Patent ID: 9017068
Filing Date: 2015-04-28
Classification: C21B,F23D,F27B

Abstract:
1. A top-firing hot blast stove, comprising: a checker chamber including a blast pipe for receiving supply of hot blast air; and a combustion chamber including a hot-blast pipe and a burner system for supplying hot blast to a blast furnace, the combustion chamber being positioned above the checker chamber, wherein the checker chamber is heated by combustion of mixed gas including fuel gas and combustion air supplied from the burner system to the combustion chamber, and hot blast which is generated while the hot blast air passing through the checker chamber is supplied to the blast furnace through the hot-blast pipe, wherein the burner system includes (i) a burner including a multiple pipe line structure, the multiple pipe line structure including three or more concentrically positioned pipe lines, and (ii) a burner duct communicating with an end face of the burner, the burner duct communicating with the combustion chamber through a burner duct outlet disposed at an opposing end of the burner duct relative to the end face, wherein the three or more concentrically positioned pipe lines carry fuel gas or combustion air, wherein pipe lines of the multiple pipe line structure other than an outermost pipe line include swirling flow generating means therein for generating a swirling flow of the fuel gas or the combustion air flowing inside the pipe lines, wherein the outermost pipe line carries a linear flow of the fuel gas or the combustion air, and wherein a swirling flow of mixed gas is generated by the swirling flow of the fuel gas and the combustion air which have flowed into the burner duct, the swirling flow of mixed gas being surrounded at a periphery by the linear flow of the fuel gas or the combustion air passing from the outermost pipe line.