Abstract
Combustion of pyrolysis oil has attracted many attention in recent years as a renewable and environmental friendly fuel. However, pyrolysis oil as an multi-component fuel has some differences compared to conventional fossil fuels. One of the main differences is the formation of solid char in the droplet during evaporation. The goal of this work is to study the effect of the solid char on the combustion characteristics of multi-component fuel. An Euler-Lagrange model of three phase gas/liquid/solid combustion is developed to study the detailed information about every phenomena in the process such as: heat, mass and momentum transfer between droplet and gas phase, droplet evaporation, homogeneous and heterogeneous reactions. The results indicate that the presence of the solid char and consequently its combustion elongates significantly the combustion region in a typical spray injection chamber/burner. Moreover, the gas phase reaches higher temperatures as a result of char combustion that creates more heat by heterogeneous oxidation as a kind of afterburner.
Highlights
The worldwide concern regarding global warming has increased the interest of using biomass as a renewable and CO2 neutral source of energy
Each particle/droplet consists of two phases, while it interacts with the surrounding gas phase by heat, mass and momentum transfer
The homogeneous reaction of vapor phenol in the gas phase is faster compared to the heterogeneous reaction of the solid char
Summary
The worldwide concern regarding global warming has increased the interest of using biomass as a renewable and CO2 neutral source of energy. Thermally liquefied biomass has a multicomponent nature and it is difficult to use in conventional combustion systems. As one of the most important products of biomass conversion, has the potential to be used as a fuel oil substitute in many applications for heat or electricity generation. A comprehensive literature review on the application of bio-oil has been done by No (2014). Pyrolysis-oil properties and its behavior during combustion are considerably different from conventional fossil fuels.
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