Experimental Study on Reactivity of Limestone in FGD System

Abstract:

The limestone collected from the Ji county of Tianjin was investigated in this study. The characterization of the limestone dissolution in wet FGD system is carried out by sulfuric acid titration. The results indicate that A lower PH value is benefit for the limestone dissolution, which causes high dissolution rate within short time. Smaller particle size results in higher dissolution rate. The addition of inorganic salt and organic acid significantly affect the limestone dissolution. The limestone dissolution rate increases with the increase of organic acid concentration. In all the inorganic salt, it is obvious that Na⁺ has an positive effect while CI^- plays a negative role on the limestone dissolution. However, the addition of composite additive of adipic acid plus MgO to the limestone slurry is greatly better than using the adipic acid or MgO only.

• Periodical: Advanced Materials Research (Volumes 875-877)
• Pages: 1702-1706
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.875-877.1702
• Online since: February 2014
• Authors: Wan Peng Zhang, Mei Yan Wang, Xiu Qin Ma, Chao Huang, Fang Chen, Cheng Liang Jia
• Keywords: Additive, Flue Gas Desulfurization, Limestone, Reactivity

References

[1] Rochelle G T and Weems W. Buffer additives for limestone slurry scrubbing[A]. ACS symposium series[C] Washington D C: American Chemical Society, 1982, 188.

DOI: 10.1021/bk-1982-0188.ch012

[2] Frandsen B W. Optimization of a wet FGD pilot plant using fine limestone and organic acids [J]. Chemical Engineering science, 2001, 56: 3275-3287.

DOI: 10.1016/s0009-2509(01)00010-0

[3] Ahlbeck J, Engman T, Falten S and Vihma M. A method for measuring the reactivity of absorbents for wet flu desulfurization[J]. Chem. Eng. Sci, 1993, 48(20): 3479-3484.

DOI: 10.1016/0009-2509(93)85003-8

[4] Ahlbeck J, Engman T, Falten S and Vihma M. A method for measuring the reactivity of absorbents for wet flue desulfurization[J]. Chem. Eng. Sci, 1995, 50(7): 1081-1089.

DOI: 10.1016/0009-2509(94)00482-7

[5] Shih S M, Lin J P and Shiau G Y. Dissolution rates of limestone of different sources [J].J. Hazardous Materials B, 2000, 79(1): 159-171.

DOI: 10.1016/s0304-3894(00)00253-3

[6] Ukawa N, Takashina T, Oshima M. Effects of salts on limestone dissolution rate in wet limestone flue gas desulfurization [J]. Environment Progress, 1993, 12, (4): 294-299.

DOI: 10.1002/ep.670120410

[7] Li Y P, Tan T E and Jing G H. Effects of salts on pH of SO2-H2O-CaC03 reaction system [J]. Environmental pollution and control, 1997, 19(5): 1-5.

[8] Wu Z B, She S Q and Mo J S. Experimental study of desulfurization process with limestone slurry enhanced by hexanedioic acid [J]. Journal of Chemical Engineering of Chinese Universities, 2003, 17(5): 540-544.

[9] Mobley J D and Cassidy M. Organic acids can enhance wet limestone flue gas scrubbing[J]. Power Engineering, 1986, 24(6): 32-35.

[10] Mobley J D and Chang C S. The adipic acid enhance limestone flue gas desulfurization process: An assessment[J]. Journal of the air Pollution Control Association, 1981, 31(12): 1249-1253.

DOI: 10.1080/00022470.1981.10465353

[11] Hu J B, Hu L L, Duan Z Y and Chen Z Q. Progress of additives for wet FGD process[J]. Chemical Industry and Engineering, 2005, 22（6）: 456-460.