A boiler has a shell surrounding a vertical centerline. The shell defines an inner surface having an inner diameter and an inner length extending between an upper upstream end and a lower downstream end. The inner surface defines a hollow interior, the boiler having a pre-combustion zone, a combustion zone downstream from the pre-combustion zone, and a post-combustion zone downstream from the combustion zone. The shell is tapered outward along its length in at least a portion of the combustion zone. An oxidizer inlet is in fluid communication with the pre-combustion zone, and a fuel nozzle introduces fuel into the combustion zone. A tube assembly is mounted in the hollow interior of the shell for transferring heat to fluid flowing through the tube assembly. A flue duct is in fluid communication with the post-combustion zone for transporting flue gases from the hollow interior.

A turbocharged burner has a burning unit and a turbocharger. The burning unit is installed with a fuel bucket for storing fuel and a burning chamber having a tubular shape, and interior of the burning chamber is installed with at least one nozzle. At least one fuel tube coupled to the fuel bucket is disposed at each nozzle, and the turbocharger is coupled to the burning chamber. Under the reaction of the turbocharger, the gas fluid of the burning chamber is increased, a flowing speed and a flowing flux of the gas fluid are increased, and thus the burning further entirely achieves the objective of increasing fuel burning efficiency.

Method for operating a gas burner appliance (10). During burner-on-phases a gas/air mixture having a defined mixing ratio of gas and air is provided to a burner chamber (11). Said gas/air mixture is provided by a mixing device (23) mixing an air flow with a gas flow. Said mixing device (23) has at least two Venturi nozzles being connected in parallel. Said air flow is provided by a fan (14) in such a way that the fan speed of the fan (14) depends on a desired burner load. The fan speed range of the fan (14) defines a modulation range of the gas burner appliance (10). Said defined mixing ratio of gas and air of the gas/air mixture is controlled over the modulation range of the gas burner appliance (10) by a gas regulating valve (18). Said gas regulating valve (18) has a pneumatic controller (24) controlling the mixing ratio of gas and air on basis of a pressure difference between the gas pressure of the gas flow in the gas pipe (16) and a reference pressure. During burner-on-phases the combustion quality is monitored on basis of a signal provided by a combustion quality sensor. The defined mixing ratio of gas and air of the gas/air mixture can be calibrated during on basis of the signal provided by the combustion quality sensor, namely by adjusting during calibration a position of a throttle (17). The calibration of the gas/air mixture is performed in such a way that for calibration at least one of the Venturi nozzles (28) of the mixing device (23) is closed while at least one of the Venturi nozzles (28) of the mixing device (23) is opened.

Exemplary embodiments of a system and method for bimodal air control in a kettle-style grill are configured to be detachably mounted to the exterior of a kettle-styled grill such as, but not limited to, a Weber charcoal grill. When mounted to the kettle-styled grill, a plenum-like component directs air flows to the interior of the grill's kettle via the kettle's lower body damper holes. A manually adjustable intake damper in the plenum component allows, restricts, or prevents a drawn ambient air flow into the plenum component. Separately, a forced air flow generated by a fan may also be provided into the plenum component. Adjustment of the intake damper may also adjust damper blades inside the grill's kettle. Ash that falls out of the kettle's damper holes falls through the plenum component and is captured in an ash receptacle that is removably mounted to the plenum component.

A liquid fuel air heater comprises a housing defining a motor housing portion and a grip portion extending from the motor housing portion. An electric motor is positioned in the motor housing portion. A combustion chamber is at least partially positioned within the motor housing portion. A fan is driven by the motor when activated for generating an axial airflow through the combustion chamber. A battery pack containing a plurality of battery cells connected to each other in a series or parallel arrangement is removably coupled to the grip portion of the housing for supplying power to the motor.

A booster burner of the present disclosure basically has a burning unit, an air blower disposed at a rear end of a burning chamber of the burning unit and a high-pressure gas providing unit; wherein the burning unit has a fuel bucket for storing fuel and a burning chamber having a tubular shape, interior of the burning chamber has at least one nozzle, at least one fuel tube coupled to the fuel bucket is disposed at each the nozzle; and the high-pressure gas supplying unit has a gas storage bucket for storing high-pressure gas, each the nozzle is installed with a high-pressure pipe coupled to the gas storage bucket. Through the high-pressure gas, the slight atomization and acceleration effect is applied to the fuel which enters the nozzle, such that fuel molecules are refined and more completely burned, and the objective of increasing the fuel burning efficiency is achieved.

A turbocharged burner has a burning unit and a turbocharger. The burning unit is installed with a fuel bucket for storing fuel and a burning chamber having a tubular shape, and interior of the burning chamber is installed with at least one nozzle. At least one fuel tube coupled to the fuel bucket is disposed at each nozzle, and the turbocharger is coupled to the burning chamber. Under the reaction of the turbocharger, the gas fluid of the burning chamber is increased, a flowing speed and a flowing flux of the gas fluid are increased, and thus the burning further entirely achieves the objective of increasing fuel burning efficiency.

A furnace including a housing and a firebox in the housing having a combustion chamber. The furnace includes a combustion air delivery system for delivering combustion air to the combustion chamber. The combustion air delivery system includes a manifold mounted outside the combustion chamber and extending vertically along the front face of the combustion chamber from a lower end to an upper end. An air blower is mounted on the manifold. The combustion air delivery system includes a primary combustion air passage for delivering air from the air blower to a primary combustion air outlet at the front face of the combustion chamber. The combustion air delivery system includes a secondary combustion air passage for delivering air to a secondary combustion air outlet positioned inside the combustion chamber adjacent the top face of the combustion chamber.

A furnace assembly comprising a non-condensing furnace with a draft inducer. The draft inducer includes a permanent magnet electrically commutated motor and a draft inducer blower fan. The motor includes a stator, a rotor, a motor cooling fan, and a controller. The rotor being rotatable relative to the stator, the fan being operatively coupled to the rotor such that rotation of the rotor causes rotation of the fan, the controller being configured to selectively operate the motor in first and second different torque ranges of the rotor, with the first and second torque range operating within a fixed percentage and within a fixed percentage of each other. The controller being configured such during normal operation, the motor is not operable at any torques between the first torque range and the second torque range except during transitionary periods.

A furnace assembly comprising a non-condensing furnace with a draft inducer. The draft inducer includes a permanent magnet electrically commutated motor and a draft inducer blower fan. The motor includes a stator, a rotor, a motor cooling fan, and a controller. The rotor being rotatable relative to the stator, the fan being operatively coupled to the rotor such that rotation of the rotor causes rotation of the fan, the controller being configured to selectively operate the motor in first and second different torque ranges of the rotor, with the first and second torque range operating within a fixed percentage and within a fixed percentage of each other. The controller being configured such during normal operation, the motor is not operable at any torques between the first torque range and the second torque range except during transitionary periods.