Ash melting device

Abstract

An ash melting device employing the means of using a crucible with a three-layer structure, using an auxiliary burner for prevention of the lowering of temperature in the vicinity of the discharge outlet, employing furnace walls with a four-layer structure to improve the heat insulating property and thereby improve the durability, providing lids at both the left and right sides to enable the crucible to be taken out readily, etc. This ash melting device is intended to significantly improve durability even after a long period of use at a high temperature of 1600 to 1700° C. or more, to resolve the problem of prevention of use of the melting furnace due to clogging of the vicinity of the discharge outlet by the cooling and solidification of the ash melt, to reduce fuel cost by the improvements in thermal efficiency through improvement of the heat insulating property of the furnace walls, and to enable the crucible to be exchanged readily in a short time.

What is claimed is:  
     
         1 . An ash melting device, which is characterized in that in a furnace, with which a cover equipped with a burner is provided on a main furnace body having a discharge outlet and an ash loading inlet, an exchangeable crucible of a multilayer structure is provided at the innermost layer of said main furnace body and for the melting of the ash, the open part of said crucible is directed towards the side of the lid provided with the burner and the melt is discharged from the discharge outlet by the action of gravity.  
     
     
         2 . An ash melting device as set forth in  claim 1 , wherein a crucible, having a three-layer structure comprised of a first crucible, backup sand, and second crucible, is used as said crucible.  
     
     
         3 . An ash melting device as set forth in  claim 2 , wherein an ultrahigh-temperature durable type crucible, for example, an aluminum titanate, alumina, zirconia, or magnesia type crucible, which can withstand high temperatures of approximately 1700 to 2400° C. or more, is used as the first crucible and a graphite silicon carbide crucible is used as the second crucible.  
     
     
         4 . An ash melting device as set forth in any of claims  1 ,  2 , and  3 , wherein burner  3  is directed diagonally downwards and the burner flame is blown towards the lower bottom of the crucible.  
     
     
         5 . An ash melting device as set forth in claims  1 ,  2 ,  3 , and  4 , wherein an auxiliary burner is provided at the vicinity of the discharge outlet.  
     
     
         6 . An ash melting device as set forth in claims  1 ,  2 ,  3 ,  4 , and  5 , wherein lids are provided at two locations at the left side and the right side.  
     
     
         7 . An ash melting device as set forth in claims  1 ,  2 ,  3 ,  4 ,  5 , and  6 , wherein the ash loading inlet is provided above the main furnace body.  
     
     
         8 . An ash melting device as set forth in claims  1 ,  2 ,  3 ,  4 ,  5 ,  6 , and  7 , wherein a melt leakage sensor is provided in the backup sand disposed between the first crucible and the second crucible.  
     
     
         9 . An ash melting device as set forth in claims  1 ,  2 ,  3 ,  4 ,  5 ,  6 ,  7 , and  8 , wherein the lid and main furnace body are comprised of five layers of a first heat resistant layer, first heat insulating layer, second heat resistant layer, second heat insulating layer, and iron shell.