共查询到19条相似文献,搜索用时 78 毫秒
1.
本文结合差压式流量计和涡街流量计的原理,对节流装置、巴类流量元件和涡街流量计测量蒸汽流量的主要影响因素进行分析,并根据几种不同仪表的特点,分别就选型、安装、经济效益等方面进行分析,并总结几种测量仪表的优点与不足。 相似文献
2.
针对现代炼厂较少维护和低能耗的需求,涡街流量计在流量测量中应用的越来越广泛。本文比较了涡街流量计在国内外炼厂的应用现状,分析了涡街流量计在流量测量的优势,同时探讨了影响涡街流量计测量准确性的因素和对策。 相似文献
3.
涡街流量计可用于部分混相流的测量,但迄今为止有关混相流对涡街流量计测量特性的影响还缺少理论研究和实践经验.在体积含气率为2.0%~15.0%的范围内,评定了用涡街流量计测量气液混相流的不确定度,提出涡街流量计测量气液混相流的不确定度计算式.实验以空气和水为介质产生气液混相流,涡街信号通过管壁差压法采集,涡街频率通过功率谱分析获得.结果表明在保持涡街流量计一定测量准确度的前提下,涡街流量计相对扩展不确定度随气液混相流流量及其体积含气率的分布比较均匀;在涡街频率测量的不确定度分量中,由重复性和复现性引起的相对标准不确定度随流量的变化呈现出较强的随机性,而由频率分辨率引起的相对标准不确定度则随着流量的增加而减小.在本研究的流量与体积含气率范围内,由气液混相流引起的涡街流量计附加相对不确定度小于2.0%.这一研究为分析气液混相流对涡街流量计测量特性的影响提供了有益的借鉴. 相似文献
4.
介绍了400 kt/a硫磺制酸装置中液体硫磺流量计的应用情况.在实际应用中,质量流量计、转子流量计、靶式流量计均不同程度地存在问题.经过分析比较选用了涡街流量计.3年的应用表明,涡街流量计能很好地测量液体硫磺的流量,实现长周期、稳定、可靠、免维护、准确运行,而且性价比较高. 相似文献
5.
涡街流量计是生产中测量流量的重要工具之一。文章简述了涡街流量计构测量原理、基本结构,洋细分析了影响涡街流量计测量准确度的选型、安装、温度压力补偿、旋涡发生体迎流面堆积、配管内径与流量计内径不一致等因素,并提出了解决影响测量精度的具体方案。 相似文献
6.
武因超 《化学工业与工程技术》2005,26(3):43-45
结合化工行业流量仪表应用的实践,介绍了涡街流量计的测量原理,涡街流量计的选择和安装。提出了在化工行业的流量测量中使用涡街流量计的注意事项。 相似文献
7.
针对涡街流量计低流速的信号噪声问题,介绍基于MSP430数字涡街流量计的实验系统,探讨、研究噪声信号的处理.采用精度较高的称重法在流量实验标准装置上对数字涡街流量计进行标定.实验结果表明,运用MSP430功能强大的微处理器及高速运算能力,有效地扩大涡街的量程比,实现对涡街流量计的信号分析、处理,提高对噪声的抗干扰能力. 相似文献
8.
涡街流量计是现代石油化工行业中测量流量的重要工具之一;简述了涡街流量计的测量原理和主要优点,提供了涡街流量计的选型、安装、使用和维护的建议;通过规范设计、合理选型、正确的安装和维护,让涡街流量计在石油化工行业中发挥更大的作用。 相似文献
9.
高润冬;刘辰魁;李少领;王娟 《河北化工》2013,(11):77-79
流量计检定工作是在实验室标准装置下完成的,涡街流量计的一个重要参数是雷诺数,其变化对涡街流量计检定结果能产生一定的影响。对涡街流量计测量特性做了简要介绍,采用现场实验的方法,通过在型式评价实验室标准装置对仪表k系数标定的对比,对涡街流量计在不同介质、不同温度下雷诺数相似原理的体现进行了分析,检测结果表明,外部条件几何相似时,若涡街流量计的雷诺数相等,则其流体流动状态也几何相似。 相似文献
10.
11.
12.
离散液相对涡街流量计测量误差影响的实验研究 总被引:1,自引:1,他引:0
研究雾状流条件下,离散液相对涡街流量计测量误差的影响。对实验结果的进一步分析表明,均相流模型并不适合于涡街流量计在雾状流中的测量。实验在多相流装置上口径为50mm的水平管段上进行,在保证气相流量不变的条件下,研究了0-0.1%液相含率范围内涡街流量计的测量误差,涡街产生的频率值是通过对模拟信号进行傅立叶变换来获取的。利用数值仿真的方法研究了旋涡发生体上涡量场的变化,理论上解释了雾状流中涡街流量计测量误差产生的原因。 相似文献
13.
Two‐phase flow patterns in a mini‐hydrocyclone with different insertion depths of the vortex finder were measured by a phase Doppler particle analyzer. The distributions of velocity, concentration, root‐mean‐square velocity, and average diameter of particles were evaluated. A deeper insertion of the vortex finder led to smaller tangential velocity at the cross section near the column cone interface. When the vortex finder insertion depth did not reach the column cone interface, the vortex finder was inserted deeper and the line of zero velocity value migrated more distinctly inward. When the vortex finder insertion depth reached or exceeded the column cone interface, strong turbulence occurred near the vortex finder. The distributions of the axial velocities of particles and root‐mean‐square velocities indicated that circulation flow existed at the bottom part of the mini‐hydrocyclone. 相似文献
14.
Yi Ouyang Manuel Nunez Manzano Koenraad Beirnaert Geraldine J. Heynderickx Kevin M. Van Geem 《American Institute of Chemical Engineers》2021,67(7):e17264
The gas–liquid vortex reactor (GLVR) has substantial process intensification potential for multiphase processes. Essential in this respect is the micromixing efficiency, which is of great importance in fast reaction systems such as crystallization, polymerization, and synthesis of nanomaterials. By creating a vortex flow and taking advantage of the centrifugal force field, the liquid micromixing process can be intensified in the GLVR. Results show that introducing a liquid into a gas-only vortex unit results in suppression of primary and secondary gas flow. The Villermaux–Dushman protocol is applied to study the effects of the gas flow rate, liquid flow rate, and liquid viscosity based on a segregation index. Based on the incorporation model and reaction kinetics, the micromixing time of the GLVR is determined to be in the range of 10−4 ~ 10−3 s, which is comparable to the highly efficient rotating packed bed and substantially better than a static mixer. 相似文献
15.
16.
17.
18.
The detailed flow structures in bubble columns with and without internal draught tube have been investigated using the PIV technique. The onsets of transition due to vortex formation and different flow patterns with and without draught tube have been studied using the drift‐flux model and the experimentally measured Reynolds stresses. The role of solid particles and liquid viscosity, as well as bubbling orifice configuration on the flow patterns and regime transition has also been studied and discussed. 相似文献
19.
Rainier Hreiz Caroline GentricNoël Midoux Richard LainéDenis Fünfschilling 《Chemical Engineering Research and Design》2014
The gas–liquid swirl flow in a gas–liquid cylindrical cyclone separator has been characterized first qualitatively by flow visualizations. The emerged findings were then confirmed quantitatively by Laser Doppler Velocimetry measurements. The vortex core presents a very complex hydrodynamics, characterized by an alternation between a laminar and a turbulent state. The laminar regime is associated with velocities pointing in the same direction as the mean flow, while the turbulent state induces velocities in the opposite direction, i.e. a flow reversal. These observations give a first understanding of the origin of the double flow reversal regime that is encountered in swirl flows. It is shown that this flow structure appears for high swirl intensities, and results from a frequent laminarization of the vortex core. Results show that, contrary to the commonly assumed hypothesis, this flow structure is associated with good separation performance of the cyclone. Accordingly, we propose the use of multiple tangential inlets to generate the swirl motion in the cyclone, which is supposed to favor the double flow reversal regime, and thus, improve the separation efficiency. 相似文献