Filtered fuel gas for pressurized fluid engine systems

In a natural gas driven fluid pressure engine system, the improvement comprising in combination:

• a source of raw natural gas under pressure at the wellhead, a fluid pressure engine, means for conveying the natural gas for fuel to the engine through a designated flow path, and a rotary dynamic turbine type centrifugal separator in the designated flow path for separating contaminants from the natural gas rotated by the flow of the gas, said separator being characterized by:
• a rotor shaft with a vertically disposed axis, a set of spaced generally vertically disposed rotor blades generally radially extending outwardly from the rotor shaft and disposed at an acute angle from the vertically disposed rotor axis in a generally cylindrical configuration, the blades thereby comprising ramp means for intercepting contaminants from the natural gas flow to direct them downwardly, a raw natural gas input port disposed at a lower cylindrical configuration location, and a decontaminated natural gas output port disposed at an upper cylindrical configuration location and spaced circumferentially about the cylindrical configuration in the direction of rotation to produce an upward spiral flow of the gas from the input port to the output port through the separator when the rotor is rotating.