以太阳能热辅助660 MW光煤互补发电系统为研究对象,建立光煤互补发电系统的动态仿真模型,针对6种典型的光煤互补发电系统运行方案,研究熔融盐储热及太阳能热引入对光煤互补发电系统动态响应规律的影响。结果表明：在满足机组安全运行的条件下,对比3种系统降负荷方案,抽主蒸汽-排汽进凝汽器方案的调峰容量和变负荷速率最大,分别可达56.5 MW和6.7%Pe/min（Pe为机组额定功率）;对比2种系统升负荷方案,熔融盐加热给水旁路方案的调峰容量最大,可达32.4 MW,熔融盐加热凝结水旁路方案的变负荷速率最大,可达8.45%Pe/min;对比3种不同太阳能热引入光煤互补发电系统方案下的标准煤耗率变化,其中采用熔融盐加热进入锅炉给水方案的节煤效果最好,标准煤耗率最多可减少25.47 g/kWh,且光煤互补发电系统发电功率越高,节煤量越大。
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%Pe/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%Pe/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.
关键词
太阳能 /
燃煤电厂 /
熔融盐 /
调峰 /
灵活性 /
动态仿真
Key words
solar energy /
coal fired power plant /
molten salt /
peak-regulation /
flexibility /
dynamic simulation
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基金
北京市自然科学基金（3222042）; 国家重点研发计划（2022YFB4202405）; 内蒙古自治区科技计划（2023YFHH0127）
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