Vortex-induced vibration is likely to occur when subjected to wind loads because of low horizontal stiffness,resulting in internal force and large lateral amplitude.Long-term wind-induced vibration can not only affect...Vortex-induced vibration is likely to occur when subjected to wind loads because of low horizontal stiffness,resulting in internal force and large lateral amplitude.Long-term wind-induced vibration can not only affect the normal service and durability performance of chemical towers,but also seriously endanger the safety of towers in service periods,and cause property losses.In this study,a passive control method for suppressing wind-induced vibration of chemical towers is proposed.The flow around the flow field is guided by a pre-set air-blowing channel,thus destroying the unsteady vortex shedding in the wake region of the flow field and achieving the purpose of flow control.Two accelerometers are used to measure the vibration signal of the chemical tower model with and without the perforated pipe.The control effects of the spacing and the installation position of the perforated pipe are then studied.Experimental results show that the passive perforated pipe control method can effectively reduce the vibration amplitude of the chemical tower under wind loads,and decrease the potential wind-induced vibration.展开更多
Inverted batch distillation column(stripper) is opposed to a conventional batch distillation col-umn(rectifier). It has a storage vessel at the top and products leave the column at the bottom. The batch stripper is fa...Inverted batch distillation column(stripper) is opposed to a conventional batch distillation col-umn(rectifier). It has a storage vessel at the top and products leave the column at the bottom. The batch stripper is favourable to separate mixtures with a small amount of light components by removing the heavy components as bottom products. In this paper, we are presenting a shortcut procedure based on our earlier work for design and simulation of the inverted batch distillation column, which is equivalent to the Fenske-Underwood-Gilliland procedure for continuous distillation. Given a separation task, we propose to compute the minimum number of stages(Nbmin) and the minimum reboil ratio(Rbmin) required in a batch stripper,which are the stages and reboil ratio required in a hypothetical inverted batch distillation column operating in total reboil ratio or having an infinite number of stages, respectively. Then, it is shown that the performance of inverted batch columns with a finite number of stages and reboil ratios could be correlated in Gilliland coordinates with the minimum stages Nbmin and the minimum reboil ratio Rbmin.展开更多
基金This work was supported by the National Natural Science Foundation of China(Nos.51578188,51722805,51378153 and 51808173)the Fundamental Research Funds for Central Universities(HIT.BRETIII.201512,HIT.BRETIV.201803 and HIT.NSRIF.201862).
文摘Vortex-induced vibration is likely to occur when subjected to wind loads because of low horizontal stiffness,resulting in internal force and large lateral amplitude.Long-term wind-induced vibration can not only affect the normal service and durability performance of chemical towers,but also seriously endanger the safety of towers in service periods,and cause property losses.In this study,a passive control method for suppressing wind-induced vibration of chemical towers is proposed.The flow around the flow field is guided by a pre-set air-blowing channel,thus destroying the unsteady vortex shedding in the wake region of the flow field and achieving the purpose of flow control.Two accelerometers are used to measure the vibration signal of the chemical tower model with and without the perforated pipe.The control effects of the spacing and the installation position of the perforated pipe are then studied.Experimental results show that the passive perforated pipe control method can effectively reduce the vibration amplitude of the chemical tower under wind loads,and decrease the potential wind-induced vibration.
文摘Inverted batch distillation column(stripper) is opposed to a conventional batch distillation col-umn(rectifier). It has a storage vessel at the top and products leave the column at the bottom. The batch stripper is favourable to separate mixtures with a small amount of light components by removing the heavy components as bottom products. In this paper, we are presenting a shortcut procedure based on our earlier work for design and simulation of the inverted batch distillation column, which is equivalent to the Fenske-Underwood-Gilliland procedure for continuous distillation. Given a separation task, we propose to compute the minimum number of stages(Nbmin) and the minimum reboil ratio(Rbmin) required in a batch stripper,which are the stages and reboil ratio required in a hypothetical inverted batch distillation column operating in total reboil ratio or having an infinite number of stages, respectively. Then, it is shown that the performance of inverted batch columns with a finite number of stages and reboil ratios could be correlated in Gilliland coordinates with the minimum stages Nbmin and the minimum reboil ratio Rbmin.
