SU857678A1 - Single-drum rotating kiln - Google Patents

Description

(54) UNDER DRESSING ROTATING OVEN FOR GRINDING

one

The invention relates to construction materials, namely the production of artificial lightweight aggregates for concrete, in particular, devices for burning granulated ash aggregate.

A single drum rotary kiln for burning of expanded clay is known, which includes a drum mounted inside and coaxially with it at the border of raw material preparation and firing zones a separating ring with an orifice area several times smaller than the section of drum 1.

However, the use of a ring installed inside the drum at the boundary of the raw material preparation and roasting zones, in the conditions of pellets roasting and the solid medium, the heat carrier in the direct-flow furnace (when the directions of movement of the pellets and the gas flow coincide) excludes part of the kiln from the roasting process. the ring sharply decreases the heating temperature of the material, as a result of which the heat treatment zone is reduced and the expansion of the granules does not occur.

The closest to the technical essence of the invention is a rotary tubular kiln furnace.

containing mounted coaxially with the drum on its loading and unloading ends of the ring 2.

However, the refractory protrusion (ring) installed in the area of the burner arrangement exists only before the furnace is put into operation, because as a result of preliminary surfacing of the slab melt melt, in the cooling zone of the rotary kiln lining, a conic section of the furnace is formed, and this projection disappears, not an obstacle to further unloading of the burned material (crits).

The purpose of the invention is to reduce energy consumption and improve the operating conditions of the furnace.

Claims (2)

This goal is achieved by the fact that in 5 single-drum kiln pellets containing rings on the loading and unloading ends of the drum, set coaxially with the drum, the ratio of the inner radius of the furnace drum to the radius of the ring inlet at the loading 20 end of the drum and the internal radius of the furnace drum to The radius of the ring outlet at the discharge end is 1.2: 1.4 and 1.4: 1.8, respectively. FIG. 1 shows a single drum rotary kiln, general view; in fig. 2A-A in FIG. 1, in FIG. 3 is a section bb of FIG. 1. The furnace consists of a cylindrical drum 1 located on support rollers (not shown), end rings 2 and 3 mounted on the loading and unloading ends of the drum segment accumulator cavity 4 for a solid heat carrier, a burner 5. The furnace works as follows. By turning on the burner 5, the furnace containing drum 1 and rings 2 and 3 is brought into warm-up mode, while the segment accumulating cavity 4 is filled with solid heat carrier, for example coarse quartz sand. When the required temperature of the solid heat carrier in the furnace reaches 1180-1200 ° C, pellets are loaded into the furnace for heat treatment and swelling. Next, the heat treatment mode is kept constant by controlling the flow of the pellets to the furnace and the fuel to the burner. As part of the solid heat carrier (quartz sand) is lost from in the kiln, it is periodically replenished with fresh sand so that the segment cavity 4 is loaded under the edge of the ring 3 at the discharge end of the drum 1. The dimensions of the rings 2 and 3 are chosen depending on the angle of inclination The ratio of the inner radius of the furnace drum to the radius of the inlet of the ring at the inlet end of the drum and the reduction of the inner radius of the drum of the furnace to the radius of the outlet of the ring on the discharge ring is respectively 1.2: 1.4 and 1.4: 1.8 . The ratios are selected depending on the required duration of heat treatment of the material in the furnace. At ratios below the lower limit, the material is burned up, and above the upper one, the material is observed to loose, i.e., the material leaves the furnace, without having reached the required degree of expansion. Solid heat carrier accumulated in cavity 4 provides the thermal inertia of the pellet firing process, which contributes to obtaining high-quality roasting of pellets discharged from the furnace. At the same time, due to the difference in the specific mass of the expanded granules and the solid coolant, mainly the granules are discharged from the furnace, and the solid coolant remains in the storage cavity of the furnace. Claims One-drum rotary kiln for pellet burning, containing rings on the loading and unloading ends of the drum, mounted coaxially with the drum, characterized in that, in order to reduce energy consumption and improve the operating conditions of the furnace, the ratio of the inner radius of the drum of the furnace to the radius of the ring inlet at the loading end of the drum and the ratio of the inner radius of the furnace drum to the radius of the ring outlet at the discharge end is respectively 1.2: 1.4 and 1.4: 1.8. Sources of information taken into account during the examination 1. USSR author's certificate No. 155432, cl. F27 7/00, 1962. 2. USSR author's certificate number 127668, cl. F27 B 7/20, 1959.