SU1386825A1 - Method of spray drying of thermally-sensitive materials - Google Patents

Abstract

The invention relates to methods for drying liquid products, synthetic detergents and m. used in the chemical industry. The purpose of the invention is to increase the quality when drying detergents with their subsequent cooling. For this purpose, the additional flow is introduced at two levels 9, 10. At the top level 9, the agent is directed downwards at an angle of 12-18 ° & to the horizontal plane; at the lower level 10 — along the ascending line at an angle of 45–70 to the horizontal plane. This creates a vortex flow of cooling air and intensifies the cooling process. I il. (L

Description

-

one

The invention relates to methods for aspirating the drying of liquid products, mainly synthetic detergents (CMC), and can be used in the chemical industry.

THE BOWL.

A: The purpose of the invention is to improve the quality with the supply of synthetic detergents and their subsequent cooling.

I The drawing shows a dryer for the realization of the proposed method. i The dryer contains a drying chamber by 1, having a conical part 2, line 3 of the input of the product being dried, media 4, line 5 of the dried product withdrawal, line 6 of the input of the heating medium, line 7 of the discharge, iHoro coolant, the collector 8 for atmospheric discharge cooling air (cooling agent), upper | level 9 of atmospheric air intake, lower level 10 of entering atmospheric air. ,

I The proposed spray drying method is as follows.

The dried product, for example, the CMC composition, is fed into the drying chamber 1 through LINE 3 to enter the dried product, sprayed by the sprayers 4. At the same time, high-temperature coolant is supplied through the coolant inlet line 6, the spent coolant is discharged through the outlet line 7.

The sprayed particles of the product being dried are dried in a high-temperature heat transfer medium. Next, get into the conical part 2 of the drying chamber, the dried particles are cooled to C with atmospheric air supplied in an amount of 2.0–3.5% of the amount of heat carrier, with air entering the conical part 2 of the KaNie pbi 1 drying unit and the lower 10 levels in the form of sweeps evenly distributed around the circumference. At the upper level 9, air is supplied along the descending line at an angle of 12-18 to the horizontal plane, and at the lower level 10 - along the ascending line at an angle of 45-70 °. This creates a swirling flow of cooling air, thereby intensifying the cooling process. The process of crystallization of residual moisture

1386825

(6-10%) is more intense, which leads to the hardening of the surface of the particles, reducing the adhesive properties of the latter.

The proposed method allows the cooling of particles of various sizes evenly. This is achieved by the fact that small and medium-sized particles, falling into a stream of cooling air, are captured at the upper level by this stream and thrown into the center. Medium-sized particles are then withdrawn via the outlet line 7 of the finished product. The smallest particles are retained by air flows in the central zone of the conical part of the dryer in: Weighted state, creating a cloud. These particles coagulate with larger particles coming from above (still hot and therefore sticky) and between themselves. As the size and weight of the granules increase, they fall down, and are removed from the dryer through a line 5 of the dried product outlet. This improves the particle size distribution of the finished product. Larger particles that fall into the zone of action of the upper cooling air flow, due to the large inertia, only slightly change their trajectory, fall into the lower stream of cooling air, are raised by this stream and then output through the exhaust line 5

Thus, larger particles, unlike small particles, fall twice into the active zone of cooling air flows, where the cooling intensity is higher than at the center of the cone, they have time to cool to the required temperature.

one

Claims (1)

Invention Formula The method of spraying heat sensitive materials by spraying them and interacting with a stream of gaseous coolant in the upper part of the drying volume and, introducing an additional stream of gaseous agent into the lower part of the volume, in order to increase quality during the drying of synthetic detergents, followed by their cooling, the introduction of additional flow is carried out at two levels, at the top of which the agent is directed downwards at an angle of 12-18, and at the bottom - upwards at an angle of 45-70 to the horizontal loskosti.