锂辉石焙烧过程中窑尾高温烟气净化处理装置的工程应用  

The engineering application of high-temperature flue gas purification treatment device at kiln tail during spodumene calcination process

作　　者：李仲恺 郑超 康彬 何劲松 LI Zhongkai;ZHENG Chao;KANG Bin;HE Jinsong(SCSDN Environmental Technology Co.,LTD,Chengdu 610041,Sichuan,China)

机构地区：[1]四川思达能环保科技有限公司,四川成都610041

出　　处：《四川冶金》2024年第4期81-86,共6页Sichuan Metallurgy

摘　　要：锂辉石焙烧转型过程中产生的窑尾烟气特性有:高温、夹带有价粉尘、含NOx及SOx等污染性气体。以某企业年产6万吨碳酸锂项目为例,研究锂辉石在焙烧转型过程中高温尾气中有价粉尘回收、热量回收及烟气净化处理的工程应用。采用金属膜除尘器回收有价粉尘,SCR技术脱硝,烘干机回收烟气热量,石灰石石膏法脱硫的综合处理工艺,取得很好的处理效果:金属膜收尘器回收有价粉尘约9,000 t/年,带来直接经济效益约2,700万元;高温烟气的热量回收,为企业节约2,196,000 Nm^(3)/年的燃气量,节约燃气费用约878.4万元/年,NOx的排放指标低于80 mg/Nm^(3),SOx的排放指标低于50 mg/Nm^(3),满足环保排放要求。该工艺不仅实现对烟气中NOx、SOx等污染气体进行净化,同时也实现烟气的有价粉尘的回收及热量回收,为企业实现最大经济效益,同时也为同行业提供相关参考依据。During the transformation of power pyrite roasting,the characteristics of kiln tail gas are:high tempera-ture,valuable dust,nitrogen oxides,sulfur dioxide and other polluting gases.Taking an annual output of 60,000 tons of lithium carbonate project of a enterprise in Sichuan as an example,Studying the engineering application of valuable dust,heat recovery and flue gas purification treatment in high-temperature tail gas during the transformation of the roasting kiln.The comprehensive treatment process of using metal film dust collector to recover valuable dust,SCR denitrification,and the recover of flue gas heat,limestone gypsum desulfurization,has achieved good treatment results.The metal film dust collector recovers about 9,000 tons of dust per year,bringing direct economic benefits of about 2,700,000 yuan.The heat recovery of high-temperature flue gas saves 219,600 Nm per year of natural gas consumption for enterprise,saving costs of about 8,784,000 yuan per year.The emission index of nitrogen oxides is less than 80 mg/Nm^(3),and the emission index of sulfur dioxide is less than 50 mg/Nm^(3),meeting the environmental protection emission requirements.This process not only achieves the purification of pollutants such as nitrogen oxides and sulfur dioxide in flue gas,but also recovers valuable dust and flue gas heat,achieving maximum economic benefits for enterprises and providing relevant reference basis for the same industry.

关 键 词：有价粉尘 热量回收 金属膜除尘器 SCR脱硝 脱硫 

分 类 号：X75[环境科学与工程—环境工程]