化工过程稳态模拟技术的现状和发展趋势

本文介绍了化工过程稳态模拟技术及其数学方法、计算环境和软件开发的现状和发展趋势。     

陶瓷部件挤出成型工艺

本文以蜂窝陶瓷生产工艺为例，讨论了陶瓷部件挤出成型过程中，塑性泥料的制备、成型、干燥和烧成等工艺技术和装备问题。     

运用数理统计方法提高循环水质量控制能力

介绍了对循环水质量控制的必要性和直方图法、过程能力计算等数理统计方法。绘制了直方图,并计算过程能力指数,对循环水质量控制水平作出评价。通过实际应用控制图,有效地提高循环水质量控制能力。     

Product and process parameters determination for quality and cost

The purpose of this study is to conduct a concurrent product and process parameters determination for further cost reduction and quality enhancement. The process design-related parameters, such as process mean, process tolerance and product design-related parameters, such as product tolerance, are considered simultaneously in the proposed approach. To reflect the response from these three key controllable characteristics: process mean, process tolerance and product tolerance, the key measurement score, which is the sum of the mean cost, tolerance cost, quality loss and failure cost, is used to evaluate the present model. Two examples are provided for demonstrating the application of single and multiple quality characteristics.     

A fuzzy neural network approach for online fault detection in waste water treatment process

In this paper, an effective strategy for fault detection of sludge volume index (SVI) sensor is proposed and tested on an experimental hardware setup in waste water treatment process (WWTP). The main objective of this fault detection strategy is to design a system which consists of the online sensors, the SVI predicting plant and fault diagnosis method. The SVI predicting plant is designed utilizing a fuzzy neural network (FNN), which is trained by a historical set of data collected during fault-free operation of WWTP. The fault diagnosis method, based on the difference between the measured concentration values and FNN predictions, allows a quick revealing of the faults. Then this proposed fault detection method is applied to a real WWTP and compared with other approaches. Experimental results show that the proposed fault detection strategy can obtain the fault signals of the SVI sensor online.     

Processing study of a high temperature adhesive

An adhesive-bonding process cycle study was performed for a polyimidesulphone. The high molecular weight, linear aromatic system possesses properties which make it attractive as a processable, low-cost material for elevated temperature applications. The results of a study to better understand the parameters that affect the adhesive properties of the polymer for titanium alloy adherends are presented. These include the tape preparation, the use of a primer and press and simulated autoclave processing conditions. The polymer was characterized using Fourier transform infrared spectroscopy, glass transition temperature determination, flow measurements, and weight loss measurements. The lap shear strength of the adhesive was used to evaluate the effects of the bonding process variations.     

悬浮法合成固体粒状丙烯酸树脂

研究了悬浮法合成固体丙烯酸树脂颗粒。讨论了不同软硬单体配比对丙烯酸树脂颗粒的玻璃化转变温度、相对分子质量及其分布的影响以及不同的引发剂及悬浮剂对其聚合过程、最终产物形态及上述性能的影响。制得的丙烯酸树脂的数均相对分子质量用凝胶渗透色谱(GPC)测定为3.9×104～6.2×104,相对分子质量分布为2.04～2.32;用红外光谱图表征了制得的丙烯酸树脂结构。差示扫描量热法(DSC)测定了聚合物的玻璃化转变温度(Tg)。     

挤出机各段温度对开孔型橡塑共混材料性能的影响

研究开孔型橡塑共混材料在不同挤出加工工艺中结构形态及力学性能的变化规律。结果表明，挤出机的机头温度应稍高于发泡剂的分解温度，均化段温度要设在发泡剂分解温度区的低温段，在挤出加工工艺中，要特别注意挤出机均化段温度及机头温度的设定，温度设定不好会使发泡剂无法发挥作用。     

深海锰结核及其处理技术新探索

简述了深海锰结核的特征及冶金处理原则,综述了当今国内外对锰结核的处理技术的工艺过程、操作条件、金属回收率以及各自的优缺点。介绍了具有探索性意义的处理锰结核的新型还原剂BR法、三相氧化法。提出了使用FFC剑桥工艺处理锰结核得到锰铁合金或有价金属的新思路,并介绍了锰铁合金的用途。     

不同制备方法所得PEN纤维的结构性能比较

利用高速纺丝法与纺丝拉伸一步法两种不同的方法制备聚萘二甲酸乙二酯 ( PEN)纤维 ,以DSC、X射线衍射、声速、力学测试等手段分析其结构、热学及力学性能并进行比较。结果表明 :以上两种纺丝法所制备 PEN纤维的晶型、晶粒尺寸不同 ;在所采用的高速纺丝速度范围内 ,分别以 6,7,8km/m in的速度纺制的试样结构性能基本相同 ;而纺丝拉伸一步法中不同的拉伸倍数对纤维的取向度影响较大 ,进而使杨氏模量、断裂强度和断裂伸长率变化较大