To improve the accuracy of carbon emission accounting and make the effect of carbon emission reduction more intuitive

it is proposed to associate power plant generation with carbon emission intensity. Firstly

the carbon emission performance of the gas-steam combined cycle unit is calculated based on Aspen Plus. Then

the carbon emission performance is analyzed from the aspects of four influencing factors: unit load

environmental temperature

heat network input and natural gas composition. The results show that

the established Aspen Plus model can simulate the operation of the power plant accurately. Taking the S106FA multi-axis gas-steam combined cycle unit of a power plant as an example

the calculated carbon emission performance is 342.66 g/(kW·h). The carbon emission is calculated by comparing the measured method and the emission factor method. The carbon emission performance accounting is closer to the measured method

and the deviation between the carbon emission performance method and the measured method is 0.20%. The deviation between the measured method and the emission factor method applying the measured low calorific value and the saved and deficient low calorific value are 5.24% and 19.66%

respectively. Unit load has the most obvious effect on carbon emission performance of the combined cycle unit

followed by heat network input

ambient temperature and natural gas composition. To reduce the carbon emission performance of the combined cycle unit

the power plant needs to arrange the peak regulation time and heat network heating reasonably

and using renewable energy as an alternative or supplementary fuel can be considered.