Evaluation of thermal decomposition characteristics and kinetic parameters of melina wood

Abstract

The evaluation of thermal decomposition characteristics and kinetic parameters of melina wood were investigated. Proximate, ultimate and calorific value analyses of the melina wood were carried out based on standards. Melina wood was subjected to multiple heating rates (5-15 C/min) in thermogravimetric experiment. Two prominent isoconversional methods (Flynn-Wall-Ozawa and Starink) were adopted to obtain kinetic parameters from the non-isothermal thermogravimetric analysis curves. The ash, volatile matter and carbon contents of the melina were 2.15, 81.42 and 47.05%, respectively, while the calorific value was 18.72 MJ/kg. The main devolatilization stage of melina ranged from 220 C to 350 C while 80% weight loss was obtained below 400 C. The activation energy varied between approximately 15 and 162 kJ/mol as a function of degree of conversion. The pre-exponential factors varied between 1.60E þ 2 and 5.67 E þ 12/min. The decomposition kinetic mechanism of melina is concluded to be a multi-step reaction.

The ignitability, fuel ratio and ash fusion temperatures of torrefied woody biomass

“…During torrefaction, 46 g of wood fines were heated under a continuous N2 flow to the desired temperature (220, 240, 260, 280, 300 or 320 C) at a heating rate of 12 C/min. The samples were held at that temperature for a residence time of 60 min as recommended by [21,22,23].…”

“…The present study aims to produce biochar with a high fuel ratio and improved ignitability while reducing the volatile matter contents in the biomass. It is therefore important to carefully select temperature which has been reported to have the largest influence on the properties of biomass when subjected to the torrefaction process [21,22,23]. Thus, to obtain the desired fuel ratio, ignitability, and energy contents, torrefaction must be carried out between 220 and 320 C.…”

Sustainability of multifaceted usage of biomass: A review

“…The planks can be used for construction and furniture works, while the sawdust can be utilized in composite material formation or energy generation ( Ibikunle et al., 2020 ). The sawdust often contributes to waste generation that constitutes unsightly scene and environmental degradation ( Adeleke et al., 2019a , b , c ; Odusote et al., 2019 ). Similarly, periwinkle shell is obtained from the consumption of periwinkle ( Taulbee et al., 2009 ; Nwabue et al., 2017 ) and rice husk is derived from the processing of rice ( Ikelle et al., 2017 ).…”

“…Carbon dioxide is also a warm gas, and its formation leads to the warming up of the atmosphere that leads to global warming. The effects of global warming include, thinning away of the ice in the cold regions of the earth, climate change issues like excessive rainfall and excessive heats ( Poudel et al., 2011 ; Gaballah et al., 2015 , Odusote et al., 2019 ; Adeleke et al., 2019a , b , c ; 2020a , b ). Droughts are more prolonged in the southwest region and there is a global sea level rise.…”

Kinetics modeling, thermodynamics and thermal performance assessments of pyrolytic decomposition of Moringa oleifera husk and Delonix regia pod

“…The role of kinetics modeling is vitally critical to understanding the underlying phenomena and mechanisms that govern thermal processes, making it a complementary tool to experimental analysis. It has been noted that pyrolysis kinetics could produce sub-models that could be coupled to transport phenomena equations to aptly describe thermochemical conversion processes, and also help in the design of efficient reactors 4 , 16 , 17 . To obtain the kinetic data, either model-fitting or iso-conversional techniques could be utilized.…”