Rapid pre-warming starting system and method for power plant steam turbine

Abstract

The invention relates to a rapid pre-warming starting system for a power plant steam turbine. The power plant steam turbine of the system at least comprises an operating adjacent machine and a nativemachine needing to be rapidly pre-warmed and started, the native machine comprises a high-pressure cylinder, first, the high-pressure cylinder is connected with a heater through a steam pipeline and asteam inlet control valve, second, the high-pressure cylinder is output to a native machine condenser through a main steam pipeline, a steam guiding pipe and a steam exhaust pipeline, and a steam guiding pipe steam-exhaust control valve, and third, the high-pressure cylinder is also connected to the native machine condenser after passing through the steam exhaust pipeline and a warming cylinder steam-exhaust control valve; and the heater further inputs coming steam of the adjacent machine after passing through the steam pipeline and a heating steam source coming-steam control valve, native machine auxiliary steam is input through the steam pipeline and a coming steam control valve, and the auxiliary steam is output to a next-stage heater of the adjacent machine through the steam pipeline,is output to a drain tank through the steam pipeline, and then output to the native machine condenser through the steam exhaust pipeline and a heater drain control valve. According to the rapid pre-warming starting system, the starting time of the cold starting process of the steam turbine can be effectively shortened, and the starting time length is lowered from 6.5-8 hours to be within 1 hour.

Description

technical field [0001] The invention relates to a fast warm-up start-up system for a steam turbine in a power plant. The present invention also relates to a fast warm-up start-up method for a steam turbine in a power plant based on the above-mentioned system. Background technique [0002] At present, the starting methods of steam turbines in power plants in the domestic electric power industry generally adopt several methods of starting medium pressure cylinders, starting high pressure cylinders, or combining high and medium pressure cylinders. However, no matter which method is used to start, the high-pressure cylinder (some units also require the medium-pressure cylinder) needs to be preheated before the steam turbine starts. That is, the superheated steam of the auxiliary steam system is introduced into the high-pressure cylinder of the steam turbine to heat the temperature of the outer wall of the high-pressure cylinder to above 150°C, so as to ensure that the high- and...

AI Technical Summary

Problems solved by technology

The time from the cold state of the steam turbine (the temperature of the outer wall of the high-pressure inner cylinder is lower than 320°C) to the grid connection of the generator is generally 6.5 to 8 hours. The duration is long, the operation is complicated, and the startup process before grid connection consumes a lot of energy, resulting Reduced energy efficiency of plant units

Images