Fitted higher heating value from proximate analysis of torrefied pellets of Pinus taeda L.

Abstract

A proximate analysis by using multiple linear regressions was used for the first time to analyze torrefied Pinus taeda L. pellets. The result, obtained from three fitted equations: HHV = 0.3921 × FC + 0.1578 × VM (statistical R² = 99.91%), FC = 39.4886 – 0.1042×T – 0.5640×t + 0.0027×(T × t) (statistical R² = 75.05%), and VM = 0.3402×T + 1.4262×t – 0.0061×(T × t) (statistical R² = 99.75%), indicated that the torrefaction of the pellets increased their high heating value (HHV) and fixed carbon (FC) and decreased the volatile matters (VM). These equations fitted the results better than equations published elsewhere.

Keywords:

• Biomass energy
• factorial design
• multiple linear regressions
• pyrolysis

Additional information

Funding

This work was supported by The Brazilian National Council for Scientific and Technological Development (CNPq; grant numbers 307113/2016-7 and 307429/2017-2).