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Uncertainty Estimates of Tracer Gas Dilution Flow Measurements in Large-Scale Exhaust Ducts
Flow Measurement and Instrumentation ( IF 2.2 ) Pub Date : 2018-06-01 , DOI: 10.1016/j.flowmeasinst.2018.03.004
Rodney A Bryant 1
Affiliation  

Accurate measurements of volume or mass flow in large conduits can be difficult to achieve due to non-ideal flow characteristics such as asymmetry of the velocity profile and off-axis flow components due to swirl. The tracer gas dilution method is independent of these and other non-ideal flow characteristics, but relies on the conservation and uniform mixing of the tracer. This study demonstrates the application of the tracer gas dilution method to measure the volume flow in a large-scale exhaust duct used for flue gas venting. The estimated measurement uncertainty was less than ± 3.5% and considered contributions from instrumentation, degree of mixing, and repeatability of the method. This level of uncertainty demonstrates that the method can be applied as an independent comparison or quality check for other flow measurement methods in large exhaust ducts or flow conduits.

中文翻译:

大型排气管中示踪气体稀释流量测量的不确定度估计

由于非理想的流动特性,例如速度分布的不对称性和涡流引起的离轴流动分量,可能难以准确测量大型管道中的体积或质量流量。示踪气体稀释方法与这些和其他非理想流动特性无关,而是依赖于示踪剂的守恒和均匀混合。本研究展示了示踪气体稀释法在用于排放烟道气的大型排气管中测量体积流量的应用。估计的测量不确定度小于 ± 3.5%,并考虑了仪器、混合程度和方法可重复性的影响。
更新日期:2018-06-01
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