Application of SGFM Technology to Alternate Feedstocks. Phase 3. Final Report, September 1, 1979-March 31, 1982

摘要

The major accomplishment of this project was the correlation of the SGFM gasifier yields as a function of average gasifier temperature, oxygen-to-feed ratio, steam-to-feed ratio and mean solids residence time (MSRT). Twenty-four runs on the PDU were used for these correlations. These runs were chosen based on adequate closure of the total mass balances, carbon balances, hydrogen balances and oxygen balances. These operating variables were used to correlate product gas yield, hydrogen-to-carbon monoxide ratio (H sub 2 -CO), carbon conversion, gas heating value and thermal conversion (a type of thermal efficiency). Another major accomplishment was quantitative analysis of carcinogenic polycylic aromatic hydrocarbons (PAH) in the by-products from the SGFM reactor. The by-products that were analyzed included the impinger tars and the waste water collected following gasification. The conclusions of these analyses are: (1) there are carcinogenic materials in the tar and waste water, even though at low levels, and (2) the presence of the PAH's are signifiantly lower when gasifying with oxygen versus gasification with air. Another objective of this project was to investigate extraction of as-received oak sawdust. The goal of this study was to determine if any valuable compounds could be extracted from the raw feedstock. The extraction tests were notably unsuccessful. Various solvents were used, but the best turned out to be ethanol. Even in the case of ethanol, only 1.2% of the dry, raw biomass was extracted. It was felt that this recovery was too low to justify further work. One objective that was not successfully completed during Phase III of this project was continual operation of the PDU over extended time periods (48 to 168 hrs). 45 refs., 52 figs., 45 tabs. (ERA citation 10:041441)