US20100116182A1 - Resistance heater based air heating device - Google Patents

Resistance heater based air heating device Download PDF

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Publication number
US20100116182A1
US20100116182A1 US12/562,718 US56271809A US2010116182A1 US 20100116182 A1 US20100116182 A1 US 20100116182A1 US 56271809 A US56271809 A US 56271809A US 2010116182 A1 US2010116182 A1 US 2010116182A1
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US
United States
Prior art keywords
resistance heater
heating device
enclosure
air heating
low thermal
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.)
Abandoned
Application number
US12/562,718
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English (en)
Inventor
Thomas A. Chodacki
Louis Castriotta, III
Michael W. Tanguay
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.)
Coorstek Inc
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Saint Gobain Ceramics and Plastics Inc
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 Saint Gobain Ceramics and Plastics Inc filed Critical Saint Gobain Ceramics and Plastics Inc
Priority to US12/562,718 priority Critical patent/US20100116182A1/en
Assigned to SAINT-GOBAIN CERAMICS & PLASTICS, INC. reassignment SAINT-GOBAIN CERAMICS & PLASTICS, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CASTRIOTTA, III, LOUIS, CHODACKI, THOMAS A., TANGUAY, MICHAEL W.
Publication of US20100116182A1 publication Critical patent/US20100116182A1/en
Assigned to COORSTEK, INC. reassignment COORSTEK, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SAINT-GOBAIN CERAMICS & PLASTICS, INC.
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24B—DOMESTIC STOVES OR RANGES FOR SOLID FUELS; IMPLEMENTS FOR USE IN CONNECTION WITH STOVES OR RANGES
    • F24B15/00—Implements for use in connection with stoves or ranges
    • F24B15/005—Igniting devices; Fire-igniting fans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23B—METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
    • F23B50/00—Combustion apparatus in which the fuel is fed into or through the combustion zone by gravity, e.g. from a fuel storage situated above the combustion zone
    • F23B50/12—Combustion apparatus in which the fuel is fed into or through the combustion zone by gravity, e.g. from a fuel storage situated above the combustion zone the fuel being fed to the combustion zone by free fall or by sliding along inclined surfaces, e.g. from a conveyor terminating above the fuel bed
    • 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
    • F23B90/02—Start-up techniques
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23Q—IGNITION; EXTINGUISHING-DEVICES
    • F23Q7/00—Incandescent ignition; Igniters using electrically-produced heat, e.g. lighters for cigarettes; Electrically-heated glowing plugs
    • F23Q7/02—Incandescent ignition; Igniters using electrically-produced heat, e.g. lighters for cigarettes; Electrically-heated glowing plugs for igniting solid fuel
    • F23Q7/04—Incandescent ignition; Igniters using electrically-produced heat, e.g. lighters for cigarettes; Electrically-heated glowing plugs for igniting solid fuel with fans for transfer of heat to fuel

Definitions

  • the present invention relates to devices and structures for igniting the biomass within a furnace and methods related thereto.
  • Biomass is one of the oldest fuels known to man and is vegetation or fuel from plants, agricultural waste products or the like. During photosynthesis, plants combine carbon dioxide from the air and water from the ground to form carbohydrates that are the building blocks of biomass. Burning biomass efficiently extracts the energy stored in the chemical bonds and produces carbon dioxide and water. Generating energy and heat by burning biomass displaces more polluting forms of energy generation and also provides other environmental benefits, such as reducing acid rain, soil erosion, water pollution and pressure on landfills. Additional environmental benefits include mitigating climate changes, providing wildlife habitat, and helping to maintain forest health through better management.
  • Biomass fuel is both abundant and renewable. There is biomass in virtually every part of the world that can be tapped to create power. At present, the world population uses only about 7% of the available annual production of biomass. As a result, biomass is not only the logical alternative fuel of the future but is also currently a logical source of energy.
  • the present invention features a heating device comprising an electric resistance heater that is disposed within a low thermal conductivity enclosure or an enclosure having low thermal diffusivity.
  • an enclosure is configured so as to provide a high surface area which in combination with the heater heats the air passing through the enclosure.
  • such an enclosure is configured and arranged so as to include a through aperture in which is disposed the electric resistance heater and through which the air flows along the length of the through aperture.
  • An enclosure having low thermal conductivity or low thermal diffusivity is particularly advantageous as the heat energy being developed by the electric resistance heater is maintained in a location where it can be picked up by the air flowing through the through aperture/heating device.
  • the inner surface of the through aperture of the low thermal conductivity enclosure is configured with a plurality of convolutions or flutes that create hills and valleys that extend along the length of the enclosure.
  • the inner surface also is adaptable so as to present any of a number of configurations so as to adjust the performance of the heating device to suit a given application.
  • the low thermal conductivity enclosure is heated by convection and radiation by the electrical resistance heater, so that the inner surface of the enclosure is at a high temperature.
  • such a device further includes an outer member that surrounds the low thermal conductivity enclosure.
  • the low thermal conductivity enclosure is composed of a ceramic or other material that is appropriate for use under the temperature conditions for a heating device according to the present invention and which exhibit low thermal conductivity or low thermal diffusivity.
  • such materials can be porous or non-porous.
  • such materials also exhibit electrical insulating characteristics.
  • the electric resistance heater is characterized as being capable of reaching a high temperature and having a high watt density.
  • such electric resistance heaters include, but are not limited to hot surface igniters, silicon carbon igniters, silicon carbide hot surface igniters, ceramic/intermetallic hot surface igniters, silicon nitride igniters and other high wattage heating devices/elements.
  • hot surface igniters include Norton (St. Gobain Industrial Ceramics Norton Igniter Products) Mini Igniters®, Norton CRYSTAR Igniters®, Surface Igniters, hot surface igniters, and I 2 R hot surface igniters.
  • the heating tip or element thereof is heated by electricity to a desired temperature that will lead to the ignition of the biomass fuel.
  • Such an igniter typically includes a heating element that extends outwardly from an end of the base which it is secured to.
  • igniters from any one manufacturer because of its particular material composition, mass, and physical configuration, will generally heat up at a different rate to a different final temperature than an igniter from another manufacturer.
  • igniters from one manufacturer may heat up to a temperature of approximately 1600° F., in approximately 5 seconds, and to a relatively stable final temperature of approximately 2500° F. when energized for 20-30 seconds or longer.
  • the rate of temperature change and the final temperature attained also depends on the value of the applied voltage.
  • a heating element of the electric resistance heater is heated to a first temperature at or less than a first period of time and to a final temperature that is greater than the first temperature at or less than a second period of time.
  • the first temperature is at or above 1000° F. and the second temperature is at or about 2000° F.
  • the heating device is configured so as to include a plurality of electric resistance heaters or that are disposed within the ceramic enclosure.
  • a heating device is configured so as to include a plurality of low thermal conductivity enclosures and a plurality of electric resistance heating devices, at least one electric heating device for each enclosure.
  • the heating device of the present invention also is adaptable by increasing the size of the electric resistance heater, increasing the number of such resistance heaters within an enclosure, and increasing the number of enclosures and/or electric resistance heaters per enclosure so as to meet the heating requirements for a given application.
  • a heating device for larger size wood pellet (biomass) furnaces, one could configure a heating device to include two enclosures, each including an electric resistance heater, so as to provide sufficient heat energy to heat up the incoming air to the desired temperature within a desired period of time.
  • the air is heated up about twice as fast when using a heating device of the present invention as well as showing an increase in efficiency of about 15% in delivering the desired temperature.
  • a heating device of the present invention For example, for a given application using a wound wire resistance heater, it has taken 20 minutes for the heating device to heat air to the temperature necessary for causing the wood pellet (biomass) fuel to ignite.
  • the low thermal conductivity enclosure of the present invention exhibit resistance to thermal shock, such as that which occurs after energizing the electric resistance heaters contemplated for use with the present invention.
  • Such electric resistance heaters are designed to attain a high temperature very rapidly after being energized which can in turn shock the inner surface of the low thermal conductivity enclosure.
  • furnaces embodying such one or more of such heating devices and methods related thereto.
  • FIG. 1 is an illustrative view of an exemplary furnace having a combustion chamber, adapted to use a heating device of the present invention.
  • FIG. 2 is a partially cut away of the exemplary furnace of FIG. 1 .
  • FIG. 3 is an exploded illustrative view of a portion of the combustion chamber of the exemplary furnace of FIG. 1 .
  • FIG. 4 is one illustrative view of a resistance heater air heating device according to the present invention more particularly showing one end of such a device.
  • FIG. 5 is another illustrative view of the resistance heater air heating device of FIG. 4 more particularly showing another end of such a device.
  • FIG. 6 is a side view of the resistance heater air heating device of FIG. 4 .
  • FIG. 7 is a cross-sectional view along line 7 - 7 of FIG. 6 .
  • FIGS. 8A , B are end views respectively of the resistance heater air heating device of
  • FIG. 4 FIG. 8A
  • the resistance heater air heating device of FIG. 5 FIG. 8B
  • FIG. 9 is an view of a cross-section of a resistance heating device according to another embodiment of the present invention with the electric resistance heating element removed for clarity.
  • FIG. 10 is an illustrative view of the resistance heating device of FIG. 9 .
  • FIG. 1 an illustrative view an exemplary furnace 100 having a combustion chamber 110 in which is located a resistance heater air heating device 500 of the present invention.
  • the furnace 100 includes a housing 120 and the combustion chamber 110 is within the housing 120 .
  • at least a portion of the combustion chamber 110 a viewable through a window 122 , which is sealed with respect to the housing 120 .
  • the housing 120 also includes an access panel 124 that allows access to a portion of the interior of the furnace 100 located below the combustion chamber.
  • the access panel in some embodiments, allows users to remove combustion products from the furnace 100 . As shown more clearly in FIG.
  • the housing 120 also includes a hopper and a feed mechanism for controllably placing biomass combustibles into the combustion chamber 110 .
  • the housing 120 of the furnace includes a door 126 that allows access to the hopper (not shown in FIG. 4 ).
  • Biomass fuels are placed into the hopper after opening door 126 .
  • Any type of biomass can be used as a fuel.
  • corn, wood chips, or pellets of biomass material are among the fuel sources.
  • the exemplary furnace 100 shown in FIG. 1 is a space heater application, other applications include, but are not limited to a forced air furnace, a hot water heater, an electrical generator, a swimming pool heater, or for heating water for circulation within a hot water heating system.
  • the furnace includes a housing 120 and includes a hopper 420 which holds fuel 426 .
  • a feed mechanism 430 Positioned within the hopper is a feed mechanism 430 which is attached to a motor 432 .
  • the feed mechanism 430 can be termed as a feeder wheel which has slots therein. A portion of the fuel 426 falls within the slots while the motor 432 turns the feeder wheel to move the fuel in the slots from the lower portion of the hopper to a feeder tube 440 .
  • the feeder tube is a tube that connects the hopper 420 to the combustion chamber 110 .
  • the feeder tube 440 is positioned so that the fuel within a slot drops through the feed tube 440 and into a burn pot 300 within the combustion chamber 110 .
  • the rate at which the fuel is input to the combustion chamber and specifically to the burn pot 300 can then be controlled by controlling the motor 432 which rotates or turns the feeder mechanism or feeder wheel 430 .
  • the furnace or stove 100 also includes a controller 500 which controls many aspects of the stove or furnace. The controller 500 , for example, controls the rate at which fuel is input into the burn pot 300 .
  • FIG. 2 there is shown an exploded illustrative view of a portion of the combustion chamber 110 and the burn pot 300 of the furnace 100 .
  • the combustion chamber 110 is bounded by a top burner plate assembly 210 and a bottom plate 220 .
  • the combustion chamber also includes a back wall 212 .
  • Attached to the bottom plate 220 is a first pin 222 and a second pin 224 .
  • the burn pot 300 includes a first burn pot portion 310 and a second burn pot portion 320 .
  • the first burn pot portion includes a side wall 312 , which has openings, such as opening 314 therein, for directing combustion air around the burn pot 300 .
  • the second portion of the burn pot 320 also has a side wall 322 .
  • the sidewall 322 also includes openings, such as opening 324 , for directing air entering from outside the burn pot 300 to within the burn pot assembly.
  • a mounting wing 326 is also attached to the side wall 322 of the second burn pot portion 320 .
  • the mounting wing 326 includes openings that allow the mounting wing 326 to fit over the first pin 222 and the second pin 224 attached to the bottom plate 220 of the combustion chamber 110 .
  • Attached to the side wall 312 of the first burn pot portion is another mounting wing 316 , which has opening therein so that the mounting wing 316 also fits over the first pin 222 and the second pin 224 of the bottom plate 220 of the combustion chamber 110 .
  • the movable floor includes a grill 242 and an opening 244 .
  • the movable floor 240 is attached to a pivot pin 245 so that the moving floor 240 can pivot around the pivot pin 245 .
  • the translating plate 250 also has an opening 254 therein.
  • the translating plate 250 also includes a solid surface area 252 .
  • the translating plate 250 also is pivotally attached to the pivot pin 245 .
  • An actuator rod 400 is attached to the movable floor 240 as well as the translating plate 250 .
  • the actuator rod 400 is used to move the movable floor 240 and the translating plate 250 between a first position and a second position. In some embodiments, separate actuator rods are used to move the movable floor 240 and the translating plate 250 .
  • tow igniters 260 and an igniter 262 are attached to the burn pot 300 , and specifically to the second portion of the burn pot 320 .
  • the igniters 260 , 262 place heated air into the burn pot 300 and thus, the igniters 260 , 262 are in fluid communication with the interior portion of the burn pot assembly.
  • the igniters 260 , 262 are used to initially fire the furnace or to initially ignite biomass fuel added to the burn pot 300 . In further embodiments, once the biomass fuel within the burn pot has been started, the igniters 260 , 262 no longer place heated air into the burn pot 300 .
  • the combustible product tray 270 Positioned below the bottom plate 220 is a combustible product tray 270 .
  • the combustible product tray 270 includes a floor 272 as well as at least one side wall. Attached to the floor 272 of the combustible product tray 270 is a distributor 274 .
  • the distributor 274 is positioned so that when a portion of an ash column is removed from the burn pot 300 , the distributor 274 prevents the product from merely stacking up on the floor 274 of the combustible product tray 270 . In other words, the distributor 274 distributes the byproduct of combustion from the burn pot over the floor 272 of the combustible product tray 270 .
  • the grill 242 When in a first position, the grill 242 having openings therein of the movable floor 240 , the second portion of the burn pot 320 , the opening 254 in the translating plate 250 , and the first portion of the burn pot 310 are substantially aligned to form the burn pot 300 .
  • the biomass material can be inserted into the burn pot 300 and specifically can drop to the grill portion 242 of the movable floor 240 .
  • the igniters 260 , 262 are turned on to initially ignite the biomass material. Once the biomass material is burning, additional biomass material is placed through an opening 211 in the top burner plate assembly 210 and into the burn pot 300 .
  • Combustion air can be forced through the openings 314 within the first burn pot portion 310 and through the openings 242 in the second burn pot portion 320 , respectively, to provide sufficient oxygen for the biomass fuel to burn completely.
  • an ash column builds within the burner pot 300 .
  • the ash column eventually builds up to a point where the ash column is above the second portion of the burn pot 320 , and above the translating plate 250 .
  • Each of the igniters 260 , 262 can be arranged so as to embody the resistance heater air heating device 500 of the present invention which heating device is configured and arranged so to heat incoming air to a temperature that eventually causes the biomass material to ignite and eventually reach a sustained combustion. After the biomass reaches a sustained combustion, the furnace control circuitry cause the resistance heater air heating device 500 of the present invention to be turned off.
  • FIGS. 4-8 there are shown one illustrative view of a resistance heater air heating device 500 according to the present invention showing one end of such a device ( FIG. 4 ); another illustrative view of the resistance heater air heating device showing another end of such a device ( FIG. 5 ); a side view of the resistance heater air heating device of FIG. 4 ( FIG. 6 ); a cross-sectional view along line 7 - 7 of FIG. 6 ( FIG. 7 ) and end views respectively of the resistance heater air heating device of FIG. 4 ( FIG. 8A ) and the resistance heater air heating device of FIG. 5 ( FIG. 8B ).
  • Such a resistance heater air heating device 500 includes an outer member 510 , an electric resistance heater 530 and a low thermal conductivity enclosure 520 in which is disposed at least the heating element 534 of the electric resistance heater.
  • Such a resistance heater air heating device 500 also is configured so as to include one or more air vents or passages in addition to the open ends 512 a,b so that a source of air enters into the device and exits the device after being heated by the electric resistance heater 530 in combination with the low thermal conductivity enclosure 520 .
  • the electric resistance heater 530 is characterized as being capable of reaching a high temperature and having a high watt density.
  • such electric resistance heaters 530 include, but are not limited to, hot surface igniters, silicon carbon igniters, silicon carbide hot surface igniters, ceramic/intermetallic hot surface igniters silicon nitride igniters and other high wattage heating devices/elements.
  • hot surface igniters include Norton (St. Gobain Industrial Ceramics Norton Igniter Products) Mini Igniters®, Norton CRYSTAR Igniters®, Surface Igniters, hot surface igniters, and I 2 R hot surface igniters.
  • the heating tip or heating element 534 is heated by electricity to a desired temperature such as for example, a temperature necessary to cause a fuel/air mixture to ignite.
  • a desired temperature such as for example, a temperature necessary to cause a fuel/air mixture to ignite.
  • Such an igniter typically includes a heating element 534 that extends outwardly from an end of the base 532 which it is secured to.
  • igniters from any one manufacturer because of its particular material composition, mass, and physical configuration, will generally heat up at a different rate to a different final temperature than an igniter from another manufacturer.
  • igniters from one manufacturer may heat up to a temperature of approximately 1600° F., in approximately 5 seconds, and to a relatively stable final temperature of approximately 2500° F. when energized for 20-30 seconds or longer.
  • the rate of temperature change and the final temperature attained also depends on the value of the applied voltage.
  • a single electric resistance heater 530 is shown disposed in the low thermal conductivity enclosure, this shall not be limiting. It is contemplated and thus within the scope of the present invention for one or more, e.g., a plurality, of electric resistance heaters 530 to be located within the through aperture 526 of the low thermal conductivity enclosure 530 .
  • the resistance heater air heating device 500 of the present invention can be adapted for use with any of a number of surface heating igniters or heaters as is known to those skilled in the arts. Also it is contemplated such a resistance heater air heating device 500 also can be adapted for use with any of number of electric resisting heating elements as is known to those skilled in the art.
  • the low thermal conductivity enclosure 520 or an enclosure that exhibits low thermal diffusivity is configured and arranged so the heat energy being generated by the electric resistance heater 530 is contained in the area between the enclosure and the electric resistance heater and so as to be exposed to the flow of air. As shown more clearly in FIGS. 7-8 , the low thermal conductivity enclosure is configured and arranged so as to include a through aperture 526 in which is disposed the electric resistance heater 530 and through which the air flows along the length of the through aperture.
  • An enclosure having low thermal conductivity or low thermal diffusivity is particularly advantageous as the heat energy being developed by the electric resistance heater is maintained in a location where it can be picked up by the air flowing through the through aperture/heating device.
  • such an enclosure 520 is configured so as to provide a high surface area which in combination with the heater heats the air passing through the enclosure.
  • the inner surface of the through aperture 526 of the low thermal conductivity enclosure is configured with a plurality of convolutions or flutes that create hills 522 and valleys 524 that extend along the length of the enclosure.
  • the inner surface of the through aperture 526 is adaptable so as to present any of a number of configurations to adjust the performance of the heating device to suit a given application.
  • the low thermal conductivity enclosure 520 is composed of a material such that the inner surface of the through aperture thereof, is heated by one of convection or radiation by the electrical resistance heater, so that the inner surface is at a high temperature. In this way, the air as it passes along the through aperture is not significantly cooled by the low thermal conductivity enclosure 520 .
  • the inner surface is maintained at a temperature such that the air is heated by the inner surface.
  • the low thermal conductivity enclosure 520 is composed of a low thermal conductivity ceramic such as for example, low density cordierite (e.g., a density cordierite tube) or other material that is appropriate for use under the temperature conditions for a heating device according to the present invention and which other material exhibits low thermal conductivity or low thermal diffusivity.
  • a low thermal conductivity ceramic such as for example, low density cordierite (e.g., a density cordierite tube) or other material that is appropriate for use under the temperature conditions for a heating device according to the present invention and which other material exhibits low thermal conductivity or low thermal diffusivity.
  • such materials can be porous or non-porous.
  • such materials also exhibit electrical insulating characteristics so as to provide protection from electrical shock.
  • the outer member 510 is configured and arranged so as that it surrounds the low thermal conductivity enclosure 530 .
  • the outer member 510 is a metallic member (e.g., stainless steel) that is appropriate for the intended use and provides some protection to the low thermal conductivity enclosure 520 disposed therein.
  • the outer member 510 and the low thermal conductivity enclosure 520 are arranged so that an outer surface of the low thermal conductivity enclosure is in contact with an inner surface of the outer member.
  • the outer member 510 and the low thermal conductivity enclosure 520 are configurable so that the outer surface of the low thermal conductivity enclosure 520 is spaced from the inner surface of the outer member 510 .
  • FIGS. 9 and 10 there are shown various views of a resistance heater air heating device 600 according to another embodiment of the present invention.
  • a resistance heater air heating device 600 includes a plurality of low thermal conductivity enclosures 620 a,b that are located within an outer member 610 .
  • one or more electric resistance heaters 630 are disposed in the through aperture 626 a,b of the corresponding low thermal conductivity enclosure.
  • the configuration and arrangement of the low thermal conductivity enclosure 520 , 620 (e.g., size and shape) alone or in combination with the electric resistance heater 530 , 630 (e.g., power output and size) are selectable and adaptable so as to allow the resistance heater air heating device 500 , 600 of the present invention to be easily adapted for use in any of a number of applications, including those not specifically for a biomass furnace.
  • a furnace such as that described herein which embodies any of the above-described resistance heater air heating devices 500 , 600 of the present invention for purposes of igniting the biomass fuel (e.g., wood pellets) being burnt within the furnace.
  • biomass fuel e.g., wood pellets
  • methods for igniting biomass fuel using the above-described resistance heater air heating devices 500 , 600 and the steps described above for igniting the fuel are featured.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Solid-Fuel Combustion (AREA)
US12/562,718 2008-09-18 2009-09-18 Resistance heater based air heating device Abandoned US20100116182A1 (en)

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US19264108P 2008-09-18 2008-09-18
US12/562,718 US20100116182A1 (en) 2008-09-18 2009-09-18 Resistance heater based air heating device

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US11125439B2 (en) 2018-03-27 2021-09-21 Scp Holdings, An Assumed Business Name Of Nitride Igniters, Llc Hot surface igniters for cooktops

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US11493208B2 (en) 2018-03-27 2022-11-08 Scp Holdings, An Assumed Business Name Of Nitride Igniters, Llc Hot surface igniters for cooktops
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