Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
권호 표지
DOI QR코드

DOI QR Code

Improvement of Desulfurization Performance of Low-grade Limestone Slurry Using Organic Acid Additives

유기산 첨가제를 이용한 저품질 석회석 슬러리의 탈황 성능 개선

  • Jeong, Ji Eun (Department of Environmental Engineering, Kongju National University) ;
  • Cho, In Ah (Department of Environmental Engineering, Kongju National University) ;
  • Lee, Chang-Yong (Department of Environmental Engineering, Kongju National University)
  • Received : 2021.03.09
  • Accepted : 2021.03.18
  • Published : 2021.04.10
Download PDF
⟨ Previous Next ⟩

Abstract

Desulfurization reaction in a bubble type reactor was carried out by adding three organic acids such as acetic acid, lactic acid, and antic acid to investigate the enhancement of the desulfurization performance of low-grade limestone. Desulfurization of limestone slurry without organic acids initiated to degrade at pH 5.2 or less, whereas organic acid-added limestone slurry exhibited a stable efficiency in the initial desulfurization with slurry pH ranging 4.2~4.5. At slurry pH below 4, the desulfurization performance of limestone slurry with addition of organic acids may be related to the amount of anions produced by dissociation of the organic acids. When limestone slurry had a large amount of anions, a rapid decrease in buffer capacity of slurry pH did not occur. These results were due to the acidity and dissociation of organic acids. The desulfurization performance of low-grade limestone slurry increased in the order of acetic acid (2.6%) < lactic acid (6.4%) < formic acid (16.7%).

저품질 석회석의 탈황 성능 개선을 알아보기 위해 초산, 젖산, 개미산 등 3종의 유기산 첨가제를 사용하여 기포형 반응기에서 탈황 반응을 수행하였다. 유기산이 첨가되지 않은 석회석 슬러리는 pH 5.2 이하에서 초기 탈황 효율의 저하가 일어났다. 반면, 유기산이 첨가된 석회석 슬러리는 pH 4.2~4.5에서 안정된 초기 탈황 효율을 나타내었다. 슬러리 pH 4 이하에서 유기산이 첨가된 석회석 슬러리의 탈황 성능은 유기산의 해리에 의해 생성된 음이온의 양과 연관될 수 있다. 슬러리 중 유기산의 음이온 양이 많으면 슬러리 pH의 완충 기능 저하가 급격히 일어나지 않았다. 이와 같은 결과들은 유기산의 산성도 및 해리도에 기인하였다. 3종의 유기산 첨가에 따른 저품질 석회석 슬러리의 탈황 성능 증가율은 초산(2.6%) < 젖산 (6.4%) < 개미산 (16.7%) 순으로 나타났다.

Keywords

References

  1. B. Gong, J. Kim, H. Kim, S. Lee, H. Kim, J. Jo, J. Kim, D. Gang, J.M. Park, and J. Hong, A study on the characteristics of condensable fine particles in flue gas, J. Korean Soc. Atmos. Environ., 32, 501-512 (2016). https://doi.org/10.5572/KOSAE.2016.32.5.501
  2. J. H. Seo, C. S. Baek, J. S. Cho, Y. J. Ahn, J. W. Ahn, and K. H. Cho, Evaluation and application of grinding index of domestic desulfurization limestone, J. Energy Eng., 28, 1-9 (2019).
  3. S. Y Liu, P. Liu, J. Gao, J. Y. Liu, Z. X. Ye, and C. H. Xu, Simulation studies on limestone dissolution with organic acid additives in limestone-based flue gas desulfurization, Proceedings of the 2nd International Conference on Bioinformatics and Biomedical Engineering (ICBBE 2008), 3899-3902, May 16-28, Shanghai, China (2008).
  4. S. K. Seo, Y. S. Chu, K. B. Shim, J. K. Lee, and H. Song, A study on the desulfurization efficiency of limestone sludge with various admixtures, J. Korean Ceram. Soc., 52, 479-482 (2015). https://doi.org/10.4191/kcers.2015.52.6.479
  5. H. S. Kim, Y. I. Yoon, H. K. Lee, and S. H. Kim, Study of desulfurization of limestone and crystal habit of gypsum by adding dibasic acid as buffer additives, J. Korean Ind. Eng. Chem., 13, 468-475 (2002).
  6. J. H. Lim, Y. R. Choi, G. Y. Kim, H. J. Song, and J. H. Kim, Modeling of wet flue gas desulfurization process for utilization of low-grade limestone, Korean Chem. Eng. Res., 57, 743-748 (2019). https://doi.org/10.9713/kcer.2019.57.5.743
  7. H. S. Kim, Necessity of refining domestic limestone, J. Korean Inst. Resour. Recycl., 20, 3-22 (2011).
  8. R. Feng, Z. Sun, W. Zhang, H. Huang, H. Hu, L. Zhang, and H. Xie, Improving the desulfurization performance of CaCO3 with sodium humate, IOP Conf. Ser.: Earth Environ. Sci., 121, 032025 (2018). https://doi.org/10.1088/1755-1315/121/3/032025
  9. L. Lv, J. Yang, Z. Shen, Y. Zhou, and J. Lu, Selecting organic desulphurization additives in flue gas desulphurization process, Ener. Source. Part A, 38, 2649-2655 (2016). https://doi.org/10.1080/15567036.2015.1079570
  10. Korean Limestone Industry Cooperation, Limestone for flue gas desulfurization, SPS-KLIC 004-0775 (2018).
  11. S. Y. Liu and W. D. Xiao, Modeling and simulation of a bubbling SO2 absorber with granular limestone slurry and an organic acid additive, Chem. Eng. Technol., 29, 1167-1173 (2006). https://doi.org/10.1002/ceat.200600101
  12. J. H. Seo, C. S. Back, J. S. Cho, J. W. Ahn, D. Y. Yoon, and K. H. Cho, Desulfurization efficiency of lime absorbent in in-furnace desulfurization as fly ash binder in power plant, J. Korean Inst. Resour. Recycl., 27, 58-65 (2018). https://doi.org/10.7844/KIRR.2018.27.3.58
  13. J. X. LIU, Experimental study on desulfurization enhanced by additive in limestone-gypsum FGD process, Appl. Mech. Mater., 675, 422-425 (2014). https://doi.org/10.4028/www.scientific.net/AMM.675-677.422
  14. J. Yang, G. Hu, and H. Gao, Influence of operating parameters on performance of SO2 absorption in fulvic acid solution, Chem. Eng. J., 288, 724-738 (2016). https://doi.org/10.1016/j.cej.2015.12.037
  15. S. Liu, W. Xiao, P. Liu, and Z. Ye, Feasibility study of new limestone flue gas desulfurization process, Clean, 36, 482-487 (2008).
  16. L. Wang, Y. Ma, W. Zhang, Q. Li, Y. Zhao, and Z. Zhang, Macrokinetics of magnesium sulfite oxidation inhibited by ascorbic acid, J. Hazard. Mater., 258, 61-69 (2013). https://doi.org/10.1016/j.jhazmat.2013.04.018