Spiral Heat Exchangers
Spiral Heat Exchangers - Liquid Applications
Spiral Plate Heat Exchangers are made of 2 concentric channels on which spacer pins are welded to form the channel’s gaps. Each channel gap and the width of the channels are selected to meet each Customer’s specific requirement and working conditions. Correct design takes into account the flow rates, viscosities, sizes and concentration of particles for fouling fluids and pressure drops etc.. These spacer pins facilitate turbulent flow in each channel.
Advantages:
- Single channel
The single channel flow makes gives Sprial Heat Exchangers a unique design feature for even heat transfer distribution and a high heat transfer value (K value). Compact Size and Robustness
In liquid-to-liquid duty, one Nexson spiral heat exchanger can replace 3 traditional Shell & tubes products, thus liberating footprint for other process equipment.
- Self-cleaning effect – No Dead Zones
Thanks to the single-channel configuration, a turbulent flow is created to handle tough and fouling media on one or even both sides.
As it is a single-channel design, if there is any cross-section reduction inside the channel, flow velocity will increase thus increasing turbulence flushing out the deposit. Low Maintenace Cost
The self-cleaning effect provides for less frequent stops for cleaning and maintenance, and necessary spare parts are a minimum due to the unique design, thus necessary operation and maintenance costs are exceptionally low.
Full access to the heattransfer area
Access and inspection of the whole heat transfer surface is possible thanks to openable end covers.
- Fouling duties
Originally these spiral plate heat exchangers were used in the pulp and paper industry where fouling problems are frequent when using classical shell and tube exchangers (or multi-channel heat exchangers) due to fibers or particles in the media. - Tough process conditions
Because of their robust construction Nexson spiral heat exchangers can handle high temperatures and/or pressure even in cycling duties. Nexson spiral heat exchangers can handle material extension without mechanical failure when pressurized or by changes in temperature. Small Temperature Approach Possible
Nexson spiral heat exchangers provide the possibility of media temperature approach around 3°C.
Alternative to conventional Shell and Tube heat exchangers
Thanks to its thermal efficiency, robustness and its versatile design, the Spiral Plate Heat Exchanger has proven, since the 1930ies, to be essential in fields and industries as various as Pulp and Paper, Refineries, Petrochemicals, Oil&Gas, Food Industries, Mining, Steel and Metal manufacturing as well as Environmental Applications as Biogas production and Waste Water Treatment, etc.
Nexson Group designs develops and manufactures your spiral heat exchanger in the formable and weldable materials of your choice (GreenSpiralTM). More compact and 3 times more thermally efficient than tubular heat exchangers, these Spiral heat exchangers provide substantial savings in installation footprint, as well as operation and maintenance costs.
Thanks to its specific design, the liquid-to-liquid heat exchanger can handle one or two fouling fluids. Both channels are easy to access for inspection and cleaning.
Able to work in extreme conditions (of pressure and temperature), this single-channel heat exchanger, with a self-cleaning effect, has become the alternative to the shell & tube exchangers.
Traditionally uses for
Spiral heat exchangers for liquid-to-liquid applications are used in most industries: – Pulp and Paper, Refineries; – Petrochemicals; – Oil&Gas; – Food Industries; – Mining; – Steel and Metal manufacturing, as well as,
Environmental Applications as: – Biogas production; and Waste Water Treatment; etc. in applications for:
- Heat Recovery
- Heating
- Cooling
Material Selection and Design Limits
Spiral plate heat exchangers can be manufactured in any material that can be formed and welded (carbon steels, stainless steels, duplex, super-duplex, titanium, nickel alloys, etc…) – SA 516 Gr60, SA 516 Gr70, 304 / 304L, 316 / 316L, UNS S310803, UNS S32205, UNS S32750, 904L, 254 SMO, C276, C22, C2000, Titanium…
Nexson spiral heat exchangers are used for a design pressure from full vacuum to 80 barg and at -200°C design temperature to 450°C.
Nexson can provide the biggest Spiral Heat Exchangers in the world, with up to 500 m2 surface area or up to 4 m in diameter.
Nexson Group supplies a wide range of spiral heat exchangers from customized design to standard units.
Spiral Heat Exchanger - Sludge Heat Exchanger - Biogas Digestion - Energy Recovery
- Normally used as Anaerobic Sludge Heater – Raw Sludge / Digested Sludge Economizer – Pasteurizer – Effluent Energy Recovery
- High heat transfer value (K value) which leads to big savings in energy costs
- Self-cleaning effect due to turbulence
- For fouling duties – Can handle fouling liquids on both warm and cold sides at the same time
- Low maintenance cost
- Low pressure drop
- Easy access for cleaning
Spiral Heat Exchangers - Bi-Phasic Applications
Spiral Plate Heat Exchangers are made of 2 concentric channels on which spacer pins are welded to form the channel’s gaps. Each channel gap and the width of the channels are selected to meet each Customer’s specific requirement and working conditions. Correct design takes into account the flow rates, viscosities, sizes and concentration of particles for fouling fluids and pressure drops etc.. These spacer pins facilitate turbulent flow in each channel.
CONDENSATION
The vapor circulates, cross flow, in a fully opened channel, with negligible pressure drop and the coolant circulates in a closed spiral channel.
Thanks to its versatile design, it can be directly installed on the top of acolumn/rector without any supporting system, reducing quite much installation costs.
It is perfectly suitable for vacuum condensation with negligible pressure drop. It can be used as vent condenser.
EVAPORATION
The fluid to evaporate circulates in an adjusted channel gap, fully opened, that allows working with fouling fluids. It also allows easy access for an inspection or an eventual mechanical cleaning.
NEGLIGIBLE PRESSURE DROP
Thanks to the cross flow on the steam / vapour side there is nearly no pressure drop (we are in a range of 0.1 kpa)
CONDENSATION UNDER VACUUM
With a very low pressure drop, this allows spiral heat exchangers to process under complete vacuum conditions.
SUB-COOLING OF INERTS AND/OR CONDENSATES
We can set up different mechanical constructions to subcool (or not) inerts and condensates
COLUMN MOUNTED
Spiral heat exchangers can be directly mounted at the top of the distillation column / reactor without any supporting system
STEAM HEATER
Spiral heat exchanger is made to handle cycling duties, thanks to its robust construction. Nexson spiral heat exchanger can expand without mechanical failure during the pressure and/or temperature increase.
LOW MAINTENANCE COST
Nexson spiral heat exchangers are designed to maximize heat transfer surface. They can be set up vertically or horizontally with no need for complex installation. In addition maintenance costs are very low.
HEAT TRANSFER AREA SURFACE
Heat transfer area available from 2 to 3000m².
Traditionally uses for
Spiral heat exchangers for Bi-Phasic applications are used in most industries: – Pulp and Paper, Refineries; – Petrochemicals; – Oil&Gas; – Food Industries; – Mining; – Steel and Metal manufacturing, in applications as:
- Vacuum Condenser
- Overhead Condenser
- Reflux Condenser
- Vent Condenser
- Gas Cooler
- Steam Heater
Material Selection and Design Limits
Spiral plate heat exchangers can be manufactured in any material that can be formed and welded (carbon steels, stainless steels, duplex, super-duplex, titanium, nickel alloys, etc…) – SA 516 Gr60, SA 516 Gr70, 304 / 304L, 316 / 316L, UNS S310803, UNS S32205, UNS S32750, 904L, 254 SMO, C276, C22, C2000, Titanium…
Nexson spiral heat exchangers are used for a design pressure from full vacuum to 80 barg and at -200°C design temperature to 450°C.
Nexson can provide the biggest Spiral Heat Exchangers in the world, with Heat transfer area available from 2 to 3000m². and up to 4 m in diameter.
Steam Heaters - Bi-Phasic Applications
STEAM HEATER
The Spiral Heat Exchanger model 3 can be used as steam heater for tough duties. Fouling duty channel with opeanable cover enables easy access for inspection or for an eventual mechanical cleaning
Spiral heat exchanger are made to handle cycling duties, thanks to its robust construction. Nexson spiral heat exchanger allows material expansion without mechanical failure during pressure and/or temperature increase. This why spiral heat exchanger are used as steam heaters.
CONDENSATION
The vapor circulates, cross flow, in an alternated channel, with negligible pressure drop and the coolant circulates in an accessible spiral channel.
NEGLIGIBLE PRESSURE DROP
Thanks to the cross flow feature for the steam/vapour side there is nearly no pressure drop.
LOW MAINTENANCE COST
Nexson spiral heat exchangers are designed to maximize heat transfer surface. They can be set up vertically or horizontally with no need for complex installation. In addition, maintenance costs are limited.
HEAT TRANSFER AREA SURFACE
Heat transfer area available from 2 to 500m².
