Method of gasifying carbonaceous material and a gasification system
AssigneeCurtin University of Technology
InventorsChun-Zhu Li, Hongwei Wu, Mohammad Asadullah, Xiaoshan Wang
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Abstract
A method of gasifying carbonaceous material is described. The method comprises a first step of pyrolyzing and partially gasifying the carbonaceous material to produce volatiles and char. The volatiles and the char are then separated and, subsequently, the char is gasified and the volatiles are reformed. The raw product gas is then finally cleaned with char or char-supported catalysts or other catalysts.
Claims27
A method of gasifying a carbonaceous material in a single gasification vessel that is coupled with hot gas cleaning, the method comprising the steps of:
- pyrolysing the carbonaceous material to produce volatiles and char;
- thereafter
- separating the char from the volatiles to minimize volatile-char interactions during the subsequent gasification of char and the subsequent reforming of volatiles;
- gasifying the char in a char gasification zone;
- reforming the volatiles to produce a product gas;
- and thereafter
- passing partially reformed volatiles and/or product gas through a product gas cleaning zone comprising a catalyst bed to remove organic and inorganic contaminants;
- wherein the single gasification vessel has a pyrolysis zone, the char gasification zone, and a reforming zone;
- wherein the pyrolysis zone is disposed intermediate to the reforming zone and the char gasification zone for the volatiles from the pyrolysis zone to ascend into the reforming zone, and wherein hot gas resulting from the gasification zone provides a heat source for pyrolysing the carbonaceous material in the pyrolysis zone.
A gasification system for gasifying a carbonaceous material, the gasification system comprising a single gasification vessel that is coupled with hot gas cleaning, wherein the single gasification vessel comprises:
- a reforming zone for reforming volatiles to produce a product gas;
- a char gasification zone for gasifying char;
- a pyrolysis zone for pyrolysing carbonaceous material, the pyrolysis zone being in fluid communication with the reforming zone and the char gasification zone in an arrangement whereby volatiles and char formed in the pyrolysis zone are separated and directed to the reforming zone and the char gasification zone, respectively, to minimize volatile-char interactions during the subsequent gasification of char and the subsequent reforming of volatiles;
- wherein hot gas resulting from the gasification zone provides a heat source for pyrolysing the carbonaceous material in the pyrolysis zone;
- and
- a product gas cleaning zone in fluid communication with the reforming zone in an arrangement whereby partially reformed volatiles and/or product gas are passed through a catalyst bed in the product gas cleaning zone to remove organic and inorganic contaminants.
An apparatus for pyrolysing and at least partially gasifying carbonaceous materials, the apparatus comprising:
- at least one element having a surface arranged such that, when the apparatus receives carbonaceous material, the received carbonaceous material is in contact with the surface for a time period of sufficient length so as to pyrolyse the carbonaceous material;
- wherein the apparatus is arranged such that the surface receives heat for pyrolysing and partially gasifying the carbonaceous material;
- and
- wherein hot gas resulting from gasifying the carbonaceous material provides the heat for pyrolysing the carbonaceous material.
Dependencies are inferred from the claim text.