A simulation method for load rejection with a 150 kW class radial inflow steam turbine system was proposed to determine over rotational speed at load rejection. Simulations were carried out for several parameters of valves which are operated in an emergency. In addition, load rejection tests were carried out to confirm the machine reliability and to obtain results for comparison with the simulation results. Simulation results show that operation delay times of the steam release and vacuum break valves greatly affect over rotational speed at load rejection. Load rejection tests were done for generator outputs from 69 kW to 113 kW. Maximum over rotational speed of 54,160 rpm was measured at the generator output of 113 kW. Over rotational speed calculated by the dynamic simulation has relatively good agreement with the result for the operation delay time of 0.21 s. If the operation delay time of the steam release valves are kept as 0.21 s at the load rejection for the rated load of 150 kW, the over rotational speed is suppressed within 55,200 rpm which is less than the allowed rotational speed of 56,100 rpm.

References

References
1.
Nakano
,
S.
,
Tsubouchi
,
K.
,
Shiraiwa
,
H.
,
Hayashi
,
K.
, and
Yamada
,
H.
,
2010
, “
A 150 kW Radial Inflow Steam Turbine System for the Bottoming Cycle of Reciprocating Engines
,”
ASME
Paper No. GT2010-23231. 10.1115/GT2010-23231
2.
Hayashi
,
K.
,
Shiraiwa
,
H.
,
Yamada
,
H.
,
Nakano
,
S.
, and
Tsubouchi
,
K.
,
2011
, “
150 kW Class Two-Stage Radial Inflow Condensing Steam Turbine System
,”
ASME
Paper No. GT2011-46192. 10.1115/GT2011-46192
3.
Takahashi
,
K.
,
Nagafuchi
,
N.
,
Saito
,
N.
, and
Nanataki
,
K.
,
2010
, “
Dynamic Simulations for Designing Emergency Procedures for a Gas Turbine Power Plant
,”
Proceedings of the Future of Gas Turbine Technology 5th International Conference
, Brussels, Belgium, October 27–28.
4.
Bozzi
,
L.
,
Crosa
,
G.
, and
Trucco
,
A.
,
2003
, “
Simplified Simulation Block Diagram of Twin-Shaft Gas Turbines
,”
ASME
Paper No. GT2003-38679. 10.1115/GT2003-38679
5.
Panov
,
V.
,
2009
, “
GasTurboLib: Simulink Library for Gas Turbine Engine Modelling
,”
ASME
Paper No. GT2009-59389. 10.1115/GT2009-59389
6.
Shapiro
,
A. H.
,
1953
,
The Dynamics and Thermodynamics of Compressible Fluid Flow
, Vol. 1,
The Ronald Press Company
,
New York
.
7.
Nakano
,
S.
,
Kishibe
,
T.
,
Inoue
,
T.
, and
Shiraiwa
,
H.
,
2009
, “
An Advanced Microturbine System With Water-Lubricated Bearings
,”
Int. J. Rotating Mach.
,
2009
, p.
718107
. 10.1155/2009/718107
8.
Schlichting
,
H.
,
1968
,
Boundary Layer Theory
,
McGraw-Hill
,
New York
.
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