【作者】 魏鸣；

【导师】 张涛；

【作者基本信息】 天津大学 ， 检测技术与自动化装置， 2004， 硕士

【摘要】 气液两相流是工业领域中一种常见的流动形态。作为气液两相流的一种,湿气广泛存在于石油、化工、能源等各个行业,因此湿气参数(流量、干度等)的测量技术也变得日益重要。目前对于湿气参数测量的研究还处于发展阶段,没有一种湿气测量设计方案能够证明完全满足工业对精度的需要。传统的分离法、差压式流量计和多传感器组合法还是主要的湿气计量方法。国外研究人员在利用组合法测量湿气组分方面已经取得较大进展,而国内这方面的研究还不多见。本课题采用文丘里管和涡街流量计组合进行湿气组分测量,并在此基础上开发出一套湿气流量计信号处理系统。主要工作和成果如下:1.首次实现文丘里管加涡街流量计的湿气组分测量方式,提出了这种组合方式的基本思路、研究方案和需要解决的问题。2.在对传统节流装置湿气测量模型进行比较的基础上,建立了文丘里管收缩段差压信号及涡街频率信号与气液两相流参数(总质量流量、干度)之间的关系式。3.对文丘里管出口处的流型进行计算流体力学仿真,验证了其出口流型符合均相模型的要求。4.研制出一台样机,设计并建立了一套文丘里管加涡街流量计的湿气测量装置。传感器中的文丘里管按照最新ISO5167标准设计制造,转换器是以MSP430单片机为核心的湿气流量计信号处理系统。5.对样机进行模拟实验,实验结果表明测量精度与文丘里管喉部差压的采样精度密切相关。同时证明本装置可以实现湿气的双参数测量,测量精度能够满足需要。?PTP更多还原

【Abstract】 Gas-liquid two-phase flow is a common flow system in the industrial process.Wet gas, as a kind of gas-liquid two-phase flow, is widely used in petroleum, chemicaland energy industry. The measurement of wet gas parameters, such as flow rate, voidfunction, is becoming an increasingly important technique.Currently, wet gas metering is still a developing technology. No meter design hasyet to prove itself to be capable of metering wet gas flows to the accuracy desired byindustry. Traditional separator, differential pressures meter and multi-flowmeterscombination method predominate in wet gas metering. The foreign researchers havemade great achievements in wet gas metering using combination method these years,but the domestic research in this field is rare.In this dissertation, the author studied mainly the method for the wet gasmetering based on the combination of Venturi tube and Vortex meters. In the research,the following achievements have been made.1. A novel method for the wet gas metering with the combination of Venturi tubeand Vortex meters is presented for the first time, and problems need to be solved areanalyzed.2. The correlations between the differential pressure of the constriction segmentof Venturi tube, frequency signal of Vortex meters and parameters of gas-liquidtwo-phase flow are constructed based on comparison among methods of wet gasmetering with differential pressure meters.3. The flow model at Venturi tube exit is emulated using FLUENT and the resultproves the model accords with the homogeneous flow model.4. A specimen device is developed and a wet gas metering equipment based oncombination of Venturi tube and Vortex meters is constructed. The Venturi tube isdesigned under the ISO5167(2003) standard and the transformer based on MSP430signal process systrm.5. A simulation experiment is finished with the specimen device. The resulttestify the equipment is competent for the wet gas parameters measurement.更多还原