Melting equipment

Abstract

The melting equipment has a melting furnace that combusts and melts ash, a secondary combustion chamber disposed above the melting furnace, a slag extraction chute that guides slag generated in the melting furnace downward, a bypass channel ( 20 ) that connects the slag extraction chute and the secondary combustion chamber, an ejector ( 22 ) that is provided between the bypass channel ( 20 ), has a contraction portion ( 23 ) at which the channel cross sections are narrowed, and suctions the combustion exhaust gas (G) into the bypass channel ( 20 ), and an adhesion-prevention unit ( 31 ) ( 41 ) that prevent an incorporated substance that incorporates into the combustion exhaust gas (G) from attaching to the inner wall surface ( 21 a ) of the ejector ( 22 ).

1 . A melting equipment comprising:
 a melting furnace that combusts and melts an ash;   a secondary combustion chamber disposed above the melting furnace;   a slag extraction chute that guides a slag generated in the melting furnace downward;   a bypass channel that connects the slag extraction chute and the secondary combustion chamber;   an ejector that is provided on the bypass channel, has a contraction portion at which a channel cross section thereof is narrowed, and suctions a combustion exhaust gas into the bypass channel; and   an adhesion-prevention unit that prevents an incorporated substance that is incorporated in the combustion exhaust gas from attaching to an inner wall surface of the ejector.   
     
     
         2 . The melting equipment according to  claim 1 , wherein
 the adhesion-prevention unit has an adhered substance removal portion that removes an adhered substance that is attached to the inner wall surface of the ejector.   
     
     
         3 . The melting equipment according to  claim 2 , wherein
 the adhered substance removal portion supplies vibration to the inner wall surface of the ejector.   
     
     
         4 . The melting equipment according to  claim 2 , wherein
 the adhered substance removal portion blows an air to the inner wall surface of the ejector.   
     
     
         5 . The melting equipment according to  claim 2 , wherein
 the adhered substance removal portion performs mechanical washing on the inner wall surface of the ejector.   
     
     
         6 . The melting equipment according to  claim 1 , wherein
 the adhesion-prevention unit has a swirling separation portion that is provided at an upstream of the contraction portion, swirls the introduced combustion exhaust gas so as to form a swirling flow, and centrifugally separates an incorporated substance included in the swirling flow.   
     
     
         7 . The melting equipment according to  claim 6 , wherein
 the swirling separation portion has a cooling system that cools the inner wall along which the swirling flow of the combustion exhaust gas flows.   
     
     
         8 . The melting equipment according to  claim 6 , wherein
 a plurality of the ejectors is provided in a row.   
     
     
         9 . The melting equipment according to  claim 1 , wherein
 the adhesion-prevention unit has an air film forming portion that forms an air film along the inner wall surface of the ejector.   
     
     
         10 . The melting equipment according to  claim 1 , wherein:
 the adhesion-prevention unit includes a plurality of replaceable branching channels that is provided at the bypass channel, and branches on the upstream side and joins with the downstream side; and   each of the plurality of the branching channels has an ejector.   
     
     
         11 . The melting equipment according to  claim 1 , wherein:
 the adhesion-prevention unit includes a liquid dispersion portion that is provided upstream of the ejector, and disperses liquid in the combustion exhaust gas so as to remove the incorporated substance included in the combustion exhaust gas; and   the driving air in the ejector has a temperature that is equal to or higher than the temperature at which the dispersed liquid gasifies.