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Time：2025-09-17 14:46:34 Reading volume：
Fire-resistant oil—primarily phosphate ester fire-resistant oil, such as triaryl phosphate esters—is a high-performance fluid widely used in power plant turbine EH (electrohydraulic control) systems. Unlike mineral oil, it has unique chemical properties and is highly sensitive to moisture, solid particles, and impurities.
To maintain system reliability and safety, specialized fire-resistant oil purification equipment is required. These systems remove water, solid contaminants, acidity, chlorine, and degradation byproducts, restoring oil quality and extending service life.
Below is a detailed overview of the main purification units, equipment combinations, auxiliary devices, and application areas.
Function: The most critical step in phosphate ester purification. Uses vacuum technology to reduce water’s boiling point, vaporizing and removing dissolved or emulsified water.
Importance: Water contamination accelerates hydrolysis and increases acidity. Keeping water content below 1000 ppm (ideally <500 ppm) is essential for safe operation.
Function: Removes solid particulates to achieve high cleanliness levels (NAS 1638 Class 5 or better).
Types:
Pre-filter (10–20 microns): Protects fine filters and pumps.
Fine filter (1–3 microns): Ensures critical system cleanliness.
Materials: Filter elements must be phosphate ester–compatible, often made of glass fiber or stainless-steel mesh.
Function: Removes acidic substances, chloride ions, pigments, and colloids formed during oil aging, lowering acid value and restoring resistivity.
Adsorbent Types:
Diatomaceous earth: Traditional and effective, but requires careful dosing.
Activated alumina: Reduces acidity but may over-adsorb.
Ion exchange resin: Highly effective at removing ionic contaminants.
Composite adsorbents: Modern solutions that balance acid removal with property retention.
Note: Adsorbent media are consumables and must be replaced regularly.
Description: A compact cart system integrating vacuum dehydration, heaters, transfer pumps, precision filters, and optional adsorption units.
Operation: Works as a bypass purification system connected to the oil tank for online filtration.
Advantages: Flexible, portable, ideal for maintenance and moderate oil contamination.
Description: Permanently installed on EH system pipelines. Includes circulation pumps, fine filters (1 micron), and continuous adsorption filters.
Advantages: Operates 24/7, ensuring stable oil quality, proactive maintenance, and maximum reliability.
Heater: Preheats oil (<65°C) to boost dehydration efficiency without accelerating oil degradation.
Oil Transfer Pump: Typically gear or centrifugal, designed with phosphate ester–compatible materials.
Online Monitoring System: High-end units track moisture, particle contamination, temperature, flow, acid value, and resistivity in real time.
Fuel-fired power plants – EH turbine systems (largest application).
Nuclear power plants – Control and regulation systems.
Industrial gas turbines – Certain control circuits.
Naval vessels – Shipboard power and safety-critical control systems.
When choosing equipment, consider:
Oil condition – Acid value, moisture level, and particulate contamination.
System size – Tank capacity and flow rate requirements.
Automation level – Need for online monitoring, alarms, and automatic control.
Safety compliance – Material compatibility with phosphate esters and explosion-proof electrical design.
Conclusion
A complete fire-resistant oil purification solution is not just one device but an integrated process combining vacuum dehydration, precision filtration, and adsorption regeneration. By implementing the right purification strategy, power plants and industrial facilities can ensure long-term reliability, safety, and cost efficiency of their EH systems.
