Carbon Dioxide Emission Reduction From Industrial Symbiosis Between Cement And Coal-fired Power Industries In China

For a long time,the CO₂ emission reduction brought by the industrial symbiosis between cement and coal-fired power industry was either a case study at micro scale or a general research which based on statistical data at macro scale.China's implementation of the emission permitting system in 2017 enabled us to achieve more accurately estimation of the CO₂ emission reductions effect at regional and even national scales based on the corporate level data and portray the details of industrial symbiosis networks.According to the carbon emission calculation system provided by IPCC and CSI,this study constructed a CO₂ emission calculation framework which suit for China's cement industry,providing the calculation methods for process emissions,fuel combustion emissions,indirect emissions,et al.Based on the case study of Guangdong Province,a bottom-up approach was adopted to calculate the CO₂ emission factors and emissions of the cement industry in Guangdong Province in 2014.The results showed that the majority?96.1%?of CO₂ emissions were produced during the clinker production process.And the average usage of 2.7%fly ash resulted in 3.4%CO₂ emission reduction,which reflect the considerable CO₂ emission reductions effect brought by the industrial symbiosis.Based on the idea of optimization,the research proposed an industrial symbiosis network models which use statistical data from open source to simulate the actual situation of industrial symbiosis.By establishing the objective function and taking into account of three constraints?technology,economy and policy?,the actual situation of the industrial symbiosis between cement and coal-fired power industry was simulated.The study selected a case on verifiable scale?taking Xinxiang City as the case?to verify the effectiveness of the method.The results showed that there is a widespread industrial symbiosis between the cement and power industries in Xinxiang City.The comparison between statistical data and field survey data showed that the statistical data from open source can effectively reflect the actual material input and output of the enterprise and the simulation accuracy of the model was as high as 92.6%,which verified the effectiveness of the method.Based on the above CO₂ emission calculation method and industrial symbiosis network model,this study calculated the CO₂ emission reduction through industrial symbiosis and its potential between the cement and coal-fired power industry on a national scale.The results showed that under the base scenario,the utilization of fly ash in the cement industry in China is 170.25 million tons,and the average addition ratio is7.1%.The emission reduction through the industrial symbiosis was 144.85 million tons,which was 8.6%of the total emission.Two future possible scenarios were set up for the study.Under the policy incentive scenario and the best practice scenario,the utilization of fly ash reached 318.84 million tons and 740.02 million tons,respectively.The additional emission reduction potential reached 173.89 million tons and 484.77 million tons,respectively,with an increase of 120.0%and 334.7%compared with the base scenario,respectively.The results indicated that there was still a huge potential for CO₂emission reduction between the cement and coal power through industrial symbiosis.In the future,it is necessary to launch a series of promotion and incentive policies to encourage the above-mentioned industries to generate symbiosis,thereby enhancing the competitiveness of the above two industries and enhancing their environmental performance at the same time.