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Clean Coil Technology
Pfaudler - Glass-Lined & Alloy Systems
Technologies
Identify the problem – Avert risks: Pfaudler Clean Coil Technology
Frequent damage that occurs in glass-lined reactors with half pipes as external heating/ cooling system is leaking, after a short number of cycles of the half pipes in the lower dish. The crack pattern is quite characteristic: a large number of parallel cracks running perpendicularly to the half coil’s axis is observed, whereas the welded seam between the lower reactor head and the half coil is not damaged.
Pfaudler has thoroughly analysed the mechanism leading to this type of damage and developed a glassing/firing method referred to as “Pfaudler Clean Coil” – PCC patented”.
What is the Pfaudler Clean Coil method?
Half pipes are attached to the outer reactor wall, already before glassing, and are repeatedly fired along with the reactor up to 850°C, which is the temperature required for glassing. This process leads to a local deterioration of the yield point and a reduction of the anti-fatigue properties of the half coil pipe material.
The Pfaudler Clean Coil method consist in a special pre-treatment of the half coil pipe, combined with optimized temperature control during glass application, in order to prevent scaling inside the half coil pipes and a structural transformation of the material.
Half coil inside with standard firing process
Half coil inside with Pfaudler Clean Coil firing process
What are the benefits of the Pfaudler Clean Coil method?
The benefits of the Pfaudler Clean Coil are numerous:
- Longer lifespan of the half pipe coils in case of high temperature differences between the heating/cooling circuit and the reactor content, due to improved anti-fatigue properties of the steel;
- Improved heat transfer to the reactor wall due to drastically reduced scaling;
- Reduced pressure drop in the half pipes: smooth surfaces minimize deposits;
- Limited contamination of filters protecting the pumps in the heating/ cooling circuit from scaling residues.
Half coil with standard firing process
Half coil fired with Pfaudler Clean Coil firing process
