SU86796A1 - Installation for drying pulverized or fine-grained fuel by solid heat carrier - Google Patents

Description

The use of solid heat transfer fluid, as well as the selection and use of juice vapor are known in the drying technique and are widely used in practice.

The proposed plant for drying pulverized or fine-grained fuel with a solid heat carrier differs from the known ones in that, in order to preheat the fuel before drying, a heat exchanger is used, through which the spent heat carrier in mixture with the fuel to be dried passes.

The drawing shows the installation diagram.

Cold coolant from the hopper 16 is continuously fed through the valve / 7 into the loading box 18 and the heating shaft furnace 19, heated by flue gases from the furnace 20.

The hot coolant is continuously discharged from the furnace 19 by means of a tray discharger 6 and is supplied in the prescribed amount to the drying shaft 9. Here, the corresponding amount of preheated fuel is supplied by the metering vane feeder 2. Flowing along the guiding surfaces of the drying shaft, the mixture is collected in the lower part of the shaft 9, from where a tray unloader / discharger is fed to the screen 7.

The dried fuel is collected under a screen in a bunker 13, from which it is then supplied to the consumer via a conveyor 14 fed by a paddle unloader 22.

The heat carrier, having the dimensions of a piece of 25 mm and freed from the thunder of impurities from the fuel, is transferred into a mixing bunker 5, where simultaneously cold raw fuel is fed from the bunker 24 with a paddle unloader 23. From the hopper 3, the mixture is fed by an elevator 4 to the heat exchanger 5, which is a vertical shaft with inclined shelves for more intensive mixing of the mixture from the cold