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Title: Advanced separation technology for flue gas cleanup. Quarterly technical report No. 15

The objective of this work is to develop a novel system for regenerable SO{sub 2} and NO{sub x} scrubbing of flue gas that focuses on (1) a novel method for regeneration of spent SO{sub 2} scrubbing liquor and (2) novel chemistry for reversible absorption of NO{sub x}. In addition, high efficiency hollow fiber contactors (HFC) are proposed as the devices for scrubbing the SO{sub 2} and NO{sub x} from the flue gas. The system will be designed to remove more than 95% of the SO{sub x} and more than 75% of the NO{sub x} from flue gases typical of pulverized coal-fired power plants at a cost that is at least 20% less than combined wet limestone scrubbing of SO{sub x} and selective catalytic reduction of NO{sub x}. In addition, the process will make only marketable byproducts, if any (no waste streams). Our approach is to reduce the capital cost by using high efficiency hollow fiber devices for absorbing and desorbing the SO{sub 2} and NO{sub x}. We will also introduce new process chemistry to minimize traditionally well-known problems with SO{sub 2} and NO{sub x} absorption and desorption. For example, we will extract the SO{sub 2} from the aqueous scrubbing liquormore » into an oligomer of dimethylaniline to avoid the problem of organic liquid losses in the regeneration of the organic liquid. Our novel chemistry for scrubbing NO{sub x} will consist of water soluble phthalocyanine compounds invented by SRI and also of polymeric forms of Fe{sup ++} complexes similar to traditional NO{sub x} scrubbing media. Finally, the arrangement of the absorbers is in cassette (stackable) form so that the NO{sub x} absorber can be on top of the SO{sub x} absorber. This cassette (stacked) arrangement makes it possible for the SO{sub 2} and NO{sub x} scrubbing chambers to be separate without incurring the large ducting and gas pressure drop costs necessary if a second conventional absorber vessel were used.« less
Authors:
; ; ;  [1]
  1. and others
Publication Date:
OSTI Identifier:
245599
Report Number(s):
DOE/PC/91344--T16
ON: DE96011484; TRN: 96:003667
DOE Contract Number:
AC22-92PC91344
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: Feb 1996
Research Org:
SRI International, Menlo Park, CA (United States)
Sponsoring Org:
USDOE, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
20 FOSSIL-FUELED POWER PLANTS; 01 COAL, LIGNITE, AND PEAT; FLUE GAS; SCRUBBING; SULFUR DIOXIDE; AIR POLLUTION CONTROL; NITROGEN OXIDES; PHTHALOCYANINES; SORPTIVE PROPERTIES; ABSORPTION; COAL; COST; DESORPTION; PRESSURE DROP; IRON COMPLEXES; POLYMERS; SODIUM SULFATES; WASTE MANAGEMENT; REGENERATION; PROGRESS REPORT