EH oil pump HQ37.11Z is the core power equipment of the steam turbine speed control oil system. It is specially designed for the high-pressure fire-resistant oil (EH oil) system and is mainly responsible for supplying high-pressure power oil to the main steam valve and speed control valve of the steam turbine. Its outlet pressure is usually set to 14.5±0.5MPa, and the full flow output can reach 85L/min, ensuring the rapid response of key valves to achieve load regulation and safety protection of the steam turbine.

Key parameters and performance advantages

1. High-pressure oil supply capacity: through the high-precision rotor and pump body structure design, it meets the system’s stringent requirements for pressure stability and flow continuity, and is compatible with high-pressure accumulators to cope with instantaneous large flow requirements.

2. Fire-resistant oil compatibility: It is compatible with phosphate-type fire-resistant oil (EH oil) with an auto-ignition point higher than 566℃, effectively reducing the risk of combustion and explosion caused by high-temperature leakage and ensuring the safe operation of power plants.

3. System integration adaptability: EH oil pump HQ37.11Z work with magnetic oil filter, oil cooler, overflow valve and other components to ensure oil cleanliness (within NAS level 6) and temperature control (operating temperature is usually ≤60℃).

Maintenance strategy and operating specifications

1. Periodic maintenance:

- Routine inspection (3-6 months): monitor vibration, noise, inlet and outlet pressure fluctuations, detect oil particle size and acid value, clean or replace the pre-pump filter (recommended accuracy 10μm).

- Overhaul cycle (12-24 months): disassemble and check rotor wear, seal aging (such as O-rings, mechanical seals), check coupling alignment deviation (≤0.05mm), and replace wearing parts when necessary.

2. Key points of operation monitoring:

- Real-time monitoring of bearing temperature (alarm threshold ≤85℃) to avoid material fatigue or lubrication failure due to overheating.

- Track the resistivity (≥5×10^9Ω·cm) and moisture content (≤0.1%) of fire-resistant oil through the online oil analysis system to prevent electrochemical corrosion.

Fault prevention and system optimization

- Shutdown operation specifications: Double isolation (power off, close inlet and outlet valves) must be performed before maintenance, and the pressure must be released to below 0.5MPa to avoid accidents caused by residual oil pressure.

- Redundant configuration recommendations: Use the automatic switching logic of the main and standby pumps, cooperate with the pressure sensor and PLC control module, and realize seamless switching in the event of a fault (response time ≤2 seconds) to improve system reliability.

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