NOVELTY - A gas to liquid system (10) comprises an air separation unit (14) to separate oxygen from air; a gas processing unit (16) to prepare a fuel stream for combustion; a premixing device (24) to mix the fuel stream and oxygen to form a gaseous pre-mix; an energy source (26) to shift the equilibrium point of the gaseous pre-mix in a heat treatment zone (28) disposed downstream of the premixing device; and a combustion chamber (12) for combusting the gaseous pre-mix to produce a synthesis gas enriched with carbon monoxide.    USE - For producing a synthesis gas enriched with carbon monoxide which is useful for catalytically converting synthesis gas into a long-chain hydrocarbon fluids which are useful for producing useful product (e.g. synthetic diesel fuel, synthetic kerosene, ethanol, dimethyl ether, and/or naptha) (claimed).    ADVANTAGE - The system uses energy device which provides a local heat treatment for shifting an equilibrium point of the reaction substantially away from carbon dioxide thereby promoting formation of carbon monoxide in the exhaust gas. The localized heat treatment enhances the conversion efficiency of syngas generators for producing a syngas composition enriched with carbon monoxide. The local heat treatment of the exhaust gas facilitates dynamics stabilization, diagnostics and control of such systems.    DETAILED DESCRIPTION - A gas to liquid system (10) comprises an air separation unit (14) to separate oxygen from air; a gas processing unit (16) to prepare a fuel stream for combustion; a premixing device (24) to mix the fuel stream and oxygen to form a gaseous pre-mix; an energy source (26) to shift the equilibrium point of the gaseous pre-mix in a heat treatment zone (28) disposed downstream of the premixing device; and a combustion chamber for combusting the gaseous pre-mix to produce a synthesis gas enriched with carbon monoxide. The system further comprises a Fischer-Tropsch processing unit for receiving quenched synthesis gas and for catalytically converting the quenched synthesis gas into a long-chain hydrocarbon fluid; an upgrading unit for fractionating the long-chain hydrocarbon fluid into at least one useful product (e.g. synthetic diesel fuel, synthetic kerosene, ethanol, dimethyl ether, and/or naptha); and a control system configured to control operation of the energy source based upon a sensed parameter. The fuel stream comprises natural gas, tail gas, steam, and/or carbon dioxide (CO2). The premixing device comprises a flow conditioning device configured to pre-condition the fuel stream. The flow conditioning device comprises several swirler vanes to provide a swirl movement to the fuel stream. The energy source is configured to facilitate detection of an operational condition of the system, flame detection within the combustion chamber, or to ignite the gaseous premix and to facilitate flame stabilization in the system.    DESCRIPTION OF DRAWING(S) - The figure shows a diagrammatic view of a gas to liquid system having a syngas generator.    Gas to liquid system (10)    Air separation unit (14)    Gas processing unit (16)    Premixing device (24)    Energy source (26)    heat treatment zone. (28)