用MH-81′状态方程模拟液氮洗涤塔

本文采用MH-81′状态方程和与密度无关的局部组成型混合法则,从二元汽-液平衡数据得到的二元相互作用参数,预测了部分液氮洗过程中的二元体系的混合焓,结果满意。采用三对角矩阵方法,对两种不同工况的液氮洗涤塔进行了模拟,计算结果与设计值和实测值符合较好。     

Ozone Cooling Tower Treatment With and Without Mineral Removal

This paper builds on a prior paper by this author, McGrane (1991). In that paper, ozone is used as the sole means of cooling tower water treatment. The paper discusses water conservation by increased cycles of concentration, greatly increased efficiency through extremely low biological populations, and corrosion data which is compared to ozonated and chemically treated towers.

New in this paper are the results from the combination of a low pressure reverse osmosis system with ozone treatment for cooling tower water. Scale formation has continued to plague cooling towers with high concentrations of calcium in the make-up water. The use of a mineral removal system in cases of extremely hard water has made ozone an attractive alternative to traditional chemicals in many areas.     

环流式碳化塔研究与操作实践

遵循过程不冷却,结晶为控制过程等工艺原则、操作理论和技术路线,在 164×3620环流式碳化塔中分别进行了联合制碱法和氨碱法母液的碳酸化重碱结晶过程模拟试验,介绍了主要条件试验和连续运转120h的试验数据,讨论了晶浆浓度、操作过饱和度、液体环流速度、结晶温度和溶液碳化度等结晶过程工艺参数,考察了二氧化碳吸收传质总系数并比较了塔的二氧化碳吸收容积能力和重碱结晶容积能力,测定了碳酸氢钠平均结疤速度。     

优化甲醇工艺操作 提高产品质量

本文介绍了甲醇三塔精馏的产品质量控制及其影响因素 ,并提出了常压塔负压的处理方法。     

冷却塔修复与改造的技术经济分析

评述辽河化肥厂配套公用工程设施－美国玛利６００型７格塔冷却修复与改造项目的技术经济分析，叙述了该冷却塔现状，并据此拟定出的经济面实效的分期改造方案。     

离子膜法烧碱电解系统中螯合树脂塔的模块

阐述了离子膜法烧碱系统中螯合树脂塔的工艺设计和生产中已出现和可能出现的问题,并介绍了解决问题的方法。     

4#甲醇合成系统技术改造

介绍4^#甲醇塔合成系统塔内件、分离器、循环机的技术改造，改变了运行方式，改造后生产能力提高，热稳定性好，操作裕度大，触煤使用寿命延长，经济效益显著。     

Ozone Treatment in Cooling Water Systems

Ozone treatment for preventing the biofouling in cooling water systems is investigated.

In the fresh water system, the separating effect of the ozonated water on the microorganisms such as the sphaerotilus and the zoogloea which adhere to the piping and form the slime is recognized. When the ozonated water is supplied intermittently to the piping without stopping the flow of the cooling water, a constant volume of cooling water can be maintained. At the velocity of 1 m/sec, the amount of metal corrosion produced by the ozonated water is reduced on the mild steel, increased on the copper and does not change on the cast iron, when compared with that produced by the water containing no ozone.

In the seawater system, since many substances are oxidized by the ozone, the same treatment as that in the fresh water system cannot be applied. However, if the seawater in the cooling system can be replaced with ozone-containing air intermittently once a week, the adhesion of organisms such as barnacles and mussels to the piping can be prevented without having a bad influence on the other living oceanic organisms.     

输电塔-线体系覆冰作用非线性分析

在重冰区,高柔大跨越输电塔-线体系在覆冰、风载等作用下具有强烈的耦合特性和非线性特征。推导了绝缘子、索以及边界条件的刚度表达式,以向家坝-上海±800kV特高压直流输电线路为例,建立了输电塔、导线、绝缘子以及边界条件的简化数值分析模型。对大跨越输电塔－线体系进行了7种工况下的静力非线性分析。分析表明,在导线均匀覆冰及风荷载作用下,铁塔构件的P-△效应较小;在不均匀覆冰工况下,导线不平衡荷载对铁塔产生扭转效应,铁塔受压支座节点和最大悬臂处单元的轴向压力和弯矩具有较明显的P-△效应,应考虑荷载非线性的不利影响。     

单角钢螺栓连接节点板拉剪性能研究

对某角钢塔典型节点进行足尺试验研究和有限元参数分析,考察单角钢连接节点板受拉剪时的工作性能和破坏模式.结果表明,单角钢连接节点板受拉剪时可能发生块状拉剪撕裂和受拉断裂两种破坏模式;垂直于受力方向的螺栓孔间距、顺受力方向的螺栓孔间距和节点板形状对单角钢连接节点板的极限承载力有显著的影响;偏心作用只会降低节点板的屈服破坏承载力,对其极限承载力影响甚小.通过可靠度分析,评价现有节点板设计方法用于单角钢连接节点板的适用性.