Scenario Analysis Of Coal Chemical Industry Based On Carbon Metabolism And Eco-efficiency

Industrial processes consuming primary energy are critical economic sectors account for about 85% greenhouse gas emissions globally.The characteristics of high emissions and non-renewable resources reveal the necessity of energy saving and carbon emission reduction.This study established a framework based on ecological network analysis and eco-efficiency to identify the interaction between carbon sources and sinks and systematic environmental impact and economic value and applied it to typical new coal chemical industries.Based on the above results,three important scenarios are set up including carbon resource allocation adjustment,coke oven gas co-supply and coal gasification technology improvement to predict the potential of energy saving and carbon emission reduction of the new coal chemical industry.The results of research show that:(1)When creating the same production value,the life cycle energy consumption and carbon emissions of coal-to-natural gas and coal-to-olefin are much higher than those of coal-to-diesel and coal-to-ethylene glycol,and the coal conversion is the highest;Coal-to-diesel and coal-to-ethylene glycol can save 10%-20% of the cost,and its eco-efficiency is almost twice than that of coal-to-natural gas and coal-to-olefin.(2)Part of the carbon sources converted into carbon sinks and re-enter the metabolic system to improve energy efficiency owning the direct/indirect utility between carbon sources and sinks.Coal-to-ethylene glycol with higher Mutualism Index but lower carbon efficiency need be further concerned.The external environment,coal gasification and low-temperature methanol washing are the most active and leading carbon sources of the carbon metabolic system,which should be first target to mitigate discharge;the optimization and improvement of the spatial layout and weight of carbon sources and carbon sinks in the metabolic system which could be further clarifies with trophic structure analysis is an effective way to improve environmental performance.(3)Scenario analysis shows that co-supply of coke oven gas has the best potential for improving environmental performance.The optimal scenario(Scenario 4)defines the primary fossil energy saving and carbon emission reduction potential of the modern coal chemical industry.Under the two models of equal distribution and full distribution,the new coal chemical industry can save 41% and 37% of energy while reducing carbon emissions by 42% and 41%,respectively.Under the dual pressure of global climate change and environmental problems,our findings may provide a scientific foundation for the low-carbon development of coal chemical industry,and also provide a theoretical basis for the global deployment of carbon emission reduction strategies.