Synergetic mechanism of hygroscopic agent, surfactant and catalyst on desulfurization of flue gas circulating fluidized bed

doi:10.11949/j.issn.0438-1157.20180502

Abstract

Abstract:

To improve the desulfurization efficiency of flue gas circulating fluidized bed (FG-CFB), some synergists, such as hygroscopic agent, surfactants and catalyst, were added into the slaked lime. The experiments of desulfurization were carried out in FG-CFB. The results showed that the desulfurization efficiencies of 97.14%, 97.70% and 98.45% were achieved in which magnesium chloride(MgCl₂), sodium dodecyl benzene sulfonate(SDBS), and adipic acid were added 1.3%, 0.03%, and 1.2% respectively. The desulfurization efficiency of 99.19% was obtained when hygroscopic agent, surfactant and catalyst were added into desulfurizer together with the mass fraction of 1.3%, 0.03% and 1.2%. Synergetic mechanism of MgCl₂, SDBS and adipic acid were analyzed on the removal efficiencies of desulfurization. The desulfurization efficiency of flue gas circulating fluidized bed can be improved with a suitable content of hygroscopic agent, surfactant and catalysis in the desulfurizer and the outlet concentration reaches ultra-low emissions requirements.

Key words: flue gas circulating fluidized bed, ultra-low emissions, desulfurization efficiency, hygroscopic agent, surfactants, catalyst

摘要：

为了解决烟气循环流化床脱硫效率偏低、烟气出口二氧化硫浓度不符合超低排放要求的问题，对在脱硫剂中添加增效剂进行了实验研究，得到了吸湿剂、表面活性剂和催化剂三种试剂添加量与脱硫效率间的关系。结果表明：单独添加吸湿剂氯化镁、表面活性剂十二烷基苯磺酸钠及催化剂已二酸的质量分数分别为1.3%、0.03%和1.2%时，脱硫效率最高分别可达97.14%、97.70%和98.45%；吸湿剂、表面活性剂和催化剂共同添加质量分数分别为1.3%、0.03%和1.2%时，脱硫效率最佳，可高达99.19%；相较于未添加增效剂时95.37%的脱硫效率，提升效果明显。添加适量的吸湿剂、表面活性剂和催化剂能够使烟气二氧化硫排放浓度符合超低排放要求，是有效提高半干法烟气循环流化床脱硫效率的方法。

关键词: 烟气循环流化床, 超低排放, 脱硫效率, 吸湿剂, 表面活性剂, 催化剂

CLC Number:

X701.3

HAN Tianyi, YAO Yuan, XU Jun, QI Liqiang, LI Jintao, TENG Fei. Synergetic mechanism of hygroscopic agent, surfactant and catalyst on desulfurization of flue gas circulating fluidized bed[J]. CIESC Journal, 2018, 69(9): 4044-4050.

韩天义, 姚远, 徐珺, 齐立强, 李锦涛, 滕菲. 吸湿剂、表面活性剂及催化剂对烟气循环流化床脱硫的增效机制[J]. 化工学报, 2018, 69(9): 4044-4050.

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