Three kinds of rotating-stream tray（RST）separators were designed and designated as S1,S2 and S3.The separator S1 had double flow paths,while S2 and S3 had single flow path.The trays of S1 and S2 were the same of the...Three kinds of rotating-stream tray（RST）separators were designed and designated as S1,S2 and S3.The separator S1 had double flow paths,while S2 and S3 had single flow path.The trays of S1 and S2 were the same of the double-path type,which was different from the conventional outward tray of S3.Measurements of three-dimensional flow in the three RST separators were conducted at the same total gas flow rate and streamlines were given through calculation according to the measured data.Compared with the RST separators S2 and S3,the separator S1 not only reduced the separation distance,but also effectively increased the tangential velocity,especially in the neighborhood of the separator center.The structure of tray vanes had a great effect on the velocity profiles,especially on the axial velocity profiles.The maximal axial velocities of S1 and S2 near the separator wall were much lower than that of S3.The maximal axial velocity of S1 decreased by above 37% against that of S3,which was favorable for reducing the secondary carry-over in the two-phase separation process.Streamlines showed that the separator S3 had vortex rings over the whole axial section,while the separator S1 had vortex ring only near the tray vanes.The separator outlet baffle could increase the tangential velocity,moderate the axial velocity,and reduce the centripetal velocity.展开更多
Droplet size distributions have been investigated with a two-probe system above a rotatingstream tray of 300 mm diameter.The measured distributions are found to follow the upper limitedlognormal distribution with thre...Droplet size distributions have been investigated with a two-probe system above a rotatingstream tray of 300 mm diameter.The measured distributions are found to follow the upper limitedlognormal distribution with three parameters dependent primarily on gas hole F-factor.A probabilitymethod is used to describe the initial state of the droplet population above the tray,and a model fordroplet motion is presented.The results computed with model agree well with experimental data.展开更多
The hydrodynamic characteristic of a new rotating stream tray (NRST) was investigated. The tests were carried out using an air-water/oxygen experimental system in a column with a diameter of 500 mm. The hydrodynamic p...The hydrodynamic characteristic of a new rotating stream tray (NRST) was investigated. The tests were carried out using an air-water/oxygen experimental system in a column with a diameter of 500 mm. The hydrodynamic parameters studied were dry plate pressure drop, wet plate pressure drop, weeping, entrainment, and Murphree liquid effi ciency. The results showed that the NRST has excellent performance in terms of high operational fl exibility. The pressure drop, weeping rate, and entrainment rate remained low even under a high-capacity operation. Correlations of pressure drop, weeping, and entrainment for the NRST were obtained by regression analysis. The results can provide some important theoretical guidance for the development of this type of trays.展开更多
文摘Three kinds of rotating-stream tray（RST）separators were designed and designated as S1,S2 and S3.The separator S1 had double flow paths,while S2 and S3 had single flow path.The trays of S1 and S2 were the same of the double-path type,which was different from the conventional outward tray of S3.Measurements of three-dimensional flow in the three RST separators were conducted at the same total gas flow rate and streamlines were given through calculation according to the measured data.Compared with the RST separators S2 and S3,the separator S1 not only reduced the separation distance,but also effectively increased the tangential velocity,especially in the neighborhood of the separator center.The structure of tray vanes had a great effect on the velocity profiles,especially on the axial velocity profiles.The maximal axial velocities of S1 and S2 near the separator wall were much lower than that of S3.The maximal axial velocity of S1 decreased by above 37% against that of S3,which was favorable for reducing the secondary carry-over in the two-phase separation process.Streamlines showed that the separator S3 had vortex rings over the whole axial section,while the separator S1 had vortex ring only near the tray vanes.The separator outlet baffle could increase the tangential velocity,moderate the axial velocity,and reduce the centripetal velocity.
基金Supported by the National and Zhejiang Provincial Natural Science Foundations.
文摘Droplet size distributions have been investigated with a two-probe system above a rotatingstream tray of 300 mm diameter.The measured distributions are found to follow the upper limitedlognormal distribution with three parameters dependent primarily on gas hole F-factor.A probabilitymethod is used to describe the initial state of the droplet population above the tray,and a model fordroplet motion is presented.The results computed with model agree well with experimental data.
基金supported by the Shenzhen Science and Technology Research and Development Fund (JCYJ20160331113033413 and JCYJ20150630114140637)
文摘The hydrodynamic characteristic of a new rotating stream tray (NRST) was investigated. The tests were carried out using an air-water/oxygen experimental system in a column with a diameter of 500 mm. The hydrodynamic parameters studied were dry plate pressure drop, wet plate pressure drop, weeping, entrainment, and Murphree liquid effi ciency. The results showed that the NRST has excellent performance in terms of high operational fl exibility. The pressure drop, weeping rate, and entrainment rate remained low even under a high-capacity operation. Correlations of pressure drop, weeping, and entrainment for the NRST were obtained by regression analysis. The results can provide some important theoretical guidance for the development of this type of trays.
