分层环境中水库密度流运动特性研究

该文采用水槽试验对稳定温度分层水库的密度流运动进行了模拟.通过不同的试验方案,模拟了不同温度分层条件下密度流运动形态,分析了水体分层强度和出口条件对密度流运动的影响,并在此基础上,对不同水库运行方式下密度流运动特征进行了模拟研究.该文研究结果为水库水质、水生环境管理与调度以及水库应急预警方案的制定提供了参考.     

基于风险的检验（RBI）在乙烯企业的应用

对某乙烯企业中的环氧乙烷/乙二醇（EOEG）装置和低密度聚乙烯（LDPE）装置进行基于风险的检验（RBI）分析.根据风险评估结果,识别出装置设备和管道的损伤模式、机理和检验周期,制定了检验策略,为装置的定期检验提供参考.     

MBR工艺技术在工业废水处理的应用

文章重点阐述了MBR工艺类型、工艺优势、影响因素、运行管理、在工业废水处理中的应用,并对今后的研究方向进行了展望。     

滤板施工技术比较

滤板是水处理滤池工艺的重要组成单元，文章对预制滤板和整体现场浇筑滤板的施工技术进行了比较说明，并得出了滤板施工技术选型结论。     

Conversion of recycled sawdust into high HHV and low NOx emission bio-char pellets using lignin and calcium hydroxide blended binders

Spruce wood sawdust (S), as biomass waste, could be utilized as a renewable fuel, but it suffers from its bulky, low energy density, high volatiles content and NO_x emission. This study investigated the possibility of conversion S into bio-char pellets (SC-Ps) as renewable and CO₂-neutral bio-fuel. Sawdust derived bio-char (SC) was produced through pyrolysis, and subsequently compressed into SC-Ps bonded by lignin (L) and hardened by Ca(OH)₂, NaOH, CaCl₂, CaO. The combustion characteristics of S and SC, the physical properties of SC-Ps including abrasive resistances (ARs), impact resistance index (IRI) and compress strengthens (CS) were evaluated. Results showed that the high heat value (HHV) of SC increased by 95% and its NO_x emission decreased due to the release of N-containing volatiles. Among these hardeners, addition of 5% Ca(OH)₂–10% L reduced the disruptive force created by uptake moisture and played an effect of hydration on hardening the bonds. In addition, the catalysis of hydroxide promoted the polymer chain growing into three-dimensional cross-linking that strengthened the bonds. Thus, the mechanical strengths of the SC-Ps bonded by Ca(OH)₂/L were sufficient for directly transportation and being charged into the blast furnace.     

Reduction of excessive energy in the four-noded membrane quadrilateral element. Part I: Linear theory-compressible materials

The objective of the paper is to set forth, in a consistent manner, reasons for the appearance of excessive energy in the four-noded membrane quadrilateral element and to propose a formulation leading to simple and reliable elements that are less sensitive to distortions of the geometrical shape. By presenting the differential geometry, emphasis is placed upon those geometrical attributes which are inherently related to the quadrilateral. A modified version of the functional of Hu-Washizu is employed for the discretization. Appropriate approximations for the displacements/rotations are chosen and the physical meaning of the various parameters is identified. A systematic procedure is followed for the approximation of stress and strain. The convergence of the formulation is investigated by examining the inf–sup condition and applying the patch test. Also, results of numerical examples and comparisons with other elemental formulations are presented.     

分子筛吸附在氢气提纯中的应用

L3.3-3/150型氢气压缩机出口氢气的露点不能满足GBT7445—1995纯氢标准的要求,无法达到高端市场的要求,因此,利用分子筛吸附进行提纯技术改进。分子筛对水分子有较强的亲和力,它吸附氢气中的水分,使氢气露点温度td≤-52.1℃。改造后,出口氢气湿度达到了标准的要求。     

适用于污染河水修复的可渗透反应墙材料筛选

通过中试规模的模拟试验,进行了适用于污染河水修复的可渗透反应墙(PRB)反应材料筛选研究.结果表 明,以铁屑、焦炭、沸石和石灰石为反应材料的不同配比的6个反应器(A～F)对COD、TN及TP均有一定得去除效果,其中,反应器E对COD、TN及TP的平均去除率分别是61.0%、85.8%和82.O%,显著高于其它材料配比的反应器;各反应器出水铁离子含量均高于进水,但远远低于抑制微生物降解作用的最高容许含量.综合各项指标,反应器E和F反应材料铁屑,焦炭、沸石的体积比较佳,分别为1:2:1和1:1:2,适于典型地表污水.污染河水的修复,其中又以反应器E的反应材料配比更优.     

添加剂强化粉煤燃烧固硫剂的研究

文章选取CaCO3、Ca(OH)2质量配比=3∶2作为主固硫剂,用2%钙基(质量配比)的Na2CO3对其改性,利用蛭石作为固硫添加剂。在Ca/S=2.25的情况下通过固硫实验考察了主固硫剂以及添加剂的加入对固硫率的影响。实验表明:煤粉掺入该固硫剂在950℃下燃烧半小时,固硫率可以达到85%,该固硫剂主要由天然矿物所组成,具有来源广、成本低廉等优势,因而具有极高的应用价值和市场推广潜力。