WO2017167454A1 - Procédé pour faire fonctionner un système de brûleur à régénération et système de brûleur à régénération - Google Patents

Procédé pour faire fonctionner un système de brûleur à régénération et système de brûleur à régénération Download PDF

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Publication number
WO2017167454A1
WO2017167454A1 PCT/EP2017/025047 EP2017025047W WO2017167454A1 WO 2017167454 A1 WO2017167454 A1 WO 2017167454A1 EP 2017025047 W EP2017025047 W EP 2017025047W WO 2017167454 A1 WO2017167454 A1 WO 2017167454A1
Authority
WO
WIPO (PCT)
Prior art keywords
combustion
regenerator
oxygen
operating mode
gas
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2017/025047
Other languages
German (de)
English (en)
Inventor
Siegfried Schemberg
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Linde GmbH
Original Assignee
Linde GmbH
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
Priority claimed from DE102016003930.2A external-priority patent/DE102016003930A1/de
Application filed by Linde GmbH filed Critical Linde GmbH
Publication of WO2017167454A1 publication Critical patent/WO2017167454A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/32—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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L15/00—Heating of air supplied for combustion
    • F23L15/02—Arrangements of regenerators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L7/00—Supplying non-combustible liquids or gases, other than air, to the fire, e.g. oxygen, steam
    • F23L7/007—Supplying oxygen or oxygen-enriched air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2206/00—Burners for specific applications
    • F23D2206/0021—Gas burners for use in furnaces of the reverberatory, muffle or crucible type
    • 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 invention relates to a method for operating a regenerative burner system with at least one burner having a regenerator with a
  • a heat storage body wherein the regenerator is operated alternately in a first and a second operating mode, wherein in the first operating mode, a fuel with a combustion support gas, which includes combustion air and which is at least partially supplied via the regenerator, is burned to obtain a combustion exhaust gas in a combustion chamber , and in the second mode of operation, the combustion exhaust gas is discharged from the combustion chamber via the regenerator.
  • a fuel with a combustion support gas which includes combustion air and which is at least partially supplied via the regenerator
  • a regenerative burner system for heating a combustion chamber with at least two burners, each having a fuel supply, a supply for a
  • regenerator having an inlet and an outlet and the supply of the combustion support gas opens into the regenerator and wherein a
  • Regenerative burner systems may include a number of regenerative burners that operate alternately in a first and a second mode of operation.
  • a first number of regenerative burners operated in the first operating mode combustion in a combustion chamber may be performed.
  • fuel can be burned with the supply of a combustion support gas in the combustion chamber.
  • a second number of regenerative burners operated in the second mode of operation in a first number of regenerative burners operated in the first operating mode, combustion in a combustion chamber may be performed.
  • fuel can be burned with the supply of a combustion support gas in the combustion chamber.
  • a second number of regenerative burners operated in the second mode of operation in a second number of regenerative burners operated in the second mode of operation
  • Each of the regenerative burners has a regenerator with a
  • Heat storage body on.
  • either the combustion support gas for combustion or the combustion exhaust gas can be discharged to the regenerator of the respective regenerative burner.
  • the combustion support gas is passed over the heat storage body, the heat storage body gives the stored heat to the
  • the fuel is usually supplied via one or more separate lines to the burner.
  • a so-called rinsing phase is usually carried out at the beginning of the first operating mode.
  • a residual amount of the combustion exhaust gas which is still in the regenerator after the second operating mode, is first removed therefrom.
  • the corresponding regenerator can be flushed with air, for example.
  • the corresponding regenerative burner can usually not be used for combustion. Only when the remainder of the
  • Combustion assist gas may also be continuously preheated in moving regenerator systems, the so-called rotary bed regenerators.
  • Moving regenerator systems continuously switch between heating and cooling.
  • combustion support gas can also be preheated by recuperatively installed directly in the burner heat exchange surfaces or externally mounted from the burner heat exchanger.
  • the time losses are to be reduced when switching between the operating modes of the burner and thus the performance of the furnace can be increased using the additionally introduced fuel energy.
  • a method for operating a fixed or movable regenerative burner system wherein the stationary system comprises at least two burners, and wherein the burners each comprise a regenerator with a heat storage body and are operated alternately in a first and a second operating mode, wherein in the first operating mode a fuel having a combustion assist gas including combustion air or oxygen-enriched combustion air at least partially supplied through the regenerator is burned to obtain a combustion exhaust gas in a combustion chamber, and in the second operation mode, the combustion exhaust gas is discharged from the combustion chamber via the regenerator.
  • the invention is characterized in that in the first Operating mode is used as combustion support gas with oxygen-enriched combustion air.
  • the regenerative burner system according to the invention is characterized in that an oxygen supply for supplying oxygen into the supply for the combustion support gas, in the flow connection between the outlet of the regenerator and the combustion chamber and / or in the combustion chamber is provided.
  • Regenerative burner system comprises at least one burner, wherein the burner comprises a regenerator with a heat storage body and is operated alternately in a first and a second operating mode, wherein in the first operating mode, a fuel with a combustion support gas comprising combustion air or oxygen-enriched combustion air and which at least is partially supplied via the regenerator, is burned to obtain a combustion exhaust gas in a combustion chamber, and in the second operating mode, the combustion exhaust gas is discharged via the regenerator from the combustion chamber.
  • the invention is characterized in that in the first
  • Operating mode is used as combustion support gas with oxygen-enriched combustion air.
  • the invention relates to a method for operating a fixed or movable regenerative burner system, wherein the regenerator or regenerators are operated alternately in a first and a second operating mode. Preferred scope of the invention are fixed
  • Combustion air or oxygen-enriched combustion air passed through the regenerator and with the heat storage body in direct
  • the heat accumulator body was previously heated (see second operating mode below). At the contact of
  • Combustion assist gas for example, at ambient temperature of e.g. 20 ° C enters the regenerator, the combustion support gas is preheated and in turn the heat storage body is cooled. The preheated combustion assist gas is then reacted with the fuel to heat the combustor chamber.
  • fuel for example, natural gas can be used.
  • a first number of these regenerative burners are operated in the first operating mode while at the same time a second number of these regenerative burners are operated in the second operating mode. After predetermined time intervals, a change of the operating modes is carried out in each case. After this change, the first number of regenerative burners is accordingly operated in the second operating mode, the second number in the first operating mode. Such a change of
  • the cycle time of these modes of operation is often short because, due to the dimensions, the capacity of the regenerators is limited and only a certain amount of heat can be stored in the heat storage body.
  • the burners must therefore be switched from the first to the second operating mode (or vice versa) at a time interval of about 30 seconds to 180 seconds.
  • air enriched with oxygen is used as combustion support gas instead of air. Due to the higher oxygen content in the combustion assist gas, a smaller total amount becomes
  • Combustion assist gas is required to provide the burner with the same amount of oxygen to provide. This means that the heat stored in the regenerator can be released over a longer period of time and the time between the two operating modes increases until the next changeover.
  • Combustion assist gas is required to provide the burner with the same amount of oxygen to provide. This means that the heat stored in the regenerator can be released over a longer period of time and the time between the two operating modes increases until the next changeover.
  • Combustion air stream upstream of entering the regenerator oxygen is fed and the combustion air enriched so with oxygen.
  • the oxygen-enriched combustion air stream is then passed through the regenerator and brought into contact with the hot heat storage body, wherein the oxygen-enriched combustion air stream is preheated and in turn cools the heat storage body.
  • an oxygen-enriched and preheated combustion assist gas is obtained.
  • the added amount of oxygen is miticaricart, which has an energetic positive effect.
  • the oxygen downstream of the regenerator is added to the combustion air.
  • the oxygen can be fed either in the burner in the combustion air stream or directly into the
  • the feeding or injection of oxygen into the combustion chamber is preferably carried out by means of an oxygen lance, wherein the oxygen is preferably supplied at a rate of at least 300 m / s via the oxygen lance.
  • the oxygen is partially downstream before entering the regenerator and partially upstream in the burner in the
  • Combustion air flow fed or injected into the combustion chamber.
  • the combustion air flow is preferably enriched with oxygen so far that the oxygen content in the resulting combustion assist gas is between 22% by volume and 35% by volume, preferably between 25% by volume and 30% by volume.
  • the advantages of the invention appear even at low oxygen levels.
  • the combustion air consists of about 79% by volume of nitrogen and about 21% by volume of oxygen. That is, with an addition of 5 vol% oxygen, the
  • Combustion air quantity can be reduced by 25% by volume, without changing the absolute amount of oxygen in the combustion support gas. Due to the higher relative oxygen content but the throughput of combustion air or Combustion assist gas is reduced by the regenerator so that the time between two switching operations can be increased. The burner operating time is thereby increased and the number of rinses reduced.
  • the oxygen-enriched gas is reduced by the regenerator so that the time between two switching operations can be increased. The burner operating time is thereby increased and the number of rinses reduced.
  • Total combustion air can also be increased and thus increased burner output with increased fuel supply.
  • the oxygen enrichment is preferably limited to a maximum of 35% by volume, more preferably to a maximum of 30% by volume.
  • the degree of enrichment actually reduces the flow velocity in the burners, which can lead to problems with flame formation and burner operation.
  • the reduced exhaust gas quantity and the regenerators can absorb less energy.
  • the invention primarily serves to extend the cycle times and increase performance in stationary regenerative burner systems, which must be frequently switched, especially in regenerative burner systems in which the burner at a time interval of 30 s to 300 s, preferably 30 s to 180 s, between the first operating mode and be switched to the second operating mode.
  • Each switching process takes 5-10 seconds or longer, depending on the system, and means a correspondingly long failure of the burner.
  • the invention therefore has a particularly advantageous effect.
  • the number of switching operations is reduced, thereby increasing the furnace output.
  • Preferred field of application of the invention are regenerative burner systems for heating an industrial furnace for melting or heating metal, in particular aluminum.
  • the invention is in principle of advantage for all regeneratively heated furnaces in which there are short time intervals of less than 5 minutes per operating mode, less than 3 minutes per operating mode or less than 2 minutes per operating mode.
  • the melting performance for example, a
  • Aluminum melting furnace can be significantly increased.
  • the burner operating times are extended and the switching frequency between the two operating modes is reduced.
  • the efficiency of air preheating also increases. Overall, so can a higher
  • Productivity can be achieved during melting or heating of metal.
  • Oxygen enrichment of the combustion air can eliminate carbonaceous deposits in the honeycomb cells of the regenerators.
  • FIG. 1 shows schematically a preferred embodiment of a fixed regenerative burner system according to the invention.
  • the regenerative burner system has two regenerative burners 110 and 120, which are arranged on a combustion chamber 101.
  • the regenerative burners 1 10 and 120 are each provided with a gas line for combustion support gas or
  • Combustion exhaust gas 1 1 1 and 121 connected.
  • heat storage bodies 1 14 and 124 are respectively arranged in the respective gas line 11 1 and 121, for example ceramic balls or honeycomb bodies.
  • each one designed here as a flap switching element 112 or 122 is arranged.
  • the gas lines 11 1 and 121 are each connected to a gas supply 130 and a gas discharge 140.
  • a first operating mode for example, air as
  • Combustion support gas 131 via the respective gas line 1 1 1 and 121, respectively.
  • the respective regenerative burner 1 10 or 120 is supplied via a separate fuel line or a separate fuel lance 170 and 180 in the first operating mode natural gas as fuel 132.
  • combustion of the mixture of natural gas 132 and, for example, air 131 in the combustion chamber 101 is performed by the respective regenerative burner 1 10 or 120.
  • a combustion exhaust gas 141 results in the combustion chamber 101.
  • This combustion exhaust gas 141 is discharged in the course of a second operating mode by the gas discharge 140 via the respective gas line 1 1 1 or 121 and thus also via the regenerators with the heat storage bodies 114 and 124 from the combustion chamber 101, when the flap 1 12 or 122 is switched to a second position.
  • the regenerative burner 110 is shown in the first operating mode and the regenerative burner 120 in the second operating mode.
  • the regenerative burner system 100 further includes an oxygen supply 160.
  • This oxygen supply 160 comprises two oxygen lances 161 and 162, which are arranged upstream of the regenerators 1 14 and 124, respectively. About these
  • Oxygen lances 161 and 162, respectively, an oxygen-rich additional gas can be fed.
  • pure oxygen with a purity of at least 99.5% is fed in as such oxygen-rich additional gas.
  • corresponding oxygen lances can also open directly into the combustion chamber 101, but in the immediate vicinity of the regenerative burner 1 10 or 120, or the oxygen is injected parallel to the fuel supply 132 via the burner 1 10 or 120 in the combustion chamber or it finds a Combination of the mentioned three injection variants application
  • the regenerative burner system 100 furthermore has a control unit 150, which is set up to carry out a preferred embodiment of a method according to the invention.
  • the regenerative burner 110 is operated in the first operating mode and the regenerative burner 120 in the second operating mode, as shown in FIG.
  • About the oxygen supply 160 and the oxygen lance 161 technically pure oxygen having a purity of more than 99% by volume of the combustion air 131 is mixed.
  • the resulting mixed gas stream has an oxygen content of 25% by volume to 30% by volume and is fed to the burner 110 via the regenerator and the heat storage body 14 as combustion support gas.
  • the mixed gas stream is heated to a temperature of, for example, 800 to 900 ° C.
  • the combustion assist gas and the natural gas 132 supplied as fuel to the burner 110 are combusted in the combustion chamber 101, and the resulting exhaust gas 141 is supplied through the heat storage body 124 of the regenerator associated with the second burner 120.
  • the combustion assist gas and the natural gas 132 supplied as fuel to the burner 110 are combusted in the combustion chamber 101, and the resulting exhaust gas 141 is supplied through the heat storage body 124 of the regenerator associated with the second burner 120.
  • Heat storage body 124 is heated.
  • Combustion support gas can not be sufficiently preheated.
  • the switching elements or flaps 1 12, 122 are switched so that the
  • Combustion air is now supplied to the burner 120 while the burner 120 and the associated lines are flushed, that is, the combustion exhaust gas is displaced from these lines.
  • the switching and rinsing phase which lasts for example between 5 and 10 seconds, both burners 1 10, 120 are not in operation.
  • the combustion air supplied to the burner 120 is mixed with oxygen via the lance 162, the mixture, as described above in connection with the burner 110, heated in the regenerator 124 and the burner 120 is ignited.
  • the burner 120 is now operated in the first operating mode while the burner 110 is operated in the second operating mode. It is also conceivable that the flushing time can be reduced by the injection of oxygen and the burner can be restarted faster.
  • the burner 1 10 with a capacity of 1 MW is operated with natural gas and combustion air.
  • the amount of combustion air is about 1000 NM 3 / h and the Combustion air is preheated in the regenerator 114 to about 950 ° C.
  • the temperature of the preheated combustion air drops to about 800 ° C.
  • the burner 110 is switched from the first operating mode to the second operating mode.
  • the burner 120 is switched from the second mode of operation to the first mode of operation.
  • the operating time of the burner 1 10 in the first operating mode should be 40 seconds. After switching, the burner 120 must be purged for 10 seconds before it can go into operation.
  • the burners 1 10, 120 are used for melting pure aluminum.
  • the melting capacity of the burners 110, 120 is about 1, 9 t / h.
  • the same burner 110 is supplied with oxygen-enriched combustion air instead of combustion air.
  • the amount of oxygen supplied is 50 Nm 3 / h.
  • the amount of combustion air is correspondingly reduced to 750 Nm 3 / h.
  • the burners 110, 120 is thus still supplied with the same absolute amount of oxygen of about 200 Nm 3 / h, but the amount of nitrogen decreases due to the
  • the oxygen-enriched combustion air is in turn preheated in the regenerator 1 14 to about 950 ° C.
  • the temperature of the preheated combustion air drops to about 825 ° C before switching to the other operating mode.
  • the operating time of the burner 1 10 is extended in the inventive driving to 50 seconds.
  • Melting power of the two burners 110, 120 increases to 2.1 t / h of aluminum.
  • the example shows that with an addition of 5% oxygen (50 Nm 3 / h additional oxygen relative to the original air quantity of 1000 Nm 3 / h) the
  • Melting power can be increased by about 10%. This is due to the longer burner operating time, the more efficient preheating of the combustion air or the oxygen-enriched combustion air and the lower Abgasbaten.
  • regenerator burner system explained in more detail, since the invention is particularly advantageous here. However, it is clear to the person skilled in the art that the method also contributes continuously operated or movable regenerators, for example

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Supply (AREA)

Abstract

La présente invention concerne un procédé pour faire fonctionner un système de brûleur à régénération (100) comprenant au moins un brûleur (120) qui comporte un régénérateur présentant un corps accumulateur de chaleur (114), ce régénérateur pouvant fonctionner alternativement dans un premier et un second mode de fonctionnement. Dans le premier mode de fonctionnement, un combustible est brûlé dans une chambre de combustion (101) avec un gaz favorisant la combustion, qui contient de l'air comburant et qui est acheminé au moins partiellement par l'intermédiaire du régénérateur, avec formation concomitante d'un gaz de combustion (141), et dans le second mode de fonctionnement le gaz de combustion est évacué de la chambre de combustion par l'intermédiaire du régénérateur. Selon l'invention, le gaz favorisant la combustion utilisé dans le premier mode de fonctionnement est de l'air comburant enrichi en oxygène.
PCT/EP2017/025047 2016-03-31 2017-03-13 Procédé pour faire fonctionner un système de brûleur à régénération et système de brûleur à régénération Ceased WO2017167454A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE102016003930.2A DE102016003930A1 (de) 2016-03-31 2016-03-31 Verfahren zum Betreiben eines Regenerativbrennersystems und Regenerativbrennersystem
DE102016003930.2 2016-03-31
EP16001483.3 2016-07-05
EP16001483 2016-07-05

Publications (1)

Publication Number Publication Date
WO2017167454A1 true WO2017167454A1 (fr) 2017-10-05

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Application Number Title Priority Date Filing Date
PCT/EP2017/025047 Ceased WO2017167454A1 (fr) 2016-03-31 2017-03-13 Procédé pour faire fonctionner un système de brûleur à régénération et système de brûleur à régénération

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WO (1) WO2017167454A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11264667A (ja) * 1998-03-18 1999-09-28 Toho Gas Co Ltd 回転式溶解炉用の蓄熱式バーナシステム
US6047565A (en) * 1996-07-11 2000-04-11 Saint Gobain Vitrage Method and device for reducing the NOx emission in a glass furnace
EP1058056A1 (fr) * 1999-06-01 2000-12-06 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Dispositif d'enrichissement en oxygène pour four à verre
EP2071236A2 (fr) * 2007-12-10 2009-06-17 Aga Ab Procédé pour brûleur et dispositif de brûleur

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6047565A (en) * 1996-07-11 2000-04-11 Saint Gobain Vitrage Method and device for reducing the NOx emission in a glass furnace
JPH11264667A (ja) * 1998-03-18 1999-09-28 Toho Gas Co Ltd 回転式溶解炉用の蓄熱式バーナシステム
EP1058056A1 (fr) * 1999-06-01 2000-12-06 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Dispositif d'enrichissement en oxygène pour four à verre
EP2071236A2 (fr) * 2007-12-10 2009-06-17 Aga Ab Procédé pour brûleur et dispositif de brûleur

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