Metal

Coatings for plants for environmentally sound drying in the foodstuff industry: process development and practical testing (Part 2)


Spray drying processes can be evaluated with the developed method, with regard to fouling build-up, cleanability and reproducibility of fouling behaviour. The available means for measuring and evaluating monetary and material savings potentials are thus provided.

Summary

The baked-on deposits on the internal metal walls that are caused by the process in spray and atomisation dryers require great cleaning effort. Using deposit-preventing coatings for the dryer walls, both water consumption and wastewater loading were reduced, and lower-waste production and the associated energy savings were able to be realised.
In this partial project, criteria and measurement methods are to be developed with which the coatings developed in the partial project 1 and their application under near-production conditions can be evaluated.

Results:

  • The measurement methods developed allow the progress of baked-on deposits in spray towers / cyclones to be captured by metrology over time, and thus the deposit behaviour and fouling curves can be recorded. The applicability of these methods was demonstrated during drying experiments in an industrial pilot tower. They can be practically applied, and ensure reliable evaluation.
  • The functionality of the developed coating S7bII shown in lab samples could not be transferred to larger sample areas. Both the anti-sticking behaviour of the surfaces for whey solids powder, and the strength/adhesion of the surface active coatings, were not satisfactory. The low surface energy could not be maintained under real-world conditions (alkaline influence).
  • The low-energy surfaces developed are, however, suitable for coating containers for liquids. With the observed properties, it is possible to empty such containers more easily, and to reduce product losses (due to sticking remnants).

Project Participants

Implementing Institutions

Braunschweigische Maschinenbauanstalt AG

Cooperation Partner

Gesellschaft für umweltkompatible Prozeßtechnik mbH (upt)

More Project Information

Project title:
Coatings for plants for environmentally sound drying in the foodstuff industry: process development and practical testing (Part 2)

Project number: 0339878

Project period: 2000 - 2003

Project region:
Germany (Lower Saxony)

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Source: German National Library of Science and Technology Hannover (TIB)