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
  • F23D14/46—Details
  • F23D14/84—Flame spreading or otherwise shaping
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
  • C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
  • C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
  • C03B5/235—Heating the glass
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
  • C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
  • C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
  • C03B5/235—Heating the glass
  • C03B5/2353—Heating the glass by combustion with pure oxygen or oxygen-enriched air, e.g. using oxy-fuel burners or oxygen lances
• • 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
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
  • C03B2211/00—Heating processes for glass melting in glass melting furnaces
  • C03B2211/30—Heating processes for glass melting in glass melting furnaces introducing oxygen into the glass melting furnace separately from the fuel
• • 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
  • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
  • Y02P40/00—Technologies relating to the processing of minerals
  • Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping

Definitions

• the present invention relates to a burner assembly with increased flexibility and in particular such a dual-fuel burner and / or staged combustion.
• burners including staged burners, for heating a load in an oven, such as a melting furnace.
• Burner maintenance usually involves inspecting the condition of fuel injectors or rods, cleaning or replacing them.
• the shutdown of the burner corresponds to a stop of the heating of the oven.
• such an approach causes a change in the thermal profile of the oven during the shutdown of the burner. It is obvious that the control of the temperature field in an industrial oven is essential for the performance of the oven and the quality of the product from the oven.
• the passage of a burner from a first fuel to a second fuel generally requires the replacement of the fuel injectors and therefore normally a deactivation of the burner. This may take several hours in the case of cold reagents, but may take several days in the case of preheated reagents.
• the present invention provides a burner assembly that allows maintenance of the fuel rods without having to stop the burner, or without having to reduce the power of the burner.
• the present invention also provides a burner assembly that allows the passage of a first fuel to a second fuel or a combination of several fuels and vice versa without having to stop the burner, or without having to reduce the power of the burner.
• the present invention relates more particularly to a burner assembly comprising:
• a first fuel supply device is provided.
• the burner block has an inlet face and an outlet face, at least one oxidant passage between the inlet face and the outlet face and at least one fuel cane passage between the inlet face and the outlet face. entrance and the exit face.
• Said burner block is such that m fuel rods can simultaneously be mounted in the burner block through the at least one fuel rod passage, with m> 1.
• Each of the first fuel rods is adapted to be mounted in the or in one of the fuel rod passages and to be removed from said fuel rod passage by the inlet face of the burner block. For the maintenance of said rods, it is indeed important to be able to introduce and remove the rods without the rods, the burner unit and in particular the fuel rod passage or passages are damaged.
• the oxidizer feed device is adapted to transport an oxidant flow from an oxidizer source to the burner block for its injection through the at least one oxidant passage in a combustion zone located downstream of the exit face. .
• the first fuel supply device is capable of transporting a flow of a first fuel from a source of first fuel to the burner block for injection into the combustion zone through one or more cane passages. of fuel.
• This first fuel supply device comprises a first feed line, a first flow meter, a first distributor and n first flexible lines connecting the first distributor to the n first fuel rods.
• the first feed line is more particularly adapted to transport said flow of the first fuel from the first fuel source to the first distributor.
• the first flow meter is capable of regulating the flow rate of the flow of the first fuel from the first fuel source to the first distributor and the first distributor is able to distribute the flow of first fuel in n subsidiary streams on the n first flexible lines.
• the flexible lines greatly facilitate the introduction of the fuel rods into the fuel rod passage (s) and the withdrawal of the fuel rods from said passages.
• the burner assembly according to the present invention is characterized in that the first fuel supply device comprises one or more valves for closing and opening the first n flexible lines one by one so that when x n first flexible lines are closed by said one or more valves, with 1 ⁇ x ⁇ n-1, the first distributor distributes the first fuel flow on nx first flexible lines which are open for injection into the combustion zone by the first fuel rod or rods connected to said first open flexible lines.
• the burner assembly according to the invention thus makes it possible, during the maintenance of one or even several of its first fuel rods, to keep the burner assembly in operation without having to reduce the level of the power supplied by said first burner assembly. set burner to the combustion zone. In this way, the effect of maintenance of the first fuel rods on the thermal profile in the furnace, and therefore on the productivity of the furnace and / or the quality of the product from the furnace, is greatly reduced.
• Each first flexible line may, for example, be provided with a valve for opening and closing this flexible line.
• the first fuel supply device may also include a valve that selectively closes and opens one or more of the first flexible lines.
• the burner assembly may comprise a central control unit for opening and closing the first flexible lines by the valve (s) of the first fuel supply device and / or means for the manual operation of this or these valves. .
• a flexible line is closed when it does not allow the passage of a fuel flow and a flexible line is open when it allows the passage of a fuel flow through the flexible line .
• the first fuel may in particular be a gaseous fuel (such as natural gas) or a liquid fuel, such as fuel oil.
• the number n of first fuel rods is equal to the number m of fuel rod passages in the burner block.
• the number n of first fuel rods is equal to the number m of fuel rod passes +1.
• a reserve fuel source connected by means of a reserve fuel supply device to a reserve fuel rod, so as to be able, for a burner assembly having in normal operation, an injection of the first fuel into the combustion zone by means of first fuel rods, when one of the first fuel rods for its maintenance is shut down by closing the corresponding first flexible line, replaced in the burner block, the cane of first fuel in maintenance by this reserve fuel cane and thus be able to operate the whole burner with m-1 canes of first fuel and the reserve fuel cane during the maintenance of one of the rods first fuel.
• Such an operating mode is particularly indicated in the case of a furnace or other industrial installation comprising a large number of burner assemblies.
• the reserve fuel may also be a gaseous or liquid fuel.
• the reserve fuel is advantageously a liquid fuel, especially given the ease of storage and transport of such fuel.
• the reserve fuel may be of the same type (gaseous, liquid, etc.) as the first fuel or of a different type.
• the composition of the reserve fuel may correspond to or be different from the composition of the first fuel.
• the present invention also relates to a burner assembly as described above and which also comprises: • second fuel rods, with p> 1 and • a second fuel supply device.
• Each of said second fuel rods is adapted to be mounted in the or in one of the fuel rod passages and to be removed from said fuel cane passage by the inlet face, as already indicated above for the rods of the first combustible.
• the second fuel device is adapted to transport a flow of a second fuel from a second fuel source to the burner unit for injection into the combustion zone through one or more fuel passages.
• the second fuel supply device comprises a second feed line, a second flow meter, a second distributor and second flexible lines connecting the second distributor to the second fuel rods.
• the second feed line is able to transport the flow of the second fuel from the second fuel source to the second distributor.
• the second flow meter is able to regulate the flow rate of the second fuel flow from the second fuel source to the second distributor.
• the second distributor is able to distribute the flow of second fuel in p subsidiary streams on p second flexible lines.
• the second fuel supply device comprises one or more valves for closing and opening the p second flexible lines one by one so that when there are p second lines hoses are closed by said one or more valves, with 1 ⁇ y ⁇ p - 1, the second distributor distributes the flow of second fuel on the py or second flexible lines which are open for injection into the combustion zone by the or the connected second fuel rods audit or said second flexible lines open.
• Each second flexible line may, for example, be provided with a valve for opening and closing this flexible line.
• the second fuel supply device may also include a valve that selectively closes and opens one or more of the second flexible lines.
• the burner assembly may comprise a central control unit for opening and closing the second flexible lines by the valve (s) of the second fuel supply device and / or means for the manual operation of this or these valves. .
• the second fuel may in particular be a gaseous fuel or a liquid fuel.
• the second fuel can be of the same type (gaseous, liquid, ...) as the first fuel, but in practice is usually of a different type.
• the reserve fuel may also be a gaseous or liquid fuel.
• the reserve fuel is advantageously a liquid fuel, such as fuel oil, in particular given the ease of storage and transport of such
• the number n of first fuel rods may be equal to the number p of second fuel rods.
• the number p of second fuel rods may be equal to the number m of fuel rod passages of the burner block.
• the number p of second fuel rods may be equal to the number m of fuel rod passes +1.
• the burner assembly according to the invention can be used in aerocombustion, but is particularly useful for oxy combustion applications.
• the invention thus relates in particular to a burner assembly in which the source of oxidant is a source of oxidant having an oxygen content of at least 80% vol, preferably at least 90% vol.
• the burner assembly according to the invention is particularly advantageous for staged combustion.
• the staged combustion method of the fuels consists of dividing the quantity of oxidant required for the total combustion of the fuel into at least two oxidant streams introduced into the combustion zone at different distances from the injection of the fuel stream (s) in this zone. of combustion.
• at least a first oxidant stream is injected at a very close distance from or together with the fuel stream (s).
• the oxidant injected by this or these oxidant streams injected (s) closest or with the fuel flow (s) is called primary oxidizer.
• the other oxidant stream (s) are injected into the combustion zone at a greater distance from the fuel than the primary oxidant.
• the oxidant thus injected makes it possible to complete the combustion of the unreacted fuel with the primary oxidant.
• the oxidant injected by this or these last streams is called secondary oxidizer.
• WO 02/081967 discloses a method for implementing this type of staged combustion method.
• the oxidant is separated into three distinct streams, which are injected at different distances from the fuel injection point and at different speeds.
• a first oxidant jet is injected with a high velocity at the center of the fuel jet.
• a second oxidant jet is injected with a lower velocity at a first distance from the fuel jet.
• a third jet of oxidant is injected at a second distance from the fuel jet, this second distance being greater than the first distance.
• the invention thus also relates to a burner assembly in which the oxidizer supply device is capable of carrying several oxidant streams from an oxidant source to the burner block for its injection through the at least one oxidant passage in the combustion chamber.
• combustion zone at least one of said oxidant streams being a secondary oxidant stream injected into the combustion zone through an oxidant passage located at a distance ds> 0 from the fuel cannel passage (s) and at least one of said flows oxidant being a primary oxidant stream injected into the combustion zone through the or one of the fuel cane passages or through an oxidant passage located at a distance dp from the fuel cane passage (s), with 0 ⁇ dp ⁇ ds.
• At least one of the oxidant flow is a primary oxidant flow injected through the or one of the fuel cane passages around one or more rods. of fuel.
• a high-temperature oxidizer namely a temperature of at least 100 0 C, or even several hundred degrees to improve the energy efficiency of combustion.
• the oxidizer supply device comprises means for heating the at least one secondary oxidant flow at a temperature of at least 100 ° C. upstream of the burner block. , said oxidizer supply device not comprising means for heating the at least one primary oxidant flow.
• Said primary oxidant which is injected into the combustion zone through the one or more passages of fuel rods or through an oxidizer passage or passages located at a distance dp or passages of fuel rods, is not heated or preheated to a temperature of 100 ° C. or more at the burner block inlet .
• the secondary oxidant is preheated to a temperature at the burner block inlet between 100 ° C. and 650 ° C., preferably between 100 ° C. and 600 ° C., and more preferably between 350 ° C. and 550 ° C. .
• This embodiment makes it possible to improve the energy efficiency by using a preheated oxidant for the secondary oxidizer, while maintaining the enhanced flexibility of the burner according to the invention, particularly with regard to the maintenance of the fuel rods. and / or the passage of a first fuel to a second fuel or a combination of several fuels, and this through the use of an unheated oxidant for the primary oxidant.
• the unheated primary oxidizer provides only a very small fraction of the total oxidant required for total fuel combustion. This fraction is usefully less than 10% of the total oxidant.
• this proportion is between 1.5 and 7% of the total oxidant needed to ensure complete combustion of the fuel.
• the benefit of using a hot oxidizer is not significantly affected by this very small fraction of unheated oxidant.
• no (pre) heated it is meant that the oxidizer (primary) is in the essentially ambient temperature conditions prevailing on its path to the furnace. As the refractory walls of the furnace pass, its temperature necessarily rises.
• the temperature of the (pre) heated oxidizer is preferably room temperature and should not exceed one hundred degrees Celsius, the temperature in the vicinity of the oven being nevertheless substantially higher than that of the atmosphere away from the oven.
• the primary oxidant and the secondary oxidant may have the same or different composition.
• they can be supplied by the same source of oxidant, such as, for example, a unit for separating the gases from the air, the secondary oxidant passing through, upstream of the burner block, means for preheating said secondary oxidant, such as in particular heat exchangers, while the primary oxidant does not cross means for its preheating upstream of the burner block.
• the burner block can consist of a single brick.
• the burner unit may also advantageously consist of a set of several bricks, typically refractory bricks.
• the burner block consists of several bricks
• said bricks can be spaced, especially when the burner assembly is mounted in a wall of an oven.
• the use of a burner block which consists of several bricks allows in particular a more spaced staging of the combustion, that is to say: the injection of at least one jet of secondary oxidant at a greater distance from the or fuel injections.
• a burner block that consists of several bricks may also allow for more spaced injection of different fuel streams.
• the invention relates in particular to a burner assembly in which the burner unit is mounted in a wall of an oven, the combustion zone downstream of the outlet face being located inside the oven.
• the invention also relates to an oven comprising such a burner assembly.
• the invention also relates to the use of one or more of these burner assemblies for combustion of oxidant and fuel in a combustion zone and in particular in such a combustion zone inside an oven, and that any combustion process by means of a burner assembly or a furnace according to the invention.
• the invention particularly relates to the use of one or more burner assemblies for performing staged combustion in the combustion zone, and in particular staged combustion with one or more unheated primary oxidant streams and one or more heated secondary oxidizer.
• FIG. 1 is a diagrammatic representation of the operation of the fuel supply devices and oxidant of a staged combustion burner assembly according to the invention
• FIGS. 2 and 3 are diagrammatic representations of the operation of the fuel and oxidizer feed devices of an embodiment of a staged combustion burner assembly according to the invention with a first fuel reserve rod connected to the first distributor before and during a maintenance procedure of a first fuel rod,
• FIG. 4 is a schematic representation of the operation of the fuel and oxidizer feed devices of an embodiment of a staged combustion burner assembly according to the invention with a reserve rod connected to a reserve fuel source.
• FIGS. 5 and 6 are diagrammatic representations of the operation of the fuel and oxidizer feed devices of an embodiment of a staged combustion burner assembly according to the invention during and after the change of a first fuel to a second fuel.
• the first feed line 100 of the first fuel supply device connects a first fuel source (not shown) to the first distributor 101.
• the first fuel flow from the first fuel source to the first fuel distributor is regulated by a first flowmeter (not shown).
• the first fuel supply device also comprises two valves 130 and 131 for closing and opening the first flexible lines 120 and 121 individually.
• the second feed line 200 of the second fuel supply device connects a second fuel source (not shown) to the second distributor 201.
• the second feed device comprises a second flow meter (not shown) for controlling a second fuel stream from the second fuel source to the second distributor.
• the oxidizer feed device has secondary oxidizer feed lines 504 for secondary oxidant transport to two secondary oxidant passages 506, 507 located at a distance ds from the fuel passages 110 or 111 respectively.
• oxidizer feed device also includes a primary oxidant feed system.
• the primary oxidant supply system comprises a primary oxidant supply line 508 and a primary oxidant distributor 509.
• the primary oxidant dispenser 509 is connected at the fuel passages 500 and 501 by lines 510, 511.
• the two valves 530 and 531 make it possible to open and close the two primary oxidant lines 510 and 511.
• the burner assembly operates with m-1 first fuel rods during the maintenance of one of the first fuel rods.
• the power of the burner can remain constant during the maintenance procedure and the impact on the oven productivity and / or on the quality of the product at the exit of the oven is strongly limited.
• the burner assembly illustrated in FIG. 2 makes it possible to further limit the impact of a maintenance procedure or a change of fuel rods on the productivity of the oven and / or on the quality of the product at the outlet of the oven, especially in the case where the operator wishes or is obliged to carry out a long-term maintenance.
• the first flexible line 122 is closed and the first fuel rod 112 is off.
• the operator can, after step (c) above: (d) replace the first fuel rod 110 by a rod of the same fuel 112 previously connected at the first distributor 101 of said fuel, (e) restarting the cladding oxidant flow in the fuel rod passage 500, this time around the first fuel rod 112 by opening the primary oxidant line 510 by means of the valve 530, and
• the maintenance of the 110 rod can then be performed while the burner assembly operates in normal mode.
• FIG. 4 shows an alternative embodiment of a burner assembly according to the invention.
• the reserve fuel rod 310 is a rod specifically designed for the injection of said reserve fuel.
• each fuel rod 310 is also supplied with an atomizing fluid. It is therefore necessary to provide a flexible line 420 for this atomizing fluid with its associated valve 430.
• the operator opens the valve 430 before opening the valve 330 of the fuel oil, which is in this case the reserve fuel.
• the operator reduces, manually or by automata, the power of the fuel 1 while increasing the power of the fuel 2 to half the burner power, while respecting the instructions of flow of the atomizing fluid.
• the burner assembly then operates in the mixed mode with injection into the combustion zone on the one hand with a first fuel stream and on the other hand with a reserve fuel stream.
• the maintenance of the rod 110 can then be performed while the burner assembly is operating in the mixed mode with minimal impact on the productivity of the oven and / or the quality of the product at the exit of the oven.
• (1) opens the second flexible line 220 corresponding to this second fuel rod 210 by means of the valve 230 by regulating the flow of first and second fuel to the fuel rods 111 and 210 connected to the first and second open flexible lines 121 and 220 so as to achieve the desired power for the burner assembly.
• the burner assembly then operates (FIG. 5) in the mixed mode with injection into the combustion zone, on the one hand, of a first fuel stream and, on the other hand, of a second fuel stream.
• the burner assembly according to the invention makes it possible to pass from a first fuel to a second fuel, or even to a mixed regime of two fuels, without having to stop the burner assembly and without having to decrease the power of the burner assembly and with minimal impact on the productivity of the oven and / or the quality of the product at the exit of the oven.
• liquid fuel rods which can be first fuel rods, second fuel rods or reserve rods.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Materials Engineering (AREA)
• Organic Chemistry (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Feeding And Controlling Fuel (AREA)
• Combustion Of Fluid Fuel (AREA)
• Gas Burners (AREA)

Priority Applications (5)

Applications Claiming Priority (2)

Publications (2)

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ID=40042643

Family Applications (1)

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• 2008
  • 2008-07-02 EP EP08011920A patent/EP2141129A1/fr not_active Withdrawn
• 2009
  • 2009-07-01 CN CN2009801259773A patent/CN102083758A/zh active Pending
  • 2009-07-01 WO PCT/EP2009/058248 patent/WO2010000771A2/fr not_active Ceased
  • 2009-07-01 EP EP09772471.0A patent/EP2307324B1/fr not_active Not-in-force
  • 2009-07-01 US US13/000,793 patent/US20110195367A1/en not_active Abandoned
  • 2009-07-01 PL PL09772471T patent/PL2307324T3/pl unknown
  • 2009-07-01 JP JP2011515448A patent/JP5479467B2/ja not_active Expired - Fee Related
  • 2009-07-01 ES ES09772471.0T patent/ES2600809T3/es active Active

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