| Title | Re-designing a viable ELTs depolymerization in circular economy: Pyrolysis prototype demonstration at TRL 7, with energy optimization and carbonaceous materials production |
|---|---|
| ID_Doc | 16648 |
| Authors | Antoniou, N; Zabaniotou, A |
| Title | Re-designing a viable ELTs depolymerization in circular economy: Pyrolysis prototype demonstration at TRL 7, with energy optimization and carbonaceous materials production |
| Year | 2018 |
| Published | |
| Abstract | The present study aims to demonstrate challenge-based innovations of ELTs depolymerization, show evidence of promising developments and improve pyrolysis performance towards its economic viability. A pyrolysis prototype, with a ELTs mass flow rate of 20 kg h(-1) was designed, constructed, and demonstrated. Up to 100 kg h(-1) of steel-free tyre granulates were pyrolyzed for up to 100 h continuous operation. The tests were carried out at 550 degrees C, under atmospheric pressure and residence time similar to 12 min with good reliability and reproducibility. All three pyrolysis products showed good fuel characteristics. The LHV of the obtained producer gas estimated to 23.5 MJ Nm(-3) and 26% of the prototype energy requirements were provided by using the producer gas as fuel. Pyro-oil showed high carbon content (86.04 wt%), GCV of 44.2 MJ kg(-1) and H/C ratio (1.74). Despite its higher sulphur content, pyro-oil is comparable to diesel fuel in all other characteristics. Chars exhibited high percentage of fixed carbon (> 80 wt %) and a high GCV = 30.3 MJ kg(-1). S, Zn and Si were detected in chars, at low concentration. Based on surface and structural characteristics, chars were considered comparable to carbon blacks of N400-N500 series. Upgrading of char to activated carbon by physical and chemical activation, increased N-2 surface area to 589 m(2) g(-1) and 402 m(2) g(-1), respectively. The study contributes significantly to increase knowledge on the viability of pyrolysis, providing to the recycling sector an opportunity for the deployment of take-off systems, within a Circular Economy. End of Life Tyres (ELTs) pyrolysis can be viable, if all produced streams are valorized. (C) 2017 Elsevier Ltd. All rights reserved. |
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