Study on the Characteristics of Carbon Dioxide Emission for a Unit under Different Running Conditions

摘要

The effects of coal property, boiler load and air distribution mode on the carbon dioxide emissions were studied to analyze the main factors influencing the carbon dioxide emissions from coal-fired power plants. A 100MW unit was selected for the study. The calculation results indicate that the volatile matter content and calorific value of coal do have great effect on the emission of CO_2. Besides, the CO2 emissions, gradually increasing with the air-coal ratio added under the 20%-50% and 50%-100% loads, raises along with secondary air temperature increasing in the two loads period. Especially, there would be a trend when the unit at the low loads that the amount of CO_2 increases at first and then decreases with the secondary air temperature raising, which to guide for the prediction and optimization of CO_2 emissions in coal-fired power plants.