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Study on temperature characteristics of gasoline engine particulate filters during fuel cut-off
Nan Li,Zheng Nan,Qiushi Zhang,Haitao Liu,Lun Hua,Caihong Zhang 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.12
Based on the bench test of a 1.5 L gasoline engine equipped with a catalytic gasoline engine particulate filter(CGPF), the fuel cut-off regeneration characteristics of the next generation with small pore size GPF and the commonGPF under different soot loading and temperatures were studied. The results showed that after the fuel was cutoffduring the regeneration process, the center temperature of the sample rose exponentially, and as the regenerationtime extended, the temperature gradually became flat. The temperature distribution inside the carrier was such that theinlet temperature was low at the axial position, and the temperature near the outlet was high, the radial position showeda trend of high temperature in the middle and low temperature at the edge, and the temperature difference betweenthe edge and the center of the carrier was large. The maximum temperature inside the GPF increased with the increasein soot loading, and the maximum temperature gradient also increased. When the soot loading reached 6 g/L and thefuel cut-off regeneration was conducted at 650 oC, the maximum and maximum temperature gradient inside the GPFexceeded the tolerance limit of the GPF, and the inside of the carrier was damaged to varying degrees. Therefore, theseparameters should be controlled during regeneration.
Highly selective separation of vanadium over iron from stone coal by oxalic acid leaching
Pengcheng Hu,Yimin Zhang,Tao Liu,Jing Huang,Yizhong Yuan,Qiushi Zheng 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.45 No.-
In this paper, a novel method was proposed to selectively extract vanadium from stone coal by oxalicacid leaching. Vanadium was leached, but the iron impurity wasmaintained in the leaching residue. Theeffects of leaching conditions on the leaching efficiency of vanadium and iron were investigated foroxalic and sulfuric acid leaching, respectively. For oxalic acid leaching, 71.5% of the vanadium can berecovered with only 3.4% of the iron impurity leached under the leaching conditions: a dosage of H+ of12 mol/kg, a leaching time of 6 h, a leaching temperature of 368 K (95 8C) and a water–mineral ratio of1.5 L/kg. However, under the same conditions, 74.1% of the vanadium and 13% of the iron were leachedduring sulfuric acid leaching. The XRD and FTIR analyses showed that both oxalic and sulfuric acidleaching can destroy the crystal lattice structure of muscovite, resulting in the leaching efficiency ofvanadium without much difference. Further, the SEM-EDS and XPS analyses indicated that very littlepyrite dissolved during oxalic acid leaching, but that much more pyrite dissolved during sulfuric acidleaching. Therefore, oxalic acid leaching can achieve a highly selective separation of vanadium over ironfrom stone coal.