Thermal start-up control method of steam turbine in trough solar thermal power station

Abstract

This application relates to the technical field of start-up control of steam turbines, in particular to a method for temperature-state start-up control of steam turbines in trough-type solar thermal power plants, which includes: when the shaft seal is put into operation, delay the start-up time of the shaft plus fan, and when the low-pressure cylinder When the pressure of the shaft seal rises to 5KPa, start the shaft adding fan; the temperature of the steam supplied to the shaft seal is controlled to be 20-25°C higher than the temperature of the high-pressure cylinder to ensure the superheat of the steam supplied to the shaft seal; The compressed air source of the oil gear is withdrawn, and it is re-introduced after the steam turbine is connected to the grid; when the warm state is started, the temperature of the shaft seal behind the high-pressure cylinder is controlled at 160-175°C; When controlled below ‑0.2mm. This application has the effect of being able to solve the temperature start-up stability of the new unit of the domestic trough-type photothermal power station, ensure the smooth start-up of the new-type steam turbine, and meet the use requirements of the new-type steam turbine of the trough-type photothermal power station.

Description

technical field

[0001] The present application relates to the technical field of start-up control of steam turbines, and in particular, to a method for controlling the temperature-state start-up of steam turbines in trough solar thermal power plants. Background technique

[0002] CGN Delingha 50MW trough CSP plant is the first one in China. The steam turbine is the first model in China with two cylinders, two speeds, high pressure, medium temperature, and axial exhaust. At present, the domestic conventional steam turbine warm-up technology is relatively mature. , but there are many problems to be solved in the warm start-up of the first new type of unit in China.

[0003] When the new-type steam turbine is in the warm state, the vibration of the rear bearing of the high-pressure cylinder reaches the shutdown value when it exceeds the critical speed region, and the new-type steam turbine cannot be started normally in the warm state. The high-pressure cylinder vibration shutd...