基于音速喷嘴装置的气体容积式流量计工况标况转换特性研究
Study on the Standard Condition Conversion Characteristics of Gas Displacement Flowmeter Based on the Sound Velocity Nozzle Device
本文设计并搭建了一套基于音速喷嘴法气体流量标准装置的测试系统，旨在深入研究气体容积式流量计的工况/标况转换特性。通过采用“空气介质+参数模拟”的实验方法，在实际通入空气的条件下，调整体积修正仪的关键参数，模拟不同种类天然气在实际工况下的转换。实验研究了不同模拟工作压力及模拟气体组分对一台DN80罗茨流量计转换精度的影响。结果表明：当体积修正仪参数设置准确时，标况体积转换误差可稳定控制在±0.15%以内；而模拟工作压力从0.2MPa升高至0.5MPa时，若压力测量存在0.5%的正偏差，将导致转换结果产生约+0.63%的系统性误差。本研究验证通过参数模拟进行流量计转换特性研究的可行性，为流量计选型、现场参数设置及系统误差分析提供了重要的实验依据。
This study designed and established a testing system based on a standard gas flow measurement device using the sonic nozzle method, aiming to conduct in-depth research on the working condition/standard condition conversion characteristics of gas volumetric flowmeters. By employing an experimental approach of “air medium + parameter simulation,” the key parameters of the volumetric correction instrument were adjusted under actual air injection conditions to simulate conversion characteristics of various natural gas types under real-world operating conditions. The experiment investigated the impact of different simulated working pressures and gas compositions on the conversion accuracy of a DN80 Roots flowmeter. Results demonstrated that when the volumetric correction instrument parameters were accurately set, the standard condition volume conversion error could be stably controlled within ±0.15%. However, when the simulated working pressure increased from 0.2MPa to 0.5MPa, a 0.5% positive deviation in pressure measurement would result in approximately +0.63% systematic error in conversion results. This study validates the feasibility of parameter simulation for flowmeter conversion characteristic research, providing crucial experimental evidence for flowmeter selection, field parameter configuration, and system error analysis.
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