The knowledge of biomass char gasification kinetics has considerable importance in the design of advanced biomass gasifiers, some of which operate at high pressure. The char gasification kinetics themselves are influenced by char structure. In this study, the effects of pyrolysis pressure and heating rate on the char structure were investigated using scanning electron microscopy (SEM) analysis, digital cinematography, and surface area analysis. Char samples were prepared at pressures between 1 and 20 bar, temperatures ranging from 800 to 1000 °C, and heating rates between 20 and 500 °C/s. Our results indicate that pyrolysis conditions have a notable impact on the biomass char morphology. Pyrolysis pressure, in particular, was found to influence the size and the shape of char particles while high heating rates led to plastic deformation of particles (i.e. melting) resulting in smooth surfaces and large cavities. The global gasification reactivities of char samples were also determined using thermogravimetric analysis (TGA) technique. Char reactivities were found to increase with increasing pyrolysis heating rates and decreasing pyrolysis pressure.

Effect of pyrolysis pressure and heating rate on radiata pine char structure and apparent gasification reactivity | NOVA. The University of Newcastle's Digital Repository

Waste-cellulose-derived porous carbon adsorbents for methyl orange removal

Effects of demineralization on the surface morphology, microcrystalline and thermal transformation characteristics of coal

Investigation into the thermal behavior and FTIR micro-characteristics of re-oxidation coal

Pyrolysis synergy of municipal solid waste (MSW): A review.

Catalytic effect of metal chlorides on coal pyrolysis and gasification part I. Combined TG-FTIR study for coal pyrolysis

Catalytic effect of metal chlorides on coal pyrolysis and gasification part II. Effects of acid washing on coal characteristics

Influence of hydrothermal dewatering on trace element transfer in Yimin coal

The comparative effects of five metal chlorides (KCl, CaCl2, NiCl2, MnCl2, and ZnCl2) on the catalytic pyrolysis, especially the volatile gas release characteristics of lignite over a high-temperat...

Catalytic Effect of Metal Chloride Additives on the Volatile Gas Release Characteristics for High-Temperature Lignite Pyrolysis

Pyrolysis was carried out in an entrained flow drop-tube furnace (DTF) and tube furnace (TF) using Pingzhuang lignite coal with various catalyst concentrations (2 wt%, 4 wt%, and 6 wt%) of KCl and CaCl2 for the syngas component at 800°C–1200°C. Five catalysts (KCl, CaCl2, NiCl2, MnCl2, and ZnCl2) at 6 wt% were chosen for DTF at 800°C–1200°C. An online gas chromatograph analyzer and the Fourier transform infrared spectra were used for the analysis of the syngas and char structure. Results showed that the overall CO2 and CH4 content in DTF was lower than that in TF, mainly due to the CH4 carbon reaction at high temperature. Moreover, the CO% in DTF was higher than in the TF experiment, as char reacts with carbon dioxide to form carbon monoxide. In DTF experiment, the maximum and minimum CO2 content was 15.20% with 6 wt% Mn at 800°C and 0.33% with 6 wt% K at 1100°C, respectively. The maximum CO% was found in raw coal. Concentrations of Mn2+, Zn2+, and K+ can significantly increase H2%, whereas Ca2+ and Ni2+ have a minor effect on H2%; however, the overall presence of catalyst has a positive impact on the H2 content.

Longlong Liu

Papers

Catalytic effect of metal chlorides on coal pyrolysis and gasification part I. Combined TG-FTIR study for coal pyrolysis

Catalytic effect of metal chlorides on coal pyrolysis and gasification part II. Effects of acid washing on coal characteristics

Influence of hydrothermal dewatering on trace element transfer in Yimin coal

Catalytic Effect of Metal Chloride Additives on the Volatile Gas Release Characteristics for High-Temperature Lignite Pyrolysis

Metal chloride influence on syngas component during coal pyrolysis in fixed-bed and entrained flow drop-tube furnace