An engine for propelling vehicles on land, in the air and on the water. The engine is able to extract energy from a same fuel twice, including extracting a first amount of energy with a gas turbine and a second amount of energy by burning the fuel in a combustion engine.

A clean energy system, a renewable energy system or a zero emission energy system (ZEES) to utilize CO.sub.2 waste. The energy system may include a fuel processor, an energy catalytic reactor, and a power generator. The fuel processor may catalytically convert the CH.sub.4 component in the natural gas, biogas or syngas into a reformate including H.sub.2, CO, CO.sub.2 and H.sub.2O species. The energy reactor may convert the reformate in gas form into a liquid fuel. The power generator may generate power using an output of the fuel processor and/or an output of the energy reactor.

A clean energy system, a renewable energy system or a zero emission energy system (ZEES) to utilize CO.sub.2 waste. The energy system may include a fuel processor, an energy catalytic reactor, and a power generator. The fuel processor may catalytically convert the CH.sub.4 component in the natural gas, biogas or syngas into a reformate including H.sub.2, CO, CO.sub.2 and H.sub.2O species. The energy reactor may convert the reformate in gas form into a liquid fuel. The power generator may generate power using an output of the fuel processor and/or an output of the energy reactor.

The energy conversion device includes liquid dielectric as a capacitor. The energy of the liquid dielectric capacitor is consumed inside the capacitor for use in engines, welding, or producing buoyancy gas, or consumed outside the capacitor for use as an on-board capacitor for a vehicle. The liquid dielectric capacitor is considered a dielectric breakdown-inducing igniter as an alternative to the conventional spark plug. In order to utilize the principle of this igniter as an energy source for an engine, a welding device or a gas production device for a buoyancy bag used to lift off seabed resources, an electric charge is applied to a liquid dielectric thin layer, then the thickness of the liquid dielectric thin layer is brought close to zero to cause dielectric breakdown, or the thickness of the liquid dielectric thin layer is increased to create a high voltage source for an on-board capacitor for a vehicle.