Biomass Thermochemical Conversion via Pyrolysis with Integrated CO2 Capture

Abstract

The presented work is focused on biomass thermochemical conversion with integrated CO2 capture. The main aim of this study was the in-depth investigation of the impact of pyrolysis temperature (500, 600 and 700 °C) and CaO sorbent addition on the chemical and physical properties of obtained char and syngas. Under the effect of the pyrolysis temperature, the properties of biomass chars were gradually changed, and this was confirmed by examination using thermal analysis, scanning electron microscopy, X-ray diffraction, and porosimetry methods. The chars were characterised by a noticeable carbon content (two times at 700 °C) resulting in a lower O/C ratio. The calculated combustion indexes indicated the better combustible properties of chars. In addition, structural morphology changes were observed. However, the increasing pyrolysis temperature resulted in changes of solid products; the differences of char properties were not significant in the range of 500 to 700 °C. Syngas was analysed using a gas chromatograph. The following main components were identified: CO, CO2, CH4, H2 and C2H4, C2H6, C3H6, C3H8. A significant impact of CaO on CO2 adsorption was found. The concentration of CO2 in syngas decreased with increased temperature, and the highest decrease occurred in the presence of CaO from above 60% to below 30% at 600 °C.

Pyrolysis of Biomass Wastes into Carbon Materials

“…The following parameters were defined based on the TG and DTG curves: ignition temperature, burnout temperature, temperature of the highest peak DTG, maximum and average mass loss rate, as well as times of maximum peak, ignition, burnout, and DTG/DTG max range = 0.5 (∆t 1/2 ). These parameters were used to calculate the following indexes: ignition (D i ), burnout (Df), and combustion (S and H f ) [33]. The methodology of calculating indexes and establishing parameters is described in papers [34][35][36].…”

Influence of Torrefaction and Pelletizing of Sawdust on the Design Parameters of a Fixed Bed Gasifier

“…Nonetheless, only scarce amount of work has been dedicated to numerical models of gasification of torrefied biomass in a fixed bed. However, more recently some works were dedicated to modelling of the pyrolysis of thermally thick biomass particles, which could be considered as laying the foundation for comprehensive numerical modeling of the gasification of biomass in fixed bed reactors [44][45][46][47][48].…”

Contemporary Problems in Combustion—Fuels, Their Valorisation, Emissions, Flexibility and Auxiliary Systems

“…Sieradzka et al [7] investigated the pyrolysis of biomass integrated with CO 2 capture. Carbon capture can be instrumental in achieving ambitious decarbonisation targets, and has been recognised by the UNFCCC.…”

“…Carbon capture can be instrumental in achieving ambitious decarbonisation targets, and has been recognised by the UNFCCC. Therefore, novel solutions are currently being developed, including carbon sequestration using hydrates, membrane-based carbon capture and storage, as well as pre-combustion CO 2 capture, or novel cycles [7,8]. Most of the work has been performed so far on post-combustion CCS and the proper integration of CCS with power plants [8].…”

“…This offers interesting perspectives for using such fuels in gas turbines, either for energy generation or as a fuel in the aviation sector, with the additional importance in terms of energy storage. Sieradzka et al [7] reported that the in situ use of CaO during pyrolysis allowed achieving much lower concentrations of CO 2 , thus improving overall gas quality [7].…”