초록 ▼

Disclosed is an improved high velocity dual fuel burner and a method for firing a vertical shaft metal melting furnace with gaseous or liquid fuel in which the burner nozzle is adapted to mix and ignite both types of fuels alternately or in combination by means of three concentric nozzles including

Disclosed is an improved high velocity dual fuel burner and a method for firing a vertical shaft metal melting furnace with gaseous or liquid fuel in which the burner nozzle is adapted to mix and ignite both types of fuels alternately or in combination by means of three concentric nozzles including a central oil spraying nozzle, an intermediate nozzle to supply natural gas and an outermost nozzle to supply combustion air.

대표청구항 ▼

An improved method of operating a vertical shaft metal melting furnace of the type having a multiplicity of high velocity dual fuel burners located near the bottom of, and communicating with the interior of said furnace through a refractory combustion chamber, said burners adapted to be fired with a

An improved method of operating a vertical shaft metal melting furnace of the type having a multiplicity of high velocity dual fuel burners located near the bottom of, and communicating with the interior of said furnace through a refractory combustion chamber, said burners adapted to be fired with a fuel selected from the group consisting of gaseous and liquid fuel and combinations thereof in order to melt pieces of copper by injecting heat resulting from combusting said fuel and air in said combustion chamber communicating with said furnace, wherein the improvement comprises the steps of; introducing copper pieces to be melted into the top of said shaft furnace; premixing natural gas fuel with air; flowing a first stream of gaseous fuel to said burner; supplying an additional amount of air, necessary to combust said gaseous fuel, to said burner; injecting the streams of premixed gas and air and additional air in a substantially uniform pattern into said combustion chamber; mixing, igniting, and burning said first stream of gaseous fuel and said air to supply heat to said combustion chamber then injecting said heat into said furnace; after heating said combustion chamber, then flowing a liquid fuel oil to said burner; increasing the flow of air to said burner to the amount necessary to combust said liquid fuel; maintaining at least a continuous pilot flame in the combustion chamber by burning some gaseous fuel while reducing the flow of said gaseous fuel to the burner; mixing and burning said liquid fuel and said air in the presence of said pilot flame to supply heat into said furnace; continuously directing the hot products of combustion toward said pieces of copper to melt said copper; and continuously discharging molten copper from the bottom of said shaft furnace without contaminating the molten copper with uncombusted liquid fuel oil.