Charring pyrolysis of wood in fires by laser simulation

Products of wood gasification

“…4(a) shows that the rate decreases by more than a factor of three over a 12 minute exposure. This type of behavior was previously observed by Lee, et al [9] and Attreya [6]; it is predicted by the wood gasification models of Rung [11] and Kansa, et al [12], both of which use only a single step reaction to represent the complex pyrolysis .…”

“…Capillary GC fingerprints of tar from: (a) yellow pine irradiated at base case conditions, (b) yellow pine burned in a wood stove at "overnight burn" conditions .... Small wood samples (typically 4 x 4 cm face, 2-4 cm thick; white pine, red oak, plus two tests with yellow pine) were subjected to 9 uniform radiative heat fluxes (2 to 7.8 W/cm ) on one face. Other variables were sample grain orientation, thickness, exposure time and moisture content.…”

Analytical Investigations of Kinetic and Heat Transfer in Slow Pyrolysis of a Biomass Particle

“…Multi-step reaction schemes have been presented by Tinney (1965), Kung (1972), Chan et al (1985) and Koufopanos et al (1991). The heat of reaction of pyrolysis have been modelled by Lee et al (1976), while the effect of anisotropy of the pyrolysing medium has been considered by Kansa et al (1977). Miyanamie (1977) studied the effects of heat of reaction and Lewis number on the pyrolysis of solid particle.…”

The Needed Fire Science

“…Finally the gaseous pyrolysis products may further pyrolyze as they diffuse through the hot char or are overtaken as the pyrolysis region moves deeper into the solid fuel, Sometimes the resistance to pyrolysis gas flow is so high that pressure builds up below the char which is then expelled explosively. The analysis of the charring process has just begun (52)(53)(54)(55)(56). A proper treatment of cracking has not been attempted and nothing has been done with the theoretical and experimental study of, nor the statistics of the explosive removal of char.…”

“…Only rarely is sufficient known of the temperature dependence of the thermal properties to take this nonlinearity into account. The more complete analysis including the evaporation of moisture and pyrolysis of the virgin fuel has only been attempted a few times (53)(54)(55)(56)117). No set of equations have yet been accepted as general.…”