PMID- 37273608
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20230606
IS  - 2470-1343 (Electronic)
IS  - 2470-1343 (Linking)
VI  - 8
IP  - 21
DP  - 2023 May 30
TI  - Numerical Optimization on Char Conversion and NOx Emission under Various 
      Operating Conditions in a Retrofit Biomass Boiler.
PG  - 18530-18542
LID - 10.1021/acsomega.3c00264 [doi]
AB  - Retrofitting retirement or existing fossil boiler with biomass is an important 
      method of curbing electricity shortage and lowering the cost of modern power 
      plants. However, the use of biomass combustion is hampered by operational 
      problems, such as the resulting high unburned carbon, amount of bottom ash, and 
      nitrogen oxide (NOx) release. In this study, we investigated the burning of 
      pulverized biomass in a retrofitting boiler power plant using computational fluid 
      dynamics of commercial software fluent ANSYS to determine the optimal combustion 
      conditions. The objective of this study was to investigate a 125 MWe pulverized 
      biomass boiler that was retrofitted from an anthracite down-fired boiler. The air 
      distribution, including the influence of the secondary air ratio and the location 
      of the burner standby, was evaluated. Key factors such as biomass ash mass at the 
      hopper, char conversion, and high zone temperature relating to NOx 
      formation/reduction were calculated. The adjustment of the secondary air ratio 
      from 30 to 50% of the total air and the mass ash at the hopper significantly 
      decreased to a low value at 247 kg/h and a high value of char conversion at 
      97.33% in case R (SA40%). The standard deviation temperature was 240 K at the BNR 
      B-A level for case R, which was significantly lower than in other cases. This 
      implies that the best mixing of air and biomass occurs in case R at 40%. 
      Comparative analysis of the burner standby conditions showed that the NOx 
      emission was similar at the boiler outlet (approximately 94-116 ppm). Burner A on 
      standby, with a secondary air ratio of 40%, was used as the optimal case with the 
      highest value of char conversion at 98.43%, the lowest bottom ash release of 204 
      kg/h, and a low-NOx emission of 106 ppm.
CI  - (c) 2023 The Authors. Published by American Chemical Society.
FAU - Trinh, Viet Thieu
AU  - Trinh VT
AD  - School of Mechanical Engineering, Pusan National University, 2, Busandaehak-ro 63 
      beon-gil, Geumjeong-gu, Busan 46241, Republic of Korea.
AD  - School of Mechanical Engineering, Hanoi University of Science and Technology, No 
      1, Dai Co Viet, Hai Ba Trung, Hanoi 10000, Vietnam.
FAU - Lee, Byoung-Hwa
AU  - Lee BH
AD  - Pusan Clean Energy Research Institute, Pusan National University, 2, 
      Busandaehak-ro 63 beon-gil, Geumjeong-gu, Busan 46241, Republic of Korea.
FAU - Kim, Seung-Mo
AU  - Kim SM
AD  - Pusan Clean Energy Research Institute, Pusan National University, 2, 
      Busandaehak-ro 63 beon-gil, Geumjeong-gu, Busan 46241, Republic of Korea.
FAU - Jeon, Chung-Hwan
AU  - Jeon CH
AUID- ORCID: 0000-0001-8186-3323
AD  - School of Mechanical Engineering, Pusan National University, 2, Busandaehak-ro 63 
      beon-gil, Geumjeong-gu, Busan 46241, Republic of Korea.
AD  - Pusan Clean Energy Research Institute, Pusan National University, 2, 
      Busandaehak-ro 63 beon-gil, Geumjeong-gu, Busan 46241, Republic of Korea.
LA  - eng
PT  - Journal Article
DEP - 20230518
PL  - United States
TA  - ACS Omega
JT  - ACS omega
JID - 101691658
PMC - PMC10233701
COIS- The authors declare no competing financial interest.
EDAT- 2023/06/05 13:04
MHDA- 2023/06/05 13:05
PMCR- 2023/05/18
CRDT- 2023/06/05 11:49
PHST- 2023/01/13 00:00 [received]
PHST- 2023/05/11 00:00 [accepted]
PHST- 2023/06/05 13:05 [medline]
PHST- 2023/06/05 13:04 [pubmed]
PHST- 2023/06/05 11:49 [entrez]
PHST- 2023/05/18 00:00 [pmc-release]
AID - 10.1021/acsomega.3c00264 [doi]
PST - epublish
SO  - ACS Omega. 2023 May 18;8(21):18530-18542. doi: 10.1021/acsomega.3c00264. 
      eCollection 2023 May 30.