SU826170A1 - Method of drying highly-moistured heat susceptible loose materials - Google Patents

Description

The invention relates to a drying technique. There is a known method of drying loose materials, for example block pomace, consisting in the preliminary grinding of materials (due to their different particle size distribution) in crushers and subsequent drying in drum dryers d j. This method requires a relatively large energy consumption, since grinding and drying occurs in various units. In addition, pre-grinding does not provide crushing to the desired condition, especially of such materials that have a higher initial moisture and are prone to adhesion (for example, block squeezes, etc.). Therefore, re-grinding is required. However, this does not allow to achieve the required condition, and excessive grinding leads to adhesion of particles and clumping. Drying the materials in this way is also a relatively long process and is inefficient, uneconomical, and the quality of the dried material is unsatisfactory. The closest to the present invention is a method of drying high-moisture thermosensitive granular materials, which means that the material being dried is moved stepwise in a vibratory drip layer, blown with a drying agent, and crushed the crumpled material after blowing 23. But this method is not suitable for drying such materials as fruit extracts and other coarse materials with different granulometric composition, and can be successfully used only for drying materials such as vegetable and gourd seeds ur - tomatoes, watermelons, melons, pumpkins, etc.

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The purpose of the invention is to improve the quality of drying of coarsely dispersed materials with different particle size distribution and reduction of energy consumption.

The goal is achieved by grinding the material through at least one step, and between these steps, the material is pressed, and the blowdown is carried out at a speed of 0.50, 3 m / s and a temperature of 10 -100 ° C on each stage with an amplitude of oscillations of 3-6 mm and a frequency of 300-600 rpm. The drawing shows schematically an installation implementing the proposed method.

The installation contains a hopper 1 equipped with a ripper 2 and a dispenser 3, and vibration chambers 4 and 5 with grinding 6 and sprinting 7 rollers. Each chamber 4 and 5 has an eccentric drive 8, common to the gas distribution grid 9 and rollers 6 or 7. At the outlet of the chamber 5, a discharge chute 10 is installed.

The installation works as follows.

Wet material is fed from the hopper 1, equipped with loosened spruce 2 and dispenser 3, into the chamber 4 with a vibratory boiling layer blown with hot air through a perforated gas distribution grill 9.

The partially dried material is then directed alternately to the crushing 6 and pressing 7 rollers installed at the end of chamber 4, which, simultaneously with squeezing and grinding of the material, cause the grating 9 and the chamber 4 from the eccentric drive 8 to change with a certain frequency and amplitude The dried material is then transferred to chamber 5, in which it is subjected to a second processing step. The number and purpose of the rollers installed at the end of the chambers can be changed, and the gap between the rollers can be adjusted in accordance with the requirements of drying tehnolotins. At the request of production after the heat 10, a grinding device can be installed to produce flour.

Example 1. Apple pomace with a wide particle size distribution

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Blown with a drying agent in a vibrocalling layer through a perforated bottom for 5 minutes, after which they are crushed on toothed rollers to 6 mm. Next, the product is fed to re-purging in a vibro-boiling layer with subsequent squeezing on smooth rollers, after which it is again moved to purging in a vibro-boiling layer with grinding to 3 mm, which reduces the gap between the rollers.

Obtained after such processing block pomace met the standard quality.

At the request of the production, the dried block marc can be ground to the size of any size while maintaining the required quality of the product.

Example 2. Extractive quinces with a wide granulometric composition are rinsed with a drying agent in a vibratory boiling layer for 3-4 minutes (first stage), after which they are ground on toothed rollers up to 6 mm. Next, the product is fed to a repeated purging with a drying agent in a vibro-boiling layer (second stage), followed by squeezing on smooth rollers, after which it again goes to the purging in a vibrocooled layer (third stage), followed by grinding to a particle size of the dried product 3 mm.

The obtained quince marches meet the established quality standards.

Example 3 Cut blocks (for example, 5 mm thick circles) are blown with a drying agent in a vibratory cell and dried there for 10 minutes until a crust forms on the surface (1/3 of the total volume of the circle). The product is then compressed on adjacent smooth rolls having an adjustable gap, which is adjusted so that the product does not burst under pressure. After that, the product is sent to re-purge in a vibro-boiling layer and so on step by step in 3 steps.

The cut blocks obtained after drying meet the established quality standards of the finished product. Using the examples of the blowdown of the drying agent in the vibro-kip layer, see the table.

Claims (1)

Claim The method of drying high-moisture thermosensitive bulk. Materials> preferably apple marc, by their stepwise movement in vi- brokipyaschem layer 20 while purging the drying agent and grinding, characterized in that, in order to improve drying of coarse quality materials with different granulometric composition ^r5 metric and reduce power consumption, grinding the material leads, at least one step, and between these steps after blowing with a drying agent the material is compressed, and the blowing is carried out at a speed of 0.5-3.0 m / s and a temperature of 40-200 ° C at each step and with an amplitude of 3-6 mm and a frequency of 300-500 rpm