螺旋切割强化湿法烟气脱硫的传质动力学
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摘要
针对开发的新型静态螺旋切割强化湿法烟气脱硫技术,根据双膜理论从动力学角度建立了静态螺旋切割强化Ca(OH)_2溶液吸收烟气SO_2的动力学模型,并采用单因素实验探究了烟气SO_2浓度、烟气流量、脱硫剂浓度以及脱硫剂循环流量对传质速率的影响。结果表明:模型能较好地描述静态螺旋切割强化湿法烟气脱硫的实际过程,理论计算与实验数据都发现,烟气SO_2浓度、烟气流量、脱硫剂浓度以及脱硫剂循环流量的增加均有助于提高传质速率;但当脱硫剂浓度大于5%时,传质速率随脱硫剂浓度的增加改变不大。
For a newly developed wet flue gas desulfurization technology enhanced by static spiral cutting, a kinetic SO_2 absorption model from flue gas by Ca(OH)_2 solution enhanced by static spiral cutting was established based on the double membrane theory, and a series of single factor experiments were conducted to explore the effects of flue gas SO_2 concentration and flow rate, desulfurizer concentration and circulation flow rate on mass transfer rate. The results show that this kinetic model could describe the actual process of wet flue gas desulfurization enhanced by static spiral cutting well. Both theoretical calculations and experimental data indicated that the increase of flue gas SO_2 concentration and flow rate, desulfurizer concentration and circulation flow rate was conducive to mass transfer rate improvement. However, mass transfer rate showed slight change with the increase of desulfurizer concentration at the desulfurizer concentrations greater than 5%. This research could provide a basis for the development of a new wet flue gas desulfurization system based on spiral cutting reinforcement.
For a newly developed wet flue gas desulfurization technology enhanced by static spiral cutting, a kinetic SO_2 absorption model from flue gas by Ca(OH)_2 solution enhanced by static spiral cutting was established based on the double membrane theory, and a series of single factor experiments were conducted to explore the effects of flue gas SO_2 concentration and flow rate, desulfurizer concentration and circulation flow rate on mass transfer rate. The results show that this kinetic model could describe the actual process of wet flue gas desulfurization enhanced by static spiral cutting well. Both theoretical calculations and experimental data indicated that the increase of flue gas SO_2 concentration and flow rate, desulfurizer concentration and circulation flow rate was conducive to mass transfer rate improvement. However, mass transfer rate showed slight change with the increase of desulfurizer concentration at the desulfurizer concentrations greater than 5%. This research could provide a basis for the development of a new wet flue gas desulfurization system based on spiral cutting reinforcement.
引文
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[15]陈姣,袁舒欣,杨刚,等.一种文丘里雾化喷嘴设计[J].机械研究与应用,2015,28(2):114-115.
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[22]任宝山,郝红勋,李志广.含固体微粒悬浮液的化学吸收动力学的研究[J].河北工业大学学报,2000,29(5):10-13.
[23]SADA E,KUMAZAWA H,SAWADA Y.Absorption of sulfur dioxide into aqueous slurries sparingly soluble fine particles[J].Chemical Engineering Science,1980,35(5):771-774.
[24]DEREK G,LEAIST J.Diffusion coefficient of aqueous sulfur dioxide at 25℃[J].Journal of Chemical and Engineering,1984,9(3):81-82.
[25]米俊锋,潘一,杜胜男,等.接地极雾化电晕放电技术去除SO2的研究[J].化学工程,2016,44(5):6-10.
[26]郭威,李彩亭,李珊红,等.活性焦联合脱硫脱硝脱汞塔入口气流均布与喷氨优化[J].环境工程学报,2017,11(5):2851-2857.
[2]袁进,江霞,刘一天,等.氧化锰共生矿烟气脱硫的机理及影响因素[J].环境工程学报,2018,12(4):1104-1111.
[3]KEPING Y,RUINIAN L,TIANLE Z,et al.A semi-wet technological process for flue gas desulfurization by corona discharges at an industrial scale[J].Chemical Engineering Journal,2005,116(2):139-147.
[4]贾绍广,于伟静,张润盘,等.蒸发塔技术用于脱硫废水的处理[J].环境工程学报,2017,11(4):2241-2246.
[5]唐杰林.燃煤烟气脱硫脱硝技术研究进展[J].化工管理,2016,32(3):156-161.
[6]周理明,史永永,李海洋,等.氨法烟气脱硫过程的工艺优化[J].化学工程,2014,42(4):7-12.
[7]HONGLIANG G,CAITING L,GUANGMING Z,et al.Flue gas desulphurization based on limestone-gypsum with a novel wet-type PCF device[J].Separation and Purification Technology,2010,24(9):4944-4951.
[8]曹露.单塔双区高效石灰石-石膏湿法脱硫工艺在大型火电厂中的应用[J].环境污染与防治,2016,38(2):111-119.
[9]林永明.大型石灰石-石膏湿法喷淋脱硫技术研究及工程应用[D].杭州:浙江大学,2006.
[10]吴璨,赵枫,崔政伟.螺旋切割强化臭氧氧化降解苯酚废水的研究[J].环境污染与防治,2018,40(11):1239-1242.
[11]程坤.富氧水制备装置的设计和试验研究[D].无锡:江南大学,2017.
[12]徐臻伟,崔政伟,袁方洋,等.静态螺旋切割器内气液两相流动与压降特性数值研究[J].食品与机械,2018,34(3):89-92.
[13]张少峰,王江涛,刘燕.Kenics静态混合器在水平液固循环流化床中的研究[J].化学工程,2012,40(6):43-46.
[14]王婷,丁林,宋永吉,等.Y2O3/AC催化剂的烟气同时脱硫脱硝性能[J].环境工程学报,2016,10(11):6555-6562.
[15]陈姣,袁舒欣,杨刚,等.一种文丘里雾化喷嘴设计[J].机械研究与应用,2015,28(2):114-115.
[16]杨春和,李贤.氨法烟气脱硫制亚硫酸氢铵过程模拟优化[J].现代化工,2017,37(3):199-202.
[17]FENG D D,GAO J M,ZHANG Y,et al.Mass transfer in ammonia-based CO2absorption in bubbling reactor under static magnetic field[J].Chemical Engineering Journal,2018,338(1):450-456.
[18]KORMáNYOS B,NAGYPáL I,PEINTLER G,et al.Effect of chloride ion on the kinetics and mechanism of the reaction between chlorite ion and hypochlorous acid[J].Inorganic Chemistry,2004,47(17):7914-7920.
[19]LEHTIMAA T,TARVO V,MORTHA G,et al.Reactions and kinetics of Cl(III)decomposition[J].Industrial&Engineering Chemistry Research,2010,47(15):5284-5290.
[20]蒋文举.烟气脱硫脱硝技术手册[M].2版.北京:化学工业出版社,2012.
[21]RAMACHANDRAN P A,SHARMA M M.Absorption with fast reaction in a slurry containing sparingly soluble fine particles[J].Chemical Engineering Science,1969,24(11):1681-1686.
[22]任宝山,郝红勋,李志广.含固体微粒悬浮液的化学吸收动力学的研究[J].河北工业大学学报,2000,29(5):10-13.
[23]SADA E,KUMAZAWA H,SAWADA Y.Absorption of sulfur dioxide into aqueous slurries sparingly soluble fine particles[J].Chemical Engineering Science,1980,35(5):771-774.
[24]DEREK G,LEAIST J.Diffusion coefficient of aqueous sulfur dioxide at 25℃[J].Journal of Chemical and Engineering,1984,9(3):81-82.
[25]米俊锋,潘一,杜胜男,等.接地极雾化电晕放电技术去除SO2的研究[J].化学工程,2016,44(5):6-10.
[26]郭威,李彩亭,李珊红,等.活性焦联合脱硫脱硝脱汞塔入口气流均布与喷氨优化[J].环境工程学报,2017,11(5):2851-2857.
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