摘要
为了研究燃煤电厂汞的脱除特性及迁移规律,采用美国EPA推荐使用的OHM标准方法测试了不同燃煤电厂煤粉炉排放烟气中汞的形态及质量浓度,分析了主要烟气净化设施对汞排放的影响。结果表明,SCR系统催化剂可将部分Hg^0催化氧化成Hg^(2+),促进了汞在飞灰上的吸附和在WFGD系统内的吸收,ESP系统和WFGD系统对汞脱除起主要作用,脱除效率合计超过60%,WESP系统对烟气中汞的脱除效果有限;煤中灰分含量能够影响颗粒汞与气态汞之间的比例;烟气中SO_2浓度会对Hg^(2+)的吸收产生抑制作用,造成Hg^0的重新排放;炉渣对汞的富集能力有限,电场灰和石膏对汞具有很强的富集作用,且飞灰的粒径越小,对汞的吸附能力越强。
In order to study the characteristics of mercury distribution and migration,EPA OHM method was used to determine the Hg concentrations in flue gases emitted from two typical pulverized coal-fired boilers.Then the effect of major flue gas purification systems on Hg emission was clarified.Experimental results indicate that Hg0 will be catalytic oxidation into Hg2＋in SCR system that promotes the mercury be absorbed by fly ash and desulfurization slurry in WFGD system.ESP system and WFGD system plays the leading role foe mercury removal which the total removal efficiency reach more than 60% and WESP system has only limited removal effect.Ash content of coal particles can affect the ratio of granular mercury between the gaseous mercury. The absorption of Hg2＋will be inhibition by SO2,caused Hg0 emissions again,which affects mercury removal efficiency of WFGD system. In addition,most of the Hg is transferred into desulfurization gypsum and fly ash,and smaller particle size of fly ash has the stronger adsorption ability to mercury,while the enrichment ability of bottom slag is limited.
作者
车凯
李振海
韩忠阁
郁金星
陈崇明
CHE Kai;LI Zhenhai;HAN Zhongge;YU Jinxing;CHEN Chongming(State Grid Hebei Electric Power Research Institute, Shijiazhuang 050021, China)
出处
《洁净煤技术》
CAS
2018年第2期114-118,共5页
Clean Coal Technology
关键词
燃煤电厂
汞
迁移
煤种
排放
coal-fired power plant
Hg
migration patterns
coal
emissions
作者简介
车凯（1985-），男，河北石家庄人，工程师，硕士，主要从事电力环保工作。E-mail：chekai311@163．com
