湿法脱硫工艺对电厂烟气颗粒物排放的影响研究  

Study on the Effect of Wet Flue Gas Desulphurization （WFGD） Technology on Flue Gas Particle Emission from Power Plants

作　　者：李朋[1,2] 丁立萍[1] 李睿[3] 卢林[3] 康玺[1,2] 周卫青[1,2] 吴华成[1,2] 

机构地区：[1]华北电力科学研究院有限责任公司,北京100045 [2]国网冀北电力有限公司电力科学研究院,北京100045 [3]国家电网公司,北京100031

出　　处：《中国电力》2017年第9期105-110,184,共7页Electric Power

基　　金：国家电网公司科技资助项目（特高压跨区域输电对受端区域灰霾天气改善的影响研究）

摘　　要：为研究石灰石-石膏湿法脱硫（WFGD）工艺对烟气颗粒物排放的影响，对某电厂WFGD前后烟气中颗粒物浓度、粒径分布、形貌、元素组成及含量、物相结构等进行了采样及分析。研究结果表明，WFGD工艺对颗粒物有约51．07％的脱除效率．且对粒径较大的颗粒物脱除效果较为明显：在脱硫塔出口,烟气中粒径小于2．5μm的颗粒物浓度比脱硫前有所增加；脱硫后烟气颗粒物的聚集形态由脱硫前的链状结构变为团簇状结构，且团聚体的体积更小；脱硫后烟气颗粒物中Si、Al元素含量分别下降36．97％和51．15％，而Ca、Mg元素含量分别提高了4．67倍和8．64倍；脱硫装置出口烟气颗粒物中含有约11．59％的石灰石和23．56％的石膏．而燃煤飞灰占64．85％。To study the effect of wet flue gas desulphurization （WFGD） technology on the emission of flue gas, the flue gas before and after WFGD is sampled to analyze the concentration, particle size distribution, morphology, element composition and contents as well as phase structure of the flue gas particles in a power plant. The results show that the removal efficiency of WFGD on flue gas particles is about 51.07% with more significant effects on larger particles. At the desulphurization tower outlet, the concentration of particles has diameter less than 2.5 win is increased. After desulphurization, the aggregation morphology of the flue gas particles changes from chain structure to cluster structure while the aggregates get smaller. The content of Si and A1 elements in the flue ga~ particles are decreased by 36.97% and 51.15% respectively, while the content of Ca and Mg elements are increased by 4.67 and 8.64 times respectively after desulphurization. There are about 11.59% limestone and 23.56% gypsum matters in the particles at the outlet of WFGD system, and the content of coal fly ash is about 64.85%.

关 键 词：燃煤电厂 石灰石-石膏湿法脱硫 颗粒物 排放 脱除效率 颗粒成分 

分 类 号：X701.3[环境科学与工程—环境工程] TM628[电气工程—电力系统及自动化]