模糊PID控制在烟酸反应釜温度控制中的应用

文章讨论了烟酸生产过程中反应釜温度控制的设计问题.由于在化学反应过程中反应釜特性不断变化,造成PID控制的困难.结合控制系统的特点,采用了模糊PID控制技术,使PID参数能够根据对象的变化进行适当的参数自整定,解决了烟酸生产中的关键控制难题.     

高压电机起动的饱和电抗器设计

介绍高压电机起动用饱和电抗器参数的选择及设计方法,并给出了具体例子。     

Transient pressure analysis for the reactor core and containment of a HTGR after a primary loop pressure boundary break accident

The pressure variances in the reactor core and containment of a High Temperature Gas-cooled Reactor (HTGR) after a primary loop pressure boundary break accident determine the structural integrity and safety of the reactor. Based on mass conservation, energy conservation and state equations, explicit formulae for the transient pressure and temperature variances in the pressure vessels were deduced, and a set of differential equations for the transient pressure and temperature variances in the containment were developed. Numerical simulation was also conducted to investigate the transient pressure and temperature variances in the pressure vessels and containment. The results show that energy transformation due to expansion work cannot be neglected. The maximum pressure in the containment could increase by 40 percent due to blockage caused by air in the containment. Detailed numerical simulations of the transient pressure and temperature variance in the reactor core flow passages were also conducted. The results show that the pressures acting on the reactor core and containment are below acceptable values.     

A brief introduction to neutron activation analysis in China

The history, the major achievements in both methodology and applications, the current trends and future perspectives of neutron activation analysis (NAA) in China are briefly described.     

SCWR for Future LargeScale Nuclear Power Generation

The ambitious nuclear power program motivates the Chinese nuclear community to develop advanced reactor concepts of generation IV, in order to ensure the longterm, stable and sustainable development of nuclear power. The supercritical watercooled reactor (SCWR) has favorable features in economics, sustainability and technology availability. It is the logical extension of the existing PWR technology and has very promising perspectives in largescale power generation in China. This paper describes the main features of SCWR. New designs of SCWR core structure and fuel assemblies are proposed. Preliminary analysis using a coupled neutronphysics/thermalhydraulics method is carried out and shows a good feasibility of the new design proposal.     

乏风瓦斯热逆流反应器的流动压力损失特性

分析了热逆流反应器压力损失的组成和机理,上下集气箱内和陶瓷床内部的摩擦阻力损失和陶瓷床进出口的局部损失,建立了各部分压力损失的相应公式并根据实验数据进行了计算.结果表明:陶瓷床进出口的局部流动损失远小于摩擦阻力损失,因此可以在损失分析时忽略以使问题简化;下集气箱中的摩擦阻力损失明显大于上集气箱和陶瓷床,并且对进口流速的增长最为敏感,在总损失中占据首位;给出了热逆流反应器的总压力损失计算公式,应用该式可对不同流量工况下的总损失进行计算.     

CuZnAl双功能催化剂上一步法合成二甲醚的工艺研究

探讨TC301／γ-Al2O3和C207／γ-Al2O3双功能催化剂上合成气一步法制取二甲醚的反应,考察了催化剂浓度、原料气氢碳比和搅拌转速对一氧化碳转化率和二甲醚收率的影响．结果表明：在浆态床反应器内,催化剂C301的催化效果优于C207,且催化剂最佳浓度为7．27％;在300r／min搅拌转速下,外扩散阻力的影响基本可以消除;当原料气氢碳比为1．0时,二甲醚收率最大,进而提出利用富碳合成气生产二甲醚是缓解能源问题和减少能源污染的一条新途径．     

生物质热解研究进展(综述)

从生物质能的转换方式出发,主要介绍了热解反应器、快速热解、催化热解、影响因素、热解产物等研究现状,分析了生物质主要成分的热解机理,指出了这些技术中需要解决的问题以及目前的主要研究方向。     

砾间接触氧化反应器中微型动物种类及其贡献解析

通过3组平行试验,验证了生物砾石接触氧化法处理生活污水的可行性.结果表明:连续曝气的处理效果最佳.在3组试验装置的好氧生物膜中,检测出6种微型生物:钟虫、草履虫、轮虫、线虫、盾纤虫和体虫.其中,体虫未在间歇曝气装置中出现.连续曝气装置中检测到的微型生物种类与数量均多于间歇曝气装置.微型动物对剩余污泥减量的贡献可归纳为:增长食物链;直接对污泥进行摄食和消化,在减少污泥容量的同时增加污泥的可溶性;利用微型动物来增强细菌的活性或增加有活性的细菌数量,从而增强细菌的自身氧化和代谢能力,减少剩余污泥量.     

填充床放电等离子体反应器对铜绿微囊藻的去除

研究了多根高压电极型填充床放电等离子体反应器对铜绿微囊藻光密度的去除.探讨了高压电极材料、气量、峰值电压和脉冲频率对填充床放电等离子体反应器中铜绿微囊藻光密度去除的影响.结果表明:高压电极材料对铜绿微囊藻光密度的去除不太明显;铜绿微囊藻光密度去除率在处理当天随气量、峰值电压、频率增加而增强的作用效果不明显;而是在放置培养期间,铜绿微囊藻生长受抑制的程度加强,光密度去除率增加.