科研之友
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摘要
Based on the framework of the rotating zigzag bed (RZB), the crossflow concentric-baffle rotating bed (CRB) was proposed, with the rotor containing a set of perforated concentric baffles. In the first paper in this series, the distillation performance of the CRB was studied and compared with that of the RZB. It was found that the CRB showed the poorer mass-transfer efficiency than the RZB, which led to an obvious loss in pressure drop and shaft power. Three possible main factors affecting the mass-transfer performance of the CRB (i.e., liquid distribution, seal, and flow pattern) were identified and experimentally investigated. The results revealed that the CRB had a good liquid self-distribution and could dispense with the liquid distributor. The elimination of the liquid distributor significantly enhanced the mass-transfer performance despite a moderately higher pressure drop. For the CRB, the gland seal was preferred due to its great advantage over labyrinth seal in mass transfer, although it caused an additional power consumption, which could be reduced by the selection of proper seal materials. The introduction of counter-current contact in the CRB rotor could not improve its mass-transfer performance but, instead, increased the pressure drop and shaft power required. The favorable gas liquid contact pattern in the CRB rotor was crosscurrent. The optimized CRB was obtained based on the above results. and compared with the RZB. The comparison demonstrated that, when the size of the rotor was same, the optimized CRB showed no poorer mass-transfer performance, much lower pressure drop, and shaft power than the RZB especially at the higher loads. Therefore, the optimized CRB could be potentially applied in gas liquid contacting processes with a larger throughput.
- 出版日期2014-3-12
- 单位浙江工业大学
