ISOCOOL – the new Dieffenbacher rapid cooling system for increasing the production quality

ISOCOOL is equipped with an infinitely variable control system to optimize the cooling process to significantly increase the product quality. As the cooling capacity can be ideally adapted to any material specification, additional new production processes become possible.

In the  new  rapid cooling  system,  inner  gas  circulation  is   started  at  the  end  of  the  holding  phase.  This  inner  gas   circulation  is  driven  by  an  ejector  pump  built  into  the   interior  of  the  pressure  vessel.
The suction jet pump works without moving parts and is driven by the feeding of high-pressure gas which is produced by the external compressor.
The compressor works within the circuit, i.e. it extracts gas from the pressure vessel and returns it to drive the suction jet pump. Inside the pressure vessel, the suction jet pump extracts gas from outside the heat insulation and pumps it through pipelines leading to the upper end of the working zone, where it is injected tangentially. A turbulent swirl similar to a cyclone is created as a result of the tangential injection and the high kinetic energy.

Because cold gas has a higher density than hot gas, the injected gas remains predominantly in the outer area. The cyclone of cold gas slowly descends and increasingly mixes with the hot gas in the working zone. 
The heat insulation is gas-tight at the top and has side opening slits at the lower end.

As gas is fed in at the top, the same quantity of gas must be able to escape at the bottom. However, this hot gas does not reach the pressure vessel wall directly but is first mixed with cold gas in an intermediate duct system and then further cooled by a type of heat exchanger before flowing to the pressure vessel wall at the upper end of the insulating hood. The inner wall of the pressure vessel has a cooling liner on which the gas is further cooled.

In the base area of the pressure vessel, the gas cooled in this way is sucked in again by the suction jet pump in order to maintain circulation. 
The rapid cooling system described can also be retrofitted to existing plants.  

This  operation  can  generally  be  performed  by exchanging  the  furnace  insert  and  the  heat   insulation,  without  impairing  the charge volume.

The main benefits of the newly developed rapid cooling system are:

• Closed-loop control of cooling up to 100°C per minute


• Cooling power can be ideally adapted to any material specification


• Homogeneous cooling within the entire working zone


• Optimized product quality


• Permanently controlled temperature profile of the pressure vessel


• No moving parts inside


• Low maintenance


• Easy retrofitting without impairing the charge volume

Contact for further information:

Dieffenbacher GmbH + Co. KG

Stefan Rotter
Sales, High-Pressure Technology
Heilbronner Straße 20
75031 Eppingen
Germany

Phone: +49 7262 65-105
Fax: +49 7262 65-116
Email: stefan.rotter(at)dieffenbacher.de
Web: www.dieffenbacher.de

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