F - Mech Eng,Light,Heat,Weapons – 01 – K
Patent
F - Mech Eng,Light,Heat,Weapons
01
K
F01K 7/38 (2006.01) F01D 17/02 (2006.01)
Patent
CA 2588879
The steam turbine plant includes an extraction system 3 (3a, 3b) which extracts a portion of main steam from an intermediate stage of a steam turbine 1 and delivers the extracted steam to a demander 8 and a steam extraction control system 7 for controlling the steam extraction. The extraction system includes an extraction steam flowmeter 5 (5a, 5b) and an extraction steam stop valve 6 (6a, 6b). The control system can set a warning flow and an extracted steam stop flow as restrictive flow values with respect to a flow of the extracted steam. When an extracted steam flow measurement value from the flowmeter reaches the warning flow, a warning is issued and after a lapse of a predetermined time period the stop valve is brought into a fixed open state for restriction of the extracted steam flow. When in the restriction state the extracted steam flow is further increased and the extracted steam flow measurement value reaches the extracted steam stop flow, the stop valve is fully closed for stoppage of steam extraction. With such features, a steam turbine plant can exercise extraction control capable of stably supplying extracted steam while it is primarily intended that the turbine can continuously be operated by avoiding occurrence of the turbine trip due to steam extraction even if it is not equipped with a high- performance and expensive valve device such as an extraction steam control valve and adopts high-pressure steam condition.
Koizumi Naoto
Onuma Masanori
Hitachi Ltd.
Kirby Eades Gale Baker
LandOfFree
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