扩容蒸发式光煤互补发电系统变辐照特性研究

doi:10.11930/j.issn.1004-9649.201804054

中国电力 ›› 2019, Vol. 52 ›› Issue (2): 149-157.DOI: 10.11930/j.issn.1004-9649.201804054

扩容蒸发式光煤互补发电系统变辐照特性研究

冯蕾

神华国华(北京)电力研究院有限公司, 北京 100025

收稿日期:2018-04-16 修回日期:2018-09-28 出版日期:2019-02-05 发布日期:2019-03-27
作者简介:冯蕾(1984-),女,博士后,从事光资源分析及光热太阳能发电技术研究,E-mai:fenglei_ei_dongli@163.com
基金资助:
国华电力公司科技项目（太阳能光热系统与火力发电相耦合的可行性研究）。

Study on Thermodynamic Performance of Volume Expanding Evaporative Solar System Hybrid with Coal Fired Power Generation System under Varying Radiations

FENG Lei

Shenhua Guohua (Beijing) Electric Power Research Institute Co., Ltd., Beijing 100025, China

Received:2018-04-16 Revised:2018-09-28 Online:2019-02-05 Published:2019-03-27

摘要/Abstract

摘要： 为避免槽式太阳能集热器内变热流量传热和汽液非均匀分布产生，提出了扩容蒸发式太阳能蒸汽发生系统。采用NASA SSE6.0数据库收集的辐照数据，将扩容蒸发式太阳能直接蒸汽发生系统与燃煤机组互补组成复合发电系统，建立复合发电系统的变工况计算模型，并以600 MW机组为例进行了复合发电系统变辐照情况下的日、月、年热力性能分析。研究结果显示：复合发电系统日发电功率与辐照强度曲线变化趋势类似，各月复合发电系统的发电量呈现出夏季较高的趋势，6月份达到峰值2.95×10⁸ kW·h，集热场效率与其趋势相反，机组热功转换率夏季较高，全年为32%~35%；太阳能平均热功转换效率为22.5%，研究结果可为太阳能与燃煤机组互补发电系统的工程应用提供新的方向和思路。

关键词: 扩容蒸发式太阳能蒸汽发生系统, 复合发电系统, 变辐照, 热力特性

Abstract: To avoid heat flux variations and non-uniform vapor-liquid distribution in parabolic collectors, the volume expanding evaporative solar steam generation system is proposed. Using actual solar radiation data from NASA SSE6.0 database, a 600 MW coal-fired power plant hybrid with a volume expanding evaporative steam generation system was established. Turbine stages at off-design condition were calculated with DNI data over a one-year period. And the daily, monthly and yearly thermodynamic performance of the hybrid system in Lhasa area was analyzed respectively. The results exhibit the same trends in steam mass flow, daily power generation and DNI with the monthly power generation reaching the maximum in June (2.95×10⁸ kW·h of electric energy produced), while the solar collector efficiency shows the opposite tendency. Moreover, the cycle thermal efficiency of power generation is relatively higher in summer, which typically ranges from 32% to 35% throughout the whole year. Annual solar thermal efficiency is approximately 22.5% by average. The results may provide a novel direction toward the application of solar energy system hybrid with coal-fired power generation.

Key words: VEESG, hybrid power generation, varying irradiation, thermodynamic performance

中图分类号:

TK513

冯蕾. 扩容蒸发式光煤互补发电系统变辐照特性研究[J]. 中国电力, 2019, 52(2): 149-157.

FENG Lei. Study on Thermodynamic Performance of Volume Expanding Evaporative Solar System Hybrid with Coal Fired Power Generation System under Varying Radiations[J]. Electric Power, 2019, 52(2): 149-157.

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扩容蒸发式光煤互补发电系统变辐照特性研究

Study on Thermodynamic Performance of Volume Expanding Evaporative Solar System Hybrid with Coal Fired Power Generation System under Varying Radiations

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