热虹吸式重沸器的选用和配管

对立式与卧式热虹吸式重沸器的性能进行了比较,指出立式热虹吸式重沸器具有传热系数高、结构紧凑、价格和安装费用低等优点,适合在处理的物料流量大、粘度高、易结垢的炼油装置中使用;而卧式热虹吸式重沸器广泛应用在处理的物料流量小、粘度低、不易结垢的精细化工装置中。从安装方式和进料方式等方面对重沸器的选用进行了讨论。最后,对重沸器配管设计中应注意的问题,如配管对温差损失的影响,降液管和升气管的型式和尺寸,管道的柔性设计以及进出料管的对称布置等问题进行了探讨。     

宝钢1号高炉改进性大修的设计

介绍了宝钢１号高炉改造大修设计的主要内容,着重论述了高炉一代炉役设计寿命由８年提高到１２年并争取达到１５年时在炉体各部位结构设计中,如炉体耐材砌筑、冷却结构、冷却水系统、炉体检测及炉体辅助设备等方面采取的一些改进措施。     

集成化工过程模拟系统的建立和应用

集成化工模拟系统的意义在于使化工过程的概念设计(包括摸拟、控制、设备估计、经济分析和评价等)实现一体化,这就要求系统在结构上更具有通用性和灵敏性。本文首先对集成模拟系统软件设计进行了描述,给出了系统的数据结构及框架;其次,介绍了这样一个集成模拟系统的模型软件及其应用;最后,讨论了今后该模型系统在几个主要方面的发展前景。     

可编程控制器在陶瓷粉料输送系统中的应用

介绍了可编程控制器(PLC)在陶瓷粉料输送系统中的应用,并从工艺要求、硬件配置、软件设计等方面分析了PLC运用的优点和注意要点     

蝶阀橡胶密封圈的试制

研究了EPDM、NBR的蝶阀橡胶密封圈。试验结果表明,蝶阀在1MPa压力下密封部位无漏水现象,产品性能满足了使用要求。     

Catalytic Materials for High-Temperature Combustion

Catalytic combustion, as an alternative to conventional thermal combustion, has received considerable attention during the past decade. Research efforts have been promoted by the need to meet governmental demands concerning pollution and the wish to use energy sources more efficiently. The two main advantages offered by catalytic combustors over flame combustors apply to these goals:

1. Catalytic combustion can be carried out over a wide range of fuel concentrations in air and at low temperatures.
2. These low temperatures result in attaining NO, emission levels substantially lower than possible with conventional combustors.

     

Continuous global optimization of structured process systems models

Nonconvex models for the optimization of process systems in chemical engineering give rise to multiple suboptimal solutions, and a number of complications that often cause failure of standard local optimization techniques. A deterministic branch and bound algorithm is presented in this paper for the global optimization of structured process systems models that include non-convexities introduced by concave univariate, bilinear and linear fractional terms. The proposed branch and contract algorithm relies on a bounds contraction operation, which consists of the solution of a finite sequence of convex bounds-contraction subproblems for the subset of nonconvex variables in a problem. The application of the proposed algorithm is illustrated with several numerical examples, which include heat exchanger networks, chemical reactors, simplified process flowsheets, and waste-water treatment systems. The results show that by executing the contraction operation at selected branch and bound nodes, large portions of the search region over which the objective function takes only values above a known upper bound are eliminated. It is shown that with the proposed approach the total number of nodes in the solution tree is kept relatively small, and for some problems, no branching is required at all.     

在不带膨胀节的固定管板式换热器强度设计中壳程圆筒材料与换热管材料的匹配

本文通过对不带膨胀节的固定管板式换热器管板强度的理论分析和实例计算,说明了壳程圆筒和换热管的材料性质对换热管轴向应力的影响,并根据此提出了在对不带膨胀节的固定管板式换热器进行强度设计时关于壳程圆筒与换热管材料匹配的几点建议。     

尿素─普钙系颗粒复混肥挤压造粒特性研究

对尿素─普钙系颗粒复混肥挤压造粒生产过程的影响因素及其变化规律进行了研究,在单困素实验基础上进行了正变试验,确定了各影响因素对过程影响的大小顺序及适宜的操作范围。