Method for recycling waste tires

Abstract

Disclosed a method for recycling waste tires. The method comprises the steps of: sealing the inside of a pyrolysis furnace into which waste tires are inserted and injecting a carrier gas thereinto; pyrolyzing the waste tires by direct heating of the waste tires by the carrier gas injected into the pyrolysis furnace; and collecting oil by passing vapor generated in the pyrolysis step through at least one oil collection factor such as cooling, condensation, or centrifugal force. The method for recycling waste tires enables pyrolysis of the waste tires through circulatory supply of the carrier gas and direct heating, and thus prevents danger of explosion caused by conventional direct heating, secures safety, and improves oil collection rate via the direct heating.

1 . A method for recycling waste tires, comprising:
 sealing the inside of a pyrolysis furnace into which waste tires are inserted and injecting a carrier gas thereinto;   pyrolyzing the waste tires by direct heating with the carrier gas injected into the pyrolysis furnace; and   collecting oil by passing vapor generated in the pyrolysis step through at least one oil collection element of cooling, condensation, or centrifugal force.   
     
     
         2 . A method for recycling waste tires according to  claim 1 , wherein the carrier gas injected into the pyrolysis furnace passes the oil collection element and a heat exchanger with vapor generated from the pyrolyzed waste tires to be circulated and supplied to the pyrolysis furnace. 
     
     
         3 . A method for recycling waste tires according to  claim 1 , wherein the step of collecting oil consecutively comprises:
 a first oil collection comprising a condenser cooling and condensing supplied vapor to transfer the cooled and condensed vapor to an oil tank; and   a second oil collection comprising one or more cyclone collecting oil from supplied vapor that has not been collected in the first oil collection or oil mist consisting of small oil particles through centrifugal force to transfer the collected oil to the oil tank.   
     
     
         4 . A method for recycling waste tires according to  claim 1 , wherein the step of collecting oil further comprises a third oil collection comprising a separator tank directly contacting supplied vapor generated in the pyrolysis step with liquid oil aerationally to collect the oil. 
     
     
         5 . A method for recycling waste tires according to  claim 1 , wherein the step of pyrolyzing waste tires further comprises residues of the waste tires that were inserted into the pyrolysis furnace and pyrolyzed being eliminated outside to be pulverized and discharged by residue treatment step. 
     
     
         6 . A method for recycling waste tires according to  claim 1 , wherein the pyrolysis furnace is selectively supplied with a carrier gas through a carrier gas supply device comprising filler elements filled with a carrier gas formed by mixing at least one components of carbon dioxide, nitrogen, methanes, ethanes, propanes, butanes, pentanes, hexanes, ammonia and argons. 
     
     
         7 . A method for recycling waste tires according to  claim 1 , wherein the step of injecting a carrier gas comprises:
 detecting oxygen by an oxygen detector installed in a carrier gas circulation line; and   removing oxygen present in the carrier gas circulation line if oxygen is detected, by approval of a sensing information connected to the oxygen detector.   
     
     
         8 . A method for recycling waste tires according to  claim 7 , wherein the step of removing oxygen uses any one of methods of heating by employing an electric heater generating heat by power supply or a heating element generating heat by being supplied with heat source of the heat exchanger, vacuuming with vacuum pressure on the pyrolysis furnace and the carrier gas circulation line, or pressurizing by supplying the carrier gas to the pyrolysis furnace and the carrier gas circulation line to push internal oxygen outside. 
     
     
         9 . A method for recycling waste tires according to  claim 1 , wherein the pyrolysis step further comprises:
 collecting a noncondensable gas generated in the combustion of waste tires in the pyrolysis furnace and storing the collected gas; and   supplying the collected and stored noncondensable gas to the carrier gas circulation line that is connected to the pyrolysis furnace.   
     
     
         10 . A method for recycling waste tires according to  claim 9 , wherein the step of supplying the noncondensable gas to the carrier gas circulation line further comprises:
 measuring the internal pressure of the carrier gas circulation line;   measuring the temperature inside of the pyrolysis furnace; and   collecting a noncondensable gas flowing in the carrier gas circulation line and storing the collected gas if the pressure in the carrier gas circulation line is 100 mmAq or higher and the temperature in the pyrolysis furnace is 200° C. or higher, or supplying the collected and stored carrier gas in the carrier gas circulation line if the pressure is less than 100 mmAq and the temperature in the pyrolysis furnace is less than 200° C.