Coal burners for the entrained flow gasifier.

Gasification characteristics were studied in a single-burner gasifier and a four-burner gasifier to determine the upper and lower burner structures for two-stage circling gasifiers. In order to achieve high efficiencies under stable gasification conditions, it is necessary to obtain long residence times of reactive chars injected from the upper burners and to obtain short flames for the lower burners. It was found that an internal mixing-type burner could achieve a better coal/oxygen mixture than an external type, and favorable mixing was easily attained by adding swirling action to both burner types. The flame length of the internal mixing burner with swirl was shorter than that of the other burner without swirl. Carbon conversion of the internal mixing burners with strong angular momentum was higher than that of the other type of burner.