提高火电机组运行经济水平的若干方法初探     

茹林 《中国勘察设计》2012,(1):88-91

在对长期积累的生产数据进行分析总结的基础上,本文从机组运行方式、设备配置、技术改造等角度,论述了降低汽机发电热耗,提高燃烧效率,降低厂用电率的一些常规方法,并就各种具体技术、方法对提高机组经济水平的影响程度进行分析和比较。认为,通过综合应用当前比较成熟的多项技术,开展扎实有效的节能工作,国产机组的平均经济水平应该能够达到：200MW机组的供电煤耗为353g/kwh,电泵运行厂用电率为7.5%;300MW机组的供电煤耗为340g/kwh,在汽泵运行工况下,厂用电率在5%以下;600MW机组的供电煤耗达到310g/kwh的水平。  相似文献   

工程地质勘察钻探施工工作的几点体会   总被引：1，自引：0，他引：1  

沈振 《城市地质》2012,7(2):55-56

本人通过对多年来的工程地质勘察外业施工工作的总结,在钻孔结构设计,钻进方法选择、钻探技术及操作方法等几个方面,提出个人的几点体会,供读者在工程实践中参考。  相似文献   

播期对不同类型水稻生长及产量构成因素的影响     

朱红霞  杨沈斌  吴鹏飞  周晓冬 《南京气象学院学报》2014,6(3):240-243

通过分期播种,研究了不同播期对水稻生长和产量的影响.通过测定不同播期水稻抽穗期和成熟期的叶绿素、可溶性糖和氮的质量分数,分析不同播期对水稻生长的影响.结果表明Ⅰ期为两优培九和6两优9386最适宜播期,Ⅱ期为Ⅱ优084最适宜播期.播期对水稻单株穗数、每穗粒数、结实率、千粒重均有影响,尤其是对两优培九的结实率、6两优9386的每穗粒数有显著影响.研究结果可为合理利用南方气候资源、合理安排播栽播期、提高水稻产量提供理论依据和技术指导.  相似文献   

上海城市空气质量预报(日报)业务系统探讨   总被引：8，自引：1，他引：8  

谈建国  邵德民  黄家鑫  蒋明皓 《气象》2001,27(6):33-35

介绍了由上海市城市环境气象研究中心和上海市环境监测中心合作开发研制的上海城市空气质量预报（日报）系统的整体框架，包括数据资料采集，信息交换，预报制作和产品发布子系统，对用于城市空气污染物指日常预报服务的五种预测模式和方法及精度进行了讨论。  相似文献   

Performance of wuxi WWTP in china     

WANG Lin  WANG Li  JIANG YifengOcean University of China 《中国海洋大学学报(英文版)》2003,2(2):224-229

In Wuxi Wastewater Treatment Plant, the Anaerobic, anoxic and oxic (A2/O) process was employed to remove the nitrogen and phosphorus, which exhibited the positive results of the high removal efficiency for phosphorus with a range of 67.7% to 89.9% and an average value of 78.0. The effluent of phosphorus met the national discharge standard. The removal of TN was effected by both BOD variation of influent and wastewater temperature. TN removal was in the range of 28.5% to 55.8% with an average value of 39.4%. The energy cost was 0.15 kWh(m3d)-1 or 1.35 kWh(kgBOD·d)-1. The annual average sludge production was 46.3 m3d-1, the annual average dosage for the dewatering was 40 kgd-1.  相似文献   

Estimating bearing response in symmetric and asymmetric‐plan isolated buildings with rocking and torsion     

Keri L. Ryan  Anil K. Chopra 《地震工程与结构动力学》2006,35(8):1009-1036

A comprehensive approach is developed to estimate relevant design quantities—lateral deformations and axial forces—in isolation systems composed of lead–rubber bearings. The approach, applicable to symmetric and asymmetric‐plan systems, includes the effects of bidirectional excitation, rocking, and torsion; and is the culmination of previous work on this topic. The approach is based on nonlinear response history analysis of an isolated block using an advanced bearing model that incorporates the interaction between axial force and lateral response of the bearing, known as axial‐load effects. The rocking response of the system and peak axial forces are shown to depend on the isolation period, the normalized strength—or yield strength normalized by peak ground velocity, the ratios of rocking frequency about each horizontal axis to vertical frequency, and the normalized stiffness eccentricity. In an attempt to develop results widely applicable to asymmetric‐plan systems, eccentricity is introduced by varying the stiffnesses and strengths of individual bearings in an idealized, rectangular plan. This idealized system approach is shown to have limited success; when applied to actual asymmetric‐plan systems the design equations to estimate response are accurate for lateral deformations but err by up to 25% for axial forces. Copyright © 2006 John Wiley & Sons, Ltd.  相似文献   

Torsional balance of plan‐asymmetric structures with frictional dampers: experimental results     

Ignacio J. Vial  Juan C. de la Llera  Jos L. Almazn  Víctor Ceballos 《地震工程与结构动力学》2006,35(15):1875-1898

This investigation deals with the measured seismic response of a six‐storey asymmetric structural model with frictional dampers. Its main objective is to experimentally prove the concept of weak torsional balance for mass‐ and stiffness‐eccentric model configurations. The goal is to control the torsional response of these asymmetric structures and to achieve, if possible, a weak form of torsional balance by placing the so‐called empirical centre of balance (ECB) of the structure at equal distance from the edges of the building plan. The control of the dynamic response of asymmetric structures is investigated herein by using steel–teflon frictional dampers. As expected from theory, experimental results show that the mean‐square and peak displacement demand at the flexible and stiff edges of the plan may be similar in magnitude if the dampers are optimally placed. Frictional dampers have proven equally effective in controlling lateral‐torsional coupling of torsionally flexible as well as stiff structures. On the other hand, it is shown that impulsive ground motions require larger frictional capacities to achieve weak torsional balance. Copyright © 2006 John Wiley & Sons, Ltd.  相似文献   

用水计划与水价对华北工业企业用水的影响——以河北省为例   总被引：1，自引：1，他引：1  

周长青  贾绍凤  刘昌明  梁云峰 《地理研究》2006,25(1):103-111

工业是仅次于农业的用水大户,其用水的规模、方式和效率直接影响着华北地区总的用水需求。在对华北地区工业企业问卷调查的基础上,就影响企业效益的主要因素、用水计划对企业用水的影响、水费占总成本的比例、企业对目前和未来水价的看法、企业对提高水价的意愿、企业应对水价上涨的策略、企业对节水的态度和采取的节水措施等问题进行了分析。结果表明:用水计划对限制企业的用水有明显的作用;提高水价也有明显促进企业节水的效应。并选择了两个万元产值耗水量差别大的典型企业,对其13年来的用水情况进行了分析,验证了用水计划和水价对企业用水行为的影响效果。  相似文献   

试论土地利用总体规划与城市总体规划的协调   总被引：4，自引：0，他引：4  

陈常优  张本昀 《地域研究与开发》2006,25(4):112-116

文章首先分析了我国现阶段土地利用总体规划与城市总体规划的关系，认为这两项规划是国土规划中互有侧重、互为弥补、不可缺少的专项规划；其次，分析了这两项规划的主要矛盾，认为规划矛盾的主要原因是由于规划编制指导思想与方法不同、规划编制时间的差异及规划编制基础数据的不同造成的；最后，探讨了两项规划协调的原则、步骤和内容，认为规划应主要在人口规模、用地指标、城镇规模、建设工程规划项目及基本农田的划定等方面进行协调。  相似文献   

新型AgI末端燃烧器及其在增雨作业中的应用   总被引：4，自引：2，他引：4  

汪晓滨  毛节泰  郑国光  楼小凤  马舒庆  李仑格  关立友 《气象科技》2006,34(1):93-97

文章对我国新型AgI末端燃烧器的研制情况、结构和改造及其使用作了介绍,简述了这种新催化工具的特点,结合2002年12月至2004年9月,新型AgI末端燃烧器在河北、河南、青海、山东和北京飞机人工增雨探测作业试验,介绍了新型AgI末端燃烧器在3种增雨探测作业机型中的使用情况,并就其中遇到的问题进行了讨论,对如何结合探测作业飞机上所加载的GPS导航数据记录系统及其它辅助记录数据进行催化作业情况记录进行了说明。  相似文献