The Development of a High Resolution ESI-QTOFMS Coupled with Three Sect Quadrupoles

报道了实验室研制的电喷雾离子源 ,具有射频四极杆接口的高分辨飞行时间质谱 (ESI- QQQ- TOFMS)仪器。该仪器具有以下特点 :在离子调制区使用三组四极杆 ,有效地减少离子束的空间分散和能量分散 ;采用正负双脉冲推斥和离子垂直引入方式 ;经过优化设计的二级有网反射器 ;新颖的 MCP安装方法。经初步调试 ,该仪器的分辨本领已优于 1 0 ,0 0 0 ,质量测定精度优于 1 0× 1 0 - 6 。该仪器于 2 0 0 2年 6月通过了国家教育部科技成果鉴定 [鉴字 [教 2 0 0 2 ]第 0 0 8号 ],其主要性能指标已经达到了国际先进水平An high resolution ESI QQQ TOFMS coupled with three sect quadrupoles is reported.The home made instrument in the laboratory has a number of features. It can be used as tandem MS (MS/MS) owing to three sect quadrupoles used in the ion modulation part; the TOFMS analyzer adopted positive negative double extrusion pulse and orthogonal injection way; two grade ion reflector with grids designed by computer simulation, and new micro channel plate (MCP) mounting method. This instrument has already been in working condition after preliminary adjustment, and the resolution over 10,000 was achieved.国家自然科学基金资助项目 (专项 H-2 992 70 0 2和重点 2 92 45 110 ) ;; 教育部现代分析科学重点实验室开放课

Modeling NO and SO2 Oxidation by H2O2 in Coal-Fired Flue Gas

NO and SO2 oxidization by H2O2 in coal-fired flue gas was modeled, and the effects of temperature and H2O2 concentration on NO and SO2 oxidization were investigated. The pathways of NO and SO2 oxidization were as follows: H2O2OHHO2+NONO2 and SO2+OHHOSO2+O2SO3, respectively. There were optimal temperature ranges of NO and SO2 oxidization, and the ranges were 650-920K and 650-750K, respectively. In the optimal temperature ranges, the NO2 conversion rate was greater than 0.9 at MRH2O2/NO>1.9, and the SO3 conversion rate reached about 0.3 at MRH2O2/SO2=0.1-0.4. SO2 oxidization could promote HO2 formation to oxidize NO

利用相空间重构方法分析层流扩散火焰燃烧不稳定现象

本文利用相空间重构方法获得层流火焰燃烧不稳定的临界参数。利用光电倍增管捕获火焰发光强度随时间的变化信号,经相空间重构后获得三维相空间下的重构曲线。在不同的燃烧状态下,光强度重构曲线呈现出不同的特征,可用来区分燃烧状态。本文针对0.2～4.0 MPa下的甲烷/纯氧层流同轴扩散火焰光强信号进行相空间重构,获得了不同条件下燃烧稳定性的临界参数。并对火焰稳定燃烧、间歇震荡、持续震荡三种状态临界参数进行曲线拟合

Experiment on NOx reduction by advanced reburning in cement precalciner

Experiment on NOx reduction by advanced reburning in cement precalciner was performed on a laboratory-scale circulating fluidized bed reactor. In reburning zone, the order of the adsorption ability on CaO surface is CO2 &gt; NO &gt; CO, CO2 occupies a large fraction of the active sites to inhibits NO reduction by CO, the decrement of NO reduction rate is about 35% when CO2 increases from 15% to 30%, and the increment of NO reduction rate is about 40% when temperature increases from 850 degrees C to 1050 degrees C. In SNCR zone, CO2 concentration has an optimal range (25-27%) due to the competitive adsorption of CO2 and NH3 and the formation of (NH2)(2)CO on CaO surface, the optimal temperature range becomes narrow (850-975 degrees C) in comparison with that in utility boiler, the optimal concentration of O-2 is in the range of 2% to 3.3%, and NO reduction rate reaches above 75% at 900-970 degrees C.</p