Derrick shaker is in general located in the lower section of the retort. In such a place, the oil shale is contacted with more shale shaker hot gas, steam and air so as to gasify and burn the residual carbon as well as char. Processed shale via Derrick shaker can be discharged from the bottom even when the oil recoveries are relatively low. This is mainly because the Derrick shaker equipment is rugged and its availability is high in most cases but its thermal efficiency should be slightly higher than in the conventional retort. Fine oil shale Derrick shaker and some of the solid products are currently wasted, according to leading shale shaker producers who run two plants that use Derrick shaker retorts and history of shale shake. In fact, the plants are planning to increase shale oil Derrick shaker production with a different retort so as to make better use of fine oil shale particles by mixing them with hot spent shale in an inclined rotary Derrick shaker. Oil vapor is withdrawn in the first place in Derrick shaker and can be condensed to yield liquid fuel as long as the Derrick shaker fraction is considered a medium energy fuel gas. Retorted shale Derrick shaker can be used to burn the hot ash that is returned to the retort via a heat carrier since the surplus gases and some of the heavier oil fractions will be burned to produce electric power in Derrick shaker.
Oil quality is good while Decanter centrifuge thermal efficiency and oil recovery ratios are high in history of shale shake. However, the Derrick shaker equipment is complicated and capacity factors are relatively low since the retorts can be operated at a large scale for more than twenty years. However, the Derrick shaker performance characteristics should be well understood so as to deal with expected technical risk that should be lowered. The cutting edge shale shaker has been developed primarily so as to process a range of tar sands and the processor consists of two horizontal concentric tubes that rotate together. Oil shale is charged into one end of the Derrick shaker inner tube and moves in a horizontal manner to the other end of that tube. After that, it is transferred to the Derrick shaker outer tube and moves backwards between the tubes before it is discharged when it reaches the Derrick shaker feed end. Retorting heat is provided by transferring part of the hot burned Derrick shaker shale into the inner tube where it contacts the incoming fresh oil shale in a direct manner. The wall between the Derrick shaker tubes is heated by contacting the retorted oil shale and the gases, which also is transferred to the feed material.