Study Of Nano-MgO Adsorbent Regeneration And The Mechanism Of Simultaneous Desulfurization And Denitrification

The Nano-MgO adsorbent has good performance of simultaneous desulfurization and denitrification, however, the activity of adsorbent and the removal efficiency will reduce with a long-time use. There is need to regenerate the adsorbent. In the stuy, the best method of Nano-MgO adsorbent regeneration is found through comparing with many ways and the adsorption mechanism of simultaneous desulfurization and denitrification is analyzed.Lye regeneration was the best method compared with hot regeneration and steam regeneration. The final conclusion was to immerse the adsorbent with 100ml NaOH of 0.25mol/L for 30 minutes. The bed height setting is 5 centrimetre with the performance of simultaneous desulfurization and denitrification through the self-designed equipment. The results showed that the removal efficiencies of SO2 and NOx increased with the temperature becoming higher. The Nano-MgO adsorbent could be regenerated repeatedly. The efficiency of simultaneous desulfurization and denitrification was higher after regenerating with lye. In order to approach the practical production,a self-designed adsorption-regeneration integration was set to removal SO2 and NOx continuously in the stuy.Through the determination results of simultaneous desulfurization and denitrification by Nano-MgO adsorbent, BET, SEM and XRD, the conclusion was found that physical adsorption and chemical adsorption were included in process of simultaneous desulfurization and denitrification, the chemical adsorption was dominant. An array of chemical reactions were happened complicatedly between SO2, NOX and adsorbent. There were alkaline functional groups which were beneficial to the removal of SO2 and NOx producted in the surfaces of adsorbent through immersing in the lye. Catalysis might exist in the process, which further improved the removal efficencies of SO2 and NOx. Another reason was that specific surface area of adsorbent was larger after regeneration.The stuy showed that Nano-MgO adsorbent could be regenerated repeatedly, but the adsorption-regeneration integration needed farther improvement. In addition, there was more stuy of recycling needed because it could not recovery SO2 and NOx as the sort of dilute sulfuric acid and dilute nitric acid in the way of lye regeneration.