GAB-Neumann - Annular Groove Graphite Heat Exchangers
Annular groove graphite heat exchangers (interchangers) are especially adapted to the heating or cooling of ultra-corrosive liquid chemicals. This specific design allows for heat recovery between two ultra-corrosive fluids. Annular grooves are machined into impervious graphite discs to form the process and service channels. Heat is transferred by conduction through the graphite left between the process and the service channels. Annular groove graphite heat exchangers consist of a stack of graphite discs that are fused together.
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Product Details
Detail of a large annular groove graphite disc
GAB Neumann’s graphite heat exchangers consist of series of annular grooves that are machined onto each side of impervious graphite discs.
Assembly of an annular groove graphite heat exchanger
A GAB Neumann fitter prepares a steel pressure plate before assembling an annular groove heat exchanger.
Small impervious graphite heat exchanger
A small annular groove heat exchanger with corrosive fluids on both sides.
Large graphite heat exchanger
A large heat exchanger with a corrosive fluid on process side only with carbon fiber reinforcement.
Cross section of an annular groove heat exchanger
GAB Neumann’s graphite heat exchangers consist of series of annular grooves that are machined on each side of impervious graphite discs.
Vertical annular groove graphite heater
GAB Neumann offers different types and sizes of annular groove graphite heat exchangers. Graphite heaters or graphite coolers can be installed vertically or horizontally.
Cross section of an annular groove graphite heat exchanger
GAB Neumann’s heat exchangers consist of series of annular grooves that are machined on each side of graphite discs.
Small vertical annular groove graphite cooler
GAB Neumann offers different types and sizes of annular groove heat exchangers. Graphite heaters or graphite coolers can be installed vertically or horizontally.
Annular groove graphite disc
Annular grooves are machined in impervious graphite discs.
Annular groove graphite disc with wavy groove design
GAB Neumann’s unique wavy groove design provides increased turbulence even at very low velocity thereby improving the heat transfer coefficient and reducing the required heat transfer surface area.
- Impervious graphite: GAB GPX1, GPX1T or GPX2
- Shell, pressure plates and flanges: carbon steel or stainless steel
- Tie rods, nuts, bolts, washers, springs: stainless steel
- Totally modular design: number of discs, size of discs and number of passes can be adjusted
- Impervious graphite discs with annular groove (spiral)
- Maximum disc diameter: 900 mm
- Three different groove widths possible
- Parallel groove arrangement from 1 to 21 grooves
- Wavy groove design for increased turbulence (optional)
- Graphite nozzles on product and utility sides
- Thermal expansion compensation ensured by tie rods and helical springs
- Carbon-fiber reinforcement (optional)
Features
Key Features:
- Design pressure: -1 barg (full vacuum) to +10 barg (145 psig)
- Design temperature: -60 to +200°C (-76 to 392°F)
- Heat transfer area: 0.3 to 55 m2 (3 ft2 to 592 ft2)
- Design: according to European PED, ASME code, Chinese Pressure Vessel code and other national pressure vessel codes on request
Optional features:
- Sight glass
Key Benefits
- Outstanding corrosion resistance on one side (RA series) or on both sides (WA series)
- Superior heat transfer performance thanks to adjustable cross sections on both sides that guaranty a high level of turbulence
- Gasket-free design (fused discs)
- Resin-free surfaces (impregnation before machining) prevents release of black particles
- Self-cleaning design prevents fouling and clogging
- High operational safety
- Highly reliable equipment therefore low cost of ownership and low maintenance cost
- Compact and robust design
- Short lead time
- Long lifetime
Main Applications
- Heat recovery
- Heating or cooling of ultra-corrosive chemicals
- Heat transfer between two ultra-corrosive chemicals
- Best suited for single purpose units
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