Pilot-Scale Study on Composite Fluidization Mode in Semidry FGD with Circulating Fluidized Beds

Abstract:

Difficulties such as deviation of flow field, ununiformity of axial velocity and temperature often appeared in semidry FGD with circulating fluidized beds. These caused lower desulfurization efficiency and were important reasons for particles adhering to wall. The composite fluidization mode of swirl-once through flow in DCFB-FGD was applied in a 145MW unit to the difficulties. As a result, uniformity of axial velocity and temperature for composite fluidization mode in the experimental diameters are better than that of traditional venturi fluidization mode. Desulfurization efficiency of composite fluidization mode is increased with Ca/S molar ratio increased and approach to adiabatic saturation temperature decreased. The desulfurization efficiency can be higher than 90% at lower Ca/S molar ratio and higher approach to adiabatic saturation temperature. System can operates stable for long time with a little phenomena of particles adhering to wall. So it suits the request of the semidry FGD with circulating fluidized beds and has better foreground. Introduction

• Periodical: Advanced Materials Research (Volumes 233-235)
• Pages: 920-925
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.233-235.920
• Online since: May 2011
• Authors: Xiao Wen Hao, Chun Yuan Ma, Hong Liang Ma
• Keywords: Composite Fluidization Mode, Gas Desulfurization, Uniformity, Venturi Fluidization Mode

References

[1] Gerald H. Newton, Modeling the SO2-slurry droplet Reaction, A IChE Journal, Vol. 36 (1990), pp.1865-1872.

[2] James K., and Neathery, Model for flue gas desulfurization in a circulating dry scrubber, A IChE Journal, Vol. 42 (1996), pp.259-268.

DOI: 10.1002/aic.690420123

[3] J. Yerushalmi, and N. T.Cankurt, Further studies of the regimes of fluidization, Powder Teehnol., Vol.24 (1979), pp.187-205,.

DOI: 10.1016/0032-5910(79)87036-9

[4] Bai D., Y. Jin, Z.-Q. Yu., and J.-X. Zhu, The axial distribution of the Cross-sectionally Averaged Voidage in Fast Fluidized Beds, Powder Technol., vol. 71 (1992), pp.51-58.

DOI: 10.1016/0032-5910(92)88003-z

[5] Hao Xiao-wen, Ma Chun-yuan, Wang Chun-bing, and Zhang Li-qiang, Experimental Study of Two-phase Flows in a Circulating Fluidized Bed under a Rotating and Straight Compound Fluidization, Journal of Engineering for Thermal Energy and Power. vol. 23 (2008), pp.620-624. In Chinese.

[6] Hu Jin-bang, Li Yan-ping, Chen An-xi, and Li Jin-long, Effect of the venturi inlet configuration on gas flow in circulating fluidized bed desulfurization reactor-numerical simulation, Chemical Engineering, vol. 33 (2005), pp.20-23. In Chinese.

[7] Qi Zhang, and Keting Guia, A novel semidry flue gas desulfurization process with the magnetically fluidized bed reactor, Journal of Hazardous Materials. Vol. 168 (2009), pp.1341-1345.

DOI: 10.1016/j.jhazmat.2009.03.019

[8] F.F. Hill, and J. Zank, Flue gas desulphurization by spray dry absorption. Chem. Eng. Process, vol.39 (2000), pp.45-52.

DOI: 10.1016/s0255-2701(99)00077-x

[9] Fabrizio Scala, Michele D'Ascenzo, and Amedeo Lancia F, flue gas desulfurization by spray-dry absorption, Sep. Purif. Technol. Vol.34 (2004), pp.143-153.

DOI: 10.1016/s1383-5866(03)00188-6

[10] Chen-Yeon Chu, Kuang-Wei Hsueh, and Shyh-Jye Hwang, "Sulfation and attrition of calcium sorbent in a bubbling fluidized bed". Hazard. Mater, vol. 80 (2000),pp.119-133.

DOI: 10.1016/s0304-3894(00)00290-9

[11] E.Spyridon, and Papadakis, Air Temperature and Humidity Profiles in Spray Drying. Ind. Eng, Chem. Res., vol. 27 (1988), pp.2111-2116.

DOI: 10.1021/ie00083a026

[12] Zhao Xudong, Wu Shaohua, Ma Chunyuan, and Qin Yukun, Experimental Research and Analysis of Overwet Phenomenon in Flue Gas Desulfurization for Circulating Fluidized Bed Power Engineering, vol. 22 (2002), pp.1815-1818. In Chinese

[13] Zhao Xudong, Xiang Guangming, Yao Qqiang, and Ma Chunyuan, Analysis of scaling on absorber wall of CFB-FGD system and its mechanism, Journal of Chemical Industry and Engineering, vol. 57 (2006), pp.397-402. In Chinese

[14] Yunyi Liu, and Kunio Kato, Process analysis of semidry desulfurization process in power-particle spouted bed . chem. Eng., vol. 33 (2000), pp.223-231.

DOI: 10.1252/jcej.33.223