EP3290793A1 - Lance d'injection permettant d'injecter un réactif réducteur liquide dans un gaz de combustion provenant de la combustion de combustible dans une chaudière ou un four afin de réduire la quantité d'oxydes d'azote dans les gaz de combustion - Google Patents

Lance d'injection permettant d'injecter un réactif réducteur liquide dans un gaz de combustion provenant de la combustion de combustible dans une chaudière ou un four afin de réduire la quantité d'oxydes d'azote dans les gaz de combustion Download PDF

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Publication number
EP3290793A1
EP3290793A1 EP16187213.0A EP16187213A EP3290793A1 EP 3290793 A1 EP3290793 A1 EP 3290793A1 EP 16187213 A EP16187213 A EP 16187213A EP 3290793 A1 EP3290793 A1 EP 3290793A1
Authority
EP
European Patent Office
Prior art keywords
injection lance
flue gas
boiler
furnace
injectors
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.)
Withdrawn
Application number
EP16187213.0A
Other languages
German (de)
English (en)
Inventor
Wolfgang Kurka
Werner Rungger
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.)
Yara International ASA
Original Assignee
Yara International ASA
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 Yara International ASA filed Critical Yara International ASA
Priority to EP16187213.0A priority Critical patent/EP3290793A1/fr
Priority to EP17768712.6A priority patent/EP3507545B1/fr
Priority to PCT/EP2017/072226 priority patent/WO2018042055A1/fr
Priority to PL17768712T priority patent/PL3507545T3/pl
Publication of EP3290793A1 publication Critical patent/EP3290793A1/fr
Withdrawn legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/003—Arrangements of devices for treating smoke or fumes for supplying chemicals to fumes, e.g. using injection devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2215/00—Preventing emissions
    • F23J2215/10—Nitrogen; Compounds thereof
    • F23J2215/101—Nitrous oxide (N2O)
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2219/00—Treatment devices
    • F23J2219/20—Non-catalytic reduction devices

Definitions

  • the present application relates to an injection lance for delivering a liquid reducing reagent into a flue gas of a boiler or furnace, thereby reducing the amount of nitrogen oxides (NO x ) present in said flue gas.
  • the major air pollutants emanating from boilers and furnaces are nitrogen oxides (NO x ), including nitric oxide (NO), nitrogen dioxide (NO 2 ) and nitrous oxide (N 2 O).
  • NO x nitrogen oxides
  • the total NO and NO 2 -concentration is typically referred to as NO x (nitrogen oxides).
  • Nitrogen oxides are mainly produced in the form of NO. Some NO 2 and N 2 O are also formed, but with lower concentrations.
  • These air pollutants are the subject of growing concern because these compounds are toxic and are the precursors to acid rain deposition as well as photochemical smog. Furthermore, nitrous oxide contributes to the greenhouse effect.
  • liquid reducing reagents directly into the flue gas in the combustion chamber can remove a significant proportion of NO x .
  • the liquid reducing reagent is typically an aqueous solution of urea or ammonia.
  • a superheater is a device used to convert saturated steam or wet steam into superheated steam or dry steam.
  • Water-cooled injector lances penetrating the combustion area of a boiler or furnace are quite common.
  • the main problem with this technology is that the wall temperature of the injector lance must be kept at temperatures over 150°C to avoid corrosion by the acid components in the flue gas.
  • condensate from the boiler or furnace cycle can be used, which is at a temperature below 100°C.
  • a heat exchanger for the condensate and the cooling water a pumping module for the cooling water as well for the condensate and a temperature control equipment are necessary. This system is thus costly and requires maintenance.
  • a process and apparatus for reducing the concentration of pollutants in an effluent from the combustion of a fuel is described.
  • the process and apparatus enable injection of an effluent treatment fluid at independently variable droplet sizes and distance of injection to a wide variety of distribution patterns within a flue gas passage.
  • An atomization conduit positioned coaxially around a treatment fluid conduit, extends into the effluent and supplies an atomization fluid.
  • the supply conduit is axially slidable with respect to the atomization conduit and supplying a treatment fluid through the supply conduit.
  • the relative axial position of the supply conduit and the atomization conduit is adjusted and the rate of flow of the atomization fluid is selected to inject droplets of a size effective to a desired distance within the passage.
  • the probe is provided with a cooling conduit disposed outside of and around a portion of the atomization conduit.
  • An appropriate cooling fluid such as air, water or steam, may be circulated or flowed through the cooling conduit to maintain the cooling of both the atomization and supply conduits in the high temperature environment of a boiler.
  • the purpose of the application is to provide an injector lance arranged for reducing the amount of NO x present in a flue gas of a burner or a furnace that can be installed in the combustion chamber in the right temperature window and having an improved NO x -reduction.
  • a first aspect of the present application provides in an injection lance for injecting a liquid reducing reagent into a flue gas from the combustion of fuel in a combustion chamber of a power boiler or furnace to reduce the amount of nitrogen oxides in the flue gas, wherein the injection lance comprises
  • the injection lance according to the application has the advantage that it improves the NOx-reduction by reducing the baseline and providing a better distribution due to the turbulence created by the injected air.
  • This injection lance is furthermore more cost efficient compared to the ones known in the state of the art.
  • the openings in the vicinity of the spraying nozzles enhance the mixing of the liquid reducing reagent with the flue gas.
  • the surrounding pipe furthermore helps significantly in the reduction of the temperature of the liquid reducing reagent. There is also no direct connection between the injectors and the surrounding pipe, due to different thermal expansion.
  • the first cooling means are arranged to cool the injectors with atomizing air that is used for atomizing the liquid reducing agent that is then sprayed by the respective spraying nozzles into the flue gas in the combustion chamber.
  • the atomizing air has a temperature of between 10°C and 60°C.
  • the atomizing air more specifically has a pressure of between 0,5 bar and 4 bar, and most specifically between 1 bar and 3 bar.
  • the second cooling means are arranged to cool the surrounding pipe with air having a temperature of between 10°C and 250°C.
  • the air used to cool the surrounding pipe more specifically has a pressure of between 0.01 bar and 0.5 bar.
  • each of the spraying nozzles has a droplet size and/or a spraying direction that are adjustable by changing the atomizing air pressure, the ratio of the atomizing air to the sprayed liquid reducing agent and/or the type of spraying nozzle.
  • An adjustable droplet size allows manipulation of the penetration distance of the droplet, i.e. the bigger the droplet, the longer the time until it is vaporized.
  • the injection lance comprises a flow control unit for continuously controlling the flow of the liquid reducing reagent towards each of the spraying nozzles.
  • the first and second cooling means are arranged to cool the injectors, respectively the surrounding pipe in case the spraying nozzles are not spraying liquid reducing agent into the flue gas.
  • each of the injectors is connected with the surrounding pipe in the vicinity of their respective spraying nozzles.
  • each of the injectors would expand, possibly in a different way, then each of the injectors are able of move within the surrounding pipe, but their spraying nozzle situated at the end of the injectors will remain in the correct position where the respective openings in the surround pipe are provided.
  • the surrounding pipe is made out of a material that is resistant against a temperature of up to 1100°C.
  • a boiler or furnace having a combustion chamber comprising a roof and an injection lance according to the application as described above which is hanging essentially vertically from the roof of the combustion chamber.
  • a boiler or furnace is provided with a combustion chamber comprising a substantially vertical wall and an injection lance according to the application as described above which is arranged in an essentially horizontal position attached to the substantially vertical wall, wherein between the injectors and the surrounding pipe, a supporting beam is arranged to maintain the injectors centrally disposed within the surrounding pipe.
  • the boiler or furnace is provided with one or more connections external to the combustion chamber for receiving the atomizing and ambient air and the liquid reducing reagent.
  • the injector lance has a certain penetration depth in the combustion chamber of the boiler or furnace, and the boiler or furnace is arranged with an adaptation mechanism to change the penetration depth of the injector lance.
  • the lance is completely inserted into the combustion chamber, while for higher load, the injection needs to be done further up in the combustion chamber and therefore the injection lance is partially lifted.
  • the present application relates to a method for reducing the amount of nitrogen oxides (NO x ) present in flue gas provided from the combustion of fuel in a boiler or furnace, said method comprises the step of adding to said flue gas a liquid reducing reagent such as an aqueous urea or ammonia solution using an injection lance as described herein.
  • a liquid reducing reagent such as an aqueous urea or ammonia solution using an injection lance as described herein.
  • the present application relates to the use of injection lance as described herein for injecting a liquid reducing reagent such as an aqueous urea or ammonia solution to in combustion chamber thereby reducing the amount of nitrogen oxides (NO x ) present in flue gas provided from the combustion of fuel in a boiler or furnace.
  • a liquid reducing reagent such as an aqueous urea or ammonia solution
  • FIG. 1 shows a top view of an exemplary embodiment of an injection lance according to the application.
  • An injection lance (1) is arranged for injecting a liquid reducing reagent, more specific an aqueous urea or ammonia solution, into a flue gas produced by the combustion of fuel in a combustion chamber of boiler, for instance a power boiler, or a furnace in order to reduce the amount of NO x in the flue gas.
  • the injection lance (1) comprises a surrounding pipe (2) made out of high temperature resistant steel, more in particular resistant against temperatures up to 1100°C. This surrounding pipe (2) is coaxial with and disposed around at least two oblong separate injectors (3) that at the end thereof each have a single spraying nozzle (4) (see FIG.
  • each of the spraying nozzles (4) can have a droplet size and/or a spraying direction that are adjustable by changing the pressure of the atomizing air, the ratio of the atomizing air to the sprayed liquid reducing agent and/or the type of spraying nozzle.
  • the spraying direction can be made adjustable more specifically by changing the type of spraying nozzle and the position thereof within the injection lance (1).
  • the injection lance (1) can comprise a flow control unit for continuously controlling the flow of the liquid reducing reagent towards each of the spraying nozzles (4).
  • the exemplary embodiment as shown in FIG. 1 is provided with three oblong injectors (3) extending into the surrounding pipe (2) and each having a different length.
  • Each of the injectors (3) can be fixed with the surrounding pipe (2) in the vicinity of each of their spraying nozzles (4).
  • the injection lance (1) furthermore comprises first cooling means to cool the injectors with air.
  • the air that is used to cool the injectors (3) is more specifically the atomizing air that is used to atomize the liquid reducing agent or in other words to reduce the liquid reducing agent to a fine spray in each of the injectors (3).
  • the atomizing air more specifically has an inlet temperature of between 10°C and 60°C and has a pressure of between 0,5 and 4 bar, and more in particular a pressure of between 1 and 3 bar. It is remarked that further in the injection lance (1), the temperature can be higher.
  • the injection lance (1) furthermore comprises second cooling means that are arranged to cool the surrounding pipe (2) with air having a temperature of between 10°C and 250°C.
  • the air to cool the surrounding pipe (2) more specifically has a pressure of between 0.01 and 0.5 bar.
  • This air can be obtained from any air source having the right temperature and pressure.
  • This air can for instance be produced by an air blower which injects air at the beginning of the surrounding pipe (2). It can however also be cold combustion air. Furthermore, it can also be air that is coming from ammonia stripping of the ash produced in the combustion chamber. During transport of fly ash together with the flue gas, ammonia is adsorbed on the fly ash. Since the fly ash is however sold, the amount of ammonia that is allowable is limited.
  • the first cooling means respectively the second cooling means can be provided to cool the injectors (3) with atomizing air, respectively the surrounding pipe (2) with air, even when the injectors (3) are not spraying liquid reducing agent into the flue gas.
  • connections can be provided for
  • the injection lance (1) can be installed in an essentially horizontal as well as in an essentially vertical way in the combustion chamber.
  • the injection lance (1) more specifically hangs from the roof of the combustion chamber of the boiler or the furnace.
  • the injection lance (1) more specifically is provided with a supporting beam (not shown on the figures) between the injectors (3) and the surrounding pipe (2) to keep the injectors centrally disposed within the surrounding pipe (2).
  • the injection lance (1) optionally can be provided movable within the combustion chamber, for instance by providing a hoist fixed at the roof of the combustion chamber or a retractable support for a horizontally positioned injection lance (1).
  • the injection lance (1) has a certain penetration depth in the combustion chamber of the boiler or the furnace which can be adapted by means of an adaptation mechanism, for instance a compression seal fitting (gland) (not shown on the FIGs) that is located where the injectors (3) penetrate the blind flange (9) (see FIG. 1 ) and that secures the injectors (3) to the blind flange (9).
  • a compression seal fitting (gland) (not shown on the FIGs) that is located where the injectors (3) penetrate the blind flange (9) (see FIG. 1 ) and that secures the injectors (3) to the blind flange (9).

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Nozzles (AREA)
  • Treating Waste Gases (AREA)
  • Chimneys And Flues (AREA)
EP16187213.0A 2016-09-05 2016-09-05 Lance d'injection permettant d'injecter un réactif réducteur liquide dans un gaz de combustion provenant de la combustion de combustible dans une chaudière ou un four afin de réduire la quantité d'oxydes d'azote dans les gaz de combustion Withdrawn EP3290793A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP16187213.0A EP3290793A1 (fr) 2016-09-05 2016-09-05 Lance d'injection permettant d'injecter un réactif réducteur liquide dans un gaz de combustion provenant de la combustion de combustible dans une chaudière ou un four afin de réduire la quantité d'oxydes d'azote dans les gaz de combustion
EP17768712.6A EP3507545B1 (fr) 2016-09-05 2017-09-05 Lance d'injection permettant d'injecter un réactif réducteur liquide dans un gaz de combustion provenant de la combustion de combustible dans une chaudière ou un four afin de réduire la quantité d'oxydes d'azote dans les gaz de combustion
PCT/EP2017/072226 WO2018042055A1 (fr) 2016-09-05 2017-09-05 Lance d'injection permettant d'injecter un réactif réducteur liquide dans un gaz de combustion provenant de la combustion de combustible dans une chaudière ou un four pour réduire la quantité d'oxydes d'azote dans le gaz de combustion
PL17768712T PL3507545T3 (pl) 2016-09-05 2017-09-05 Lanca wtryskowa do wtryskiwania ciekłego odczynnika redukującego do spalin pochodzących ze spalania paliwa w kotle lub piecu w celu zredukowania ilości tlenków azotu w spalinach

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP16187213.0A EP3290793A1 (fr) 2016-09-05 2016-09-05 Lance d'injection permettant d'injecter un réactif réducteur liquide dans un gaz de combustion provenant de la combustion de combustible dans une chaudière ou un four afin de réduire la quantité d'oxydes d'azote dans les gaz de combustion

Publications (1)

Publication Number Publication Date
EP3290793A1 true EP3290793A1 (fr) 2018-03-07

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Application Number Title Priority Date Filing Date
EP16187213.0A Withdrawn EP3290793A1 (fr) 2016-09-05 2016-09-05 Lance d'injection permettant d'injecter un réactif réducteur liquide dans un gaz de combustion provenant de la combustion de combustible dans une chaudière ou un four afin de réduire la quantité d'oxydes d'azote dans les gaz de combustion
EP17768712.6A Active EP3507545B1 (fr) 2016-09-05 2017-09-05 Lance d'injection permettant d'injecter un réactif réducteur liquide dans un gaz de combustion provenant de la combustion de combustible dans une chaudière ou un four afin de réduire la quantité d'oxydes d'azote dans les gaz de combustion

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP17768712.6A Active EP3507545B1 (fr) 2016-09-05 2017-09-05 Lance d'injection permettant d'injecter un réactif réducteur liquide dans un gaz de combustion provenant de la combustion de combustible dans une chaudière ou un four afin de réduire la quantité d'oxydes d'azote dans les gaz de combustion

Country Status (3)

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EP (2) EP3290793A1 (fr)
PL (1) PL3507545T3 (fr)
WO (1) WO2018042055A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109173667A (zh) * 2018-09-25 2019-01-11 内蒙古弘睿节能科技有限公司 一种全自动三级脱硫除尘装置

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019178137A1 (fr) * 2018-03-14 2019-09-19 Midwest Energy Emissions Corp Système d'injection d'halogénure
CN110860200A (zh) * 2018-08-28 2020-03-06 艾克赛尔能源科技江苏有限公司 一种高效冷却喷射器
CN112403265A (zh) * 2020-11-21 2021-02-26 西安热工研究院有限公司 一种风幕保护l型尿素溶液喷枪
CN118416681B (zh) * 2024-07-05 2024-10-29 佛山仙湖实验室 一种高效sncr脱硝喷枪、系统及使用方法

Citations (5)

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Publication number Priority date Publication date Assignee Title
WO1988005762A1 (fr) 1987-02-02 1988-08-11 Fuel Tech, Inc. Procede et installation de reduction de la concentration de polluants dans un effluent
US20050013755A1 (en) * 2003-06-13 2005-01-20 Higgins Brian S. Combustion furnace humidification devices, systems & methods
US20100068111A1 (en) * 2008-08-12 2010-03-18 Walsh Jr William Arthur Joining the mixing and variable gas atomizing of reactive chemicals in flue gas cleaning systems for removal of sulfur oxides, nitrogen oxides and mercury
US20120042970A1 (en) * 2010-08-17 2012-02-23 Klages Steven S Device and method for supplying a sorbent
WO2013055285A1 (fr) * 2011-10-12 2013-04-18 Ecomb Ab (Publ) Dispositif d'alimentation de chambre de combustion et procédé associé

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Publication number Priority date Publication date Assignee Title
US3918639A (en) * 1974-09-19 1975-11-11 Coen Co Oil atomizer

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988005762A1 (fr) 1987-02-02 1988-08-11 Fuel Tech, Inc. Procede et installation de reduction de la concentration de polluants dans un effluent
US20050013755A1 (en) * 2003-06-13 2005-01-20 Higgins Brian S. Combustion furnace humidification devices, systems & methods
US20100068111A1 (en) * 2008-08-12 2010-03-18 Walsh Jr William Arthur Joining the mixing and variable gas atomizing of reactive chemicals in flue gas cleaning systems for removal of sulfur oxides, nitrogen oxides and mercury
US20120042970A1 (en) * 2010-08-17 2012-02-23 Klages Steven S Device and method for supplying a sorbent
WO2013055285A1 (fr) * 2011-10-12 2013-04-18 Ecomb Ab (Publ) Dispositif d'alimentation de chambre de combustion et procédé associé

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109173667A (zh) * 2018-09-25 2019-01-11 内蒙古弘睿节能科技有限公司 一种全自动三级脱硫除尘装置
CN109173667B (zh) * 2018-09-25 2023-10-13 内蒙古弘睿节能科技有限公司 一种全自动三级脱硫除尘装置

Also Published As

Publication number Publication date
WO2018042055A1 (fr) 2018-03-08
EP3507545B1 (fr) 2020-04-08
EP3507545A1 (fr) 2019-07-10
PL3507545T3 (pl) 2020-09-21

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