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ADVACATE -- LOW-COST PROCESS FOR SO2 CONTROL
Citation:
Jozewicz, W., B. Hall, C. Singer, AND C. Sedman. ADVACATE -- LOW-COST PROCESS FOR SO2 CONTROL. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/A-92/286 (NTIS PB93141117), 1992.
Description:
The paper discusses sorbent chemistry and process chemistry of the ADVAnced siliCATE (ADVACATE) process, a simple, low-cost add-on technology for S02 control, easily retrofitted on existing utility boilers with minimal disruption. It is considered to be capable of removing 90% of S02 at a Ca/S stoichiometry of 1.0 and at less than half the cost of a typical wet scrubber. The sorbent is produced by atmospheric (normally 90 C) slurring of Ca(ON)2 and fly ash, as a source of silica. Alternate sources of silica (e. g., diatomaceous earth, bentonic or montmorillonic clay, sand, and waste glass) were also found to promote the formation of high surface area, highly reactive materials. Recycle and slurry mixing have been incorpor- ated into the process to achieve simultaneous flue gas humidification and enhanced S02 absorption. The unit operation of mixing slurry with recycle solids has shown the feasibility of mixer operation with production of solids containing up to 50% moisture. aste glass-based silicates have particular application to control of acid-gas emissions from waste incinerators. Potential improvements over conventional acid- gas controls are discussed.
