Rotational speed control method in gas turbine stopping process

F - Mech Eng,Light,Heat,Weapons – 02 – C

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F02C 9/00 (2006.01) F01D 21/06 (2006.01) F02C 9/46 (2006.01)

Patent

CA 2283862

Stress occurring in moving blade in gas turbine stopping process is decreased. Where time t1 is load decrease start or fuel throttling start, time t2 is no load operation start, time t3 is fuel. shut-off and time t4 is time of largest stress, (a) 4/4 load until t1 decreases gradually to 0/4 load at t2 to be kept until t3 and then decreases further, (b) rotational speed is rated one until t2 to be then controlled to be decreased gradually to about 60% of the rated rotational speed at t3, (c) metal temperature with differential temperature between moving blade point A and platform point B is constant until t1 to be then decreased slightly between t1 and t2 and between t2 and t3, and differential temperature .DELTA. t , which is largest after t3, occurs at t4, and (d) stress occurring in moving blade, while decreasing between t1 and t3, becomes largest at t4 by effect of centrifugal force and thermal stress, but as the rotational speed is decreased to about 60% of the rated rotational speed at t3 and the metal temperature is also decreased as compared with prior art, influence of centrifugal force and differential temperature is decreased, thereby stress occurring in the moving blade is mitigated.

L'invention concerne un procédé de contrôle de vitesse de révolution dans un processus d'arrêt de turbine à gaz, qui permet de réduire la contrainte exercée sur une palette en mouvement. (a) On maintient une charge en charge 4/4 jusqu'à l'instant t1 auquel démarre le réglage de débit du combustible, puis on réduit la charge jusqu'au niveau de charge 0/4 à l'instant t2, et on maintient l'état de charge nulle jusqu'à l'instant t3 où l'alimentation en combustible est coupée, puis la diminution se poursuit. (b) On maintient une vitesse de révolution à un niveau déterminé jusqu'à l'instant t2 auquel le niveau de charge 0/4 est atteint, puis la réduction de vitesse commence à l'instant t2, et un contrôle permet de réduire la vitesse à environ 60 % de la vitesse déterminée, à l'instant t3. (c) On maintient constantes les températures du métal en un point A d'une plate-forme et un point B de la palette mobile, lesquelles sont légèrement différentes; ces températures diminuent quelque peu entre les instants t2 et t3, ce qui donne un écart de température maximum DELTA t à l'instant t4 durant la diminution qui suit l'instant t3. (d) La contrainte exercée sur une palette mobile diminue entre les instants t1 et t3, atteint un seuil maximum à l'instant t4 en raison de la force centrifuge et d'une contrainte thermique, mais une libération de la contrainte intervient car la force centrifuge diminue suite à la réduction à 60 % de la vitesse de révolution entre les instants t2 et t3, moyennant quoi la température diminue et la contrainte résultante maximum diminue également.

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