produced during the burning of the waste tires by recycling it as a carrier gas instead of requiring an apparatus or equipment for providing and recycling additional carrier gas composed of carbon dioxide or nitrogen the carrier gas circulating provider 20 is installed to be connected to the condensed gas circulating line cl herein the condensed gas circulating line cl indicates a path which passes the pyrolyzing furnace 1 and the oil collecting means and recycles to the pyrolyzing furnace 1 and it is shown as u201c cl u201d the carrier gas circulating provider 20 installed on the condensed gas circulating line cl is provided with a sensor for measuring the temperature in the pyrolyzing furnace 1 and the pressure in the condensed gas circulating line cl and it collects and reserves the condensed gas produced in the pyrolyzing furnace 1 and selectively circulates it to the pyrolyzing furnace 1 herein the carrier gas circulating provider 20 is a sensing element and it includes a pressure measurer 21 for measuring the pressure in the condensed gas circulating line cl and a temperature measurer 23 for measuring the temperature in the pyrolyzing furnace 1 the pressure measurer 21 and the temperature measurer 23 can be embodied by means of well known analog or.