Effect of CaO on catalytic combustion of semi-coke

Author:

Kou Luyao123,Tang Junjing123,Hu Tu123,Zhou Baocheng4,Yang Li123

Affiliation:

1. Yunnan Provincial Key Laboratory of Intensification Metallurgy, Kunming University of Science and Technology , Kunming 650093 , Yunnan , China

2. State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization (Kunming University of Science and Technology) , Kunming 650093 , Yunnan , China

3. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology , Kunming 650093 , Yunnan , China

4. Kunming University of Science and Technology Design and Research Institute , Kunming 650093 , Yunnan , China

Abstract

Abstract Generally, adding a certain amount of an additive to pulverized coal can promote its combustion performance. In this paper, the effect of CaO on the combustion characteristics and kinetic behavior of semi-coke was studied by thermogravimetric (TG) analysis. The results show that adding proper amount of CaO can reduce the ignition temperature of semi-coke and increase the combustion rate of semi-coke; with the increase in CaO content, the combustion rate of semi-coke increases first and then decreases, and the results of TG analysis showed that optimal addition amount of CaO is 2 wt%. The apparent activation energy of CaO with different addition amounts of CaO was calculated by Coats–Redfern integration method. The apparent activation energy of semi-coke in the combustion reaction increases first and then decreases with the increase in CaO addition. The apparent activation energies of different samples at different conversion rates were calculated by Flynn–Wall–Ozawa integral method. It was found that the apparent activation energies of semi-coke during combustion reaction decreased with the increase in conversion.

Publisher

Walter de Gruyter GmbH

Subject

Health, Toxicology and Mutagenesis,Industrial and Manufacturing Engineering,Fuel Technology,Renewable Energy, Sustainability and the Environment,General Chemical Engineering,Environmental Chemistry

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