Aspects of the invention relate to improvements in the flexibility with which oxygen and hydrogen, for example from electrolysis, may be supplied to processes having both gasification and methanation steps, as well as improvements in how such processes may be operated in response to variations in carbonaceous feeds. Offsets, between the ideal quantity of hydrogen and the quantity available from a given source may be compensated for by adjusting one or more operations of the process, and in particular such operation(s) that ultimately impact the quantity of CO and/or CO.sub.2 available downstream of the gasifier for conversion to methane in an RNG product stream.

A gasification system and a method for gasifying a particulate carbonaceous fuel are disclosed. The gasification system has a gasification chamber with an upper section and a lower section with a fuel inlet for injecting a particulate carbonaceous fuel and oxidant into the upper section whereby, in a thermo-chemical reaction, synthesis gas and residual char is generated. The gasification system further includes a separator configured to receive the synthesis gas and to separate residual tar form the synthesis gas. Further, there is a char bed disposed in the lower section formed by residual char generated in the thermo-chemical reaction and a gas-inlet at a bottom portion of the lower section for injecting gas into the char bed. The residual tar is injected into the char bed whereby, in a thermal cracking process, the residual tar is converted into synthesis gas. Hereby, it is possible to utilize the otherwise lost energy contained in the residual tar, and thereby achieve better efficiency in a gasification system, in a cost-effective and simple manner.

A system for removing impurities from post-combustion gas includes an oxidizer and a reducer operatively connected to the oxidizer, the reducer configured to receive the post-combustion gas. The system further includes a CLOU material capable of selective circulation between the oxidizer and reducer. The CLOU material further oxidizes impurities present in the post-combustion gas to reduce or remove the same.

A syngas production system includes a gasification reactor and a syngas pressure vessel downstream of the gasification reactor. The syngas pressure vessel includes a pressure vessel having a body with a first portion and a second portion. The syngas pressure vessel also includes an evaporator disposed in the pressure vessel; a coil disposed in the pressure vessel; and a tongue-and-groove flange assembly. The tongue-and-groove flange assembly includes: a first flange with a raised ring extending from a face of the first flange, the first flange attached to the first portion of the body; a second flange with a groove defined in a face of the second flange. The second flange is attached to the second portion of the body. The raised ring extends from the face of the first flange and is positioned in the groove defined in the face of the second flange.

The invention provides a hydrogen boiler based on coal gasification and water decomposition, including a steam boiler which includes an upper furnace and a lower furnace; water and steam in the upper furnace are respectively communicated with water and steam in the lower furnace; and the steam boiler is provided with a casing which has a narrow gap for containing water and a wide wall for heating to generate gas. The steam boiler contains multistage reactors. A coal modification and gasification device is provided at an outer side of the steam boiler and is provided with two chambers. The steam and gasified gas of coal are mixed and enter the reactors for direct burning to promote respective reactions. After several stages of modification and decomposition, the steam and the gasified gas of coal are completely converted to hydrogen.

A syngas generator has at least pyrolysis unit and a cracking unit which recycles treated input therein. The pyrolysis unit may recycle treated char to provide input heat for feedstock. The cracking unit may recycle syngas to assist in treating input gas/vapor mixture.

A process for the conversion of a petroleum feed to light olefins may comprise pretreating the petroleum feed to form one or more pretreated petroleum feeds and fractionating the one or more pretreated petroleum feeds to form a methane stream, an ethane stream, a C.sub.3-C.sub.4 stream, a light liquid fraction, and a heavy liquid fraction. The process may further comprise methane cracking the methane stream to form hydrogen, steam cracking the ethane stream to form a steam cracking product; dehydrogenating the C.sub.3-C.sub.4 stream to form a dehydrogenated stream; and steam enhanced catalytic cracking (SECC) the light liquid fraction and the heavy liquid fraction to form an SECC product.

An integrated process for upgrading a hydrocarbon oil feed stream utilizing a gasification unit and steam enhanced catalytic cracker includes solvent deasphalting the hydrocarbon oil stream to form at least a deasphalted oil stream and heavy residual hydrocarbons, the heavy residual hydrocarbons including at least asphaltenes; processing the heavy residual hydrocarbons in a gasification unit to form syngas and gasification residue; hydrotreating the deasphalted oil stream to form a light C.sub.5+ hydrocarbon stream, and a heavy C.sub.5+ hydrocarbon stream; steam enhanced catalytically cracking the light C.sub.5+ hydrocarbon stream to form a light steam enhanced catalytically cracked product stream including olefins, benzene, toluene, xylene, naphtha, or combinations thereof; and steam enhanced catalytically cracking the heavy C.sub.5+ hydrocarbon stream to form a heavy steam enhanced catalytically cracked product including olefins, benzene, toluene, xylene, naphtha, or combinations thereof.

Syngas is alternatingly introduced by a syngas alternating lead-in system through either of one- and the other-end-side heat storage bodies into flow passages in a primary reforming furnace, and oxidant is alternatingly supplied to the syngas by a primary-oxidant alternating supply system. The syngas derived from the primary reforming furnace by a syngas alternating lead-out system is introduced into a secondary reforming furnace to which connected is a secondary-oxidant supply system for supply of oxidant only at alternation in the syngas alternating lead-in and -out systems.

The present invention provides a method and system for preparing fuel gas by utilizing an organic waste with high water content. The method comprises the following steps: 1) providing an organic waste with high water content; 2) performing hydrothermal reaction by using the organic waste with high water content as a reactant to obtain a hydrothermal reaction product; 3) enabling the hydrothermal reaction product to generate steam, and separating a solid product and an oily liquid product in the hydrothermal reaction product; 4) performing gasification reaction by using the solid product, the oily liquid product and the steam as reactants to obtain a gasification reaction product; and 5) purifying the gasification reaction product to obtain clean fuel gas. The present invention further provides a system for preparing fuel gas. The method can be used for preparing clean fuel gas from the organic waste with water content of 60% or more.