Carbon reduction and techno-economic analysis of using green hydrogen in chemical and petrochemical industry
The low-carbon transformation of the petrochemical and chemical industries can be promoted by replacing hydrogen(i.e.,gray hydrogen)made from fossil fuels such as coal and natural gas by hydrogen(i.e.,green hydrogen)made from electrolysis of water using renewable energy power as petrochemical and chemical raw materials.Although the current cost of green hydrogen is higher,under the combined influence of decreasing electricity price,continuous increase of fossil energy price and carbon tax and carbon trading,the economy of green hydrogen will have the advantage of competing with gray hydrogen.Taking the three sub-sectors with the highest hydrogen consumption and carbon emission in the petrochemical and chemical industries as representatives,namely ammonia,synthetic methanol,and crude oil processing,this paper firstly introduces the process characteristics and development trends of hydrogen participation in petrochemical and chemical processes,including traditional and emerging processes,such as electrochemical ammonia synthesis,carbon dioxide hydrogenation to methanol,and bio-oil hydrodeoxygenation;then,the carbon emission of the petrochemical and chemical industries is summarized,focusing on the carbon emission intensity of ammonia,methanol,and refined diesel;finally,the carbon reduction economics of green hydrogen replacing current fossil fuel hydrogen production and industrial by-product hydrogen is analyzed.The results show that green hydrogen has an economically feasible cost of 14CNY/kg H2 to replace coal hydrogen when the carbon trading price is 100CNY/t.
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