Based on the volume average method, gas-liquid two-phase flow CFD model is established to describe the random packing column in seawater desulfurization. The fluid velocity and porosity distribution were obtained by calculation. Based on the experimental research with three different filler, the dry and wet loss curves which describes gas flow with in each packed bed are obtained, calculations results of pressure loss and experimental results are well consistent. Analyzing the seawater velocity vector in packed columns and velocity profile of the section on the middle of the packed tower, a significant “wall flow” phenomena was found. There is an accumulation trend near the wall along the direction of the liquid flow, and the wall flow becomes much more serious. As can be seen from the chart that the porosity distribution on the radial direction near the wall is significantly higher than it is at the middle area, which is the reason for the formation of wall flow.
The research aimed to investigate the ecotoxicity of nano Ni(OH)2 from the leakage of lithium battery leakage on Carassius auratus. Choosing Carassius auratus as test biology, Researched on Content of free radical in the liver, SOD, GST and GSH. The main findings are as follows: As proved by EPR spinning trapping, nano Ni(OH)2 may induce the generation of hydroxyl radical in the body of Carassius auratus, which may impose significant impact on such active oxygen scavenging systems as SOD, GST and GSH. Nano Ni(OH)2 as concentrated in the fish body may incur redox reaction, and produce redox metabolic intermediate. The study provides the theoretical basis for safety problems might be incurred by mutual action between nano-material and organisms. As one of important toxic mechanisms of nano Ni(OH)2 to Carassius auratus, oxidative stress mechanism requires further study.
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