Device and method for cooling fume intakes

Abstract

A cooling device for fume intakes for exhausted gases from foundry furnaces comprises a flue pipe for extracting the fumes produced in premises containing a source of fumes, a cooling system consisting of a tube made of steel lined in appropriate areas of its surface and length and wound in a spiral. In the tube there circulates cooling water with a temperature of the water at entry and in operation kept constantly between 50 and 120° C., with a temperature variation between the inlet and the outlet of the tube in a range of 10-30° C. The lining of the tube may be made of special martensitic stainless steel, or of glassy alloy, or of Ni/Cr cermet.

1 . A cooling device for fume intakes comprising a tube bundle in which a coolant flows, and means for maintaining the coolant in the range between 50 and 120° C. and for maintaining the temperature variation of the coolant in said nest of tubes between 10 and 30° C., and in which said tube bundle is provided with a lining in appropriate areas of its surface and length.  
     
     
         2 . A device according to any of    claim 1   , wherein the coolant is kept at said temperature also in periods of charging and tapping.  
     
     
         3 . A device according to    claim 2   , wherein the temperature of the water at said inlet of the tube is between 50 and 100° C.  
     
     
         4 . A device according to    claim 3   , wherein means are provided for regulating the rate of circulation of the water in said tube according to the initial temperature of the water itself and to the variation of said temperature inside said tube.  
     
     
         5 . A device according to    claim 5   , wherein said tube is lined with martensitic stainless steels.  
     
     
         6 . A device according to    claim 5   , wherein said tube is lined with a metallic-glass lining.  
     
     
         7 . A device according to    claim 5   , wherein said tube is lined in Ni/Cr cermet with chromium carbides and/or tungsten carbides, and/or titanium carbides and their combinations.  
     
     
         8 . A method for cooling fume intakes by means of a cooling device, in particular for exhausted fumes from foundry furnaces, comprising the following steps: 
 a) input of water in a bundle of tubes of the cooling device at a predetermined temperature in the range between 50 and 120° C.; and    b) circulation of the water at a predetermined rate and pressure, according to the temperature of entry of the water itself, its output temperature and the temperature of the fumes, so that the variation in temperature of the water between said tube inlet and said tube outlet is remains within a predefined range.    
     
     
         9 . A process according to    claim 8   , wherein said predefined temperature range at which the water in the tube is maintained is between 10 and 30° C.