Effect of operating parameters and reactor structure on moderate temperature dry desulfurization.
Effect of operating parameters and reactor structure on moderate temperature dry desulfurization.
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DOI：
10.1021/es052168w
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发表时间：
2006-07
影响因子：
11.4
通讯作者：
Jie Zhang;Changfu You;H. Qi;B. Hou;Chang-he Chen;Xuchang Xu
中科院分区：
文献类型：
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作者：
Jie Zhang;Changfu You;H. Qi;B. Hou;Chang-he Chen;Xuchang Xu
在中试循环流化床烟气脱硫（CFB-FGD）实验装置上研究了600-800 ℃的中温干法脱硫工艺。脱硫效率的各种操作参数，如床层温度，CO2浓度，和固体浓度进行了研究。此外，还对CFB-FGD系统的关键部位，并对旋风分离器和分布器进行了改进，提高了脱硫效率和流动阻力。实验结果表明，在600 ℃以上，随着温度的升高，由于气体扩散的增强和碳酸盐反应平衡的移动，脱硫效率迅速提高。吸附剂在快速碳酸化后逐渐硫酸化，需要较长的颗粒停留时间以实现高的脱硫率。床层中固体浓度的降低降低了颗粒的停留时间和脱硫效率。与两级旋风分离器相比，单级旋风分离器的脱硫效率没有提高。与风帽式分布器相比，大孔分布器减小了流动阻力，降低了床层压降，恶化了床层流化，降低了脱硫效率。提高细颗粒的捕集效率，延长其停留时间，改善颗粒浓度分布，增加气固接触表面积，可以提高脱硫效率。
A moderate temperature dry desulfurization process at 600-800 degrees C was studied in a pilot-scale circulating fluidized bed flue gas desulfurization (CFB-FGD) experimental facility. The desulfurization efficiency was investigated for various operating parameters, such as bed temperature, CO2 concentration, and solids concentration. In addition, structural improvements in key parts of the CFB-FGD system, i.e., the cyclone separator and the distributor, were made to improve the desulfurization efficiency and flow resistance. The experimental results show that the desulfurization efficiency increased rapidly with increasing temperature above 600 degrees C due to enhanced gas diffusion and the shift of the equilibrium for the carbonate reaction. The sorbent sulfated gradually after quick carbonation of the sorbent with a long particle residence time necessary to realize a high desulfurization ratio. A reduced solids concentration in the bed reduced the particle residence time and the desulfurization efficiency. A single-stage cyclone separator produced no improvement in the desulfurization efficiency compared with a two-stage cyclone separator. Compared with a wind cap distributor, a large hole distributor reduced the flow resistance which reduced the desulfurization efficiency due to the reduced bed pressure drop and worsened bed fluidization. The desulfurization efficiency can be improved by increasing the collection efficiency of fine particles to prolong their residence time and by improving the solids concentration distribution to increase the gas-solid contact surface area.