Iowa State University Research Foundation Inc

Frontline Bioenergy, LLC

Jerod Smeenk

Robert C Brown

Thomas J Paskach

Corey Wistrom

A method and assembly for producing substantially tar free product gas from gasification of carbonaceous material. The assembly preferably includes a first stage gasifier to produce char-ash and tar laden product gas and a second stage gasifier which has a char-ash heating zone, at least one cyclone, and at least one standpipe for the purpose of allowing selective delivery of char-ash to the char-ash heating zone. A char-ash heating zone that utilizes oxidation of char-ash is preferred and this results in the heat required to convert tar, additional yield of product gas, and an oxidized, activated carbon surface to facilitate tar conversion in the riser, thereby reducing the temperature required to achieve the desired tar conversion. Alternatively, external heat is supplied to the heating zone.

Method and apparatus for reduction of tar in gasification of carbonaceous materials

A method and apparatus for filtering gas () with a moving granular filter bed () involves moving a mass of particulate filter material () downwardly through a filter compartment (); tangentially introducing gas into the compartment () to move in a cyclonic path downwardly around the moving filter material (); diverting the cyclonic path () to a vertical path () to cause the gas to directly interface with the particulate filter material (); thence causing the gas to move upwardly through the filter material () through a screened partition () into a static upper compartment () of a filter compartment for exodus () of the gas which has passed through the particulate filter material ().

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Ames, IA, United States of America

Jerod Smeenk