Patent ID: 8080200
Filing Date: 2011-12-20
Classification: C21B,C21C,F23D,F23L,F27D,Y02E,Y02P

Abstract:
1. A pulverized coal injection lance for feeding pulverized coal into a tuyere of a blast furnace, said lance comprising: a cylindrical outer pipe for conveying combustive gas, and a cylindrical inner pipe, coaxially arranged within said outer pipe, for conveying pulverized coal, said inner pipe forming a separation wall for separating said pulverized coal from said combustive gas, said separation wall being at least partially discontinued in a region near said front end of said lance, thereby forming a mixing region within said pulverized coal injection lance for allowing pulverized coal and combustive gas to come into contact within said pulverized coal injection lance near said front end wherein said outer pipe and said inner pipe have substantially the same length and wherein said inner pipe comprises at least one lateral opening near said front end of said lance for allowing pulverized coal and combustive gas to come into contact within said pulverized coal injection lance near said front end.