SU533805A1 - Rotating drum furnace - Google Patents

Description

The invention relates to equipment for the production of building materials, in particular, rotary kilns for firing cement raw mix, and can be applied in other parts of the national economy during the heat treatment of materials of this kind. Known rotating multi-drum clipping furnaces for the klipker are known, which include preparation, active, decarbonization and gas-thermal reactions, as well as chutes for feeding the raw meal 1. Known furnaces have advantages from the point of view of better organization of heat transfer and stability of operation over conventional single-tube furnaces the fact that the loading devices are structurally either complex and require a synchronization mechanism for threading, for example, alternately with each of the tubes, or these devices They represent a common overflow tube for all pipes, similar to one-tube furnaces, and equipped with lifting blades. / Such a device in hearth-tube furnaces does not provide a uniform supply of sludge into the pipes, does not exclude its overflow through the retaining plate in case of overflow of the overflow chamber. By its technical essence, the one closest to the present is a furnace, having preparation zones made of longitudinal drums, essences, decarbonisation and exothermic reactions 2. However, with all its design and technological advantages, this furnace also has a number of disadvantages: for its nutrition with raw mixture There should be synchronous, automatically operating systems, the development of which in itself is not promising. In order to eliminate these drawbacks in the proposed furnace, pipes in the preparatory zone are provided with a distribution chamber connected to the feed chute, and through overflow holes made in the pipes, to the working space of each of the pipes. FIG. Figure 1 shows a side view rotary kiln described; in fig. 2 is a section along A-A in FIG. one; in fig. 3 is a section along B - B in FIG. 1 (heat exchanger formers are shown); in fig. 4 shows a section along B-B in FIG. 1. The furnace contains made of longitudinal, for example, four pipes (drums) 1, preparation zone 2, zone of ins 3, decarbonization 4 and exothermic reactions 5, as well as

sintering zone 6 and chute 7 for feeding the raw material mixture (sludge).

There is a distribution chamber 8 between the pipes 1 and connected to the loading chute 7; through the bypass holes 9, the chamber is connected to each of the pipes 1.

In the preparation area, a ladle heat exchanger is placed 10.

The distribution chamber is formed by the surfaces of the AND pipes 1 in the zone of the bypass holes, the retaining washer 12 and the end step 13.

During operation of the furnace, the sludge is fed through the chute 7 into the distribution chamber 8 and through the holes 9 it enters the preparation zone 2.

Next, the sludge is transported by the buckets of the heat exchanger 10, forming in each pipe a curtain of jets of overflowing sludge, which intensifies the heat exchange and reduces dust removal.

In the drying zone 3, peresyping blades 14 are installed, playing also the role of screens, preventing them from radiating heat from the high-temperature part to the preparatory zones.

The subsequent heat treatment of the material in the decarbonization zones, exothermic reactions is similar to that in conventional rotary kilns.

The proposed furnace design can be used in the reconstruction of large-diameter furnaces (4X150, 4.5X170, 5X X185m), for which the required number of pipes forming the process zones up to the sintering zone are mounted in a single-tube casing.

This makes it possible to stabilize the power supply of the furnaces, to increase their hourly productivity, to reduce the dust emission.

Formula and 3 about b e and e and

A rotary drum furnace for heat treatment of cement raw material mixture containing circumferentially parallel pipes forming preparation, drying, decarbonization and exothermic reactions, and a loading chute, characterized in that, in order to stabilize the nutrition of the nec and reduce the dustiness, pipes in the preparatory zone are made of a distribution chamber connected to the loading chute and through overflow holes made in the pipes to the working space of each of the pipes.

Sources of information taken into account in the examination:

1 French Patent No. 712805, 2, 1931. 2. Auth. St. Yao 503109, F 27B 7/02, 1972.

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