The present disclosure provides a process for controlling syngas composition from an internal combustion engine-based syngas generator. While air is typically used as an oxidant, with nitrogen (N.sub.2) as a diluent, this results in expensive downstream compression, and low feedstock conversion efficiencies. This disclosure provides CO.sub.2 as a diluent to reduce N.sub.2 concentration in the syngas. In some embodiments, the CO.sub.2 diluent may be from either a biogas processing coupled with methanol, DME, and/or hydrocarbon production; or natural gas processing coupled with Fischer-Tropsch (FT) synthesis and/or other hydrocarbon synthesis.

There are provided systems and methods for using fuel-rich partial oxidation to produce an end product from waste gases, such as flare gas. In an embodiment, the system and method use air-breathing piston engines and turbine engines for the fuel-rich partial oxidation of the flare gas to form synthesis gas, and reactors to convert the synthesis gas into the end product. In an embodiment the end product is methanol.

A reforming system may include an engine combusting reformed gas to generate mechanical power, an intake line connected to the engine to supply reformed gas and air to the engine, an exhaust line connected to the engine to circulate exhaust gas exhausted from the engine, a reformer provided at an exhaust gas recirculation (EGR) line diverging from the exhaust line and mixing the exhaust gas with fuel to reform the fuel mixed with the exhaust gas, a temperature sensor provided in the reformer and measuring temperature of the reformer, and a reforming controller determining whether the reformer operates or not based on driving condition of the engine and temperature of the reformer.

A reformer-liquid fuel manufacturing system that utilizes an engine to generate hydrogen-rich gas is disclosed. The engine operates at very rich conditions, such as 2.5<<4.0. In doing so, it creates an exothermic reaction, which results in the production of syngas. In addition, the system utilizes the energy from the exothermic reaction to rotate a shaft and also utilizes the heat in the syngas to heat the reactants. A mechanical power plant is in communication with the rotating shaft and can be used to produce oxygen, provide electricity or operate a compressor, as require. The hydrogen-rich gas is supplied to a chemical reactor, which converts the gas into a liquid fuel, such as methanol.

There are provided systems and methods for using fuel-rich partial oxidation to produce an end product from waste gases, such as flare gas. In an embodiment, the system and method use air-breathing piston engines and turbine engines for the fuel-rich partial oxidation of the flare gas to form synthesis gas, and reactors to convert the synthesis gas into the end product. In an embodiment the end product is methanol.

Methods and systems are provided for the conversion of waste plastics into various useful downstream recycle-content products. More particularly, the present system and method involves pyrolyzing one or more waste plastics into various pyrolysis products, including a carbon solids-containing pyrolysis residue, and then subjecting the pyrolysis residue to partial oxidation gasification to thereby form a syngas composition.