A certain 5 000t/d cement clinker production line with problems such as poor heat exchange efficiency of preheater,high outlet temperature of C1 cyclone outlet,small calciner volume,high NOx emission,low heat recovery efficiency of cooler,and high energy consumption per unit product of clinker.It is a pilot project for carbon peak and carbon reduction technology transformation in the cement industry.The project applies an energy-saving and carbon reducing upgrade plan for the pyro system,and simultaneously optimizes and upgrades the raw material grinding system and cement grinding system.By adopting technological transformation measures such as expanding the volume of calciner,applying low-energy self-denitrification technology,upgrading the 5-stage preheater to 6-stage,expanding the kiln chamber,replacing the tertiary air duct,and apply a grate cooler with intermediate roller crusher and high-efficiency fans.The fuel consumption per unit product of clinker is lower than the national standard level 1 energy efficiency index,saving 3.5×104t of standard coal per year,reducing CO2 emissions by 7.7×104t,saving 0.3×104t of ammonia water consumption,and NOX emission concentration<50mg/Nm3,with significant energy-saving and carbon reduction effects.
关键词
烧成系统/能效提升/五级改六级/自脱硝技术/节能降碳
Key words
pyro system/energy efficiency improvement/upgrading the 5-stage preheater to 6-stage/self-denitrification technology/energy conservation and carbon reduction
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