RU2303220C1 - Apparatus for drying the polymeric materials - Google Patents

Abstract

FIELD: microbiological industry; food processing industry; chemical industry; other industries; apparatuses for drying the disperse materials.

SUBSTANCE: the invention is pertaining to the apparatuses for drying the disperse materials and may be used in microbiological industry, food processing industry, chemical industry and other industries. The apparatus for the drying the polymeric materials contains the loading hopper of the wet material with the screw feeder, the drying chamber with the support lattice, the burner with the mixing chamber, the turbo-gas blower and the system of the spent air purification. Under the support lattice of the apparatus there is the acoustic generator, which transforms the energy of the compressed air into the acoustic energy with the frequencies of the acoustic waves laying in the range of frequencies from 15 up to 16 kHz with the sound intensity from 2 up to 3 W/s at the treatment duration from 2 up to 5 minutes, and the dry product discharge is made through the fitting pipe located directly above the lattice on the side opposite to the loading of the wet material. At that the spent dusty gases are exposed to the preliminary acoustic treatment in the acoustic installation, which optimal parameters for the sound treatment of the mean-dispersive dust are the level of the sound pressure of 140 dB and more, the frequency of the vibrating motion of 900 Hz, the dust concentration in the airflow of no less than 2 g/m³, the duration of the sounding of 1.5 - 2 s, after that the gas stream is routed into the cyclone, where the main part of the dry material is separated, and the final purification of the gases is exercised in the hose filter, in the exhaust tract of which there is the mounted recycling valve switching the stream to the inlet of the mixing chamber of the burner. The technical result of the invention is the increased productivity of the drying process.

EFFECT: the invention ensures the increased productivity of the drying process.

3 cl, 1 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 loading hopper of wet material with a screw feeder, a drying chamber with a support grid, a furnace with a mixing chamber, a gas turbine and an exhaust air purification system (prototype).

The disadvantage of the prototype is the relatively low productivity of drying the final product.

The technical result is an increase in drying performance.

This is achieved by the fact that in the installation for drying polymer materials containing a wet hopper with a screw feeder, a drying chamber with a support grill, a furnace with a mixing chamber, a gas turbine and an exhaust air purification system, a sound emitter 13 is installed under the support lattice of the drying chamber, which converts the energy of compressed air into acoustic energy with the frequency of acoustic waves lying in the optimal frequency range from 15 to 16 kHz with a sound intensity of 2 to 3 W / s, with processing time from 2 to 5 minutes, and the dried product is unloaded through a nozzle located directly above the grate, on the side opposite to the loading of wet material, and the dusty exhaust gases are subjected to preliminary acoustic treatment in an acoustic installation, the optimal parameters of which for sound processing of fine dust are : sound pressure level 140 dB or more, vibrational frequency 900 Hz, dust concentration in the air stream at least 2 g / m ³ , time oz learning 1.5 ... 2 s, after which the gas stream is sent to the cyclone with the hopper, where the main part of the dry material carried away by the gases is released, and the final cleaning of the gases takes place in a bag filter, in the exhaust tract of which a recirculation valve is installed, which switches the exhaust flow and purified air at the inlet of the mixing chamber of the furnace.

The drawing shows a diagram of an installation for drying polymer materials.

The installation for drying polymer materials contains a hopper 1 of wet material with a screw (or other design) feeder 2. The wet material is continuously fed into the drying chamber 3 in a layer of "boiling" material.

The flue gases mixed with the air from the furnace 4 with the mixing chamber 11 are fed by means of a turbo-gas blower or fan (not shown) to the support grid of the drying chamber 3, in the bottom of which a sound emitter 13 is installed. Compressed air under pressure 3 ... 3, 5 kGf / cm ² is supplied to the pipeline (not shown) of the sound emitter 13, which converts the energy of compressed air into acoustic energy. The frequency of the acoustic waves of the sound emitter 13 lies in the optimal frequency range from 15 to 16 kHz with a sound intensity of 2 to 3 W / s, while the duration of the processing of the sound emitter is in the time interval from 2 to 5 minutes.

Unloading of the dried product is carried out through the pipe 5, located directly above the grate, on the side opposite to the loading of wet material.

Exhaust dusty gases are subjected to preliminary acoustic treatment in an acoustic installation 12 for collecting dust. The optimal parameters for sound processing of medium-sized dust are: sound pressure level of 140 dB or more, vibrational frequency of 900 Hz, dust concentration in the air stream of at least 2 g / m ³ , scoring time 1.5 ... 2 s. Then the gas stream is directed to cyclone 6 with hopper 7, where the bulk of the dry material carried away by the gases is released, and the final purification of the gases takes place in the bag filter 8. In the exhaust path of the bag filter 8, a recirculation valve 9 is installed, which is ordered by the microprocessor (not shown shown), which controls the drying optimization process depending on the parameters of the processed material, can switch the flow of exhaust and purified air 10 to the inlet of the mixing chamber 11 of the furnace 4. The microprocessor is connected nen with pressure sensors, temperature, humidity, air velocity and fluidized streams (not shown) installed in the drying elements of the circuit, and actuating bodies (not shown) governing the parameters of all elements of the drying circuit. The microprocessor analyzes the parameters of the drying process and sets the optimal mode by applying control signals to the actuators of the drying circuit elements.

Installation for drying polymer materials works as follows.

Wet material from the feed hopper 1 with a screw (or other design) feeder 2 is continuously fed into the drying chamber 3 into a layer of "boiling" material.

The flue gases mixed with the air from the furnace 4 with the mixing chamber 11 are fed by means of a turbo-gas blower or fan (not shown) to the support grid of the drying chamber 3, in the bottom of which a sound emitter 13 is installed. Compressed air under pressure 3 ... 3, 5 kGf / cm ² is supplied to the pipeline (not shown) of the sound emitter 13, which converts the energy of compressed air into acoustic energy. The frequency of the acoustic waves of the sound emitter 13 lies in the optimal frequency range from 15 to 16 kHz with a sound intensity of 2 to 3 W / s, while the duration of the processing of the sound emitter is in the time interval from 2 to 5 minutes.

Unloading of the dried product is carried out through the pipe 5, located directly above the grate, on the side opposite to the loading of wet material. Exhaust dusty gases are subjected to preliminary acoustic treatment in an acoustic installation 12 for collecting dust. The optimal parameters for sound processing of medium-sized dust are: sound pressure level of 140 dB or more, vibrational frequency of 900 Hz, dust concentration in the air stream of at least 2 g / m ³ , scoring time 1.5 ... 2 s. Then the gas stream is directed to cyclone 6 with hopper 7, where the bulk of the dry material carried away by the gases is released, and the final purification of the gases takes place in the bag filter 8. In the exhaust path of the bag filter 8, a recirculation valve 9 is installed, which is ordered by the microprocessor (not shown shown), which controls the drying optimization process depending on the parameters of the processed material, can switch the flow of exhaust and purified air to the input of the mixing chamber 11 of the furnace 4. The microprocessor is connected It is connected with pressure, temperature, humidity, air and fluidized flow sensors (not shown in the drawing) installed in the elements of the drying circuit, and with executive bodies (not shown in the drawing) that regulate the parameters of all elements of the drying circuit. The microprocessor analyzes the parameters of the drying process and sets the optimal mode by applying control signals to the actuators of the drying circuit elements.

The installation works with low layers of material (300 ... 400 mm), while providing large moisture removal (up to 2000 kg of moisture from 1 m ^{2 of a} grate per hour) and therefore is widely used in large-tonnage productions. So, for example, a dryer with a diameter of 4.3 m, designed for drying coal, with an initial moisture content of 10% has a capacity of 350 t / h.

The installation for drying polymer materials is intended for drying lime materials (limestone, dolomite, shell scrap, cement marl), as well as for coal, calcium and magnesium carbonates and polymeric materials (polyethylene, polypropylene, polyvinyl chloride).

Claims (2)

1. Installation for drying polymer materials, comprising a wet hopper of a wet material with a screw feeder, a drying chamber with a support grill, a furnace with a mixing chamber, a turbo-gas blower and an exhaust air purification system, characterized in that a sound emitter 13 is installed under the support grill of the drying chamber, which converts the energy of compressed air into acoustic energy with the frequency of acoustic waves lying in the optimal frequency range from 15 to 16 kHz with a sound intensity of 2 to 3 W / s for a duration processing from 2 to 5 minutes, and the dried product is unloaded through a pipe located directly above the grate from the side opposite to the loading of wet material, and the exhaust dusty gases are subjected to preliminary acoustic treatment in an acoustic installation, the optimum parameters for sound processing of fine dust are the sound level pressure 140 dB or more, vibrational frequency 900 Hz, dust concentration in the air stream at least 2 g / m ³ , dubbing time I am 1.5-2 s, after which the gas stream is sent to the cyclone with the hopper, where the main part of the dry material carried away by the gases is released, and the final cleaning of the gases takes place in a bag filter, in the exhaust tract of which a recirculation valve is installed, which switches the flow of waste and cleaned air to the inlet of the mixing chamber of the furnace. 2. Installation for drying polymer materials according to claim 1, characterized in that a microprocessor is introduced into the circuit, which is connected to pressure, temperature, humidity, air and fluidized flow sensors installed in the elements of the drying circuit, and with actuators that control the parameters all elements of the drying circuit, which analyzes the parameters of the drying process and sets the optimal mode by means of control signals acting on the actuators of the drying circuit elements.