摘要:
气液两相流广泛存在于化工、动力、炼油、油气开采与输送等领域,其参数的传感与测量是工业系统中难以回避的一个难题。提出一种双锥结构的新型差压式流量测量方法,设计并加工了直径比分别为0.5、0.6、0.7、0.8和0.9的双锥流量计,分析了不同直径比双锥流量计对单相介质的测量特性。以空气和水为介质,开展了水平管气液两相流流量测量实验研究。通过分析准气相流量比与 Lockhart-Martinelli 常数的关系,基于分相流理论建立了适合双锥流量计的两相流流量测量模型。实验结果表明,在不同直径比下准气相流量比与 Lockhart-Martinelli常数均具有优良的线性关系,流量测量模型对气液两相流总流量测量的误差可在6%以内。
关键词:
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双锥流量计
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气液两相流
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流量
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测量
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模型
Abstract:
Gas-liquid two-phase flow is encountered in chemical,power engineering,petrole-um refining,energy conversion and other industries.The parameter measurement and behavior investigation of two component flow are problems difficult to avoid for monitoring industrial sys-tems.A new flow sensing method based on a differential pressure flowmeter of a double cone structure is proposed.The new double-cone flowmeter is developed based on the V-Cone flowme-ter,which has advantages of simple and stable structure,convenient processing,and not easy to wear,etc.Five double-cone flowmeters with different diameter ratios which are 0.5,0.6,0.7, 0.8 and 0.9 are designed and manufactured.The measurement characteristics of the flowmeters for the single flow are analyzed.The total mass flowrate of gas-liquid two-phase flow is measured using the differential pressure signals.The experimental studies are conducted on the gas-liquid two-phase flow in the horizontal pipe by using the five new double-cone flowmeters.Through a-nalysis of the relationship between Lockhart-martinelli number and prospective gas flow ratio, the total mass flowrate measurement models for the total mass flowrate of gas-liquid two-phase flow are established on the basis of separated flow theory.The experimental results show that the prospective gas flow ratio has a good linear relation with the Lockhart-martinelli number. And the coefficients of the models are obtained through linear fitting.The seperated model,the Murdock model,the Lin model and the proposed models are applied to measure the total mass flowrate,and the measurement errors are analyzed and compared.The results show that the pro-posed models are more suitable than the other three models for the new doble-cone flowmeters that the total mass flowrate measurement errors of the proposed models can be within 6%.These results show that combined with the new proposed models,the new double-cone flowmeters per-form well in the flowrate measurement of the air-water two-phase flow.
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