SU823786A1 - Plant for drying loose materials - Google Patents

Description

The invention relates to devices for drying bulk materials and can be used in black, color, and machine-building enterprises. teline indices for the preparation of refractory, for example, quartzitic ramming masses. A known device for drying loose materials, containing pipes heated by industrial frequency, for moving material from top to bottom, made in the form of spirals. Installation disadvantage - low heating efficiency and high specific heat consumption. Closest to the present invention is a plant for drying bulk materials, comprising a heat insulating jacket, a receiving container and a system of vertical pipes heated by industrial frequency currents. In this case, the casing is made in the form of a box with a perforated lid and bottom, which is installed inside the receiving container 2. The loose flux is loaded into the casing, filling the pipes and the space between them. Tubes are heated with currents of industrial frequency. Effective heating of the material as a result of a rather large heat transfer surface and insignificant heat loss contributes to its intensive drying. Unloading is done by lifting the box. The dried material is poured into the container through the holes in the bottom of the box. The known installations cannot be widely used for drying, for example, finely ground quartzite powders for induction furnaces containing 25-40% of the dust-like fraction, since the unloading process is accompanied by a considerable dust emission of silica-resistant quartzite. In addition, the pouring during unloading is accompanied by intensive diffraction of the material, leading to a deterioration in the quality of the ramming mass according to the grain composition. Due to the need for sufficient strength and abrasion resistance, the casing is a cumbersome and relatively heavy structure. The purpose of the present invention is to reduce the dust formation and the fractionation of the dried material.

This goal is achieved by the fact that the pipes are placed directly on the container installed under the heat-insulating casing, the container being filled in the form of a hopper with a discharge device, and the heat-insulating casing in the form of a cap.

The design described provides loading. Of the drying material directly into the receiving container. Carrying out the drying process in it, excluding the unloading process and the accompanying intensive dusting and diffraction, allows to mechanize the unloading of the container into the mixing unit.

The elimination of the loading of the casing and the contact of the abrasive material with its walls makes it possible to use more efficient fibrous materials for thermal insulation and to significantly reduce the weight of the installation.

FIG. 1 shows schematically the described installation; in fig. 2 - installation with a container made in the form of a bunker with a discharge device.

The installation contains a heat insulation casing in the form of a cap 1 with a perforated upper part, on which the loading hopper 2 and pipes 3 are fixed, connected in series and heated with industrial frequency currents. The pipes form a gap with the walls and the bottom of the receiving container 4. The receiving container 4 is installed under the heat insulating cap 1 on the heat insulating plate 5.

In the installation example shown in FIG. 2, the container 4 is made in the form of a bunker and is mounted with a possibility of fastening on the supporting frame 6. A discharge device 7 is fixed in the lower part of the container 4.

The installation works as follows.

Bulk, wetted material, such as finely ground quartzite, is loaded into hopper 2 and, through the perforated upper part of the heat insulating cap 1, pass through. fills the volume of the receiving container 4, penetrates into the pipes 3 and the space between them.

After loading the container, a power frequency current is connected to the series-connected pipes 3 and heats them. When this occurs, the effective heating of the material and intensive evaporation of water.

The drying mode is controlled by the emax3M temperature on the pipes 3 and at the points farthest from them. The optimal heating temperature for pipes 3 is 300-400 ° C. When reaching the points farthest from the pipes 3, points 1X 105-115 ° C, the current is turned off and drying stops.

After the end of the Suji process, the heat insulating cap 1 with hopper 2 and pipes 3 rises. At the same time, there is no transfer of dried material. The tubes 3 are removed from the finely ground powder with minimal dust emission and diffraction. The heat insulating cap 1 prevents the spread of dust generated during the extraction of pipes 3.

The container 4 with the dried material is sent to the warehouse, and the next empty container is installed on the heat insulating plate 5. Next, the cap 1 with the hopper 2 and the pipes 3 is lowered and installed to form gaps between the pipes 3 and the container 4. After installing the hood 1 with the pipes 3, the next loading of the container 4 with a wet material is carried out, and the cycle is repeated. When making the container 4 with the discharge device 7, the operation is performed as follows. The container 4 is mounted on the support frame. The C c is fixed, for example, by means of bolts or wedges. Next, a heat insulating casing with a loading hopper 2 and pipes 3 is installed. In this case, the pipes 3 are placed directly in the container 4 and form gaps with its walls.

After the assembly is assembled, the tare 4 is loaded with ground quartzite, a power frequency connection to pipes 3, a drying process is performed, the current is turned off, and a casing with a hopper 2 and pipes 3 is lifted.

Further, the container 4 is removed from the supporting frame 6 and shipped to load the mixer. A backup empty container is installed on the support frame 6 and the cycle is repeated.

The proposed installation contributes to the improvement of sanitary and hygienic working conditions and stabilization of the grain composition of the material being dried. The use of containers with a unloading device reduces labor costs in the preparation of the filling mass and the manufacture of lining induction channel furnaces.

In addition, the introduction of the installation for the mass production of dry quartzite powders for induction furnaces will increase the production of the drying redistribution, reduce the specific conditional fuel consumption by 10–16 times, significantly reduce the costs of loading and unloading and transportation costs, refuse to adhere to refractory steel for Container Manufacturing.

Claims (3)

1. Installation for drying bulk materials, mainly ground quartzite, containing a heat insulation casing, a receiving container and a system Vertical pipes heated by industrial frequency currents, characterized in that, in order to reduce dust generation and diffraction of the material being dried, the pipes are placed directly in the container installed under the heat insulating casing. 2. Installation according to claim 1, characterized in that the packaging is made in the form of a bunker with a discharge device. 3. Installation on PP. 1 and 2, that is, the case is made in the form of a cap. Sources of information taken into account in the examination 1. USSR author's certificate number 276809, cl. F 26 B 17/12, 1969. 2. The certificate of the USSR 538202, cl. F 26 B 9/06, 1975. 0 /one