啮合同向双螺杆挤出机的相似放大

首先给出啮合同向双螺杆挤出机熔体输送段相似放大方法中所用到的参量表达式,然后从混合、热平衡和综合这两方面分别进行相似放大,并分析各自的优缺点。利用W＆P公司ZSK系列混合机的设计特点和技术数据,分析了相似放大设计在实际中的应用。对大型同向双螺杆挤出机提出相似放大的准则,应是螺杆线速度保持恒定。     

对氰基氯苄中试制备工艺的研究

研究了对氰基甲苯用光氯化法制备对氰基氯苄的中试工艺。把160 kg的对氰基甲苯投入到300 L的搪瓷反应釜中,把3只100 W白炽灯的光照引入到对氰基甲苯液体中,在150~155℃下以8~9.5 kg/h速度通入干燥的氯气,通入氯气的量约38 kg停止反应,冷却氯化液,用离心机分离析出的晶体,母液再投入到反应釜中,重复上述操作,通氯气量分别为17、127、kg,把所得的对氰基氯苄合并,用乙醇重结晶,干燥,共得到产物161.5 kg,总收率78.5%,含量99.5%。     

Effect of electrode geometry and charge on the production of polymer microbeads by electrostatics

Experimental parameters which are critical for producing small diameter (i.e. 100-300 μm) polymer microbeads, using electrostatic droplet generation, were investigated with three types of electrodes; a parallel plate, a positively charged needle and a grounded needle with alginate as the polymer. Electrode spacing was a critical factor controlling microbead size, but only for the parallel plate set-up. While the applied potential affected droplet size in all three set-ups, the smallest droplet size was produced with the positively charged needle. In some experiments needle oscillation was observed resulting in even smaller microbeads (i.e. < 100 μm). Calculated microbead diameters agreed well with experimental values.     

搅拌槽中固液悬浮及其放大的研究

研究了具有盘管、碟形底和斜叶涡轮固液悬浮搅拌槽的放大规律。试验用槽径（外径）分别为０．２ｍ、０．５ｍ和１．０ｍ的三个有机玻璃搅拌槽。用激光法测定悬浮液浓度。得出离底悬浮及均匀悬浮时搅拌转速和比功率的经验关联式，与测定槽内轴向速度分布所导出的均匀悬浮方程相吻合，并表明槽径的放大指数主要由循环流数所决定。     

Scale-Up Study on the Performance of Annular Pulsed Disc-and-Doughnut Columns

Based on the previous work of the hydraulic, axial mixing, and mass-transfer performance of an annular pulsed disc-and-doughnut column (APDDC), the effects of scaling-up on its performance were studied in APDDCs with different annular space widths. The effect of scaling-up on holdup was discussed, and a more universal correlation was established. The effect of scaling-up on the Sauter drop diameter could be expressed by the previous obtained correlation. The effects of scaling-up on both the flooding holdup and throughput were mainly reflected in the correlation of the Sauter drop diameter. The equations of operating regimes were also independent of the scaling-up effect as demonstrated by experimental data. The scaling-up effects on the axial-dispersion coefficient of the continuous phase, the mass-transfer coefficient, and the height of a transfer unit were also discussed.     

不同电极结构等离子体反应器的放大试验研究

应用脉冲放电等离子体技术,在三种不同电极结构的线板式反应器内对模拟甲苯废气的净化进行了放大试验.三种反应器是A-无阻挡式、B-陶瓷板阻挡式和C-陶瓷板阻挡并负载MnOx催化剂式.采用一种基于闸流管开关、Blumlein脉冲形成网络和脉冲变压器技术的高压脉冲电源,其最大输出功率为1kW,最大脉冲电压峰值为100kV.试验结果表明: 当甲苯的初始质量浓度为5.4g/m3、处理气量为4m3/h、峰值电压为67kV、重复频率为300Hz时,反应器A的甲苯去除率为47%,B为64%,C可达80%;当能量密度相同时,C的甲苯能量利用率最高,B次之,A最低;陶瓷板的阻挡有效地降低了反应器放电产生的臭氧质量浓度;当峰值电压相同时,陶瓷板的阻挡有利于提高次峰电压、峰值电流、峰值功率、单脉冲能量及其注入反应器的平均功率;MnOx催化剂的存在可强化放电等离子体去除甲苯的过程.     

工业聚合反应装置：Ⅳ.乳液聚合反应器（下）

讨论了釜式乳液聚合反应器搅拌桨的选择原则及其搅拌特性和乳液聚合反应器的放大准则，聚合过程的控制及其优化。     

Flow patterns in a pilot plant-scale turbulent fluidized bed reactor: Concurrent application of tracers and fiber optic sensors

Hydrodynamics of a turbulent fluidized bed is studied by means of the concurrent application of fiber optic sensors and a helium tracer. It is observed that in the vicinity of the column wall there is a high bubble activity region. Low bubble activity and negative bubble velocities are reported for the dense phase near the column centre-line region. A temperature increase from 22 to 145°C results in a more homogeneous turbulent fluidized bed with smaller bubbles and more gas flowing through an expanded dense bed emulsion phase. Mass transfer coefficients between bubble-emulsion (k_be) and bubble-annulus (k_ba) are evaluated. The dominant mass transfer path was the one from the bubbles to the annular region with k_ba being several times greater than k_be.     

利用世行贷款 推动小水电发展

浙江省顺利完成了中国可再生能源规模化发展项目试点——浙江小水电世行贷款项目。文章回顾了浙江小水电世行贷款项目的实施情况,总结了实施该项目的主要做法及管理模式,并提出了试点项目的有关建议。