An improved gas fireplace hearth provides a controller and can perform new features. A pressure sensor may be provided to communicate to the controller to warn of a drop of inlet gas pressure to indicate a problem with gas service rather than the hearth. An ambient temperature sensor can provide an input to the controller for various features including a safety feature to shut off gas flow if the hearth becomes too hot. The hearth can be made more efficient by having the controller implement a zero voltage alternating current system to adjust the speed of the fan, flame height, lighting, BTU output or other feature.

A system for controlling digital gas valves of an appliance utilizing a configurable duty cycle that includes a configurable ON time, a configurable cycle period and one or more configurable burner power level variables. In some instances, the configurable duty cycle may be configured at least in part by operation of a control knob, and in some instances, multiple burner power levels may be specified such that cycling may be performed between multiple burner power levels.

A system for controlling digital gas valves of an appliance utilizing a configurable duty cycle that includes a configurable ON time, a configurable cycle period and one or more configurable burner power level variables. In some instances, the configurable duty cycle may be configured at least in part by operation of a control knob, and in some instances, multiple burner power levels may be specified such that cycling may be performed between multiple burner power levels.

The method is for controlling a deflagration combustion process in a pistonless combustor. The method includes scavenging combustion products of the previous cycle, introducing air into the combustor thereby initiating a flow pattern having a first flow component within the combustor. Air is introduced into the pistonless combustor in a nonparallel angle in relation to the previous air input and thereby creating a second flow component to the flow pattern for increasing speed of combustion propagation. Fuel mixed into the air is introduced for creating a fuel-air mixture flowing within the flow pattern, and igniting the fuelair mixture within the pistonless combustor thereby increasing pressure within the pistonless combustor.

Methods and systems for a flame display may comprise flowing fuel from a fuel source to a burner via an electric valve fuel passage that includes an electric valve and via a mechanical valve fuel passage that includes a mechanical valve, receiving a flame boost mode request, and adjusting the electric valve to a wide open position. The flame display may further be operated in a music mode in which the electric valve is adjusted based on an audio input or in a standard mode.

A system for controlling a boiler in a power plant to ensure combust under optimized conditions is provided. The system for controlling an operation of the boiler may include an optimizer configured to perform a combustion optimization operation for the boiler using a boiler combustion model to calculate an optimum control value for at least one control object of the boiler, and an output controller configured to receive the calculated optimum control value from the optimizer and control the control object according to the optimum control value.

A controller memorizes an accumulated combustion time by accumulating combustion time of a burner, and is set in a first lower-limit and a second lower-limit higher than the first lower-limit as a lower-limit lower than an initial value of an excess air ratio when reducing an excess air limit of a mixture gas of combustion air and a fuel gas, and the former is the lower-limit in case the accumulated combustion time is under a predetermined set time and the latter is the one in case the accumulated combustion time is the predetermined set time and over.

This combustion adjustment method applied to the combustion control of a combustor executes a first step for selecting a combustion parameter for a load of a gas turbine and increasing or decreasing a command value of the combustion parameter from an original location. When the command value reaches a target tolerance upper limit value or a target tolerance lower limit value, the first step is terminated. Furthermore, a second step for decreasing or increasing the command value in a direction opposite to that of the first step is executed. When the command value reaches the target tolerance upper limit value or the target tolerance lower limit value, the present invention includes a combustion tolerance confirmation step for confirming a combustion tolerance range of the combustion parameter at which the second step is terminated.

A combustion apparatus (1) has a burner (11) configured to burn combustion gas, a heat exchanger (12) disposed below the burner (11), and a combustion fan (13) configured to supply air for combustion, wherein the combustion apparatus performs post-purge operation in which the combustion fan (13) is activated for a predetermined period of time after combustion operation of the burner (11) stops, and intermittent blower operation in which activation and deactivation of the combustion fan (13) is repeated a plurality of times at predetermined intervals after the post-purge operation ends.

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.