氯碱厂蒸发工艺能耗分析及节能技术改造

氯碱厂烧碱的蒸发是烧碱生产系统的一个重要环节 ,并且是一个能耗较多的生产过程。本文针对内蒙古某氯碱厂蒸发工艺能耗情况作了较详细的分析 ,并对烧碱蒸发工序进行了一系列节能技术改造 ,使烧碱蒸发能耗明显降低 ,企业经济效益亦明显增加。     

联产供冷与电力供冷能耗比较分析

文中将两种供冷能耗比较分解成用电煤耗差、用热煤耗量、增加产汽用电煤耗量三部分进行分析，按照热量法得出在目前一般情况下联产供冷比电力供冷通常费能和定性定量结论，为全面研究比较热电冷联产与分产的能耗奠定一个基础。     

合成氨扩能改造中锅炉存在的问题及采取的措施

针对天脊集团年产30万t合成氨扩能改造,给2台225t/h高压锅炉带来的除氧器热量过剩、锅炉给水温度升高、主蒸汽温度降低等一系列问题,分析了产生问题的原因,从节约能源、提高锅炉效率考虑,提出了相应的解决问题的办法:利用热量分流、改造省煤器管、增加二级过热器受热面积。经过3年多的生产实践证明,取得了良好的效果。     

The influence of raw material characteristics on the industrial pelletizing process and pellet quality

Industrial pelletizing of sawdust was carried out as a designed experiment in the factors: sawdust moisture content, fractions of fresh pine, stored pine and spruce. The process parameters and response variables were energy consumption, pellet flow rate, pellet bulk density, durability and moisture content. The final data consisted of twelve industrial scale runs. Because of the many response variables, data evaluation was by principal component analysis of a 12 × 9 data matrix. The two principal component model showed a clustering of samples, with a good reproducibility of the center points. It also showed a positive correlation of energy consumption, bulk density and durability all negatively correlated to flow rate and moisture content. The stored pine was more related to high durability and bulk density. The role of the spruce fraction was unclear. The design matrix, augmented with the process parameters was a 12 × 6 matrix. Partial least squares regression showed excellent results for pellet moisture content and bulk density. The model for durability was promising. A 12 × 21 data matrix of fatty- and resin acid concentrations measured by GC–MS showed the differences between fresh and stored pine very clearly. The influence of the spruce fraction was less clear. However, the influence of the fatty- and resin acids on the pelletizing process could not be confirmed, indicating that other differences between fresh and stored pine sawdust have to be investigated. This work shows that it is possible to design the pelletizing process for moderate energy consumption and high pellet quality.     

电力负荷削峰减载系统在珠钢电炉的应用

借助现场采集装置,在计算机上获取每一分钟的冶炼工艺电能需求量,显示当前15分钟时段已发生的电耗量,调整用户设定,实现需量自动刷新、报警和专家分析推荐后续用量;实现平稳用电并减少对电网冲击,同时降低电能最大需用量以减少成本。     

Drying Kinetics of a Porous Spherical Particle and the Inversion Temperature

A model is presented for drying of a single porous particle with superheated steam and humid air. Experimental data for spherical porous ceramic particle reported in the literature were used for the validation of the model. An inversion temperature at which the evaporation rates within superheated steam and humid air are equal was predicted. The effect of thermophysical properties of the particle (permeability 10^-14 - 10^-17 m², diameter 3 × 10^-3 - 10 × 10^-3 m) and operating variables (gas mass flux 0.26 - 0.78 kg m^-2 s^-1, drying agent temperature 120-200°C) is tested. The inversion temperature is shown to be affected by the thermophysical properties of the porous particle and of the drying agent.     

运用现代CFD方法设计高效率的汽轮机(续前期)

论述了运用现代计算流体动力学(ComputationalFluidDynamics,CFD)技术设计高效率汽轮机的方法,典型应用的实例有全三维叶片级流场、叶片汽封和排汽蜗壳计算。计算结果和实际是相符的。进一步对结构性单元和非结构单元程序的计算结果进行了比较,已证明,非结构单元CFD程序用于复杂形状的流场计算时,结果与实际相当一致,并具有独特的功能。     

解决废钢短缺是特钢业发展的关键

随着短流程炼钢的迅速兴起，废钢消耗量急剧增加，世界范围内废钢供应已经出现了严重缺口，我国每年须从国际市场进口大量废钢才能满足钢铁生产的供需平衡，在我国废钢已成为紧缺资源，影响着我国特钢业的发展。分析了这一形势，并初步探讨了解决这一问题的方法，建立合理的废钢储备及使用体系，使废钢资源合理化流动，同时积极探寻优质的废钢代用品，以便从根本上解决我国废钢短缺问题。     

宾馆酒店蒸汽冷凝水回收问题剖析

分析了宾馆酒店进行冷凝水回收所遇到的各种问题，提出了应对策略和解决方法，介绍了取得的应用效果。     

SoC低功耗设计中的DVS技术

随着系统芯片(SoC)集成更多的功能并采用更先进的工艺,它所面临的高性能与低功耗的矛盾越来越突出.动态电压调整(DVS)技术可以在不影响处理器性能的前提下,通过性能预测软件根据处理器的繁忙程度调整处理器的工作电压和工作频率,达到降低芯片功耗的目的.文中讨论了DVS技术降低功耗的可能性,介绍了如何利用两种不同的DVS技术让处理器根据当前的工作负荷运行在不同的性能水平上,以节省不必要的功耗.