Screening of Zinc-Based Sorbents for Hot-Gas Desulfurization

Abstract

Highly reactive and attrition-resistant ZnO-based sorbents that are suitable for bubbling fluidized-bed reactors can be produced using the spray-drying method. Most of the ZnO-based sorbents prepared here (ZAC-X, X ) 18N-25N) satisfy the physical and chemical criteria for bubbling fluidized-bed application [spherical shape, average particle size, 90-110 µm; size distribution, 40-230 µm; bulk density, 0.9-1.0 g/mL; attrition index (AI), 40-80%; sulfur sorption capacity, 14-17 wt %; sorbent use, 70-80%]. The performance test of the ZAC-C sorbent at Korea Institute of Energy Research (KIER) with a bubbling fluidized-bed for 70 h also demonstrated that it had good sulfidation and regeneration performance (11 wt % sorption capacity and 52% sorbent use) as well as reasonable attrition resistance (1.1% attrition loss for 70 h).

Investigation on the Cause of the SO2 Generation during Hot Gas Desulfurization (HGD) Process

“…Although numerous studies on desulfurization are being conducted, there are few studies on SO 2 generation during desulfurization. In addition, the reason for SO 2 generation is still unknown [18][19][20]. There are some studies reporting that the formation of SO 2 is due to the reaction between the side products (ZnSO 4 ) of the desulfurization and H 2 O [21][22][23][24][25][26][27].…”

Integrated Dynamic and Steady State Method and Its Application on the Screening of MoS2 Nanosheet-Containing Adsorbents for Hg0 Capture

“…Normally, the development of new materials for environmental applications is remarkably time-consuming. The initial screening method is therefore crucial, and considerable efforts have therefore been devoted to develop methods for CO 2 capture materials, , CO hydrogenation catalysts, zinc-based desulfurization sorbents, − and so on. However, not much work has been conducted to develop methods for the screening of novel materials for mercury removal.…”

Highly Attrition-Resistant Zinc Oxide-Based Sorbents for H2S Removal by Spray-Drying Technique

“…The overall objective of this project is the development of a superior attrition-resistant zinc oxide-based sorbent for hot gas cleanup in the integrated coal gasification combined cycle (IGCC). Sorbents applicable to the fluidized-bed hot gas desulfurization process must have a high attrition resistance to withstand the fast solid circulation between desulfurizer and regenerator, fast kinetic reactions, and high sulfur-sorption capacity. – The oxidative regeneration of zinc oxide-based sorbents is usually initiated at temperatures greater than 600 °C and has a highly exothermic nature that causes the deactivation of the sorbent as well as complicates the sulfidation process with side reactions.…”