The Guidelines for the Design and Layout of Oxy-Fuel Combustor Based on the Experiments of Pulverized Coal Combusted in Ar, N₂ and CO₂ Respectively

Abstract

The oxy-fuel combustion technology is going to be a key solution for CO₂ capture and sequestration. And the era of oxy-fuel combustion is approaching. However, the combustion characteristics, such as ignition, flame stability, and combustion duration, have changed because the coal particles are combusted in CO₂ atmosphere. Thus, the novel design technologies of combustor used in oxy-fuel combustion technology are demanded. We have concluded several critical rules from the experiment data obtained from the coal particles combusted in a retrofitted fixed bed reactor in Ar, N₂ and CO₂ respectively. The coal particles are prone to be ignited but take more time to burn up in CO₂ atmosphere at low temperature of 1,000–1,300°C comparing to the data obtained from N₂ and Ar atmospheres under the same conditions. And when at high temperature of 1,600°C, the combustion duration of coal particles combusted in CO₂ is the same with that of Ar and N₂ situation. The NO_x is prone to released ahead of the carbon combustion at relatively high temperature, and the priority of NO_x release to Carbon combustion is aggravated as the temperature increases. The overall analysis and comparison among the three atmospheres make the novel design and layout of oxy-fuel combustor feasible. Consequently, the guidelines for these aims basing on those rules conclude from the experimental data and the relative researchers’ work are discussed and a novel design of oxy-fuel burner is put forward and simulated in this paper.