Study on the distribution of carbon emission intensity from coal-fired industrial boilers in China and its influencing factors
The boiler is a major energy consumer and an important source of atmospheric pollutants and carbon emissions in China.Accurately quantifying carbon emissions from boilers is the basis for understanding the overall carbon footprint of the country.A method for carbon emission quantification that combines energy efficiency testing with carbon oxidation rate calculations and flue gas CO2 emission tests were proposed.Furthermore,it introduced heat load to establish a methodology for calculating carbon emission intensity.The proposed carbon emission intensity calculation method was validated based on a dataset of 615 real-world tests conducted on coal-fired industrial boilers.The study also analyzed the overall distribution pattern of carbon emission intensity among these boilers.The majority of coal-fired industrial boilers had a carbon emission intensity ranging between 80～140 kgCO2/GJ,with the maximum value recorded at 137.4 kgCO2/GJ and the minimum at 82.5 kgCO2/GJ,while the average stands at 110.8 kgCO2/GJ.The research further delves into the impact of factors such as carbon content per unit of heat value,carbon oxidation rate,thermal efficiency,boiler capacity,and operating load on the distribution of carbon emission intensity.The results indicated that the carbon emission intensity of boilers was significantly influenced by the carbon content per unit calorific value,exhibiting a distinct positive correlation.Anthracite exhibited a higher carbon emission intensity compared to bituminous coal and lignite.As boiler thermal efficiency increased,the carbon emission intensity generally showed a downward trend.Taking a layer-combustion boiler with the capacity of 40t/h as an example,sensitivity analysis was conducted.The influence of the exhaust flue gas temperature,oxygen content in flue gas and inlet air temperature on the carbon emission intensity is significant,while the influence of carbon content in slag and fly ash is relatively small.When the exhaust flue gas temperature increases by 10℃,the carbon emission intensity rises by 0.59 kgCO2/GJ.Upon an increase of 1%in the oxygen content in flue gas,the carbon emission intensity increases by 0.50 kgCO2/GJ.
万方数据
维普
