Thermal Degradation Characteristics and Kinetics of Oxy Combustion of Corn Residues

Abstract

Thermogravimetric analysis was used to investigate oxy combustion of corncob and stover. The biomass samples were heated from ambient temperature to 900°C at different heating rates of 10, 30, and 50 K/min. Both biomass samples showed similar weight loss patterns with three zones, corresponding to dehydration, devolatilization, and char combustion, but displayed different degradation temperatures. Increasing heating rate was found to shift the degradation patterns to higher temperatures. Decomposition rates of cob and stover may have been influenced by their lignocellulosic composition. The kinetic parameters of the thermal degradation process were also determined and compared using the Flynn-Wall-Ozawa and Kissinger-Akahira-Sunose methods. Both methods were found to give similar values and patterns of activation energy against conversion fraction. The average values were found to be in similar magnitude to those reported in the literature, around 170 and 148 kJ/mol for cob and stover, respectively.

Thermal Degradation Kinetics of Sugarcane Bagasse and Soft Wood Cellulose

“…Different kinetic models are proposed to understand degradation mechanisms through prediction of the kinetic parameters based on the data obtained from TGA curves. The kinetic parameters (i.e., A, n, and E) can be calculated from TGA data by using the following rate equation [ 20 , 21 , 22 , 23 ]: dα/dt = k(T)·f(α) where α represents the extent of reaction, which is determined from the TGA data (fractional mass loss), t is time, k(T) represents the temperature dependent rate constant expressed by an Arrhenius type expression, and f(α) denotes the particular reaction model, which determines the dependence of the reaction rate on the extent of reaction. In this study, the conversion rate is defined as: α = (W o − W t )/(W o − W f ) where W t , W o , and W f are time t, initial and final weights of the sample, respectively.…”

Energy and Emission Characteristics of Biowaste from the Corn Grain Drying Process

“…Nevertheless, corn waste is a valuable potential energy resource that can be used in both thermochemical and biochemical conversion processes. In previous research, the pyrolysis of corn cobs [31,32] and corn stalks [33] as well as their gasification [34] and combustion [35] was realized. Increasing the density of waste biomass through pressure agglomeration (pelleting, briquetting) allows its volume to be reduced and its properties as a solid biofuel to improve.…”

Dependency of the combustion behavior of energy grass and three other types of biomass upon lignocellulosic composition

“…Biomass is generally considered as an organic fuel derived from plants, including wood, agricultural wastes, herbaceous crops, and short‐rotation energy crops . Up to now, most studies have focused on the combustion of agricultural or woody biomass using thermogravimetric analysis (TGA), such as wood , pine sawdust , capsicum stalks , straw , sunflower , corn cob and stover , grape marc (i.e., skin, seed, and stalk) . In comparison to other traditional biomass fuels, energy crops are a promising alternative that are cost‐effective, and do not generally require particularly fertile soil good soil or high levels of fertilizer and pesticide application .…”