Research on reduction of Fe<Subscript>2</Subscript>O<Subscript>3</Subscript> by biomass sawdust

The research on biomass reduction of Fe₂O₃ was carried out by using sawdust as reductant. The direct reducing agents in the biomass magnetization process were determined by comparing various biomass pyrolysis products with the reduction degree (divalent iron content in total iron), reduction temperature range and valence change of Fe₂O₃ in the reduction process. The microstructure variation of Fe₂O₃ at different stages was also analyzed by scanning electron microscopy (SEM). Nonisothermal thermogravimetric analysis (TGA) was applied to explore the thermal reduction process. The results show that the direct reducing substances in the biomass reaction with Fe₂O₃ are H₂ and bio-oil, and the reduction process can be divided into two steps: biomass pyrolyzing to release H₂ and bio-oil, and reductive volatiles reacting with Fe₂O₃. The two steps are relatively independent. The kinetic of the reduction reaction follows a first-order reaction kinetic model, with 88.99 kJ/mol activation energy and 9.55 × 10⁸ min^?1 frequency factor.     

工厂化胶粉改性沥青的开发与应用进展

总结了胶粉改性沥青的发展历程,对比分析了现场拌和法生产的橡胶沥青和工厂化胶粉改性沥青在原材料、加工工艺、混合料设计和高温贮存性方面的优缺点,并进一步介绍了工厂化胶粉/SBS复合改性沥青的生产工艺,展望了工厂化胶粉改性沥青的开发应用前景。     

闸次顺序对三峡船闸过闸效率的影响

三峡船闸为五级连续船闸,相邻闸次运行相互制约,在实际运行中不可避免出现相邻闸次"等闸"现象。为了进一步提高船闸的通行能力,基于大量运行数据,建立了五级上行船舶过闸仿真模型。通过模型仿真分析相邻闸次船舶数量与"等闸"的关系,研究闸次顺序对过闸效率的影响。仿真结果表明:前一闸次船舶数量大于后一闸次时,船舶数量差越小,"等闸"现象时间越短。通过优化闸次顺序,可有效缩短"等闸"现象时长,减小闸次间隔时间,从而提高日运行闸次。     

济南黄河三桥钢桥面铺装技术

分析了环氧沥青混凝土的特点,介绍了济南黄河三桥钢桥面铺装工程环氧沥青混凝土的施工工艺、施工难点及其解决措施。