WO2013148738A1 - Brûleur à combustible solide à homogénéisation électrodynamique - Google Patents

Brûleur à combustible solide à homogénéisation électrodynamique Download PDF

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Publication number
WO2013148738A1
WO2013148738A1 PCT/US2013/033950 US2013033950W WO2013148738A1 WO 2013148738 A1 WO2013148738 A1 WO 2013148738A1 US 2013033950 W US2013033950 W US 2013033950W WO 2013148738 A1 WO2013148738 A1 WO 2013148738A1
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WO
WIPO (PCT)
Prior art keywords
solid fuel
electrode
operating
fuel burner
electric field
Prior art date
Application number
PCT/US2013/033950
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English (en)
Inventor
Tim W. SONNICHSEN
Tracy A. PREVO
Joseph Colannino
David B. Goodson
Christopher A. Wiklof
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
Priority to CN201380016192.9A priority Critical patent/CN104285099A/zh
Publication of WO2013148738A1 publication Critical patent/WO2013148738A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23B—METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
    • F23B90/00—Combustion methods not related to a particular type of apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23B—METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
    • F23B99/00—Subject matter not provided for in other groups of this subclass
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23B—METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
    • F23B2900/00—Special features of, or arrangements for combustion apparatus using solid fuels; Combustion processes therefor
    • F23B2900/00006—Means for applying electricity to flame, e.g. an electric field

Definitions

  • FIG. 1 is a diagram illustrating a portion of a grate-fed solid fuel burner 101 according to the prior art and which is improved according to the disclosure herein.
  • a solid fuel burner may include walls 102 defining a combustion volume and a grate 104 on which solid fuel 106 is supported.
  • Underfire combustion air may be delivered to the fuel from below the grate 104 via an underfire or primary air source 108 from an air blower 1 10.
  • Hot gas 1 12 may then be delivered to generate electricity (e.g., by heating water tubes for delivery of steam to a steam turbine), to heat air (e.g., by transferring energy through an air-air heat
  • the fuel 106 may include various solid fuels such as lump coal (e.g. anthracite, bituminous coal, and/or lignite), biomass fuel, tire-derived fuel (TDF), municipal solid waste (MSW), refuse derived fuel (RDF), hazardous solid waste, etc.
  • lump coal e.g. anthracite, bituminous coal, and/or lignite
  • biomass fuel e.g. anthracite, bituminous coal, and/or lignite
  • TDF tire-derived fuel
  • MSW municipal solid waste
  • RDF refuse derived fuel
  • hazardous solid waste e.g., hazardous solid waste, etc.
  • Solid fuel burners are notorious for non-ideal flow behavior such as clumping.
  • Fuel clumping has been associated with variable resistance to undergrate air flow. Fuel clumping may be visualized as a formation of "hills" 1 14 and “valleys” 1 16 in fuel 106 on the grate 104. The hills 1 14 typically have high resistance to airflow, and the valleys 1 16 typically have low resistance to airflow. Additionally, airflow may be affected by proximity to the walls 102. A result of this variable resistance to airflow is that there may be less airflow than desirable in regions 1 18 above the hills 1 14, and more airflow than desirable in regions 120 above the valleys 1 16.
  • the solid fuel 106 typically volatilizes responsive to high temperatures from combustion, and it is the volatilized, gas phase components that actually burn. There may be more volatilization above the hills 1 14 than the valleys 1 16, which may further add to the disparity in composition between the regions 1 18 above the hills 1 14 and the regions 120 above the valleys.
  • the non-homogeneity of the regions 1 18, 120 leads to two undesirable conditions. Regions 1 18 with low airflow tend not to have enough oxygen for complete combustion. This results in cooler temperatures and high output of carbon monoxide (CO) and other products of incomplete combustion.
  • CO carbon monoxide
  • overfire or secondary air above the grate 104 and the fuel 106 with one or more overfire air sources 122.
  • the overfire air is typically introduced at high velocity to help mixing of the regions 1 18, 120.
  • overfire air may provide more oxygen to complete combustion of CO to carbon dioxide (CO 2 ), it may not affect or can even make more severe the formation of NOx.
  • overfire air is added in excess. Excess overfire air reduces the temperature of flue gases 1 12 and can reduce thermodynamic efficiency of processes driven by the heat produced by combustion.
  • Reduced thermodynamic efficiency may generally require burning more fuel to create a desired output, or may reduce the amount of the output for a given amount of fuel.
  • the ability to deliver overfire air across a wide grate 104 is limited by the amount of inertia that can be imparted on the overfire air and the distance it can travel through buoyant forces associated with the combustion.
  • a solid fuel burner may be provided with a system for providing electrodynamic homogenization.
  • the solid fuel burner may include a grate configured to support a burning solid fuel and an underfire air source configured to deliver underfire air to the burning solid fuel from below the grate.
  • the system for providing electrodynamic homogenization may include an electrode (one or more electrodes) configured to apply an electric field to the burning solid fuel or a region proximate the burning solid fuel.
  • the electric field which may include a time-varying electric field, may be selected to cause mixing and homogenization of volatilized fractions of the solid fuel, combustion gases, and air.
  • the improved mixing and homogenization may result in reduced emission of carbon monoxide (CO), reduced emission of oxides of nitrogen (NOx), reduced oxygen in flue gas, increased temperature of flue gas, and/or allow for a larger grate surface.
  • a solid fuel burner may include a system for providing electrodynamic homogenization.
  • the system may include a grate configured to support a burning solid fuel and an underfire air source configured to deliver underfire air to the burning solid fuel from below the grate.
  • An electrode one or more electrodes
  • the electric field which may include a time-varying electric field, may be selected to cause mixing and homogenization of volatilized fractions of the solid fuel, combustion gases, and air.
  • the improved mixing and homogenization may result in reduced emission of carbon monoxide (CO), reduced emission of oxides of nitrogen (NOx), reduced oxygen in flue gas, increased temperature of flue gas, and/or allow for a larger grate surface.
  • a method for operating a solid fuel burner may include delivering underfire combustion air below a grate, burning solid fuel on the grate with the combustion air in a combustion reaction, and homogenizing a mixture of volatilized solid fuel and underfire combustion air in the combustion reaction by applying an electric field with at least one electrode disposed above the grate or comprising the grate.
  • the electric field may include a time-varying electric field.
  • FIG. 1 is a diagram illustrating an aspect of a grate-fed solid fuel burner according to the prior art and which is improved according to the disclosure herein.
  • FIG. 2 is a diagram of a solid fuel burner configured for electrodynamic homogenization, according to an embodiment.
  • FIG. 3 is a diagram of a solid fuel burner configured for electrodynamic homogenization, according to another embodiment.
  • FIG. 4 is a diagram of a solid fuel burner configured for electrodynamic homogenization, according to another embodiment.
  • FIG. 5 is a flow chart showing a method for operating a solid fuel burner with electrodynamic homogenization, according to an embodiment.
  • FIG. 2 is a diagram of a solid fuel burner 201 configured for
  • the solid fuel burner 201 may include a grate 104 configured to support a burning solid fuel 106.
  • An underfire air source 108 may be configured to deliver underfire air to the burning solid fuel 106 from below the grate 104.
  • One may alternatively refer to the underfire air source 108as a primary air source or an undergrate air source.
  • a system for providing electrodynamic homogenization may include an electrode 202 configured to apply an electric field to the burning solid fuel 106 or a region 1 18, 120 proximate the burning solid fuel 106. The electric field may be selected to cause mixing and homogenization of volatilized fractions of the solid fuel, combustion gases, and air.
  • FIG. 3 is a diagram of a solid fuel burner 301 configured for electrodynamic homogenization according to another embodiment wherein the electrode 302 includes the grate 104.
  • the solid fuel burner may include a wall 102 defining a
  • FIG. 4 is a diagram of a solid fuel burner 401 according to another embodiment where the electrode 402 is disposed outside the
  • the electrode 202, 302, 402 may include a plurality of electrodes. Such a plurality may include plural electrodes 202 located in the combustion volume, plural grate electrodes 302 located in the combustion volume and/or plural electrodes 402 located outside the combustion volume. Plural electrodes may also include combinations of two or more of the electrodes 202, 302, 402 indicated diagramnnatically in FIGS. 2-4. It will be understood (unless expressly indicated otherwise) that references to "an electrode” herein shall refer to any combination of single or plural electrodes indicated in the embodiments 201 , 301 , 401 .
  • concentration differences without the electrodynamic homogenization may include a more oxidizing atmosphere 120 above regions of the grate 104 carrying a small solid fuel 106 pile depth 1 16, and a more reducing atmosphere 1 18 above regions of the grate 104 carrying a large solid fuel 106 pile depth 1 14.
  • the solid fuel burner 201 , 301 , 401 may include an overfire air source 122 configured to deliver overfire air above the grate 104.
  • Application of the electric field by the electrode 202, 302, 402 may result in a reduction in the amount of overfire air required to meet emission requirements compared to a system not including the electrode 202, 302, 402 and/or not providing electrodynamic homogenization.
  • Application of the electric field by the electrode 202, 302, 402 may result in a reduction in an amount of underfire or undergrate air required to meet emission requirements compared to a system not including the electrode 202, 302, 402 and/or not providing electrodynamic homogenization.
  • application of the electric field by the electrode 202, 302, 402 may result in a reduction in the amount of total air required to meet emission requirements compared to a system not including the electrode 202, 302, 402 and/or not providing electrodynamic homogenization.
  • application of the electric field by the electrode 202, 302, 402 may result in a reduction in an emission of one or more of oxides of nitrogen (NOx) and carbon monoxide (CO) from the solid fuel 106 burning compared to a system not including the electrode 202, 302, 402 and/or not providing electrodynamic homogenization.
  • NOx oxides of nitrogen
  • CO carbon monoxide
  • the application of the electric field by the electrode 202, 302, 402 may result in heat release nearer the solid fuel 106 compared to a system not including the electrode 202, 302, 402 and/or not providing electrodynamic homogenization.
  • the release of heat nearer the solid fuel 106 may provide enhanced drying of the solid fuel 106. This may allow the use of lower grade fuels, reduced pre-processing of fuel, and/or may allow the use of fuels that cannot normally be fired without application of heat from a second combustion reaction (e.g., co-firing with natural gas).
  • the solid fuel burner 201 , 301 , 401 may include an electrode controller 204 operatively coupled to the electrode(s) 202, 302, 402 and configured to determine an electrode 202, 302, 402 voltage or charge concentration corresponding to the electric field.
  • the electrode controller 204 may include one or more of a state machine, a field-programmable gate array, a microcontroller, or discrete components configured to determine the electric field.
  • the solid fuel burner 201 , 301 , 401 may include an amplifier or voltage multiplier 206 operatively coupled to the electrode controller 204 and the electrode(s) 202, 302, 402, or included in the electrode controller 204 and operatively coupled to the electrode(s) 202, 302, 402.
  • the amplifier or voltage multiplier 206 may be configured to output an operating voltage waveform to the electrode(s) 202, 302, 402 responsive to a logic level digital or low voltage analog signal received from the electrode controller 204.
  • the electric field may include a time-varying electric field and the voltage may similarly correspond to a time-varying voltage applied to the electrode(s).
  • the time-varying electric field may include an electric field that varies according to an alternating current (AC) voltage waveform applied to the electrode(s).
  • the time-varying voltage may include a sinusoidal, square wave, sawtooth wave, triangular wave, truncated triangular wave, logarithmic, or exponential waveform.
  • Various voltages may be used.
  • the time-varying voltage applied to the electrode(s) may include a periodic voltage having an amplitude of 4000 to 1 15,000 volts (or ⁇ 4000 to 1 15,000 volts).
  • the time-varying voltage may include a periodic voltage having a frequency of 50 to 800 Hertz, for example.
  • the time-varying voltage can have a periodic frequency of 200 Hertz to 300 Hertz.
  • the solid fuel burner 201 , 301 , 401 may include one or more sensors (not shown) operatively coupled to the electrode controller 204 and configured to measure one or more characteristics of the burning of the solid fuel 106, the flame, or combustion gas produced by the burning solid fuel 106.
  • the one or more sensors may be configured to measure a variable characteristic of a completeness of combustion or a fuel 106 characteristic.
  • the electrode controller 204 may be configured to select an electric field characteristic to increase gas mixing when the completeness of combustion is lower than a target value or when the fuel 106 characteristic corresponds to a need to increase mixing.
  • the solid fuel burner 201 (and variants 301 , 401 ) may include a
  • the electrode controller 204 may be configured to control one or more of an overfire air 122 flow, the underfire air 108 flow, or a rate of fuel delivered by a stoker.
  • the solid fuel burner 201 , 301 , 401 may include one or more of an overfire air controller (not shown), an underfire air controller (not shown), or a stoker controller (not shown) operatively coupled to the electrode controller 204.
  • the solid fuel burner 201 , 301 , 401 may include a physical gap (not shown) between a stoker (not shown) and the solid fuel 106 on the grate 104, the gap being configured to reduce or eliminate current leakage from the electric field through fuel carried by the stoker (not shown).
  • the solid fuel burner 201 , 301 , 401 may include a fuel cache (not shown) operatively coupled to a fuel stoker (not shown) and electrical insulation (not shown) between the fuel cache (not shown) and a support structure (not shown)
  • the fuel cache (not shown) and the electrical insulation (not shown) may be configured to reduce or eliminate current leakage from the electric field through the stoker (not shown) and fuel positioned near a stoker intake (not shown).
  • the solid fuel 106 may include at least one of a biomass fuel, coal, a tire-derived fuel (TDF), municipal solid waste (MSW), refuse derived fuel (RDF), or a hazardous solid waste.
  • a biomass fuel coal
  • MSW municipal solid waste
  • RDF refuse derived fuel
  • FIG 5 is a flow chart depicting a method 501 for operating a solid fuel burner with electrodynamic homogenization of the combustion reaction.
  • solid fuel may be delivered to a grate.
  • the solid fuel may be delivered to the grate with a mechanical or pneumatic stoker.
  • underfire combustion air may be fed from below the grate.
  • solid fuel on the grate may be burned with at least the underfire combustion air in a combustion reaction. Burning the solid fuel may include burning the solid fuel in a combustion volume defined by a wall.
  • applying the electric field with at least one electrode may include applying an electric field with at least one electrode disposed inside the combustion volume.
  • the at least one electrode may be disposed above the grate.
  • the at least one electrode may include the grate.
  • applying the electric field with at least one electrode may include applying the electric field with at least one electrode disposed outside the combustion volume.
  • the at least one electrode may include a single electrode, or may include a plurality of electrodes.
  • the plurality of electrodes may include a plurality of electrodes disposed similarly, for example, all electrodes being above the grate, all electrodes including portions of the grate, or all electrodes being disposed outside the combustion volume.
  • a plurality of electrodes may include one or more electrodes above the grate, one or more electrodes comprising the grate, and/or one or more electrodes disposed outside the combustion volume.
  • Step 508 may include operating an electrode controller to determine the electric field.
  • the electric field may be a DC electric field or an intermittently applied DC electric field.
  • the electric field may include a time-varying electric field.
  • Operating the electrode controller may include amplifying a logic level digital or low voltage analog signal received from the electrode controller to an operating voltage placed on the at least one electrode. Additionally or alternatively, operating the electrode controller may include one or more of operating a state machine, operating a field- programmable gate array, operating a microcontroller, or operating discrete components configured to determine (optionally time-varying) electric field.
  • a time-varying electric field may include an electric field that varies according to an alternating current (AC) voltage waveform applied to the electrode(s).
  • the time-varying electric field may include a sinusoidal, square wave, sawtooth wave, triangular wave, truncated triangular wave, logarithmic, or exponential waveform.
  • the method 501 may include operating one or more sensors operatively coupled to the electrode controller to measure one or more characteristics of the combustion reaction.
  • operating one or more sensors may include measuring a variable characteristic of a completeness of combustion.
  • Operating the electrode controller in step 508 may include selecting the electric field to increase the homogenization when the completeness of combustion is lower than a target value.
  • the electrodynamic homogenization may increase uniformity in oxygen concentration above the grate.
  • the differences may be caused by solid fuel pile depth variations across the grate, the differences include a more oxidizing atmosphere above regions of the grate carrying a small solid fuel pile depth and a more reducing atmosphere above regions of the grate carrying a large solid fuel pile depth.
  • the application of the electric field by the electrode in step 508 may further increase the release of heat near the fuel. This may be used to dry wet fuel, pre-heat difficult-to-burn fuel, or otherwise improve fuel flexibility.
  • overfire or secondary air may be applied over the burning fuel on the grate.
  • this may include operating an overfire air source.
  • Operating the overfire air source may include delivering sufficient overfire air to substantially complete combustion of the solid fuel.
  • the application of the electric field by the electrode may results in a reduction in the amount of overfire air required to meet emission requirements compared to a system not including the electrode.
  • the electrodynamic homogenization provided by the application of the electric field by the electrode may result in a reduction in an amount of underfire air required to meet emission requirements compared to a system not including the electrode.
  • the application of the electric field by the electrode may results in a reduction in an amount of total air required to meet emission requirements compared to a system not including the electrode.
  • the application of the electric field by the electrode may result in a reduction in an emission of one or more of oxides of nitrogen (NOx) and carbon monoxide (CO) from the solid fuel burning compared to a system not including the electrode to apply the electric field.
  • NOx oxides of nitrogen
  • CO carbon monoxide
  • the method 501 may optionally include controlling one or more of an overfire air flow, the underfire air flow, or a rate of fuel delivered by the stoker. Additionally or alternatively, the method 501 may include communicating, from an electrode controller, with one or more of an overfire air controller, an underfire air controller or a stoker controller.
  • the solid fuel may include a biomass fuel, coal, tire-derived fuel (TDF), or other solid fuel.
  • TDF tire-derived fuel
  • fuel flexibility may be improved by the electrodynamic homogenization.
  • current leakage from the electric field through the solid fuel may be reduced or eliminated by maintaining an air gap between the stoker and the solid fuel on the grate. Additionally or alternatively, current leakage from the electric field through the fuel may be reduced or eliminated by delivering electrically isolated fuel to a fuel cache, maintaining electrical insulation between the fuel cache and a support structure and between the stoker and the support structure. The stoker may deliver the solid fuel from the electrically isolated fuel cache.
  • heat from the combustion may be supplied.
  • the heat may be supplied to an electrical generation system, a chemical process, or to provide domestic heating.
  • the method for operating a solid fuel burner 301 may include operating one or more sensors operatively coupled to an electrode controller to measure one or more characteristics of the combustion reaction. Operating one or more sensors may include measuring a variable characteristic of a completeness of combustion. Operating the electrode controller may include selecting the time- varying electric field to increase the homogenization when the completeness of combustion is lower than a target value. At least one sensor (not shown) may be disposed to sense a condition proximate the burning fuel or a combustion gas above the burning fuel. The first sensor may be operatively coupled to the electrode controller via a sensor signal transmission path (not shown). The at least one sensor (not shown) may be configured to sense a combustion parameter of the burning fuel or the combustion gas above the burning fuel.
  • the at least one sensor may include one or more of a flame luminance sensor, a photo-sensor, an infrared sensor, a fuel flow sensor, a temperature sensor, a flue gas temperature sensor, a radio frequency sensor, and/or an airflow sensor.

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

Abstract

L'invention porte sur un brûleur à combustible solide pouvant comprendre un système pour l'homogénéisation électrodynamique. Une ou plusieurs électrodes peuvent appliquer un champ électrique au combustible solide en train de brûler ou une zone à proximité du combustible solide en train de brûler. Le champ électrique provoque le mélange et l'homogénéisation de fractions volatilisées du combustible solide, des gaz de combustion et de l'air. Le mélange amélioré et l'homogénéisation permettent de réduire l'émission de monoxyde de carbone (CO), de réduire l'émission d'oxydes d'azote (NOx), de réduire l'oxygène dans le gaz de combustion, d'augmenter la température du gaz de combustion et/ou de permettre une plus grande surface de grille.
PCT/US2013/033950 2012-03-27 2013-03-26 Brûleur à combustible solide à homogénéisation électrodynamique WO2013148738A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201380016192.9A CN104285099A (zh) 2012-03-27 2013-03-26 带电动均化的固体燃料燃烧器

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US201261616223P 2012-03-27 2012-03-27
US61/616,223 2012-03-27
US201261640095P 2012-04-30 2012-04-30
US61/640,095 2012-04-30

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WO2013148738A1 true WO2013148738A1 (fr) 2013-10-03

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105879599A (zh) * 2014-12-24 2016-08-24 苏州超等环保科技有限公司 一种防爆式等离子有机废气处理装置
CN110529019A (zh) * 2019-09-19 2019-12-03 温州普锐智能科技有限公司 一种空调玻璃窗

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WO1996001394A1 (fr) * 1994-07-01 1996-01-18 Torfinn Johnsen Ensemble d'electrodes concu pour s'utiliser dans une chambre de combustion
US5702244A (en) * 1994-06-15 1997-12-30 Thermal Energy Systems, Incorporated Apparatus and method for reducing particulate emissions from combustion processes
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US7137808B2 (en) * 2001-08-01 2006-11-21 Siemens Aktiengesellschaft Method and device for influencing combustion processes involving combustibles
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CN101033840A (zh) * 2006-03-10 2007-09-12 袁野 一种应用在燃烧室的电子助燃器
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US5702244A (en) * 1994-06-15 1997-12-30 Thermal Energy Systems, Incorporated Apparatus and method for reducing particulate emissions from combustion processes
WO1996001394A1 (fr) * 1994-07-01 1996-01-18 Torfinn Johnsen Ensemble d'electrodes concu pour s'utiliser dans une chambre de combustion
US7137808B2 (en) * 2001-08-01 2006-11-21 Siemens Aktiengesellschaft Method and device for influencing combustion processes involving combustibles
US20070020567A1 (en) * 2002-12-23 2007-01-25 Branston David W Method and device for influencing combution processes of fuels
US20040255831A1 (en) * 2003-06-18 2004-12-23 Joseph Rabovitser Combustion-based emission reduction method and system

Cited By (2)

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Publication number Priority date Publication date Assignee Title
CN105879599A (zh) * 2014-12-24 2016-08-24 苏州超等环保科技有限公司 一种防爆式等离子有机废气处理装置
CN110529019A (zh) * 2019-09-19 2019-12-03 温州普锐智能科技有限公司 一种空调玻璃窗

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