According to an embodiment, a burner system may include a burner configured to support a flame, the flame or a combustion gas produced by the flame carrying a majority of first charged particles having a first sign. The embodiment may further include at least one inertial electrode launcher that may be configured to launch an inertial electrode in proximity to the flame or the combustion gas produced by the flame. The inertial electrode may include charged particles or it may carry a voltage. The inertial electrode may be configured to affect a shape or location of the flame and/or affect a concentration or distribution of the charged particles in the flame or the combustion gas produced by the flame.
According to another embodiment, a method for operating a burner system may include supporting a flame with a burner and launching an inertial electrode carrying charged particles or a voltage in proximity to the flame or to a combustion gas produced by the flame. The method may include selecting a charge sign or a voltage for the inertial electrode. The sign or charge may include a sequence of different charge signs or voltages. The inertial electrode may affect the flame or the combustion gas produced by the flame.
In the following detailed description, reference is made to the accompanying drawings, which form a part hereof. In the drawings, similar symbols typically identify similar components, unless context dictates otherwise. The illustrative embodiments described in the detailed description, drawings, and claims are not meant to be limiting. Other embodiments may be utilized, and other changes may be made, without departing from the spirit or scope of the subject matter presented here.
The momentum imparted onto the inertial electrode 112, the charged particles 114, and/or the voltage carried by the inertial electrode 112 may be selected to cause the first charged particles 106 carried by the flame 104 or a combustion gas 116 to respond to the momentum and to the charged particles 114 or voltage carried by the inertial electrode 112. Acceleration imparted on the charged particles 106 may be transferred to uncharged particles in the flame 104 or the combustion gas 116 to produce an overall movement of the flame, change a reaction rate of the flame, flatten the flame, lengthen the flame, bend the flame, affect a location of the flame 104, direct the flame 104 or combustion gas 116, or otherwise affect the flame 104 or combustion gas 116.
According to an embodiment, the inertial electrode may be selected to impart a majority charge on the flame 104 or on the combustion gas 116 produced by the flame 104.
As indicated above, the inertial electrode 112 may be configured to affect a shape or location of the flame 104 and/or to affect a concentration or distribution of the charged particles 106 in the flame 104 or combustion gas 116 produced by the flame 104.
Optionally, the inertial electrode launcher 110 and inertial electrode 112 may respectively include a plurality of inertial electrode launchers 110 and inertial electrodes 112.
An electrode driver 118 may be configured to drive, i.e., to control and operate one or more of the functions or operations performed by the inertial electrode launcher(s) 110. The electrode driver 118 may be configured to periodically or intermittently cooperate with the inertial electrode launcher 110 to change a concentration of the charged particles 114 or the voltage carried by the inertial electrode 112. For example, the electrode driver 118 may be configured to periodically or intermittently change a sign of the charged particles 114 or the voltage carried by the inertial electrode 112.
Optionally, the inertial electrode launcher 110 may include or be coupled to a directional actuator (not shown) configured to determine a direction in which the inertial electrode 112 is launched by the inertial electrode launcher 110. The electrode driver 118 may be further configured to control the directional actuator. Optionally, the inertial electrode launcher 110 may include a location actuator (not shown) configured to determine a location from which the inertial electrode 112 is launched by the inertial electrode launcher 110. The electrode driver 118 may be configured to control the location actuator.
The burner 102 may include a fuel source 120, configured to provide fuel for the flame 104, and an insulator or gap 122, configured to isolate charges 106 in the flame 104 and charges 114 or voltage carried by the inertial electrode 112 from ground. A flame holder 124 may be configured to hold the flame 104. For example, the flame holder 124 may be referred to as a bluff body.
The flame 104 may be a diffusion flame, for example. Alternatively, the burner 102 may be configured to at least partially premix the fuel and an oxidizer such as oxygen contained in air.
The burner system 101 may include or be operatively coupled to an object 126 selected to be heated by or selected to be protected from heating by the flame 104 or the combustion gas 116 produced by the flame 104. For example, the object 126 may include a furnace wall, a boiler wall, a combustor wall, a heat transfer surface, an air-to-air heat exchanger, an air-to-liquid heat exchanger, a chemical reactor, a sensor, a turbine blade, a fireplace, and/or an object in an environment exposed to the flame 104 or to combustion gas 116 produced by the flame 104. The inertial electrode launcher 110 may be configured to launch an inertial electrode 112 carrying charges 114 or a voltage selected to cause the flame 104 or combustion gas 116 produced by the flame 104 to transfer relatively more heat to the object 126. Alternatively, the inertial electrode launcher 110 may be configured to cause the flame 104 or the combustion gas 116 to transfer relatively less heat to the object 126. The object 126 may be electrically grounded or may be driven to a voltage. For example, the object 126 may be driven to or held at a voltage having an opposite sign compared to the sign of the charges 114 or the voltage carried by the inertial electrode 112. Alternatively, the object 126 may be driven to or held at a voltage having the same sign compared to the sign of the charges or the voltage carried by the inertial electrode 112. According to other embodiments, the object 126 may be insulated from ground and not driven to a voltage different than a voltage imparted by cooperation of the inertial electrode 112 with the flame 104. For example, the object 126 may follow an AC or chopped DC waveform applied by the electrode controller 118.
Various assemblies are contemplated with respect to embodiments of the inertial electrode launcher 110.
For example, the charging apparatus 204 may be driven to a positive voltage, attracting negative charges 206 to the charging apparatus 204, leaving positive majority charges 114 in the inertial electrode 112, or at least a portion of the inertial electrode 112. Conversely, if the charging apparatus 204 is driven to a negative voltage, positive charges 206 may be attracted to the charging apparatus electrode 204, leaving negative majority charges 114 in the inertial electrode 112. Alternatively, the charging apparatus 204 may be configured to output the majority charges to the inertial electrode 112. For example, the charging apparatus 204 may be formed as a corona electrode configured to eject charges having the same sign as the desired inertial electrode 112 majority charge.
The charging apparatus 204 may be formed by at least a portion of a boiler wall, or other structure associated with the function of the burner. Alternatively, the charging apparatus 204 may be an extrinsic structure introduced into a burner volume through an air gap or insulated and/or shielded sleeve. According to other embodiments, the charging apparatus 204 may be formed by the inertial electrode burner 202 or by an electrical conductor intrinsic to the inertial electrode burner 202.
The electrode driver 118 may be configured to apply a voltage to the charging apparatus 204 to control at least one of the sign or concentration of the charged particles 114 in the inertial electrode 112.
A valve 208 may be configured to control a flow of fuel to the inertial electrode burner 202. The electrode driver 118 may be configured to control the valve 208. An igniter or pilot (not shown) may be configured to ignite the inertial electrode 112 when the valve 208 is opened. An electrical insulator or gap 210 may be configured to electrically isolate the inertial electrode 112 from ground or another voltage.
Referring to
A flow passage 310 may be configured to admit the liquid or other vaporizing material 308 to the vaporization well 304. A valve or actuator 312 may be configured to enable a flow of the liquid 308 through the fluid flow passage 310 to the vaporization well 304. The valve or actuator 312 may be operatively coupled to the electrode driver 118. The inertial electrode launcher 110 may include a nozzle 314 configured to determine a direction of travel 316 of a vapor, an aerosol, or a vapor and aerosol of the vaporizing material 308 forming the inertial electrode 112. An actuator (not shown) may be configured to align the nozzle 314 to an intended direction of travel 316 of the vapor, aerosol, or vapor and aerosol of the liquid 308 forming the inertial electrode 112. The actuator (not shown) may be operatively coupled to the electrode driver 118.
The vaporizing material 308 may include a liquid such as water. The liquid may also include a buffer solution or be at least partly functionalized to hold the charge 114. The bias voltage may be positive at least intermittently or periodically. A majority of the charged particles 114 may carry a positive charge at least intermittently or periodically corresponding to the (positive) bias voltage. Alternatively, the bias voltage may be negative at least intermittently or periodically. A majority of the charged particles 114 may carry a negative charge at least intermittently or periodically corresponding to the (negative) bias voltage.
The body 402 may include a wall of a furnace or boiler. The body 402 may include refractory material. The orifice 404 may include a Venturi passage, for example. The solid particles 406 may be configured to be projected by an entrainment fluid 408 passing through the orifice 404. The entrainment fluid 408 may include air. Additionally or alternatively, the entrainment fluid 408 may include an overfire oxidizer.
A particle channel 410 may be positioned adjacent to the orifice 404. The solid particles 406 may be injected into a passing entrainment fluid at the orifice 404 through the particle channel 410. The electrode driver 118 may be operatively coupled to the inertial electrode launcher 401. The particle valve 412 may be operatively coupled to the electrode driver 118. The electrode driver 118 may be configured to control at least one of a rate of flow of particles through the particle channel 410 or a periodic or intermittent particle flow through the particle channel 410. A corona surface 414 may be configured to be driven to a sufficiently high voltage to cause an emission of charges. At least some of the charges emitted by the corona may be deposited on at least some of the solid particles 406 to form the charged solid particles. The corona surface 414 may include a corona wire (not shown), a corotron (not shown), and/or a scorotron (not shown). The electrode driver 118 may be configured to control the voltage to which the corona surface 414 is driven.
Referring to
An actuator (not shown) may be configured to align the orifice 404 to an intended direction of travel 416 of the charged solid particles (not shown) that include solid particle 406 and the at least one or more charge particle 114 forming the inertial electrode 112. The actuator may be operatively coupled to the electrode driver 118. One or more steering electrodes (not shown) may be operatively coupled to the electrode driver 118. The electrode driver 118 may be configured to energize the one or more steering electrodes (not shown) to deflect the charged solid particles (not shown) forming the inertial electrode 112 toward an intended direction of travel 416.
Optionally, the orifice 404 may be arranged to be protected from a fluid flow past the burner 102. The inertial electrode 112 may be configured as a flame holder for the flame 104. The arrangement for protection of the orifice 404 from the fluid flow past the burner 102 may include positioning the inertial electrode launcher 110 in the lee of a physical fluid flow barrier (not shown). The solid particles 406 may include comminuted coal, coke, or carbon. Additionally or alternatively, the solid particles 406 may be selected to react in the flame 104 or with combustion gas 116 produced by the flame 104.
The burner system 101 may include a valve 504 operatively coupled to the electrode driver 118 and a fluid supply system 506 in communication with the nozzle 502 through the valve 504. The valve may be configured to respond to an actuation signal from the electrode driver 118 to at least intermittently or periodically open flow of the fluid 510 from a fluid supply system 506 to flow through the nozzle 502. The fluid supply system 506 may be configured to supply the fluid 510 to the nozzle 502 and maintain electrical isolation between the fluid 510 and a fluid source 516. The fluid supply system 506 may include tank 508 to hold the fluid 510, the tank being made of an electrically insulating material or being supported by electrical insulators 512 to isolate the fluid 510 from ground or another voltage. An antisiphon arrangement 514 may be configured to maintain electrical isolation between the fluid 510 and the fluid source 516.
Referring to
The fluid may form the inertial electrode 112 as a stream emitted from the nozzle 502. An actuator (not shown) operatively coupled to the electrode driver 118 may be configured to align the nozzle 502 to an intended direction of travel of the inertial electrode 112.
Proceeding to step 606, the inertial electrode may be launched in proximity to the flame or a combustion gas produced by the flame. A selected time-varying sign of the charged particles or voltage selected in step 604 may be carried by the inertial electrode launched in step 606. For inertial electrodes that are non-continuous, the start of inertial electrode projection may include a voltage or charge concentration corresponding to the portion of the waveform corresponding to onset of electrode projection, with the charge concentration or voltage in the inertial electrode then varying with the voltage applied to the inertial electrode launcher until the inertial electrode projection is again shut off. Alternatively, a voltage applied to all or a portion of the inertial electrode launcher may be held continuous, and the timing of an application of a correspondingly charged or voltage carrying inertial electrode into proximity to the flame or the combustion gas produced by the flame may be determined by controlling the timing of inertial electrode “on” and inertial electrode “off” times.
Proceeding to step 608, the flame or the combustion gas produced by the flame may be affected by the inertial electrode. For example, the flame or the combustion gas produced by the flame may include at least transiently present charged particles (such as in charge-balanced proportion or as a majority charge). A variety of ways for the flame or the combustion gas produced by the flame to be affected by the inertial electrode are contemplated. For example, the inertial electrode may affect a rate of reaction by interaction in the flame or the combustion gas produced by the flame. Additionally or alternatively, a shape of the flame or a flow direction of the combustion gas may vary responsively to the inertial electrode.
The inertial electrode may cause the flame or combustion gas produced by the flame to preferentially transfer heat to an object. The object may be electrically grounded. The inertial electrode may impart electrically charged particles onto the flame or the combustion gas produced by the flame such that the electrically charged particles and the heat from the flame or the combustion gas produced by the flame is electrically attracted to the electrically grounded object to preferentially provide the heat.
Additionally, step 608 may include applying an electrical potential to the object. Applying an electrical potential to the object may affect the flame or the combustion gas produced by the flame with the inertial electrode. This may preferentially transfer heat to the object and may include imparting electrically charged particles onto the flame or the combustion gas produced by the flame such that the electrically charged particles and the heat from the flame or the combustion gas produced by the flame may be electrically attracted to the electrical potential applied to the object. Alternatively (or intermittently), the inertial electrode may be operative to protect the object from heat. For example, the inertial electrode may impart electrically charged particles onto the flame or the combustion gas produced by the flame such that the electrically charged particles and the heat from the flame or the combustion gas produced by the flame are electrically repelled from the electrical potential applied to the object.
Proceeding to step 610, heat from the flame or from the combustion gas produced by the flame may be supplied to an object. In step 610 an object may additionally or alternatively be protected from heat from the flame or the combustion gas produced by the flame. For example, heat from the flame or the combustion gas produced by the flame may be supplied to an electrical power generator, a turbine, a chemical process plant, a boiler, a water heater, a furnace, a land vehicle, a ship, or an aircraft. Protection from heat may be enabled for purposes of throttling an effect, for shutting down a process, or for protecting the object from overheating.
Optionally, the method for operating a burner system 601 may include applying an electrical potential to a second object (not shown) spaced away from a first object. In step 608 affecting the flame or the combustion gas produced by the flame with the inertial electrode to protect the first object from heat from the flame or the combustion gas produced by the flame may be performed by selecting a sign for the electrically charged particles and therefore the heat from the flame or the combustion gas produced by the flame to be electrically attracted to the electrical potential applied to the second object spaced away from the first object protected from the heat.
Optionally, the inertial electrode launcher may be protected from exposure to a fluid flow past the flame. Affecting the flame or combustion gas produced by the flame in step 608 may include providing flame holding with the inertial electrode. For example, protecting the inertial electrode launcher from exposure to the fluid flow past the flame may include positioning the inertial flame holder and/or at least a portion of the inertial electrode in the lee of a physical fluid flow barrier.
Step 608, affecting a shape or location of the flame with the inertial electrode may include affecting a concentration of the charged particles in the flame or the combustion gas produced by the flame. Additionally, step 608 may include reacting at least a portion of the inertial electrode with the flame or the combustion gas produced by the flame. In some embodiments, the burner may be held or driven to a voltage such as ground. Interactions between the flame and the inertial electrode may be based on differences between a majority charge or a voltage carried by the inertial electrode and the balanced charge or (e.g., ground) voltage carried by the flame or the combustion gas produced by the flame.
As described above, various forms of inertial electrodes are contemplated.
In step 606, launching the inertial electrode may include launching a second flame comprising an inertial electrode (e.g., see
Alternatively, as illustrated in
Alternatively, step 606 may include propelling charged solid particles, as shown in
Alternatively, launching an inertial electrode may include energizing a nozzle with an inertial electrode voltage and projecting a liquid from the nozzle. This approach is illustrated in
Optionally, the method 601 may include selecting or varying a direction of launch of the inertial electrode with an actuator (not shown). Additionally or alternatively, the method 601 may include selecting or actuating a timing, volume, flow duration, charge or voltage sign, or charge concentration of the inertial electrode.
While various aspects and embodiments have been disclosed herein, other aspects and embodiments are contemplated. The various aspects and embodiments disclosed herein are for purposes of illustration and are not intended to be limiting, with the true scope and spirit being indicated by the following claims.
The present application claims priority benefit from U.S. Provisional Patent Application No. 61/605,691, entitled “INERTIAL ELECTRODE AND SYSTEM CONFIGURED FOR ELECTRODYNAMIC INTERACTION WITH A FLAME”, filed Mar. 1, 2012; which, to the extent not inconsistent with the disclosure herein, is incorporated by reference.
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