Start-stop control method of gas-turbine generator set hydraulic barring device system

Abstract

The invention provides a start-stop control method of a gas-turbine generator set hydraulic barring device system. The method comprises the following steps: judging whether a barring device is released and delayed with a first preset time interval; if the barring device is released and delayed with the first preset time interval, comparing the rotation speed of a gas-turbine generator set rotor with a first preset rotation speed, if the rotation speed is greater than or equal to the first preset rotation speed, judging whether the rotation speed of a barring device gear is greater than a second preset rotation speed, and if the rotation speed of the barring device gear is greater than the second preset rotation speed, judging whether the difference between the rotation speed of the barring device and the rotation speed of the gas-turbine generator set rotor is less than a low limit value; if the difference is less than the low limit value, judging whether the difference is between a high limit value and the low limit value, and if the difference is between the high limit value and the low limit value, judging whether the barring device is engaged; if the barring device is engaged, judging whether the rotation speed of the gas-turbine generator set rotor is greater than the first preset rotation speed and an instruction is delayed with a second preset time interval; and if not, sending an instruction of increasing the opening degree of a flow electromagnetic valve of the barring device.

Description

technical field [0001] The invention relates to gas turbine generating set technology, in particular to a start-stop control method for a hydraulic cranking system of a gas turbine generating set. Background technique [0002] The gas turbine hydraulic barring device is a driving device that drives the shaft system to rotate before the gas turbine generator set starts and after it stops. The gas turbine hydraulic barring device is generally installed outside the end cover of the gas turbine compressor bearing seat, and is composed of a casing, a hydraulic motor, a hydraulic cylinder, a compression spring, a gear set, a pivot arm, a solenoid valve, a limit switch, and a speed sensor. Use top shaft oil as power source. The hydraulic motor converts oil pressure into torque, which drives the gears to rotate. The driven gear is mounted on the pivot arm and meshes with the gear. The pivot arm can swing back and forth driven by a hydraulic cylinder or a compression spring, so th...

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Problems solved by technology

[0015] pass figure 1 The hydraulic cranking system of the gas turbine generator set shown can control the operation of the hydraulic cranking device of the gas turbine (including start and stop), but in the prior art, it is impossible to drive the hydraulic cranking device of the gas turbine to drive the rotor of the gas turbine from a static state to cranking. stable speed; and when the gas turbine rotor speed is higher than the gas turbine hydraulic barring device gear speed, the gas turbine hydraulic barring device cannot be disengaged in time and decelerates to zero speed; in addition, when the gas turbine rotor is idling from a high-speed state, the gas turbine hydraulic disc The cranking device cannot start in time and engage the rotor until successful cranking

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