A direct contact cooler design for simultaneously recovering latent heat and capturing SOx and NOx from pressurized flue gas
- Washington University, St. Louis, MO (United States); OSTI
- 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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