In the steam turbine operation system of power plants, the fire-resistant oil system plays a vital role, and the EH Oil Circulation Pump F3V101P13P is one of the core equipment of the system. The EH Oil Circulation Pump F3V101P13P usually adopts the advanced working principle of a positive displacement pump. Taking the common vane pump as an example, there are several slidable vanes inside the pump body. When the motor drives the pump shaft to rotate, the vanes slide close to the inner wall of the pump body under the action of centrifugal force and specific pressure. On the inlet side of the pump, a low-pressure area is formed due to the movement of the vanes, which allows the fire-resistant oil (EH oil) to be smoothly sucked into the pump cavity. As the pump shaft continues to rotate, the EH oil sucked into the pump cavity is pushed by the vanes and moves toward the outlet side of the pump. On the outlet side, as the space gradually becomes smaller, the oil is squeezed and the pressure increases, so it is output at a higher pressure, continuously providing the turbine fire-resistant oil system with a working medium with appropriate pressure and flow to meet the action requirements of each actuator in the system.

Performance parameter interpretation

1. Flow parameters: The flow parameters of the EH Oil Circulation Pump F3V101P13P are one of the important indicators to measure its working capacity. Generally speaking, its design flow rate will be customized according to the scale and actual operation requirements of the turbine fire-resistant oil system of different power plants. The common flow rate ranges from tens of liters to hundreds of liters per minute. A stable and appropriate flow rate can ensure that the fire-resistant oil circulates quickly in the system, so that each control element responds in time, and ensures the sensitivity and accuracy of the turbine regulation system. For example, for a large 300MW turbine, the EH oil circulation pump F3V101P13P of its fire-resistant oil system may need to have a flow rate of about 200-300 liters per minute to meet the system’s demand for oil under different working conditions.

2. Pressure parameters: Pressure parameters are also critical. In the steam turbine fire-resistant oil system, the actuator needs high-pressure fire-resistant oil to achieve fast and precise actions, such as controlling the opening of the steam inlet valve of the steam turbine. The output pressure of the EH oil circulation pump F3V101P13P can usually reach 10-20MPa or even higher, and the specific value depends on the design requirements of the system. Such a high pressure can overcome the system pipeline resistance and the load of the actuator, ensuring that the fire-resistant oil can smoothly drive the actuator to move, and when the system pressure fluctuates, the pump can adjust the output pressure in time to maintain the system pressure stable within the specified working range.

3. Speed ​​parameters: There is a close relationship between the speed of the pump and the flow rate and pressure. In general, the EH oil circulation pump F3V101P13P is driven by a motor, and the speed of the motor is converted into the speed of the pump through a certain transmission mechanism. Usually its rated speed is between 1000-3000 rpm. The stability of the speed is crucial to ensure the stability of the flow and pressure output of the pump. If the speed fluctuates too much, it will cause instability in the flow and pressure, which will affect the normal operation of the steam turbine fire-resistant oil system. For example, when the turbine load changes suddenly, the fire-resistant oil system requires the pump to be able to quickly adjust the output. At this time, the rapid response capability of the pump speed is particularly important.

Role in the fire-resistant oil system

1. Maintaining stable system pressure: The fire-resistant oil system requires stable pressure to ensure that each actuator can work accurately and correctly. The EH oil circulation pump F3V101P13P continuously extracts fire-resistant oil from the oil tank and outputs it to the system at a set pressure. When the pressure in the system drops due to the action of the actuator and other reasons, the pump will automatically increase the output flow rate, replenish the oil in the system, and bring the pressure back to the set value; conversely, when the system pressure is too high, the pump will appropriately reduce the output flow rate through its own regulating mechanism to maintain the system pressure within the normal range. For example, during the start-up of the turbine, the steam inlet valve needs to be gradually opened, and the fire-resistant oil system needs to provide stable pressure to drive the valve actuator to operate. At this time, the EH oil circulation pump F3V101P13P needs to output pressure stably to ensure the smooth opening process of the valve.

2. Promote the circulation and heat dissipation of fire-resistant oil: The circulation of fire-resistant oil in the system is not only to transmit power, but also to dissipate heat. During the operation of the turbine, the fire-resistant oil will generate heat due to the friction of the actuator and other reasons. If the heat is not dissipated in time, the oil temperature will continue to rise, affecting the performance of the oil and the normal operation of the system. The EH oil circulation pump F3V101P13P promotes the continuous circulation of fire-resistant oil in the system, so that the oil can flow through the cooler and other heat dissipation equipment to dissipate the heat and maintain the oil temperature in a suitable working range, generally 35-55℃. For example, in the high temperature environment in summer, the load of the power plant is usually high, and the heat generated by the fire-resistant oil system of the steam turbine is more. At this time, the EH oil circulation pump F3V101P13P needs to maintain efficient operation to ensure that the fire-resistant oil can be fully circulated and dissipated to prevent the oil temperature from being too high and causing system failure.

3. Ensure the cleanliness of the oil: The fire-resistant oil system has extremely high requirements for the cleanliness of the oil. Tiny impurity particles may cause the precise control components in the system to wear or even get stuck, affecting the safe operation of the steam turbine. During operation, the EH oil circulation pump F3V101P13P will transport the fire-resistant oil through purification equipment such as filters. During the circulation process, the filter can continuously filter out impurity particles in the oil, such as metal chips and dust, to ensure that the cleanliness of the oil always meets the system’s operating requirements. At the same time, the continuous operation of the pump also helps to fully bring the contaminants that may exist in the system into the filter, thereby improving the efficiency of oil purification. For example, in the early stage of the operation of a newly installed fire-resistant oil system, there may be some impurities left over from construction in the system. At this time, the EH oil circulation pump F3V101P13P needs to run continuously for a period of time to cooperate with the work of the filter to fully remove the impurities in the oil so that the oil cleanliness reaches the qualified standard.

Common faults and treatment methods

1. Insufficient flow: Possible reasons include the blockage of the pump’s inlet filter, resulting in poor oil suction; severe wear of the blades, affecting the pump’s volumetric efficiency; the pump’s speed is too low, which may be a motor failure or a problem with the transmission mechanism. The treatment method is to clean the inlet filter regularly, check the blade wear, and replace the severely worn blades in time; check the motor and transmission mechanism, repair or replace the faulty parts, and ensure the normal speed of the pump.

2. Abnormal pressure: Too high pressure may be caused by blockage in the system, such as blockage of the outlet pipe, safety valve failure, etc.; too low pressure may be caused by serious leakage in the pump, such as damaged seals, excessive gap between the pump body and the side plate, etc. For the case of excessive pressure, it is necessary to check and dredge the outlet pipe, repair or replace the safety valve; for the case of too low pressure, it is necessary to check the seals, replace damaged seals, and adjust the gap between the pump body and the side plate.

3. Excessive vibration and noise: It may be caused by the pump being installed loosely, the anchor bolts being loose; air entering the pump, causing cavitation; and serious bearing wear. The treatment measures include re-tightening the anchor bolts to ensure that the pump is installed firmly; checking the inlet pipe of the pump to eliminate the possibility of air entering to avoid cavitation; and replacing worn bearings in time.

EH oil circulation pump F3V101P13P plays an irreplaceable role in the fire-resistant oil system of steam turbines in power plants. By deeply understanding its working principle, performance parameters, role in the system and common fault handling methods, the operation and maintenance personnel of power plants can better ensure the stable operation of the equipment, thereby ensuring the reliable operation of the fire-resistant oil system of steam turbines, and providing strong support for the safe and efficient power generation of power plants.

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