化工学报
化工學報
화공학보
JOURNAL OF CHEMICAL INDUSY AND ENGINEERING (CHINA)
2015年
3期
1163-1170
,共8页
赵志锋%杜谦%赵广播%高建民%董鹤鸣%曹阳%韩强%苏利鹏%苑鹏飞
趙誌鋒%杜謙%趙廣播%高建民%董鶴鳴%曹暘%韓彊%囌利鵬%苑鵬飛
조지봉%두겸%조엄파%고건민%동학명%조양%한강%소리붕%원붕비
PM2.5%煤粉炉%CFB%粒径分布%电袋复合式除尘器%显微结构%次量及痕量元素
PM2.5%煤粉爐%CFB%粒徑分佈%電袋複閤式除塵器%顯微結構%次量及痕量元素
PM2.5%매분로%CFB%립경분포%전대복합식제진기%현미결구%차량급흔량원소
PM2.5%pulverized coal boiler%CFB%particle size distribution%COHPAC%microstructure%minor and trace elements
采用稀释采样方法对一台220 MW煤粉炉(锅炉A)及一台300 MW的CFB锅炉(锅炉B)电袋复合式除尘器前后PM2.5进行现场采样。通过ELPI测定PM2.5的粒径分布;采用SEM分析PM2.5的显微结构;采用EDX及ICP-OES分别对分级PM2.5中次量及痕量元素含量进行了检测。结果表明,锅炉A和B除尘前后对应的PM2.5粒数及质量浓度分布均不同;锅炉A和B产生的PM2.5分别以较为光滑球形和不规则形状为主,锅炉A除尘后PM2.5呈表面粗糙球形,锅炉B除尘后PM2.5单颗粒形貌特征不变;锅炉A和锅炉B产生的PM2.5除尘前后在各粒径段中Si、Al、Fe、Ca和Mg含量基本一致,As、Cd和Se含量随着粒径的减小而增大;除尘后锅炉A产生PM2.5中As和Se含量增加,且在亚微米PM2.5中As和Se含量的增加更明显,锅炉B除尘后PM2.5中As和Se含量基本不变。
採用稀釋採樣方法對一檯220 MW煤粉爐(鍋爐A)及一檯300 MW的CFB鍋爐(鍋爐B)電袋複閤式除塵器前後PM2.5進行現場採樣。通過ELPI測定PM2.5的粒徑分佈;採用SEM分析PM2.5的顯微結構;採用EDX及ICP-OES分彆對分級PM2.5中次量及痕量元素含量進行瞭檢測。結果錶明,鍋爐A和B除塵前後對應的PM2.5粒數及質量濃度分佈均不同;鍋爐A和B產生的PM2.5分彆以較為光滑毬形和不規則形狀為主,鍋爐A除塵後PM2.5呈錶麵粗糙毬形,鍋爐B除塵後PM2.5單顆粒形貌特徵不變;鍋爐A和鍋爐B產生的PM2.5除塵前後在各粒徑段中Si、Al、Fe、Ca和Mg含量基本一緻,As、Cd和Se含量隨著粒徑的減小而增大;除塵後鍋爐A產生PM2.5中As和Se含量增加,且在亞微米PM2.5中As和Se含量的增加更明顯,鍋爐B除塵後PM2.5中As和Se含量基本不變。
채용희석채양방법대일태220 MW매분로(과로A)급일태300 MW적CFB과로(과로B)전대복합식제진기전후PM2.5진행현장채양。통과ELPI측정PM2.5적립경분포;채용SEM분석PM2.5적현미결구;채용EDX급ICP-OES분별대분급PM2.5중차량급흔량원소함량진행료검측。결과표명,과로A화B제진전후대응적PM2.5립수급질량농도분포균불동;과로A화B산생적PM2.5분별이교위광활구형화불규칙형상위주,과로A제진후PM2.5정표면조조구형,과로B제진후PM2.5단과립형모특정불변;과로A화과로B산생적PM2.5제진전후재각립경단중Si、Al、Fe、Ca화Mg함량기본일치,As、Cd화Se함량수착립경적감소이증대;제진후과로A산생PM2.5중As화Se함량증가,차재아미미PM2.5중As화Se함량적증가경명현,과로B제진후PM2.5중As화Se함량기본불변。
A dilution sampling method was used to collect PM2.5 before and after COHPACs (compact hybrid particulate collector) generated by a pulverized coal boiler (boiler A) and a circulating fluidized bed boiler (boiler B) with installed capacities of 220 MW and 300 MW, respectively. Particle size distributions (PSDs) of PM2.5 were analyzed by ELPI; individual microstructures of PM2.5 were analyzed by SEM (scanning electron microscopy);concentrations of minor elements in PM2.5 were analyzed by EDX (energy-dispersive X-ray analysis) and concentrations of trace elements in PM2.5 were analyzed by ICP-OES (inductively coupled plasma optical emission spectroscopy). The distribution characteristics of number and mass concentration of PM2.5 at the corresponding sampling positions of two boilers were different. Most of the PM2.5 before and after COHPAC-A (boiler A’s) were spherical;most of the PM2.5 before and after COHPAC-B (boiler B’s) were irregular in shape;the PM2.5 after COHPAC-A were with relatively uneven surface, PM2.5 microstructures before and after COHPAC-B were similar;mass fraction size distributions of Si, Al, Fe, Ca and Mg in PM2.5 before and after the two COHPACs were similar;mass fraction size distributions of As, Cd and Se in PM2.5 before and after the two COHPACs increased with decreasing size;mass fraction size distributions of As and Se in submicron PM2.5 after COHPAC-A were higher than those before COHPAC-A, but mass fraction size distributions of As and Se in PM2.5 before and after COHPAC-B were correspondingly nearly the same.