Solar power, including concentrated solar power (CSP) and photovoltaic (PV), is promoted around the world. However, power generated by PV is intermittent, while CSP is not cost-effective. Solar-aided coal-fired power plant (SCPP) is considered as an efficient and economical solution which couples concentrated solar collector with coal-fired power plant (CFPP) by sharing the turbine systems. Besides, SCPP can reduce the coal consumption of CFPP and realize multi-energy complementary. Due to the fluctuations of power load and solar energy, SCPP is often operated in dynamic processes. This paper focuses on exploring the dynamic characteristics of a SCPP integrated with though solar collector system (TSCS) under various fluctuations of power load and solar energy. The SCPP investigated in this paper is based on a 660MW CFPP, and the TSCS is connected in parallel with high-pressure heaters (HPHs). First of all, the SCPP models, including the CFPP model, the model of the trough solar collector and the model of oil water heat exchanger, were developed and validated. Then, the dynamic characteristics of the SCPP were investigated under 100%, 80% and 60% power load conditions, respectively. Taking the replacement of 80% feedwater flowing into all three stages of HPHs by TSCS as an example, the key performance parameters including the output power response of SCPP, the dynamic output performance of TSCS and the dynamic duration time were analyzed with the same step variation of direct normal irradiance (DNI). After that, such parameters were compared with different power loads. In addition, similar tests that using TSCS to replace different stages of HPHs in parallel were compared. Results revealed that with the same step increment of DNI (300W/m^2^), under different power load conditions, the dynamic processes showed similar changing tendency but the amplitudes of variations were different. In detail, the output power increased by about 1.7MW, 1.55MW and 1.42MW within 1500s, 2200s and 2750s under 100%, 80% and 60% power load conditions, respectively. Meanwhile, the dynamic duration time of the output feedwater temperature increased with the decrease of power load. Moreover, under the same power load condition, both increments of output power and dynamic duration time became larger as the rise of the energy degree replaced by TSCS. This paper aims to guide the design and optimization of the SCPP control under different load conditions.


Dynamic Simulation of Coal-Fired Power Plant Integrated With Trough Solar Collector Operating in Parallel With High Pressure Heaters

Division / Sponsors: 
Power Division & Nuclear Engineering Division (NED)

Power Conference
Paper Proceedings: https://asmedigitalcollection.asme.org/POWER/POWER2020/volume/83747

International Conference on Nuclear Engineering
Paper Proceedings: https://asmedigitalcollection.asme.org/ICONE/ICONE2020/volume/83761

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