膨胀机在天然气液化工程的应用

介绍膨胀机的原理及在天然气液化工程中的应用情况。结合实例,探讨采用透平膨胀机的天然气液化工艺流程和气体轴承的应用。     

凝析气田外输气烃露点控制方法研究

凝析气田普遍为高压气田,处理厂采用传统的节流阀制冷控制外输气烃露点工艺,在气田开发后期出现不适应性现象。为了进一步提高处理工艺对气田开发的适应性,提出了用透平膨胀机代替节流阀制冷以控制烃露点的工艺。通过对节流阀制冷脱烃工艺和透平膨胀机制冷脱烃工艺的对比分析认为,透平膨胀机低温脱烃工艺不仅能降低集输压力,延迟工艺调整的时间,而且降低了工程建设投资及能耗,具有较强的适应性,可为其他凝析气田处理工艺设计提供新的思路。     

天然气输配过程中余能回收的探讨

节能是我国进行社会主义建设和实现社会可持续发展的长期基本国策,是企业降低生产成本重要途径.本文通过天然气输配系统的工艺分析,对输配过程中能源流失项目"调压过程的压能损失"的回收及应用方向进行了研究论证,简述了压能回收设备"透平膨胀机"的工作原理.依据北京市天然气用量统计资料,进行了以透平膨胀机带动发电机的出力计算.粗略估算了北京地区压能回收的发电潜力和通过压能回收降低燃气企业运行成本的经济效益,用国家电力缺口统计数据证明了余能发电对缓解国家电力紧张局面的现实意义.     

天然气加工过程中的■分析

对天然气加i中NGL回收装置进行了炯分析,热分离机和透平膨胀机法的等嫡效率略有差别外,两者主要差别在于功(透平膨胀机)和热(热分离机)的回收方面。由于实际状况偏离设计条件,导致热分离机装置烟效率远低于遗乎膨胀法,还分析了天然气中酸性气体(Cq、凤S)吸收再生浓缩过程和后续的克劳斯法硫回收装置的烟平衡。图1、表5。天然气加工过程中的■分析@项友谦~~     

涡流管的原理及在天然气领域的应用

分析了涡流管的原理和特性,介绍了涡流管在国内外天然气领域中的应用。     

天然气高压管网余压发电项目可行性分析

城市天然气高压管网蕴含了巨大的压力能。该文通过对天然气输配系统的工艺分析,探讨了输配过程中压力能损失的回收方式及应用方向。提出了利用高压调压站的压力差通过透平膨胀机(TRT)发电的天然气高压管网余压发电方案。粗略估算了发电潜力及通过发电创造的经济效益和社会效益。     

天然气管网压力能利用工艺的火用分析

论述了天然气管网压力能的计算方法,利用天然气压力能进行储气调峰、发电、天然气液化、膨胀制冷的工艺流程。采用透平膨胀机回收利用天然气管道的压力能时,压力转换为机械功和冷火用,机械功大于冷火用,充分利用转换的机械功和冷火用有利于提高天然气管道压力能的利用效率。     

天然气膨胀机降压工艺冷能冷却燃气轮机进气

提出利用天然气经透平膨胀机降压产生的冷能降低燃气轮机进气(空气)温度。结合工程实例,介绍燃气轮机进气冷却系统流程,计算进气冷却系统的冷负荷与调压工艺的制冷能力。采取进气冷却后,燃气轮机实际输出功率平均提高8.3%。     

天然气研究院涡流管技术获得3项专利授权

<正>经过10年的努力,目前,中国石油西南油气田公司天然气研究院在涡流管气液分离技术研究工作中,通过对亚音速涡流管和超音速涡流管的5轮研究,3项成果获得授权专利证书。这3项授权专利分别为:发明专利"一种超音速涡流管气体脱水脱烃的方法"(专利号:ZL201110071111.8)和"一种预成核超音速涡流管天然气脱水方法"(专利号:201010115527.0);实用新型专利"一种预旋流超音速旋流分离器"(专利号:ZL201120069282.2)。"一种超音速涡流管气体脱水脱烃的方法"设计了1种多级脱水、脱烃的流程,在能耗利用方面达到     

涡流检测在核电站中的应用

在我国核电站的高速发展阶段,核电设备可靠安全不容忽视,如何保证核设备的安全则成为重中之重。核电站在服役期间,定期对相关部件进行在役检查,涡流检测作为无损检测方法之一,发挥着其不可替代的作用。本文从涡流检测在蒸汽发生器传热管、反应堆螺栓/螺母、冷凝器钛管等方面,描述了涡流检测在核电厂中的应用。     

天然气管网压力能利用研究进展

高压管网输送的天然气在调压过程中释放巨大的压力能,通过降压设备将这部分能量有效回收,用于发电、天然气脱水、轻烃分离、LNGS~NGH调峰、橡胶粉碎和冷库等领域。,具体描述了联合循环发电和回收压力能所制得的冷能在冷库中的运用;,针对天然气供气不平衡、调压站分布不集中以及能量高效利用的问题,提出了改进方案,充分利用膨胀机输出的功驱动压缩机等设备的运转,将膨胀制得的冷量运用在相应的冷产业中,保证了压力能的高效利用。     

Stationary vortices attached to flat roofs

This paper treats the topic of a conical vortex attached to a plane horizontal surface. Data have been collected from measurements on freely suspended cubes in a wind-tunnel. Data are analyzed and some vortex properties derived. The pressure coefficient is found to decrease as the inverse of the square root of the distance from the corner. Experimental results are used to construct an analytical model of the conical flow derived from a solution to the non-linear vorticity transport equation and the resulting flow is predicted. This flow is used to calculate the pressure suction on the attached surface. An application would be pressure on flat roofs of high-rise buildings subjected to an adverse wind.     

About the penetration of a horizontal axis cylindrical vortex into the nearby downwind region of a vertical porous fence

Wind tunnel experiments have been conducted on a cylindrical vortex embedded in a low turbulence stationary horizontal stream, running through a two-dimensional narrow vertical woven fence located on the wind tunnel floor.The vortex was continuously generated upwind of the fence by means of a vortex tube located well below the fence top level, with its axis aligned with the mean velocity of the external stream. The fence installed along the entire width of the tunnel had a porosity of 70%. Visualization experiments showed that approaching the fence the vortex moves away from the mean wind direction of the adjacent stream along a rising curved trajectory while the direction of the surrounding mean flow remained nearly horizontal. The results suggest that this deviation could be promoted by the vortex slanting velocity field relative to the fence, which “sees” a fence with much lower optical porosity than the fence perpendicular velocity of the nearby mean flow.The fence top shear layer flow, which dominates the downwind evolution of the mixing layer, appears to be highly sensitive to the presence of this type of vortex. The most energetic changes in the flow due to the presence of the vortex occurred in the mixing layer region. Windbreaks are usually designed in terms of mean velocity, turbulence intensity, geometric dimensions, and porosity. The results presented in this paper suggest that the sheltering ability of a porous fence depend also on the particular flow pattern of the oncoming turbulent structures embedded in the incident wind. The results show the importance for a particular wind sheltering application in knowing a priori at least some aspects of the flow pattern of the most representative turbulent structures of the local wind.     

Performance analysis of a transcritical N2O refrigeration cycle with vortex tube

In the present study, vortex tube is used in transcritical vapour compression cycle as expansion device to improve the coefficient of performance (COP). The thermodynamic analysis has been performed using nitrous oxide in transcritical cycle with vortex tube (TCVT) and its results are compared with those of a transcritical cycle with expansion valve (TCEV). The evaporator and the gas cooler temperatures have been varied between ?55°C and 5°C and between 35°C and 60°C, respectively, for the analysis. The COP of the TCVT improves by 1.72–27.01% compared to TCEV. A decrease in evaporator temperature and an increase in gas cooler exit temperature result in a decrease in COP. The increase in cold mass fraction brings a negligible increase in maximum COP. The performance comparison of N₂O and CO₂ in TCVT shows that maximum cooling COP for N₂O is higher than for CO₂, but the optimum pressure required for N₂O is lower than for CO₂.     

基于表面风压分析的分离式双箱梁流场特性研究

为研究分离式双箱梁流场特性,以某分离式双箱梁断面斜拉桥为研究对象,采用节段模型测振与测压试验的方法得到分离式双箱梁不同状态下的表面风压,通过对风压进行分析处理得到不同状态下风压脉动主频分布及平均风压系数分布.在振动状态下,对扭转涡振锁定区间内及超出扭转涡振锁定区间后分离式双箱梁模型表面风的压力脉动主频分布区域的变化进行...     

PHC管桩的施工及发展

根据多年的施工经验,结合工程施工过程中的具体情况,简单阐述了PHC管桩的优缺点以及静压法沉桩施工措施,并对PHC管桩以后在诸多形式桩基中的发展趋势进行了展望,以推广它的应用。     

火旋风燃烧过程中负压场的探究

为了探究自然驱动的四面夹缝火旋风装置中,火旋风燃烧过程中油层表面形成的负压场,在一定简化的假设条件下,建立了火旋风燃烧过程中产生的负压场模型,对火旋风的涡核半径、涡核强度进行了计算.实验室形成的小型火旋风涡核半径与油盘尺寸成正相关.涡核强度与涡核半径的关系则可用指数函数表示;气动力机制是决定火旋风质量燃烧速率的主导机制...     

深井软岩巷道钢管混凝土支护结构性能试验及应用

 深井软岩及动压巷道支护难度大,传统的支护方式已难以满足需要。为此研发钢管混凝土支架,在实验室测试支架的力学性能,试验支架采用f140 mm×4.5 mm钢管和C40混凝土,由4段构成,接头采用套管连接。在侧向约束、纵向点载荷加压条件下,试验支架的极限承载力为1 504.1 kN,纵向极限压缩变形为82.65 mm,破坏方式为钢管材料屈服破坏。与U型钢支架相比,钢管混凝土支架支护反力大、性价比优越。钢管混凝土支架在煤矿井下巷道支护应用效果良好,有着广泛的推广应用前景。