Abstract: By comparative study of mass transfer characteristics of high and low concentration H2S absorption, the volumetric overall mass transfer coefficient (KGa) for high and low concentration H2S removal from flue gas into aqueous solution of carbonate solution in a packing column was investigated. The KGa value was evaluated over ranges of liquid load, concentration of absorbent and gas flow by response surface methodological analysis based on Box-Behnken design. Two quadratic response surface models were respectively built for high and low concentration H2S absorption. The models demonstrated that the regularity of three impact factors on KGa were consistent. The liquid load was synergistic with concentration of absorbent. For 720 L/h low concentration H2S (2.16%, j), the maximum value of KGa was achieved when the liquid load was 11.28 L/h and concentration of absorbent 0.082 mol/L. For 720 L/h high concentration H2S (20.1%, j), the maximum value of KGa was achieved when the liquid load was 11.28 L/h and concentration of absorbents 0.764 mol/L.

Key words: packing column, H2S, absorption, overall mass transfer coefficient, response surface methodology

摘要： 采用Na2CO3溶液在填料塔中分别吸收高、低浓度H2S气体，通过测定总体积传质系数(KGa)，采用基于Box-Behnken设计的响应面分析方法研究吸收液流量、浓度和气体流量对KGa的影响，建立了Na2CO3溶液吸收高、低浓度H2S的二次响应曲面模型. 结果表明，在高、低H2S吸收体系中，各因素对KGa的影响规律基本一致，在低浓度H2S吸收体系中对KGa的影响更大. KGa与3个因素之间不是简单的单调函数关系，吸收液流量和浓度具有较强的相互增效作用. 处理H2S浓度为2.16%(j)、气体流量为720 L/h的体系时，当吸收液浓度为0.082 mol/L、其流量为11.28 L/h时，KGa最大；处理H2S浓度为20.1%(j)、气体流量为720 L/h的体系时，吸收液浓度为0.764 mol/L、其流量为11.28 L/h时，KGa最大.

关键词: 填料塔, H2S, 吸收, 总体积传质系数, 响应面法