Integrated Assessment Of Extended Exergy Accounting From Industrial Symbiosis In An Iron And Steel Industrial Network

The iron and steel industry shoulders the heavy responsibility of economic development and is also the main energy consumption and carbon dioxide emission sector.The development of the steel industry network,which is dominated by the steel industry,faces serious challenges of improving resource utilization efficiency and objectively quantifying the resource costs of actual production in industrial networks.This study is based on the steel industry network,from the perspective of thermodynamics,using exergy to quantify energy quality and identify system inefficiencies,while using extended exergy to objectively measure the socio-economic environment influences related to material consumption,labor and capital,and environmental emissions.This study takes the steel industry symbiosis network as a case study,by constructing the exergy balance of the system,using the exergy efficiency index to analyze the exergy loss of the network during energy conversion,which aim to quantify the potential of heat increase;and objectively measure the symbiosis of the steel industry.The resource cost of actual production in the network,comprehensive performance evaluation of the symbiosis network of the steel industry;and the assessment of the resource conservation and emission reduction effects of the network after the implementation of industrial symbiosis measures,analysis and discussion of the impact or benefit distribution of upstream and downstream enterprises that have undergone symbiotic exchange.The performance evaluation of the symbiotic network of the steel industry using the exergy efficiency index indicates that the pellet baking process needs to focus on the optimization and transformation of the waste heat recovery process.In addition,the total extended exergy content in the study park is 1.35 EJ,in which the environmental remediation exergy is the maximum exergy consumption,followed by the material-based exergy,capital exergy and labor exergy.In the industrial symbiosis network,the refractory plant has the greatest capacity,with a value of 233.67 RMB/GJ,indicating a high conversion capacity from exergy to currency.In terms of resource consumption,the concentrator consumes more exergy than the refractory plant.In terms of environmental remediation,concentrator plants have the lowest capacity,which indicates that in order to produce the same total industrial output value,concentrator plants will need to increase the cost of environmental remediation or more pollutants.In terms of the ratio of exergy consumption of materials to the equivalent exergy of social externalities,refractory plants use less equivalent exergy per unit of social externalities.The social exergy conversion rate of the overall research network reflects that the industry network consumes a large amount of materials.