High-Pressure Boiler Feed Pump & Auxiliary Equipment | For Power Plant & Industrial Boiler Systems

Working Principle This pump is a single-suction, multi-stage, segmental centrifugal pump, utilizing a balance disc/balance drum structure to counteract axial thrust. The medium is drawn in axially, gains kinetic energy through high-speed rotating impellers, is pressurized progressively stage by stage, and finally discharged radially. Key components (such as shafts, impellers, and guide vanes) are made of high-temperature alloy steel or stainless steel. The mechanical seal can be configured as cartridge-type or metal bellows-type, ensuring sealing reliability under high-temperature and high-pressure conditions. The back-pull-out design allows for the inspection and replacement of the impeller, mechanical seal, and shaft assembly without disconnecting the suction and discharge piping, significantly reducing downtime and maintenance costs. Application Fields 1. Thermal Power Generation: Power plant boiler feedwater, steam turbine circulating watermakeup, and condensate recovery systems. 2. Chemical & Petrochemical Industries: Process boiler feedwater, high-temperature heat carrier circulation, and transportation of corrosive chemical media. 3. Metallurgy & Papermaking: Waste heat boiler feedwater, high-pressure descaling systems, and papermaking black liquor concentration transportation. 4. General Industrial Applications: District central heating, mine drainage, factory high-pressure cleaning, and high-lift fluid transportation. FAQ Q1: The DG boiler feed pump is prone to "cavitation" during operation. How can it be effectively prevented? A: Cavitation is typically caused by insufficient inlet pressure or excessively high medium temperature. Preventive measures include: ensuring the Net Positive Suction Head Required (NPSHr) meets operating conditions, rationally designing the inlet piping (reducing elbows and resistance), and installing a booster pump upstream or increasing the deaerator installation height. Additionally, using anti-cavitation material impellers is an effective solution. Q2: How does this boiler auxiliary equipment ensure long-term sealing reliability under high temperature and high pressure? A: We utilize cartridge mechanical seals combined with a cooling water flushing plan (e.g., API Plan 21/23) to effectively reduce seal chamber temperature. For high-pressure conditions, balanced mechanical seals or bellows seals are recommended. The shaft seal is also equipped with a cooling water jacket, ensuring the sealing surface maintains low leakage and long service life even at 180°C. Q3: What is the daily maintenance cycle for boiler auxiliary equipment, and which components require the most attention? A: We recommend conducting vibration and temperature inspections every 2,000 operating hours and performing overhaul inspections every 8,000 hours. Focus on checking the wear of the balance disc/drum, mechanical seal leakage, bearing grease condition, and impeller wear ring clearance. Thanks to the back-pull-out design, replacement of wearing parts can be completed within 2-4 hours, significantly improving equipment availability.