SU907365A1 - Fluidised-bed dryer - Google Patents

Description

(54) DRYING FOR BOILER LAYER

one

The invention relates to heat engineering, in particular to devices for heat treatment of polydisperse granular materials in a fluidized bed, for example for drying and cooling molding sand, and can be used in the engineering and chemical industries, in the building materials industry and in a number of other areas households

At present, fluidized bed dryers with multi-colored separation chambers are becoming more common for the heat treatment of polydisperse granular materials.

A well-known semidirectional furnace of the fluidized bed, containing a double-light working chamber equipped with power flows, with gas distribution grids 1 located in each floor.

However, the furnace does not cool the material.

Also known is a kiln for firing fine material in a fluidized bed, containing a three-meter working chamber with

gas distribution grids and overflow chutes 2.

The disadvantage of the furnace is its large size.

Closest to the proposed technical essence is a fluidized bed dryer containing interconnected essential and cooling chambers connected to collectors of coolant and cold air, respectively, Q and both chambers are equipped with gas distribution devices 3.

However, the insufficient use of the cooling agent in this dryer leads to an increase in energy consumption.

The purpose of the invention is to reduce energy consumption.

In order to achieve this goal, the cooling chamber is made of a horseshoe-shaped, enclosing the existing chamber on three sides, and the cold air collector 20 is made in the form of a box that repeats the shape of the cooling chamber and also covers it on a part of the perimeter.

Claims (3)

FIG. 1 shows schematically the proposed dryer; in fig. 2 shows section A-A in FIG. one; in fig. 3 - gas distribution pipe of the cooling chamber box, section. The fluidized bed dryer contains drying 1 and cooling 2 chambers. In the chamber there is an unallocated gas distribution grid 3, which divides it into sub-grid part 4 (collector for heat carrier) and separation part 5 with branch pipe 6 for removal of spent heat carrier. In the upper part, the separation part 5 of the chamber 1 is also provided with a feeder 7 with a cone distributor 8 of wet material. The cooling chamber 2 is made of a horseshoe-shaped rectangular (or trapezoidal) cross-section, enclosing the chamber 1 on three sides, and connected to a cold air collector 9, made in the form of a box separated by an inclined partition 10 from the chamber 2 and repeating its shape. The collector 9 is equipped with a pipe 11 for supplying a cooling agent and gas distribution pipes 12 installed inside the chamber 2 along its perimeter. The cooling chamber 2 is connected to the separation part 5 of the chamber 1 by the overflow 13 and is equipped with a discharge chute 14. The fluidized bed dryer also contains a combustion device 15 with a burner 16. The spent agent is removed from the chamber 2 to the separation 5 of the chamber 1 via the overflow 17. Offered The operation works as follows. The wet material is fed by a feeder 7 with a cone distributor 8 into the separation part 5 of the chamber 1, where it is subjected to heat treatment in a fluidized bed with a hot coolant coming from the furnace 15. The dried material through the flow 13 is poured from chamber 1 into the cooling chamber 2 forms where it is intensively cooled in the fluidized bed by a cooling agent entering through gas distribution pipes 12. The cooled material is discharged through the discharge chute 14. The spent agent comes from chambers 2 into the drying chamber 1 through the flow 17, and then together with the exhaust coolant into the atmosphere through the pipe 6. The cooling chamber 2 has a horseshoe shape, covering the existing chamber 1 from three sides, and the presence of gas distribution pipes 12 in the chamber 2 located along its perimeter , contributes to reducing energy consumption for process management due to the elongation of the path of the cooled material and more complete use of the cooling agent. Claims of the fluidized bed containing connected between the drying and cooling chambers connected to the collectors of the coolant and cold air, respectively, both of which are equipped with gas distribution devices, characterized in that, in order to reduce energy costs, the cooling chamber is made of a horseshoe shape, three sides covering the drying chamber, and the cold air collector is made in the form of a box that repeats the shape of the cooling chamber and also covers it in part perimeter. Sources of information taken into account in the examination 1. Klushchin D. P. and others. The boiling layer in non-ferrous metallurgy. M., “Metallurgists, 1978, p. 119-122. 2. USSR author's certificate number 469037, cl. F 26 B 17/10, 1971. 3. Romanov P.G. and others. Drying in a suspended state. L. “Himi, 1968, p. 89, fig. 11 - 19.