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Your search keyword '"Nguyen, Hoang Khoi"' showing total 2 results
Start Over Author "Nguyen, Hoang Khoi" Topic carbon dioxide
2 results on '"Nguyen, Hoang Khoi"'

1. Carbon dioxide purity and combustion characteristics of oxy firing compared to air firing in a pilot-scale circulating fluidized bed

Author

Nguyen Hoang Khoi, Jae-Goo Lee, Sung-Ho Jo, Ho Won Ra, Ji-Hong Moon, Sung-Jin Park, Sang-Jun Yoon, Myung Won Seo, Tae-Young Mun, and Sung-Min Yoon

Subjects
Flue gas, Materials science, business.industry, 020209 energy, Mechanical Engineering, Test rig, Pilot scale, 02 engineering and technology, Building and Construction, Combustion, Pollution, Industrial and Manufacturing Engineering, chemistry.chemical_compound, General Energy, 020401 chemical engineering, chemistry, Carbon dioxide, 0202 electrical engineering, electronic engineering, information engineering, Fluidized bed combustion, 0204 chemical engineering, Electrical and Electronic Engineering, Process engineering, business, Civil and Structural Engineering
Abstract

This study aims to optimize the oxy-circulating fluidized bed combustion (oxy-CFBC) process by reducing the amount of flue gas with high-purity carbon dioxide. To achieve this, the stable transition from air mode to oxy mode is tested and validated in a 0.1-MW oxy-CFBC test rig. The results prove that flue gas carbon dioxide separation can achieve 96 vol% (dry) through a stable transition from air mode to oxy mode. Moreover, flue gas production emitted in oxy mode is reduced to one fifth compared to air mode. The proven technologies and oxy-fuel combustion database from this test rig operating experience can be used as empirical operating parameters for the next steps such as demonstration and commercial-scale operation.

Published
2019

2. Simultaneous reduction of nitrogen oxides and sulfur dioxide in circulating fluidized bed combustor during oxy-coal combustion.

Author

Baek, Geon-Uk, Nguyen, Hoang Khoi, Yoon, Sang Hee, Moon, Ji Hong, Jo, Sung Ho, Park, Sung Jin, Kim, Jae Young, Kim, Seong Ju, Yoon, Sang Jun, Ra, Ho Won, Yoon, Sung Min, Lee, Jae Goo, Lee, Kyu-bock, and Mun, Tae-Young

Subjects
*FLUIDIZED-bed combustion, *NITROGEN oxides, *SULFUR dioxide, *SULFUR oxides, *COMBUSTION, *CARBON sequestration, *CARBON dioxide
Abstract

For stable carbon capture utilization and storage, highly-pure CO 2 content and low pollutant emissions must be maintained throughout oxy-coal firing operation; however, studies on combining absorbent addition and oxidant staging combustion to eliminate simultaneous nitrogen oxides (NO, N 2 O) and sulfur dioxide (SO 2) have not been reported. Accordingly, the purpose of this study was to investigate the effects of oxidant staging and limestone addition on the reductions of NO, N 2 O, and SO 2 emissions in an oxy-circulating fluidized bed combustor at 25% and 31% input oxygen. The operating parameters considered in this study were: oxidant compositions; corresponding flow rate ratios; primary, secondary, and tertiary oxidants (PO, SO, and TO, respectively); TO supply heights; and limestone addition. The results revealed that compared to the TO supply heights, increasing TO flow rate was more effective at reducing the nitrogen oxide emissions. Under an optimal flow rate ratio (PO:SO:TO = 70:10:20) and TO height (6.4 m), NO, N 2 O, and SO 2 emissions were ≈7.4, 4.2 and 4.1 mg MJ−1, respectively. The increase in SO 2 emission caused by the application of oxidant staging could be effectively decreased by 60.6% without impacting combustion performance via limestone injection into the combustor; effectively facilitating the production of >86 vol% CO 2. These findings can serve as valuable references for future designs, and the efficient operation of oxy-coal combustion plants constructed at larger scales, thereby ensuring highly-pure CO 2 content and low pollutant emissions. • Explored staging combustion in oxy-circulating fluidized bed on emissions reductions. • Tertiary oxidant (TO) flow rate was more effective at reducing NO, N 2 O emissions. • Optimal ratio, TO height reduced NO, N 2 O, and SO 2 by 7.4, 4.2, and 4.1 mg MJ−1 • Limestone injection decreased SO 2 emissions by 60.6% without impacting performance. • Provides a valuable reference for future designs of oxy-coal combustion plants with the EHE. [ABSTRACT FROM AUTHOR]

Published
2022
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