微粉炭燃焼場での石炭の着火特性とその機構

抄録

Ignition characteristics and its mechanisms in pulverized coal combustion are experimentally studied by using a swirling-flow turbulent pulverized-coal combustor, a thermogravimeter and a low-pressure coal pyrolysis reactor. In the ignition experiment, the released combustion gases are analyzed, and the composition of burning particles is measured by means of the proximate and ultimate analyses. The changes of specific surface area and surface structure are also measured by a BET method and a SEM, respectively. As a result, it is found that ignition characteristics and its mechanisms in coal are influenced by the volatile matter content, its evolution rate and mechanism, and the chemical species of released volatile matter. The evolution rate and mechanism of volatile matter determine whether coal particles ignite homogeneously or heterogeneously. During the ignition process, an H-component is released faster than a C-component. The composition of low-temperature volatile matter consists of the mixture of CH₄, H₂, CO and C₂H₆. The composition strongly affects the coal ignition.