天津轧三2×1260 m~3高炉喷煤系统设计特点及运行实践

介绍了天津轧三钢铁有限公司2×1 260 m~3高炉喷煤系统的设计特点,讨论了煤粉计量、喷吹罐压力控制等问题。该喷煤系统采用三罐并列、喷吹主管加分配器的直接喷吹形式,系统喷吹能力大,单座高炉最大可达29 t/h;三罐并列形式实现了充压氮气的回收,延长了设备使用寿命。一年多的生产实践表明,该设计合理,布局紧凑,系统运行平稳,吨铁喷煤比控制在150 kg,有效地降低了生产成本。     

Hanford罐贮高放废物回取及废物最小化经验

介绍了美国Hanford场址罐贮高放废物的回取,包括废物回取标准,回取技术——改进型冲洗法、盐饼溶解法、真空回取法和移动回取法等,以及在实施罐贮废物的回取中的废物最小化方面的经验等。     

从浮选尾矿中回收含金黄铁矿实践

对河南金源金矿浮选尾矿采用螺旋溜槽粗选、摇床精选重选工艺进行二次回收,得到含金硫精矿,取得了较好的经济效益,每年可为企业获得约1 660万元利润。     

Modeling the pathways and attenuation of nutrients from domestic wastewater treatment systems at a catchment scale

Domestic Wastewater Treatment Systems (DWTS) are often cited as significant sources of pollution in rural catchments. A mass balance based model has been developed to determine annual nutrient loading from individual DWTS into rivers in Ireland. The transport and attenuation of nitrogen and phosphorus in DWTS effluent to groundwater and surface water has been formulated using the results from field research in Ireland, as well as being informed by other international studies. Conceptually the model splits the transport of nutrients to the river into three pathways: direct to surface water (for areas of inadequate percolation), a near surface (subsoil) pathway, and a groundwater pathway. The model quantifies the net nutrient contribution for each DWTS and has been incorporated into a broader source load apportionment catchment model which includes agricultural inputs, thereby enabling the relative risk of nutrient pollution from DWTS in a catchment to be defined.     

镀锌机组清洗槽刷辊枢轴劣化倾向分析与对策

针对镀锌清洗槽工艺特点,结合生产实际,重点分析了刷辊枢轴装置产生劣化倾向的原因,提出了相应措施并加以实施,提升了清洗槽设备整体工作性能,对提高产品质量产生积极影响。     

浅议油罐消防泡沫管线的腐蚀问题

针对油罐消防泡沫管线的腐蚀问题,通过对管线施工及使用过程中各种影响因素的分析,得出管线产生腐蚀的几种可能原因,进而采取相应的措施。     

LNG储罐区防液堤的设计探讨

结合工程实例,探讨了LNG储罐区防液堤设计中有效容积和形状的确定、混凝土材料的选择和配置.针对提高防液堤的抗低温和耐高温性能,提出了建议.     

基于仿真设计的坦克炮发射动力学研究

本文首先分析了坦克炮发射全过程动力学仿真技术，并通过运用计算机仿真技术，构建了坦克炮发生全过程的各种模型，以此为坦克炮设计人员运用计算机对坦克炮的核心心梗进行分析，就设计方案予以修改与确定，以及我国后续装甲装备的评估、论证与研制，提供了全面、科学且多元的技术途径与科学方法。     

Controlled oxidation-reduction potential on dark fermentative hydrogen production from glycerol: Impacts on metabolic pathways and microbial diversity of an acidogenic sludge

The oxidation-reduction potential (ORP) is an important factor in H₂ production via dark fermentation however its effect over microbial diversity in an acidogenic sludge has not, been well studied. This work studies the effect of ORP controlled by hydrogen peroxide and potassium ferricyanide on continuous hydrogen production and microbial diversity in an acidogenic sludge fed (HRT 12 h and pH 5.5) with glycerol. Results show that the more oxidizing ORP control environment (?540 mV) improves H₂ yield by 50–70% (0.31–0.51 molH₂/mol glycerol) over non-ORP control conditions. Oxidizing ORP values were shown to enrich microorganisms of the genus Clostridium, which have been linked to high H₂ yields. Therefore, controlling ORP in an acidogenic sludge was shown to directly modify microbial diversity at the genus level, and could likely to indirectly regulate metabolic function. Additionally, metabolic pathways were regulated by the kind of agent used.     

Long Term Change in Level-Volume Relation of an Accountability Tank for Plutonium Nitrate Solution

A slight change in the level-volume relation for an accountability tank for a large amount of plutonium nitrate solution (PuN) was observed at the Plutonium Conversion Development Facility (PCDF) in the Power Reactor and Nuclear Fuel Development Corp. (PNC), Tokai Works. From the results of annual tank re-calibrations for the plutonium receiving tank from 1985 to 1992 using the incremental feed of nitric acid as the density standard, it became clear that the relation between the level and the volume changed slightly, and the rate of the change was a linear function of operating time. Also it became clear that the change was linear in relation to the level. In the PCDF, the cumulative change in the volume at the nominal level was evaluated to be 0.1% during 8 years' operation. It was also evaluated that the repeatability of the re-calibration is much better than 0.1%. A reasonable frequency of tank re-calibration is once every 5 years.