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首页> 外文期刊>Environmental Science & Technology >Effect of operating parameters and reactor structure on moderate temperature dry desulfurization
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Effect of operating parameters and reactor structure on moderate temperature dry desulfurization

机译：操作参数和反应器结构对中温干法脱硫的影响

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摘要

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.
机译：在中试规模的循环流化床烟气脱硫（CFB-FGD）实验设备中研究了600-800摄氏度的中温干法脱硫工艺。研究了各种操作参数（例如床温，CO2浓度和固体浓度）的脱硫效率。另外，对CFB-FGD系统的关键部分即旋风分离器和分配器进行了结构上的改进，以提高脱硫效率和流动阻力。实验结果表明，由于气体扩散的增加​​和碳酸盐反应平衡的偏移，脱硫效率随温度升高至600摄氏度以上而迅速增加。吸附剂快速碳化后，吸附剂逐渐硫酸化，需要较长的颗粒停留时间以实现高脱硫率。床中固体浓度的降低减少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。与风帽式分配器相比，大孔分配器降低了流阻，这归因于降低的床压降和恶化的床流化作用，从而降低了脱硫效率。通过提高细颗粒的收集效率以延长其停留时间，并通过改善固体浓度分布以增加气固接触表面积，可以提高脱硫效率。

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