共查询到18条相似文献,搜索用时 63 毫秒
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论火电厂热力系统节能 总被引:2,自引:0,他引:2
<正> 火电厂的节能可以归结为两个方面:一是针对锅炉、汽轮机和主要辅机,提高主机的热效率并降低辅机的电耗,达到节能;二是针对热力系统,优化和完善热力系统及其设备,改善运行操作,提高运行效率,实现节能。一、热力系统节能的途径 1.节能诊断,优化改造应用热力系统节能理论对热力试验或热 相似文献
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热力系统拓扑分析的热平衡计算方法是火电厂热平衡计算中最成功的计算机处理方法。本文首先提出并深入研究这一问题,对方法的理论基础、软件设计中的有关问题和应用前景进行分析,该文是对热力系统热平衡计算的全新认识。 相似文献
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热力系统拓扑分析的热平衡计算方法是火电厂热平衡计算中最成功的计算机处理方法。本文首次提出并深入研究了这一问题,对方法的理论基础、软件设计中的有关问题和应用前景进行分析。该文是对热力系统热平衡计算的全新认识。 相似文献
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火电厂热力系统级的划分方法研究 总被引:4,自引:1,他引:4
火电厂热力系统状态方程与电厂热力系统结构一一对应,为越来越复杂的电厂热力系统的热经济性计算、分析与综合提供了新的基础和研究方法。热力系统状态方程的建立是以级为基础进行的,针对热力系统中级的划分方法进行了探讨,对从热力系统各管路出入热力系统的小汽水流量、热量及功划分到哪一级加热器级进行了定量分析,得出了这些小汽水流量、热量及功均可划分到与其相邻的任一级加热器级而不影响热经济性,而且不影响热力系统状态方程的填写规则,因此,为方便起见,加热器级的边界的选取应根据实际热力系统中测点的布置情况(或已知的参数)而定,而不一定以加热器的出口为界。 相似文献
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In the solar tower concept, a multiplicity of mass produced heliostats reflect sunlight to a an elevated central receiver where it is absorbed as heat and transported to the ground. This paper presents the results of an NSF/RANN funded study of the technical and economic feasibility of this approach for powering a 10–500 MW electrical generator. A computer model of the collector system is described and results illustrative of the high performance of the system are presented. Detailed heliostat design studies have shown a silvered float glass mirror supported on a welded steel grid and guided in elevation and azimuth by a receiver oriented optical sensor and feedback circuit can be mass produced economically. Conceptual designs of the tower and receiver show them to be a minor cost component. With careful attention to thermal cycle fatigue, the receiver will present only a minor technical risk. The cost of electricity in the intermediate load range is competitive with the upper range of fossil fuel costs. 相似文献
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为了解决用户负荷需求在时间上的变动和传统冷热电联供(Combine Cooling, Heating & Power, CCHP)系统大部分时间处于非设计工况下运行导致系统的能源利用效率较低的问题,提出了一种耦合压缩空气储能系统(Compressed Air Energy Storage system, CAES)和蓄热装置的新型CCHP系统(CAES based CCHP system,CAES CCHP),建立系统的热力学模型,在给定的充、放电工作条件下对CAES CCHP系统的热力学性能进行分析,并对影响该系统性能的CAES压气机压缩比、透平进气口压力、流经CAES的烟气质量流量3个关键参数进行敏感性分析。研究结果表明:CAES CCHP系统能实现冷热电灵活调控,且系统的CAES功转换效率为57.41%,一次能源利用率、一次节能率及火用效率分别为76.22%,24.84%和31.97%,比传统的CCHP系统分别提高10.97%,18.15%和7.58%。 相似文献
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Cold-end systems are heat sinks of thermal power cycles, which have an essential effect on the overall performance of thermal power plants. To enhance the efficiency of thermal power plants, multi-pressure condensers have been applied in some large-capacity thermal power plants. However, little attention has been paid to the optimization of the cold-end system with multi-pressure condensers which have multiple parameters to be identified. Therefore, the design optimization methods of cold-end systems with single- and multi-pressure condensers are developed based on the entropy generation rate, and the genetic algorithm (GA) is used to optimize multiple parameters. Multiple parameters, including heat transfer area of multi-pressure condensers, steam distribution in condensers, and cooling water mass flow rate, are optimized while considering detailed entropy generation rate of the cold-end systems. The results show that the entropy generation rate of the multi-pressure cold-end system is less than that of the single-pressure cold-end system when the total condenser area is constant. Moreover, the economic performance can be improved with the adoption of the multi-pressure cold-end system. When compared with the single-pressure cold-end system, the excess revenues gained by using dual- and quadruple-pressure cold-end systems are 575 and 580 k$/a, respectively. 相似文献
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在对电力电缆运行方式、信息管理模式进行了调研的基础上,针对地区电力局电力电缆运行管理的现状,综合考虑了电力电缆网络分布兼具运行属性和地理空间属性的特点,提出了基于全新构架的B/S和C/S混合模式的三维地理电缆信息管理系统的总体开发方案。实现了对电力电缆的空间信息、工程信息的综合管理;可对电缆的运行、维护、检修以及缺陷管理、事故管理等进行全方位的管理。利用该系统来管理电力电缆,可以节约大量的资源,提高工作效率,提高管理质量。 相似文献
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The paper addresses the system performance of coal-fired power unit with changed auxiliary system or other localheat disturbance.The idea of state space model is imported and the universal formula for the calculation of sys-tem performance output is deduced on the system state equation.Two important vector of system are worked outunder linear system assumption and transform.The transfer matrix is the characteristics of system itself and isconstant for a similar condition,which greatly facilitates the analysis.The concept of thermal disturbance vectoris proposed to construct the thermal disturbance input easily.The method can be helpful for analyzing any ther-mal disturbance input satisfying the assumption and also for supplementing the correction means of performancetest.An example of 600MW power unit is presented to demonstrate its availability. 相似文献