Numerical Study of Heat Transfer Characteristics in High Pressure Steam Turbine During Stop Unit Process with Sliding Pressure

Budi Santoso, Bambang Arip Dwiyantoro

Abstract


During maintenance of the turbine and its auxiliary equipment, which requires a stop of the turbine oil system equipment and an open turbine casing, the first stage metal temperature requirement must be below 150°C. The normal stop unit method with natural cooling takes about 14 to 17 days. In order to speed up the cooling time to 5 days, a forced cooling turbine is needed using the stop unit method with sliding pressure. The heat transfer that occurs in the high-pressure turbine during the stop unit process with sliding pressure was investigated using the numerical method of CFD simulation. The 2D geometry design was made from high-pressure turbine cutouts images. Then meshing was made. The solver stage and the post-processing stage were set. The simulation was running in a steady state and followed by transients. The validation method was to compare the first stage metal temperature parameter between the actual process and the results of the CFD simulation at a load of 350 MW, then re-simulate it at 500 MW and 645 MW. The stop unit process with sliding pressure starting at 645MW resulted in the best final cooling compared to the stop unit at 500 MW and 350MW loads. By increasing the main steam flow, the resulting cooling increases. By increasing the value of the fluid flow velocity, the Reynolds number increases, so the convection heat coefficient also increases.


Keywords


First stage metal temperature; stop unit; sliding pressure

Full Text:

PDF

References


China National Technical Import & Export Corporation, Training Manual for PLTU 2 Jateng 1x660MW Adipala Cilacap (Steam Turbine Part), 2013.

Shanghai Electric Power Generation Equipment Corporation, General Description and Operation Manual of Steam Turbine (Doc No.78.A192-1E), 2010.

Shanghai Electric Power Generation Equipment Corporation, Steam Turbine (Doc No.87.A192-07) Steam Turbine (Doc No.87.A192-07), 2011.

PLN Unit Pendidikan dan Pelatihan Suralaya, Modul 2 Pengoperasian Turbin Uap dan Alat Bantu. Suralaya.

W. Kosman, “Feasibility study of forced cooling of a supercritical steam turbine after a shut down of a power generating unit,” Archives of Thermodynamics, vol. 32, no. 3, pp. 201–214, 2011.

M. Bryk, T. Kowalczyk, P. Ziółkowski, and J. Badur, “The thermal effort during marine steam turbine flooding with water,” in AIP Conference Proceedings, vol. 2077, p. 020009, AIP Publishing LLC, 2019.

B. Lou and S. Zhong, “Simulating the temperature field of steam turbine with the rapid hot air cooling method,” in Power and Energy Engineering Conference, 2010.

G. Marinescu, P. Stein, and M. Sell, “Natural cooling and startup of steam turbines: Validity of the over-conductivity function,” Journal of Engineering for Gas Turbines and Power, vol. 137, no. 11, 2015.

China National Technical Import & Export Corporation, Training Manual for PLTU 2 Jateng 1x660MW Adipala Cilacap (Operation Central Control Room part), 2016.

China National Technical Import & Export Corporation, Construction Drawing (A192.00.00-1.4E04 Turbine Assy Long Section), 2012.




DOI: http://dx.doi.org/10.12962/j25807471.v6i2.12048

Creative Commons License
JMES The International Journal of Mechanical Engineering and Sciences by Lembaga Penelitian dan Pengabdian kepada Masyarakat (LPPM) ITS is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.
Based on a work at https://iptek.its.ac.id/index.php/jmes.