Ultra-supercritical power generation, what is the "super power"?

On July 23, 2010, China established the "National 700℃ ultra-supercritical Coal Power Generation Technology Innovation Alliance" in Beijing. According to the difficulties of 700℃ efficient ultra-supercritical power generation technology, China preliminarily determined that the 700℃ plan demonstration unit capacity is 600 MW class, the pressure and temperature parameters are 35 mpa /700℃/720℃, the unit is compact layout, and the preliminary research and development progress is made. It was originally planned to establish a demonstration power station of 660 MW and 35 mpa /700 ° C /720 ° C at the end of the "Twelfth Five-Year Plan", but due to the influence of the development of high-temperature materials, the project progress is also delayed.

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Solve the problem of low load and high energy consumption of thermal power units

In 2021, China proposed the "double carbon goal" of "carbon peak" and "carbon neutrality". Peak carbon refers to China's commitment to no longer increase carbon dioxide emissions before 2030, after reaching the peak gradually reduce; Carbon neutrality means that by 2060, China will achieve a balance between carbon dioxide emissions and elimination.

By the end of 2021, the total installed capacity of wind power and solar power in China has reached 635 million kilowatts, and the new energy power represented by wind power and photovoltaic power generation has developed rapidly, and is expected to reach more than 1.2 billion kilowatts in 2030. The basic power supply with thermal power as the main body will gradually enter the new normal of peak operation.

However, based on the common sense of thermodynamics, the steam flow of conventional thermal power units during peak load balancing under low load conditions drops significantly, resulting in an approximate linear drop in steam pressure at the turbine unit inlet, which directly leads to a significant increase in energy consumption of the unit during peak load balancing (low load conditions are similar to large horse-driven cars).

For example, when the conventional ultra-supercritical thermal power unit depth peaking to 30% of the rated load is operated, it directly leads to the unit parameters being reduced to a supercritical or even subcritical state, and the energy consumption is significantly increased by more than 10% (35-40 grams per KWH).

Compared with the advanced 700℃ ultra-supercritical power generation technology, the problem of low load and high energy consumption of thermal power units has become a more important problem to be solved for the further development of ultra-supercritical power generation technology.

Under the strong support of various departments of the state, under the comprehensive guidance of Academician Ni Weidou and Academician Yue Guangxi, Tsinghua University, Jinan University and other units to carry out joint research, after more than 10 years of efforts, broke through the thermal power industry for more than 100 years of "low-load unit power supply coal consumption will rise significantly" traditional cognition, through the modular design of the thermal system, The system flow structure can be adjusted under medium and low load conditions to realize full load efficient operation of thermal power units. They are actively developing full load efficient operation technology of thermal power unit peak regulation process with independent intellectual property rights, which is expected to comprehensively reduce the power supply coal consumption under low load conditions during thermal power unit peak regulation process, and realize the leap from "made in China" to "created in China".