| CO2absorption is one of the promising technologies to mitigate global climatechange. The packed tower is the most widely used equipment. As is well known, thestructure of column internals, especially for the large-diameter packed columns, has akey influence on the whole tower performance. As a result, the packing with a betterhydrodynamic performance and higher transfer efficiency are indispensable, as wellas gas distributors.In this work, both the hydrodynamic experiments and computational fluiddynamics （CFD） simulation were adopted to develop novel column internals with alarger flux, lower pressure drop and higher transfer efficiency in large-diameterpacked tower, such as new structured packing and gas distributor.On the one hand, one novel large-diameter gas distributor with a larger flux wasintroduced to address the gas maldistribution problems in the process of CO2absorption. Besides, various structural parameters based on the original type wereinvestigated for optimization by used of CFD method, which included the counts ofgas-inlet pipe, as well as the length, deflection and diameter. Meanwhile, the baffleswere also taken into account for optimization. According to the simulation results, theinitial gas unevenness has been improved after optimization, and the gasmal-distribution factors were lower than traditional Sulzer gas distributor. Moreover,these optimized structures presented lower pressure drop and more flux.On the another hand, a novel structured packing with diversion windows wasdeveloped with the objective of achieving comparable pressure drop, high capacityand preferable mass transfer efficiency. The hydrodynamics performances have beeninvestigated using a384mm diameter column. On basis of the experimental data, it isconcluded that the novel structured packing250X and250Y with adding diversionwindows can change the flow pattern of the liquid film on the packing sheet andincrease the effective mass transfer area, as well as the gas-liquid mass transferefficiency. |
PDF Full Text Request