Control method and control system for water feed pump turbine

Abstract

The invention discloses a control method and a control system for a water feed pump turbine. An independent manual operating device is added to a pipeline valve again under a high back pressure working condition, the logic that the pipeline valve cannot be opened until the fully open state of a low pressure valve is removed, an auxiliary steam source is used when impulse starting is carried out on a small turbine, after the cold-recycling pressure of a generator unit load belt meets requirements, an operator manually switches the steam source of the small turbine, the small turbine merely uses a cold-recycling steam source under a high back pressure operation working station, a four-section steam pumping system is separated from the auxiliary steam source, and after the pipeline valve is fully opened or opened to a certain opening degree, the rotating speed of the small turbine is still controlled through the valve of a small turbine unit. The control method and control system for the water feed pump turbine can be applied to a heat supply mode and a pure condensation mode, the safety and economy requirements for operation of the water feed pump turbine on the premise of the thermal process of a heat supply period and a non-heat-supply period can be met.

Description

technical field [0001] The invention relates to the technical field of feedwater pump turbines, in particular to a control method and control system for feedwater pump steam turbines in dual modes of heat supply and pure condensation for power plant equipment. Background technique [0002] The feedwater pump turbine is one of the main components of the thermal cycle system of the power station, especially in the ultra-supercritical unit with high parameters and large capacity. Its safe and reliable operation directly affects the operation of the entire power station equipment. The working task of the feedwater pump steam turbine is to drive the feedwater pump, which must meet the water supply requirements required by the boiler. The steam for the feedwater pump steam turbine is supplied by high-pressure steam source or low-pressure steam source. The steam in the cold section), the low-pressure steam source comes from the fourth section of the main engine, and the steam is di...

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Problems solved by technology

Huadian Shandong Qingdao Co., Ltd. #2 power unit after the high back pressure heating transformation, the back pressure of the condenser of the unit increased, and the exhaust pressure of the small steam turbine increased during high back pressure operation, so the output of the small steam turbine could not meet the requirements

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