Combining improved injector, gas line and valve-driving models, a gas chromatograph (GC) equipped with Hydrogen Flame Ionization Detector (FID) and Electron Capture Detector (ECD), can measure CH4, CO2, and N2O simult...Combining improved injector, gas line and valve-driving models, a gas chromatograph (GC) equipped with Hydrogen Flame Ionization Detector (FID) and Electron Capture Detector (ECD), can measure CH4, CO2, and N2O simultaneously in an air sample in four minutes. Test results show that the system has high sensitivity, resolution, and precision; the linear response range of the system meets the requirement of flux measurements in situ. The system is suitable for monitoring fluxes of the main greenhouse gases in a short-plant field since it is easy to use, efficacious, and constant and reliable in collecting data.展开更多
二氧化碳捕集和封存(carbon capture and storage,CCS)是实现电力低碳化发展的关键技术,具有光明的发展前景。作为未来重要的电源选择,碳捕集电厂的运行性能与调整能力将对电网运行的安全性与高效性产生重大影响。结合碳捕集技术的基本...二氧化碳捕集和封存(carbon capture and storage,CCS)是实现电力低碳化发展的关键技术,具有光明的发展前景。作为未来重要的电源选择,碳捕集电厂的运行性能与调整能力将对电网运行的安全性与高效性产生重大影响。结合碳捕集技术的基本原理,深入研究了碳捕集电厂内部的能量流,量化分析了碳捕集电厂的运行区间,并揭示了碳捕集电厂的调峰性能。在此基础上,提出基于"电力系统调峰成本曲线"的分析方法,以直观、简明的方式实现了电力系统的调峰优化决策;并以具有复杂电源结构的电力系统为例进行调峰效果分析,特别测算了碳捕集电厂对电力系统容纳大规模风电接入的贡献率,评估了碳捕集电厂在提高电网运行安全裕度与降低系统调峰成本上的显著效益。展开更多
Using a dark enclosed chamber technique, the fluxes of CO2, N2O and CH4 from nature and disturbed grassland were measured on the spot in Inner Mongolian Temperate Grassland along the annual rainfall gradient section r...Using a dark enclosed chamber technique, the fluxes of CO2, N2O and CH4 from nature and disturbed grassland were measured on the spot in Inner Mongolian Temperate Grassland along the annual rainfall gradient section ranging from 450 to 200 mm. The results showed that the measured mean fluxes of CO2, N2O and CH4were (1 180.4 ±308.7), (0.010 ± 0.004) and (-0.039 ± 0.016) mg · m-2/h, respectively. The decrease of the fluxes of CO2, N2O and CH4 follows with that of annual rainfall gradient in the measurement area. Human activities, such as grazing and reclamation are also critical factors to affect the fluxes of these gases from grassland. Daily continuous measurement of CO2, N2O and CH4 fluxes showed a strong diurnal variation with higher emission in the daytime. A good relationship between the fluxes of CO2, N2O, CH4 and temperature was exposed in this study.展开更多
文摘Combining improved injector, gas line and valve-driving models, a gas chromatograph (GC) equipped with Hydrogen Flame Ionization Detector (FID) and Electron Capture Detector (ECD), can measure CH4, CO2, and N2O simultaneously in an air sample in four minutes. Test results show that the system has high sensitivity, resolution, and precision; the linear response range of the system meets the requirement of flux measurements in situ. The system is suitable for monitoring fluxes of the main greenhouse gases in a short-plant field since it is easy to use, efficacious, and constant and reliable in collecting data.
文摘二氧化碳捕集和封存(carbon capture and storage,CCS)是实现电力低碳化发展的关键技术,具有光明的发展前景。作为未来重要的电源选择,碳捕集电厂的运行性能与调整能力将对电网运行的安全性与高效性产生重大影响。结合碳捕集技术的基本原理,深入研究了碳捕集电厂内部的能量流,量化分析了碳捕集电厂的运行区间,并揭示了碳捕集电厂的调峰性能。在此基础上,提出基于"电力系统调峰成本曲线"的分析方法,以直观、简明的方式实现了电力系统的调峰优化决策;并以具有复杂电源结构的电力系统为例进行调峰效果分析,特别测算了碳捕集电厂对电力系统容纳大规模风电接入的贡献率,评估了碳捕集电厂在提高电网运行安全裕度与降低系统调峰成本上的显著效益。
文摘Using a dark enclosed chamber technique, the fluxes of CO2, N2O and CH4 from nature and disturbed grassland were measured on the spot in Inner Mongolian Temperate Grassland along the annual rainfall gradient section ranging from 450 to 200 mm. The results showed that the measured mean fluxes of CO2, N2O and CH4were (1 180.4 ±308.7), (0.010 ± 0.004) and (-0.039 ± 0.016) mg · m-2/h, respectively. The decrease of the fluxes of CO2, N2O and CH4 follows with that of annual rainfall gradient in the measurement area. Human activities, such as grazing and reclamation are also critical factors to affect the fluxes of these gases from grassland. Daily continuous measurement of CO2, N2O and CH4 fluxes showed a strong diurnal variation with higher emission in the daytime. A good relationship between the fluxes of CO2, N2O, CH4 and temperature was exposed in this study.
