first and second oxygen nozzle 13, 14; 20, 23, respectively
  • oxygen nozzles are designated oxygen nozzles. It is, naturally, possible to use gas mixtures with oxygen instead of pure oxygen. However, in such instance it is appropriate that the oxygen content be at least 50 per cent by volume.
  • coolant is supplied to the inlet 5 of the cooling jacket 3, this coolant departing from the jacket 3 through the outlet 7.
  • Oxygen is supplied through the inlet 17 to the oxygen chamber 21, this oxygen departing therefrom through the nozzle 13, and fuel, for example natural gas, is supplied through the conduit 31 where it is dissipated in the chamber 27 and departs therefrom through the nozzle 25, 26.
  • fuel for example natural gas
  • oxygen is supplied to the oxygen chamber 21 and fuel through the conduit 31 in such volumes and at such proportions that there will be obtained stoiciometric combustion with a suitable flame size.
  • the burner then functions as a conventional oxy-fuel burner.
  • the burner When the intention is to employ the burner to generate a powerfully oxidizing flame, the burner is ignited on the supply of oxygen to the nozzle 13 and fuel to the nozzle 25, 26. Thereafter, oxygen is supplied at high pressure to the conduit 29, this oxygen departing from the burner through the second oxygen nozzle 23 which is designed as a laval nozzle.
  • the second oxygen nozzle 23 which is designed as a laval nozzle.
  • the thus obtained powerfully oxidizing flame may be used for rapidly creating a.space about the burner in those cases when a charge supplied to a furnace covers the burner and prevents, or at least seriously obstructs the normal function of a conventional oxy-fuel burner.
  • the oxygen supply to the central nozzle 23 for oxygen is cut off.
  • the burner thereafter functions as a conventional oxy-fuel burner.
  • the ratio between the volume of oxygen supplied to the burner through the central nozzle 23 and the peripheral nozzle 13, 14 and 20 may vary within broad limits. In the generation of a powerfully oxidizing flame, the ratio is normally greater than 0.5, preferably greater than 1.
  • the burner will also be employed as a conventional oxygen lance. In such instance, only oxygen is supplied to the burner, preferably solely through the second oxygen nozzle 23 which is designed as- a laval nozzle, or also through the first oxygen nozzle 13 which is also preferably designed as a laval nozzle.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Pre-Mixing And Non-Premixing Gas Burner (AREA)
  • Gas Burners (AREA)
  • Control And Other Processes For Unpacking Of Materials (AREA)

Abstract

The disclosure relates to a method of generating a powerfully oxidizing flame, and a burner therefore, the burner including a central body (9) with a central oxygen nozzle (23) and at least one fuel nozzle (25, 26), a casing (1) surrounding the central body (9), at least one peripheral oxygen nozzle (13) radially outside the fuel nozzle (25, 26), and an oxygen chamber (21) outside the central body (9), all nozzles (23; 25, 26; 13) being at least substantially parallel. The central oxygen nozzle (23) and the peripheral oxygen nozzle (13) are connected to different sources of oxygen, it being possible for the source connected to the central oxygen nozzle (23) to deliver a higher pressure than the other source. Preferably, the central oxygen nozzle (23) is designed as a laval nozzle. When solely oxygen is supplied to the burner, it may be employed as an oxygen lance. Preferably, oxygen is then only supplied to the central oxygen nozzle (23).

Description

AMETHOD TO GENERATEAN OXIDIZING FLAME, ABURNERAND A USE FORABURNER.
TECHNICAL FIELD
The present invention relates to a method of generating a powerfully oxidizing flame and a burner therefore, the burner including a central body with a central oxygen nozzle and at least one fuel nozzle, a casing which surrounds the central body and which ^ay form the inner wall' of cooling jacket surrounding the burner, at least one peripheral oxygen nozzle between the central body and the casing and an oxygen chamber outside the central body. The present invention also relates to the use of the burner as an oxygen lance. BACKGROUND ART
For generating flames of high temperature, use is made of burners which are supplied with a gaseous, liquid or solid fluidizable fuel and oxygenous gas. Particularly high temperatures are obtained when the oxygenous gas consists of pure oxygen. Burners which are driven with a fuel and an oxygenous gas with a high content of oxygen are normally designated oxy-fuel burners.
Oxy-fuel burners are employed in industrial processes in which high temperatures occur, for example in the melting of steel, in the manufacture of aluminium and lead and in cement manufacture. These burners are often employed in electric arc furnaces for, for example, steel melting as a complement to the electric energy so as to increase the output capacity of the furnace. In such instances, they are installed in the roof or side wall of the furnace. In the charging of an arc furnace in steel manufacture, the amount of scrap is often so great that it covers the oxy-fuel burners, in which event problems arise in respect of the space for tb flame of the burner for the combustion process, the efficiency of the burner being thereby reduced. Hence, there is an urgent need for rapidly creating a space in the scrap to allow for the combustion. OBJECTS OF THE PRESENT INVENTION
One object of• the present invention is to realize a method of creating, with an oxy-fuel burner, a powerfully oxidizing flame which rapidly creates the necessary space for the flame of the burner.
A further object of the present invention is to realize a burner by means which it is possible to create a powerfully oxidizing flame which, in a brief space of time, creates the space necessary for the action an effect of the burner.
A further object of the present invention is to realize a burner which gives the powerfully oxidizing flame and may thereafter be employed as a conventional oxy-fuel burner. Yet a further object of the present invention is to realize an oxy-fuel burner which may also be utilized as an oxygen lance. SUMMARY OF THE INVENTION
These objects will be attained by means of a burner which includes a central oxygen nozzle, at least one fuel nozzle disposed radially outside the central oxygen nozzle, and at least peripheral oxygen nozzle in greater spaced apart relationship from the central oxygen nozzle than the fuel nozzle. The primary characterizing feature of this burner is that the central oxygen nozzle is designed as a laval nozzle. A further characterizing feature is that the central oxygen nozzle is supplied at a different oxygen pressure than the peripheral oxygen nozzle, separate conduits being connected to the oxygen nozzles.
The method according to the present invention is characterized in that the 'ratio between the amount of fuel through the fuel nozzle and the oxygen amount through the peripheral oxygen nozzle are regulated so as to obtain a substantially stoicio etric combustion; and that, for generating the powerfully oxidizing flame, oxygen is caused to flow at great speed through the central oxygen nozzle, the speed of flow of the oxygen through the .central oxygen nozzle being preferably higher than the speed of sound for oxygen.
In the employment of the burner as an oxygen lance, there is no flame, in which event only the fuel supply is throttled or both fuel supply and oxygen supply to the peripheral nozzle are throttled.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
The nature of the present invention, its aspects and advantageous embodiments, will be more readily understood from the following brief description of the accompanying drawings and discussion relating thereto.
In the accompanying drawings:
Fig. 1 illustrates the oxy-fuel burner according to the present invention in section through its longitudinal axis;
Fig. 2 illustrates another embodiment of the burner of Fig. 1; and
Fig. 3 illustrates yet a further embodiment of the burner according to the present invention in section through the longitudinal axis of the burner. DESCRIPTION OF PREFERRED EMBODIMENT Referring to. the drawings, the burner of Fig. 1 displays a casing 1 which defines a cylindrical oxygen chamber 21. The rear region of the casing 1 is provided with a flange 19, in which a wall 15 defining the oxygen chamber 21 is sealingly mounted by, for example, a number of bolts (not shown). An inlet 17 for oxygen is connected to the oxygen chamber 21. In the forward end of the burner, the casing 1 serves as the inner wall of a cooling jacket 3 surrounding the burner. The cooling jacket 3 is provided with an inlet 5 and an outlet 7 for coolant, which normally is water.
The burner further includes a centre body 9 in its forward region, the central body being held in spaced apart relationship from the casing 1 by spacers 11. The forward end of the central body is retracted in relation to the forward end of the casing 1, but may, naturally, also be flush with or ahead of the forward end of the casing. The space between the central body 9 and the casing 1 forms an annular gap which constitutes a first oxygen nozzle 13 through which oxygen may depart from the oxygen chamber 21. Centrally in the centre body 9 there is disposed a second nozzle 23 for oxygen, this nozzle being connected to a conduit 29 which passes through the rear wall 15 of the oxygen chamber 21. The second oxygen nozzle 23 is designed as a laval nozzle. The inlet 19 and the conduit 29 are each connected to their oxygen source, it being possible to obtain, in the conduit 29, a greater pressure than in the oxygen chamber 21.
A compartment 27 is disposed at the rear end of the centre body 9, the compartment surrounding the conduit 29 and being defined at its' forward end by the centre body 9. Concentrically with the second oxygen nozzle 23, there is disposed in the centre body an annular nozzle 25 or a plurality of nozzles 25 arranged about the second oxygen nozzle 23, these preferably being disposed symmetrically in a ring concentrically with the second oxygen nozzle 23. The nozzle 25, 26 connects the chamber 27 with the outside of the burner. A conduit 31 is connected to the compartment 27, this conduit, like the. conduit 29, passing through the oxygen chamber 21 and departing from the burner through the rear defining wall 15. The conduit 31 is connected to a source of fuel, preferably gaseous fuel. The chamber 27 serves as a distribution chamber for the fuel to the fuel nozzle 25, 26.
The burner of Fig. 2 is similar to that of Fig. 1. Those parts and details of the burner according to Fig. 2 which are identical with corresponding parts and details in Fig. 1 have been given the same reference numeral. The burner of Fig. 2 displays a casing 2 which defines a cylindrical oxygen chamber 22. The rear region of the casing 2 is provided with a flange 19 in which a wall 15 defining the oxygen chamber 22 is'-seal ingly mounted. For example, a seal may be disposed between the flange 19 and the wall 15. An inlet 17 for oxygen is connected to the oxygen chamber 22. As opposed to the casing 1 of Fig. 1, the casing 2 lacks the cooling jacket. The casing 2 may, for instance, consist of a ceramic material or an ultra-high-temperature alloy, such as a cemented carbide. The forward bounding definition of the oxygen chamber is a central body 10 disposed in the forward end of the burner. The inlet 17 and the conduit 29 are each connected to their source of oxygen, it being possible in the conduit 29 to achieve a greater pressure than- in the oxygen chamber. The central body 10 sealingly abuts against the inside of the casing 2, and its forward edge is here flush with the forward edge of the casing 2. Centrally within the central body 10, there is disposed an oxygen nozzle 23 which is designed as a laval nozzle and corresponds to the second nozzle of the burner according to Fig. 1. The second oxygen nozzle 23 is, at its end facing away from the forward face of the burner, connected to the conduit 29 for oxygen. About the conduit 29 for oxygen there is disposed a fuel distribution chamber 27, whose forward bounding definition is the central body 10. Concentrically with the second oxygen nozzle 23, there is disposed, in the central body 10, an annular nozzle 25, or a number of nozzles 26 disposed about the second oxygen nozzle 23, these nozzles 26 being preferably arranged symmetrically in a ring which lies concentrically outside the second oxygen' nozzle 23. The nozzle 25, 26 connects the fuel distribution chamber 27 with the outside of the burner. Thus, the nozzle 25, 26 is a fuel nozzle. A conduit 31 is connected to the chamber 27, this conduit, like the conduit 29 for oxygen, passing through the oxygen chamber 22 and departing therefrom through the rear defining wall 15 of the burner. The conduit 31 is connected to a fuel source, preferably gaseous fuel.
The side wall of the fuel chamber is located in spaced apart relationship from the casing 2, such that the forward bounding definition of the oxygen chamber 22 consists of the central body 10. Concentrically outside the fuel nozzle 25, 26, there is provided an odd number of nozzles 14 of which one is shown on the drawing. These are disposed in a ring. The nozzle 14 may also consist of an annular nozzle 14 corresponding to the first oxygen nozzle 13 in Fig. 1. When the first oxygen nozzle 14 and the fuel nozzle 25, 26 consist of a number of nozzles 14 and 26, respectively, arranged concentrically in a ring, these may be cylindrical and straight or cylindrical and helical, in which latter case the helical portion is at most 90 degrees. These nozzles may also be trunco-conical , the base of the truncated cone then facing forwards. The first oxygen nozzles may also be designed as laval nozzles.
The burner according to Fig. 3 is very similar to the burner of Fig. 1. The gap which constitutes the peripheral oxygen nozzle 13 in Fig. 1 has, in this figure, been replaced by a make-up piece 16 between the central body 9 and the casing 1. The make-up piece 16 includes a number of nozzles 20 arranged in a ring, these likening the nozzles 14 of Fig. 2, but may also consist of an annular nozzle. The forward edge of the make-up piece is displaced in relation to both the forward edge of the casing 1 and the forward edge of the central body 9. In the illustrated embodiment, the make-up piece 16 is shorter than the central body 9.
Naturally, the peripheral oxygen nozzles, like the fuel nozzles, may be odd or even in number. The first and second oxygen nozzle (13, 14; 20, 23, respectively) are designated oxygen nozzles. It is, naturally, possible to use gas mixtures with oxygen instead of pure oxygen. However, in such instance it is appropriate that the oxygen content be at least 50 per cent by volume.
In the employment of the burner according to Fig. 1, coolant is supplied to the inlet 5 of the cooling jacket 3, this coolant departing from the jacket 3 through the outlet 7. Oxygen is supplied through the inlet 17 to the oxygen chamber 21, this oxygen departing therefrom through the nozzle 13, and fuel, for example natural gas, is supplied through the conduit 31 where it is dissipated in the chamber 27 and departs therefrom through the nozzle 25, 26. Normally, oxygen is supplied to the oxygen chamber 21 and fuel through the conduit 31 in such volumes and at such proportions that there will be obtained stoiciometric combustion with a suitable flame size. The burner then functions as a conventional oxy-fuel burner. ' When the intention is to employ the burner to generate a powerfully oxidizing flame, the burner is ignited on the supply of oxygen to the nozzle 13 and fuel to the nozzle 25, 26. Thereafter, oxygen is supplied at high pressure to the conduit 29, this oxygen departing from the burner through the second oxygen nozzle 23 which is designed as a laval nozzle. By such means, it is possible to impart to the oxygen departing from the nozzle 23 extremely high speed, for example higher speed than the sonic speed in oxygen. The thus obtained powerfully oxidizing flame may be used for rapidly creating a.space about the burner in those cases when a charge supplied to a furnace covers the burner and prevents, or at least seriously obstructs the normal function of a conventional oxy-fuel burner. When the desired space for the burner has been created, the oxygen supply to the central nozzle 23 for oxygen is cut off. The burner thereafter functions as a conventional oxy-fuel burner. The ratio between the volume of oxygen supplied to the burner through the central nozzle 23 and the peripheral nozzle 13, 14 and 20 may vary within broad limits. In the generation of a powerfully oxidizing flame, the ratio is normally greater than 0.5, preferably greater than 1. The burner will also be employed as a conventional oxygen lance. In such instance, only oxygen is supplied to the burner, preferably solely through the second oxygen nozzle 23 which is designed as- a laval nozzle, or also through the first oxygen nozzle 13 which is also preferably designed as a laval nozzle. In respect of the configuration of the annular first oxygen nozzle - this configuration corresponding to a laval nozzle - this is taken to mean that the cross-sectional area of the nozzle 13, viewed from the oxygen chamber to the nozzle aperture, changes in the same manner as does a laval nozzle. Naturally, the burner according to Figs. 2 and 3 may be employed in the same manner as the burner of Fig. 1. These embodiments of the burner should not be considered as different burners but as a single burner in which corresponding details and parts have been given a different configuration and design.

Claims

WHAT WE CLAIM AND DESIRE TO SECURE BY LETTERS PATENT IS:
1. A method of generating a powerfully oxidizing flame in an oxy-fuel burner which includes a central oxygen nozzle, at least one fuel nozzle disposed outside the oxygen nozzle, and at least " one peripheral oxygen nozzle disposed at greater radial spaced apart relationship from the central oxygen nozzle than the fuel nozzle, characterized in that the ratio between amount of fuel through the fuel nozzle and amount of oxygen through the peripheral ' oxygen nozzle is regulated so as to obtain a substantially stoiciometric combustion; and that oxygen is caused to flow at great speed through the central oxygen nozzle.
2. The method as claimed in Claim 1, characterized in that the speed of the oxygen through the central oxyien nozzle is greater than the sonic speed of oxygen.
3. The method as claimed in Claim 1 or 2, characterized in that the ratio between the amount of oxygen through the central oxygen nozzle and the amount of oxygen through the peripheral oxygen nozzle is at least 0.5.
4. A burner including a central body (9, 10) with a central oxygen nozzle (23), at least one fuel nozzle (25, 26), a casing
(1, 2) surrounding the central body (9, 10), at least one peripheral oxygen nozzle (13, 14, 20) radially outside the fuel nozzle (25, 26), and an oxygen chamber (21) outside the central body (9, 10), characterized in that the central oxygen nozzle (23) is designed as a laval nozzle.
5. The burner as claimed in Claim 4, characterized in that the peripheral oxygen nozzle (13, 14, 20) is in communication with the oxygen chamber (21); and that the central oxygen nozzle (23) is connected to a separate conduit (29) for oxygen.
6. The burner as claimed in Claim 4 or 5, characterized in that a fuel chamber (27) surrounding the separate conduit (29) for oxygen is disposed in the oxygen chamber (21), said fuel chamber
(27) being in direct communication with the fuel nozzle (25, 26).
7. The burner as claimed any one or more of Claims 4-6, characterized in that the peripheral oxygen nozzle (13, 14, 20) consists of an annular channel (13) between the central body (9) and the casing (1), spacers (11) centring the central body (9).
8. The burner as claimed in any one or more of Claims 4-6, characterized in that the burner includes a number of peripheral oxygen nozzles (14, 20) disposed outside the fuel nozzle (25, 26) and arranged concentrically with the central oxygen nozzle (23); and- that said peripheral oxygen nozzles (14, 20) are designed as laval nozzles.
9. The burner as claimed in Claim 4, characterized in that the peripheral oxygen nozzle (13, 14, 20) is designed as an annular channel (13); and that the width of said annular channel (13) varies along the longitudinal direction of said channel in a manner corresponding to a laval nozzle.
10. The burner as claimed in any one or more of Claims 4-9, characterized in that the fuel nozzle (25, 26) is an annular nozzle (26) which concentricall " surrounds the central oxygen nozzle (23), or consists of a number of nozzles (25) in a ring which concentrically surrounds the central oxygen nozzle (23).
11. Use of a burner which includes a central body (9, 10) with a central oxygen nozzle (23) and at least one fuel nozzle (25, 26), a casing (1, 2) surrounding the central body (9, 10), at least one peripheral oxygen nozzle (13, 14, 20) radially outside said fuel nozzle (25, 26), and an oxygen chamber (21) outside the body (9, 10), fuel supply being wholly throttled, as an oxygen lance.
PCT/SE1987/000392 1987-09-02 1987-09-02 A method to generate an oxidizing flame, a burner and a use for a burner WO1989002051A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
PCT/SE1987/000392 WO1989002051A1 (en) 1987-09-02 1987-09-02 A method to generate an oxidizing flame, a burner and a use for a burner
BR8707994A BR8707994A (en) 1987-09-02 1987-09-02 METHOD TO GENERATE A WEST FLAME, BURNER AND USE FOR A BURNER
EP87906117A EP0393020A1 (en) 1987-09-02 1987-09-02 A method to generate an oxidizing flame, a burner and a use for a burner
NO90900985A NO166671C (en) 1987-09-02 1990-03-01 OBSERVING FLAMES AND BURNS.
DK053990A DK53990D0 (en) 1987-09-02 1990-03-01 PROCEDURE FOR GENERATING AN OXIDATING FLAME, A BURNER AND THE USE OF A BURNER
FI901050A FI901050A0 (en) 1987-09-02 1990-03-01 FOERFARANDE FOER GENERERING AV EN OXIDERANDE FLAMMA, EN BRAENNARE SAMT EN ANVAENDNING FOER EN BRAENNARE.

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PCT/SE1987/000392 WO1989002051A1 (en) 1987-09-02 1987-09-02 A method to generate an oxidizing flame, a burner and a use for a burner

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WO1989002051A1 true WO1989002051A1 (en) 1989-03-09

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BR (1) BR8707994A (en)
DK (1) DK53990D0 (en)
FI (1) FI901050A0 (en)
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WO (1) WO1989002051A1 (en)

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0390766A1 (en) * 1989-03-28 1990-10-03 CENTRE DE RECHERCHES METALLURGIQUES CENTRUM VOOR RESEARCH IN DE METALLURGIE Association sans but lucratif A method of injecting an auxiliary fuel into a blast furnace
EP0597270A2 (en) * 1992-11-11 1994-05-18 KCT TECHNOLOGIE GmbH A method for operating a multimedia tuyère and the tuyère system
EP0686807A1 (en) * 1994-06-10 1995-12-13 DANIELI & C. OFFICINE MECCANICHE S.p.A. Rotary burner
WO1996000798A1 (en) * 1994-06-29 1996-01-11 Ingitec Gbr Nozzle system for a device for melting iron metallic materials in a coke-heated cupola furnace
EP0705656A3 (en) * 1991-12-09 1996-05-15 Esab Welding Products Inc
WO1997009566A1 (en) * 1995-09-07 1997-03-13 Voest-Alpine Industrieanlagenbau Gmbh Process for burning fuel
EP0777751A1 (en) * 1994-08-29 1997-06-11 American Combustion, Inc. Method and apparatus for electric steelmaking
EP0823592A2 (en) 1996-08-05 1998-02-11 The BOC Group plc Oxygen-fuel burner
EP0850883A2 (en) * 1996-12-26 1998-07-01 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Process for making technical glass and burner for carrying out said method
US5843368A (en) * 1994-08-29 1998-12-01 American Combustion, Inc. Apparatus for electric steelmaking
EP0918093A1 (en) * 1997-11-20 1999-05-26 Praxair Technology, Inc. Coherent jet injector lance
US5927960A (en) * 1995-09-21 1999-07-27 The Boc Group Plc Burner
EP0965649A1 (en) * 1998-06-17 1999-12-22 Praxair Technology, Inc. Supersonic coherent gas jet for providing gas into a liquid
US6139310A (en) * 1999-11-16 2000-10-31 Praxair Technology, Inc. System for producing a single coherent jet
US6171544B1 (en) 1999-04-02 2001-01-09 Praxair Technology, Inc. Multiple coherent jet lance
EP1132684A3 (en) * 2000-03-10 2002-05-02 L'air Liquide, S.A. à Directoire et Conseil de Surveillance pour l'Etude et l'Exploitation des Procédés Georges Claude Method and system for lancing gas into an environment with variable entrainment of non-lanced gas
KR20040032298A (en) * 2002-10-09 2004-04-17 주식회사 태성산전 Torch for industrial burner
WO2006087189A1 (en) * 2005-02-18 2006-08-24 Techint Compagnia Tecnica Internazionale S.P.A. Multifuncion injector and relative combustion process for metallurgical treatment in an electric arc furnace
US7775791B2 (en) 2008-02-25 2010-08-17 General Electric Company Method and apparatus for staged combustion of air and fuel
EP2626628A1 (en) * 2012-02-09 2013-08-14 Linde Aktiengesellschaft Furnace of a rotary kiln
CN104296137A (en) * 2013-07-19 2015-01-21 湖南水口山有色金属集团有限公司 Combustor
US10845052B1 (en) 2019-12-20 2020-11-24 Jupiter Oxygen Corporation Combustion system comprising an annular shroud burner
WO2022184692A1 (en) * 2021-03-02 2022-09-09 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Oxy-fuel burner, ignition and flame control system and method for controlling ignition and flame

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2195384A (en) * 1937-04-08 1940-03-26 Linde Air Prod Co Metal cutting process
US3202201A (en) * 1962-01-15 1965-08-24 Chemetron Corp Gas burner for melting and refining scrap metal
GB1138311A (en) * 1965-02-17 1969-01-01 Osterreichisch Alpine Montange A method of and burner for heating an open hearth furnace
GB1234052A (en) * 1968-08-15 1971-06-03
DE2056736A1 (en) * 1970-11-18 1972-05-25 Philips Patentverwaltung Gmbh, 2000 Hamburg Natural gas burner
US4173499A (en) * 1976-07-27 1979-11-06 Linde Aktiengesellschaft Method of operating a cutting burner
US4421273A (en) * 1977-03-18 1983-12-20 Aga Aktiebolag Method and apparatus for supplying oxygen gas for fuel combustion
EP0097883A1 (en) * 1982-06-26 1984-01-11 AUTE Gesellschaft für autogene Technik mbH One piece short nozzle for a burner for thermo-chemical cutting or planing
EP0103651A1 (en) * 1982-09-17 1984-03-28 AUTE Gesellschaft für autogene Technik mbH Short tip for flame cutting or flame priming

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2195384A (en) * 1937-04-08 1940-03-26 Linde Air Prod Co Metal cutting process
US3202201A (en) * 1962-01-15 1965-08-24 Chemetron Corp Gas burner for melting and refining scrap metal
GB1138311A (en) * 1965-02-17 1969-01-01 Osterreichisch Alpine Montange A method of and burner for heating an open hearth furnace
GB1234052A (en) * 1968-08-15 1971-06-03
DE2056736A1 (en) * 1970-11-18 1972-05-25 Philips Patentverwaltung Gmbh, 2000 Hamburg Natural gas burner
US4173499A (en) * 1976-07-27 1979-11-06 Linde Aktiengesellschaft Method of operating a cutting burner
US4421273A (en) * 1977-03-18 1983-12-20 Aga Aktiebolag Method and apparatus for supplying oxygen gas for fuel combustion
EP0097883A1 (en) * 1982-06-26 1984-01-11 AUTE Gesellschaft für autogene Technik mbH One piece short nozzle for a burner for thermo-chemical cutting or planing
EP0103651A1 (en) * 1982-09-17 1984-03-28 AUTE Gesellschaft für autogene Technik mbH Short tip for flame cutting or flame priming

Cited By (40)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0390766A1 (en) * 1989-03-28 1990-10-03 CENTRE DE RECHERCHES METALLURGIQUES CENTRUM VOOR RESEARCH IN DE METALLURGIE Association sans but lucratif A method of injecting an auxiliary fuel into a blast furnace
EP0705656A3 (en) * 1991-12-09 1996-05-15 Esab Welding Products Inc
EP0597270A2 (en) * 1992-11-11 1994-05-18 KCT TECHNOLOGIE GmbH A method for operating a multimedia tuyère and the tuyère system
EP0597270A3 (en) * 1992-11-11 1994-09-07 Kct Tech Gmbh A method for operating a multimedia tuyere and the tuyere system.
US5630713A (en) * 1994-06-10 1997-05-20 Danieli & C. Officine Meccaniche Spa Rotary burner
EP0686807A1 (en) * 1994-06-10 1995-12-13 DANIELI & C. OFFICINE MECCANICHE S.p.A. Rotary burner
WO1996000798A1 (en) * 1994-06-29 1996-01-11 Ingitec Gbr Nozzle system for a device for melting iron metallic materials in a coke-heated cupola furnace
EP0777751A4 (en) * 1994-08-29 1998-04-22 American Combustion Inc Method and apparatus for electric steelmaking
US5904895A (en) * 1994-08-29 1999-05-18 American Combustion, Inc. Apparatus for electric steelmaking
EP1123982A1 (en) * 1994-08-29 2001-08-16 American Combustion, Inc. Method and apparatus for electric steelmaking
US5954855A (en) * 1994-08-29 1999-09-21 American Combustion, Inc. Method for electric steelmaking
EP0777751A1 (en) * 1994-08-29 1997-06-11 American Combustion, Inc. Method and apparatus for electric steelmaking
US5843368A (en) * 1994-08-29 1998-12-01 American Combustion, Inc. Apparatus for electric steelmaking
US6142765A (en) * 1995-09-07 2000-11-07 Vost-Alpine Industrieanlagenbau Gmbh Process for burning fuel
WO1997009566A1 (en) * 1995-09-07 1997-03-13 Voest-Alpine Industrieanlagenbau Gmbh Process for burning fuel
US5927960A (en) * 1995-09-21 1999-07-27 The Boc Group Plc Burner
EP0823592A2 (en) 1996-08-05 1998-02-11 The BOC Group plc Oxygen-fuel burner
EP0850883A3 (en) * 1996-12-26 1998-07-08 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Process for making technical glass and burner for carrying out said method
FR2757844A1 (en) * 1996-12-26 1998-07-03 Air Liquide TECHNICAL GLASS MANUFACTURING PROCESS AND BURNER FOR THE IMPLEMENTATION OF SUCH A PROCESS
EP0850883A2 (en) * 1996-12-26 1998-07-01 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Process for making technical glass and burner for carrying out said method
US6332340B1 (en) 1996-12-26 2001-12-25 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Process for manufacturing technical glass and burner for implementing such a process
EP0918093A1 (en) * 1997-11-20 1999-05-26 Praxair Technology, Inc. Coherent jet injector lance
KR100486184B1 (en) * 1998-06-17 2005-05-03 프랙스에어 테크놀로지, 인코포레이티드 Supersonic coherent gas jet for providing gas into a liquid
US6176894B1 (en) 1998-06-17 2001-01-23 Praxair Technology, Inc. Supersonic coherent gas jet for providing gas into a liquid
AU742691B2 (en) * 1998-06-17 2002-01-10 Praxair Technology, Inc. Supersonic coherent gas jet for providing gas into a liquid
US6383445B1 (en) 1998-06-17 2002-05-07 Praxair Technology, Inc. Supersonic coherent gas jet for providing gas into a liquid
EP0965649A1 (en) * 1998-06-17 1999-12-22 Praxair Technology, Inc. Supersonic coherent gas jet for providing gas into a liquid
US6171544B1 (en) 1999-04-02 2001-01-09 Praxair Technology, Inc. Multiple coherent jet lance
US6139310A (en) * 1999-11-16 2000-10-31 Praxair Technology, Inc. System for producing a single coherent jet
EP1132684A3 (en) * 2000-03-10 2002-05-02 L'air Liquide, S.A. à Directoire et Conseil de Surveillance pour l'Etude et l'Exploitation des Procédés Georges Claude Method and system for lancing gas into an environment with variable entrainment of non-lanced gas
KR20040032298A (en) * 2002-10-09 2004-04-17 주식회사 태성산전 Torch for industrial burner
WO2006087189A1 (en) * 2005-02-18 2006-08-24 Techint Compagnia Tecnica Internazionale S.P.A. Multifuncion injector and relative combustion process for metallurgical treatment in an electric arc furnace
US7611563B2 (en) 2005-02-18 2009-11-03 Techint Compagnia Tenica Internazionale S.p.A. Multifunction injector and relative combustion process for metallurgical treatment in an electric arc furnace
US7775791B2 (en) 2008-02-25 2010-08-17 General Electric Company Method and apparatus for staged combustion of air and fuel
GB2457565B (en) * 2008-02-25 2012-10-03 Gen Electric Method and apparatus for staged combustion of air and fuel
EP2626628A1 (en) * 2012-02-09 2013-08-14 Linde Aktiengesellschaft Furnace of a rotary kiln
CN104296137A (en) * 2013-07-19 2015-01-21 湖南水口山有色金属集团有限公司 Combustor
US10845052B1 (en) 2019-12-20 2020-11-24 Jupiter Oxygen Corporation Combustion system comprising an annular shroud burner
US11781751B2 (en) 2019-12-20 2023-10-10 Jupiter Oxygen Corporation Combustion system comprising an annular shroud burner
WO2022184692A1 (en) * 2021-03-02 2022-09-09 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Oxy-fuel burner, ignition and flame control system and method for controlling ignition and flame

Also Published As

Publication number Publication date
NO166671C (en) 1991-08-21
BR8707994A (en) 1990-05-22
DK53990A (en) 1990-03-01
NO900985D0 (en) 1990-03-01
NO900985L (en) 1990-03-01
DK53990D0 (en) 1990-03-01
FI901050A0 (en) 1990-03-01
NO166671B (en) 1991-05-13
EP0393020A1 (en) 1990-10-24

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