电解铝大功率硅整流机组的运行和分析

本文通过对丹江口铝业公司电解二厂大功率硅整流机组中变压器、大功率硅整流器各项关键值的计算,介绍该厂电解铝大功率硅整流机组的运行状况及技术经济分析。     

计算机控制大功率晶闸管整流设备的应用

本介绍了计算机控制大功率晶闸管整流设备的系统组成、功能、特点及在氯碱生产中的应用效果。     

直流电弧炉用大功率晶闸管整流装置

介绍一种单电极直流电弧炉用大功率晶闸管整流装置的组成和工作原理。该装置采用同相逆并联接法，设有短锁环，实际运行性能良好     

大型客滚船冷却水系统的方案优化

本文对该船冷却水系统的两种设计方案进行了计算、对比和分析，由于选取了合理的设计方案，不仅了保证了冷却效果，而且还大幅度的节省了船上电站的功率。     

整流机组的可靠性分析

在整流机组的可靠性中，元件是基础，设计是关键，环境是保证。文章对整流机组的可靠性，元件的可靠性及提高措施进行了论述。     

平阴铝厂整流机组经济运行分析

通过对流机组的功率损耗分析计算,选择整流机组的经济运行方式,从而达到节能降耗的目的。     

大功率晶闸管整流装置在电解铝行业的应用分析

晶闸管整流器在实际设计和应用中与二极管整流器有一定相似性。为了推动电解铝行业的发展，相关技术和工作人员应充分利用大功率晶闸管在电解铝行业中的有效应用，增强其使用价值，并带来生产和生活的优势。本文从大功率晶闸管整流装置的优势、故障检测和主要应用措施三个方面展开深入研究和分析，为电解行业的发展起到积极推动作用。     

石墨化炉用3 340 kVA整流机组的改造

介绍石家庄炭素有限责任公司对石墨化炉用3340kV整流机组的技术改造,取得了较好的经济效益。     

大型可控硅整流装置正反向保护系统的开发应用

本文就大型可控硅整流装置正反向保护系统的开发与应用进行了探讨。     

喷雾推进冷却塔在炼钢氧枪冷却水系统的应用

介绍了喷雾推进通风冷却塔在济钢一炼钢厂氧枪冷却水循环系统中的应用。运行情况表明:较之传统的机械通风冷却塔,喷雾塔具有冷却效果好,节能效益显著,一次性投资省,运行维护可靠方便的优点。该塔在同类型企业中具有广泛的应用前景。     

磁场处理水用于锅炉和冷却水处理

本文从理论和实践上综述了磁化水的特性、磁化机理、国内外的发展近况及其使用安装等。该法用于锅炉和各类冷却水处理有广泛的前景。     

大型可控硅整流装置正反向保护系统的开发与应用

山东铝业公司电解铝厂第二整流所是一个电压等级为１１０ｋＶ、负荷为４０ＭＷ的整流变电站,主要设备有３台４５ｋＡ５００Ｖ的整流器,始建于１９９５年。投运初始,由于国内没有厂家能生产同时测量正反向电流的直流传感器,所以当时整流器的反向保护是通过测量正向电流并进行相应的处理后实现的。虽然也能实现反向保护功能,但却存在一个抗干扰性能差、误动作和可靠性差的问题。而可能产生的反向电流又实实在在地威胁着整流器的安全运行。针对以上问题我们开发研制了一套可靠的正反向保护系统,并在我厂投入应用。从近两年的运行情况看,…     

Removal of TDS from Cooling Tower Water by Using EDTA-Modified Bagasse Fibers

Modified by ethylenediaminetetraacetic acid (EDTA) salts and unmodified bagasse fibers were tested for the removal of total dissolved solids (TDSs) from cooling tower water. Parameters such as hydrogen ion concentration (pH), particle size of bagasse fibers, and the concentrations of adsorbent and adsorbate were studied to optimize the conditions to be applied on a commercial scale for the decontamination of effluents of cooling tower water. The optimum pH for TDS removal was between 6 and 6.5. The efficiency of TDS removal increased when the size of fiber particles decreased (100?μm) and when the concentration of EDTA salt increased to reach 78 mg/g of modified bagasse fibers. The adsorption parameters were determined using both Langmuir and Freundlich isotherms. The preferential mechanisms for the retention of TDSs are a complexation process between the TDSs and chemical functions present on the surface of fibers, and the chelation process with the EDTA attached to the fibers. The results obtained could be valuable for application to cooling tower water treatment and for the softening of hard drinking water.     

Hydrodynamic Modeling of Coastal LNG Cooling Water Discharge

The evaluation of the mixing zone for a proposed expansion to a liquefied natural gas facility on the northeast coast of the State of Qatar in support of an environmental impact assessment was performed using the Generalized Environmental Modeling System for Surface Waters (GEMSS). The circulating seawater at the facility absorbs heat during the liquefaction of natural gas, resulting in a maximum temperature rise of 10°C. The heated seawater is discharged through a long canal into the Arabian Gulf with minimum jet momentum. GEMSS was calibrated, verified, and then used to model the thermal plume for a proposed expansion of the facility. A probabilistic approach for defining the mixing zone using World Bank standards was developed. Model results show that the thermal plume is vertically stratified, with a relatively large surface area and a relatively small bottom contact area. The advantage of this design is that it maximizes heat exchange with the atmosphere by increasing the driving force and isolating the temperature increase from benthic organisms.     

Soft-Sensing Method of Water Temperature Measurement for Controlled Cooling System

Withthedevelopmentofproductiontechnolo gy ,the productionbecomesmoreandmorecom plex ,andtherequirementsforcontrolsystemarein creasinglystrict .Itisessentialfortheprocessstabil ityand productqualitytorealizereal timecontroloptimization .Butitisdifficulttogetsomeimpor tantparametersbymeasuringinstrumentssuchassensorsformanyprocesses .Forcontrolofsuchpro cesses ,therearegenerallytwomethods :oneisindi rectqualityindexcontrol ,e g sensitiveplatetem peraturecontrol ,differentialtemperatureanddoubled…     

大功率可控硅整流装置运行过程中的谐波探讨

对山铝电解铝厂大功率可控硅整流装置运行过程中的谐波进行测试,发现系统存在着较严重的非特征谐波,分析了非特征谐波产生的主要原因,并相应地采取了抑制措施。     

Application of Cooling Water in Controlled Runout Table Cooling on Hot Strip Mill

The controlled runout table cooling is essential in determining the final mechanical properties and flatness of steel strip. The heat of a hot steel strip is mainly extracted by cooling water during runout. In order to study the heat transfer by water jet impingement boiling during runout, a pilot facility was constructed at the University of British Columbia. On this pilotfacility, the water jet impingement tests were carried out under various cooling conditions to investigate the effect of processing parameters, such as cooling water temperature, water jet impingement velocity, initial strip temperature, water flow rate, water nozzle diameter and array of water nozzles, on the heat transfer of heated strip. The results obtained contribute to the optimization of cooling water during runout.     

循环冷却水系统节能方案设计实践

从能量守恒定律出发,分析了循环冷却水系统各构成单元的能量转化过程。以降低循环冷却水系统运行能耗为目标,剖析了可采用的三种节能技术。结合钢铁生产工艺中的循环冷却水系统现场,通过数据采集、运行状况诊断、技术方案设计及节能评估,完整阐述了循环冷却水系统节能方案实践过程。