Marine
Detailed Explanation of KDP Plate Heat Exchangers in Ships: Applications and Process Flow
1. Marine PHE Applications:
Primarily for cooling/heating (central cooling, fuel heating, oil cooling).
2. Process Flow:
Includes seawater-freshwater exchange, staged fuel heating, and high-viscosity oil cooling.
3. Material Selection:
Seawater/high-sulfur: Titanium Gr2 or 254SMO
Low-sulfur/freshwater: 316L
High-temp/pressure oil: 2205 Duplex
Key Applications in Marine Systems
Plate heat exchangers (PHEs) are widely used in ships for the following systems:
Typical Process Flow in Marine PHEs
Central Cooling System (Most Common)
A[Seawater Pump] --> B[Filter (100μm)] --> C[PHE (Primary Side)]
D[Low-Temp Freshwater] --> E[Control Valve (PID)] --> C[PHE (Secondary Side)]
C --> F[Engine Cooling System]
Key Parameters:
Seawater velocity: 1.0-1.5 m/s (prevents biofouling)
Freshwater velocity: 0.5-0.8 m/s (reduces pressure drop)
Fouling factor: ≤0.00005 m²·K/W (seawater side)
Fuel Oil Heating (High-Sulfur Environment)
A[HFO] --> B[PHE (Hot Side)]
C[Steam/Heat Medium] --> D[PHE (Cold Side)] --> E[Fuel Injection System]
Key Parameters:
Fuel velocity ≥1.2 m/s (prevents sulfur deposits)
Staged heating (40°C→80°C→120°C)
Lubricating Oil Cooling (High-Viscosity Fluid)
A[Hot Oil] --> B[PHE (Wide Gap Design)] --> C[Cooled Oil]
D[Seawater/Freshwater] --> E[PHE] --> F[Discharge/Circulation]
Key Parameters:
Oil velocity: 0.3-0.6 m/s (prevents coking)
Cooled oil temp.: 50-60°C
Material Selection for Marine KDP Plate Heat Exchangers (Detailed Examples)
(1) Material Selection Criteria
Marine PHE plates must meet:
Corrosion resistance (especially for seawater/HFO)
Mechanical strength (vibration/shock resistance)
Weldability (laser welding compatibility)
Cost-efficiency (titanium is expensive but long-lasting)
Comparison of Common Plate Materials
Application-Specific Examples
Central Cooling (Seawater-Freshwater)
254SMO (seawater side) + 316L (freshwater side)
254SMO withstands high chloride levels (50,000 ppm)
316L reduces cost on the freshwater side
Fuel Heating (High-Sulfur HFO)
Titanium Gr2
Titanium is virtually immune to sulfur corrosion (safe even at ≤3.5% sulfur)
Long service life reduces maintenance costs
Lubricating Oil Cooling (High Viscosity)
2205 Duplex Steel
Resists oil oxidation corrosion
High mechanical strength for high-pressure systems
Summary
Primarily for cooling/heating (central cooling, fuel heating, oil cooling).
Includes seawater-freshwater exchange, staged fuel heating, and high-viscosity oil cooling.
Seawater/high-sulfur: Titanium Gr2 or 254SMO
Low-sulfur/freshwater: 316L
High-temp/pressure oil: 2205 Duplex
Our Core Strengths
In the petrochemical industry, equipment needs to withstand high temperature, high pressure, corrosion, scaling and other multiple tests. We are the preferred supplier of heat exchanger solutions for harsh working conditions due to the following core advantages:
Optimized heat transfer solutions according to petroleum/chemical process requirements
Full range of plate heat exchangers, condensers, evaporators, etc.
Strict quality control, adapt to high temperature, high pressure and corrosive environment.
From selection to maintenance, to ensure long-term stable operation.
King DuPont, China famous brand of heat transfer and fluid handling supply platform.
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