Power generated through coal combustion is the dominant energy in China

the carbon dioxide(CO_2)emission during this process has accounted for an important proportion in the whole society. In order to achieve the goal of carbon emission peak and carbon neutralization and continuously reduce the carbon emission intensity

it is urgent to master the influencing factors of carbon emission intensity of existing coal-fired power units. Typical coalfired power units from four large scale coal-fired power bases in north Shaanxi

east Ningxia

Zhundong and Hami were selected to investigate the relationship between CO_2 emission intensity and unit type

operating load

coal quality

air cooling mode and other factors. The results show that

the CO_2 emission intensity of units with high parameter and large capacity is relatively low

and that of the direct air cooling units is relatively high. As the unit load decreases

the CO_2 emission intensity increases. The carbon content per unit calorific value

carbon oxidation rate

sulfur content and volatile matter of coal will affect the CO_2 emission intensity

while the effects of smoke exhausting mode and ambient temperature can be ignored. The research results can provide a guidance for engineers to design or reconstruct the green and low-carbon power plants

a path for power generation groups to strengthen carbon emission management and reduce carbon emission intensity

and a reference for power dispatching departments to optimize the load arrangement.