Rotary Furnace

rotary furnace

[′rōd·ə·rē ′fər·nəs]
(mechanical engineering)
A heat-treating furnace of circular construction which rotates the workpiece around the axis of the furnace during heat treatment; workpieces are transported through the furnace along a circular path.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Rotary Furnace


(also tube furnace or drum furnace), a cylindrical industrial furnace that rotates about its longitudinal axis; it is designed for the heating of loose materials for physicochemical processing. Rotary furnaces are classified according to their heat-exchange method as having opposing or parallel flow of gases and materials and according to their method of energy transfer, as having direct, indirect (through the wall of the muffle), or combined heating of the material being processed. According to function, they are classified as rotary furnaces for roasting blends in the manufacture of alumina; for the production of cement clinker; for oxidizing, reduction, and chlorination roasting; for the calcination of aluminum hydroxide, coke, carbonates, sulfates, and other compounds; for dewatering materials; for the extraction of zinc and lead (rotary kilns); for the production of iron or alloys of nonferrous metals by their direct reduction from solid-phase ores (puddling furnaces); and for the roasting of refractory ore raw materials.

The main types of rotary furnace are those in which pulverized, solid, liquid, or gaseous fuel is burned directly in the working section of the furnace, and the heating gases flow toward the material to be processed. The metal drum, which is lined with refractory brick, is mounted at a slight angle to the horizontal on the supporting rollers. In some cases, the diameter of the drum varies along its length. The drum is rotated (1-2 rpm) by an electric motor through a reduction gear and an unshielded toothed transmission. The blend is loaded through a port at the head. Dry blends are loaded by mechanical feeders, but blends in the form of pulp are poured in or injected through nozzles. The fuel (10-30 percent of the mass of the charge) is injected through burners (nozzles) located in the heating cap. This is also the point from which the processed material is unloaded for cooling. The gases from the rotary furnace are cleaned of dust (sublimates). Various heat-exchange devices—rabbles, racks, mesh screens, and nozzles—are used to improve heat transfer. In a number of cases, the furnace lining is made in a special way (for example, cellular) for the same purpose. The basic dimensions of rotary furnaces vary widely: the length from 50 to 230 m, and the diameter from 3 to 7.5 m. The output of a rotary furnace may be as much as 150 tons per hour (processed product). There is a trend toward combining rotary furnaces with various heat-exchange equipment, thereby making it possible to increase the efficiency and economy of the furnaces while reducing their size.


Diomidovskii, D. A. Metallurgicheskie pechi tsvetnoi metallurgii. Moscow, 1961.
Vrashchaiushchiesia pechi dlia spekaniia glinozemnykh shikht, issues 1-2. Moscow, 1962-64.
Khodorov, E. I. Pechi tsementnoi promyshlennosti. Leningrad, 1968.


Rotary Furnace


an industrial furnace through which the items being heated are transported on a rotating disk sole.

Rotary furnaces are used in mass production to heat smallmetal billets before forging. The rotary furnace is similar indesign to the ring furnace and differs only in the shape of therotating sole and the working space. Articles are loaded and discharged through a single window, usually by hand. The outerdiameter of the rotary furnace is up to 5 m. The output is up to5 tons per hour. The furnace is heated by gas or liquid-fuelburners at the furnace wall.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Another study involved a rotary furnace gas-fired non-ferrous melting furnace, 8 ft (2.4m) diameter by 20 ft.
During the operation of a cement rotary furnace 1 the solids (clinker dust) via a gap 11 between the rotating furnace and the refrigerating compartment 4 under the gas pressure comes into the inner space of a daisy type sealing device daisy type 5 and there from are poured into a conical hopper 3 and then come to the damper 7 which is pressed under the action of a loaded threaded lever 8 to the abutment 9, when the mass of discharged solid particles forms a discharge moment with a flap, which is more than a load moment, the flap turns and the discharged mass of solids enters the conduit 6 and then into the chamber 13.
Alusalt's aim is to develop an advanced flue gas transfer system that will take the heat and pressure of the flue gas from the rotary furnace and reuse it to evaporate the water by using a single stage forced circulation evaporator.
In this paper is developed the model of using these gases for the purpose of heating in rotary furnace. Working model can be used in expansion of general model for rationalization of energy use in electric furnaces process for obtaining ferronickel.
The samples were fired in a rotary furnace at temperature ranging from 1050 to 1150 Cdeg to achieve maximum bloating.
"We put in some secret chemicals, and heat the parts in a rotary furnace for two to six hours in a very controlled heat process," he said, as Doug walked me through the process.
The scheme would provide buildings to accommodate a 15-tonne capacity gas-fired tilting rotary furnace, an environmental protection system, offices and parking on a brownfield site to the north of the Alcan buildings.
Can Eng's Basketless Heat Treating System utilizes one rotary hearth furnace for solution treatment, one rotary furnace for aging and a small quench system that does not require large pits in the facility floor.