Carbon emission performance calculation and impact analysis of gas-steam combined cycle
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.
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NSTL
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