Attrition of limestone during fluidized bed calcination and sulfation

doi:10.11949/0438-1157.20190335

Abstract

Abstract:

Attrition characteristics of limestone has a significant effect on material balance and SO₂ capture efficiency in circulating fluidized beds. A bubbling reactor system, equipped with a particle separation apparatus and mass spectrum analyzer, was used to investigate the mutual influence between the calcination and sulfation reactions and the limestone attrition under different conditions. The results showed that sulfation reaction would be significantly reduced the attrition rate, delaying the time for reaching to the stable attrition rate. As the sulfation reaction progressed, the outer surface layer of a CaO particle was gradually covered by CaSO₄. After the initial fast reaction finished, the attrition rates of limestone tended to be stable. Attrition would remove the impervious sulfate layers and enhance the sulfation conversion. Besides, the attrition rate decreased with the increasing sulfation conversion at the same reaction condition. Finally, using the existing literature data to analyze and verify the limestone attrition model, it can better reflect the difference in attrition rate of limestone with different particle sizes.

Key words: fluidized bed, model, limestone, chemical reaction, attrition, sulfur dioxide

摘要：

石灰石磨耗特性对于循环流化床物料平衡和脱硫效率有重要影响。利用鼓泡床磨耗实验台，系统地研究了不同煅烧与硫化条件下，粒径、温度和SO₂浓度对石灰石及其脱硫产物的磨耗速率的影响。实验结果表明，硫化反应会显著降低石灰石的磨耗速率，延迟到达稳定磨耗的时间；当硫化反应达到慢反应区时，脱硫产物磨耗速率趋于稳定。磨耗可以剥离颗粒表层CaSO₄，从而提高脱硫剂转化率。相同反应条件下，脱硫产物钙转化率越高，石灰石磨耗速率越低。最后利用现有文献数据分析并验证了石灰石磨耗模型，能够较好地反映不同粒径石灰石的磨耗速率的差异。

关键词: 流化床, 模型, 石灰石, 化学反应, 磨耗, 二氧化硫

CLC Number:

X 701.3

Runxia CAI, Yiqun HUANG, Lu CHENG, Dongfang LI, Chung-hwan JEON, Hairui YANG, Junfu LYU, Man ZHANG. Attrition of limestone during fluidized bed calcination and sulfation[J]. CIESC Journal, 2019, 70(8): 3086-3093.

蔡润夏, 黄逸群, 程璐, 李东方, 杨海瑞, 吕俊复, 张缦. 石灰石煅烧与硫化条件下磨耗特性[J]. 化工学报, 2019, 70(8): 3086-3093.

Figures/Tables 13

Fig.1 Experimental apparatus for attritions of limestone

Fig.2 Particle size distribution of silica sand

Table 1 Experimental parameters of attritions of limestone

变量	参数
温度 /℃	800,850,900
SO₂浓度φ(SO₂) /%	0.1, 0.2
粒径(d ₅₀/d ₃₂)/μm	346.2/320.4,609.7/586.4
反应条件	仅煅烧不硫化，先煅烧后硫化，同时煅烧和硫化

Fig.3 Time variation of attrition rate of lime and its sulfide product (320 μm, φ(SO2)=0.2%)

Fig.4 Time variation of SO2 and CO2 under simultaneous calcination and sulfation (320 μm)

Fig.5 Sulfation conversion versus time under different calcination conditions (320 μm, φ(SO2)=0.2%)

Fig.6 Energy spectrum analysis (EDS) of sulfur element of attrition particles at different time (simultaneous calcination and sulfation, 320 μm, φ(SO2)=0.2%)

Fig.7 Effects of SO2 concentration on attrition rate (simultaneous calcination and sulfation, 320 μm)

Fig.8 Effects of SO2 concentration on sulfation conversion (simultaneous calcination and sulfation, 320 μm)

Fig.9 Effects of temperature on attrition rate (simultaneous calcination and sulfation, 320 μm, φ(SO2)=0.2%)

Fig.10 Effects of particle size on attrition rate (simultaneous calcination and sulfation, 850℃, φ(SO2)=0.2%)

Fig.11 Effects of particle size on sulfation conversion (simultaneous calcination and sulfation, 850℃，φ(SO2)=0.2%)

Fig.12 Prediction of attrition rate constant of limestones with different particle sizes

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