The purpose of this document is to present the assumptions and calculations used to prepare Minergy Drawing 100-0204-PP00 (attached). The volumetric flows for both a fluid bed combustor (FBC) and Minergy’s patented GlassPack® closed loop oxygen enhanced combustion process are compared on this drawing. In this drawing, process flows are illustrated by scaling the width of the flow arrows in direct proportion to the volumetric flow rates associated with each process as calculated below.
A sludge processing rate of 100 US dry tons per day of sludge (90.9 metric tons per day) was selected as a representative processing rate for this analysis for both technology options. Both options assume the same dry basis chemical analysis of the sludge. Feed stock was assumed to be undigested sludge with a carbon content of 40%, hydrogen content of 5%, nitrogen content of 5%, and oxygen content of 25% with a balance of ash at 25%. This analysis is typical of many undigested sludges currently found in the United States at this time.
FLUID BED COMBUSTOR PROCESS
The percent total solids content of the sludge fed to the FBC is assumed to be 25%, typical for many belt filter presses or centrifuge type dewatered sludges in the United States. The average dry basis feed to the FBC is therefore 3,788 kg/hr (90.9 dry metric tons per day).