公开(公告)号：US11248786B2

公开(公告)日：2022-02-15

申请号：US16728548

申请日：2019-12-27

Applicant: CLEARSIGN TECHNOLOGIES CORPORATION

Inventor： Douglas W. Karkow ,  Joseph Colannino ,  James K. Dansie ,  Jesse Dumas ,  Donald Kendrick ,  Christopher A. Wiklof

IPC: F23D11/44 ,  F23N5/24 ,  F23N5/02 ,  F23D14/14 ,  F23D14/72 ,  F23D14/26 ,  F23D9/00 ,  F23D11/38

Abstract: A method for a combustion system includes outputting fuel from an adjustable-position fuel nozzle onto a perforated flame holder, the fuel being directed for mixture with an oxidant en route to the perforated flame holder. A combustion reaction of the fuel and the oxidant is supported within the perforated flame holder. A position of the adjustable-position fuel nozzle may be changed relative to the flame holder. A first flow of fuel may be output when the adjustable position fuel nozzle is in an extended state, and a second flow of fuel may be output when the adjustable-position fuel nozzle is in a retracted state.

公开(公告)号：US12066248B2

公开(公告)日：2024-08-20

申请号：US17014589

申请日：2020-09-08

Applicant: ClearSign Technologies Corporation

Inventor： Douglas W. Karkow ,  James K. Dansie ,  Venkatesh Iyer ,  Donald Kendrick ,  Colin James Deller ,  Christopher A. Wiklof

IPC: F27B17/00 ,  F23C5/08 ,  F23D11/40 ,  F23D14/14 ,  F23D14/70 ,  F23D14/72 ,  F23Q9/00 ,  F27D1/00

CPC classification number: F27B17/0016 ,  F23C5/08 ,  F23D11/406 ,  F23D14/145 ,  F23D14/70 ,  F23D14/72 ,  F23C2900/05081 ,  F23Q9/00 ,  F27D2001/0059

Abstract: A combustion system includes a fuel and oxidant source, a first distal flame holder body, a second distal flame holder body, and a thermal load. The fuel and oxidant source outputs fuel and oxidant. The first and second distal flame holder bodies simultaneously or alternately hold combustion reaction portions of the fuel and oxidant and/or of combustion products. The thermal load receives thermal energy from the first and second combustion reaction portions.

公开(公告)号：US11953201B2

公开(公告)日：2024-04-09

申请号：US16746743

申请日：2020-01-17

Applicant: ClearSign Technologies Corporation

Inventor： Douglas W. Karkow ,  Donald Kendrick ,  James K. Dansie ,  Christopher A. Wiklof

IPC: F23D14/82 ,  F23D14/22 ,  F23D14/32 ,  F23D14/58 ,  F23N5/00 ,  F23N5/24 ,  F23R3/18

CPC classification number: F23D14/825 ,  F23D14/22 ,  F23D14/32 ,  F23D14/58 ,  F23N5/242 ,  F23N5/006 ,  F23R3/18

Abstract: A combustion system includes a distal flame holder, a pilot fuel distributor, a main fuel distributor, an oxidant source, an array of sensors, and a controller. The oxidant source outputs an oxidant. The pilot fuel distributor supports a pilot flame configured to preheat the distal flame holder by outputting a pilot fuel at least when the combustion system is in a preheating state. The main fuel source outputs a main fuel in the standard operating state. The distal flame holder is configured to support a combustion reaction of the main fuel and the oxidant in the standard operating state. The sensors are configured to sense parameters of the pilot flame and the distal flame holder and to output sensor signals to the controller. The controller executes software instructions that include adjusting the flow of the main fuel, the pilot fuel, and the oxidant responsive to the sensor signals.

公开(公告)号：US11953199B2

公开(公告)日：2024-04-09

申请号：US17658248

申请日：2022-04-06

Applicant: CLEARSIGN TECHNOLOGIES CORPORATION

Inventor： James K. Dansie ,  Douglas W. Karkow ,  Jesse Dumas ,  Donald Kendrick ,  Sunny Karnani ,  Christopher A. Wiklof

IPC: F23D11/40 ,  F23D14/14 ,  F23D14/70 ,  F23M9/06

CPC classification number: F23D11/406 ,  F23D14/14 ,  F23D14/145 ,  F23D14/70 ,  F23M9/06 ,  F23C2203/10 ,  F23C2203/20 ,  F23D2203/102 ,  F23D2203/104 ,  Y02E20/30

Abstract: A combustion system includes a fuel and oxidant source that outputs fuel and oxidant, a first perforated flame holder, and a second perforated flame holder separated from the first perforated flame holder by a gap. The first and second perforated flame holders sustain a combustion reaction of the fuel and oxidant within the first and second perforated flame holders.

公开(公告)号：US20210190310A9

公开(公告)日：2021-06-24

申请号：US16777826

申请日：2020-01-30

Applicant: ClearSign Technologies Corporation

Inventor： Colin James Deller ,  Donald Kendrick ,  Venkatesh Iyer ,  Douglas W. Karkow

IPC: F23C9/08 ,  F23D14/04 ,  F23D14/64 ,  F23D14/82 ,  F23Q9/00 ,  F23D14/26 ,  F23D14/14 ,  F23C6/04 ,  F23K5/00 ,  F23L7/00

Abstract: A burner includes a distal flame holder, first and second fuel nozzles, a fuel and oxidant source, and a mixing tube disposed upstream from the distal flame holder. Fuel emitted from the first fuel nozzle mixes with oxidant from the oxidant source to form a fuel and oxidant mixture to support combustion in the distal flame holder. A non-reactive fluid source such as recirculated flue gas provides a non-reactive fluid for dilution of the fuel and oxidant mixture to prevent flashback.

公开(公告)号：US12050151B2

公开(公告)日：2024-07-30

申请号：US17135884

申请日：2020-12-28

Applicant: ClearSign Technologies Corporation

Inventor： Robert Geiger ,  Jackson Matthew Pleis ,  Donald Kendrick ,  Christopher A. Wiklof

IPC: F23N1/02 ,  F23D11/40 ,  F23D14/14 ,  F23N5/02 ,  F23N5/12 ,  F23N5/18 ,  G01M15/14 ,  G01N33/00

CPC classification number: G01M15/14 ,  F23D11/406 ,  F23D14/145 ,  F23N1/022 ,  F23N5/022 ,  F23N5/123 ,  F23N5/184 ,  G01N33/0027 ,  G01N33/0062 ,  G01N33/0073 ,  F23D2208/10 ,  F23D2212/103 ,  F23N2237/26

Abstract: A burner includes a flame sensor configured to detect at least one of permittivity, capacitance, or resistance across a flame region. The permittivity, capacitance, or resistance is used to determine the presence or absence of the flame in a combustion system. A combustion system supports a combustion reaction. The combustion system utilizes a combustion sensor, and optionally a plasma generator to stabilize the combustion reaction. A controller receives sensor signals from the combustion sensor and controls the plasma generator to stabilize the combustion reaction responsive to the sensor signals. The plasma generator stabilizes the combustion reaction by generating a plasma.

公开(公告)号：US20200240628A1

公开(公告)日：2020-07-30

申请号：US16777826

申请日：2020-01-30

Applicant: ClearSign Technologies Corporation

Inventor： Colin James Deller ,  Donald Kendrick ,  Venkatesh Iyer ,  Douglas W. Karkow

IPC: F23C9/08 ,  F23D14/04 ,  F23D14/64 ,  F23D14/82 ,  F23Q9/00 ,  F23D14/26 ,  F23D14/14 ,  F23C6/04 ,  F23K5/00 ,  F23L7/00

Abstract: A burner includes a distal flame holder, first and second fuel nozzles, a fuel and oxidant source, and a mixing tube disposed upstream from the distal flame holder. Fuel emitted from the first fuel nozzle mixes with oxidant from the oxidant source to form a fuel and oxidant mixture to support combustion in the distal flame holder. A non-reactive fluid source such as recirculated flue gas provides a non-reactive fluid for dilution of the fuel and oxidant mixture to prevent flashback.

公开(公告)号：US20240200771A1

公开(公告)日：2024-06-20

申请号：US18513131

申请日：2023-11-17

Applicant: ClearSign Technologies Corporation

Inventor： Donald Kendrick ,  William A. Santana ,  Venkatesh Iyer

IPC: F23D14/26 ,  F23D14/02 ,  F23D14/48 ,  F23D14/70 ,  F23D14/84

CPC classification number: F23D14/26 ,  F23D14/48 ,  F23D14/70 ,  F23D14/84 ,  F23D14/02 ,  F23D2212/20 ,  F23D2900/00014

Abstract: According to embodiments, burner systems include a distal flame holder and distal pilot burner formed at least partially from shared structure.

公开(公告)号：US12007301B2

公开(公告)日：2024-06-11

申请号：US17135517

申请日：2020-12-28

Applicant: ClearSign Technologies Corporation

Inventor： Robert Geiger ,  Jackson Matthew Pleis ,  Donald Kendrick ,  Christopher A. Wiklof

IPC: G01M15/14 ,  F23D11/40 ,  F23D14/14 ,  F23N1/02 ,  F23N5/02 ,  F23N5/12 ,  F23N5/18 ,  G01N33/00

CPC classification number: G01M15/14 ,  F23D11/406 ,  F23D14/145 ,  F23N1/022 ,  F23N5/022 ,  F23N5/123 ,  F23N5/184 ,  G01N33/0027 ,  G01N33/0062 ,  G01N33/0073 ,  F23D2208/10 ,  F23D2212/103 ,  F23N2237/26

Abstract: A system for measuring a fuel-oxidant equivalence ratio includes at least one wall defining a gas volume including fuel and air. A gas ionization source is configured to cause a formation of ions in the gas. A power supply is configured to output a time-varying voltage. A first electrode is disposed in the gas volume, operatively coupled to the power supply, and configured to carry the time-varying voltage. A second electrode is arranged to operatively couple to a signal output by the first electrode after the signal passes through the gas volume. Characteristics of the received signal indicate the fuel-oxidant equivalence ratio.

公开(公告)号：US11906160B2

公开(公告)日：2024-02-20

申请号：US16678120

申请日：2019-11-08

Applicant: ClearSign Technologies Corporation

Inventor： Donald Kendrick

IPC: F23D14/64 ,  F23C9/00 ,  F23D11/10 ,  F23D11/40 ,  F23D14/02 ,  F23D14/70 ,  F23D17/00

CPC classification number: F23D14/64 ,  F23C9/00 ,  F23D11/103 ,  F23D11/402 ,  F23D14/02 ,  F23D14/70 ,  F23D17/00 ,  F23D2203/007 ,  F23D2203/10 ,  F23D2203/102 ,  F23D2204/00 ,  F23D2212/101

Abstract: A combustion system includes a fuel distributor configured to output a fuel, an oxidant source configured to output an oxidant, and a mixing tube defining a mixing volume aligned to receive the fuel and oxidant. The mixing tube is shaped to convey the fuel and the oxidant through the mixing volume at a bulk velocity higher than a flame propagation speed. The combustion system includes a flame holder aligned to receive the mixed fuel and oxidant and to support a combustion reaction of the fuel and the oxidant.