RU2306510C1 - Drier with pulsating layer - Google Patents

Abstract

FIELD: drying of dispersed materials; microbiological, food-processing, chemical and other industries.

SUBSTANCE: proposed drier includes moist material feeder, drying chamber, calorifier, fan and used air cleaning system. Drying chamber is provided with pulsator, drying column, upper cover with heating element cassette and exhaust filters, changeable gas distributors and relief valve. Exhaust filters are closed with hermetic hood which has hatches with inspection ports; exhaust filter hood is connected with exhaust ventilation system. Secured to relief valve body by means of quick-detachable clips are units for discharge of dried product; unit for continuous discharge of product from drying chamber has body where rotor with six cells rotates by means of electric motor through reduction gear. Moist material is loaded by vacuum with the aid of hose through loading pipe line. Drying column is provided with water jacket formed by double-pipe heat exchangers. Cylindrical part of drying column is provided with sampler and product temperature sensor mounted in drying zone.

EFFECT: increased productivity.

4 dwg

Description

The invention relates to techniques for drying dispersed materials and can be used in microbiological, food, chemical and other industries.

The closest technical solution to the claimed object is a dryer by.with. USSR No. 553424, F26В 17/10, 1975, containing a wet hopper of a wet material with a screw feeder, a drying chamber, a heater, a fan and an exhaust air purification system (prototype).

The disadvantage of the prototype is the relatively low drying performance of the final product due to the fact that not all dispersed materials can be fluidized by blowing the layer with a stationary gas stream, in particular non-fluidizing materials with high initial humidity, clumping, sticking together. When such materials are purged with a stationary gas stream, stable channels are formed in the layer through which the bulk of the gas passes, and as a result, the material cannot be fluidized, for example, when drying a number of granules.

The technical result is an increase in drying productivity by heat treatment of such materials in plants with a pulsating or intermittent in time gas supply through a layer of material.

This is achieved by the fact that in a pulsating layer dryer containing a drying chamber with a pulsator and a drying column, the fan according to the invention, the drying chamber comprises a top cover with a heating element cassette and exhaust filters, interchangeable gas distributors and an unloading valve, the exhaust filters being closed by an airtight umbrella, which has hatches with viewing windows, and the exhaust filter umbrella is connected to exhaust ventilation, and devices are attached to the body of the discharge valve on quick-detachable clamps unloading of a dry product, a device designed to create continuity and tightness of unloading of a dry product from the drying chamber, consists of a housing in which a six-cell rotor rotates with an electric motor through a gearbox, and the wet product is loaded by vacuum through a hose through a loading pipe, the drying column has a water jacket composed of pipe-in-pipe heat exchangers, and a sampler and a control sensor are installed in the cylindrical part of the drying column in the drying zone The temperature of the product during drying.

In Fig.1 shows a General view of the dryer with a pulsating layer, Fig.2 is a diagram of the drying chamber, Fig.3 is a section aa of Fig.1, Fig.4 is a section bB of Fig.1.

A dryer with a pulsating layer (Fig. 1) consists of a drying chamber 4, a pulsator 6, a service platform 5 and a control panel for measuring instruments 7, as well as auxiliary units that are designed to select the best option for loading a wet product and unloading a dry one: hopper 1 unloading dry product, support frame 2, exhaust device 3.

The drying chamber 4 (FIG. 2) consists of a drying column 24, a top cover 8 with a cartridge 23 of heating elements and exhaust filters 15, replaceable gas distributors 20, and an unloading valve 19. The exhaust filters 15 are closed by an airtight umbrella 9, which has hatches 11 with viewing windows . An umbrella 9 of the exhaust filters 15 is connected to exhaust ventilation. If necessary, a safety membrane can be installed on one of the upper flanges 10 of the umbrella. The necessary devices are attached to the body of the unloading valve 19 on quick-release clamps 14, which provide the best option for unloading the dried product. A device designed to create continuity and tightness of product unloading from the drying chamber consists of a housing in which a six-cell rotor rotates by an electric motor through a gearbox (not shown). The wet product is loaded by vacuum through a hose through the loading pipe 12. The drying column 24 has a water jacket 25. Water for heating the column enters through the nozzle 21 and exits through the nozzle 16, then through the bridge 17 it is supplied to the cartridge 23 of heating elements composed of heat exchangers 18 type “pipe in pipe”. In the cylindrical part of the drying column 24 in the drying zone, a sampler 13 and a sensor 22 for monitoring the temperature of the product during drying are installed.

A dryer with a pulsating layer works as follows.

The wet product is loaded by vacuum through a hose through a loading line 12. The drying column 24 has a water jacket 25. Water for heating the column enters through the nozzle 21 and exits through the nozzle 16, then it is fed through a jumper 17 to a cassette of heating elements composed of type 18 heat exchangers "Pipe in pipe". In the cylindrical part of the drying column 24 in the drying zone, a sampler 13 and a sensor 22 for monitoring the temperature of the product during drying are installed.

If a pulsating gas flow is supplied to the lower part of the material layer by a pulsator 6 with a certain frequency and duty cycle, the channels are destroyed and the particle packing after each gas pulsation changes, which ultimately ensures a good liquefaction and processing of the product. The difference in the properties and production technology of medications that can be dried in installations with a pulsating layer, and the variety of requirements that are imposed by the chemical and chemical-pharmaceutical industry on chemical-pharmaceutical preparations, have identified a number of design features in the designs of industrial designs of dryers with a pulsating layer.

Pulsating layer dryers can be recommended for drying crystalline chemical and pharmaceutical preparations that do not allow the use of drying temperatures above 50 ... 80 ° C, which include all tetracycline antibiotics, kanamycin, terpinghydrate, piperazine adipate and the like, as well as tablet granules masses of these and other drugs that require "soft" (sinusoidal) pulsations to reduce the abrasion of the granules.

Claims (1)

A dryer with a pulsating layer comprising a drying chamber with a pulsator and a drying column, a fan, characterized in that the drying chamber comprises a top cover with a cartridge of heating elements and exhaust filters, replaceable gas distributors and an unloading valve, the exhaust filters being closed by a sealed umbrella that has hatches with inspection windows, and the exhaust filter umbrella is connected to exhaust ventilation, and dry product unloading devices are attached to the body of the discharge valve on quick-release clamps, The device designed to create continuity and tightness of the unloading of the dry product from the drying chamber consists of a housing in which a six-cell rotor rotates with an electric motor through a gearbox, and the wet product is loaded by vacuum through a hose through a loading pipe, the drying column has a water jacket composed of from pipe-to-pipe heat exchangers, and in the cylindrical part of the drying column in the drying zone, a sampler and a sensor for monitoring the temperature of the product in drying process.

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