Method for determining properties of a hydrocarbon containing gas mixture and apparatus therefor

    公开(公告)号:US10788475B2

    公开(公告)日:2020-09-29

    申请号:US15768013

    申请日:2016-09-08

    IPC分类号: G01N33/22

    摘要: A method for determining properties of a hydrocarbon containing gas mixture, especially natural gas or biogas, comprising: allowing the gas mixture to flow through a measuring arrangement; determining a pressure- and temperature dependent viscosity measured value, an associated measured value of temperature and an associated pressure measured value of the flowing gas mixture; ascertaining a first value of a first variable, which characterizes the energy content of the flowing gas mixture, based on viscosity measured value, the associated measured value of temperature, and the associated pressure measured value, wherein the first variable characterizing the energy content is the Wobbe index or the calorific value of the flowing gas mixture, wherein the Wobbe index is preferable.

    METHOD FOR DETERMINING THE METHANE INDEX OF A HYDROCARBON-CONTAINING COMBUSTION GAS MIXTURE

    公开(公告)号:US20200041479A1

    公开(公告)日:2020-02-06

    申请号:US16499517

    申请日:2018-02-15

    IPC分类号: G01N33/22 F02M37/00

    摘要: The present disclosure relates to a method for determining the methane index of a hydrocarbon-containing combustion gas mixture which has natural gas or biogas, having the steps: flowing the gas mixture through a measuring assembly; determining a first value of a first measurement variable related to a viscosity of the gas mixture; determining a second value of a second measurement variable related to a density of the gas mixture; determining a pressure value of the gas mixture, said pressure value belonging to the first value and the second value; determining a temperature value of the gas mixture, said temperature value belonging to the first value and the second value; and determining the methane index as a function of the first value, the second value, the pressure value, and the temperature value.

    Process of determining at least one thermal property of a fluid under investigation with a thermal sensor

    公开(公告)号:US20180172610A1

    公开(公告)日:2018-06-21

    申请号:US15579983

    申请日:2016-05-24

    IPC分类号: G01N25/18 G01K17/00 G01K15/00

    摘要: A Process of determining at least one thermal property of a fluid under investigation with a thermal sensor. The thermal sensor has at least a first sensor element that is heated to provide heat to the fluid under investigation. The first or a second sensor that can sense the temperature of the fluid under investigation, wherein the process is characterized by the following steps: a) Providing a calibrated reduced order model which is calibrated with one or more thermal properties of at least a second and a third fluid; b) (Applying an amount of heat to the fluid under investigation by the first sensor element and) measuring the temperature Tsens at the first and/or second sensor element said fluid under investigation; and c) Extracting one or more thermal property of the fluid under investigation by applying the said temperature Tsens to said calibrated reduced order model.

    Method for determining properties of a hydrocarbon-containing gas mixture and device for the same

    公开(公告)号:US11474092B2

    公开(公告)日:2022-10-18

    申请号:US16348139

    申请日:2017-10-10

    摘要: A method for determining properties of a hydrocarbon-containing gas mixture includes determining a thermal conductivity value, density measurement, viscosity measurement, and temperature and pressure. The method also includes determining a hydrogen content of the gas mixture on the basis of the thermal conductivity value and the temperature and pressure, determining a density measurement and associated temperature and pressure, and determining the mean molar mass or standard density on the basis of the density measurement and the temperature and pressure. The method further includes determining the mean molar mass or standard density of a hydrogen-free residual gas mixture based on the mean molar mass or standard density and the hydrogen fraction, determining the Wobbe index of the residual gas mixture based on the viscosity measurement and the temperature and pressure, and determining a calorific value based on the mean molar mass or standard density and the Wobbe index.

    Method for thermally determining mass flow of a gaseous medium and thermal mass flow meter

    公开(公告)号:US09671266B2

    公开(公告)日:2017-06-06

    申请号:US14395627

    申请日:2013-03-19

    IPC分类号: G01F1/68 G01F1/696

    CPC分类号: G01F1/696 G01F1/6965

    摘要: A method for determining mass flow of a gas by means of a mass flow meter, which has a first and a second temperature sensor, which can be flowed around by the gas. The first temperature sensor is heated with a heating power Q, wherein the mass flow of the medium is determined by means of a power coefficient PC=Q/ΔT as a function of a heating power Q and a temperature difference ΔTm=T1−T2 between the measured values of the temperature sensor. A corrected power coefficient PCcorr is determined, wherein at least one correction occurs by means of at least one recovery correction term Ki, wherein the recovery correction term Ki has the form Ki=Δx·u2/(2·cp), wherein u is the flow velocity and cp the heat capacity of the medium, Δx is an element of the set {Δ1; Δ2; Δ12}, Δ1:=e1−cr, Δ2:=e2−cr and Δ12:=e1−e2=Δ1−Δ2, e1 and e2 are the recovery factors of the first, respectively second, temperature sensors, and wherein cr is a constant reference value, for which holds cr≦1, especially cr=1.

    METHOD FOR THERMALLY DETERMINING MASS FLOW OF A GASEOUS MEDIUM AND THERMAL MASS FLOW METER
    20.
    发明申请
    METHOD FOR THERMALLY DETERMINING MASS FLOW OF A GASEOUS MEDIUM AND THERMAL MASS FLOW METER 有权
    用于温度测定气体介质和热质流量计的质量流量的方法

    公开(公告)号:US20150075277A1

    公开(公告)日:2015-03-19

    申请号:US14395627

    申请日:2013-03-19

    IPC分类号: G01F1/696

    CPC分类号: G01F1/696 G01F1/6965

    摘要: A method for determining mass flow of a gas by means of a mass flow meter, which has a first and a second temperature sensor, which can be flowed around by the gas. The first temperature sensor is heated with a heating power Q, wherein the mass flow of the medium is determined by means of a power coefficient PC=Q/ΔT as a function of a heating power Q and a temperature difference ΔTm=T1−T2 between the measured values of the temperature sensor. A corrected power coefficient PCcorr is determined, wherein at least one correction occurs by means of at least one recovery correction term Ki, wherein the recovery correction term Ki has the form Ki=Δx·u2/(2·cp), wherein u is the flow velocity and cp the heat capacity of the medium, Δx is an element of the set {Δ1; Δ2; Δ12}, Δ1:=e1−cr, Δ2:=e2−cr and Δ12:=e1−e2=Δ1−Δ2, e1 and e2 are the recovery factors of the first, respectively second, temperature sensors, and wherein cr is a constant reference value, for which holds cr≦1, especially cr=1.

    摘要翻译: 一种用于通过质量流量计测定气体的质量流量的方法,所述质量流量计具有第一和第二温度传感器,该第一和第二温度传感器可以由气体流动。 第一温度传感器用加热功率Q加热,其中介质的质量流量通过功率系数PC = Q /&Dgr; T作为加热功率Q和温度差Dgr的函数确定; Tm = T1-T2之间的温度传感器的测量值。 确定校正功率系数PCcorr,其中通过至少一个恢复校正项Ki进行至少一次校正,其中恢复校正项Ki具有Ki =&Dgr; x·u2 /(2·cp)的形式,其中u 是流速,cp是介质的热容量,Dgr; x是集合{&Dgr; 1; &Dgr; 2; &Dgr; 12},&Dgr; 1:= e1-cr,&Dgr; 2:= e2-cr和&Dgr; 12:= e1-e2 =&Dgr; 1-&Dgr; 2,e1和e2是第一个 ,分别是第二温度传感器,其中cr是恒定的参考值,其保持cr≦̸ 1,特别是cr = 1。