Provided is a water heater including a burner that receives a supply of combustion air from a fan, a heat exchanger having a heat transfer tube, and a combustion chamber case in which a combustion chamber of the burner is formed in the interior thereof and which is to be capable of guiding combustion gas generated by the burner to the heat exchanger. The water heater further includes a unit case that surrounds the combustion chamber case, and a region on the outside of the combustion chamber case within the unit case serves as an air pressure chamber having a higher pressure than the combustion chamber. Thus, combustion gas leakage to the outside can be prevented or suppressed appropriately by means of a simple configuration.

Boiler systems and associated control systems, methods for operating same, are described herein. In one example embodiment, a boiler system includes a furnace, an exhaust passage, an air passage, a FGR passage, a flue gas valve that is adjustable by way of a first actuator, a NO.sub.X gas sensor, an oxygen gas sensor, and an additional valve that is adjustable by way of a second actuator. Further, the boiler system includes at least one processing device coupled to the NO.sub.X gas sensor, the oxygen gas sensor, the first actuator and the second actuator. The at least one processing device is configured to generate control signals that are provided to the first actuator and second actuator, and also configured to generate correction factors by way of a calibration process and to utilize one or more of the correction factors in determining one or more of the control signals.

A burner assembly having a blower housing, a blower to supply air to the burner assembly, a blast tube having a longitudinal axis, a fuel source to supply fuel to the burner assembly, a center tube that is substantially parallel to the longitudinal axis and conveys air and fuel to a center tube burner end opening, a plurality of premix tubes, each of which is substantially parallel to the longitudinal axis and conveys air and fuel to a premix tube burner end opening, a diffuser that is disposed in the center tube near the center tube burner end opening, a nozzle that is disposed in the center tube substantially perpendicular to the diffuser. The center tube air and fuel mixture is fuel rich and the premix tubes air and fuel mixture is fuel lean. A method for burning the center tube air and fuel mixture and the premix tubes mixtures.

A high temperature combustion device is provided that is configured to enable dynamic changes in the combustion environment to provide neutral, oxidizing, or reducing combustion environments. The device may include a blast tube and an air blower configured to motivate air through the blast tube. A nozzle for atomizing a fuel, such as vegetable oil, and more preferably waste vegetable oil, may be disposed in the blast tube. A fuel pump may be configured to motivate the fuel to exit the nozzle. An air supply line may be in fluid communication with the nozzle and may be configured to supply high-pressure air to the nozzle. The high-pressure air may exit the nozzle with the fuel in a first direction, and air motivated through the blast tube by the air blower may pass around the nozzle in a second direction that is substantially parallel to the first direction.

The present invention provides a combustion device, which includes a fuel tank assembly and a candle wick. The fuel tank assembly includes a first tank, a second tank, a connection tube, and a switch. The capacity of the second tank is less than the capacity of the first tank. An end of the connection tube is connected to the first tank, and another end of the connection tube is connected to the second tank. The connection tube communicates with internal spaces of the first and second tanks. The switch is disposed between the first and second tanks so as to selectively open or close a channel interconnected between the first and second tanks. The candle wick is mounted in the second tank. Therefore, the combustion device is easy to use by the above structure.

Generally described, a heating device, or heating tube, includes a combustive fluid inlet, respectively a combustible fluid inlet, is connected to a combustion head via a first pipe, respectively a second pipe, the second pipe being housed at least partially in the first pipe. In this heating device, the combustion head is distant of at least 50 cm from the combustible fluid inlet, which enables to create a cold zone between the two. The first and the second pipes enable to bring the combustible fluid and the combustive fluid separately to the combustion head, even if the latter is remote by at least 50 cm from the combustible fluid and combustive fluid inlets.

Heating oil is delivered to homes and commercial establishments in a regulation-confirming way by using a portable, self-contained, self-powered apparatus which is carried on a lighter weight truck as cargo. The portable apparatus comprises a skid upon which is mounted at one end a tank, a pump, an air-vapor eliminator, a meter subsystem, and a hose reel mounted on a stanchion. A battery power supply powers the pump. Vent lines run to the tank from the vapor eliminator and the pump in what is called a closed system. Apparatus components are arranged to provide a weight distribution lengthwise that is biased toward a one end of the apparatus when the tank is filled with oil. When carried as cargo in a three-quarter ton pickup truck, apparatus with oil weighs less than 1,500 pounds; when carried as cargo in a half ton pickup truck, the apparatus with oil weighs less than 1,000 pounds.

The present invention provides a fuel incinerating system comprising a fuel injector, a multi-stage fuel-air mixing device comprising a plurality of fuel intake tubes stacked vertically and configured to provide annular gaps between one or more of the vertically stacked fuel intake tubes to entrain ambient air to form a fuel-air mixture; and a combustor in communication with the fuel-air mixing device and defining a combustion chamber and in communication with an ignition source. The combustor is configured to impede flow of the fuel-air mixture through the combustion chamber to achieve a desired retention time of the fuel-air mixture within the combustion chamber to achieve substantially complete combustions of the fuel.

A combustion air proving system is provided for a burner assembly having a burner for providing heat to a location, a controller, and a back plate. Outside air is fed to the burner via a conduit, and is connected to an inlet of the system. An outlet of the system is connected to the burner via the back plate. A damper within the system is translatable between open and closed positions for allowing and blocking air flow, respectively. A sensor measures an air flow parameter of air flow to the burner. The sensor communicates with the controller, which shuts down the burner if the parameter measured by the sensor meets a predetermined threshold value. An assembly installer may test for proper sensor and controller functions by translating the damper to the closed position and blocking outside air flow.

A burner includes: an inner gas nozzle which extends along an axis while surrounding the axis, and which is capable of supplying a furnace with an inner combustion oxygen containing gas; a fuel supply nozzle surrounding the inner gas nozzle as seen in a direction along the axis, the fuel supply nozzle being capable of supplying the furnace with a fluid mixture of a solid powder fuel and a carrier gas; an outer gas nozzle surrounding the fuel supply nozzle as seen in the direction along the axis, the outer gas nozzle being capable of supplying the furnace with an outer combustion oxygen containing gas; and a flow-velocity-ratio adjustment apparatus capable of adjusting a relative flow velocity ratio of a discharge flow velocity of the inner combustion oxygen containing gas to a discharge flow velocity of the outer combustion oxygen containing gas.