SU1270513A1 - Method of drying electrodes and portable drier for effecting same - Google Patents

Abstract

1. A method of drying electrodes by means of convective-radiative heating in water-intensive stirring layers, characterized in that, in order to improve the quality of drying, heating is carried out in two stages, in the first of which the radiation flux is directed from top to bottom layer of electrodes. the second, and a second stream of radiation is directed from the bottom to the top layer of the upper rus electrodes under conditions of natural convection of the surrounding air. 2. A portable dryer for electrodes, comprising a housing with a lid, electric heaters and grid shelves placed inside it, characterized in that, in order to improve the quality of drying, the housing has a connector along a horizontal plane, and its parts are hinged together, and in each of them the electric heater is fixed on the pivot racks and is equipped with a screen at the bottom, and the shelf is located above the electric heater. (L

Description

The invention relates to heat engineering, mainly to the processes of drying products, and can be used in mechanical engineering and construction.

The purpose of the invention is to improve the quality of drying.

Fig. 1 shows schematically a portable dryer for electrodes in an opened working state, a transverse section; figure 2 is the same, top view; FIG. 3 shows a dryer assembled for carrying.

The portable dryer for electrodes contains a housing 1 with heaters embedded in it, with power units 2 in the form of electric heaters 3 and trellis shelves 4. Case 1 is made in the form of symmetrical hollow boxes 5, opened 180 ° on both sides. The power unit 2 of the electric heaters 3 is equipped with a grid shelf 4 on top and a screen 6 at the bottom, while in the working position} the power unit is mounted on pivot posts 7 fixed by spring-loaded hooks 8 in a vertical position, and on one of the pairs of struts 7 the power unit 2 is rotatable and removal. On the basis of the racks 7 a shelf is fixed in the form of a sheet 9, and on the box 5 - a lid 10.

The dryer works as follows.

From the storage mode, the box 5 of the housing 1 is opened on both sides by 180 °, while lifting the block 2 is fixed on racks 7 and 7, which are held in vertical position by latches 8. Rotating the block 2 to the upper position opens access to the cavity of the boxes 5 and one or two rows of wet electrodes are placed on sheet 9, after which block 2 is lowered onto rack 7. On grid 4, an e, e group of electrodes is also placed in one or two rows. The same operations are carried out with the second half of the dryer. The dryer is activated by connecting tubular electric heaters 3, the mode of operation of which is controlled by a control unit (not shown). In operation, electric heaters 3 maintain a predetermined temperature, wherein the heating and drying of the lower row electrodes are effected by radiation directed downward and attenuated by screen 6 twice, and full radiation upwards is transmitted to electrodes located on the grid shelf 4. Moreover, The screen 6 has access to heater 3 and is surrounded by its air, which, due to natural convection, washes the upper row of electrodes, increasing the intensity of drying in its second period. The bottom row of electrodes is also an additional screen protecting the dryer body 1 from overheating.

and reduce heat loss. When the electrodes are consumed from the upper row, the electrodes of the lower row move to the grid 4, and a new batch of electrodes is placed on sheet 9. When the need for electrodes is reduced, unit 2 is taken out of one half of the dryer and dry hot electrodes are placed in its place, covered by the cover 10 for storage. Thus, the dryer can also serve as a storage case for dry electrodes. An example. A portable dryer of sizes 550X450X120 mm weighing 8.5 kg with 3 kW power units built into each of its halves is loaded with electrodes with a total weight of up to 40 kg (4 times and 10 kg each). With an initial humidity of 2% electrodes, the duration of their drying is 1.3-1.5 hours at each of the loading positions, and at a temperature of electric heaters of 700 ° C, the flow of energy to each of the positions is distributed as follows: energy loss to the environment is 0.6- 0.7 kW heat per convective part of flow up to 1 kW; for radiation drying and heating in the lower range of up to 1.5 kW; for radiation drying of the upper p

electrodes up to 3 kW, i.e. double flow. In steady state, the actual capacity of the dryer is up to 30 kg / h.

Example 2. A portable dryer of reduced size and weight (up to 6 kg with 1.5 kW power units embedded in each of its halves is loaded with electrodes with a total mass of 25 kg and a humidity of 2.3%. At a heater temperature of 800 ° C, the flows are distributed as follows

way: energy loss up to 0.5 kW; convective drying to 0.8 kW; drying lower p yes 0.6 kW; dosushka to 1.2 kW. The capacity of the dryer is 15 kg / h with a total drying time in each

positions up to 2 hours

Portability of cyanum is determined by decreasing its mass. However, limiting the reduction of its mass leads to a certain decrease in its efficiency, since

it is necessary to increase their heating temperature, and this leads to a relative increase in energy losses. Nevertheless, the quality of drying of the electrodes remains high, since the heating and drying of the electrodes by a weakened radiation flux.

in an environment with high air humidity in the lower row, it is possible to eliminate excessive internal voltages arising in the coating of the electrodes when they are heated.

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Claims (2)

1. The method of drying the electrodes by convective-radiative heating in belt-staged layers, characterized in that, in order to improve the quality of drying, heating is carried out in two stages, in the first of which the radiation flux is directed from above onto the layer of electrodes of the lower tier, and to the second one - the double flux of radiation is directed from below to the layer of electrodes of the upper tier under conditions of natural convection of the surrounding air. 2. A portable dryer for electrodes, comprising a housing with a lid, electric heaters and grid shelves placed inside it, characterized in that, in order to improve the quality of drying, the housing has a connector along a horizontal plane, and its parts are hinged together, and in each of them the electric heater is fixed on the pivot racks and is equipped with a screen at the bottom, and the shelf is located above the electric heater. 9 FIG. / 1270513 1270513 2