Power plant water supply system and its vertical long axis semi submersible turbine pump solution

The power plant water supply system is a key system that ensures the stable operation of core equipment such as boilers and turbines. It is mainly responsible for providing production water that meets water quality requirements for the power plant, including raw water intake, water treatment, and water supply transportation. Finally, the treated water is transported to water equipment such as boilers, providing water source support for processes such as steam circulation and cooling in the power plant.
Solution for Vertical Long Axis Semi submersible Turbine Pump in Power Plant Water Supply System
1. Equipment selection and adaptation
Conventional fresh water supply scenario: High efficiency and energy-saving vertical long shaft semi submersible turbine pump is selected, and the pump body is made of 304/316 stainless steel material, suitable for clean water transportation, to ensure the water quality of the power station's water supply; The head covers 20-150 meters and the flow rate can reach 100-3000m ³/h, meeting the water supply needs of power plants of different scales.
Special working condition scenario with high sediment/corrosive media: If the water source contains a small amount of sediment and impurities, a vertical long shaft semi submersible turbine pump with wear-resistant coating can be selected as the core component. A wear-resistant lining plate can be installed on the pump body, and a water-cooled bearing box or a dual phase steel pump body can be configured to enhance the equipment's resistance to abrasion and corrosion; For special environments such as high altitude and low temperature, a long shaft pump with heating device can be selected to avoid the impact of medium freezing on operation.
2. Stable operation guarantee
The rotor of the vertical long shaft semi submersible turbine pump adopts a withdrawable design, which can complete the maintenance of core components such as impellers and guide bearings without disassembling the pump body, greatly reducing downtime and ensuring the continuity of power plant feedwater.
The vertical long shaft semi submersible turbine pump is equipped with an external cooling and lubrication system to ensure the normal operation of the guide bearing under high temperature and high load conditions; The shaft seal adopts packing sealing, and replaceable shaft sleeves are installed at the shaft seal and guide bearing to reduce the risk of leakage and extend the service life of components. If a mechanical seal structure is used, rolling bearings should be installed at the sealing installation site to reduce pump shaft deflection and avoid leakage problems.
3. Energy saving optimization and upgrading
The vertical long shaft semi submersible turbine pump is equipped with an intelligent variable frequency control system, which automatically adjusts the water output according to the peak and valley of power station water consumption and equipment load, avoiding the ineffective energy consumption of high flow and low head, and achieving an energy-saving effect of 25% -30%.
For large power plants, a vertical long axis semi submersible turbine pump multi pump parallel operation scheme can be adopted to intelligently start and stop the water pumps according to actual water demand, further improving energy utilization efficiency.
4. Intelligent control and system optimization
Deploy flow, pressure, and water quality sensors, build an IoT monitoring network, collect real-time data and upload it to the cloud to achieve data-driven precision scheduling, and promptly warn of equipment failures and water quality abnormalities.
Optimize the overall layout of the water supply system, set up pump station positions and pipeline routes reasonably, and reduce pipeline resistance losses; Simultaneously upgrading the water source pretreatment process, controlling indicators such as turbidity and hardness of the feedwater, and reducing wear and corrosion on the vertical long shaft semi submersible turbine pump.
Equipped with an intelligent frequency conversion control system, the pump speed is automatically adjusted according to the water supply demand and flow fluctuations of the power station, avoiding ineffective energy consumption and achieving an energy-saving effect of over 20%.
Case study of vertical long shaft semi submersible turbine pump for power plant water supply system
1. Yellow River Water Extraction Project (Raw Water Extraction for Thermal Power/Nuclear Power Plants)
Scenario requirement: The Yellow River has high sediment content and requires long-term high flow pumping of raw water, with extremely high requirements for pump wear resistance.
Equipment selection: A vertical long shaft semi submersible turbine pump is selected, with ceramic particle wear-resistant coating on the core components and super duplex steel material to resist sediment wear. It is also suitable for high head and high flow raw water transportation needs, with a wide range of head coverage and flow rates up to thousands of cubic meters per hour.
Operational advantages: Ceramic coating has low surface roughness and high wear resistance, which can improve the efficiency of water pump operation and reduce maintenance costs; The rotor is designed to be withdrawable, allowing for core component maintenance without disassembling the pump body, ensuring the continuity of the power plant's raw water supply.
2. Water supply network project in Rongdong area of Xiong'an New Area (urban water supply+indirect water replenishment from power stations)
Scenario requirement: To supply tap water to the Rongdong area and also serve as an emergency or circulating water source for surrounding power stations, while balancing stability and efficiency.
Equipment selection: Three vertical long shaft semi submersible turbine pumps are selected as the main source of raw water transportation, combined with a medium opening double suction pump for relay transportation. The pump body adopts a multi-stage impeller combination, and the axial force is adjusted through the balance hole to meet the efficient transportation requirements of clean water medium.
Operational advantages: The water pump runs smoothly, efficiently and energy-saving, and can achieve functions such as automatic start stop and remote monitoring based on liquid level, ensuring the continuity and reliability of the water supply system and providing stable water replenishment support for the power station.
3. Power plant cooling water delivery system
Scenario requirement: To transport circulating cooling water to the power plant cooling tower, it is necessary to deal with the working conditions of long-term continuous operation and medium containing a small amount of impurities. At the same time, it is necessary to solve the resonance problem caused by long shaft system and low support stiffness.
Equipment selection: A vertical long shaft semi submersible turbine pump is selected, with core components equipped with wear-resistant coatings and super duplex steel materials. The rotor adopts a withdrawable design and is matched with an external cooling and lubrication system.
Optimization plan: if the vibration exceeds the standard, the reason for resonance can be determined through finite element analysis, and slant support can be installed on the foundation to increase the natural frequency of the pump set, avoid the resonance interval, solve the vibration problem, and ensure the stable operation of the circulating water system.