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furnace |
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furnace, enclosed space for the burning of fuel. There are many kinds of furnaces, the type depending upon the fuel and the use to which the heat produced within it is put. Most familiar are the furnaces used in the heating of buildings. In the hot-air furnace, fuel is burned within an inner wall and air, led into a space between the inner and the outer wall, is heated and is led away to the various rooms of the building. Hot-water furnaces, by which water is heated to be led through pipes to radiators, and furnaces that turn water to steam for heating purposes are common. The kiln kiln (kĭl, kĭln), furnace for firing pottery and enamels, for making brick, charcoal, lime, and cement, for roasting ores, and for ..... Click the link for more information. is a kind of furnace. In metallurgy, the separation of many metals from their ores is accomplished by the use of various kinds of furnaces, e.g., the blast furnace blast furnace, structure used chiefly in smelting . The principle involved in this means of extracting metals is that of the reduction of the ores by the action of carbon monoxide, i.e., the removal of oxygen from the metal oxide in order to obtain the metal. ..... Click the link for more information. and the reverberatory furnace. The structure of these furnaces makes possible a good control of temperature. In the production of steel steel, alloy of iron, carbon, and small proportions of other elements. Iron contains impurities in the form of silicon, phosphorus, sulfur, and manganese; steelmaking involves the removal of these impurities, known as slag, and the addition of desirable alloying ..... Click the link for more information. , however, the open-hearth furnace and the Bessemer converter are used in the treatment of cast iron. The electric furnace is extensively employed in the production of high-grade steels for use in making steel alloys and for the manufacture of high-speed tools. Heat may be generated in such a furnace by using an electric arc or by sending an electric current through resistive elements in the furnace. If the material to be processed is electrically conductive, heat may also be generated by creating an electric current in the material by induction or by inserting into it electrodes to which a voltage is applied. In the preparation of phosphorus from calcium phosphate, this compound of phosphorus is mixed with sand and coke and treated in an electric furnace. An electric current is sent from one electrode to another through the mass to create the extremely high temperature needed to bring about the chemical action that results in the production of free phosphorus. Graphite is produced from coal or coke in an electric furnace, and the extremely hard substance carborundum is made there by the combination of carbon and silicon (from sand). Nitrogen is obtained from the air (in the Birkeland-Eyde process) by passing a stream of air through an arc. The nitrogen and oxygen of the air combine to form nitric oxide. furnace an enclosed chamber in which heat is produced to generate steam, destroy refuse, smelt or refine ores, etc. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Finally I won, and was permitted to go to the school in the day for a few months, with the understanding that I was to rise early in the morning and work in the furnace till nine o'clock, and return immediately after school closed in the afternoon for at least two more hours of work. Across the desolate plain, stripped bare of all vegetation, and made hideous forever by the growth of a mighty industry, where the furnace fires reddened the sky, and only the unbroken line of ceaseless lights showed where town dwindled into village and suburbs led back again into town. Grandfather loved a wood-fire far better than a grate of glowing anthracite, or than the dull heat of an invisible furnace, which seems to think that it has done its duty in merely warming the house. |
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