燃机选型分析

燃机发电作为占世界发电量1／5的发电方式,在世界工业发展中占据不可替代的地位,E级、F级燃机为中国燃机的主力机级,现对两种机级的性能、经济性以及电厂选级进行对比,指出无论从燃机本身的性能,还是燃气一蒸汽联合循环的性能,F级燃机均优于E级燃机,并介绍现今世界前沿的G级燃机一些睛况。     

飞灰再循环燃烧系统在燃用无烟煤循环流化床锅炉的应用

文中介绍了韶能集团下属耒阳综合利用发电厂飞灰再循环系统的设计方案和运行状况。运行结果显示：飞灰再循环技术显著降低了燃用无烟煤的循环流化床锅炉飞灰含碳量、提高锅炉燃烧效率,节能降耗效果显著。     

Particle swarm optimization for redundant building cooling heating and power system

An optimal and redundant building cooling heating and power (BCHP) system can yield economical savings, but more importantly can save energy as well as reduce the emission of pollutants. This paper presents the energy flow analysis of the conventional separation production (SP) system and the redundant BCHP system. Four decision variables (the capacity of power generation unit (PGU), the capacity of heat storage tank, the on–off coefficient of PGU and the ratio of electric cooling to cool load) to be optimized are selected in consideration of the design and the operation strategy of BCHP system. An objective function to simultaneously measure the energetic, economical and environmental benefits achieved by BCHP system in comparison to SP system is constructed and maximized. Particle swarm optimization algorithm (PSOA) is employed to search the optimal solutions. A case study of BCHP system with thermal storage unit and hybrid cooling system is presented to ascertain the feasibility and validity of the optimization method.     

Natural Methods of Interaction Or Natural Interaction in the Everyday Digital World

Computers, mobiles and automatised machines are so omnipresent that the means by which we interact with digital devices is now generally regarded as a given. Italian practice iO Agency, though, questions our use of mechanised interfaces and the language that they require us to learn. Valentina Croci explains how iO Agency has developed more natural ways for people to interact with digital environments through physical or tactile ‘triggers’. Copyright © 2008 John Wiley & Sons, Ltd.     

Techno-economic evaluation of thermo-chemical biomass-to-ethanol

Bio-ethanol has received considerable attention as a basic chemical and fuel additive. Bio-ethanol is presently produced from sugar/starch materials, but can also be produced from lignocellulosic biomass via hydrolysis-fermentation route or thermo-chemical route. In terms of thermo-chemical route, a few pilot plants ranging from 0.3 to 67 MW have been built and operated for alcohols synthesis. However, commercial success has not been found. In order to realize cost-competitive commercial ethanol production from lignocellulosic biomass through thermo-chemical pathway, a techno-economic analysis needs to be done. In this paper, a thermo-chemical process is designed, simulated and optimized mainly with ASPEN Plus. The techno-economic assessment is made in terms of ethanol yield, synthesis selectivity, carbon and CO conversion efficiencies, and ethanol production cost. Calculated results show that major contributions to the production cost are from biomass feedstock and syngas cleaning. A biomass-to-ethanol plant should be built around 200 MW. Cost-competitive ethanol production can be realized with efficient equipments, optimized operation, cost-effective syngas cleaning technology, inexpensive raw material with low pretreatment cost, high performance catalysts, off-gas and methanol recycling, optimal systematic configuration and heat integration, and high value byproduct.     

重庆夜景灯饰对社会经济发展作用研究

重庆夜景在国内外享有一定声誉,是重庆的城市名片和旅游品牌,大量的调查显示：重庆夜景建设带动了旅游、餐饮娱乐等相关行业的发展,极大地提升了重庆城市形象和品位,改善了投资环境,丰富了市民生活,极大促进了重庆的社会经济发展。     

印度保障能源安全的举措及启示

印度在能源安全方面面临多重挑战,能源需求不断增长,对外依存度进一步扩大。印度通过能源外交,促进了能源多样化发展,开辟了稳定的海外石油供应渠道,增强了能源技术创新能力,保证了印度的能源安全和经济的持续稳定增长。     

中部地区城市历史地段的保护与发展初探——以湖北襄樊市陈老巷历史文化街区为例

该文以襄樊市陈老巷历史文化街区保护为例,研究我国中部地区历史文化街区的改造问题,分析经济因素主导下历史文化街区的改造策略,按照城市-地段-街区-建筑一细部的层次,探讨了城市发展过程、周边地块演变、产权关系变革以及居民构成关系对历史文化街区保护的影响．思考了单体建筑保护评价体系建立、地域性建筑语言体系建构对历史文化街区的保护意义     

世界文化遗产定义的新界定

文章在对文化、文化资源定义的基础上,对世界文化遗产的定义做了新的界定。该文认为：文化遗产包括文化资源和文化产业两个子系统。而文化资源则包括文化基因、文化载体、文化环境、文化市场。本定义的原创点在于突出了文化遗产的信息性和经济性两大本质属性。同时,自觉地运用基因理论来研究文化遗产,兼顾有形文化载体和无形文化载体两个层次也是此定义的特色所在。     

当代重庆“一字诀”

本文以“一字诀”的组织形式例举近年来重庆的发展特征,希望能够大致勾勒出一个不只具有面孔还有性情的重庆轮廓.