TY - GEN
T1 - Numerical Study for the Modified Cooler of SAF Motor at Power Plant
AU - Huda, Khoirul
AU - Prabowo,
AU - Dwiyantoro, Bambang Arip
AU - Widjayanto, Teguh
N1 - Publisher Copyright:
© 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.
PY - 2022
Y1 - 2022
N2 - At a power plant with a capacity of 2 × 110 MW with Circulating Fluidized Bed (CFB) boiler type, the air supplier for boiler combustion involves three equipment, namely primary air fan, secondary air fan, and high-pressure fluidizing fan. Secondary air fan is driven by a 6 kV motor that is cooled by a cooler with shell and tube type where the shell side is hot air due to electric heat from winding and the tube side is cold air taken from the ambient and flowed by an external fan. The problem was high winding temperature while operated at high load. The winding temperature has a limit from 130 ℃ (alarm) until 140 ℃ (trip), while at that time the wind was about 120 ℃, this closed to limit and still had a risk. At the first time, experimental modifications were made to the cooler to obtain better cooling performance by adjusting the external guide plate to reduce the number of the tube. The CFD numerical analysis was carried out to find an optimum model to analyze the geometry of tubes inlet, velocity inside tubes, especially to Tout shell side, q˙ (heat transfer rate), NTU, and ε (effectiveness). In the end, we obtained that in model 75% was better than model 100%. Tout shell side decreased, and q˙ (heat transfer rate) increased. This result was due to lower flow maldistribution at 75% model than the existing model (100% model), so thus proving that the final 75% model with uniform airflow had a better cooling performance.
AB - At a power plant with a capacity of 2 × 110 MW with Circulating Fluidized Bed (CFB) boiler type, the air supplier for boiler combustion involves three equipment, namely primary air fan, secondary air fan, and high-pressure fluidizing fan. Secondary air fan is driven by a 6 kV motor that is cooled by a cooler with shell and tube type where the shell side is hot air due to electric heat from winding and the tube side is cold air taken from the ambient and flowed by an external fan. The problem was high winding temperature while operated at high load. The winding temperature has a limit from 130 ℃ (alarm) until 140 ℃ (trip), while at that time the wind was about 120 ℃, this closed to limit and still had a risk. At the first time, experimental modifications were made to the cooler to obtain better cooling performance by adjusting the external guide plate to reduce the number of the tube. The CFD numerical analysis was carried out to find an optimum model to analyze the geometry of tubes inlet, velocity inside tubes, especially to Tout shell side, q˙ (heat transfer rate), NTU, and ε (effectiveness). In the end, we obtained that in model 75% was better than model 100%. Tout shell side decreased, and q˙ (heat transfer rate) increased. This result was due to lower flow maldistribution at 75% model than the existing model (100% model), so thus proving that the final 75% model with uniform airflow had a better cooling performance.
KW - Cooler
KW - Flow maldistribution
KW - Motor
UR - http://www.scopus.com/inward/record.url?scp=85135931979&partnerID=8YFLogxK
U2 - 10.1007/978-981-19-1581-9_21
DO - 10.1007/978-981-19-1581-9_21
M3 - Conference contribution
AN - SCOPUS:85135931979
SN - 9789811915802
T3 - Lecture Notes in Electrical Engineering
SP - 189
EP - 195
BT - Recent Advances in Renewable Energy Systems - Select Proceedings of ICOME 2021
A2 - Kolhe, Mohan
A2 - Muhammad, Aziz
A2 - El Kharbachi, Abdel
A2 - Yuwono, Tri Yogi
PB - Springer Science and Business Media Deutschland GmbH
T2 - 5th International Conference on Mechanical Engineering, ICOME 2021
Y2 - 25 August 2021 through 26 August 2021
ER -