SU877271A1 - Unit for drying food vegetable materials in compacted bed unit for drying dispersed materials - Google Patents

Description

(54) SETTING FOR DRYING DISPERSED

I

The invention relates to a technique for drying dispersed materials in a suspended layer and can be used in the chemical, metallurgical, food and other industrial sectors.

A known drying unit for dispersed materials comprising a fluidized bed chamber in series with a gas distribution valve, a pneumatic tube and a separator. On the one hand, the fluidized bed chamber is equipped with a charging device, and on the other hand it communicates with a pneumatic tube, made in conjunction with an ejector section equipped with an adjustable diffuser L

A disadvantage of the known installation is the increased energy consumption for drying the material, which is associated with heat loss from the material, gases escaping through the walls of the dryer to the environment. In addition, the installation costs high electrical materials

2

energy associated with the movement of material.

The purpose of the invention is to reduce sHespro costs.

The goal is achieved by the fact that the installation additionally contains a circulation fluid circuit, which includes a pump, a heat exchanger

10 high pressure, daossel and vacuums. Ny condenser with drain pipe connected to the separator; the pneumatic tube is equipped with a screw-in jacket, the upper part of which is connected to the discharge side of the pump, and the lower part to the high-pressure cushion exchanger; the fluidized bed chamber is equipped with a pallet installed under the gas distributor and included in

Claims (1)

20 circuit after throttling, and the condenser drain pan and drain pipe are connected to the suction side of the pump .., In the drawing, a schematic representation of a plant for drying dispersed materials. The installation includes a sump (evaporator 1 1, boiling bed chamber 2, chamber jacket 3, gas distributor 4, charging device 5, hopper 6, pneumatic tube 7 equipped with a shirt 8 inside which a screw insert 9 is mounted, high pressure heat exchanger 10, throttle 11 , condensate drain 12, pipeline 13, drain pipe 14, circulation circuit pump 15, separator 16, discharge device 17, vacuum condenser 19 inlet pipe 18, liquid barometric column 20, sump well 21, cooling circuit pump 22, liquid injector 23and connecting pipes 24. The installation for discharging dispersed materials works as follows: The material from the hopper 6 is fed by the charging device 5 into the chamber 2 to the gas distributor 4, where it is fluidized. The fluidized bed of material is formed by passing 4 vapor through the gas distributor 4 passing from the pallet 1 to the pneumatic pipe 7. Under the action of vapors, the particles of the material are carried away into the pneumatic tube 7. Chamber 1 and pneumatic tube 7 are equipped with jackets 3 and 8 in which the water supplied to them by the pump 15 circulates. Circulation The circuit is closed through the heat exchanger 10 and the choke 11 connected to the tray 1. The circuit feed is carried out by the pump 15, which is also connected to the drain pipe 14 of the vacuum condenser 19. The screw insert 9 contributes to an increase in the heat removal from the pneumatic tube 7. The main driver of the material movement is the drop pressure arising between chamber 2 and vacuum condenser 19, in which a vacuum is formed during vapor condensation and maintained by a liquid ejector 23. Depending on the degree of heating of the material entering into the chamber 2, and the amount of heat absorbed from the pneumatic tube 7 by the circulating fluid, in the heat exchanger 10, the fluid is heated or cooled to such an extent that, after passing through the choke 1, it ensures the release of steam in the tray 1 in the amount of necessary for fluidizing the material in chamber 2 and transporting it in pneumatic tube 7. Excess liquid not evaporated in pan 1 is sucked by pump 15, after which it is mixed with make-up water. The vapor coming from the subgroup 1 to the gas distributor 4 and the heated material layer is superheated. Further steam overheating can occur in the pneumatic tube 7 both through further contact with the material and through the friction of the material against the walls of the pneumatic tube 7. At the same time, heat is transferred from the gas flow through the wall of the pneumatic tube 7 to the circulating fluid. Due to the supply and removal of heat to the gas flow along the length of the pneumatic tube 7, the flow is accelerated, and the kinetic energy of the steam is expended in moving the material. As the pressure decreases, residual moisture evaporates from the material particles. Moisture evaporation is an internal source of heat dissipation. Thus, the acceleration of the gas suspension flow occurs due to the pressure drop, physical material heat, friction, heat transfer through the pneumatic tube 7 and evaporation of residual moisture. At the same time, the material in the pneumatic tube 7 is cooled. This mode of operation of the installation provides a reduction in energy consumption for drying dispersed materials. Claims for drying dispersed materials comprising successively connected fluidized bed chamber with gas distributor, pneumatic tube and separator, in order to reduce energy consumption, it additionally contains a circulation liquid circuit in which a pump and high pressure heat exchanger are connected choke and a vacuum condenser with a drain pipe connected to the separator; the pneumatic tube is equipped with a jacket with a screw insert, the upper part of which is connected to the discharge side of the scoop, and the lower part - to the high-pressure heat exchanger; the fluidized bed chamber is equipped with a pallet installed under the gas distributor and included 587727 6 in the contour after drossel, and under-. Sources of information, the don and the drain pipe the condenser taken into account during the examination are connected to the suction side of the bottom 1. USSR USSR Certificate of Rec. F 26 B 17/10, 1975. f: V.:;rl:y:/:V L. . . ..     H - . L at