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This combustion air, after picking up the heat from the checker brick, then enters the furnace through an end-wall above the checker chamber and burns the fuel, which also enters the furnace at the same wall.
Air is blown into the furnace through tuyeres, water-cooled nozzles made of copper and mounted at the top of the hearth close to its junction with the bosh.
Air blown into the furnace through the tuyeres is preheated to a temperature between 900° and 1,350° C (1,650° and 2,450° F) in hot-blast stoves, and in some cases it is enriched with up to 25 percent oxygen.
A sintered or pelletized feed consisting of coke (for fuel), limestone (as a flux for slag making), and iron oxide is charged into the top of the furnace through a double bell or rotating chute, and heated air is blown in through nozzles, or tuyeres, close to the furnace bottom.
Air that has been preheated to temperatures from 900° to 1,250° C (1,650° and 2,300° F), together with injected fuel such as oil or natural gas, is blown into the furnace through multiple tuyeres (nozzles) located around the circumference of the furnace near the top of the hearth; these nozzles may number from 12 to as many as 40 on large furnaces.
The sensor was inserted into the furnace through a steel bushing with water cooling.
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It was also relatively cheap to buy the factory's 52-foot-long blue furnaces, through which rare earth powders move on extremely slow conveyor belts while superheated to 2,800 degrees Fahrenheit.
And heat from a hot-water furnace rises through custom-made wood grills from radiators recessed under the perimeter of the floor.
In the early morning of March 6, a fire started by what the town fire marshal called an improperly installed furnace ripped through the 160-year-old Central Hall block on West Main Street, destroying the building and eight businesses.
In 1998, 66 children and 5 adults at an elementary school in Queens were hospitalized after carbon monoxide and other poisonous gases from a coal furnace drifted through the building.
When we lived in New York, heat escaping from our apartment helped to heat the apartment above ours; nowadays, many of the Btus produced by our brand-new, extremely efficient oil-burning furnace leak through our two-hundred-year-old roof and into the dazzling star-filled winter sky above.
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