金堆城钼细泥过滤脱水应用研究

对在“57钼精矿”生产过程中产生的用常规过滤无法进行脱水的钼细泥，用TT系列陶瓷过滤机进行脱水研究。完全解决了钼细泥的脱水问题。保证了“57钼精矿”生产工艺的畅通。     

Initial moisture effects on herbal biomass torrefaction behavior: Gaseous products evolution and char structure analysis

Initial moisture effects on biomass torrefaction were investigated by thermogravimetric (TG) and Fourier transform infrared spectrometer (FTIR) methods. Mass degradation properties, gaseous products’ evolution characteristics, and biomass char chemical structural features were studied. Results show that during torrefaction process, the evaporation of water will create a porous structure inside the solid particles, hence extend the mass loss time intervals. Gaseous products’ evolutions were favored, while tar was reduced because of enhanced secondary decomposition. Char structure analysis suggested that –OH stretch was slightly strengthened through water molecule decomposition and other radical reactions, which would increase the reactivity of char gasification and combustion.     

Simulation of temperature and reaction time prediction of the torrefaction process: case of hard-wood biomass

Direct utilisation of biomass for energy application is less profound due to the problems of low calorific value, high water content, and low grindability of biomass. For this reason, pre-heating treatment, sometimes called torrefaction, is necessary to improve the physical properties of biomass similar to ‘coal-like’ material. Unfortunately, only few comprehensive but simple theoretical models focused on hard-wood biomass were available to describe the torrefaction process. In this discussion, a simple proposed torrefaction model was developed and reported. The model has ability to estimate the yield of product mass and energy after the torrefaction process and determine the optimum conditions.     

低温烘焙下城市生活垃圾与烟煤的混燃特性

为了探讨垃圾与煤的混燃特性,选取城市生活垃圾(MSW)和烟煤(BC)为研究对象,通过热重分析法研究烘焙温度、掺混比例、升温速率对样品燃烧特性的影响,并采用Kissinger-Akahira-Sunose(KAS)法计算样品的活化能.结果表明:MSW经220℃,260℃和300℃低温烘焙后,热值都有所提升,随着烘焙温度上...     

磷酸二氢铵对玉米秆烘焙及固定床燃烧颗粒物排放特性的影响

使用立式管式炉反应器并结合低压撞击器颗粒物采集装置研究了玉米秆掺混磷酸二氢铵（NH₄H₂PO₄）烘焙对烘焙产物理化性质及固定床中燃烧颗粒物排放的影响。结果表明,玉米秆单独烘焙可有效提升生物质品质,但也提升了颗粒物排放。300℃烘焙时,PM₁、PM_1-2.5和PM_2.5-10分别增排76.5%、194.8%和170.2%。在烘焙过程掺混NH₄H₂PO₄可进一步提质,使得固体产物灰分有不同程度的增加,显著降低固体产物的O/C比,并提高样品的无灰基热值。此外,研究发现掺混NH₄H₂PO₄可显著提高烘焙过程Cl的释放率并降低固体产物中Cl的含量,有利于降低后续燃烧PM₁的排放。在掺混比例P/K摩尔比为1时减排效果最佳,此时PM₁相比无掺混时减排28.8%。结果表明在生物质烘焙过程引入NH₄H₂PO₄可以促进Cl的脱除并减少后续燃烧过程细颗粒物的排放,是一种有前景的生物质预处理手段。     

双氧水氧化尾气回收装置运行总结

简述了采用活性炭纤维吸附解吸工艺对双氧水氧化尾气回收的工艺流程及运行情况。     

Investigating effects of temperature on fuel properties of torrefied biomass for bio-energy systems

Torrefaction of selected agro-residues (rice straw and cotton stalk) was successfully carried out on indirectly heated, batch-type fixed-bed reactor under different reactor temperatures (200–300°C) at a fixed heating rate of 10°C/min. Our preliminary results demonstrated that the rice straw, torrefied at 275°C, exhibited higher mass yield (64%) and energy yield (84%) with better fuel properties, i.e. lower moisture content (1.2%), volatile matters (54.7%), higher fixed carbon (24.8%), and higher heating value (HHV) 18.7 MJ/kg. On the other hand, cotton stalk showed a slightly lower mass yield (56.3%) and energy yield (74.4%) compared to rice star with very high HHV 22.5 MJ/kg torrefied at a relatively lower temperature of 250°C. Interestingly, the lignocellulosic composition showed a drastic increase in the lignin content of rice straw and cotton stalk, torrefied at 275°C and 250°C, respectively, which indicates good binding ability of bio-fuel leading to improved energy density. Our present work gives an insight that the torrefied rice straw and cotton stalk could be a promising biomass feedstock for bio-energy based systems such as biomass pyrolsyis and gasification.     

烘焙温度和停留时间对生物炭特性的影响

以杨树枝、柳树枝、稻壳、玉米秸秆、成型稻壳和成型木屑6种生物质为对象,在烘焙温度为200~300℃和停留时间为20~40 min的条件下,利用固定床烘焙实验装置开展了生物质烘焙实验,结合生物炭的工业分析、元素分析和热值测定结果,分析了烘焙温度和停留时间对生物炭H/C,O/C,能量得率,能量密度的影响。结果表明:随着烘焙温度和停留时间的增加,生物炭的挥发分,质量得率,H/C,O/C,能量得率不断下降,固定碳、低位发热量和能量密度不断升高;烘焙温度对生物炭的影响显著强于停留时间,烘焙处理对木质类和农业类生物质影响显著强于成型生物质;在烘焙温度为300℃和停留时间为40 min的条件下,成型生物质的能量密度最高仅为1.10,而木质类生物质的能量密度最高可达到1.40。