新型湿式湍流除尘器及在电厂输煤系统中的应用

介绍了针对火电厂输煤系统作业环境粉尘治理而研制开发的新型湿式湍流除尘器的设计思路、设备结构、技术特点及在电厂输煤系统的应用情况.     

Effective method of predicting confined pressure behavior under isotropic turbulence

Explosion pressure prediction is indispensable to ensure process safety against accidental gas explosions. This work is aimed at establishing a theoretical method for predicting confined methane-air explosion pressure under isotropic turbulence. The results indicated that the pressure rise rate becomes significantly increased by the existence of isotropic turbulence, which effect on peak value of explosion pressure is negligible. Among various models of turbulent burning velocity, the calculated pressure rise rate using Chiu model, Williams model and Liu model is relatively closer to experimental value. With the increase of turbulent integral length and RMS turbulent fluctuation velocity, the pressure rise rate becomes increased continuously. The influence of adiabatic compression and isothermal compression on pressure rise rate could be ignored. To predict explosion pressure in a more accurate way, the dynamic variation of turbulent integral length and RMS turbulent fluctuation velocity should be considered in the future.     

光照与通气方式对蓝、绿藻竞争生长和磷的水-沉积物界面过程的影响

室内模拟研究了太湖普遍存在的浮游藻类蓝藻(铜绿微囊藻)和绿藻(四尾栅藻)在不同光照和通气条件下的生长过程,以及该过程对水体理化性质以及水-沉积物界面磷交换过程的影响.研究结果表明,实验条件下(光照:2500lx;温度:27℃),蓝藻(铜绿微囊藻)具有绝对的竞争优势,成为水体中优势藻类.铜绿微囊藻在通空气和通氮气条件下均可以生长繁殖,在通氮气条件下需要较长时间的适应期,但达到的最大生物量远高于通空气条件.实验过程中,上覆水可溶性无机磷(DIP)浓度的变化为:无光环境＞有光环境,通氮气环境＞通空气环境,这种变化与有无藻类生长过程密切有关.有光条件下,藻类生长对磷的需求刺激了沉积物中生物可利用磷(AAP)的释放,同时也刺激了沉积物各种不同形态磷之间的相互转化.通氮气条件下,沉积物中磷的释放以Fe-P为主,Ca-P含量有所提高;通空气条件,Fe-P含量变化不大,Ca-P在有光组略有下降,但无光组变化不大;各试验组中有机磷和残渣磷的变化量基本相同;各试验组TP含量的变化不大.     

湿法烟气脱硫除雾器设计选型和维护

分析了除雾器叶片的设计要求，比较了平板型和屋脊型除雾器的特点。从运行、维护的角度出发，建议建立除雾器检测和冲洗制度，以确保除雾器的安全、正常运行。     

ESP粉尘二维输运方程中紊流掺混系数及边界条件的确定

求解电除尘器ESP(Electrostatic Precipitator)电场粉尘输运方程中粉尘浓度分布时,确定紊流掺混系数及边界条件至关重要.根据紊流传质原理,推导出紊流掺混系数; 通过雷诺数将电风影响引入紊流掺混系数,推导出紊流掺混系数随电晕线到极板距离的增大而增大.极板附近存在具有一定厚度的层流边层.分析层流边层中荷电粒子迁移输运行为,得到极板处粉尘浓度变化规律,这可作为求解输运方程时极板处的边界条件.用Matlab程序求解输运方程.经验证,理论计算的数值结果与试验结果一致,这表明本文所推导的紊流掺混系数和边界条件是正确的.本文使ESP收尘过程的理论研究更加深入,对提高ESP的收尘效率也具有重要意义.     

湍球塔和喷淋塔的海水脱硫冷态实验对比

通过湍球塔和喷淋塔的海水脱硫冷态实验对比,研究海水脱硫过程中烟气和海水参数对湍球塔和喷淋塔脱硫的不同影响。实验结果表明,SO2分压力增大,脱硫效率和尾水pH值减小;海水碱度、pH值和液气比增大,脱硫效率和尾水pH值也随之增大;湍球塔的脱硫效率和尾水pH值与液气比改变方式无关,实验用湍球塔的合适液气比值为2.3 L/m3;湍球塔脱硫实验中,塔内气速为1.58 m/s,SO2分压力为20 Pa,水温为10.2℃,液气比为1.1~2.8 L/m3时,尾水pH值在2.4~2.8之间;增大液气比时,喷淋塔改变海水流量的脱硫效果要比改变气体流量的脱硫效果明显;塔内气速1 m/s以上时,一级喷淋塔的脱硫效率要比湍球塔小很多,有时只有湍球塔的1/2左右。     

Modeling the binding of triazine herbicides to humic substances using capillary electrophoresis

The binding of 4 s-triazines herbicides and metabolites, ameline, hydroxyatrazine, atraton, and ametryn to 12 structurally different humic substances was studied by affinity capillary electrophoresis. Binding data were confronted to the structural data of humic acids obtained from spectrometric measurements (UV-Vis, FT/IR, NMR), elemental analysis and potentiometric titration. The results obtained with principal component analysis and partial least square analysis clearly show the importance of carboxylic acidity and aromaticity of the humic ligands in relation to the partial positive charge and relative hydrophobicity of the pesticides.     

高速涡流镁粉机组粉尘爆炸危险性评估

阐述了高速涡流镁粉机组的生产工艺流程及其构造、分析表明，在正常生产情况下不会发生粉尘爆炸事故。