| 摘要 |
The invention relates to measuring quantity and composition of gas and liquids transported via pipelines. The inventive method for flow metering and forming a fluid medium sample in a pipeline involves passing a fluid medium flow through the grid of a straightening vane, a nozzle and a diffuser, wherein, on a path between the straightening vane and the nozzle, the portion of fluid medium enters the first static high pressure measuring cavity, on the section downstream of the nozzle, the portion of fluid medium enters the second static low-pressure measuring pressure cavity, and, prior to the diffuser, the portion of fluid medium enters a side fluid medium sample forming cavity for subsequently determining the composition of said sample. The inventive device for flow metering and forming a fluid medium sample comprises the following components in series arranged along a common axis: the straightening vane, a cylindrical high-pressure chamber, the nozzle, a low-pressure chamber, a sampling chamber and the diffuser. The high-pressure chamber is coupled to an annular high-pressure measuring chamber which embraces it, the low-pressure chamber is coupled to an annular low-pressure measuring chamber which embraces it, and the sampling chamber is coupled to an annular chamber which is used for additionally stirring samples and embraces said sampling chamber.
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