Small steam turbine high-pressure steam source rotationimpulsing method and control system thereof

Abstract

The invention provides a small steam turbine control system which is a DCS control system. The small steam turbine control system comprises an MEH control unit used for signal collecting, program control and automatic adjusting of a small steam turbine, the MEH control unit is internally provided with a PID controller, a forced feed forward part and a forced assignment circuit, and field apparatuses originally connected to a black box controller are connected into the MEH control unit. The invention further provides a small steam turbine high-pressure steam source rotationimpulsing method. Themethod comprises the steps that the preparation state is adjusted, a high-pressure gas source is connected, and the rotationimpulsing speed change rate A of the small steam turbine is set; the forcedrotation speed change rate B out of critical zone is set; the proportion coefficient of the PID controller is set to be x, the integration coefficient is set to be y, and the differential feedforwardcoefficient is set to be z; the rotation speed of the steam turbine is gradually increased at the speed A till the rotation speed reaches the critical point of the steam turbine; the speed A is replaced with the forced speed B, the rotation speed is increased to be out of the critical zone; the speed A is recovered, the rotation speed of the steam turbine is increased to 3000 rpm, and rotationimpulsing is completed; and an isolated low-pressure gas source is slowly released, and the system enters the steady-state regulation mode.

Description

technical field [0001] The invention belongs to the technical field of power generation equipment, and in particular relates to the steam source revolving technology of a small steam turbine. Background technique [0002] The existing equipment is a small turbine product in the 1990s. The steam source of the small turbine is divided into two parts: low-pressure steam source and high-pressure steam source. The low-pressure steam source is four-stage steam extraction, and the high-pressure steam source is mainly steam. Steam source rushing, high pressure steam source load. Due to design limitations, its low-pressure steam source does not have sufficient lifting force in the high-load section of the unit, resulting in its normal run-off procedure under high-load conditions cannot be put into operation. [0003] The existing small steam turbine adopts the equipment and original preparation system of WOODWARD Company. Since the original controller is a packaged encryption progra...

AI Technical Summary

Problems solved by technology

Due to design limitations, the low-pressure steam source does not have sufficient lifting force in the high-load section of the unit, resulting in the normal run-off procedure under high-load conditions cannot be put into operation

[0003] The existing small steam turbine adopts the equipment and original preparation system of WOODWARD Company. Since the original controller is a packaged encryption program (black box control), all its control logics are unique and determined after leaving the factory. Although this product can meet the adjustment requirements when the system is running smoothly Required, but not to flush small turbines at high loads

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