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US 4,311,456 AGranted
Blast furnace stove
AssigneeBricmont & Associates, Inc.
InventorStanley J. Kletch
Life of this patent
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AssigneeBricmont & Associates, Inc.
InventorStanley J. Kletch
Estimating the term…
A vertically-fired blast furnace stove includes a mixing bed comprised of a multitude of spheres, cylinders or berl saddles supported by a carrier having openings therein located in the bottom portion of a vertically-extending combustion chamber. The bed extends within the walls of the combustion chamber above the floor to form a chamber coupled to pipes for delivering fuel and air to pass in the inner space openings in the bed where mixing and heating of the fuel and air supplies occurs for combustion above the bed. The hot products of combustion are directed by a dome into a heat-storage chamber having a filling of checkerbrick and then into a flue pipe. A control system operates valves for the air and gas supplies to heat the combustion walls above the ignition temperature after which the supplies of fuel and air are controlled in relation to a pressure difference between the pressure in the combustion chamber above the mixing bed and the supply pressure of at least one of the combustion components comprised of fuel and air. The fuel-to-air ratio is varied to increase the dome temperature to a predetermined maximum and thereafter the combustion products are tempered by increasing the supply of air to maintain the predetermined maximum dome temperature. During this period of control, the checkerbricks in the heat-storage chamber are heated to their desired elevated temperature which is determined by monitoring the temperature of combustion gases delivered to the flue.
A vertically-fired blast furnace stove comprising a vertically-extending combustion chamber having a discharge opening for heated air, heat-storage means to receive the products of combustion from said vertically-extending combustion chamber, air-supply means communicating with said heat-storage means for discharging heated air therefrom to said discharge opening, a mixing bed comprised of a multitude of bodies upon a carrier in the bottom portion of said combustion chamber to mix and heat fuel and air supplies for combustion thereabove before passage of combustion products into said heat-storage means, said bodies being comprised of heat-resistant, high-temperature material, said carrier including a grid with openings capable of passing fuel and air into the bed to undergo heating within the bed while passing along the space between the bodies of the bed, and means including control valves to introduce fuel and air directly without combustion into said mixing bed for rapid combustion thereabove in said combustion chamber.
A method for controlling a blast furnace stove having a vertically-extending combustion chamber with an exhaust opening for discharging heated air, a heat-storage chamber to receive products of combustion from said combustion chamber, a dome to direct products of combustion from the combustion chamber to the heat-storage chamber, means to deliver air to the heat-storage chamber for heating therein and discharge through said exhaust opening, said method including the steps of passing fuel and air through a mixing bed at the bottom portion of the combustion chamber for admixture therein and combustion in the combustion chamber, increasing the supplies of fuel and air with increases to the dome temperature to heat the combustion chamber above the ignition temperature of the fuel and air mixture up to a predetermined minimum temperature, thereafter adjusting the supplies of fuel and air in relation to the difference between the pressure in the combustion chamber above the mixing bed and the supply pressure of at least one combustion component comprised of the fuel and air, varying the fuel-to-air ratio to increase the dome temperature to a predetermined maximum, thereafter tempering the combustion products with an increased supply of air to maintain said predetermined maximum dome temperature, terminating the supplies of fuel and air to said combustion chamber at a predetermined desired temperature of combustion products discharged from the heat-storage chamber, and thereafter heating a blast of air in the heat-storage chamber for delivery by said exhaust opening.
Dependencies are inferred from the claim text.