Improved relationships between kinetic parameters associated with biomass pyrolysis or combustion.

Improved relationships between the kinetic parameters (pre-exponential factor and kinetic energy) associated with biomass pyrolysis or combustion processes are proposed. These relationships rely on observations of the mass and mass rate curves and on the experimental data through computations performed on the kinetic model which describes the mass evolution of each pseudo-component of the biomass during its thermal degradation. These relationships improve the so-called kinetic compensation effect.

Modeling SO trapping on a copper-doped CuO/SBA-15 sorbent material.

A mixture of SO and air was continuously injected in a fixed bed reactor containing a CuO/SBA-15 sorbent material and submitted to an isothermal temperature between 325 and 400 °C. The SO emissions were measured at the exit of the reactor. Different isothermal temperatures, different injected SO concentrations and different sorbent masses, all representative of industrial conditions, were tested.

Combustion of hydrolysis lignin in a drop tube furnace and subsequent gaseous and particulate emissions.

The aim of the study was to analyze the combustion of hydrolysis lignin in industrial plants which use pulverized combustible and which are characterized by very high heating rates (up to 10 K/min). Pulverized samples of hydrolysis lignin and of spruce bark or spruce trunk for comparison were injected in a drop tube furnace under an oxidative flow (synthetic air) and under an isothermal temperature (between 800 and 1200 °C) in the reaction zone. The gaseous and particulate emissions were analyzed.

Thermal degradations of wood biofuels, coals and hydrolysis lignin from the Russian Federation: Experiments and modeling.

The thermal degradation of wood biofuels (spruce, pine), of coals from different fields of the Russian Federation and of hydrolysis lignin is investigated using a thermogravimetric analyzer under different heating conditions and under non-oxidative or oxidative atmospheres. The samples are indeed submitted to a linear temperature ramp of 10K/min or to a temperature ramp of 200K/min up to a residence temperature between 250 and 450°C where they are maintained during 4h (isothermal conditions). The values of the kinetic parameters are determined for these different samples in both thermal conditions, either using the differential isoconversional method or by means of an Extended Independent Parallel Reaction (EIPR) model.