A process for preparing fuel gas through gasification of powdered coal, comprising: contacting powdered coal and ash residue in a riser reactor under hydrogenation conditions to perform a pyrolysis reaction and a gas-phase tar cracking reaction; subjecting it to a primary gas-solid separation to obtain a gasified gas and a solid fraction; subjecting the gasified gas to a secondary gas-solid separation to obtain a solid fraction containing fine particle semi-coke and a gasified gas; subjecting the solid fraction to a gasification calcination reaction, flowing the gasified coal gas and the high-temperature ash residue u into the riser reactor; subjecting the solid fraction containing fine particle semi-coke to a melting gasification reaction, falling the liquid residue to the material-returning device of fluidized bed for cooling and solidification, and feeding the second high-temperature gasified coal gas to the riser reactor via a high-temperature gasified gas returning pipe.

A process for preparing fuel gas through gasification of powdered coal, comprising: contacting powdered coal and ash residue in a riser reactor under hydrogenation conditions to perform a pyrolysis reaction and a gas-phase tar cracking reaction; subjecting it to a primary gas-solid separation to obtain a gasified gas and a solid fraction; subjecting the gasified gas to a secondary gas-solid separation to obtain a solid fraction containing fine particle semi-coke and a gasified gas; subjecting the solid fraction to a gasification calcination reaction, flowing the gasified coal gas and the high-temperature ash residue u into the riser reactor; subjecting the solid fraction containing fine particle semi-coke to a melting gasification reaction, falling the liquid residue to the material-returning device of fluidized bed for cooling and solidification, and feeding the second high-temperature gasified coal gas to the riser reactor via a high-temperature gasified gas returning pipe.

A process for preparing fuel gas through gasification of powdered coal, comprising: contacting powdered coal and ash residue in a riser reactor under hydrogenation conditions to perform a pyrolysis reaction and a gas-phase tar cracking reaction; subjecting it to a primary gas-solid separation to obtain a gasified gas and a solid fraction; subjecting the gasified gas to a secondary gas-solid separation to obtain a solid fraction containing fine particle semi-coke and a gasified gas; subjecting the solid fraction to a gasification calcination reaction, flowing the gasified coal gas and the high-temperature ash residue u into the riser reactor; subjecting the solid fraction containing fine particle semi-coke to a melting gasification reaction, falling the liquid residue to the material-returning device of fluidized bed for cooling and solidification, and feeding the second high-temperature gasified coal gas to the riser reactor via a high-temperature gasified gas returning pipe.

An autothermal process of concentric bubbling fluid double bed for the production of syngas by gasification with biomass steam, in the presence of a granular material includes: continuous gasification under stationary bed condition of said granular material in bubbling fluidisation regime of biomass with water vapour with thermochemical transformation of the fuel into raw syngas and char, the raw syngas including heavy hydrocarbons in the steam state and any harmful compounds in traces, in a first reaction volume; combustion in bubbling fluidised bed with air of the char and of auxiliary fuel in a second reaction volume; the transfer velocity of the granular material between the first and second reaction volumes being such that the thermal difference does not exceed 20 C.; separation from the raw syngas by hot filters; and elimination of any harmful compounds in traces.

An autothermal process of concentric bubbling fluid double bed for the production of syngas by gasification with biomass steam, in the presence of a granular material includes: continuous gasification under stationary bed condition of said granular material in bubbling fluidisation regime of biomass with water vapour with thermochemical transformation of the fuel into raw syngas and char, the raw syngas including heavy hydrocarbons in the steam state and any harmful compounds in traces, in a first reaction volume; combustion in bubbling fluidised bed with air of the char and of auxiliary fuel in a second reaction volume; the transfer velocity of the granular material between the first and second reaction volumes being such that the thermal difference does not exceed 20 C.; separation from the raw syngas by hot filters; and elimination of any harmful compounds in traces.

A method for processing meat-and-bone meal for obtaining ashes includes steps of: feeding a catalytic fluidized bed gasifier with a meat-and-bone meal and an orthosilicate with a gas stream comprising oxygen, for obtaining a synthetic gas stream and ashes, wherein the catalytic fluidized bed gasifier is at a temperature from 400 C. to 1000 C.; grinding the obtained ashes; feeding a thermal boiler with the ground ashes, the obtained synthetic gas and a gas stream comprising oxygen for separating the ashes from the orthosilicate, wherein the thermal boiler is at a temperature from 600 C. to 2000 C.; and collecting the separated ground ashes.

A chemical looping gasification method for iron-rich sludge is provided, in which the iron-rich sludge is sequentially subjected to pressure filtration and crushing to obtain an iron-rich sludge particle with a moisture content of 40-50%. The iron-rich sludge particle and an iron-based oxygen carrier are subjected to a chemical looping gasification reaction in a fluidized bed reactor to form a sludge ash as a supplementary oxygen carrier. The chemical looping gasification is then performed with the supplementary oxygen carrier, the oxygen carrier and unreacted iron-rich sludge particle, while the iron-rich sludge gasification process, the produced syngas is rich in hydrogen and could be used as fuel.

A chemical looping gasification method for iron-rich sludge is provided, in which the iron-rich sludge is sequentially subjected to pressure filtration and crushing to obtain an iron-rich sludge particle with a moisture content of 40-50%. The iron-rich sludge particle and an iron-based oxygen carrier are subjected to a chemical looping gasification reaction in a fluidized bed reactor to form a sludge ash as a supplementary oxygen carrier. The chemical looping gasification is then performed with the supplementary oxygen carrier, the oxygen carrier and unreacted iron-rich sludge particle, while the iron-rich sludge gasification process, the produced syngas is rich in hydrogen and could be used as fuel.

A chemical looping gasification method for iron-rich sludge is provided, in which the iron-rich sludge is sequentially subjected to pressure filtration and crushing to obtain an iron-rich sludge particle with a moisture content of 40-50%. The iron-rich sludge particle and an iron-based oxygen carrier are subjected to a chemical looping gasification reaction in a fluidized bed reactor to form a sludge ash as a supplementary oxygen carrier. The chemical looping gasification is then performed with the supplementary oxygen carrier, the oxygen carrier and unreacted iron-rich sludge particle, while the iron-rich sludge gasification process, the produced syngas is rich in hydrogen and could be used as fuel.

A chemical looping gasification method for iron-rich sludge is provided, in which the iron-rich sludge is sequentially subjected to pressure filtration and crushing to obtain an iron-rich sludge particle with a moisture content of 40-50%. The iron-rich sludge particle and an iron-based oxygen carrier are subjected to a chemical looping gasification reaction in a fluidized bed reactor to form a sludge ash as a supplementary oxygen carrier. The chemical looping gasification is then performed with the supplementary oxygen carrier, the oxygen carrier and unreacted iron-rich sludge particle, while the iron-rich sludge gasification process, the produced syngas is rich in hydrogen and could be used as fuel.