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渐扩切向槽角度对低压燃油雾化喷嘴流动特性影响的数值研究 被引量:8
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作者 冉景煜 张力 +1 位作者 蒲舸 辛明道 《中国电机工程学报》 EI CSCD 北大核心 2006年第1期45-50,共6页
油枪点火与助燃在燃煤锅炉上应用较为普遍。但在应用中油喷嘴雾化所需的压力较高(2.0-2.5MPa),耗油量较大,使整个油系统的维护工作量增大。并影响运行的经济性。为减小运行压力,文中提出有渐扩切向槽式旋流雾化油喷嘴,建立了有... 油枪点火与助燃在燃煤锅炉上应用较为普遍。但在应用中油喷嘴雾化所需的压力较高(2.0-2.5MPa),耗油量较大,使整个油系统的维护工作量增大。并影响运行的经济性。为减小运行压力,文中提出有渐扩切向槽式旋流雾化油喷嘴,建立了有渐扩切向槽旋流雾化喷嘴的三维流动数学模型,采用k-ε/RNG模型和SIMPLE方法数值模拟了有渐扩切向槽偏转角的低压燃油喷嘴的流动特性,并对不同渐扩切向槽角度θ时的喷嘴流动特性进行了比较,结果表明:渐扩切向槽的偏转角目大小对其流动特性影响较大,偏转角环能为负值,因其能量损失较大;当渐扩角度θ=6°时,其能量损失最小,喷嘴内轻柴油流动刚好形成实心的锥体,喷嘴回流刚好消失,此后,随着鳓增加,能量损失也增加;切向槽只要存在渐扩角度,其能量损失均小于无渐扩(缩)角度的情况,切向槽外扩角度(正值)的能量损失小于切向槽内扩角度。 展开更多
关键词 低压 燃油雾化喷嘴 流动特性 数值研究 渐扩切向槽 锅炉
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Regeneration and reuse of anode graphite from spent lithium-ion batteries with low greenhouse gas (GHG) emissions 被引量:1
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作者 Junjie Liu Hui Shi +5 位作者 Ke Yu Yanni Geng Xingyu Hu Genping Yi Jianzhi Zhang Xubiao Luo 《Chinese Chemical Letters》 SCIE CAS CSCD 2023年第10期111-115,共5页
Regenerating spent graphite(SG)from retired lithium-ion batteries(LIBs)can effectively avoid resource waste.However,the technology is challenged by the impurity content and energy consumption.In this study,micro-expan... Regenerating spent graphite(SG)from retired lithium-ion batteries(LIBs)can effectively avoid resource waste.However,the technology is challenged by the impurity content and energy consumption.In this study,micro-expanded graphite(MEG)was synthesized by one-step oxidation method using waste LIBs anode graphite as material and perchloric acid as intercalation and oxidant agent.Then,its performance as a LIBs anode material were investigated as well as the greenhouse gas(GHG)emissions of the whole process were calculated.Perchloric acid was successfully embedded in the SG during the reaction,which effectively removed the impurities in the graphite.Defects introduced during intercalation and delamination,such as nanopores and intercrystalline cracks.Both provide additional space for Li ions during charging and discharging,thereby promoting capacity enhancement.The prepared MEG expresses a rate capability as high as 340.32 m Ah/g at a current density of 0.1 C and still retains 81.73%of the capacity after 100 cycles at a current density of 1 C.Additionally,the GHG emissions of the synthesis process of this article and other literatures are compared.The results demonstrated that perchloric acid treatment process provides a low-carbon,time-and energy-saving approach for regenerated SG as battery grade material. 展开更多
关键词 Spent graphite Retired lithium-ion batteries Greenhouse gas emissions Regenerated Perchloric acid micro-expanded graphite
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