Patent ID: 8623277

Claim:
An apparatus comprising: (a) a continuously controlled vapor control valve installed in a vapor fuel line through which saturated vapor fuel is extracted from a saturated liquid-vapor mixture; (b) a continuously controlled liquid control valve installed in a liquid fuel line through which saturated liquid fuel is extracted from the saturated liquid-vapor mixture; (c) a pressure sensor to sense a flamer fuel system pressure value; (d) a controller having the sensed flamer fuel system pressure as an input and having as a first output, a vapor control valve position set point, not limited to only open and closed, and having as a second output, a liquid control valve set point, not limited to open and closed; (e) a control algorithm in the controller to calculate the first output and the second output as functions of the input flamer fuel system pressure to maintain the flamer fuel system pressure at a pressure set point value; (f) a flow sensor for sensing a fuel flow of the flamer fuel; (g) a multivariable control algorithm programmed in the controller having the saturated mixture flamer fuel system pressure and the fuel flow as inputs and the vapor control valve position set point and the liquid control valve set point as outputs; (h) a fuel tank containing the fuel in the saturated liquid-vapor mixture form; (i) a flamer having at least one burner at which a flame caused by a combustion of the fuel is held; and (j) a hood for containing heat created by the burner.