Numerical simulation of the wood pyrolysis with homogenous/ heterogeneous moisture using FireFOAM. (15th June 2020)

• Record Type: Journal Article
• Authors: Liu, Haoran; Wang, Changjian; Zhang, Aifeng
• Is Part Of: Energy. Volume 201(2020)
• Publication Date: 2020-06-15
• Subjects: Pyrolysis -- Wet wood -- FireFOAM -- Moisture gradient; Power resources -- Periodicals; Power (Mechanics) -- Periodicals; Energy consumption -- Periodicals; 333.7905
• DOI: 10.1016/j.energy.2020.117624
• Languages: English
• ISSNs: 0360-5442

Abstract

Abstract: The effects of homogenous and heterogeneous moisture on wet wood pyrolysis are investigated using modified FireFOAM. The wet wood pyrolysis model was used by considering one-step moisture drying and one-step wood pyrolysis, which simplified the kinetic of intermediate solids. In homogeneous cases, the maximum mass fluxes of vapor and pyrolysate increase with the increased initial moisture content and there is only one peak on the mass flux curve of pyrolysate in the cases of wood thickness of 2 mm and 5 mm, while two peaks appear in the cases of 12 mm and 20 mm. In heterogeneous cases, the heterogeneous moisture significantly changes the mass fluxes and duration time of pyrolysate and vapor. The detailed comparisons of the duration of vapor and the maximum mass fluxes of vapor and pyrolysate were also presented between homogeneous and heterogeneous moisture. This work provides a more comprehensive understanding for the wet wood pyrolysis. Graphical abstract: Image 1 Highlights: The effect of moisture gradients on the wet wood pyrolysis was first clarified. Oxidation and flame are considered in the current pyrolysis model of wet wood. One-step reaction mechanism takes place of multiple parallel reactions. Moisture content and gradient affects the pyrolysis behaviors of wet wood. This work provides a more comprehensive understanding of wet wood pyrolysis.