Auxiliary steam intermediate pressure cylinder starting method for steam turbine

Abstract

Provided is an auxiliary steam intermediate pressure cylinder starting method for a steam turbine. The method comprises the steps of arranging pipelines, vacuumizing the steam turbine, starting a high pressure cylinder backward warming valve, conducting impulse starting on the steam turbine, conducting a dynamic balance test, a no-load test and an electrical test on a unit shaft system and conducting unit grid-connection and initial load loading. By means of system modification and logical configuration mode changing, intermediate pressure cylinder steam turbine impulse starting is conducted by means of auxiliary steam, and an electric generator no-load stage test is completed. Due to the fact that a boiler participates in the starting process of the steam turbine when the boiler is not subjected to ignition, starting and stopping of the steam turbine are flexible, no-load operation is not limited by time, and the defect that the steam turbine is poor in low-load adaptability in high pressure cylinder and intermediate pressure cylinder starting modes is avoided. Furthermore, the starting cost is reduced, a cylinder is heated uniformly, and the safety of the starting process of the steam turbine is greatly improved.

Description

technical field [0001] The invention relates to a method for starting an auxiliary steam medium-pressure cylinder of a steam turbine, belonging to the technical field of electric boilers. Background technique [0002] The default starting method of the DCS control system is the joint start of high and medium pressure cylinders, which has poor adaptability to low loads, and the running of the steam turbine is restricted by the need to start the boiler, especially when the steam turbine needs to be dealt with for a long time due to potential defects to extend the no-load running time Or the unit is frequently started, and the combined start-up equipment of the machine and furnace is heavily operated, resulting in a large amount of energy and manpower waste, increasing the start-up cost and prolonging the total start-up period. In addition, during the high-parameter start-up process, the thermal shock of the cylinder is large, and the life of the unit is lost. Contents of the...

AI Technical Summary

Problems solved by technology

[0002] The default starting method of the DCS control system is the joint start of high and medium pressure cylinders, which has poor adaptability to low loads, and the running of the steam turbine is restricted by the need to start the boiler, especially when the steam turbine needs to be dealt with for a long time due to potential defects to extend the no-load running time Or the unit is started frequently, and the combined start-up equipment of the machine and furnace is large in operation, resulting in a large amount of energy and manpower waste, increasing the start-up cost and prolonging the total start-up period

In addition, in the process of starting with such high parameters, the thermal shock of the cylinder is large, which will reduce the life of the unit

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