- Title
- Conceptual design of a packed bed for the removal of SO₂ in oxy-fuel combustion prior to compression
- Creator
- Liu, Dunyu; Xiong, Zhibo; Jin, Jing; Wall, Terry; Stanger, Rohan
- Relation
- International Journal of Greenhouse Gas Control Vol. 53, Issue October 2016, p. 65-78
- Publisher Link
- http://dx.doi.org/10.1016/j.ijggc.2016.07.031
- Publisher
- Elsevier
- Resource Type
- journal article
- Date
- 2016
- Description
- Flue gas cooler (FGC) is commonly used in Oxy-fuel projects for cooling the flue gas as well as removing most of its moisture and SO₂. Due to enriched CO₂ concentration in the flue gas, sodium tends to be wasted as NaHCO₃, and the design of the column needs to consider both the effective use of sodium solutions and SO₂ absorption rate. Conceptual design on a packed bed was carried out to determine the column diameter, column height, L/G ratio and initial solution pH. Kinetic modelling was used for the design of packed bed. Results indicate that SO₂ absorption into NaHCO₃ is accompanied by significant formation of HSO₃⁻ and minor formation of SO₃²⁻; CO₂ absorption is accompanied by the initial accumulation of dissolved CO₂ until saturation and desorption of CO₂ afterwards. In the CO₂ desorption region, the desorption rate of CO₂ is close to the absorption rate of SO₂. A higher initial pH results in higher discharged pH and HCO₃⁻ in liquid while a lower pH leads to a significant increase in the column height. The optimum initial pH can be determined by the best uniformity of pH along the column. This results in a discharged pH ranging from 5.13 to 5.91 and agrees with the operational pH range of 5–6 from our previous steady state experiments. The influence of L/G ratio is primarily on the liquid phase mass transfer coefficient and secondarily on the interfacial wetted area. A higher L/G ratio results in a shorter column height but a higher HCO₃⁻ concentration. Therefore, the L/G ratio should be optimized based on both reasonable column height and HCO₃⁻ concentration. Overall, this paper sheds light on the design of the scrubber for the treatment of SO₂ from Oxy-fuel combustion.
- Subject
- conceptual design; packed bed; SO₂ removal; oxy-fuel combustion
- Identifier
- http://hdl.handle.net/1959.13/1331234
- Identifier
- uon:26570
- Identifier
- ISSN:1750-5836
- Language
- eng
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