GAB Neumann

     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.

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.

      With their specific design our annular groove heavy-duty graphite condensers are especially adapted to the condensation of highly corrosive vapors. Annular groove heavy-duty graphite condensers transfer heat from a condensing vapor to a cooling medium. Graphite discs are machined to create annular grooves on the service side and large, banana-shaped channels on the process side. Heat is transferred by conduction through the impervious graphite left between the process and the service channels. Annular groove heavy-duty graphite condensers consist of a stack of discs that are fused together.

Details of an annular groove heavy-duty graphite condenser

    GAB Neumann’s heavy-duty graphite condensers consist of series of concentric annular grooves and channels that are machined into impervious graphite discs.

A Expansion system of an annular groove heavy-duty graphite condenser
GAB Neumann’s expansion system allows for differential elongation between impervious graphite and steel parts.

Vapor inlet of an annular groove heavy-duty graphite condenser
The size of the vapor inlet is adapted to the flow rate.

    Annular groove graphite partial condensers are especially adapted to the condensation of highly corrosive vapors. Their specific design allows the efficient condensation of vapors containing proportionally large amounts of non-condensable. They can also be efficient gas coolers. Annular groove graphite partial condensers transfer heat from a condensing vapor to a cooling medium. Graphite discs are machined to create annular grooves on service side and series of holes on the process side. Heat is transferred by conduction through the impervious graphite left between the process and the service channels. Annular groove graphite partial condensers consist in a stack of discs that are fused together.

     Graphite block heat exchangers are adapted to the heating, cooling, evaporation, condensation and absorption of highly corrosive liquid chemicals. This design is one of the most versatile type of impervious graphite heat exchangers. Rows of holes are drilled through graphite blocks both horizontally and vertically to form the process and service channels. Heat is transferred by conduction through the impervious graphite left between the rows of holes which separate the mediums being used. Graphite block heat exchangers consist in a stack of blocks encapsulated in  a steel shell.

Details of a graphite block
Heat exchange blocks consist in solid graphite blocks that are drilled with rows of holes in horizontal and vertical directions

Different sizes of graphite blocks
In order to best fit with customers’ process requirements GAB Neumann has developed different types and sizes of graphite block heat exchangers

Assembly of a graphite block heat exchanger
A GAB Neumann fitter puts the shell around a stack of graphite blocks.

      Graphite shell and tube heat exchangers are suitable for heating, cooling, condensing, evaporating or absorbing large flow rates of ultra-corrosive chemicals. This type of graphite heat exchanger is particularly versatile and all conceivable applications are possible.                     Graphilor 3 graphite tubes are extruded, sintered and thoroughly impregnated with phenolic resin. Graphite tube sheets are manufactured from graphite block material. The tubes are cemented into the graphite tube sheets to produce the tube bundle which is inserted into the shell. The heat transfer takes place by heat conduction through the graphite tube walls between the process side and the service side.

Small graphite shell and tube heat exchanger
GAB Neumann’s offers small (from 10 m2) to very large (up to 1850 m2) graphite shell and tube heat exchangers.

Inspection of Graphilor 3 tubes
Visual inspection of Graphilor 3 graphite tubes after extrusion. Graphilor 3 graphite tubes are thoroughly inspected throughout their entire production process. Every single tube is tested at high pressure.

Carbon fiber reinforced Graphilor3 tubes
Graphilor3 tubes are extruded, sintered, impregnated, and machined in France. GAB Neumann manufactures all the other components and assembles the graphite shell and tube heat exchanger in its production facility in Maulburg, Germany.

      With their specific design our annular groove graphite evaporators and reboilers are especially adapted to the evaporation of highly corrosive chemicals. Annular groove evaporators & reboilers turn the liquid form of a chemical substance such as water or a solvent into its gaseous-form. It is often used to concentrate solutions by evaporation of the solvent. We offer annular groove falling film evaporators, as well as natural and forced circulation reboilers. Annular groove evaporators and reboilers transfer heat from condensing steam or thermal oil on service side to a boiling liquid on process side. Graphite discs are machined to create annular grooves on service side and large banana shaped channels on the process side. Heat is transferred by conduction through the impervious graphite left between the process and the service channels. Annular groove graphite evaporators consist in a stack of discs that are fused together.

Details of an annular groove graphite reboiler
      GAB Neumann’s reboilers consist of series of concentric annular grooves and channels that are machined in graphite discs. In this very case the service side fluid flows in three parallel grooves.

Details of an annular groove graphite falling film evaporator
      GAB Neumann’s falling film evaporators consist in a liquid distribution and an evaporation section. Here is the evaporation section.

      GAB Neumann’s has an extended experience in the sizing, design and manufacturing of graphite heat exchanger. Over the last 50 some years we have designed, adapted and/or customized our products to best meet with the highly specific and sometimes unique requirements (multiple stages condensation, crystallization, continuous reactor, reverse sublimation, etc…) of our customers.

Custom-designed crystallizer 
The graphite section of a crystallizer is designed to enable crystallization while preventing clogging. The very large slots enable the crystallization without any clogging risk.

Distribution section of a falling film evaporator

     GAB Neumann’s falling film evaporators have a unique design that ensures their higher efficiency.