Method for Improving the Safe and Stable Operation of the Pumped-Back Steam Turbine Unit System

Abstract

The invention relates to a method for lifting the safe and stable operation of the pumping-back steam turbine unit system. The steam turbine of the unit system includes a high-medium pressure outer cylinder and a high-pressure inner cylinder. The cylinder is a double-layer cylinder structure. , high-pressure steam chamber, medium-pressure steam chamber, two sets of baffles, front seal and rear seal. The cylinder warming pipeline is added externally, and the cylinder warming operation is performed first to ensure that the steam turbine can be successfully started once and smoothly connected to the grid for power generation; the invention can realize a successful grid connection for power generation every time it is started, and the unit runs stably and can realize full-load operation. During operation, the unit All parameters are good, which greatly improves the company's power generation efficiency.

Description

technical field [0001] The invention relates to a method for improving the safe and stable operation of a withdrawing-back steam turbine unit system. Background technique [0002] The steam turbine is a double-cylinder, single-shaft, impulse, steam-extraction and back-pressure steam turbine. The cylinder of this steam turbine is a double-layer cylinder structure. The high and medium pressure outer cylinder is equipped with high pressure inner cylinder, high pressure steam chamber, medium pressure steam chamber, two sets of partition sets, front steam seal and rear steam seal, etc. The flow part consists of 13 pressure levels and 2 adjustment levels composition. [0003] There are deficiencies in unit design. There are mainly three problems: [0004] 1. The thermal expansion curve of the steam turbine does not conform to the design. Every time it is started in a cold state, it will trip due to the large expansion difference, and the steam turbine generator set cannot be co...

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Problems solved by technology

[0004] 1. The thermal expansion curve of the steam turbine does not conform to the design. Every time it is started in a cold state, it will trip due to the excessive expansion difference, and the steam turbine generator set cannot be connected to the grid for power generation.

External heat supply can only be reduced through double reduction, which seriously affects the stability of production and economic benefits

[0005] 2. The 1# steam turbine with a load above 7MW and the 2# steam turbine with a load above 24MW all produce abnormal noises, and the high-frequency vibration of the cylinder block affects the safety of the unit and cannot realize high-load operation

The steam pressure of the steam turbine unit is 13.24MPa, and the steam temperature is 535°C. The high-frequency vibration of the cylinder body will cause the bolts of the cylinder body to loosen, the pipe joints will rupture due to vibration, and the pressure gauge will burst, resulting in high-temperature and high-pressure steam leakage, which seriously threatens the safety of people and equipment, and affects normal operation. Production

[0006] 3. The steam leakage at the shaft seal position of the high-pressure end of the steam turbine is serious, polluting the lubricating oil of the unit, causing failure or damage to thermal components, and even causing burns to personnel

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