登录
注册
E-alert
登录
注册
E-alert
EXPERIMENTAL STUDY ON SIMULTANEOUS DENITRATION AND DESULFURIZATION BY FLY ASH AND CARBIDE SLAG SUPPORTED Na2O UNDER MICROWAVE FIELD
-
摘要: 以粉煤灰与电石渣的混合物(FC)作为载体,Na2O为活性组分,采用超声波浸渍法制备了吸附剂Na2O/FC。通过XRD、BET、SEM分析对吸附剂进行表征,探讨在微波辐射下吸附剂协同脱硫脱硝机制。结果表明:微波下Na2O负载可显著提高吸附剂的性能;6%Na2O/FC(其中6%代表活性组分Na2O在吸附剂中质量分数)的协同脱硫脱硝性能最佳,其脱硫t90%和t50%(tx%为吸附剂的脱硫率或脱硝率达到x%时的反应时间)分别为12,73 min,脱硝t90%和t50%分别为4,16 min。机理分析表明:协同脱硫脱硝过程起初以物理吸附为主,反应进行一段时间后以化学吸附为主。微波下吸附剂Na2O/FC的化学吸附过程为活性氧将SO2和NO氧化为SO3和N2O5后,SO3和N2O5与金属氧化物反应生成Ca5(SiO4)2SO4、(MgxCa1-x)(NO3)2、CaSO4等硫酸盐和硝酸盐,同时活性组分Na2O可直接与吸附态的SO2与NO结合生成Na2SO3和NaNO3。Abstract: In this paper, the mixture of fly ash and carbide slag(FC) was used as the carrier, Na2O as the active component, and the adsorbent x% Na2O/FC(x% represents the mass ratio of active component Na2O in the adsorbent) was prepared by ultrasonic impregnation method. The adsorbents were characterized by XRD, BET and SEM, and the mechanism of simultaneous desulfurization and denitration of adsorbents under microwave radiation was discussed. The results showed that Na2O loading under microwave significantly improved the performance of the adsorbent. Simultaneous desulfurization and denitrification performance of 6%Na2O/FC was the best. The desulfurization t90% and t50%(tx% was the reaction time when the desulfurization rate of adsorbents or the denitrification rate reached x%) were 12 min and 73 min, and the denitrification t90% and t50% were 4 min and 16 min. The mechanism analysis showed that the simultaneous desulfurization and denitration process was dominated by physical adsorption at first, and chemical adsorption after a period of reaction. The chemisorption process of Na2O/FC adsorbent under microwave was found as follows: SO2 and NO were oxidized into SO3 and N2O5 by active oxygen species, and SO3 and N2O5 reacted with metal oxides to generate sulfates and nitrates such as Ca5(SiO4)2SO4,(MgxCa1-x)(NO3)2 and CaSO4. At the same time, the active component Na2O directly reacted with the adsorbed SO2 and NO to form Na2SO3 and NaNO3.
-
Key words:
- fly ash /
- carbide slag /
- simultaneous desulfurization and denitration /
- sorbent /
- microwave
-
[1] 发改委.钢铁行业2020年1—12月运行情况[J].中国冶金,2021,31(2):71. [2] 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. [3] 胡沈达,苏伟,邢奕,等.O3氧化-湿式镁法同步脱除烧结烟气中NOx和SO2的中试研究[J].环境工程,2020,38(5):102-106. [4] 雷瑞,付东升,李国法,等.粉煤灰综合利用研究进展[J].洁净煤技术,2013,19(3):106-109. [5] NARRATE I,VARGAS F,MARTINEZ P,et al.Flue gas desulfurization (FGD) fly ash as a sustainable,safe alternative for cement-based materials[J].Journal of Cleaner Production,2021,283:124646. [6] ZHAI M,GUO L,SUN L,et al.Desulfurization performance of fly ash and CaCO3 compound absorbent[J].Powder Technology,2017,305:553-561. [7] 王慧青,童继红,沈立平.电石渣的资源化利用途径[J].化工生产与技术,2007,4(1):47-51,1. [8] WANG Y L,HAN X N,CHEN M N,et al.Desulfurization and denitrification performance of modified rice husk ash-carbide slag absorbent[J].Materials,2021,14(1):68. [9] TYAGI V K,LO S L.Microwave irradiation:a sustainable way for sludge treatment and resource recovery[J].Renewable and Sustainable Energy Reviews,2013,18:288-305. [10] NUCHTER M,ONDRUSCHKA B,BONRATH W,et al.Microwave assisted synthesis:a critical technology overview[J].Green chemistry,2004,6(3):128-141. [11] 李腾,赵翠,李萍.微波脱硫技术的研究进展[J].当代化工,2014,43(4):608-610. [12] 马双忱,赵毅,马宵颖,等.活性炭床加微波辐射脱硫脱硝的研究[J].热能动力工程,2006,21(4):338-341,433. [13] QI Y F,GE P,WANG M T,et al.Experimental investigation and numerical simulation of simultaneous desulfurization and denitrification by H2O2 solution assisted with microwave and additive[J].Chemical Engineering Journal,2020,391:123559. [14] PRIYA M V,ARUNRAJ B,RAIESH N.Twin-fold new methodology arising from microwave induced carbonization of newspaper waste for the adsorptive desulfurization of model oil[J].Fuel,2021,299:120873. [15] FENG Y,WANG J C,HU Y F,et al.Microwave heating motivated performance promotion and kinetic study of iron oxide sorbent for coal gas desulfurization[J].Fuel,2020,267:117215. [16] REN S,GUO F Q,ZHAO Q,et al.Sintering flue gas desulfurization with different carbon materials modified by microwave irradiation[J].Journal of Iron and Steel Research International,2017,24(10):979-984. [17] 庞子涛,程亮,宋永吉,等.FeCoY催化剂的催化还原脱硫脱硝性能[J].精细化工,2019,36(6):1111-1117. [18] 赵珂,宁平,李凯,等.Mn/Cu-BTC催化剂同时脱硫脱硝实验研究[J].化工进展,2020,39(5):1784-1791. 期刊类型引用(2)
1. 王树桥，袁京周，郭婧涵，张丁超，韩梦非，葛宇轩，耿雅娴，王欣. 基于电磁场模拟微波对土壤苯系污染物的脱附研究. 环境工程. 2024(03): 190-198 . 
本站查看2. 李亚娇，鱼郑，鞠恺，任武昂，唐仁龙，金鹏康. 粉煤灰基膏体充填脱氨方法研究综述. 煤炭科学技术. 2023(06): 265-274 . 百度学术其他类型引用(1)
-
点击查看大图
计量
- 文章访问数: 181
- HTML全文浏览量: 13
- PDF下载量: 9
- 被引次数: 3
下载:
