采用可再生胺法脱除烟气中SO2

为加快可再生胺法脱硫工艺的工业化进程，开发了一套撬装式脱硫再生中试装置，通过SO2连续吸收解吸实验验证装置性能。分别考察吸收剂质量分数、pH、液气比（L/G）、解吸温度、SO2进口含量对吸收和解吸效率的影响，结果表明：随吸收剂质量分数、pH、液气比的增大吸收率升高，而解吸率下降；解吸温度升高，吸收率变化不大，解吸率增速较快；SO2进口浓度增大，吸收率和解吸率迅速降低。确定适宜工艺条件为：吸收剂质量分数30%，pH=6~8，吸收温度30℃，解吸温度（90±5）℃，液气比L/G=5.0 L·m-3。通过微分法导出体积总传质系数KGa的计算公式，并与相关工艺参数进行关联拟合，回归出填料吸收塔KGa经验模型：KGa=0.081（L/G）0.232 0（8.91 w0.107 3pH0.248e-0.32yA-1）。

Removal of SO2 in flue gas by regenerable amine process

To speed up industrialization of the regenerable amine sweetening process, a skid-mounted desulfurization and regeneration pilot device was developed. To test device performance, continuous SO2 absorption/desorption experiments were conducted. The effect of varying absorbent mass fraction, pH, liquid-gas ratio, desorption temperature, and SO2 inlet content on the absorption/desorption efficiency was investigated. The absorption rate increased with an increase in absorbent mass fraction, pH, and liquid-gas ratio, while the desorption rate decreased under these conditions. However, with an increase in desorption temperature, little effect was observed for the absorption rate, while a rapid growth in the desorption rate was observed. Furthermore, both the absorption and desorption rates decreased significantly with an increase in SO2 inlet content. The optimal conditions for this process were therefore as follows:30% absorbent mass fraction, pH 6-8, an absorption temperature of 30℃, a desorption temperature of (90±5)℃, and a liquid-gas ratio 5.0 L·m-3. To calculate the total volume of the mass transfer coefficient, KGa, the following mathematical expression was derived by differential methods to incorporate the relevant process parameters:KGa=0.081(L/G)0.232 0(8.91w0.107 3pH0.248e-0.32yA-1).