Paper details

Title:

Effect of Biomass Mineral Matter on the Pyrolysis Product Yields

Author(s):

Ibrahim, N, Jensen, P.A., Dam-Johansen, K.

Document(s):

Abstract:

This paper investigates three different biomasses, wheat straw, rice husk and pine wood which were subjected to pyrolysis in a pyrolysis centrifuge reactor (PCR) to produce liquid oil (pyrolysis oil), solid char and non­condensable gases. The aim was to study the influence of biomass type, particularly the contents of mineral matter in biomass, on the pyrolysis product yield. The reactor temperatures were varied between 475 °C and 575 °C. The ash content in wheat straw, rice husk and pine wood were 6.02, 13.6 and 0.5 % db, respectively. Wheat straw ash contains a high fraction of potassium, rice husk is rich in silica and pine wood is characterized by a high calcium content. The experimental results showed that the maximum liquid organics yield temperature was around 525 °C for straw and around 550 °C for both rice husk and pine wood. At their optimum temperatures, the liquid organics yield of 49, 52 and 58 wt % (daf) respectively were obtained for straw, rice husk and pine wood. The gas + water formation was higher for straw and it kept increasing with temperatures. Compared to straw and wood, the char yield obtained from rice husk was the highest. The obtained results indicate that alkali metals in biomass ash significantly affect the pyrolysis products yield and pyrolysis behavior by shifting the optimum degradation temperature and by catalyzing the conversion of tar to gases.

Keywords:

biomass, pyrolysis, pyrolysis oil, ash

Topic:

Thermochemical conversion - Pyrolysis for power, CHP, polygeneration and chemicals

Subtopic:

Pyrolysis for power, CHP, polygeneration and chemicals

Event:

18th European Biomass Conference and Exhibition

Session:

VP2.3.22

Pages:

1022 - 1026

ISBN-13:

978-88-89407-56-1

ISBN-10:

88-89407-56-5

Paper DOI:

10.5071/18thEUBCE2010-VP2.3.22

Price:

FREE