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Abstract: This paper describes the radiative energy flux characteristics of fixed-bed oxy-coal combustion for the purpose of guiding the quality-splitting conversion of combustion energy. An experiment was performed in a tube furnace at a temperature range of 800–1200 °C in O₂/N₂ and O₂/CO₂ atmospheres, and the radiative intensity was measured. It was found that an increase in oxygen concentration and temperature could increase the radiative intensity more than 1.5 to 2 fold during combustion, and the radiative energy flux was higher for semi-coke than coal by about 16%–27%. The radiative energy results could be described by a semi-empirical model and an artificial neural network (ANN) model. The results showed that the errors of the ANN were less than 0.01%, and demonstrated the superiority of the ANN. This study provides guidance for subsequent research on quality-splitting conversion of combustion energy.

This paper did the research on radiative energy flux of coal and semi-coke bed combustion in O2/N2 and O2/CO2 atmosphere with a tube furnace experiment rig and the semi-empirical model and the artificial neural network model. The paper proposed a new method to study the bed combustion characters of fuels in oxy-fuel atmosphere. The models are good by comparation with exp. data and can be useful to describe the radiation heat transfer process in the same combustion conditions.

一维固定床煤粉富氧燃烧的辐射能流特性与模型分析

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