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Title: A direct contact cooler design for simultaneously recovering latent heat and capturing SOx and NOx from pressurized flue gas

Journal Article · · Energy Conversion and Management
 [1];  [2];  [2]
  1. Washington University, St. Louis, MO (United States); OSTI
  2. Washington University, St. Louis, MO (United States)

Integrated SOx and NOx removal technology using a direct contact cooler is a promising alternative for cleaning coal combustion flue gas, especially for pressurized combustion systems. Past investigations of integrated SOx and NOx removal have been limited to low-temperature processes, where the flue gas has been cooled upstream of the removal unit, and the moisture in the flue gas has been condensed out. Here this work presents a novel design that recovers the flue gas heat while simultaneously removing SOx and NOx in a single reactive-absorption column – direct contact cooler. A validated model was used to evaluate different direct contact cooler designs. Modeling results suggested that a counter-current column with a single water inlet can scrub 83% of the NOx and 96.5% of the SOx in 115 s, while an optimized design with multiple water inlets enhances the scrubbing of NOx by 9 percentage points and SOx by 3.5 percentage points, due to a 34% increase in residence time. It is also observed that the liquid-phase reaction between absorbed SOx and NOx plays a significant role in the removal of SO2 from the flue gas for high-temperature scrubbing compared with low-temperature scrubbing. The design reinforces the potential of high-temperature SOx-NOx removal and heat recovery and suggests a means of reducing capital costs for such columns.

Research Organization:
Washington University, St. Louis, MO (United States); West Virginia University, Morgantown, WV (United States)
Sponsoring Organization:
USDOE Office of Fossil Energy (FE); U.S.-China Clean Energy Research Center (CERC); Consortium for Clean Coal Utilization (CCCU)
Grant/Contract Number:
FE0025193; PI0000017
OSTI ID:
1977088
Journal Information:
Energy Conversion and Management, Journal Name: Energy Conversion and Management Journal Issue: C Vol. 254; ISSN 0196-8904
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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