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2017年春季辽宁省秸秆焚烧火点遥感监测分析 被引量:3
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作者 邰姗姗 张峻玮 白璐 《环境保护与循环经济》 2019年第3期75-77,共3页
简述了常用于监测秸秆焚烧火点的遥感数据源和监测原理,采用MODIS和VIIRS 2种数据对2017年辽宁省春季秸秆焚烧火点进行监测分析。结果表明,沈阳监测到的火点数量最多,占全省总数的28.0%,本溪最少;采用VIIRS数据监测到的火点数明显多于MO... 简述了常用于监测秸秆焚烧火点的遥感数据源和监测原理,采用MODIS和VIIRS 2种数据对2017年辽宁省春季秸秆焚烧火点进行监测分析。结果表明,沈阳监测到的火点数量最多,占全省总数的28.0%,本溪最少;采用VIIRS数据监测到的火点数明显多于MODIS数据的监测结果。 展开更多
关键词 秸秆焚烧 遥感监测 数据源 时空分辨率 火点分析
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Effects of Promoters on the Ignition Process over NiO/Al_2O_3 Catalyst for Autothermal Reforming of Methane to Hydrogen 被引量:1
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作者 Cai Xiulan Li Guangyan Lin Weiming 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS 2014年第3期56-62,共7页
The catalysts Ni/Al2O3, Ni/ZrO2-CeO2-Al2O3 and Ni/CuO-ZrO2-CeO2-Al2O3 were prepared by the co-precipitation method at a pH of 9 using Na2CO3 as the precipitant. The Ni loading(mass fraction) of the catalysts was 10%. ... The catalysts Ni/Al2O3, Ni/ZrO2-CeO2-Al2O3 and Ni/CuO-ZrO2-CeO2-Al2O3 were prepared by the co-precipitation method at a pH of 9 using Na2CO3 as the precipitant. The Ni loading(mass fraction) of the catalysts was 10%. The ignition process on the catalysts for the autothermal reforming of methane to hydrogen was investigated and the surface properties of the catalysts were characterized by XPS. The results showed that the Ni/Al2O3 catalyst could not ignite the process of autothermal reforming of methane to hydrogen. However, the Ni/CuO-ZrO2-CeO2-Al2O3 catalyst could ignite the process of autothermal reforming of methane to hydrogen at lower reaction temperature(650 ℃) with the conversion of methane reaching 76%. The result of XPS analysis indicated that the promoters could change the binding energy(BE) of Ni2p3/2 obviously. The species of Cu in the Ni/CuO-ZrO2-CeO2-Al2O3 catalyst comprised Cu2 O and Cu2+. The formation of ZrO2-CeO2 solid solution and a large amount of Cu2 O might be the reason leading to good oxygen storage capacity and mobility of lattice oxygen of the Ni/CuO-ZrO2-CeO2-Al2O3 catalyst, which could ignite the process of autothermal reforming of methane to hydrogen at lower reaction temperature. 展开更多
关键词 METHANE autothermal reforming hydrogen production ignition process
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Sensitivity and effect of key operational parameters on performance of a dual-cylinder free-piston engine generator 被引量:1
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作者 ZHANG Zhi-yuan FENG Hui-hua +1 位作者 JIA Bo-ru ZUO Zheng-xing 《Journal of Central South University》 SCIE EI CAS CSCD 2022年第7期2101-2111,共11页
The free-piston engine generator(FPEG)is regarded as the next generation of energy conversion system which may replace traditional engines in the future.The effect of key operational parameters like excess air ratio o... The free-piston engine generator(FPEG)is regarded as the next generation of energy conversion system which may replace traditional engines in the future.The effect of key operational parameters like excess air ratio of input mixture and ignition position on the engine performance of a dual-cylinder FPEG was investigated,and their sensitivity was analyzed in this paper.The operating compression ratio of the system is susceptible to changes in excess air ratio and ignition position.At the same time,it decreases from 15.8 to 6.6 when excess air ratio increases from 0.85 to 1.15,but it increases from 6.1 to 13.3 as ignition position increases from 15 mm to 20 mm.The operating frequency and indicated power are more sensitive to changes in excess air ratio than ignition position.But it is the opposite for the indicated thermal efficiency and friction loss.Excess air ratio and ignition position have a quite similar influence on heat transfer.Therefore,from the perspective of system operation and performance,it is preferable to keep excess air coefficient slightly below 1.0.In contrast,when selecting ignition position,it is of great importance to comprehensively consider the risk of structural damage caused by the increase in the compression ratio and in-cylinder gas pressure. 展开更多
关键词 free piston engine generator excess air ratio ignition position operation characteristics sensitivity analysis thermal efficiency
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