Method and arrangement for treating process gas flowing from a pyrometallurgical furnace into a waste heat boiler

Abstract

Provided are a method and an arrangement for treating process gas flowing from a furnace space of a pyrometallurgical furnace into a waste heat boiler that is in fluid communication with the furnace space of the pyrometallurgical furnace at a connecting aperture. The method comprises providing the region of the connecting aperture between the furnace space of the pyrometallurgical furnace and the waste heat boiler with a gas blowing means for blowing gas into process gas flowing from the furnace space of the pyrometallurgical furnace into the waste heat boiler, and blowing gas with the gas blowing means into process gas flowing from the furnace space of the pyrometallurgical furnace into the waste heat boiler.

1 - 18 . (canceled) 
     
     
         19 . A method for treating process gas flowing from a furnace space of a pyrometallurgical furnace into a waste heat boiler that is in fluid communication with the furnace space of the pyrometallurgical furnace at a connecting aperture,
 comprising   a providing step for providing the region of the connecting aperture between the furnace space of the pyrometallurgical furnace and the waste heat boiler with a gas blowing means for blowing gas into process gas flowing from the furnace space of the pyrometallurgical furnace into the waste heat boiler,   a blowing step for blowing gas with the gas blowing means into process gas flowing from the furnace space of the pyrometallurgical furnace into the waste heat boiler,   providing the gas blowing means in a lower region of the connecting aperture in the providing step,   blowing by means of the gas blowing means provided in the lower region of the connecting aperture gas into the process gas from below into process gas flowing from the furnace space of the pyrometallurgical furnace into the waste heat boiler in the blowing step, and   blowing in the blowing step gas with the gas blowing means from below into process gas flowing from the furnace space of the pyrometallurgical furnace into the waste heat boiler in the connecting aperture between the furnace space of the pyrometallurgical furnace and the waste heat boiler.   
     
     
         20 . The method according to  claim 19 , further comprising using as gas at least one of air, nitrogen-enriched air, oxygen-enriched air and inert gas such as nitrogen or argon in the blowing step. 
     
     
         21 . The method according to  claim 19 , further comprising
 providing in the providing step a gas blowing means having an elongate configuration and provided with several gas discharge openings along the elongated configuration, and   arranging the gas blowing means to extend in the transverse direction of the flow of process gas flowing from the furnace space of the pyrometallurgical furnace into the waste heat boiler in the providing step.   
     
     
         22 . The method according to  claim 19 , wherein the pyrometallurgical furnace that is used in the method is any one of the following: a suspension smelting furnace such as a flash smelting furnace or a flash converting furnace, a top submerged lance furnace, and an electrical furnace. 
     
     
         23 . The method according to  claim 19 , wherein providing in the providing step a gas blowing means at least partly in the connecting aperture between the furnace space of the pyrometallurgical furnace and the waste heat boiler. 
     
     
         24 . The method according to  claim 19 , wherein blowing in the blowing step gas with the gas blowing means into the connecting aperture between the furnace space of the pyrometallurgical furnace and the waste heat boiler. 
     
     
         25 . The method according to  claim 19 , wherein blowing in the blowing step gas with the gas blowing means into process gas flowing from the furnace space of the pyrometallurgical furnace into the waste heat boiler in the connecting aperture between the furnace space of the pyrometallurgical furnace and the waste heat boiler. 
     
     
         26 . An arrangement for treating process gas flowing from a furnace space of a pyrometallurgical furnace into a waste heat boiler that is in fluid communication with the furnace space of the pyrometallurgical furnace at a connecting aperture,
 wherein the arrangement comprises the pyrometallurgical furnace having the furnace space, the waste heat boiler, and the connecting aperture between the pyrometallurgical furnace and the waste heat boiler, and wherein   the region of the connecting aperture between the furnace space of the pyrometallurgical furnace and the waste heat boiler is provided with a gas blowing means for blowing gas into process gas flowing from the furnace space of the pyrometallurgical furnace into the waste heat boiler,   the gas blowing means is provided in a lower region of the connecting aperture,   the gas blowing means provided in a lower region of the connecting aperture is configured for blowing gas into the process gas from below into process gas flowing from the furnace space of the pyrometallurgical furnace into the waste heat boiler, and   the gas blowing means is configured to blow gas from below into process gas flowing from the furnace space of the pyrometallurgical furnace into the waste heat boiler in the connecting aperture between the furnace space of the pyrometallurgical furnace and the waste heat boiler.   
     
     
         27 . The arrangement according to  claim 26 , wherein the gas blowing means is configured for blowing at least one of air, nitrogen-enriched air, oxygen-enriched air and inert gas such as nitrogen or argon. 
     
     
         28 . The arrangement according to  claim 26 , wherein
 the gas blowing means has an elongate configuration and being provided with several gas discharge openings along the elongated configuration, and   the gas blowing means extends in the transverse direction of the flow of process gas flowing from the furnace space of the pyrometallurgical furnace into the waste heat boiler.   
     
     
         29 . The arrangement according to  claim 26 , wherein the pyrometallurgical furnace is any one of the following: a suspension smelting furnace such as a flash smelting furnace or a flash converting furnace, a top submerged lance furnace, and an electrical furnace. 
     
     
         30 . The arrangement according to  claim 26 , wherein the gas blowing means is provided at least partly in the connecting aperture between the furnace space of the pyrometallurgical furnace and the waste heat boiler. 
     
     
         31 . The arrangement according to  claim 26 , wherein the gas blowing means is configured to blow gas into the connecting aperture between the furnace space of the pyrometallurgical furnace and the waste heat boiler. 
     
     
         32 . The arrangement according to  claim 26 , wherein the gas blowing means is configured to blow gas into process gas flowing from the furnace space of the pyrometallurgical furnace into the waste heat boiler in the connecting aperture between the furnace space of the pyrometallurgical furnace and the waste heat boiler.