太阳能辅助燃煤电站运行优化研究

发布时间：2018-03-08 14:03

本文选题：太阳能　切入点：辅助燃煤电站　出处：《华北电力大学》2014年硕士论文　论文类型：学位论文

【摘要】：太阳能辅助燃煤发电系统是将太阳能热以不同方式与传统燃煤机组相集成的系统。就目前特定形式而言,采用槽式太阳能热发电系统辅助燃煤机组发电对太阳能热利用及传统燃煤机组节能是一种极为有效而合理的集成方式。为了深入研究集成系统的运行性能及优化方案,本文将借助研究中所建立的660MW太阳能辅助燃煤发电系统变工况性能分析模型加以模拟分析,其具体研究内容如下：本文利用已有660MW燃煤机组及槽式太阳能集热场数据,在前人研究基础之上,根据天文学、热力学及热经济学相关理论,对660MW太阳能辅助燃煤发电系统五种不同负荷工况(100%、85%、75%、50%及40%)分别进行了模型搭建。同时,本文还将太阳能贡献度评价方法引入了模型之中,使其具备了对系统太阳能部分所占贡献比例进行分析计算的能力。最后,通过应用Matlab软件及其自带的函数体系对研究中所搭建的一系列模型成功实现了对接,共同组成了一套完整的660MW太阳能辅助燃煤发电系统性能变工况性能分析模型。通过利用所搭建的集成系统模型,文中对四个典型日(3月14日、6月25日、9月23日及12月21日)中集成系统各关键参数及运行性能进行了模拟分析。此外,根据研究地区典型年太阳辐照数据及燃煤机组运行数据,文中还对集成系统设计值进行了初步选取,辐照设计值选为773W/m2,负荷设计值选为495MW(75%)。依据该设计值,文中对集成系统全年运行性能进行了模拟分析。研究发现,集成系统内太阳能贡献度并非随有效直射辐射(DNIeff)的增大而持续上升；不同负荷下,当集热场集热量(Qcollected)超出其所对应的最优集热量(Qcolopt)时,由于系统内太阳能侧(?)损比例的上升,太阳能贡献度呈现快速下降的趋势。基于此,文中提出了通过调节导热油流速以维持集热量处于最优值范围内,从而将太阳能贡献度维持在较高水平的运行优化方案。研究中选定某典型日午时为参考,将太阳有效直射辐射设定为由1-1150W/m2连续变化,并依此对五种负荷工况下的集成系统进行了模拟研究。结果表明,采用优化方案后,集成系统的运行性能得到了较好的提升。为进一步对集成系统运行优化前后的经济性进行分析,文中依据槽式太阳能集热场及660MW燃煤机组的各项经济性参数,建立了集成系统标准煤耗率函数及发电收益函数。通过利用所建立的函数,文中对四个典型日中,75%负荷下的集成系统采用运行优化方案前后的经济性进行了分析计算,结果表明,优化后的系统运行经济性明显优于优化前。
[Abstract]:Ssceg system is a system of solar heat in different ways with the traditional coal-fired unit integration. The specific form, the solar thermal power system of power assisted coal-fired units of solar and conventional coal-fired unit energy saving is a very effective and reasonable way of integration. In order to run performance and Optimization for in-depth study of the integrated system, the performance of variable working condition analysis model simulation and analysis using 660MW ssceg system established in the study, the main research contents are as follows:
Based on the existing 660MW coal-fired unit and solar trough collector field data, based on previous studies, according to the relevant theories of astronomy, thermodynamics and thermo economics, on five different load conditions 660MW ssceg system (100%, 85%, 75%, 50% and 40%) were built. At the same time, this paper also the solar contribution degree evaluation method is introduced into the model, with the analysis and calculation of the proportion of the contribution ability of solar system. Finally, through the application of Matlab software and its function system comes with a series of model building studies successfully docking, compose a set of properties of 660MW solar aided coal-fired power system complete off-design performance analysis model.
By using the built model of integrated system, four typical day (March 14th, June 25th, in the September 23rd and December 21st) of the key parameters and operation performance of integrated system was simulated and analyzed. In addition, according to the research area of typical year solar radiation data and coal machine group operation data, the integrated value system design the preliminary selection, radiation design value is 773W/m2, the load design value is 495MW (75%). According to the design value, the annual performance of the integrated system are simulated and analyzed.
The study found that integrated system is not effective with the contribution of solar direct radiation (DNIeff) increased while rising; under different load, when the collector field in heat (Qcollected) beyond the optimal set of the corresponding heat (Qcolopt), the solar system side (?) increased loss ratio, the solar contribution the degree of declining quickly. Based on this, proposed by adjusting the flow rate to maintain a set of heat conduction oil in the optimal range, which will be maintained in the solar contribution operation optimization scheme of the high level. In the study selected a typical day at noon for reference, the effective solar direct radiation set continuous change by 1-1150W/m2 then, a simulation study of five kinds of integrated system load conditions. The results show that the optimization scheme, the operation performance of integrated system has been well improved.
For the further economy before and after the operation optimization of integrated system is analyzed, based on the groove type solar thermal parameters of the economic field and 660MW coal-fired unit, established the integrated system of standard coal consumption rate of power function and revenue function. By using the function established by the four typical day, integrated system 75% load the economy before and after the operation optimization scheme was analyzed, the results show that the optimization of economy of system operation is obviously better than the optimized.

【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM621

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