Abstract
The impact of operating parameters on H2S capture from a syngas mixture by a Mo-promoted Mn-based high-temperature sorbent was investigated. The parameters investigated included temperature, space velocity, H2S concentration in the feed gas, and steam content. The H2S and SO2 concentrations in the gas after passing over a bed of the sorbent were analyzed and compared with thermodynamic calculations. The results confirmed that low temperature, low space velocity, low H2S concentration, and a dry feed were favorable for achieving a low residual concentration of sulfur compounds in the effluent gas. The sorbent was able to reduce the residual H2S concentration to below 1 ppm under all tested conditions. However, the unavoidable steam content in the gas phase had a significant adverse effect on sulfur removal from the gas. An empirical model, containing the three variables, i.e., temperature, space velocity, and H2S concentration in the feed, was developed and can be used to predict the effluent H2S residual concentration after treatment by the 15Mn8Mo sorbent.
Highlights
It can be seen that more H2 S remained in the gas phase over MoO2 than over MnO with all applied initial H2 S concentrations, and the values over MoO2 are not sensitive to the initial H2 S partial pressures
The measured residual H2 S concentrations are generally lower than the calculated ones, as shown in Figure 1A, but increase with increasing temperature, which is in accordance with the theoretical calculation trend
Experimental values are lower than the calcu2 S levels increased temperature, which is in accordance with the equilibrium gas-phase residue obtained lated values
Summary
Undesired species and contaminants in the raw product of gasification can have severe detrimental effects on downstream processes [1]
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