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工作场所中二氧化硫的测定方法研究 被引量:4
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作者 熊杏茹 《中国校医》 2015年第10期790-791,共2页
目的基于铬酸钡原子吸收法测定硫酸盐原理,探索出一套采用火焰原子吸收光谱法间接测定工作场所中二氧化硫浓度的方法。方法用高氯酸溶液收集空气中的二氧化硫,将空气中的亚硫酸根被氧化成硫酸根,用铬酸钡悬浊液使之生成硫酸钡沉淀,用火... 目的基于铬酸钡原子吸收法测定硫酸盐原理,探索出一套采用火焰原子吸收光谱法间接测定工作场所中二氧化硫浓度的方法。方法用高氯酸溶液收集空气中的二氧化硫,将空气中的亚硫酸根被氧化成硫酸根,用铬酸钡悬浊液使之生成硫酸钡沉淀,用火焰原子吸收光谱法吸收释放的铬酸根,间接求出二氧化硫含量,从而求得采集样品中二氧化硫浓度。结果工作标准曲线关系数为0.9992,检出限值为0.12μg/m L,加标回收率在95.0%~106.0%之间。结论采用火焰原子吸收光谱法测定工作场所中的二氧化硫,操作方法简单,检出限值较小,结果可靠。 展开更多
关键词 二氧化硫/分析 分光光度法 原子/方法
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The Chemical Principle of Green Coal Power 被引量:1
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作者 Li Zhou 《Journal of Energy and Power Engineering》 2014年第11期1918-1925,共8页
Coal is still a major source of energy, also a major source of SO_2, NOx and CO_2 emission though. Removal of SO_2 and NOx doubled the cost of power generation, and capture of CO_2 is equivalent to double the market p... Coal is still a major source of energy, also a major source of SO_2, NOx and CO_2 emission though. Removal of SO_2 and NOx doubled the cost of power generation, and capture of CO_2 is equivalent to double the market price of power coal. The GCP (green coal power) is the power generated in coal-combustion with zero emission. The author indicates that it is possible to make coal-fired power plants emission free based on thermodynamic analysis and purposely designed experiments using SFG (simulated flue gases). It is concluded in the study that all SO_2 and NOx in the post-combustion flue gas are reduced to inoffensive substances at temperature lower than 750 ℃ when contacting carbon and elemental sulfur is separated in succeeded cooling of flue gas at temperatures 200-400 ℃, and the ultrafine dusts are trapped in condensed water at temperature blow 100 ℃. Based on chemical engineering expertise the author is sure that the cost for removing acid gases is much lower than any clean coal technologies known to today. Instead of capture, the remained CO_2 is converted to CO in the second time contact with carbon at 900-950 ℃. CO is the raw material of chemical synthesis and, thus, CO_2 is stored in chemical products such as methanol, fertilizer, plastics, etc. The simple and low-cost processing allows GCP utilized in practice easily. 展开更多
关键词 Chemical principle green coal power clean coal technology C0_2 emission carbon reduction.
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Sulfur poisoning mechanism of three way catalytic converter and its grey relational analysis
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作者 蔡皓 刘亚飞 +3 位作者 龚金科 鄂加强 耿玉鹤 余立平 《Journal of Central South University》 SCIE EI CAS 2014年第11期4091-4096,共6页
Combining a detailed catalytic surface reaction mechanism with noble metal and promoter elementary reactions, a new three-way catalytic converter(TWC) reaction mechanism is established. Based on the new mechanism, ste... Combining a detailed catalytic surface reaction mechanism with noble metal and promoter elementary reactions, a new three-way catalytic converter(TWC) reaction mechanism is established. Based on the new mechanism, steady condition numerical simulation is carried out, and the change of light-off temperatures and conversion efficiency with various SO2 contents is obtained. By grey relational analysis(GRA), the relational grade between conversion efficiency and SO2 content is obtained. And, the result shows that SO2 content has the most important influence on C3H6 and NOX conversion efficiency. This provides an important reference to the improvement of activity design of TWC, and may provide guidance for the condition design and optimization of TWC. 展开更多
关键词 sulfur poisoning three-way catalytic converter reaction mechanism numerical simulation grey relational analysis
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