塔式太阳能与燃煤互补发电系统热性能分析与优化
发布时间：2018-11-27 09:53
【摘要】：将塔式太阳能与燃煤电站互补发电,不仅能够降低塔式太阳能热发电的技术和经济风险[1,2],而且能够降低太阳能发电成本,减少排放,促进可持续发展。本文对塔式太阳能与燃煤互补发电系统热性能和经济性能作了相关研究,主要的研究成果与创新点概述如下:1)利用“锥体光学法”建立了塔式定日镜场光学模型,基于放射状栅格法建立了定日镜场布置与优化模型,并据此编写了计算机模拟程序,此程序可以用于定日镜场的设计计算及优化;2)研究了不同吸热器表面净吸收能流密度条件下,吸热器入口空气流速和吸热器表面积的取值范围,为互补系统设计和运行提供了理论支撑;3)建立了塔式太阳能与燃煤互补发电系统的热力学及经济学模型,并对2种不同的烟气热量利用方案进行对比分析,结果表明,利用烟气加热给水以取代部分或全部2级高加抽汽为最优方案;4)研究了吸热器表面净吸收能流密度和烟-水换热器换热面积对互补系统热性能的影响,并对互补系统的年性能和经济性作了研究和分析,结果表明,当烟-水换热器换热面积为省煤器换热面积的6倍时,平准化太阳能发电成本最低(0.1256$/k Wh),远低于单纯太阳能电站的平准化太阳能发电成本(0.1787$/k Wh)[3],与原燃煤机组相比,此时互补系统的的煤耗率下降了56.9 g/k Wh,年节煤量达到5.2x104 t。
[Abstract]:The complementary generation of tower solar energy and coal-fired power plant can not only reduce the technical and economic risk of tower solar thermal power generation, but also reduce the cost of solar power generation, reduce emissions and promote sustainable development. In this paper, the thermal performance and economic performance of the tower solar and coal-fired complementary power generation system are studied. The main research results and innovations are summarized as follows: 1) the optical model of the tower sun-fixed mirror field is established by using the "pyramidal optics method". Based on the radial grid method, the model of the helioscope field layout and optimization is established, and a computer simulation program is compiled, which can be used for the design calculation and optimization of the helioscope field. 2) the range of the inlet air velocity and the surface area of the absorber is studied under the condition of different absorber surface net absorption energy flow density, which provides the theoretical support for the design and operation of the complementary system. 3) the thermodynamic and economic models of tower solar and coal-fired complementary power generation system are established, and two different schemes of flue gas heat utilization are compared and analyzed. The results show that, The optimal scheme is to use flue gas to heat the feed water to replace some or all of the two-stage high steam extraction. 4) the effects of the net absorption energy flow density on the surface of the absorber and the heat transfer area of the flue-water heat exchanger on the thermal performance of the complementary system are studied, and the annual performance and economy of the complementary system are studied and analyzed. When the heat transfer area of smoke-water heat exchanger is 6 times of that of economizer, the cost of equalized solar power generation is the lowest (0.1256 Wh), / k Wh),). Compared with the original coal-fired units, the coal consumption rate of the complementary system is reduced by 56.9 g / k Wh, per year to 5.2x104 t, which is much lower than that of the pure solar power plants (0.1787 g / k Wh) [3], and compared with the original coal-fired units, the coal consumption rate of the complementary system is reduced by 56.9 g / k Wh, per year.
【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
本文编号：2360295
[Abstract]:The complementary generation of tower solar energy and coal-fired power plant can not only reduce the technical and economic risk of tower solar thermal power generation, but also reduce the cost of solar power generation, reduce emissions and promote sustainable development. In this paper, the thermal performance and economic performance of the tower solar and coal-fired complementary power generation system are studied. The main research results and innovations are summarized as follows: 1) the optical model of the tower sun-fixed mirror field is established by using the "pyramidal optics method". Based on the radial grid method, the model of the helioscope field layout and optimization is established, and a computer simulation program is compiled, which can be used for the design calculation and optimization of the helioscope field. 2) the range of the inlet air velocity and the surface area of the absorber is studied under the condition of different absorber surface net absorption energy flow density, which provides the theoretical support for the design and operation of the complementary system. 3) the thermodynamic and economic models of tower solar and coal-fired complementary power generation system are established, and two different schemes of flue gas heat utilization are compared and analyzed. The results show that, The optimal scheme is to use flue gas to heat the feed water to replace some or all of the two-stage high steam extraction. 4) the effects of the net absorption energy flow density on the surface of the absorber and the heat transfer area of the flue-water heat exchanger on the thermal performance of the complementary system are studied, and the annual performance and economy of the complementary system are studied and analyzed. When the heat transfer area of smoke-water heat exchanger is 6 times of that of economizer, the cost of equalized solar power generation is the lowest (0.1256 Wh), / k Wh),). Compared with the original coal-fired units, the coal consumption rate of the complementary system is reduced by 56.9 g / k Wh, per year to 5.2x104 t, which is much lower than that of the pure solar power plants (0.1787 g / k Wh) [3], and compared with the original coal-fired units, the coal consumption rate of the complementary system is reduced by 56.9 g / k Wh, per year.
【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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