题 目: Innovative microwave-assisted fast gasification of biomass and solid wastes for biofuels and biochemicals production
报告人：Prof. R. Roger Ruan（Center for Biorefining, University of Minnesota）
时 间：2015年7月23日 15:30
地 点：3003必赢贵宾会官网 B301 阶梯教室
Professor Ruan is the Director of Center for Biorefining and Professor of Bioproducts and Biosystems Engineering Department and Food Science and Nutrition Department at the University of Minnesota. Professor Ruan’s research focuses on various aspects of value-added processing, renewable energy, and food safety and quality. His current interests are in conversion of renewable biomass into energy fuels, chemicals, and materials, biopolymer process improvement, wastewater algae production, food shelf stability and quality enhancement and safety assurance, and nonthermal plasma development and applications in bioprocessing and foods.
Professor Ruan has published over 300 papers in refereed journals, books, and book chapters, and over 300 additional meeting papers and other reports, and holds 15 US patents. He has supervised more than 70 graduate students, 100 post-doctors, research fellows, and other engineers and scientists, and over 10 of his students hold university faculty positions. He has received over 150 projects totaling over $30 million in various funding for research. He served as an editor-in-chief of International Journal of Agricultural and Biological Engineering and editorial board member of Journal of Food Process Engineering, and Associate Editor of Transactions of ASABE, Engineering Applications in Agriculture, and Transactions of CSAE. Professor Ruan has given over 200 invited symposium presentations, keynote addresses, company seminars, and short courses, and has been a consultant for many local, national, and international companies and agencies in renewable energy and products as well as food and value-added processing. Professor Ruan has also given frequent interviews on related topics to various news media.
Professor Ruan received his Ph.D. degree from University of Illinois at Urbana-Champaign in 1991, worked as a Research Associate in Pillsbury Company and Department of Food Science and Nutrition for three years, before joining Bioproducts and Biosystems Engineering Department at University of Minnesota as Assistant Professor in 1994, promoted to Associate Professor with Tenure and appointed to Director of Undergraduate Studies in 1998, and promoted to Full Professor in 2001 and appointed to Director of Center for Biorefining in 2003.
In this presentation, a novel concept of fast microwave-assisted gasification (fMAG) of biomass and solid wastes for syngas production and syngas fermentation for biochemicals synthesis will be presented. A microwave based biomass conversion system has been developed in presence of silicon carbide (SiC) as the microwave absorbent. For fMAG, corn stover was used as the feedstock and three catalysts including Fe, Co and Ni with Al2O3 support were examined and compared for their effects on syngas production and tar removal. Ni/Al2O3 was found to be the most effective catalyst for syngas production and tar removal. The gas yield reached above 80% at the temperature of 900 oC and the composition of tar was the simplest when Ni/Al2O3 was used. The optimal catalyst to biomass ratio was determined to be 1:5–1:3. In addition, fMAG of food wastes were conducted at the temperature of 900 oC and 60-70 wt.% of gas could be obtained for different samples. The contents of H2, CO and CH4 in the gas product were 25-35%, 15-21% and 8.5-10%, respectively for different samples. The H2 to CO ratio in the gas product could reach above 2, which is much higher than that from other solid wastes, and almost perfect mixture for the syngas reforming. Followed by gasification process, syngas was purified and reformed in order to remove impurity gases and obtain high quality H2 and CO. Finally, syngas could be utilized by several bacteria as sources of carbon and energy for biochemicals production. These bacteria include Butyribacterium methylotrophicum for butanol and ethanol synthesis, Clostridial bacteria for ethanol production, photosynthetic bacteria for poly-3-hydroxybutyrate synthesis and Rhodospirillus rubrum for production of hydrogen and polyesters, etc.