WO2015051136A1 - Isolation électrique et thermique pour système de combustion - Google Patents

Isolation électrique et thermique pour système de combustion Download PDF

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Publication number
WO2015051136A1
WO2015051136A1 PCT/US2014/058853 US2014058853W WO2015051136A1 WO 2015051136 A1 WO2015051136 A1 WO 2015051136A1 US 2014058853 W US2014058853 W US 2014058853W WO 2015051136 A1 WO2015051136 A1 WO 2015051136A1
Authority
WO
WIPO (PCT)
Prior art keywords
combustor
wall
thermal insulator
conductive
insulator
Prior art date
Application number
PCT/US2014/058853
Other languages
English (en)
Inventor
David F. CHERPESKE
Igor A. Krichtafovitch
Douglas W. KARKOW
Joseph Colannino
Jesse DUMAS
Original Assignee
Clearsign Combustion Corporation
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 Clearsign Combustion Corporation filed Critical Clearsign Combustion Corporation
Publication of WO2015051136A1 publication Critical patent/WO2015051136A1/fr
Priority to US15/090,241 priority Critical patent/US20160290633A1/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C99/00—Subject-matter not provided for in other groups of this subclass
    • F23C99/001—Applying electric means or magnetism to combustion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
    • F23M5/00—Casings; Linings; Walls
    • F23M5/08—Cooling thereof; Tube walls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
    • F23M5/00—Casings; Linings; Walls
    • F23M5/08—Cooling thereof; Tube walls
    • F23M5/085—Cooling thereof; Tube walls using air or other gas as the cooling medium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
    • F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
    • F23R3/002—Wall structures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
    • F23M2900/00—Special features of, or arrangements for combustion chambers
    • F23M2900/05004—Special materials for walls or lining

Definitions

  • One embodiment is a combustor wall that includes a conductive wall defining an exterior surface, a thermal insulator defining an interior surface configured to lie adjacent to a combustion volume configured to be heated to an elevated temperature and to carry charged particles, and an electrical insulator disposed between the conductive wall and the thermal insulator.
  • the thermal insulator is configured to thermally insulate the electrical insulator from the combustion volume.
  • the electrical insulator is configured to electrically insulate the conductive wall from the thermal insulator and the combustion volume.
  • an electrically floating conductive foil is positioned between two layers of the thermal insulator material so as to redistribute any charge that finds its way past the first thermally insulating layer.
  • a combustor includes a furnace wall defining a combustion chamber configured to enclose a combustion reaction, a power supply configured to output a high voltage, and a charger operatively coupled to the power supply and to the combustion chamber.
  • the charger is configured to receive the high voltage from the power supply and to cause the combustion reaction to carry a majority charge.
  • the furnace wall includes a conductive wall, a thermal insulator adjacent to the combustion chamber, and an electrical insulator disposed between the thermal insulator and the conductive wall.
  • the thermal insulator is configured to thermally insulate the electrical insulator from the combustion volume.
  • the electrical insulator is configured to electrically insulate the conductive wall from the thermal insulator and the combustion volume.
  • FIG. 1 is a sectional diagram of a combustor wall, according to an embodiment.
  • FIG. 2 is a sectional diagram of a combustor wall, according to another embodiment.
  • FIG. 3 is a diagram of a combustor, according to an embodiment.
  • FIG. 4 is a diagram of a combustor, according to another embodiment.
  • FIG. 5 is a flow diagram of a process for operating a combustor, according to one embodiment.
  • FIG. 1 is a sectional diagram of a combustor wall 100, according to an embodiment.
  • the combustor wall 100 includes a conductive wall 102 defining an exterior surface 104 configured to lie adjacent to an outer volume 106 and configured to provide tensile strength to the combustor wall 100.
  • a thermal insulator 108 defining an interior surface 1 10 is configured to lie adjacent to a combustion volume 1 12.
  • the combustion volume 1 12 is configured to be heated to an elevated temperature and to carry charged particles 1 14.
  • An electrical insulator 1 16 is disposed between the conductive wall 102 and the thermal insulator 108.
  • the thermal insulator 108 is configured to thermally insulate the electrical insulator 1 16 from the combustion volume 1 12.
  • the electrical insulator 1 16 is configured to electrically insulate the conductive wall 102 from the thermal insulator 108 and the combustion volume 1 12.
  • the outer volume 106 adjacent to the exterior surface 104 of the conductive wall 102 can be atmospheric and/or a water jacket, for example.
  • the conductive wall 102 can be steel or iron and can be electrically grounded.
  • the electrical insulator 1 16 is contemplated to include several alternative materials.
  • the electrical insulator 1 16 was steatite, also referred to as soapstone.
  • Steatite has a relatively low electrical conductivity that is persistent to relatively high temperatures. Low electrical conductivity at high temperatures can be leveraged to reduce the thickness of the thermal insulating layer 108.
  • Thermal insulating properties of the electrical insulator 1 16 can similarly be leveraged to reduce the thickness of the thermal insulator 108.
  • other electrical insulator materials and structures may be used.
  • some electrically insulating materials may be selected for a relatively high dielectric constant (at least at a modulation frequency of the charged particles 1 14), a melting point or glass transition temperature high enough to avoid degradation, and/or a coefficient of thermal expansion that is relatively well-matched to that of the material in the wall 102 and/or the thermal insulator 108.
  • the electrical insulator 1 16 may include one or more of polyether-ether-ketone, polyimide, silicon dioxide, silica glass, alumina, silicon, titanium dioxide, strontium titanate, barium strontium titanate, or barium titanate.
  • More electrically conductive (poorer electrically insulating) material options may be most appropriate for the electrical insulator 1 16 for embodiments using lower voltages, greater electrical insulator 1 16 thicknesses, and/or greater thermal insulator 108 thicknesses.
  • the thermal insulator 108 can be a ceramic fiber, a refractory fiber, and/or a refractory ceramic fiber.
  • the thermal insulator 108 can be a vitreous aluminosilicate fiber.
  • the thermal insulator 108 can be heat treated to remove ("burn off') the binders.
  • the thermal insulator 108 can additionally or alternatively include cordierite (magnesium iron aluminum cyclosilicate), Mullite (a silicate mineral including AI2O3 and S1O2, as 2AI2O3S1O2 or 3AI2O32S1O2.), alumina, and/or an aerogel.
  • the thermal insulator 108 can be formed as a honeycomb material or having another structure including air gap thermally insulating features.
  • FIG. 2 is a sectional diagram of a combustor wall 200, according to another embodiment.
  • the thermal insulator 108 can include quiescent air channels 202.
  • the thermal insulator 108 can be selected to be electrically conductive at elevated temperatures. At least a portion of the thermal insulator 108 can be configured to act as an electrode at elevated temperatures.
  • FIG. 3 is a diagram of a combustor 300, according to an embodiment.
  • the combustor 300 includes a furnace wall 302 defining the combustion volume 1 12 configured to enclose a combustion reaction 304.
  • a power supply 306 is configured to output a high voltage.
  • a charger 308 is operatively coupled to the power supply 306 and to the combustion volume 1 12 and configured to receive the high voltage from the power supply 306 and to cause the combustion reaction 304 to carry a majority charge.
  • the furnace wall 302 includes the conductive wall 102 adjacent to an outside volume 106, the thermal insulator 108 adjacent to the combustion volume 1 12, and the electrical insulator 1 16 disposed between the thermal insulator 108 and the conductive wall 102.
  • the conductive wall 102 can define a water jacket.
  • the conductive wall 102 can include steel and/or iron.
  • the electrical insulator 1 16 can include steatite or another material having suitable properties.
  • the electrical insulator 1 16 can be configured as a plurality of continuous planes respectively held by gravity adjacent to the conductive wall 102. Additionally or alternatively, the electrical insulator 1 16 can be configured as a plurality of tiles. Air gaps between adjacent tiles may provide electrical insulation and reduce the need for close fitting of the tiles.
  • the tiles may be separated from one another by up to 0.25 inch in some installations. In other installations, the tiles are installed within 0.125 inch of one another. In some installations, the tiles are installed within 0.0625 of one another.
  • the electrical insulator 1 16 can include two or more layers of insulating tiles ⁇ e.g., soapstone tiles). Tiles in respective layers can be offset from one another to minimize or eliminate any single gap penetrating the entire thickness of the electrical insulator 1 16 (e.g., a two-layer field of electrically insulating tiles can include tiles centered on every three- or four-corner abutting location on an underlying layer of electrically insulating tiles.
  • the electrical insulator 1 16 can be adhered to the conductive wall 102 and/or to adjoining electrical insulator layers by adhesive.
  • the electrical insulator 1 16 can be affixed to the conductive wall 102, other layers of the electrical insulator 1 16, and/or to the thermal insulator 108 by a cementitious material that acts an adhesive.
  • the electrical insulator 1 16 can be affixed to the conductive wall 102, other layers of the electrical insulator 1 16, and/or to the thermal insulator 108 by an adhesive material.
  • the electrical insulator 1 16 can be affixed to the conductive wall 102, other layers of the electrical insulator 1 16, and/or to the thermal insulator 108 by nonconductive hardware.
  • alumina screws or posts can mechanically adjoin the electrical insulator 1 16 to the conductive wall 102, other layers of the electrical insulator 1 16, and/or to the thermal insulator 108.
  • the thermal insulator 108 can include a ceramic fiber, a refractory fiber, and/or a refractory ceramic fiber, according to embodiments.
  • the thermal insulator 108 can be held adjacent to the electrical insulator 1 16 by gravity.
  • the thermal insulator 108 can be adhered to the electrical insulator 1 16 by an adhesive and/or by substantially non-conducting fasteners.
  • the thermal insulator 108 can include a vitreous aluminosilicate fiber.
  • the thermal insulator 108 can be heat treated to remove binders.
  • the thermal insulator 108 can additionally or alternatively include cordierite, Mullite, alumina, and/or an aerogel.
  • the thermal insulator 108 can be formed as a honeycomb or porous material.
  • the thermal insulator 108 can be configured, under steady-state conditions, to thermally insulate the electrical insulator 1 16 sufficiently to maintain at least a 700 °F difference between the combustion volume 1 12 and the electrical insulator 1 16. In some embodiments, the thermal insulator 108 may be configured to maintain a 1700 °F difference (steady-state) between the combustion volume 1 12 and the electrical insulator 1 16.
  • the electrical insulator is configured to inhibit leakage current between the charger 308 and outer wall 102 at elevated temperatures.
  • the electrical insulator is configured to allow a maximum voltage drop across the electrical insulator 1 16 corresponding to 5% of the voltage between the outer wall 102 and the charger 308. Thus, if 40kV are applied between the charger 308 and the outer wall 102, then a voltage drop of 2kV is permitted across the electrical insulator 1 16.
  • the electrical insulator 1 16 maintains at least 10 megaohms resistance between the combustion volume 1 12 and the furnace wall 302. In another embodiment, the electrical insulator 1 16 can maintain at least 100 megaohms of resistance to a grounded furnace wall 102.
  • the conductive wall 102 can be held at an electrical ground such as earth ground.
  • the power supply 306 can be configured to output a high voltage greater than 1000V magnitude. In another embodiment, the power supply 306 can be configured to output a high voltage equal to or greater than 15kV in magnitude. The power supply 306 can be configured to output a DC voltage and/or output an AC voltage.
  • the combustor 300 can be a solid fuel 310 burner.
  • the charger 308 can be configured to output an AC high voltage to the combustion reaction 304.
  • the combustor 300 can include a conductive grate 312 configured to act as a counter electrode to the charger 308.
  • the conductive grate 312 can be galvanically isolated.
  • FIG. 4 is a diagram of a combustor 400, according to another
  • the combustor 300 can be a gas burner 400.
  • the combustor 400 can include an electrically grounded fuel nozzle 402.
  • the combustor 400 can include a second power supply voltage lead 404 configured to carry a voltage.
  • a region 406 of the thermal insulator 108 can be operatively coupled to the second power supply voltage lead 404.
  • the thermal insulator 108 can become electrically conductive at elevated temperatures responsive to heating by the combustion reaction 304. At least the region 406 of the thermal insulator 108 can be configured to operate as an electrode upon being heated by the combustion reaction 304.
  • the second power supply voltage lead 404 can pass through an aperture 408 defined by the conductive wall 102.
  • FIG. 5 is a flow diagram of a process 500 for operating a combustor, according to one embodiment.
  • a combustion reaction is initiated in a combustion chamber of a combustor.
  • a wall of the combustion chamber includes an outer conductive layer, an inner thermal insulation layer, and an intermediate electrical insulation layer positioned between the outer conductive layer and the thermal insulation layer.
  • the conductive outer layer is coupled to a power supply.
  • a charger electrode may be positioned within the combustion chamber and is coupled to the power supply.
  • a charged particle emission electrode may be positioned within the combustion chamber or may be positioned within a gas stream that enters the combustion chamber, such as a combustion air stream, a flue gas recirculation stream, or a gaseous fuel stream.
  • the combustion chamber may be at least partly tribo- electrically charged, such as by contact-generated charges carried into the combustion chamber by fuel particles.
  • the thermal insulation layer thermally insulates the electrical insulation layer and the conductive outer wall such that the temperature of the electrical insulation layer is significantly lower than the temperature within the combustion chamber.
  • a ground voltage is applied to the conductive outer layer of the wall of the combustion chamber.
  • a voltage other than ground may be applied to the conductive outer layer of the wall of the combustion chamber.
  • the conductive outer layer may be held at ground by virtue of its continuity with an external environment and/or via a grounded conductor.
  • a high voltage is applied to the charger within the combustion chamber.
  • gases undergoing the combustion reaction are ionized such that a flame within the combustion chamber carries a majority charge.
  • the characteristics of the combustion reaction within the combustion chamber can be controlled to have selected characteristics.
  • the high-voltage applied to the charger is between 1000V and 15,000V.
  • the high- voltage can be higher than 15,000V.
  • the voltage applied to the charger can be an AC voltage, a DC voltage, or any suitable waveform to obtain selected characteristics of the combustion reaction within the combustion chamber.
  • the thermal insulation layer becomes electrically conductive.
  • a portion of the thermal insulation layer can be used as an electrode for further controlling characteristics of the combustion reaction within the combustion chamber.
  • the process 500 comprises applying ground voltage or a third voltage to the portion of the thermal insulation layer used as an electrode. The voltage can be applied to thermal insulation layer by passing a conductor through an aperture in the conductive outer layer and the electrical insulation layer to the thermal insulation layer.
  • the process 500 includes cooling the outer conductive layer of the wall of the combustion chamber by passing water along the outside of the conductive layer of the combustion chamber wall.
  • a water jacket configuration contains the water as it is passed along the outer conductive layer of the wall of the combustion chamber. The water jacket is thermally coupled to the outer conductive layer of the combustion chamber wall such that the water cools the outer conductive layer of the combustion chamber wall.
  • the water jacket may act as at least a portion of a thermal load that is heated by the combustion reaction.
  • a conductor is positioned adjacent a bottom portion of the combustion chamber. Therefore, in one embodiment the process 500 includes applying a voltage to the conductor near the bottom of the combustion chamber. In this case, the conductor near the bottom of the combustion chamber acts as a counter electrode to the charger.
  • the conductor at the bottom of the combustion chamber can be connected to ground or can carry any other suitable voltage to influence the combustion reaction. Alternatively, the conductor at the bottom of the combustion chamber can be connected to a voltage through an electrically resistive material.
  • the combustor burns liquid or gaseous fuel.
  • the conductor near the bottom of the electrode can be a conductive fuel nozzle from which fuel is output into the combustion chamber.
  • the conductor near the bottom of the electrode can be a conductive fuel nozzle from which fuel is output into the combustion chamber.
  • the conductor near the bottom of the electrode can be a solid fuel, the conductor near the bottom of the
  • combustion chamber can be a conductive grid or mesh on which the solid fuel is disposed during combustion and/or during preheating awaiting combustion.
  • steps of the process 500 have been described as occurring in a particular order, the steps of the process 500 can be performed in different orders then shown in FIG. 5 and described in the foregoing description.
  • the voltages can be applied to the conductive outer layer and the charger prior to initiation of the combustion reaction, or simultaneous with the initiation of the combustion reaction.
  • Those skilled in the art will understand, in light of the present disclosure, that many other process steps and orders of performing the process steps are possible in accordance with principles of the present disclosure. All such other orders and process steps fall within the scope of the present disclosure.

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

Abstract

Selon l'invention, une chambre de combustion améliorée électriquement comprend une isolation bicouche. Un isolant thermique protège un isolant électrique de températures élevées qui pourraient rendre l'isolant électrique au moins quelque peu électroconductrice.
PCT/US2014/058853 2013-10-02 2014-10-02 Isolation électrique et thermique pour système de combustion WO2015051136A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US15/090,241 US20160290633A1 (en) 2013-10-02 2016-04-04 Electrical and thermal insulation for a combustion system

Applications Claiming Priority (2)

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US201361885809P 2013-10-02 2013-10-02
US61/885,809 2013-10-02

Related Child Applications (1)

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US15/090,241 Continuation US20160290633A1 (en) 2013-10-02 2016-04-04 Electrical and thermal insulation for a combustion system

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WO2015051136A1 true WO2015051136A1 (fr) 2015-04-09

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US9371994B2 (en) 2013-03-08 2016-06-21 Clearsign Combustion Corporation Method for Electrically-driven classification of combustion particles
US9441834B2 (en) 2012-12-28 2016-09-13 Clearsign Combustion Corporation Wirelessly powered electrodynamic combustion control system
US9494317B2 (en) 2012-09-10 2016-11-15 Clearsign Combustion Corporation Electrodynamic combustion control with current limiting electrical element
US9496688B2 (en) 2012-11-27 2016-11-15 Clearsign Combustion Corporation Precombustion ionization
US9513006B2 (en) 2012-11-27 2016-12-06 Clearsign Combustion Corporation Electrodynamic burner with a flame ionizer
US9664386B2 (en) 2013-03-05 2017-05-30 Clearsign Combustion Corporation Dynamic flame control
US9702547B2 (en) 2014-10-15 2017-07-11 Clearsign Combustion Corporation Current gated electrode for applying an electric field to a flame
US9803855B2 (en) 2013-02-14 2017-10-31 Clearsign Combustion Corporation Selectable dilution low NOx burner
US10006715B2 (en) 2015-02-17 2018-06-26 Clearsign Combustion Corporation Tunnel burner including a perforated flame holder
US10066835B2 (en) 2013-11-08 2018-09-04 Clearsign Combustion Corporation Combustion system with flame location actuation
US10077899B2 (en) 2013-02-14 2018-09-18 Clearsign Combustion Corporation Startup method and mechanism for a burner having a perforated flame holder
US10125979B2 (en) 2013-05-10 2018-11-13 Clearsign Combustion Corporation Combustion system and method for electrically assisted start-up
US10190767B2 (en) 2013-03-27 2019-01-29 Clearsign Combustion Corporation Electrically controlled combustion fluid flow
US10295185B2 (en) 2013-10-14 2019-05-21 Clearsign Combustion Corporation Flame visualization control for electrodynamic combustion control
US10359213B2 (en) 2013-02-14 2019-07-23 Clearsign Combustion Corporation Method for low NOx fire tube boiler
US10364980B2 (en) 2013-09-23 2019-07-30 Clearsign Combustion Corporation Control of combustion reaction physical extent
US10386062B2 (en) 2013-02-14 2019-08-20 Clearsign Combustion Corporation Method for operating a combustion system including a perforated flame holder
US10458647B2 (en) 2014-08-15 2019-10-29 Clearsign Combustion Corporation Adaptor for providing electrical combustion control to a burner
US10571124B2 (en) 2013-02-14 2020-02-25 Clearsign Combustion Corporation Selectable dilution low NOx burner
US10808927B2 (en) 2013-10-07 2020-10-20 Clearsign Technologies Corporation Pre-mixed fuel burner with perforated flame holder
US10823401B2 (en) 2013-02-14 2020-11-03 Clearsign Technologies Corporation Burner system including a non-planar perforated flame holder
US11460188B2 (en) 2013-02-14 2022-10-04 Clearsign Technologies Corporation Ultra low emissions firetube boiler burner

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US9696031B2 (en) 2012-03-27 2017-07-04 Clearsign Combustion Corporation System and method for combustion of multiple fuels
US10060619B2 (en) 2012-12-26 2018-08-28 Clearsign Combustion Corporation Combustion system with a grid switching electrode
US10364984B2 (en) 2013-01-30 2019-07-30 Clearsign Combustion Corporation Burner system including at least one coanda surface and electrodynamic control system, and related methods
WO2015051377A1 (fr) 2013-10-04 2015-04-09 Clearsign Combustion Corporation Dispositif d'ionisation pour un système de combustion
WO2016003883A1 (fr) 2014-06-30 2016-01-07 Clearsign Combustion Corporation Alimentation électrique à faible inertie pour appliquer une tension sur une électrode couplée à une flamme
US10514165B2 (en) 2016-07-29 2019-12-24 Clearsign Combustion Corporation Perforated flame holder and system including protection from abrasive or corrosive fuel
US10619845B2 (en) 2016-08-18 2020-04-14 Clearsign Combustion Corporation Cooled ceramic electrode supports
WO2022080552A1 (fr) * 2020-10-13 2022-04-21 (주)창화에너지 Chambre de combustion et chaudière associée

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US10359189B2 (en) 2012-09-10 2019-07-23 Clearsign Combustion Corporation Electrodynamic combustion control with current limiting electrical element
US9494317B2 (en) 2012-09-10 2016-11-15 Clearsign Combustion Corporation Electrodynamic combustion control with current limiting electrical element
US9496688B2 (en) 2012-11-27 2016-11-15 Clearsign Combustion Corporation Precombustion ionization
US9513006B2 (en) 2012-11-27 2016-12-06 Clearsign Combustion Corporation Electrodynamic burner with a flame ionizer
US9441834B2 (en) 2012-12-28 2016-09-13 Clearsign Combustion Corporation Wirelessly powered electrodynamic combustion control system
US11460188B2 (en) 2013-02-14 2022-10-04 Clearsign Technologies Corporation Ultra low emissions firetube boiler burner
US10571124B2 (en) 2013-02-14 2020-02-25 Clearsign Combustion Corporation Selectable dilution low NOx burner
US9803855B2 (en) 2013-02-14 2017-10-31 Clearsign Combustion Corporation Selectable dilution low NOx burner
US10823401B2 (en) 2013-02-14 2020-11-03 Clearsign Technologies Corporation Burner system including a non-planar perforated flame holder
US10359213B2 (en) 2013-02-14 2019-07-23 Clearsign Combustion Corporation Method for low NOx fire tube boiler
US10077899B2 (en) 2013-02-14 2018-09-18 Clearsign Combustion Corporation Startup method and mechanism for a burner having a perforated flame holder
US10386062B2 (en) 2013-02-14 2019-08-20 Clearsign Combustion Corporation Method for operating a combustion system including a perforated flame holder
US9664386B2 (en) 2013-03-05 2017-05-30 Clearsign Combustion Corporation Dynamic flame control
US9909759B2 (en) 2013-03-08 2018-03-06 Clearsign Combustion Corporation System for electrically-driven classification of combustion particles
US9371994B2 (en) 2013-03-08 2016-06-21 Clearsign Combustion Corporation Method for Electrically-driven classification of combustion particles
US10190767B2 (en) 2013-03-27 2019-01-29 Clearsign Combustion Corporation Electrically controlled combustion fluid flow
US10808925B2 (en) 2013-03-27 2020-10-20 Clearsign Technologies Corporation Method for electrically controlled combustion fluid flow
US10125979B2 (en) 2013-05-10 2018-11-13 Clearsign Combustion Corporation Combustion system and method for electrically assisted start-up
US10364980B2 (en) 2013-09-23 2019-07-30 Clearsign Combustion Corporation Control of combustion reaction physical extent
US10808927B2 (en) 2013-10-07 2020-10-20 Clearsign Technologies Corporation Pre-mixed fuel burner with perforated flame holder
US10295185B2 (en) 2013-10-14 2019-05-21 Clearsign Combustion Corporation Flame visualization control for electrodynamic combustion control
US10240788B2 (en) 2013-11-08 2019-03-26 Clearsign Combustion Corporation Combustion system with flame location actuation
US10066835B2 (en) 2013-11-08 2018-09-04 Clearsign Combustion Corporation Combustion system with flame location actuation
US10458647B2 (en) 2014-08-15 2019-10-29 Clearsign Combustion Corporation Adaptor for providing electrical combustion control to a burner
US9702547B2 (en) 2014-10-15 2017-07-11 Clearsign Combustion Corporation Current gated electrode for applying an electric field to a flame
US10006715B2 (en) 2015-02-17 2018-06-26 Clearsign Combustion Corporation Tunnel burner including a perforated flame holder

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