A fuel-fired device can include an air-moving device that mixes air and a fuel to generate a fuel-air mixture. The fuel-fired device can also include an air box that provides the air to the air-moving device, and a fuel valve that provides the fuel to the air-moving device, where the fuel valve includes a tracking port coupled to the air box, where the tracking port detects a pressure of the air box. The fuel-fired device can further provide a pressure-regulating device disposed between a pressurized component and the tracking port of the fuel valve. The flow regulating device can control, during an ignition phase of operation, an amount of the fuel provided by the fuel valve to the air-moving device.

An automatic pilot lighting system for unattended automatic lighting of a standing pilot may include a powered (e.g., battery powered, etc.) circuit. The powered circuit may include an analog timer circuit including a timer switch. A spark ignitor may be coupled with the timer switch. A temperature knob pilot momentary switch may be coupled with the timer switch. An ON/OFF switch may be coupled with the temperature knob pilot momentary switch and the timer switch. The ON/OFF switch may be configured to be operable for selectively disabling and enabling a power source. The analog timer circuit may be configured to be selectively activatable for applying voltage from the power source via the ON/OFF switch for pilot hold voltage and spark ignition for an amount of time sufficient to allow for unattended automatic lighting of the standing pilot and sufficient voltage generation to support standalone operation.

A low emissions modular flare stack includes a plurality of flare stack burner modules, each including a main fuel source configured to selectively deliver a main fuel stream for dilution by a flow of combustion air, a main igniter configured to cause ignition of the main fuel stream emitted from the main fuel source, a distal flame holder configured to hold a combustion reaction supported by the main fuel stream when the distal flame holder is at or above a predetermined temperature, and a pre-heating apparatus configured to pre-heat the distal flame holder to the predetermined temperature. The low emissions modular flare stack includes a common combustion air source configured to provide combustion air to each of the plurality of flare stack burner modules, and a wall encircling all of the plurality of flare stack burner modules, the wall being configured to laterally contain combustion products corresponding to all of the plurality of flare stack burner modules.

A hydrogen content fuel can be stably ignited using a gaseous fuel that does not contain hydrogen and dispersibility of the hydrogen content fuel is enhanced.

A gas turbine combustor including a burner including: a startup fuel pipe in which a startup fuel circulates; a first main fuel pipe in which a main fuel circulates, a second main fuel pipe in which the main fuel circulates; a fuel mixer to which the startup fuel pipe and the first main fuel pipe are connected; an inner fuel nozzle to which the fuel mixer is connected; a plurality of outer fuel nozzles to which the second main fuel pipe is connected; a startup fuel control valve provided in the startup fuel pipe; a first fuel control valve provided in the first main fuel pipe; and a second fuel control valve provided in the second main fuel pipe.

Example furnaces and methods related thereto include a burner box including at least one burner configured to combust a fuel/air mixture. In addition, the furnace includes a first blower including an inlet nozzle having an air inlet and fuel inlet. The inlet nozzle is configured such that operation of the first blower is to pull air and fuel into the inlet nozzle to produce the fuel/air mixture at a fuel/air ratio that is configured to produce flue products having less than 14 Nano-grams per Joule of nitrogen oxides when combusted. Operation of the first blower is configured to push the fuel/air mixture into the burner box. Further, the furnace includes a heat exchanger assembly fluidly coupled to the burner box through a vestibule, and a second blower configured to pull the flue products through the heat exchanger assembly.

A dual-gas source gas control system with anti-gas source misconnection and a control circuit thereof belonging to the gas combustion technical field are provided. The disclosure solves unreasonable design and other problems in the related art. The dual-gas source gas control system with anti-gas source misconnection and the control circuit thereof includes a power-on circuit, connected in series with an external power supply and an igniter switch to form a loop, including a self-locking switch triode connected in series with the external power supply and a self-locking amplifying triode connected to a base electrode of the self-locking switch triode; an MCU control circuit, including an MCU control chip, wherein the power-on circuit is connected to a power input pin of the MCU control chip, one pin on the MCU control chip is configured to detect whether the power-on circuit is connected.

A thermally-actuatable gas valve assembly comprising a ceramic heater is shown and described. The gas valve assembly comprises a housing with a gas inlet and a gas outlet. A bimetal thermal actuator has a valve plug that removably seals the gas outlet from the interior of the housing. The ceramic heater is energizable to cause the thermal actuator to deflect which unseats the valve plug from the gas outlet, thereby placing the gas outlet in fluid communication with the gas inlet and the interior of the housing. A gas heating system is also shown and described in which the gas valve assembly selectively supplies cooking gas to a silicon nitride ceramic igniter. The igniter and the heater are in series such that when a source of alternating current is applied across the igniter and the heater, the igniter reaches the autoignition temperature of the combustion gas before the valve assembly opens

Disclosed is an induced-draft gas-fired furnace that includes: an electronic furnace controller, a burner assembly, a gas valve, and an inducer motor, wherein the controller: accelerates the inducer motor at a first pre-ignition rate to a first pre-ignition speed; controls the gas valve to supply gas to the burner assembly to obtain a first pre-ignition ratio of fuel to air, operates an igniter to attempt to ignite the first fuel mixture, determines whether fuel has ignited in the burner assembly, wherein when fuel having the first pre-ignition ratio of fuel to air remains unignited after a plurality of ignition attempts, the controller: decelerates the inducer motor to a second pre-ignition rate to obtain a second pre-ignition speed and a second fuel mixture comprising a second pre-ignition ratio of fuel to air, and determines whether the second fuel mixture has ignited in the burner assembly.

A combustion system includes a perforated flame holder, a fuel nozzle configured to output fuel toward the perforated flame holder, and a plasma ignition device configured to output a plasma during a preheating state of the combustion system and to cease outputting the plasma to transition from the preheating state to the standard operating state. In the preheating state the plasma ignition device causes a preheating flame of the fuel stream at a position between the fuel nozzle and the perforated flame holder. In the standard operating condition, the plasma is not present and the fuel stream impinges on the perforated flame holder. The perforated flame holder supports a combustion reaction of the fuel stream within the perforated flame holder when in the standard operating state.

A method of controlling water heater pilot flame ignition includes receiving, by a controller of a water heater, a user input and controlling a pilot gas valve to start a gas flow to a pilot burner in response to the user input. The method further includes, in response to the user input, controlling, by the controller, an igniter to generate an ignition spark for lighting a pilot flame. The method also includes controlling, by the controller, the pilot gas valve to maintain the gas flow to the pilot burner if the pilot flame is lit.