Artificial Immune Network （aiNet） algorithms have become popular for global optimization in many modem industrial applications. However, high-dimensional systems using such models suffer from a potential premature c...Artificial Immune Network （aiNet） algorithms have become popular for global optimization in many modem industrial applications. However, high-dimensional systems using such models suffer from a potential premature convergence problem. In the existing aiNet algorithms, the premature convergence problem can be avoided by implementing various clonal selection methods, such as immune suppression and mutation approaches, both for single population and multi-population cases. This paper presents a new Multi-Agent Artificial Immune Network （Ma-aiNet） algorithm, which combines immune mechanics and multiagent technology, to overcome the premature convergence problem in high-dimensional systems and to efficiently use the agent ability of sensing and acting on the environment. Ma-aiNet integrates global and local search algorithms. The perform- ance of the proposed method is evaluated using 10 benchmark problems, and the results are compared with other well-known intelligent algorithms. The study demonstrates that Ma-aiNet outperforms other algorithms tested. Ma-aiNet is also used to determine the Murphree efficiency of a distillation column with satisfactory results.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
The Intalox metal tower packing was used to simulate an industrial relevant extractive distillation column for purifying azeotropic multicomponent mixture.In order to explain the inconsistencies in the modeling of tra...The Intalox metal tower packing was used to simulate an industrial relevant extractive distillation column for purifying azeotropic multicomponent mixture.In order to explain the inconsistencies in the modeling of transfer process in nonideal multicomponent distillation column,a method was developed with equilibrium stage models(EQ)and non-equilibrium model(NEQ)incorporated with Maxwell-Stefan diffusion equations in the framework of AspenONE simulator.Dortmund Modified UNIFAC(UNIFAC-DMD)thermodynamic model was employed to estimate activity coefficients.In addition,to understand the reason for the diffusion against driving force and the different results by EQ and NEQ models,explicit investigations were made on diffusion coefficients, component Murphree efficiency and mass transfer coefficients.The results provide valuable information for basic design and applications associated with extractive distillation.展开更多
A series of well-designed deflectors were used to regulate the liquid flow behaviour on the 95-Ⅱ tray. A multiple-plug flow pattern was observed in each liquid flow channel between two deflectors on the tray.On a tes...A series of well-designed deflectors were used to regulate the liquid flow behaviour on the 95-Ⅱ tray. A multiple-plug flow pattern was observed in each liquid flow channel between two deflectors on the tray.On a test rig with a diameter of 1000 mm, the liquid layer temperature profiles in the vertical and horizontal directions were measured by resistivity thermal detectors(RTDs).An oxygen desorption experiment was carried out and the oxygen concentration in the inlet liquid and the outlet liquid were determined by iodimetry,through which the liquid phrase Murphree tray efficiency(E ML) was calculated. The results show that the well-designed and placed deflectors on the tray can obviously increase the tray efficiency by almost 30% under the same operating conditions.展开更多
基金Acknowledgments This work was supported by the National Science Fund for Distinguished Young Scholars （No.60625302）, National Natural Science Foundation of China （2009CB320603）, Shanghai Key Technologies R＆D Program（10JC1403500）, Chang3iang Scholars and In- novative Research Team in University（IRT0721）, the 111 Project（B08021）, Shanghai Leading Academic Discipline Project（B504） and Zhejiang Natural Science Fund （Y1090548）.
文摘Artificial Immune Network （aiNet） algorithms have become popular for global optimization in many modem industrial applications. However, high-dimensional systems using such models suffer from a potential premature convergence problem. In the existing aiNet algorithms, the premature convergence problem can be avoided by implementing various clonal selection methods, such as immune suppression and mutation approaches, both for single population and multi-population cases. This paper presents a new Multi-Agent Artificial Immune Network （Ma-aiNet） algorithm, which combines immune mechanics and multiagent technology, to overcome the premature convergence problem in high-dimensional systems and to efficiently use the agent ability of sensing and acting on the environment. Ma-aiNet integrates global and local search algorithms. The perform- ance of the proposed method is evaluated using 10 benchmark problems, and the results are compared with other well-known intelligent algorithms. The study demonstrates that Ma-aiNet outperforms other algorithms tested. Ma-aiNet is also used to determine the Murphree efficiency of a distillation column with satisfactory results.
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.
基金Supported by the National Natural Science Foundation of China （20776118）, Science ＆ Technology Bureau of Xi＇an [CXY09019 （1）], Innovation Foundation for Graduated Student of Northwest University （08YJC21）, Shaanxi Research Center of Engineering Technology for Clean Coal Conversion （2008ZDGC-13）.
文摘The Intalox metal tower packing was used to simulate an industrial relevant extractive distillation column for purifying azeotropic multicomponent mixture.In order to explain the inconsistencies in the modeling of transfer process in nonideal multicomponent distillation column,a method was developed with equilibrium stage models(EQ)and non-equilibrium model(NEQ)incorporated with Maxwell-Stefan diffusion equations in the framework of AspenONE simulator.Dortmund Modified UNIFAC(UNIFAC-DMD)thermodynamic model was employed to estimate activity coefficients.In addition,to understand the reason for the diffusion against driving force and the different results by EQ and NEQ models,explicit investigations were made on diffusion coefficients, component Murphree efficiency and mass transfer coefficients.The results provide valuable information for basic design and applications associated with extractive distillation.
文摘A series of well-designed deflectors were used to regulate the liquid flow behaviour on the 95-Ⅱ tray. A multiple-plug flow pattern was observed in each liquid flow channel between two deflectors on the tray.On a test rig with a diameter of 1000 mm, the liquid layer temperature profiles in the vertical and horizontal directions were measured by resistivity thermal detectors(RTDs).An oxygen desorption experiment was carried out and the oxygen concentration in the inlet liquid and the outlet liquid were determined by iodimetry,through which the liquid phrase Murphree tray efficiency(E ML) was calculated. The results show that the well-designed and placed deflectors on the tray can obviously increase the tray efficiency by almost 30% under the same operating conditions.
