Abstract
A method to completelt utilize digester gas has been studied and designed by the Metropolitan Sanitary District of Greater Chicago at its West-Southwest Plant. Data on the amount of gas produced, utilized, and wasted are compiled for one year on monthly basis. The dollar value of the wasted gas is determined in equivalent cost of natural gas. Three alternatives for the utilization of wasted gas are considered, namely: gas turbine generation, internal combustion engine prime mover, and low-pressure steam boilers. A study of low-pressure steam sources and steam demand at the west-Southwest Plant is presented along with the design considerations for the selection of equipment for the system. Certain things peculiar to the West-Southwest Plant, such as existing available buildings, existing pipelines, and the future expansion of the plant were taken into account in designing the system.
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