Sequence valve opening and closing scheme optimization method for reducing steam flow exciting force

• Main Authors: LONG ZHENHUA, YANG MAOZHU, LI WENFENG, LIU XIN, LI LIYAN, LIU JINFU, LIU YUMING, WANG ZHONGBAO, WANG YONGGANG, YANG TIEQIANG, CHENG RAN
• Format: Patent
• Language: Chinese; English
• Published: 29.06.2021
• Subjects: BLASTING; ENGINE PLANTS IN GENERAL; HEATING; LIGHTING; MACHINES OR ENGINES IN GENERAL; MECHANICAL ENGINEERING; NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAMTURBINES; STEAM ENGINES; WEAPONS

The invention discloses a sequence valve opening and closing scheme optimization method for reducing steam flow exciting force, belongs to the technical field of steam turbines, and solves the problem that an existing steam turbine sequence valve opening and closing scheme is poor in safety or high in economic cost. Shaft vibration signals of a turboset are collected, when the amplitude of the shaft vibration signals exceeds a safety threshold value, a three-valve combination optimization adjustment strategy, a double-diagonal pre-opening strategy, a sequence valve pre-opening strategy, an optimization sequence valve strategy or a single/sequence valve combination strategy is adopted, the position of a high-pressure and medium-pressure rotor in a cylinder is changed through unbalanced steam flow force, the purpose of optimizing the through-flow gap is achieved, and the sealing exciting force and the blade top gap exciting force are reduced to the maximum extent. The invention is applicable in the technical fi