The turbine control, monitoring, and protection system for power plants is the system that governs the operation of steam turbine units. Its structure is divided into two main parts: an electrically controlled servo system and a hydraulic system. The hydraulic system itself consists of an oil supply unit and hydraulic actuators. The DEH system controls the turbine by adjusting the hydraulic actuators. Steam turbine generator set The steam supply and adjustment process are highly precise. Most of the shortcomings and accidents in the industry stem from substandard oil quality, which can lead to internal leaks in electro-hydraulic converters and jamming of hydraulic actuators. These issues cause instability in the adjustment of power turbine units, fluctuations in load, sluggish response, overshoot, and other malfunctions. In extreme cases, substandard oil quality may even result in the electro-hydraulic converter or hydraulic actuator becoming completely stuck, preventing the turbine-generator unit from shutting down normally and potentially causing a severe accident in which the overspeed governor is damaged and fails, leading to catastrophic consequences. Therefore, oil quality is of paramount importance to this system. Currently on the market, the cooling and filtration of oil supply systems largely rely on relief valves. Given that oil quality frequently fails to meet standards, problems such as difficulty in establishing oil pressure—caused by stuck or seized relief valves and the aforementioned hydraulic actuator failures—are common occurrences.

　　To this end, the technicians have developed an oil supply system for power plants and... Power generation steam turbine unit This is designed to address the issues of substandard oil quality in existing fuel supply systems, as well as stuck relief valves that prevent oil pressure from building up and cause hydraulic motors to fail. To achieve the above objectives, the power-generation steam turbine unit adopts the following technical solution: On one hand, the fuel supply system includes an oil tank, a fuel supply pipeline, an oil return pipeline, and an independent circulating filtration and cooling pipeline. Inside the oil tank, there are an oil suction zone and an oil return zone. The suction end of the fuel supply pipeline is connected to the bottom of the oil suction zone and supplies oil to the hydraulic actuator. The suction end of the independent circulating filtration and cooling pipeline is also connected to the bottom of the oil suction zone, while its discharge end is connected to the top of the oil return zone. The independent circulating filtration and cooling pipeline can independently cool and filter the oil within the oil tank. From the suction end to the discharge end, the circulating filtration and cooling pipeline is sequentially equipped with a circulation pump, a cooler, and a filter. The filter features a detachable filtering element. The filter is a Y-type filter. The system also includes a first relief valve, whose two ends are connected to the pipelines at both ends of the circulation pump. The circulation pump is equipped with a first control component for managing its start-up and stop. Between the fuel supply pipeline and the oil return pipeline, there are a first connecting pipeline and a second connecting pipeline. The first connecting pipeline is fitted with a second relief valve, while the second connecting pipeline is equipped with a relief valve. There are two fuel supply pipelines—the main fuel supply pipeline and the backup fuel supply pipeline—each of which is fitted with a check valve. Both the suction ends of the fuel supply pipeline and the independent circulating filtration and cooling pipeline are equipped with filtering devices. On the other hand, a power-generation steam turbine unit for power plants is provided, comprising the fuel supply system described in any of the above aspects.

　　The aforementioned fuel supply system and power-generation steam turbine unit have the following significant advantages: This fuel supply system and... Power generation steam turbine unit The system includes a fuel tank, an oil supply line, an oil return line, and a separate circulating filtration and cooling line. Inside the fuel tank, the space is divided into an oil-suction zone and an oil-return zone. One end of the oil supply line is connected to the bottom of the oil-suction zone in the fuel tank, while the other end serves as the oil outlet that supplies oil to the hydraulic actuator. The suction end of the independent circulating filtration and cooling system is connected to the bottom of the oil-suction zone, and its discharge end is connected to the oil-return zone in the fuel tank. The oil inside the fuel tank is filtered and cooled through the independent circulating filtration and cooling pipeline, which operates independently without being restricted by the unloading valve. This enhances the autonomy of oil filtration, significantly improves oil quality, and greatly increases the operational safety of the hydraulic system.