RESEARCH ON FLEXIBILITY IN LOAD VARIATIONS OF SOLAR HYBRID COAL POWER GENERATION SYSTEM WITH MOLTEN SALT THERMAL STORAGE

Yang Tengfei; Hou Hongjuan; Liu Peng; Zhou Zekai; Teng Yuhang; Jin Tao

doi:10.19912/j.0254-0096.tynxb.2024-1046

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (10) : 351-359. DOI: 10.19912/j.0254-0096.tynxb.2024-1046

RESEARCH ON FLEXIBILITY IN LOAD VARIATIONS OF SOLAR HYBRID COAL POWER GENERATION SYSTEM WITH MOLTEN SALT THERMAL STORAGE

Yang Tengfei, Hou Hongjuan, Liu Peng, Zhou Zekai, Teng Yuhang, Jin Tao

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Abstract

Taking the complementary power generation system of a 660 MW coal-fired unit assisted by solar thermal energy as the research object, a dynamic simulation model was established for the solar hybrid coal power generation system. Based on this, the impacts of the molten salt storage and solar energy integration on the dynamic response of the solar hybrid coal power generation system were discussed through 6 typical operational schemes. The results show that： under safe operating conditions, comparing the three load reduction schemes, the peaking capacity and load changing rate of solar hybrid coal power generations system are the largest under the operation condition of main steam being extracted and exhaust steam entering the condenser, which can reach 56.5 MW and 6.7%P_e/min respectively; comparing the two system load increase schemes, the molten salt heating feedwater bypass scheme demonstrates superior peaking capacity （up to 32.4 MW）, while the molten salt heating condensate bypass scheme exhibits a higher load changing rate （up to 8.45%P_e/min）. Comparing the change of standard coal consumption rate under three different solar heat introduction complementary system schemes, the use of molten salt heating boiler feedwater coal saving effect is the best, the standard coal consumption rate can be reduced by 25.47 g/kWh at most, and the higher generated power of solar hybrid coal power generation system, the greater the coal saving rate.

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solar energy / coal fired power plant / molten salt / peak-regulation / flexibility / dynamic simulation

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Yang Tengfei, Hou Hongjuan, Liu Peng, Zhou Zekai, Teng Yuhang, Jin Tao. RESEARCH ON FLEXIBILITY IN LOAD VARIATIONS OF SOLAR HYBRID COAL POWER GENERATION SYSTEM WITH MOLTEN SALT THERMAL STORAGE[J]. Acta Energiae Solaris Sinica. 2025, 46(10): 351-359 https://doi.org/10.19912/j.0254-0096.tynxb.2024-1046

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