三聚氰胺燃煤熔盐炉通过鉴定

山东海化魁星化工有限公司研制开发的三聚氰胺可拆卸式活动外罩燃煤熔盐炉最近通过鉴定,并获得国家专利。 该炉是在原三联双程燃煤熔盐炉基础上自行研制开发的国内首创的可拆卸式活动外罩熔盐炉,有效地解决了该公司6000 t/a三聚氰胺装置先天性供热不足的难题,使装置日产量提高了3 t多,并逐渐实现了稳产增产,年增经济效益161万元。该炉以煤为原料,以无机高温载体熔盐为载热介质,对工艺进行加热,广泛应用于化工、冶金等行业,可在300～1000℃范围内的多种工业领域使用,具有升温快、供热量大、运转平稳、高效节能、维修方便等特点。其外罩和每组膜管螺旋面均可迅速拆开、吊出,有效地解决了炉内维修所带来的困难和不便,并且使热效率和容量得到很大提高,为我国三聚氰胺行业熔盐炉的改造开辟了一条新路。     

罗布泊将建成我国第二钾盐基地

全国政协副主席宋健最近在新疆考察时提出，要尽快将罗布泊建成我国第二个钾盐生产基地。 自治区计委、新疆德隆集团有限责任公司三维发展公司、巴州罗布泊矿业有限责任公司、哈密金矿、新疆地矿局和新疆有色局等单位参与了前期开发工作，另外还有八九家国内较大的企业作为股东也参与了前期投资和开发。计划2至3年内见效益，前期生产钾盐20万t/a，3年内建成50万t/a以上的硫酸钾生产能力，最终达到100万t/a目标；总投资10多亿元；与钾盐相关的产业及其它资源，如盐湖农业、罗布泊旅游业也将随之启动。 负责罗布泊总体开发的新疆罗布泊钾盐科技开发公司有关负责人坦言，罗布泊的开发难度较大，最主要是环境恶劣，路、水、电等基础设施建设投入很大。     

Global Blueprint of Energetic CNPC

China National Petroleum Corporation （CNPC） is taking on the world with great success. The nation＇s top oil producer began energy-exploration projects for the first time in a number of countries last year, such as Equatorial Guinea, Uzbekistan and Argentina. This brings the total number of overseas countries where CNPC has a total of 66 projects in operation to 26, forming five major operational regions including Africa, Central Asia, South America, the Middle East and Asia Pacific. With the overseas oil and gas business brought under rapid development, the newly additional recoverable reserves of the company worldwide reached 65.40 million tons.     

感潮河段洪水预报的不恒定流计算方法研究

一感潮河段的水流过程是外海潮汐和上游迳流共同作用下的运动过程,其流速、水位和过水断面等因素随时间而变化,属于不恒定流过程。因此,潮汐河口的洪水预报较之无潮河流更为复杂。     

麦达佩克铜选矿厂通过改进浮选过程提高铜回收的技术指标

该厂原选别流程南斯拉夫麦达佩克铜选矿厂分两期建成,目前每年可处理1100万吨贫铜矿石。第一期工程(一号浮选车间)于1961年投产,年处理能力为360万吨矿石。第二期工程又建了两个浮选车间(即二号和三号浮选车间),它们分     

超高性能纤维混凝土梁抗剪性能试验研究

进行9根超高性能纤维混凝土梁抗剪性能试验,试验梁变化参数包括:剪跨比、配箍率、预应力水平。试验结果表明:剪切破坏形态随剪跨比由小变大依次表现为斜压、剪压和斜拉破坏三种形式,抗剪承载力随剪跨比的增大而减小;用HRB500级钢筋做箍筋,箍筋的强度能够得到充分发挥,抗剪承载力随配箍率的增大而提高;预加力可以显著提高梁的抗剪承载力;正常使用极限状态下剪切斜裂缝最大宽度不超过0.2mm;临界斜裂缝形成前斜裂缝宽度发展缓慢,形成后发展速度明显加快;采用现有规范计算超高性能混凝土梁的抗剪承载力会导致过于保守;考虑剪跨比、配箍率、预加力因素建立超高性能混凝土梁的抗剪承载力统计计算的经验公式,按照经验公式对试验及所搜集的17根梁进行计算,计算值与试验值吻合较好,且变异系数较小。     

An Exact Solution for Heat Transfer of a Jet Co-Axially Impinging on a Rotating Disk and Its Comparisons with Stagnation Point Experiments

IntroductionJet impingement is a widely used high-efficiencytechnique fOr cooling rotating disks, which are end-wallsurfaces of gas turbine rotors, comPuter disk drives etc.Fluid f'low, heat trallsfer and geometric arrangement inthe case of a single round jet impinging co-axially in anorthogonal mode on a rotatng disk are characterized byFig. l.Many peculiarihes of fluid fIow and heat transfer ofreal impinging jets under comPlicated conditions(different system geometry, impinging flow proper…     

Assessment of medical occupational radiation doses in Costa Rica

Participation of the University of Costa Rica (UCR) in activities in an IAEA Regional Project RLA/9/066 through training, equipment and expert missions, has enabled to setting up of a national personal monitoring laboratory. Since 2007, the UCR has been in charge of monitoring around 1800 medical radiation workers of the Social Security System. Individual external doses are measured with thermoluminescent dosemeter using a Harshaw 6600 Plus reader. The service has accreditation with ISO/IEC 17025:2005. Distribution of monitored medical personnel is as follows: 83 % in diagnostic radiology, 6 % in nuclear medicine and 6 % in radiotherapy. Preliminary values for the 75 percentile of annual H(p)(10) in mSv are: radiology 0.37; interventional radiology 0.41; radiotherapy 0.53 and nuclear medicine 1.55. The service provided by the UCR in a steady and reliable way can help to implement actions to limit the doses received by the medical workers and optimise their radiation protection programs.     

Photosensitized degradation in water of the phenolic pesticides bromoxynil and dichlorophen in the presence of riboflavin, as a model of their natural photodecomposition in the environment

Within the context of environmentally friendly methods for the elimination of surface-water pollutants, the photodegradation of the phenolic pesticides bromoxynil (BXN) and dichlorophen (DCP) under simulated natural conditions has been studied. The work was done in the presence of the visible-light absorber photosensitizer riboflavin (Rf), usually present in trace quantities in natural waters. Under aerobic conditions, an efficient photooxidation of both pesticides was observed. The relatively intricate photochemical mechanism involves pesticide and oxygen consumption and, to a lesser extent, Rf degradation. The kinetic and mechanistic study supports that both H(2)O(2) and singlet molecular oxygen, O(2)((1)Δ(g)), are involved in the process. Kinetic data for the O(2)((1)Δ(g))-mediated oxidation indicate that BXN and DCP are photodegraded with this species faster than the parent compound phenol, very frequently employed as a model for aquatic contaminants, likely due to their lower pK(a) values. This observation allows the design of phenolic pesticides with different photodegradation rates under environmental conditions.