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generates an off -gas that contains burnable gases (e.g., hydrogen and carbon <br />monoxide) that can be used off -site, it can be classified as a gasifier. <br />1.2.1 Gasification <br />Gasification is the heating of an organic waste (MSW) to produce a burnable gas <br />(approximately 85 percent hydrogen and carbon monoxide mix) for use off -site. <br />While pyrolysis systems are primarily focused on waste destruction, a gasifier is <br />designed primarily to produce a usable gas. As shown in Figure B -7, Thermoselect, a <br />European firm represented in the U.S. by InterCity Waste Technologies of Malvern, <br />PA, has developed a system composed of 400 TPD modules processing MSW. <br />Figure B -7. Typical Gasification System9 <br />Waste is fed into a gasification chamber to begin the heating process, after being <br />compressed to remove entrapped air. Some oxygen; sufficient only to maintain the <br />heat necessary for the process to proceed, is injected into the reactor where <br />temperatures in excess of 3,000 °F are generated. At this high temperature, organic <br />materials in the MSW will dissociate into hydrogen, methane, carbon dioxide, water <br />vapor, etc., and non - organics will melt and form a glass -like slag. After the gas is <br />cleaned, water is removed, and the gas can be used for power generation, heating, <br />or other purposes. The glass -like slag can be used as fill, or as a building material <br />for roads, etc. <br />A variation of the fluid bed incineration system described in this section is the <br />fluidized -bed gasifier, shown in Figure B -8. <br />9 Source: International Waste Technologies, Malvern, PA. <br />GBB /C08027 -01 B -10 August 15, 2008 <br />