In order to explore and develop a new type of efficient and flexible coal-fired cogeneration unit

this study starts with the supercritical CO_2 Brayton cycle and develops a calculation program for a 300 MW coal-fired supercritical CO_2 cogeneration unit based on the FORTRAN platform. Through this program

the energy efficiency and peak regulation capacity of the unit are calculated and analyzed. The results show that under the design condition

the coal consumption of the unit is 140.5 g/(k W·h)

the heating coal consumption is 37.1 kg/GJ

and the energy utilization efficiency is as high as 90.2%. The lower the heating load

the more sensitive the coal consumption and energy utilization efficiency are affected by power supply load. Under any heating condition

the power supply load of the unit can be arbitrarily adjusted in the range of 0 to 100%. There is no limit on the minimum gas flow rate and the minimum stable combustion load of the boiler

and the thermal electricity is completely decoupled.