Desulfurization and Denitration of Flue Gas by Semi-coke Base Sorbent
Sulfur dioxide and nitrogen oxides could result in serious environmental problems, but the approaches of wet flue gas desulfurization for DeSO2 and selective catalytic reduction for DeNOx are not usually installed in china, due to financial and technical constraints. Therefore, a cost-effective and high efficiency technology is in urgent demand.
To remove SO2/NOx in one process and with the same sorbent at low temperature, an industrial waste, semi-coke, was utilized to prepare the semi-coke based sorbent. After the activation and modification, the semi-coke could have excellent physicochemical properties. And it also has the ability of regeneration with ease.
In this paper, sulfur dioxide and nitrogen oxide, balanced with N2, were employed to evaluate the DeSO2 and DeNOx activity of the semi-coke based sorbent in a tubular reactor. Some primary factors were intensively investigated to ascertain their influence on the flue gas cleaning capability of the sorbent. It was found that alkali modification could improve the gas cleaning effect. And loading metal oxide species had great influence on DeSO2 capacity of the semi-coke based sorbent while only slight influence on DeNOx. The results also shown that the sorbent exhibited good DeSO2 and DeNOx performance, if only SO2 or NO was employed in model flue gas (SO2-O2-N2 or NO-O2-N2), respectively. However, the DeNOx capacity would decreased significantly whereas DeSO2 was improved, when SO2 and NO coexisted in model flue gas.