浸渍活性炭脱除低质量浓度H_2S性能的研究

Investigation of removal of low concentration hydrogen sulfide on impregnated activated carbon

浸渍法制备了Na2CO3浸渍活性炭(IACⅠ)和一种高效脱硫剂(IACⅡ)。通过测定低质量浓度H2S在固定床上的穿透曲线,比较了原活性炭(AC)、IACⅠ和IACⅡ的脱硫效果。考察了原料气相对湿度,H2S质量浓度对穿透过程的影响。建立了固定床反应器一维轴向扩散模型模拟脱硫穿透曲线,并进行了数值求解。通过模型计算与实验测量穿透曲线拟合,确定了有效扩散系数等参数。结果表明,IACⅡ的脱硫效果最佳,其有效扩散系数较IACⅠ有所提高。提高相对湿度有利于增大硫容,但有效扩散系数略有降低。随着H2S入口质量浓度升高,有效扩散系数增大,穿透变快,硫容略有降低。

Sodium carbonate impregnated activated carbon （IAC Ⅰ ） and another highly effective desulphurization agent （ IAC Ⅱ ） were made by impregnation. To compare the ability of AC, IAC Ⅰ and IAC Ⅱ for removal of hydrogen sulfide, the breakthrough curves for removal of low concentration nES on fixed bed were measured. The effects of relative humidity and inlet concentrations on the removal process were investigated. To simulate the breakthrough curves a one -dimension model for fixed beds was developed and numerically solved. The effective diffusion coefficients of nES were evaluated by fitting the experiment breakthrough curves with the calculated ones. The results show that IAC Ⅱ has the best performance, and its effective diffusion coefficient is higher than that of IAC Ⅰ. Higher relative humidity is of benefit to improve the sulfur capacity, but the effective diffusion coefficients decrease slightly. With the increasing of inlet n2 S concentrations, the effective diffusion coefficients increase, the breakthrough time gets shorter and the sulfur capacity decreases slightly.