塔式光煤互补系统热力性能研究

发布时间：2018-03-19 19:34

本文选题：热力性能　切入点：塔式太阳能　出处：《华北电力大学(北京)》2017年硕士论文　论文类型：学位论文

【摘要】：为了节约能源和保护环境,太阳能辅助燃煤发电系统得以迅速发展。本文针对敦煌地区660MW燃煤机组提出了一种塔式太阳能与常规燃煤电厂集成方案。基于仿真平台TRNSYS,建立了光煤互补系统模型。依据TRNSYS软件里的气象数据库,在煤炭节省型操作模式下,对互补系统在不同的辐照强度以及不同工况下进行了模拟分析,从而得到了典型日和典型年的热力性能,揭示了光煤互补系统的特点。最后,还对光岛规模进行了优化。结果表明,本文中的互补系统年光电转换效率最高可达16.97%,对于现有单一的太阳能热发电技术,由于光煤互补系统更加节约成本,因此具有显著的优势。本文提出以熔盐为塔式太阳能集热系统中间换热工质并同时加热过热蒸汽与再热蒸汽的新型集成方案,不仅利用塔式太阳能集热器提高了太阳能热的集热温度,采取过热、再热两段集成的方法可避免太阳能热引入燃煤机组后产生的波动影响汽轮机的正常运行。本文在太阳能热的高温利用方面相对传统的集成方式更具优势。本文旨在寻求改造现有燃煤电站的新途径,为改造燃煤电站提供一些理论参考。
[Abstract]:To save energy and protect the environment, Solar assisted coal-fired power generation system has developed rapidly. In this paper, an integrated scheme of tower solar energy and conventional coal-fired power plant is proposed for 660MW coal-fired units in Dunhuang area. Based on TRNSYS-based simulation platform, a photo-coal complementary system module is established. Based on the meteorological database in the TRNSYS software, In the coal saving operation mode, the complementary system is simulated and analyzed under different irradiation intensity and different working conditions, thus the thermodynamic performance of typical days and typical years is obtained, and the characteristics of the complementary system are revealed. The results show that the annual photoelectric conversion efficiency of the complementary system in this paper is up to 16.97. For the existing single solar thermal power generation technology, the cost of the photo-coal complementary system is more economical. In this paper, a new integrated scheme using molten salt as the intermediate heat transfer medium and heating superheated steam and reheat steam simultaneously is proposed. Not only has the tower solar collector been used to raise the collection temperature of solar heat, but also to overheat it. The method of two-stage integration of reheat can avoid the fluctuation of solar energy heat introduced into coal-fired units to affect the normal operation of steam turbines. This paper has more advantages than the traditional integration method in the utilization of solar heat at high temperature. Looking for new ways to transform existing coal-fired power plants, Some theoretical references are provided for the transformation of coal-fired power stations.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM61

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