|Table of Contents|

[1] Wang Chunbo, Liu Hongcai, Chen Liang,. Model of limestone calcination/sulfationunder oxy-fuel fluidized bed combustion [J]. Journal of Southeast University (English Edition), 2015, 31 (2): 238-243. [doi:10.3969/j.issn.1003-7985.2015.02.014]
Copy

Model of limestone calcination/sulfationunder oxy-fuel fluidized bed combustion()
富氧燃烧循环流化床中石灰石煅烧/硫化反应模型
Share：

Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:
31
Issue:
2015 2
Page:
238-243
Research Field:
Energy and Power Engineering
Publishing date:
2015-06-20

Info

Title:
Model of limestone calcination/sulfationunder oxy-fuel fluidized bed combustion
富氧燃烧循环流化床中石灰石煅烧/硫化反应模型
Author(s):
Wang Chunbo;  Liu Hongcai;  Chen Liang
School of Energy Power and Mechanical Engineering, North China Electric Power University, Baoding 071003, China
王春波;  刘洪才;  陈亮
华北电力大学能源动力与机械工程学院, 保定071003
Keywords:
oxy-fuel;  limestone;  simultaneous calcination/sulfation;  grain-micrograin model
富氧燃烧;  石灰石;  同时煅烧/硫化;  晶粒-微晶粒模型
PACS:
TK16
DOI:
10.3969/j.issn.1003-7985.2015.02.014
Abstract:
The characteristics of the simultaneous calcination/sulfation of limestone under oxy-fuel fluidized bed combustion were studied and compared with those of the sulfation of precalcined CaO. During the calcination stage, SO2 can react with product CaO and slow down the CaCO3 decomposition rate by the covering effect of the CaSO4 product. The sulfation rate of simultaneous calcination/sulfation is slower than that of precalcined CaO, but with a long enough sulfation time, the calcium conversion of simultaneous calcination/sulfation is higher than that of the precalcined CaO. A grain-micrograin model is established to describe the simultaneous calcination, sintering and sulfation of limestone. The grain-micrograin model can reflect the true reaction process of the calcination and sulfation of limestone in oxy-fuel fluidized bed combustion.
对富氧燃烧流化床下石灰石同时煅烧/硫化特性进行了研究, 并与CaO硫化特性进行了比较.在石灰石煅烧阶段, CaO与SO2反应生成CaSO4产物层覆盖在未煅烧CaCO3的外层, 降低了煅烧速率.同时煅烧/硫化过程中的硫化反应速率比CaO的硫化反应速率要缓慢, 但是经过足够长的反应时间后, 同时煅烧/硫化反应的钙转化率比CaO硫化反应的钙转化率要高.建立了一个包含石灰石同时煅烧、烧结和硫化反应的晶粒-微晶粒模型用于描述流化床内同时进行的石灰石煅烧、烧结和硫化过程, 实验证明所建立的模型能够反映流化床富氧气氛中石灰石的真实煅烧/硫化过程.

References:

[1] Liu H, Okazaki K. Simultaneous easy CO2 recovery and drastic reduction and NOxx in O2/CO2 coal combustion with heat recirculation[J]. Fuel, 2003, 82(11): 1427-1436.
[2] Liu Hao, Ren Ruiqi, Huang Yongjun, et al. Reduction and emission of NO in oxy-fuel system[J]. Journal of Chemical Industry and Engineering, 2011, 62(2): 495-501.(in Chinese)
[3] Duan Lunbo, Zhou Wu, Qu Chengrui, et al. SO2 emission from a coal-fired circulating fluidized bed combustor under O2/CO2 atmosphere[J]. Journal of Engineering Thermophysics, 2012, 33(1): 151-154.
[4] Baker E H. The calcium oxide-carbon dioxide system in the pressure range 1-300 atmopheres[J/OL]. Journal of the Chemical Society (Resumed), 1962:464-470.http://pubs.rsc.org/en/content/articlepdf/1962/jr/jr9620000464.
[5] Wang W Y, Bjerle I. Modeling of high-temperature desulfurization by Ca-based sorbents[J]. Chemical Engineering Science, 1998, 53(11): 1973-1989.
[6] Wang C, Jia L, Tan Y, et al. The effect of water on the sulfation of limestone[J]. Fuel, 2010, 89(9): 2628-2632.
[7] Stewart M C, Manovic V, Anthony E J, et al. Enhancement of indirect sulfation of limestone by steam addition[J]. Environmental Science and Technology, 2010, 44(22): 8781-8786.
[8] García-Labiano F, Rufas A, de Diego L F, et al. Calcium-based sorbents behaviour during sulfation at oxy-fuel fluidised bed combustion conditions[J].Fuel, 2011, 90(10): 3100-3108.
[9] Bhatia S K, Perlmutter D D. A random pore model for fluid-solid reactions: Ⅰ. Isothermal, kinetic control[J]. AIChE Journal, 1980, 26(3):379-386.
[10] Bhatia S K, Perlmutter D D. A random pore model for fluid-solid reactions: Ⅱ. Diffusion and transport effects[J]. AIChE Journal, 1981, 27(2):247-254.
[11] Bhatia S K, Perlmutter D D. The effect of pore structure on fluid-solid reactions: application to the SO2-lime reaction[J]. AIChE Journal 1981, 27(2):226-234.
[12] Szekely J, Evans J W. A structural model for gas-solid reactions with a moving boundary[J]. Chemical Engineering Science, 1970, 25(6):1091-1107.
[13] Hartman M, Coughlin R W. Reaction of sulfur dioxide with limestone and the grain model[J]. AIChE Journal, 1976, 22(3):490-498.
[14] Silcox G D, Kramlich J C. A mathematical model for the flash calcination of dispersed CaCO3 and Ca(OH)2 particles [J]. Industrial Engineering Chemistry Research, 1989, 28(2):155-160.
[15] Milne C R, Silcox G D, Pershing D W, et al. High-temperature, short-time sulfation of calcium-based sorbents. 1. Theoretical sulfation model[J]. Industrial Engineering Chemistry Research, 1990, 29(11): 2192-2201.
[16] Milne C R, Silcox G D, Pershing D W, et al. High-temperature, short-time sulfation of calcium-based sorbents.2. Experimental data and theoretical model predictions[J]. Industrial Engineering Chemistry Research, 1990, 29(11): 2201-2214.
[17] Mahuli S K, Agnihotri R, Jadhav R, et al. Combined calcination, sintering and Sulfation model for CaCO3 SO2 reaction[J]. AIChE Journal, 1999, 45(2): 367-382.
[18] Ghosh-Dastidar A, Mahuli S, Agnihotri R, et al. Ultrafast calcination and sintering of Ca(OH)2 powder:experimental and modeling[J]. Chemical Engineering Science, 1995, 50(13): 2029-2040.
[19] Agnew J, Hampartsoumian E, Jones J M, et al. The simultaneous calcination and sintering of calcium based sorbents under a combustion atmosphere[J]. Fuel, 2000, 79(12): 1515-1523.
[20] Borgwardt R H. Sintering of nascent calcium oxide[J]. Chemical Engineering Science, 1989, 44(1): 53-60.
[21] Lindner B, Simonsson D. Comparison of structural models for gas-solid reactions in porous solids undergoing structural changes[J]. Chemical Engineering Science, 1981, 36(9):1519-1527.
[22] Wang Chunbo, Zhang Yue, Jia Lufei, et al. Effect of water vapor on the pore structure and sulfation of CaO[J]. Fuel, 2014, 130: 60-65.
[23] Wang Chunbo, Wang Jinxing, Lei Ming, et al. Investigations on combustion and NO emission characteristics of coal and biomass blends[J].Energy & Fuel, 2013, 27(10): 6185-6190.

Memo

Memo:
Biography: Wang Chunbo(1973—), male, doctor, professor, hdwchb@126.com.
Foundation items: The National Natural Science Foundation of China(No.51276064), the Natural Science Foundation of Hebei Province(No.E2013502292).
Citation: Wang Chunbo, Liu Hongcai, Chen Liang. Model of limestone calcination/sulfation under oxy-fuel fluidized bed combustion[J].Journal of Southeast University(English Edition), 2015, 31(2):238-243.[doi:10.3969/j.issn.1003-7985.2015.02.014]
Last Update: 2015-06-20