The present disclosure relates to a flue gas treatment system (e.g. a multi-pollutant flue gas treatment system) for removal of greenhouse gases such as SO.sub.2, NO, NO.sub.2, H.sub.2S, HCl, water and CO.sub.2 as well as heavy metals (e.g. mercury, arsenic, bismuth, cadmium, lead and/or selenium) from the flue gases of fossil-fueled utility and industrial plants by reacting the raw flue gas, firstly, with chlorine in a gas-phase oxidation reaction and recovering the resulting products as marketable products, and then, secondly, treating the cleaned gas, which includes CO.sub.2, with a Sabatier reaction to produce a hydrocarbon fuel (e.g. methane). The system also includes an electrolytic unit for electrolyzing HCl to produce hydrogen gas for the Sabatier reaction as well as chlorine gas, which may then be recycled into the reactor.

The present invention provides a blended fuel and methods for producing the blended fuel, wherein a low carbon fuel derived from a renewable resource such as biomass, is blended with a traditional, petroleum derived fuel. A blended fuel which includes greater than 10% by volume of low carbon fuel has an overall improved lifecycle greenhouse gas content of about 5% or more compared to the petroleum derived fuel. Also, blending of the low carbon fuel to the traditional, petroleum fuel improves various engine performance characteristics of the traditional fuel.

A method for providing a fuel includes providing a partially purified biogas at a first processing site, where the partially purified biogas is produced by multiple biogas sources and/or from multiple feedstock sources. The partially purified biogas is compressed, fed to a mobile tank, and transported by vehicle to a second processing site. At the second processing site, which may also receive biogas from a plurality of biogas sources, the partially purified biogas is further processed to produce a fuel or fuel intermediate.

The present disclosure provides a process for forming a biogenic carbon-based fuel or a fuel intermediate from biogenic carbon dioxide and hydrogen. The hydrogen is sourced from a process that produces hydrogen and fossil carbon dioxide from a fossil-fuel hydrocarbon and separates the fossil carbon dioxide from the hydrogen. The process may further comprise carrying out or arranging for one or more parties to carry out at least one step that contributes to a reduction in the GHG emissions of the biogenic carbon-based fuel, or a fuel made from the fuel intermediate, of at least 20% relative to a gasoline baseline. In various embodiments this includes (a) introducing the fossil carbon dioxide underground, and/or (b) using a biogenic carbon-based product selected from a chemical and energy product produced from the non-fossil organic material to displace the use or production of a corresponding fossil-based product.

A syngas generator is disclosed as an exothermic gas generator that is configured to accommodate high combustion temperatures of a natural gas/oxygen flame. The generator consists of four sections: a heavily insulated combustion chamber, a catalyst chamber, a spray chamber, and a heat exchanger. In an example embodiment, these four sections are arranged in series and are tightly bolted together to form a gas tight system. Natural gas, oxygen and steam are supplied to a burner at the inlet end of the combustion chamber. This mixture is ignited and the resulting hot process gas is then fed into a catalyst bed where it reacts with the steam and is converted to carbon monoxide and hydrogen (syngas). The syngas is fed to a Fischer-Tropsch unit to create liquid fuel.

The present invention provides a blended fuel and methods for producing the blended fuel, wherein a low carbon fuel derived from a renewable resource such as biomass, is blended with a traditional, petroleum derived fuel. A blended fuel which includes greater than 10% by volume of low carbon fuel has an overall improved lifecycle greenhouse gas content of about 5% or more compared to the petroleum derived fuel. Also, blending of the low carbon fuel to the traditional, petroleum fuel improves various engine performance characteristics of the traditional fuel.

An air-handling system is provided and includes an air-handling unit (AHU) which outputs exhaust air with relatively high CO.sub.2 content, a cooling tower, which is receptive of the exhaust air from the AHU and which is configured to cool water in the exhaust air and to output exhausted air with the relatively high CO.sub.2 content and relatively high water content, and a duct. The duct is receptive of the exhausted air from the cooling tower and includes an air-conversion element configured to convert the exhausted air into fuel and air with relatively low CO.sub.2 and water content and relatively high oxygen (O.sub.2) content. The duct is configured to direct the air into the AHU.

Disclosed is an apparatus and method of preparing synthetic fuel using natural gas extracted from a standard gas field on land or at sea as a raw material through a compact GTL process or a GTL-FPSO process. A parallel-type gas purification unit for controlling a molar ratio of synthetic gas and a concentration of carbon dioxide in the synthetic gas, in which a CO.sub.2 separation device and a bypass unit are disposed in parallel, is provided and, thus, the gas purification unit may prepare the synthetic gas by a steam carbon dioxide reforming (SCR) reaction using natural gas having different CO.sub.2 contents of various standard gas fields and then supply the synthetic gas having an optimum composition suitable for a Fischer-Tropsch synthesis reaction to prepare the synthetic fuel.

The invention discloses novel diesel fuel compositions including a renewable paraffinic diesel component, a fossil diesel component and an oxygenate component, as well as methods for manufacture and use of a combination of a renewable paraffinic diesel component, and an oxygenate component for reducing NOx emissions.

An apparatus for producing a natural gas using carbon dioxide and water in air that includes an air-compressing member, a water collecting member, a water storing member, a carbon dioxide collecting member, a water electrolysis member, and a methanation reaction member. The water electrolysis member electrolyzes water separated from compressed air. The methanation reaction member generates a natural gas by reacting hydrogen from the electrolysis and carbon dioxide from the carbon dioxide collecting member. A method of producing a natural gas using carbon dioxide and water in air includes supplying hydrogen electrolyzed from water separated from air and carbon dioxide collected from the dry air to a methanation reaction member to generate a natural gas. A natural gas-synthesizing equipment system includes an apparatus for producing a natural gas using carbon dioxide and water in air.