Pilot-plant technical assessment of wet flue gas desulfurization using limestone
Pilot-plant technical assessment of wet flue gas desulfurization using limestone
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DOI：
10.1021/ie051316o
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发表时间：
2006-02-15
影响因子：
4.2
通讯作者：
Giménez, A
中科院分区：
文献类型：
--
作者：
Ortiz, FJG;Vidal, F;Giménez, A
在逆流填料塔中试装置上进行了湿法烟气脱硫的试验研究。处理后的烟气的流速约为300 Nm（3）/h，因此，中试装置的容量是相对于其他已发表的中试装置湿法FGD研究最大的之一。在SO2入口浓度为2000 ppm时，通过将再循环浆料pH值改变为约4.8，L/G比改变为7.5 - 15，进行试验。三种类型的石灰石进行了测试，获得脱硫效率从59%到99%。我们显示了选择合适的石灰石的重要性，以获得更好的性能从FGD装置。因此，了解反应性（实验室规模）和吸附剂利用率（中试规模）非常重要，以便确定石灰石是否具有足够的反应性并将其与另一种类型进行比较。此外，通过使用传输单元的概念，已经得到了一个函数的脱硫效率，使用L/G比和循环浆液pH值作为独立变量。Ca/S摩尔比与这些和SO2去除效率相关。该函数与操作变量成本的简化函数一起，使我们能够确定配对（L/G比和pH），以实现以最小操作成本去除SO2的目标。最后，填料塔和喷雾洗涤器之间的可变操作成本进行了比较，作为基础的试点填料塔和工业喷雾塔在Compostilla发电厂的烟气脱硫厂（莱昂，西班牙）。
An experimental study was performed on a countercurrent pilot-scale packed scrubber for wet flue gas desulfurization (FGD). The flow rate of the treated flue gas was around 300 Nm(3)/h, so the pilot-plant capacity is one of the largest with respect to other published studies on a pilot-plant wet FGD. The tests were carried out at an SO2 inlet concentration of 2000 ppm by changing the recycle slurry pH to around 4.8 and the L/G ratio to between 7.5 and 15. Three types of limestone were tested, obtaining desulfurization efficiencies from 59 to 99%. We show the importance of choosing an appropriate limestone in order to get a better performance from the FGD plant. Thus, it is important to know the reactivity (on a laboratory scale) and the sorbent utilization (on a pilot-plant scale) in order to identify if a limestone is reactive enough and to compare it with another type. In addition, by using the transfer-unit concept, a function has been obtained for the desulfurization efficiency, using the L/G ratio and the recycle slurry pH as independent variables. The Ca/S molar ratio is related to these and to the SO2 removal efficiency. This function, together with a simplified function of the operation variable cost, allows us to determine the pair (L/G ratio and pH) to achieve the desired SO2 removal with the minimum operation cost. Finally, the variable operation costs between packed towers and spray scrubbers have been compared, using as a basis the pilot packed tower and the industrial spray column at the Compostilla Power Station's FGD plant (in Leon, Spain).