Na_2S_2O_8/NaClO_2复合吸收液工业脱硝新方法
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摘要
针对氮氧化物排放标准日益严格而现有脱硝技术不能满足要求的现状,提出了Na_2S_2O_8/NaClO_2复合吸收液脱硝的新方法。在小型鼓泡反应器中进行脱硝实验,讨论了Na_2S_2O_8和NaClO_2浓度、反应温度、溶液pH、NO浓度等因素对NO脱除效率的影响,在此基础上分析了复合吸收液的脱硝机理。通过比较复合吸收液与单一吸收液的脱硝效果和成本,探究其在脱硝方面的工业应用前景。实验结果表明:当吸收液初始pH为5,Na_2S_2O_8浓度为0.05 mol/L,NaClO_2浓度为0.0025 mol/L,反应温度为50℃时,NO脱硝率可达95%;复合吸收液ClO~-_2、ClO_2、S_2O~(2-)_8共同参与NO的脱硝反应,中间产物ClO_2担负了重要氧化吸收作用,显著地提高了脱硝效率;Na_2S_2O_8/NaClO_2复合吸收液比单一吸收液脱硝成本低、效率高,工业应用前景良好。
Aiming at the status quo that NO_x emission controlling standards are increasingly strict and existing denitration technologies cannot meet requirements, a new method for denitration by Na_2S_2O_8/NaClO_2 compound absorbent was proposed. The denitration experiment was carried out in a small bubble reactor, and the effects of Na_2S_2O_8 and NaClO_2 concentrations, reaction temperatures, the solution pH and NO concentration on the NO removal efficiency were discussed, and based on which the denitration mechanism of the compound absorbent was analyzed. By comparing the denitration effect and cost between the compound absorbent and the single absorbent, its industrial application prospect in denitration was explored. The results indicated that: for the absorbent, when the initial pH was 5, the concentrations of Na_2S_2O_8 and NaClO_2 were 0.05 mol/L and 0.0025 mol/L respectively, and the reaction temperature was 50 ℃, the NO removal efficiency could be up to 95%; the ClO~-_2, ClO_2, and S_2O~(2-)_8 compound absorbents co-participated in removal reaction of NO, and the intermediate product ClO_2 played an important role of oxidation adsorption and improved the denitration efficiency significantly; the new method of the Na_2S_2O_8/NaClO_2 compound absorbent had a striking industrial application due to its lower cost and higher efficiency than that of the single adsorption absorbent method.
Aiming at the status quo that NO_x emission controlling standards are increasingly strict and existing denitration technologies cannot meet requirements, a new method for denitration by Na_2S_2O_8/NaClO_2 compound absorbent was proposed. The denitration experiment was carried out in a small bubble reactor, and the effects of Na_2S_2O_8 and NaClO_2 concentrations, reaction temperatures, the solution pH and NO concentration on the NO removal efficiency were discussed, and based on which the denitration mechanism of the compound absorbent was analyzed. By comparing the denitration effect and cost between the compound absorbent and the single absorbent, its industrial application prospect in denitration was explored. The results indicated that: for the absorbent, when the initial pH was 5, the concentrations of Na_2S_2O_8 and NaClO_2 were 0.05 mol/L and 0.0025 mol/L respectively, and the reaction temperature was 50 ℃, the NO removal efficiency could be up to 95%; the ClO~-_2, ClO_2, and S_2O~(2-)_8 compound absorbents co-participated in removal reaction of NO, and the intermediate product ClO_2 played an important role of oxidation adsorption and improved the denitration efficiency significantly; the new method of the Na_2S_2O_8/NaClO_2 compound absorbent had a striking industrial application due to its lower cost and higher efficiency than that of the single adsorption absorbent method.
引文
[1] 马振,万皓. 燃煤烟气同时脱硫脱硝方法的研究进展及分析[J]. 环境工程,2017,35(2):78-82.
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[7] 韩颖慧,赵毅,陈诚,等. 几种改性同时脱硫脱硝吸收剂的比较研究[J]. 华北电力大学学报,2010,37(6):85-89.
[8] 王琼,胡将军,邹鹏. NaClO2湿法烟气脱硫脱硝技术的研究[J]. 江西电力,2004,28(6):14-16.
[9] 秦毅红,胡彬,杜凯,等. Na2S2O8溶液脱硝的热力学计算与试验研究[J]. 硫酸工业,2017(7):10-15.
[10] Adewuyi Y G, Sakyi N Y. Simultaneous absorption and oxidation of nitric oxide and sulfur dioxide by aqueous solutions of sodium persulfate activated by temperature[J]. Industrial & Engineering Chemistry Research,2013,52(33):11702-11711.
[11] 林杉帆,张博浩,卫泽华,等. 过硫酸钠工艺同时氧化吸收燃煤烟气中NO和SO2的研究[J]. 应用化工,2015,44(6):1021-1025.
[12] 康雪,马晓迅,高续春,等. 过硫酸钠溶液氧化吸收NO工艺[J]. 化学工程,2013,41(8):11-15.
[13] 谢珊,李新杰,高宏亮,等. ClO2溶液去除烟气中NO的效果及工程应用[J]. 化工环保,2016,36(1):84-89.
[14] Deshwal B R, Jin D S, Lee S H, et al. Removal of NO from flue gas by aqueous chlorine-dioxide scrubbing solution in a lab-scale bubbling reactor[J]. Journal of Hazardous Materials,2008,150(3):649-655.
[15] Fang G, Dionysiou D, Wang Y, et al. Sulfate radical-based degradation of polychlorinated biphenyls: effects of chloride ion and reaction kinetics[J]. Journal of Hazardous Materials,2012,227:394-401.
[16] Liang C, Wang Z, Bruell C J. Influence of pH on persulfate oxidation of TCE at ambient temperatures[J]. Chemosphere,2007,66(1):106-113.
[17] 郑德康, 韩志涛, 杨少龙, 等. UV辐照强化NaClO2溶液脱硝实验研究[J]. 化学工程, 2017, 45(2):45-49.
[18] 赵静, 严金英, 邱婧伟,等. NaClO2/NaClO复合吸收液同时脱硫脱硝[J]. 环境工程学报, 2012, 6(10):3684-3688.
[19] 张朋,杨一理,许红檑,等. NaClO2/NaClO复合吸收剂同时脱硫脱硝机理研究[J]. 热力发电,2013,42(11):93-96.
[2] 顾卫荣,周明吉,马薇. 燃煤烟气脱硝技术的研究进展[J]. 化工进展,2012,31(9):2084-2092.
[3] 王占山,潘丽波,李云婷,等. 火电厂大气污染物排放标准对区域酸沉降影响的数值模拟[J]. 中国环境科学,2014,35(9):2420-2429.
[4] 庄凤来,刘少光,林文松,等. 低钒和无钒基氧化物类NH3-SCR催化剂研究进展[J]. 环境工程,2016,34(12):98-102.
[5] 张萍,潘卫国,郭瑞堂,等. 燃煤烟气污染物协同控制技术的研究进展[J]. 应用化工,2017,46(12):2447-2450.
[6] Zhao Y, Guo T, Chen Z, et al. Simultaneous removal of SO2 and NO using M/NaClO2 complex absorbent[J]. Chemical Engineering Journal,2010,160(1):42-47.
[7] 韩颖慧,赵毅,陈诚,等. 几种改性同时脱硫脱硝吸收剂的比较研究[J]. 华北电力大学学报,2010,37(6):85-89.
[8] 王琼,胡将军,邹鹏. NaClO2湿法烟气脱硫脱硝技术的研究[J]. 江西电力,2004,28(6):14-16.
[9] 秦毅红,胡彬,杜凯,等. Na2S2O8溶液脱硝的热力学计算与试验研究[J]. 硫酸工业,2017(7):10-15.
[10] Adewuyi Y G, Sakyi N Y. Simultaneous absorption and oxidation of nitric oxide and sulfur dioxide by aqueous solutions of sodium persulfate activated by temperature[J]. Industrial & Engineering Chemistry Research,2013,52(33):11702-11711.
[11] 林杉帆,张博浩,卫泽华,等. 过硫酸钠工艺同时氧化吸收燃煤烟气中NO和SO2的研究[J]. 应用化工,2015,44(6):1021-1025.
[12] 康雪,马晓迅,高续春,等. 过硫酸钠溶液氧化吸收NO工艺[J]. 化学工程,2013,41(8):11-15.
[13] 谢珊,李新杰,高宏亮,等. ClO2溶液去除烟气中NO的效果及工程应用[J]. 化工环保,2016,36(1):84-89.
[14] Deshwal B R, Jin D S, Lee S H, et al. Removal of NO from flue gas by aqueous chlorine-dioxide scrubbing solution in a lab-scale bubbling reactor[J]. Journal of Hazardous Materials,2008,150(3):649-655.
[15] Fang G, Dionysiou D, Wang Y, et al. Sulfate radical-based degradation of polychlorinated biphenyls: effects of chloride ion and reaction kinetics[J]. Journal of Hazardous Materials,2012,227:394-401.
[16] Liang C, Wang Z, Bruell C J. Influence of pH on persulfate oxidation of TCE at ambient temperatures[J]. Chemosphere,2007,66(1):106-113.
[17] 郑德康, 韩志涛, 杨少龙, 等. UV辐照强化NaClO2溶液脱硝实验研究[J]. 化学工程, 2017, 45(2):45-49.
[18] 赵静, 严金英, 邱婧伟,等. NaClO2/NaClO复合吸收液同时脱硫脱硝[J]. 环境工程学报, 2012, 6(10):3684-3688.
[19] 张朋,杨一理,许红檑,等. NaClO2/NaClO复合吸收剂同时脱硫脱硝机理研究[J]. 热力发电,2013,42(11):93-96.
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