混燃石油焦CFB锅炉汞排放特性研究  

Study of the Mercury Emission Characteristics of a CFB Boiler Burning Coal Blended With Petroleum Coke

作　　者：邓雨生[1] 崔健 郑文凯[1] 段伦博[2] DENG Yu-sheng;CUI Jian;ZHENG Wen-kai;DUAN Lun-boz(SINOPEC Maoming Petrochemical Subcompany, Maoming, China,Post Code ： 525000;Education Ministry Key Laboratory on Thermal Conversion of Energy Sources and Its Process Monitoring, Southeast University, Nanjing, China, Post Code ： 210096)

机构地区：[1]中国石化集团资产经营管理公司茂名石化分公司,广东茂名525000 [2]东南大学能源热转换及其过程测控教育部重点实验室,江苏南京210096

出　　处：《热能动力工程》2018年第4期76-82,共7页Journal of Engineering for Thermal Energy and Power

基　　金：国家重点研发计划(2016YFE0102500)~~

摘　　要：为研究烟煤与石油焦混燃的循环流化床锅炉汞的迁移排放特性,采用安大略法（OHM）对机组布袋除尘器（FF）前后和湿法脱硫装置（WFGD）后的烟气进行取样,并同时对入炉燃料、飞灰、脱硫浆液、清洗水、石膏和脱硫废水进行了取样并分析。通过汞的质量平衡核算得到了汞在燃煤副产物中的分配比例以及汞的迁移排放特性。结果表明：飞灰中排放的汞占总汞排放的62.31%,大约30.38%的汞排放到大气中。FF可以高效地脱除颗粒态汞,对总汞的脱除率可达67.36%。WFGD对可溶性的二价汞脱除性能较好,对总汞的脱除率达24.24%。单质汞的排放因子远大于氧化汞,说明电厂大气汞的排放主要以单质汞为主。To study the migration and emission characteristics of mercury from a CFB boiler burning coal blended with petroleum coke,the Ontario hydro method （OHM） was adopted to sample the flue gases be- fore and after the fabric filter （FF） and after the wet flue gas desulfurization （WFGD） device and at the meantime ,to sample and analyze the fuel going into the boiler, flying ashes, desulfurized slurry, washing water, gypsum and desulfurization waste water. Through calculating the mass balance of mercury, obtained were the proportion of mercury distributed in the by-products from combustion of coal and the migration and emission characteristics of mercury. It has been found that the amount of mercury discharged from fly- ing ashes will occupy 62.31% of the total mercury emissions and approximate 30.38% of mercury will be discharged to the atmosphere. FF can efficiently remove the particulate mercury, the removal rate of the to- tal mercury will reach 67.31%. The WFGD device will enjoy a relatively good removal performance of dissolvable Hg2＋ and the removal rate of the total mercury will reach 24.24%. The emission factor of the elementary mercury will be far more than that of mercury oxide,indicating that the mercury emissions to the atmosphere from power plants will be dominated by the elementary mercury.

关 键 词：汞 石油焦 循环流化床 迁移特性 排放因子 

分 类 号：X511[环境科学与工程—环境工程]