Combined SO{sub 2}/NO{sub x} removal in the ThioNO{sub x} process

Conference · Tue Dec 31 04:00:00 EST 1996

OSTI ID:549612

Tseng, S; Babu, M ^[1]

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1. Dravo Lime Co., Pittsburgh, PA (United States)

The ThioNO{sub x}{reg_sign} process under development by Dravo Lime Company (DLC) is a post-combustion multi-pollutant control technology. It can simultaneously remove SO{sub 2} and NO{sub x} from boilers burning high-sulfur coals. In this process, SO{sub 2} is removed by scrubbing the flue gas with slaked Thiosorbic{reg_sign} lime (a magnesium-enhanced lime) slurry. The removal of NO{sub x} is achieved by adding to the scrubbing liquor iron-EDTA, a metal chelate, which binds and removes NO from the flue gas. This process is an attractive option for utility stations already equipped with wet scrubbers to reduce SO{sub 2} emissions. Extensive efforts have been devoted to analyzing the data generated at the bench and pilot plant levels. This leads to the development of a scale-up model, which is derived from two fundamental equations governing the absorption of SO{sub 2} and NO in the scrubber. A set of data obtained from a bench test was used to illustrate the effectiveness of this model. This model has been proved to be highly valuable in data interpretation and correlation. It is also a powerful tool to guide the test program and for scale up applications.

• OSTI ID: 549612
• Report Number(s): CONF-960954--
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
20 FOSSIL-FUELED POWER PLANTS
ABSORPTION
CALCIUM OXIDES
CHELATING AGENTS
COMBINED SOXNOX PROCESSES
EDTA
MATHEMATICAL MODELS
SCRUBBERS