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    • 7. 发明申请
    • ULTRASONIC MEASUREMENT SYSTEM WITH MOLECULAR WEIGHT DETERMINATION
    • 超声波测量系统具有分子量测定
    • WO00019176A1
    • 2000-04-06
    • PCT/US1999/022408
    • 1999-09-27
    • F16K31/02F17D3/01G01F1/66G01F17/00G01N29/02
    • G01F1/667G01F1/668G01N2291/02836G01N2291/02881Y10T137/2541
    • An ultrasonic measurement system performs a signal path measurement by directing ultrasonic signals through a gaseous material in a conduit, and processing the detected signals to determine sound speed and to derive the average molecular weight of an unknown hydrocarbon mixture present in the material. The processor includes a plurality of stored tables of critical constants of hydrocarbon mixtures as a function of the average molecular weight of the mixture, and is configured to iteratively set a hypothetical molecular weight, determine the corresponding critical properties, and compute a predicted sound speed. If the two speeds differ, a new weight is set and the procedure is repeated until the predicted sound speed matches the measured speed, indicating that the current estimate is the correct average molecular weight. Once the processor has determined the critical constants from its stored tables, it applies the virial equation of state and mixing rules to determine the predicted sound speed for each hypothetical molecular weight of an unknown mixture of hydrocarbons present, together with one or more known inorganic components, in the fluid material. The processor may be configured for user input of known quantities of one or more gases such as nitrogen, hydrogen, sulfur dioxide, carbon dioxide or other inorganic or non-hydrocarbon gases present in the conduit. Alternatively, all or some of this data may be provided in an automated manner from suitable signals, settings or measurements from upstream conduits, valves of measurement and control instrumentation.
    • 超声波测量系统通过将超声波信号引导通过管道中的气态材料来执行信号路径测量,并处理检测到的信号以确定声速并导出材料中存在的未知烃混合物的平均分子量。 处理器包括作为混合物的平均分子量的函数的烃混合物的关键常数的多个储存表,并且被配置为迭代地设置假设分子量,确定相应的临界特性并计算预测的声速。 如果两个速度不同,则设定一个新的重量,并重复该过程,直到预测的声速匹配测量的速度,表明当前的估计是正确的平均分子量。 一旦处理器从其存储的表中确定关键常数,则它应用状态方程和混合规则,以确定存在的烃的未知混合物的每个假设分子量的预测声速,以及一种或多种已知的无机组分 ,在流体材料中。 处理器可以被配置为用户输入已知量的一种或多种气体,例如存在于管道中的氮气,氢气,二氧化硫,二氧化碳或其他无机或非烃气体。 或者,可以以适当的信号,来自上游管道的设置或测量,测量和控制仪器的阀门以自动方式提供该数据的全部或一些。