加装采风口增强通风管路堤的降温效果

针对青藏高原多年冻土区通风管路堤,研究了加装采风口对通风管路堤降温效果的增强作用.基于路堤通风管的进风量,具体分析了加装采风口增强通风管路堤降温效果的影响因素.分析表明,加装采风口后通风管路堤的冬季降温效果显著增强;当采风口安装在竖向通风管顶端时,通风管路堤冬季降温效果随着竖向通风管高度的增加而增加.对流换热是通风管路...     

活性炭变压吸附回收环氧乙烷装置排放气中的乙烯

以活性炭为吸附剂，对工业环氧乙烷装置排放气中乙烯的回收进行了研究。测定了环氧乙烷装置排放气中主要组分的吸附等温线及脱附性能，发现活性炭对乙烯的吸附量较高，与氧气、氮气和氩气等组分的分离度较大。在此基础上，研究了活性炭的变压吸附性能，在常规真空脱附工艺条件下，乙烯的回收率较低，但通过提高脱附真空度或进行甲烷反向吹扫，可以大大提高乙烯回收率和惰性气体的脱附率。     

合成氨尾气综合利用新途径

介绍了利用合成氨生产中的弛放气和放空气经压缩、洗氨、脱水、液化等生产过程获得液化天然气产品的回收工艺。通过实例验证,该工艺不仅可提高资源的利用效率,而且投资小、收益高、投资回报期短,也符合国家节能减排的政策方向。     

(210)Po and (210)Pb in the tissues of the deep-sea hydrothermal vent mussel Bathymodiolus azoricus from the Menez Gwen field (Mid-Atlantic Ridge)

The hydrothermal deep-sea vent fauna is naturally exposed to a highly specific environment enriched in potentially toxic species such as sulfides, metals and natural radionuclides due to the convective seawater circulation inside the oceanic crust and its interaction with basaltic or ultramafic host rocks. However, data on radionuclides in biota from such environment are very limited. An investigation was carried out on tissue partitioning of ²¹⁰Po and ²¹⁰Pb, two natural radionuclides within the ²³⁸U decay chain, in Bathymodiolus azoricus specimens from the Mid-Atlantic Ridge (Menez Gwen field). These two elements showed different distributions with high ²¹⁰Pb levels in gills and high ²¹⁰Po levels in both gills and especially in the remaining parts of the body tissue (including the digestive gland). Various factors that may explain such partitioning are discussed. However, ²¹⁰Po levels encountered in B. azoricus were not exceptionally high, leading to weighted internal dose rate in the range 3 to 4 μGy h^− 1. These levels are slightly higher than levels characterizing coastal mussels (~ 1 μGy h^− 1).     

泥岩盖层封闭游离相天然气有效性及其研究方法

本文在深入研究泥岩盖层封闭游离相天然机理及其能力演化基础上，通过泥岩盖层毛细管，封闭能力形成时时期与气源岩大量排气勘的匹配关系。     

喷射泵在高炉布袋除尘输灰工艺上的应用

高炉布袋除尘系统输送布袋灰时扬尘严重，直接威胁着岗位操作工人的身体健康，同时对附近环境也造成了严重污染。采用ＱＰＢ喷射泵输送灰后，减少了灰尘对环境的污染，减轻了工人的劳动强度，并能把灰密封输送到４０ｍ高空和距离２０００ｍ远的地方，它具有污染少、投资省、效益高等特点。     

PQ45A型排气洗井装置的研制及应用

针对海上油田的安全控制要求和电泵井采油管柱,设计了一种电泵井排气洗井装置。PQ45A型排气装置采用地面液压控制结构,把它与井口控制盘相连,可以从地面遥控井下排气洗井装置,从而可以定期排放油套环空的气体,有利于保证电泵的最佳沉没度,此外还可以保证油井的无套压生产,它的开启压差为14 MPa,关闭压差为7 MPa,目前已经在胜利浅海油田进行了27井次的现场试验,应用证明该装置液压系统压力稳定,密封系统严密可靠。     

建筑给排水设计中的若干问题探讨

针对给排水工程设计中的消防给水箱设置位置不当、生活给水系统节能、排水通气管设置不合理等问题进行了探讨,并给出了科学合理的解决方案,可供相关人员参考.     

三峡大坝泄洪建筑物水力学监测

本文主要介绍了三峡大坝泄洪建筑物在135m库水位时水力学观测成果.监测成果的完整性和系统性较好,为工程的验收、制定枢纽运行管理规程提供了科学依据。同时,对今后国内外高水头水利工程的设计和运行具有十分重要的参考价值。     

A comparison study into low leak rate buoyant gas dispersion in a small fuel cell enclosure using plain and louvre vent passive ventilation schemes

Hydrogen, producing electricity in fuel cells, is a versatile energy source, but with risks associated with flammability. Fuel cells use enclosures for protection which need ventilating to remove hydrogen emitted during normal operation or from supply system leaks. Passive ventilation, using buoyancy driven flow is preferred to mechanical systems. Performance depends upon vent design, size, shape, position and number. Vents are usually plain rectangular openings, but environmentally situated enclosures use louvres for protection. The effect of louvres on passive ventilation is not clear and has therefore been examined in this paper. Comparison ‘same opening area’ louvre and plain vent tests were undertaken using a 0.144 m³ enclosure with opposing upper and lower vents and helium leaking from a 4 mm nozzle on the base at rates from 1 to 10 lpm, simulating a hydrogen leak. Louvres increased stratified level helium concentrations by typically in excess of 15%. The empirical data obtained was also used in a validation exercise with a SolidWorks: Flow Simulation CFD model, which provided a good qualitative representation of flow behaviour and close empirical data correlations.