According to the American Iron and Steel Institute, the purpose of a blast furnace is to produce enough heat to extract iron from raw ore. Iron ore, coke and limestone are placed into a blast furnace and then heated until liquid iron can be separated from the ore.
Once the blast furnace is heated, there are several chemical reactions that take place. The coke is used to produce carbon monoxide, which is a reducing agent used to extract the molten iron from solid ore. The limestone serves as a fluxing agent that bonds with impurities to produce slag, which is then removed before the liquid iron is poured.Learn More
The on-and-off cycling of your furnace depends on many factors, including proper system sizing, thermostat settings and weather conditions. Cycles that are too close together may indicate an oversized system.Full Answer >
Troubleshooting a furnace that does not turn off begins with examining it for a malfunction or clog. The thermostat, air filter and fuel supply can all be examined in less than an hour. If the error cannot be identified during these steps, contact your manufacturer and have a certified technician examine the furnace.Full Answer >
A furnace fan that does not shut off may cause harm to the entire heating system in the home. A couple of simple steps can help check to see if repairs can be completed at home or if professional help is required. Resetting the thermostat, clearing any clogs and replacing the filter if worn or damaged are all easy fixes for basic problems. If these do not help, it is best to get a professional opinion./
According to HowStuffWorks, the thermocouple in a gas furnace uses two dissimilar metals that produce an electric current when heated in order to power an electromagnet that opens a valve allowing gas to reach the furnace. If the pilot light goes out, the thermocouple cools and no longer produces the current, so the electromagnet releases the valve to stop the gas flow.Full Answer >