In order to understand the influence of various systems involved in coal burning process on carbon emission intensity of coal-fired power supply

a method is proposed to decompose the carbon emission intensity of coal-fired power supply into various systems. Namely

according to the coal carbon content and carbon oxidation rate

the CO_2 generation coefficient per unit standard coal consumption is calculated

then the net coal consumption rate is decomposed according to the energy utilization status of each system. Finally

the coal consumption corresponding to the energy loss of each system is converted into carbon decomposition intensity. Taking a 330 MW coal-fired unit as an example

the decomposition distribution of the carbon emission intensity of coal-fired power supply in each system and its variation rule with the working condition are obtained through decomposition under three stable working conditions of 58% load

74% load and 89% load. The results show that

the carbon emission intensity of coal-fired power supply is negatively correlated with the unit load. The systems that have great influence on the carbon emission intensity of coal-fired power supply are steam turbine system

auxiliary power system and boiler system. The carbon emission intensity of boiler system is mainly caused by heat loss of exhaust gas

heat loss and mechanical incomplete combustion loss.