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Sludge Heat Exchanger – Biogas / Methanisation / Sewage treatment

Sludge spiral heat exchangers are specially designed for digester sludge heating and heat recovery applications, such as digested sludge heating, raw sludge heating and heat recovery from effluents, pasteurisation, methanisation.


GreenSpiralTM for sludge treatments is made of two concentric channels, the spacings and width are controlled by special guideways and chosen in accordance with customer’s requirements and working conditions. This approach of the Spiral Plate Heat Exchanger allows to take into account such parameters as fluids flow rate, presence and concentration of mechanical impurities (solids, fibers, etc…), pressure drop values.


Spiral heat exchangers are the alternative to traditional tube in tube heat exchangers.

Energy saving

Spiral design and optimization of conditions in both channels of customized Spiral Plate Heat Exchangers provide high heat transfer performance compared to traditional tubes & tubes and reduce energy costs usually needed to heat sludge.

Self cleaning effect

Thanks to the single channel configuration, a turbulent flow is created to handle tough medias.

As it’s a single channel heat exchanger, if there is any cross section reduction inside the channel, flow velocity will increase flushing out the deposit

Standard or customized

Nexson spiral heat exchangers can be either customized or you can go for standard models. The standard range gives you the opportunity to discover the spiral heat exchanger technology at a very limited cost and with a short delivery time while offering similar quality and a made in France production.

Low installation cost (compactness)

Spiral Plate Heat Exchangers are designed to maximize the heat transfer surface in a very limited footprint. They are set up horizontally with no need for complex installation. The budget for installation is thus limited.

Low operating cost

By removing the covers handled with fixations, the access in case of inspection or eventual cleaning is made easier

Easy access for inspection and cleaning

Access and inspection of the whole heat transfer surface is facilitated thanks to openable end covers.

Heat transfer area surface

The heat transfer area available for a liquid to liquid exchanger fluctuates from 5 to 90m².

The Nexson sludge Spiral Plate Heat Exchanger can be manufactured in carbon steels or stainless steels) (SA 516 Gr60, SA 516 Gr70, 304 / 304L, 316 / 316L).

They are used for a design pressure from the 1 barg to 10 barg .

Traditionally used as

  • Digested sludge heater
  • Raw sludge / digested sludge economiser
  • Pasteurizer
  • Effluent energy recover

Associated products

Green Spiral – Type 1

Liquid to liquid duties

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