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Dry Sorbent Injection of Sodium Sorbents for SO2, HCl and Mercury Mitigation

[+] Author Affiliations
Yougen Kong, Heidi Davidson

Solvay Chemicals Inc., Houston, TX

Paper No. NAWTEC18-3560, pp. 317-320; 4 pages
doi:10.1115/NAWTEC18-3560
From:
  • 18th Annual North American Waste-to-Energy Conference
  • 18th Annual North American Waste-to-Energy Conference
  • Orlando, Florida, USA, May 11–13, 2010
  • Conference Sponsors: Solid Waste Processing Division and Environmental Engineering Division
  • ISBN: 978-0-7918-4393-2 | eISBN: 978-0-7918-3868-6
  • Copyright © 2010 by ASME

abstract

Solid waste incinerators emit air pollutants such as SO2 , HCl, and mercury. Dry sorbent injection of sodium sorbents has emerged as an important SO2 , HCl, and mercury mitigation technology due to its (a) low capital cost; (b) small installation foot print; (c) ease of operation; and (d) flexibility to fuel changes. In a dry sorbent injection system, trona or sodium bicarbonate is injected directly into hot flue gas. After injection, the sorbent is calcined into porous sodium carbonate that reacts with acid gases (SO2 , HCl and SO3 ). This technology is able to achieve high removal rates for HCl (>99%) and SO2 (>90%), and has been implemented at many waste incinerators in Europe and coal-fired power plants in the United States. With the promulgation of MACT rules, this technology will be a low-cost and easy-to-use option for waste-to-energy boiler owners.

Copyright © 2010 by ASME
Topics: Sorbents , Sodium

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