Cast Steel Ejector Cooling Pump

I. Product Overview

Marine cast steel ejector cooling pumps are high-efficiency heat exchange devices designed for ship thermal systems, using ZG270-500 cast steel or ZG310-570 high-strength cast steel as the main material. Based on the ejector pump principle (Venturi effect), they enable forced circulation of seawater, fresh water, or cooling liquids. The core principle is that high-pressure working water forms a high-speed jet through a cast steel nozzle, creating vacuum negative pressure in the suction chamber to draw in cooling media, which are then pressurized by a diffuser and delivered to the heat exchange systems of main engines, generators, and other equipment. After quenching-tempering treatment and nano-silicon coating reinforcement, the cast steel material can operate stably in seawater with Cl⁻≤25,000ppm, suitable for marine main engine cooling, LNG pump cabin temperature control, and air conditioning systems, meeting IMO maritime regulations and international classification society certifications (LR, ABS, DNV, etc.).

II. Core Technologies and Material Characteristics

1.Cast Steel Material Selection and Performance

2.Key Technical Parameters

Flow range: 50-500m³/h, suitable for ships of 2,000-30,000 tons

Head: 12-35m, self-priming height ≥7m, start-up response time ≤20s

Heat exchange efficiency: Ejector cooling efficiency ≥72%, 15%-20% higher than traditional centrifugal pumps

Corrosion resistance design: Cast steel surface with nano-silicon coating (thickness ≥280μm), passing 4,000-hour salt spray test without rust, seawater erosion resistance increased by 70%

III. Technical Advantages and Innovative Design

1. High-Efficiency Heat Exchange and Anti-Clogging Capability

Non-rotating component design: Ejector pumps have no vulnerable parts such as impellers or shafts, capable of passing ≤5mm solid particles (such as marine organisms, rust), reducing clogging risk by 85%, suitable for cooling media with impurities.

Enhanced heat exchange structure: The diffuser adopts a gradually expanding spiral guide design (cone angle 10°-15°), increasing the heat transfer coefficient by 25%, with equipment temperature rise ≤30℃.

2. Extreme Condition Adaptability

Anti-tilt performance: Stable water supply under ship trim 22.5° and list 12°, adapting to ship swaying environments and ensuring continuous operation of the cooling system.

Low-temperature corrosion resistance design: ZG310-570 cast steel with thermal insulation coating can transport -30℃ low-temperature ethylene glycol solution, adapted to LNG ship pump cabin cooling.

3. Long Life and Convenient Maintenance

Wear-resistant reinforcement: Cast steel impeller surface treated by supersonic flame spraying tungsten carbide (thickness 150μm), 5x improved wear resistance, service life exceeding 30,000 hours.

Quick-release modular structure: Pump body and pipelines use flange quick-connect design, reducing single-component replacement time by 75% and maintenance costs by 45%.

IV. Typical Application Scenarios

1. Marine Power System Cooling

Diesel engine cooling: ZG310-570 cast steel ejector pumps provide seawater cooling for ocean-going cargo ship main engines, flow 200-300m³/h, combined with plate heat exchangers to control cylinder liner temperature at 85-95℃.

Gas turbine cooling: ZG270-500 cast steel pumps transport fresh water to the gas turbine lubrication system, self-priming height 8m, adapting to multi-deck engine room layouts.

2. Special Vessel Cooling

LNG ship pump cabin cooling: Low-temperature ejector pumps transport -162℃ liquid nitrogen coolant, combined with vacuum insulated pipelines, to provide constant temperature cooling for LNG pump units.

Nuclear submarine reactor cooling: Radiation-resistant cast steel ejector pumps (shielding layer thickness ≥50mm) ensure reactor loop cooling, meeting military-grade safety requirements.

3. Auxiliary Equipment Heat Dissipation

Generator cooling: Provide fresh water cooling for marine auxiliary generators, flow 80-120m³/h, control winding temperature ≤110℃.

Hydraulic system heat dissipation: with oil coolers to dissipate heat for deck machinery hydraulic systems, controlling oil temperature at 40-60℃.

V. Selection and Maintenance Specifications

1. Key Selection Parameters

Cooling medium: Choose ZG270-500 for fresh water, ZG310-570 for seawater/low-temperature liquids

Ship tonnage: Select ZG270-500 for <10,000 tons, ZG310-570 for ≥10,000 tons

Temperature requirement: Electric tracing + thermal insulation layer (thickness ≥100mm) required for < -30℃

2. Maintenance Key Points

Daily monitoring: Real-time monitoring of inlet/outlet pressure and bearing temperature (temperature rise ≤35℃), ensuring pressure fluctuation ≤±8%

Regular maintenance: Clean suction filters (filtration accuracy ≤8mm) quarterly, remove heat exchange tube scale with 3% citric acid solution annually

In-depth maintenance: Ultrasonic testing every 2 years, reapply nano-silicon coating, and inspect seal aging

VI. Compliance and Certification

International standards: Complies with IMO MSC.302(87) Code for Ventilation and Air Conditioning of Machinery Spaces on Ships

Classification society certifications: Passed LR Rules for the Classification of Ships and ABS Rules for Building and Classing Ships

Safety specifications: Low-temperature products certified by ATEX for low-temperature environments (-196℃ applicable)