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Apparatus and method for determining a non-condensable gas parameter

A gas parameter and gas technology, applied in the direction of measuring devices, thermal effects to detect fluid flow, material condensation, etc., can solve the problem of inaccurate non-condensable gas

Active Publication Date: 2015-03-25
SPIRAX SARGO LTD
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Problems solved by technology

[0007] However, where the flow rate of the fluid stream is variable and where the corresponding vapor stream has a varying proportion of noncondensable gas, the estimate of the proportion of noncondensable gas can be inaccurate

Method used

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  • Apparatus and method for determining a non-condensable gas parameter
  • Apparatus and method for determining a non-condensable gas parameter
  • Apparatus and method for determining a non-condensable gas parameter

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example

[0089] The invention will now be illustrated using an exemplary simplified fluid flow.

[0090] In this example, the noncondensable gas determination unit 34 determines the noncondensable gas parameters over a sampling period of 10 seconds. For the first 5 seconds of the sampling period, the flow velocity of the fluid stream was 2 m / s, and the durations of the alternating segments of condensate and noncondensable gas were 1 second and 0.02 seconds, respectively. After five seconds, the flow rate increased to 5 m / s and the duration of alternating segments of condensate and noncondensable gas was 1 second and 0.04 seconds respectively (only the last segment of condensate was monitored for 0.7 seconds).

[0091] Thus, over the 10 second sampling period, the noncondensable gas increases in flow during the last five seconds due to the length of time the noncondensable gas segment increases and the fluid flow increases in velocity.

[0092] figure 2 The phase signal and flow velo...

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Abstract

System and methods for determining a non-condensable gas parameter relating to the amount of non-condensable gas within a variable flow rate fluid flow containing both non-condensable gas and condensate are disclosed. An apparatus may include a measurement tube for receiving the fluid flow and arranged such that the fluid flow through the measurement tube comprises alternating sections of non-condensable gas and condensate; a flow sensor for generating a flow rate signal relating to the flow rate of the fluid flow in the measurement tube; a phase sensor for monitoring over time the alternating sections of non-condensable gas and condensate flowing through the measurement tube and arranged generates a phase signal characteristic of the said sections monitored; and a non-condensable gas determining unit configured to determine a non-condensable gas parameter relating to the amount of non-condensable gas in the fluid flow based on the flow rate signal and phase signal. A related method for determining a non-condensable gas parameter is disclosed also.

Description

technical field [0001] The present invention relates to an apparatus and method for determining a noncondensable gas parameter related to the amount of noncondensable gas within a fluid flow containing both noncondensable gas and condensate. Background technique [0002] The presence of a noncondensable gas, such as air, within a vapor stream can significantly alter the characteristics of the vapor stream. For example, noncondensable gases can affect the heat transfer characteristics of a vapor stream. Additionally, non-condensable gases can cause non-uniform steam properties within the steam flow, such as regions of superheated steam and regions of saturated steam. [0003] In many industrial processes it is desirable to minimize the amount of noncondensable gas within the vapor stream. One such example is the sterilization of products and / or equipment in steam streams in the pharmaceutical and pharmaceutical industry, for example. If the amount of noncondensable gas in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/02
CPCG01N29/032G01N2291/02433G01N2291/02818G01N2291/02836G01N25/142G01N25/60G01F1/66G01F1/05G01F1/68
Inventor N·伊斯拉姆P·亚瑟B·弗里斯比D·奥利弗
Owner SPIRAX SARGO LTD
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