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<br /> <br /> <br />t II. OXY's MODIFIED IN-SITU PROCESS <br /> The modified in-situ process is the <br />tensive field testing and basically consists result of 4-1/2 <br />of creating an years of ex- <br />underground <br /> chimney of broken oil shale by expanding the oil shale into a previously <br /> mined out void volume utilizing conventional explosives. A predetermined <br /> void volume is mined out either under, or through, the oil s hale deposit <br /> depending on the height and other geological conditions. <br /> Retorting is initiated by heating the rubble pile at the top of <br /> the retort using an outside energy source. After a short period of time <br /> the outside energy is discontinued and the combustion process is maintained <br /> by introducing air or an air/recycle mixture to the retort. The residual <br />~ , carbon becomes the major fuel required for retorting. The combustion zone <br /> moves slowly downward, and the oil produced in the retorting zone flows by <br /> gravity to the bottom of the retort where it is collected in a sump and <br /> pumped to storage. <br /> The off gas may be burned in a turbine for electric power gener- <br /> ation, or used for steam generation. About 258 of the generated electric <br /> power would be used to operate the in-situ process, and the other 758 would <br /> be exported to the Western Colorado power grid. <br /> <br />LJ <br /> <br /> <br /> <br /> <br /> <br /> <br />r -5 <br />