水泥生产中石灰石粉磨和烘干工序具有显著的SO 2吸收特性,其属于半干法脱硫。采用固定床实验装置,设计了石英砂作为空白对照,研究了反应温度、石灰石含水率对石灰石低温半干法固硫的影响。结果表明,当石灰石含水率为20%,反应温度从50℃...水泥生产中石灰石粉磨和烘干工序具有显著的SO 2吸收特性,其属于半干法脱硫。采用固定床实验装置,设计了石英砂作为空白对照,研究了反应温度、石灰石含水率对石灰石低温半干法固硫的影响。结果表明,当石灰石含水率为20%,反应温度从50℃升高到100℃时,石灰石对SO 2的吸附量从1.06 mg SO 2/g石灰石下降至0.32 mg SO 2/g石灰石,随温度升高而降低;其中SO 2物理吸附比例从4.72%最高增加至17.81%,随温度升高而增大。当含水率为5%、10%和20%时,在50~100℃内石灰石颗粒对SO 2的平均吸附量分别为0.14 mg SO 2/g、0.25 mg SO 2/g和0.60 mg SO 2/g石灰石,其中SO 2物理吸附比例分别为38.60%、17.66%和11.22%;SO 2吸附量随含水率增加而显著增大,而物理吸附比例随含水率增加而显著降低。采用积分计算的石灰石SO 3含量增加值与荧光分析结果相吻合,而与硫酸钡重量法检测结果不一致,表明石灰石低温半干法固硫产物以亚硫酸盐、亚硫酸氢盐等为主,而不是硫酸盐。展开更多
Lolines are a group of saturated pyrrolizidine alkaloids that possess broad bioactivity against a wide array of herbivorous insects. However, they do not exhibit toxicity to ruminants such as cattle and sheep. In orde...Lolines are a group of saturated pyrrolizidine alkaloids that possess broad bioactivity against a wide array of herbivorous insects. However, they do not exhibit toxicity to ruminants such as cattle and sheep. In order to study the direct and potential physiological effects on ruminants and the mechanism of insecticide/insectifuge, the distribution of loline alkaloids in endophyte-infected meadow fescue and the seasonal change of the distribution were analyzed. The crowns, roots and leaves of endophyte-infected meadow fescue at its four different growth periods, i.e., spring, summer, early autumn and late autumn, in New Zealand were colleted. After powdering, organic solvent extraction and purification by column chromatography, all loline alkaloid samples were analyzed by capillary gas chromatography with 4-phenylmorpholine （PM） as an internal standard. The analytic results showed that the loline contents in the roots, crowns and leaves of endophyte-infected meadow fescue vary with seasons. Even within the same season, the distribution of lolines in endophyte-infected meadow fescue varies. During summer, lolines mainly existed in the leaves and roots, but in early autumn, they are produced in the crowns. It was concluded that, lolines were mainly produced in the leaves and roots of endophyte-infected meadow fescue. In gas chromatographic analysis, N-formylloline, the major component of loline alkaloid in the plant, was employed to assay the alkaloids.展开更多
文摘水泥生产中石灰石粉磨和烘干工序具有显著的SO 2吸收特性,其属于半干法脱硫。采用固定床实验装置,设计了石英砂作为空白对照,研究了反应温度、石灰石含水率对石灰石低温半干法固硫的影响。结果表明,当石灰石含水率为20%,反应温度从50℃升高到100℃时,石灰石对SO 2的吸附量从1.06 mg SO 2/g石灰石下降至0.32 mg SO 2/g石灰石,随温度升高而降低;其中SO 2物理吸附比例从4.72%最高增加至17.81%,随温度升高而增大。当含水率为5%、10%和20%时,在50~100℃内石灰石颗粒对SO 2的平均吸附量分别为0.14 mg SO 2/g、0.25 mg SO 2/g和0.60 mg SO 2/g石灰石,其中SO 2物理吸附比例分别为38.60%、17.66%和11.22%;SO 2吸附量随含水率增加而显著增大,而物理吸附比例随含水率增加而显著降低。采用积分计算的石灰石SO 3含量增加值与荧光分析结果相吻合,而与硫酸钡重量法检测结果不一致,表明石灰石低温半干法固硫产物以亚硫酸盐、亚硫酸氢盐等为主,而不是硫酸盐。
基金the National Natural Science Foundation of China （30371067） Fok Ying Tung Education Foundation, China （91033） Foundation for Excellent Talents in Northwest A＆F University, China （11241）.
文摘Lolines are a group of saturated pyrrolizidine alkaloids that possess broad bioactivity against a wide array of herbivorous insects. However, they do not exhibit toxicity to ruminants such as cattle and sheep. In order to study the direct and potential physiological effects on ruminants and the mechanism of insecticide/insectifuge, the distribution of loline alkaloids in endophyte-infected meadow fescue and the seasonal change of the distribution were analyzed. The crowns, roots and leaves of endophyte-infected meadow fescue at its four different growth periods, i.e., spring, summer, early autumn and late autumn, in New Zealand were colleted. After powdering, organic solvent extraction and purification by column chromatography, all loline alkaloid samples were analyzed by capillary gas chromatography with 4-phenylmorpholine （PM） as an internal standard. The analytic results showed that the loline contents in the roots, crowns and leaves of endophyte-infected meadow fescue vary with seasons. Even within the same season, the distribution of lolines in endophyte-infected meadow fescue varies. During summer, lolines mainly existed in the leaves and roots, but in early autumn, they are produced in the crowns. It was concluded that, lolines were mainly produced in the leaves and roots of endophyte-infected meadow fescue. In gas chromatographic analysis, N-formylloline, the major component of loline alkaloid in the plant, was employed to assay the alkaloids.
