SU922464A1 - Suspended layer dryer - Google Patents

Description

(5) DRIED WEIGHT DRYER

I

The invention relates to a technique for drying solutions, suspensions, and lumping materials in a suspended layer of inert bodies, for example, fluoroplastic granules, and can be applied in the chemical, pharmaceutical and food industries.

A known chamber for drying pastes and suspensions in a suspended layer of inert bodies, contains a conical drying chamber, a grate over which the stirrer is installed in the form of a spherical bowl with a perforated bottom, equipped with propeller blades, branch pipes for removal of the spent heat carrier and the dried product, fitted with baffle nets for retention of inert bodies, and a pipe for the supply of coolant.

However, this chamber has the following disadvantages, the possibility of clogging the space between the grate and the cup-shaped stirrer with dried matter sticking to inert bodies.

sticking of the openings of the baffle grilles before removing the spent coolant, excessive grinding of the inert bodies when they hit the edge of the agitator blades, which have the highest speed.

Closest to the proposed technical entity is a weighted layer dryer, comprising a housing with a loading point at the top.

to the part and the diaphragm in the lower part, under which there is a supply box for the heat carrier, mounted on the shaft a stirrer in the form of a disk carrying the blades, and an adjusting valve,

15 overlapping aperture I2

Claims (2)

However, this dryer is characterized by weak mechanical mixing of inert particles even at high speeds of the agitator, insufficient drying uniformity, improvement with increasing speed of the heat carrier mixing inert particles, but deterioration of the drying process, due to heat 3. by an intense flow of coolant from the surface of inert bodies of undried material and its entrainment. . The purpose of the invention is the intensification of heat and mass transfer. The goal is achieved by additionally installing a funnel and a conical bumper coaxially with the shaft above the agitator, and the agitator is equipped with a second disk located above the first and having a funnel underneath the funnel, and additionally a cyclone drying chamber with tangential introduction of the heat carrier from an autonomous source. FIG. 1 shows schematically the proposed dryer; in fig. 2, section A-A in FIG. 1, in FIG. 3 section bb in fig..1. The dryer includes a housing 1, in which a shaft 2 is mounted on bearings 3. A cylindrical box k with a tangential pipe 5 for the bottom of the primary heat carrier is installed in the lower part of the housing. The box k is closed by a diaphragm 6, above which the case has a conical firm, which passes into the sphere in the upper part. The exit from the sphere is limited by a conical baffle 7 to which the funnel 8 is attached. The main working element is a turbine-type agitator, consisting of a main disk 9 and an additional disk 10 with a center outboard 11. The blades 12 of the agitators are strengthened between disks 9 and 10 . The mixer is mounted on the shaft 2 above the diaphragm 6. On the shaft 2 between the diaphragm 6 and the stirrer a check valve 13 is installed. , a limiting flange 17, a casing 18 and a tangential nozzle 19 connected to an autonomous source (not shown). Along the axis of the cyclone chamber lA of the final dryer, a pipe 20 of a loading unit is installed to introduce the material to be dried. The dryer works as follows. Rotation of the shaft 2 with the help of a stirrer creates an oriented wash-over of inert bodies. Inert bodies from the funnel 8 of it fall into the central opening 11 of the disk 10. The blades 12 of the particles are accelerated and are thrown out of the mixer. At the same time, the mixer circulates the coolant with its rise in the form of an annular layer along the wall of the conical part of the body, where intensive mixing with inert bodies takes place. The total flow of particles and the coolant expands, rising upward along the wall of the conical part of the body, then passes into the upper spherical part of the body, in which the direction of flow changes smoothly to the axis of the body-. The particles then hit the conical baffle 7 and enter the funnel 8. The spent heat carrier entrains a part of the dried material in the form of fine powder, which is formed during the drying process and is rubbed on the surface of inert bodies. The obtained powder is dried in a cyclone chamber. And when additional coolant is supplied through tangential nozzle 19 with its subsequent twisting. In tangential nozzles 16. The gas mixture of dry powder and exhaust coolant is sucked out of the upper part of the cyclone chamber H along a tangential outlet and sent to a cyclone discharge and then into the dust collection system (not shown) .. 3 the moment the dryer is turned on, the valve 13 mounted on the shaft 2 of the agitator drops down and closes the opening of the diaphragm 6, and Including the possibility of ingestion of inert bodies or dried material into the box. The proposed dryer allows to significantly intensify the drying process and improve the quality of the dried material. The possibility is excluded (; coarse material even at the minimum consumption of the primary coolant. The circulation intensity of the closed flow of inert bodies depends on the rotation speed of the agitator, and the amount of heat transfer fluid can be varied over a wide range depending on the desired particle size of the dried product. The final drying is carried out a cyclone chamber having an autonomous input of a heat carrier, which makes it possible to set the necessary operating parameters (flow rate and temperature of the heat carrier) Regardless of the operating parameters of the bottom suit of the dryer. At the end, this also improves the quality of drying of thermolabile materials. 1. Weighted layer dryer comprising a housing with a loading unit at the top and a diaphragm at the bottom, under which the supply box for the heat carrier is located. mounted on the shaft of the stirrer in the form of a disk carrying the blade, and an adjusting valve blocking the opening of the diaphragm, characterized in that, in order to intensify heat and mass transfer, in the housing above the mixer, coaxially with the shaft is additionally fitted with a funnel and a conical bump, and the agitator is equipped with a second disc located above the first one and having a central opening under the funnel base. 2. Dryer according to Clause Г, about tl and h and y with the fact that in the case above the bumper a cyclone pre-drying chamber with tangential input of the heat carrier from an autonomous source is additionally placed. Sources of information taken into account in the examination 1. USSR author's certificate number, cl. F 26 B17 / 10, 1978. 2. USSR author's certificate №, cl. F 26 B 17/10, 1969. S Ф «г.2 6-5