Patent Number: 6,309,996

Title: Suspension carbonation process for reactivation of partially utilized sorbent

Abstract: A novel process has been developed for reactivation of partially utilized calcium-based sorbents for increased SO.sub.2 removal and sorbent utilization from coal-fired boilers/combustors. Spent sorbent and combustor ash samples are treated under specific conditions to modify their internal structure and expose the under utilized calcium for further SO.sub.2 capture. The reactivated sorbent shows significant improvement in utilization, increasing from less than 45% to nearly 100% utilization. Application of novel reactivation process to ash samples obtained from a circulating fluidized bed combustor also show marked improvement in utilization of available calcium, nearly doubling the amount of sulfur captured. The reactivation process involves carbonation of the unsulfated calcium. Better redistribution and exposure of the available calcium by the carbonation reactivation process, as compared to reactivation via hydration, is proposed as the main factor in increasing the sorbent utilization. The increased ultimate sorbent utilization obtained by this reactivation process could significantly improve the sorbent-based flue gas desulfurization technology.

Inventors: Fan; Liang Shih (Columbus, OH), Agnihotri; Rajeev (Columbus, OH), Mahuli; Suhas K. (Columbus, OH)

Assignee: The Ohio State University

International Classification: B01J 20/34 (20060101); B01J 20/30 (20060101); B01J 20/04 (20060101); B01J 020/34 (); B01J 020/00 ()

Expiration Date: 10/30/2018