Effect of mineral matters in biomass on the gasification rate of their chars

Abstract

In order to develop the effective utilization of biomass, the gasification behavior (changes in gasification rates against conversion) of various chars prepared from biomass at 1,000°C was studied. The gasification rate of char with CO 2 measured at 900°C by a thermogravimetric balance was affected by the content of indigenous mineral matter such as calcium and potassium. The gasification behavior of chars were classified into following three groups: (1) the gasification rate reached a maximum in the higher conversion region, (2) the gasification rate profile showed two peaks around char conversion of 0.2 and 0.6 or higher, (3) the gasification rate profile fitted the random pore model. An increase in the gasification rate in a higher char conversion region was attributed to the promotion effect of the potassium catalyst. The number of active centers in the char was obtained by the O 2 uptake at 200°C using pulse technique. The number of active sites was increased by potassium and calcium in biomass and the amount of O 2 uptake well correlated the char gasification rate.

Catalytic effect of Ca and K on CO 2 gasification of spruce wood char

“…They concluded that both metals enhanced the char gasification rate compared to the raw wood char [2]. In a recent study Suzuki et al showed that by adding both Ca and K to an acid treated sample the reactivity of the untreated wood sample could be reproduced, thus showing that the reaction rate during char gasification of woody biomass was strongly dependent on these two elements [26]. The authors did not, however, specify the level of loading.…”

Pyrolysis of pine and gasification of pine chars – Influence of organically bound metals

“…These conditions are chosen to maximize the production of liquid products. Gasification involves the oxidation of the char with a sub-stoichiometric amount of oxygen in a reactive atmosphere containing oxygen, steam or carbon dioxide as the reactive phase (Suzuki et al, 2011).…”

Gaseificação De Biochar Obtido Da Pirólise De Bagaço De Maçã Visando Sua Utilização Para Geração De Energia

“…Isso ocorre porque o modelo não é capaz de descrever os picos em alta conversão das curvas de reatividade apresentadas nas Figuras 1a e 1b. Estes picos são atribuídos à ação catalítica da matéria mineral presente na biomassa (Suzuki et al, 2011). Os resultados das Tabelas 3 e 4 indicam uma diminuição na energia de ativação da amostra de bagaço de maçã que foi pirolisada com taxa de aquecimento alta, em relação à amostra da pirólise lenta, confirmando as discussões do item anterior.…”