A multistaged lean prevaporizing premixing fuel injector apparatus is provided. The fuel injector may be utilized with a turbogenerator. Preheated combustion air from the turbogenerator's recuperator may be utilized by the fuel injector to prevaporize liquid fuel. The injector may provide for premixing of multiple fuel streams and include multiple stages with a flow distributor plate separating adjacent stages. The injector may include multiple stages, with a pilot tube located in a final stage splitting the fuel stream into a premixed pilot stream and a premixed final fuel and air mixture stream.

A fuel plenum for a fuel nozzle assembly includes a gaseous fuel conduit, a conduit passage, and a liquid fuel conduit. Said gaseous fuel conduit received at a first end of said fuel plenum. Said fuel plenum is configured to distribute gaseous fuel received from said gaseous fuel conduit. Said conduit passage extends from the first end to a second end of said fuel plenum. Said conduit passage is at least partially defined by at least one interior wall of said fuel plenum. Said liquid fuel conduit defined by an outer wall and a portion of said liquid fuel conduit extending through said conduit passage. Said liquid fuel conduit outer wall is offset from said at least one interior wall.

The method can include injecting fuel from a liquefied fuel source into a combustion chamber having a combustion path, by circulating the fuel out from an inlet conduit into an evaporator housing, along the evaporator housing in a direction opposite the combustion path and across an evaporator element receiving fuel in the liquid state and exposing a multiplied surface of the liquid fuel to heat from the combustion path to evaporate the liquid fuel, and conveying the evaporated fuel into the combustion chamber and into the combustion path.

A heating apparatus using liquefied gas includes: a combustion unit where the liquefied gas is combusted in a vaporized state; a vaporization unit providing a vaporization space in which the liquefied gas supplied from a fuel receiving unit receiving the liquefied gas is vaporized and thermally separated from the combustion unit; and a thermoelectric element unit including a high-temperature input unit maintaining a high-temperature state by the combustion unit and a low-temperature input unit maintaining a relatively lower temperature than the high-temperature input unit by the liquefied gas vaporized in the vaporization unit and generating power by using a temperature difference between the high-temperature input unit and the low-temperature input unit, and the vaporization unit maintains a low-temperature state by using vaporization of the liquefied gas and is thermally separated from the combustion unit so as to prevent a temperature from rising by the combustion unit to increase power generation efficiency of the thermoelectric element unit.

A burner (20) includes a combustion unit (21), a fuel supply unit (22), a vaporizer (30), an air supply unit (45), and a control unit (50). The fuel supply unit (22) supplies fuel to the combustion unit (21). The vaporizer (30) uses an electric heater (32) to heat and vaporize fuel supplied from the fuel supply unit (22) to the combustion unit (21). The air supply unit (45) supplies air to the vaporizer (30). The control unit (50) controls the supply of fuel from the fuel supply unit (22), the supply of electrical power to the electric heater (32), and the supply of air from the air supply unit (45). The control unit (50) causes the air supply unit (45) to supply air while the supply of fuel from the fuel supply unit (22) is stopped. The control unit (50) supplies electrical power to the electric heater (32) and controls the temperature of the electric heater (32) so as to reach a combustible temperature at which fuel can combust.

A fuel oil provision-vaporization-pressure regulation-full premixed combustion system includes an air pump, a fuel tank, a vaporizing chamber, a preheater, a premix nozzle, an ignition device, a full premixed combustor and an intake guiding device. The air pump communicates with an air inlet of the fuel tank through a first conduit. The fuel tank is provided with a fuel inlet and a fuel outlet pipe. The fuel outlet pipe communicates with a fuel inlet of the vaporizing chamber through a second conduit. The vaporizing chamber is provided with the preheater. A fuel outlet of the vaporizing chamber is in communication with an air inlet of the premix nozzle through a third conduit. An air outlet of the premix nozzle opens to the intake guiding device. An outlet of the intake guiding device communicates with the full premixed combustor. The full premixed combustor is provided with the ignition device.