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Gas absorption in a hydraulic air compressor. Part II: Experimental verification
Chemical Engineering Science ( IF 4.7 ) Pub Date : 2022-07-25 , DOI: 10.1016/j.ces.2022.117870
M. Pourmahdavi , S.M. Young , A. Hutchison , C. Noula , D.L. Millar

Experimental verification of a one-dimensional steady-state bubbly flow model is presented. For initialisation of the liquid-phase concentrations of gas species, a formulation for modelling the time-evolution of the concentration of dissolved gas species in the circulating liquid of a hydraulic air compressor (HAC) was developed and integrated with the steady-state bubbly flow model. Observations from experiments conducted on a pilot scale HAC are presented employing CO2 as a tracer gas. The composition of the input gas inducted by the pilot HAC was deliberately varied by mixing different controlled amounts of CO2 gas while continuously monitoring the gas and liquid phase concentrations of CO2 at key points in the HAC process. Predictions of the concentration of CO2 in the compressed gas produced by the pilot HAC and the circulating liquid at system equilibrium were in good agreement with measured values. Concentrations of CO2 measured in the gas above the tailrace water level were elevated above background levels and responded in accordance with the input CO2 gas mass flow and liquid CO2 concentrations indicating exsolution of gas from the liquid as predicted. Observations of the pH of the circulating liquid identified the bicarbonate equilibrium as the likely mechanism for CO2(aq) production not captured by the model which caused the model to under predict CO2(aq) concentrations for experiment set points with CO2(aq) concentrations above 140 ppm.



中文翻译:

液压空气压缩机中的气体吸收。第二部分:实验验证

给出了一维稳态气泡流模型的实验验证。为了初始化气体物质的液相浓度,开发了一种用于模拟液压空气压缩机 (HAC) 循环液体中溶解气体物质浓度随时间演变的公式,并将其与稳态气泡流集成模型。展示了使用 CO 2作为示踪气体在中试规模 HAC 上进行的实验的观察结果。通过混合不同受控量的 CO 2气体,同时连续监测 CO 2的气相和液相浓度,有意改变试点 HAC 引入的输入气体的组成在 HAC 流程的关键点。对中试HAC产生的压缩气体和系统平衡循环液中CO 2浓度的预测与实测值吻合较好。在尾水水位以上的气体中测得的 CO 2浓度高于背景水平,并根据输入的 CO 2气体质量流量和液体 CO 2浓度做出响应,表明气体从液体中析出,如预测的那样。对循环液体的 pH 值的观察确定碳酸氢盐平衡是可能的机制一氧化碳2()模型未捕获的生产导致模型预测不足一氧化碳2()实验设定点的浓度一氧化碳2()浓度超过 140 ppm。

更新日期:2022-07-26
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