共查询到20条相似文献,搜索用时 171 毫秒
1.
2.
3.
功热并供国热燃气轮机及其热力分析张娜,蔡睿贤(中国科学院工程热物理研究所北京100080)关键词功热并供;回热;当量效率1前言回热和功热并供的主要效果都是降低燃气轮机的排热温度,尽可能地回收余热。本文建议在回热之后,再利用其余热加热热水,以尽可能提高... 相似文献
4.
5.
联合循环、STIG循环、HAT循环及其相关循环的热力性能比较 总被引:3,自引:0,他引:3
1引言本文分析并比较了燃气一蒸汽联合循环(CC)(图川山、注蒸汽燃气轮机(STIG)循环z图2)l’]、湿空气透平(HAT)循环(图3)[’1及采用中冷或再热手段后相应循环的性能.为了不使系统过于复杂,只采用一级中冷、一级再热,中冷器和再燃室的位置与通常的设计相同。中冷器所用冷却水来自环境,吸收热量后又回到环境。选用余热锅炉型CC,HAT循环选用文献[3]提供的结构。2计算结果及分析计算条件:(a)环境温度20”C,压力0.101325MPa,湿度sg/bgDA;(b)压气机绝热效率0.88,燃气透平相对内效率0.9,蒸汽透平相对内效… 相似文献
6.
可再生能源装机容量的大幅增长对电网的供需平衡带来极大的挑战,燃煤发电由主体能源向基础能源转变,在消纳可再生能源发电和维持电网供需平衡中发挥着不可替代的作用。本文采用GSE软件搭建了650?C一次再热燃煤发电机组(汽轮机采用高低位分轴布置)的动态模型,研究了四种抽汽节流方案对燃煤发电机组主要热力参数和输出功率的动态特性。结果表明:采用高加抽汽节流,主蒸汽、再热蒸汽主要热力参数变化量显著大于低加抽汽节流;四种方案中,输出功率最大变化量可达211.55 MW;采用高加抽汽节流方案,低位汽轮机组输出功率增大量可达130.15 MW,高位汽轮机组减少量可到156.23 MW;采用低加抽汽节流方案,低位汽轮机组输出功率增大量可达26.21 MW。 相似文献
7.
8.
9.
本文提出了中低温太阳热能品位间接提升的概念、方法和系统集成,其核心是热集成和热化学转换的有机结合。在所提出的太阳能和化石能源综合互补的化学回热循环系统(SOLRGT)中,中低温太阳热能首先提供蒸汽蒸发潜热从而转化为蒸汽内能;其次通过蒸汽参与重整反应进一步转化为合成气化学能,实现品位提升;最后得以在高效的燃气轮机系统中实现热功转换。由于太阳能的引入,燃气轮机透平排气余热回收部分的热匹配得到极大改善,并减少了化石能源消耗;同时,蒸汽产率的增加有助于增进系统化学回热和物理回热收益。系统中太阳能热转功净效率可达26.5%;和常规化学回热循环相比,化石能源节约率可达20%~30%,实现相应数量的CO_2减排,系统中实现了中低温太阳能的高效热功转换和与化石燃料的梯级互补。 相似文献
10.
《工程热物理学报》2020,(6)
为了提高太阳能热发电站的发电效率,提出了耦合空气轮机、汽轮机及热力塔为一体的太阳能发电系统。在该系统中,吸热器吸收的太阳能加热压气机所压缩的高压空气,多余的热量被储存在储热装置中以在无阳光的时候维持电站正常运转。被加热后的高压空气驱动透平后排入余热锅炉产生蒸汽驱动汽轮机,余热锅炉的排气以及冷却汽轮机凝汽器的空气进入热力塔底部驱动风力涡轮。本文建立了该系统的热力学模型并对系统效率作了计算,计算中对水蒸汽动力循环的参数做了优化。计算结果表明,该系统相比传统的太阳能热电站发电效率明显提高,在环境温度为15℃、空气轮机组透平进口温度为700℃、热力塔高度400 m以上时,空气轮机工作在有回热热效率高的工作模式下,系统循环效率超过了50%,该太阳能电站总的能量转换效率将可达到33%。 相似文献
11.
Modern thermal power plants are complex technological systems. Therefore, making informed decisions when studying them requires the use of mathematical modeling and nonlinear optimization methods for plant parameter. The most complex task is to solve a mixed optimization problem wherein a part of optimization parameters vary continuously, and the other can take only discrete (integer) values. An effective method is developed to solve a thermal power plant optimization problem with continuous and discrete parameters. The method suggests an iterative procedure for solving continuous nonlinear programming problems and discrete-continuous linear programming problems. For each iteration, we add new constraints obtained by linearizing nonlinear inequality constraints and the objective function of the initial problem to the system of inequality constraints of linear problem. The effectiveness of the proposed method is exemplified by the optimization of a combined cycle power plant with a mixture of working media (the STIG scheme). Design characteristics of heating surface of a waste heat recovery boiler represent the discrete parameters to be optimized. The research demonstrates a considerable reduction in computational effort compared to the branch and bound method. 相似文献
12.
13.
L. Schnatbaum 《The European physical journal. Special topics》2009,176(1):127-140
The solar thermal power plant technology, the opportunities it presents and the developments in the market are outlined. The
focus is on the technology of parabolic trough power plants, a proven technology for solar power generation on a large scale.
In a parabolic trough power plant, trough-shaped mirrors concentrate the solar irradiation onto a pipe in the focal line of
the collector. The thermal energy thus generated is used for electricity generation in a steam turbine. Parabolic trough plants
can be combined with thermal storage and fossil or biomass fired heat exchangers to generate electricity even when the sun
is not shining. Solar Millennium AG in Erlangen has developed the first power plant of this kind in Europe. After two years
of construction the plant started operation in Southern Spain in 2008. This one and its sister projects are important steps
leading the way for the whole market. The paper also covers the technological challenges, the key components used and the
research and development activities concerning this technology. Solar thermal power plants are ideal for covering peak and
medium loads in power grids. In hybrid operation they can also cover baseload. The Solar Chimney power plant, another striking
technology for the conversion of solar into electric energy, is described briefly. The paper concludes with a look at the
future – the import of solar energy from the deserts of North Africa to central Europe. 相似文献
14.
15.
16.
The paper describes the developed method for analyzing technological schemes of thermal power plants based on solving problems of auxiliary linear programming. This method involves solving the linear programming problems to evaluate the effect of supply and removal of heat or material flows of various sizes at different points of the technological scheme of a thermal power plant (TPP). The method effectiveness is demonstrated by the example of the coaldust steam turbine unit with nominal electrical output of 660 MW. As a result of its application, the change of the technological scheme of the unit was found to provide reduction in electricity cost by 0.3%. 相似文献
17.
18.
A new approach has been developed to solve the optimization problems of continuous parameters of thermal power plants. It is based on such organization of optimization, in which the solution of the system of equations describing thermal power plant, is achieved only at the endpoint of the optimization process. By the example of optimizing the parameters of a coal power unit for ultra-supercritical steam parameters, the efficiency of the proposed approach is demonstrated and compared with the previously used one, in which the system of equations was solved at each iteration of the optimization process. 相似文献
19.
对不良导体导热系数测量原理的修正 总被引:11,自引:0,他引:11
对稳态法测量原理进行了较深入的探讨,指出了用稳态法测定非金属材料导热系数的不足之处,并作了一定的修正,从而推出了计算导热系数的新公式。通过测定结果,验证了修正后的导热系数计算公式的正确性和合理性。 相似文献