东南大学学报(自然科学版)
東南大學學報(自然科學版)
동남대학학보(자연과학판)
JOURNAL OF SOUTHEAST UNIVERSITY
2014年
5期
968-974
,共7页
居静%钟文琪%李颖%周颖倩%王天才%刘飞
居靜%鐘文琪%李穎%週穎倩%王天纔%劉飛
거정%종문기%리영%주영천%왕천재%류비
脱硫脱硝%旋转喷雾塔%数值模拟%欧拉%拉格朗日方法%脱除效率
脫硫脫硝%鏇轉噴霧塔%數值模擬%歐拉%拉格朗日方法%脫除效率
탈류탈초%선전분무탑%수치모의%구랍%랍격랑일방법%탈제효솔
desulfurization and denitration%rotating spray tower%numerical simulation%Euler-La-grange approach%removal efficiency
针对开发低温烟气联合脱硫脱硝技术的需求,采用欧拉拉格朗日方法,建立了旋转喷雾塔气固流动与脱硫脱硝反应耦合的三维数理模型。气相场采用k-ε湍流模型,SO2,NOx的吸收采用双膜理论模型。以2个180 m2烧结烟气的旋转喷雾塔为模拟对象,采用Ca(OH)2/NaClO2浆液作为吸收剂,考察了NaClO2/Ca(OH)2摩尔比、烟气流速、烟气温度、SO2和NO的浓度等对烟气二氧化硫和氮氧化物脱除效率的影响。研究结果表明:随着溶液中NaClO2/Ca(OH)2摩尔比的增加,氮氧化物的脱除效率显著提高,二氧化硫的脱除效率无明显变化;随烟气流速、温度的增大,二氧化硫以及氮氧化物脱除效率均有所降低;氮氧化物的脱除效率随SO2浓度的增大无显著变化,而二氧化硫的脱除效率明显降低;随NO浓度的增加,氮氧化物脱除效率明显降低,二氧化硫脱除效率无显著变化。
針對開髮低溫煙氣聯閤脫硫脫硝技術的需求,採用歐拉拉格朗日方法,建立瞭鏇轉噴霧塔氣固流動與脫硫脫硝反應耦閤的三維數理模型。氣相場採用k-ε湍流模型,SO2,NOx的吸收採用雙膜理論模型。以2箇180 m2燒結煙氣的鏇轉噴霧塔為模擬對象,採用Ca(OH)2/NaClO2漿液作為吸收劑,攷察瞭NaClO2/Ca(OH)2摩爾比、煙氣流速、煙氣溫度、SO2和NO的濃度等對煙氣二氧化硫和氮氧化物脫除效率的影響。研究結果錶明:隨著溶液中NaClO2/Ca(OH)2摩爾比的增加,氮氧化物的脫除效率顯著提高,二氧化硫的脫除效率無明顯變化;隨煙氣流速、溫度的增大,二氧化硫以及氮氧化物脫除效率均有所降低;氮氧化物的脫除效率隨SO2濃度的增大無顯著變化,而二氧化硫的脫除效率明顯降低;隨NO濃度的增加,氮氧化物脫除效率明顯降低,二氧化硫脫除效率無顯著變化。
침대개발저온연기연합탈류탈초기술적수구,채용구랍랍격랑일방법,건립료선전분무탑기고류동여탈류탈초반응우합적삼유수리모형。기상장채용k-ε단류모형,SO2,NOx적흡수채용쌍막이론모형。이2개180 m2소결연기적선전분무탑위모의대상,채용Ca(OH)2/NaClO2장액작위흡수제,고찰료NaClO2/Ca(OH)2마이비、연기류속、연기온도、SO2화NO적농도등대연기이양화류화담양화물탈제효솔적영향。연구결과표명:수착용액중NaClO2/Ca(OH)2마이비적증가,담양화물적탈제효솔현저제고,이양화류적탈제효솔무명현변화;수연기류속、온도적증대,이양화류이급담양화물탈제효솔균유소강저;담양화물적탈제효솔수SO2농도적증대무현저변화,이이양화류적탈제효솔명현강저;수NO농도적증가,담양화물탈제효솔명현강저,이양화류탈제효솔무현저변화。
A three-dimensional numerical model of a rotating spray tower gas-solid flow coupling with simultaneous desulfurization and denitration reaction was set up on the Euler-Lagrange approach for the demand of the development of low temperature flue gas desulfurization and denitration tech-nology.The k-εturbulence model was used for the gas phase,and the two-film theory absorption model for the absorption of SO2,NOx.The investigation of the influence of NaClO2/Ca(OH)2 mo-lar ratio,gas velocity,gas temperature,SO2 and NO concentration on the removal efficiency of sul-fur dioxide and nitrogen oxides using Ca(OH)2/NaClO2 slurry as the absorbent was carried out on a model of 2 ×1 80 m2 sintering gas rotating spray tower.Research results show that with the increase of NaClO2/Ca(OH)2 molar ratio,the removal efficiency of nitrogen oxides increases significantly, while the removal efficiency of sulfur dioxide has no obvious change.With the increase of gas veloc-ity and temperature,both the removal efficiency of sulfur dioxide and nitrogen oxides decrease.The removal efficiency of nitrogen oxides has no significant change with the increase of SO2 concentra-tion,while the removal efficiency of sulfur dioxide decreases obviously.With the increase of NO concentration,the removal efficiency of nitrogen oxides decreases obviously,while the removal effi-ciency of sulfur dioxide has no significant change.