Hollow fiber MFI zeolite membranes were modified by catalytic cracking deposition of methyldiethoxysilane to enhance their H 2 /CO 2 separation performance and further used in high temperature water gas shift membrane reactor. Steam was used as the sweep gas in the MR for the production of pure H 2 . Extensive investigations were conducted on MR performance by variations of temperature, feed pressure, sweep steam flow rate, and steam-to-CO ratio. CO conversion was obviously enhanced in the MR as compared with conventional packed-bed reactor (PBR) due to the coupled effects of H 2 removal as well as counter-diffusion of sweep steam. Significant increment in CO conversion for MR vs. PBR was obtained at relatively low temperature and steam-to-CO ratio. A high H 2 permeate purity of 98.2% could be achieved in the MR swept by steam. Moreover, the MR exhibited an excellent long-term operating stability for 100 h in despite of the membrane quality.
The environment vibration induced by urban rail transit becomes one of the severe environmental hazards and attracted great attention for researcher at home and abroad. Firstly,on the basis of track irregularity theory, an exciting force function of vibration source induced by ground line train is established. Then, the exciting force acts on the three-dimensional models of rail bearing structure and soil propagation path by utilizing the finite element software. The surrounding environment vibration response caused by train operation is simulated and the numerical results are compared and verified by the field measurement data. Furthermore, the parameter effects of train speed and properties of site soil on environment vibration are studied. The researches show that the numerical simulation in the paper can truly reflect the actual environment vibration caused by urban rail transit with ground line.
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