大中型CSP蒸汽电厂双并联式汽轮机配置。30mw中型CSP-ORC电厂案例研究

O. F. Fihri, E. Bennouna, H. Darhmaoui, A. Mouaky
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引用次数: 0

摘要

本研究的重点是在聚光太阳能发电技术的电源模块水平上研究一种不同的新设计。集中式太阳能发电厂的设计可以受益于成熟的能量转换循环,特别是朗肯循环和有机朗肯循环,以及这些循环在可靠性和效率方面的先前发展。然而,必须指出,这种循环通常是为矿物燃料发电厂和(或)生物质、废热以及一般来说具有高度稳定性和连续性的热源而开发和建造的。太阳辐照呈现出在一天内以及在一年中高度变化的特殊性。这样做的结果是,由于长时间在部分负荷下运行,电力循环的平均效率较低,并且涡轮机启动和关闭的频率更高,特别是在不稳定的天气下,这可能会消耗有用时间,减少生产持续时间并影响系统的耐久性。因此,一种解决方案可能是并联使用多个小功率单元而不是单个大功率单元,并从小功率周期的满负荷或接近满负荷运行中获利,避免在非常低的负载下运行,甚至低于大周期的最小运行负载。当前工作的目标是确定1mwe CSP-ORC电厂的最有效的多个电源模块配置,并评估它们与单循环配置相比对电厂性能的影响。这个项目的目的是研究一种新配置的潜在应用,该配置具有两个涡轮机而不是一个在同一动力块上用于中型到大型商业发电厂,目的是研究工厂设计的可能改进,如果得到证实,可以应用于CSP行业的未来项目。为此,使用Ebsilon®专业软件开发了一个30兆瓦的发电厂,有三种不同的配置:第一个是按照常规设计设计的,只有一台额定功率为30兆瓦的涡轮机,第二个设计是在同一块中分别有两台额定功率为20兆瓦和10兆瓦的涡轮机,比例分别为工厂总产量的2/3和1/3。最后,采用与第二种设计具有相同额定功率的两台涡轮机的配置,使用熔盐进行3小时的间接热能储存。这两种不同的设计将通过Ebsilon的脚本Pascal语言进行编程,以对携带热量的流体的质量流进行特定的控制,以便以最优的方式进行引导和控制。这种控制是在研究了天气的变化和波动之后,主要是直接正常辐照度和环境温度,因为它们是高度影响CSP技术利用太阳能的参数。为了观察三种不同设计在一年中不同时间的表现,对绿色城市Benguerir全年的天气数据和每小时的发电量进行了模拟。模拟结果表明,双涡轮蓄热设计具有更高的优势,特别是在冬季,由于较小的涡轮接近满负荷发电,DNI值在一天内波动。本研究的重点是在聚光太阳能发电技术的电源模块水平上研究一种不同的新设计。集中式太阳能发电厂的设计可以受益于成熟的能量转换循环,特别是朗肯循环和有机朗肯循环,以及这些循环在可靠性和效率方面的先前发展。然而,必须指出,这种循环通常是为矿物燃料发电厂和(或)生物质、废热以及一般来说具有高度稳定性和连续性的热源而开发和建造的。太阳辐照呈现出在一天内以及在一年中高度变化的特殊性。这样做的结果是,由于长时间在部分负荷下运行,电力循环的平均效率较低,并且涡轮机启动和关闭的频率更高,特别是在不稳定的天气下,这可能会消耗有用时间,减少生产持续时间并影响系统的耐久性。因此,解决方案c…
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Dual parallel turbines configuration of medium and large scale CSP steam power plants. Case study of a 30-MW medium scale CSP-ORC power plant
This research focuses on investigating of a different and new design at the power block level for Concentrated solar power technology. Concentration solar power plants designs could profit from the maturity of power conversion cycle in particular Rankine and Organic Rankine cycles and previous developments on these cycles in terms or reliability and efficiency. It is however important to note that such cycles have generally been developed and built for fossil fuel power plants and/or biomass, waste heat and, in general, with heat sources of high stability and continuity. Solar irradiation presents the particularity of being highly variable during a single day and also throughout an entire year. The consequence of this is a lower average efficiency of the power cycle due to long time operation at partial load, and much more frequent turbine start-up and shut down particularly during unstable weather which may consume useful time, reduce production duration and affect systems durability. Hence, a solution could be the use of multiple small power units in parallel instead of a single larger one and profit from full or close to full load operation of a small power cycle avoiding the functioning at very low load or even below minimum operation load for larger cycles. The objective of the present work is then to identify the most efficient configurations of multiple power blocks for the case of a 1 MWe CSP-ORC plant and assess their impact on plant performance versus a single cycle configuration. This purpose of this project is to investigate the potential application of a new configuration featuring two turbines instead of one on the same power block for medium to large scale commercial power plants, aims at investigating possible improvements in the design of the plant which could be applied, if proven, to future projects in the CSP industry. For this purpose, a power plant of the order of 30-MW was developed using the software Ebsilon®professional in three different configurations: the first one has been designed in the conventional design with only one turbine rated 30 MW, the second design features two turbines in the same block respectively of 20-MW and 10-MW with a ratio of 2/3, and 1/3 of the total production of the plant. Finally, a configuration featuring two turbines of the same power rating as the second design with a 3-hours of indirect thermal energy storage using Molten Salts. The two different designs will be programmed though Ebsilon’s scripting Pascal language to have a specific control of the mass flow of the fluid that carries the heat, in order to be channeled and controlled in the most optimal way. This control comes after studying the changes and fluctuations of the weather, mainly the direct normal irradiance and the ambient temperature as they are the parameters that highly affect the harnessing of solar energy from CSP technology. A simulation of the weather data and the power production over hourly values of a full year in the green city of Benguerir is performed, in order to see the behavior of the three different designs over the different times of the year. The results of the simulation show a higher advantage of the design featuring two turbines with the thermal energy storage especially during days in the winter where the DNI values fluctuate during a single day as the smaller turbines are close to full load power production in the new design.This research focuses on investigating of a different and new design at the power block level for Concentrated solar power technology. Concentration solar power plants designs could profit from the maturity of power conversion cycle in particular Rankine and Organic Rankine cycles and previous developments on these cycles in terms or reliability and efficiency. It is however important to note that such cycles have generally been developed and built for fossil fuel power plants and/or biomass, waste heat and, in general, with heat sources of high stability and continuity. Solar irradiation presents the particularity of being highly variable during a single day and also throughout an entire year. The consequence of this is a lower average efficiency of the power cycle due to long time operation at partial load, and much more frequent turbine start-up and shut down particularly during unstable weather which may consume useful time, reduce production duration and affect systems durability. Hence, a solution c...
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