current paper was dedicated to improvement of combustion process of disposal lubricant oil through enhancing dispersion and mixing process by means of a special designed burner. Numerous experimental trials were carried out in order to investigate the ability of burning disposal lubricant oil steadily. Three combustion air twirlers were manufactured with vanes angles 30°, 45° and 60° which were assembled co-axially with a single-hole externally mixed atomizer. In order to improve the combustion process, three hollow conical spinning elements were designed and installed at the atomizer exit with half cone angles 30°, 45O and 60°. Each conical element has four passages through which compressed air was discharged tangent to the inner surface of the hollow-cone. Consequently, the disposal oil droplets became finer and were provided with swirling motion. Each element was conjugated to the corresponding combustion air swirled with the same angle and direction in order to enhance the swirling and turbulent effects of the mixture. As a result; more-stable flames were successfully attained and gas temperature values along the combustor were increased remarkably.