Search

Browse

• Communities
• Authors
• Year
• Titles
• Subjects

My Space

• Login

Παραμετρική μελέτη για την αύξηση της απόδοσης σε αέριο σύνθεσης από αεριοποίηση στερεών καυσίμων, μέσω ανακύκλωσης των παραπροϊόντων και καταλυτών. Θερμική ανάλυση και μοντελοποίηση

Teftiki Agapi

Full record

---

Summary

The gasification of agricultural, forestry and industrial waste biochars with CO2 was examined, in order to evaluate the thermal behavior, the reactivity, the conversion to fuel gas and the kinetic parameters of the process. The influence of pore structure, chemical functional groups, inherent mineral matter, external catalysts and bio-oil blending was examined. The gasification experiments were conducted in TG/DTG thermogravimetric analyzer. The catalysts used were Li2CO3, K2CO3, CaO at 10-30% wt. For the kinetic analysis an independent parallel reactions model was developed.The reactivity of the biochras was ranked as follows: cotton residues > sawdust > sunflower > grape husks > RDF > pine needles. Cotton residues presented the highest reaction rate, while sawdust the highest yield of CO. The yield of CO was increased by mixing the agricultural and forestry wastes with industrial wastes. High activation energy was required in order for the Boudouard reaction to take place, which ranged from 120 kJ/mole to 298 kJ/mole. In presence of catalysts, the yield of CO was increased up to 76% and the maximum gasification temperature, the reaction rate and the activation energy were decreased. The catalytic activity followed the order: CaO> K2CO3> Li2CO3. Furthermore, blending of biochars with bio-oil increased the yield of CO significantly. The gasification of mixtures, by addition of CaO (10% wt) as catalyst, increased the yield of CO by 3-26%. The kinetic model fitted the experimental results with great accuracy.

Available Files

Services