Mathematical model for cooling process and its self-learning applied in hot rolling mill

Control precision of coiling temperature is one of the key factors affecting the profile shape and surface quality during the cooling process of hot rolled steel strip. For this reason, the core of temperature control precision is to establish an effective cooling mathematical model with self-learning function. Starting from this point, a cooling mathematical model with nonlinear structural characteristics is established in this paper for the cooling process of hot rolled steel strip. By the analysis of self-learning ability, key parameters of the mathematical model could be constantly corrected so as to improve temperature control precision and adaptive capability of the model. The site actual application results proved the stable performance and high control precision of the proposed mathematical model, which would lay a solid foundation to improve the steel product qualities.     

置换通风加冷却顶板系统存在的问题及解决措施分析

介绍了置换通风加冷却顶板空调系统,分析了冷却顶板所承担制冷量的大小和冷板在顶棚的位置对室内气流的影响,总结了针对该系统结露问题的解决措施,为该系统在工程上的应用提供一定参考。     

凝结水中溶解氧超标原因分析及处理

某火力发电厂2号机组凝结水中的溶解氧含量在冬季供暖期间一直不能达到合格范围,溶解氧合格率逐月下降.针对凝结水溶解氧超标问题进行全面排查调整,查找出了机组凝结水溶解氧超标的原因并对存在的问题进行处理,最后总结出凝结水溶解氧超标的调整方法.     

一种机房水冷空调节能系统的设计方案

目前节能降耗已经成为各行业共同的目标,本文提出的方案主要是通过对空调室外机进行改造,对机房流出的循环水进行自然冷却,使空调在冬季减少开机时间,在保证机房中设备正常运行的同时能有效地降低能源消耗。     

水质稳定的技术经济分析——以邢钢钢厂循环冷却水为例

对邢台钢铁公司炼钢厂的转炉和连铸循环冷却水的水质稳定进行了技术经济分析.在分析的基石出上采取了一些措施,使投药费用大大下降,收到了良好的技术经济效果.     

Numerical Analysis of Influencing Factors on Temperature Field and Airflow Distribution of the Displacement Ventilation System

Indoor air quality and thermal comfort are important features of indoor environment, In this paper, a numerical simulation based on the k-ε model of CFD is used to analyze factors such as loading, exterior-protected construction, blowing-in rate that play an important role in the temperature field and airflow field of the displacement ventilation system. Exterior-protected construction has little influence on indoor temperature distribution of displacement ventilation systems and the influence is limited only in a small area near the external wall when the indoor heat source is the main cooling load. The height of a room has little influence on indoor temperature field, and the temperature gradient of active region is basically unchanged. In the system combined with a displacement ventilation system and a cooling system, the height also has little influence. When the cooling load is high,the indoor heat source creates a strong convective plume, which will make the average indoor air age lower, the ventilation efficiency higher and the elimination of pollutant easier. Air supply rate plays an important role in displacement ventilation systems. The increase of air supply rate that can be realized by increasing the air supply velocity and enlarging the area of air inlet will increase the mass capability of the system and diminish the vertical temperature gradient. From the comparison between simulations and experiments, it is concluded that this simulation are creditable.     

浅谈发动机冷却系统的优化

发动机冷却系统是汽车的重要组成部分,其稳定运行对发动机的安全性、经济性有着重要影响。从冷却系统散热器的性能及影响因素、冷却风扇主要参数的计算及选型、风扇噪声的影响、冷却系统仿真等方面,分析发动机冷却系统,可知冷却系统轴流风扇的速度三角形和汽车外部的温度场、风速场的分布,并由此提出优化方案。     

极端气象事件与城市安全设计

“工欲善其事,必先利其器”,这是防灾减灾的关键.必须在城市建设中高度重视面对气象极端事件下的综合安全设计与管理.本文认为,由于巨型地震灾害频发,我们在防震减灾技术上投入精力较大,而对防御极端气象灾害有所忽视,因此,多方位强调城市安全的综合设计极为必要.     

九十年代散文的繁荣与冷清

散文发展到20世纪九十年代,表现出了一股强劲的发展势头。创作主体、创作对象、创作手法都呈现出多元化倾向,因此,有人说散文热了。但是,在这种所谓的繁荣后面,同时可以看到,一部分散文品质低劣,理性缺失,矫情之作泛滥,“散文是热闹了,但却并不是繁荣”。进入二十一世纪,散文创作应该正视其自身的缺陷,真正去创一个散文的繁荣时代,真正实现“太阳向着散文微笑”。     

冷却塔施工技术改进

钢筋砼双曲线冷却塔施工难度大，施工前自行编制了塔壁厚度计算程序，利用计算机计算出准确数据，采用自承式脚手架、定型组合钢模板、塔式起重机垂直运输的施工工艺获得成功，与传统工艺相比节省费用50万元。