Plastic liquefying device

Abstract

A plastic liquefying device, includes a gasifying furnace ( 19 ) for generating pyrolytic gas by heating and melting plastic waste and a liquefying tank ( 2 ) for liquefying and separating the pyrolytic gas generated in the gasifying furnace ( 19 ). The gasifying furnace ( 19 ) further comprising a heating device ( 22 ) for heating the inside of an oven-shaped furnace body ( 20 ) provided at the bottom of the furnace body ( 20 ) having a plastic waste inlet (H) provided at the top thereof and an opening and closing mechanism ( 21 ) for opening and closing the inlet (H) installed at the inlet (H). The opening and closing mechanism ( 21 ) further includes a plate shutter ( 24 ) larger than at least the opening area of the inlet (H) and a fixing device ( 25 ) for pressingly fixing the shutter ( 24 ) to the seal surface (S) around the peripheral edge part of the inlet (H). Since the inside of the furnace body ( 20 ) can be sealed by closely fitting the shutter ( 24 ) to the seal surface (S), the lowering of a pressure inside the furnace due to gas leakage and the deterioration of an ambient environment can be prevented.

What is claimed is:  
     
         1 . A plastic liquefying device comprising a gasifying furnace for generating pyrolytic gas by melting plastic wastes; and a liquefying tank for liquefying and separating the pyrolytic gas generated at the gasifying furnace, wherein the gasifying furnace comprises: 
 heating means located at a bottom of an oven-shaped body of the furnace for heating an inside of the furnace, an oven-shaped body of the furnace having a plastic waste inlet at an upper part thereof; and    an opening and closing mechanism located at the inlet for opening and closing the inlet,    wherein the opening and closing mechanism comprises: 
 a plate shutter at least larger than an aperture area of the inlet; and  
 locking means for securing the shutter onto a sealing surface of the inlet peripheral edge by way of pressure.  
   
     
     
         2 . A plastic liquefying device of  claim 1 , wherein sliding means for opening and closing the inlet by horizontally sliding the shutter is provided at the shutter.  
     
     
         3 . A plastic liquefying device of  claim 1 , wherein the sliding means is a hydraulic cylinder with one end connected to the shutter and the other end pivotably connected to the furnace body.  
     
     
         4 . A plastic liquefying device of  claim 1 , wherein the locking means is a hydraulic cylinder which secures the shutter onto the sealing surface by way of pressure from above.  
     
     
         5 . A plastic liquefying device of  claim 1 , wherein a purge gas header which sprays purge gas onto the sealing surface is provided at the peripheral edge of the inlet.  
     
     
         6 . A plastic liquefying device of  claim 1 , wherein a corrugated surface which is formed by a plurality of canaliculate members placed parallel to each other is provided at a bottom of the furnace body.  
     
     
         7 . A plastic liquefying device of  claim 6 , wherein a canaliculate-shape discharge pipe is provided such that the discharge pipe merges with ends of the canaliculate member, and a screw conveyer is provided in each of the canaliculate members and the discharge pipe.  
     
     
         8 . A plastic liquefying device of  claim 1 , wherein the heating means comprises a gas burner, a jacket which covers a perimeter of the furnace body to flow exhaust combustion gas from the gas burner, and a parting strip which is arranged spirally at the jacket.  
     
     
         9 . A plastic liquefying device comprising a gasifying furnace for generating pyrolytic gas by melting plastic wastes and a liquefying tank for liquefying and separating the pyrolytic gas generated at the gasifying furnace, wherein the gasifying furnace comprises: 
 a vertical tube body for receiving infectious plastic wastes,    heating means for heating the vertical tube body from its surrounding and generating pyrolytic gas by pyrolitically decomposing infectious plastic wastes, and    an agitator to agitate an inside of the furnace body, wherein the top part of the furnace comprises: 
 an inlet to receive the infectious plastic wastes, an opening and closing lid for opening and closing the inlet,  
 a gas outlet for exhausting the pyrolytic gas, and  
 the gas outlet includes an automatic opening and closing valve.  
   
     
     
         10 . A plastic liquefying device of  claim 9 , wherein the furnace body is a pressure vessel, the furnace body has a vertical tube shape metal sack body, the hemispheric end covers are provided at both top and bottom parts thereof, and an opening and closing lid and the gas outlet are further provided at the top part.  
     
     
         11 . A plastic liquefying device of  claim 9 , wherein the agitator comprises a drive shaft which is positioned at a shaft center part of the furnace body, a driving motor for rotating the drive shaft, and a plurality of moving vanes which radially extend from the drive shaft, and the moving vanes respectively revolve in contact with the bottom of the furnace.  
     
     
         12 . A plastic liquefying device of  claim 9 , wherein a discharge opening for discharging insolubles is provided at the bottom part of the furnace body.  
     
     
         13 . A plastic liquefying device comprising a gasifying furnace for heating various kinds of plastic wastes and generating pyrolytic gas and a liquefying tank for condensing the pyrolytic gas generated at the gasifying furnace and then separating, wherein the bottom part of the gasifying furnace narrows in a valley-shape and includes a screw conveyer and an outlet for discharging insolubles.  
     
     
         14 . A plastic liquefying device of  claim 13 , wherein the liquefying tank includes a jet scrubber for spraying a cooling water onto the pyrolytic gas to condense the pyrolytic gas, and a cleaning column for cleaning exhaust gas in a landscape water tank, the bottom part of the water tank narrows in a funnel-shape and is connected to a drain line, and a middle part of the water tank is connected to an oil recovery line.  
     
     
         15 . A plastic liquefying device of  claim 14 , wherein a neutralization tank for infusing neutralizer is provided at the drain line.