Abstract
A decoupled dual-loop gasifier (DDLG) has been developed in which biomass gasification and hot gas upgrading are separated into two parallel loops so that they can be optimized individually. In the gasification loop, the gasifier is designed so that the contact between volatiles and char is restrained and, therefore, the steam gasification of char is enhanced. In the upgrading loop, both a desulfurizer and a tar-reforming catalyst are used for desulfurization and tar destruction, respectively. As the in-bed desulfurizer, an iron-bearing olivine-supported ZnO (Zn/olivine) material was prepared and tested in a fixed-bed reactor. H2S sorption over ZnO, adversely affected by H2O, was accompanied by the evident reduction of ZnO and vaporization of Zn at 550 °C. In contrast, no obvious ZnO reduction was observed under the same conditions over Zn/olivine. The reduction resistance of Zn/olivine was investigated by means of temperature-programmed reduction and powder X-ray diffraction. In DDLG tests with pine sawd...
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