SU731232A1 - Plant for drying granulated materials - Google Patents

Description

(54) INSTALLATION FOR DRYING GRANULATED MATERIALS

one

This invention relates to a drying technique and can be used in the coal, chemical, food and other industries.

A known device for drying granulated materials, comprising a pneumatic tube connected to the furnace, connected in series with a rotating drum, and a granulator for loading material into the pneumatic tube 11.

The disadvantages of the known installation are the low productivity and quality of the granules due to the destruction of the latter.

The purpose of the invention is to increase the performance and quality of the object.

The goal is achieved by the fact that the pneumatic tubing has a pinch in the lower part, and a bell in the upper part, in which a conical divider is installed with an opening angle of 6-12 °, with the flow section of the pneumatic tubing being 2.1-2.6 , and its working height is 15-10 internal diameters.

In addition, the socket and divider have the same height and opening angle.

The divider in cross section has the shape of a triangle or quadrilateral with concave sides.

In addition, the drum is made with a diameter equal to the diameter of the pneumatic tube, and with a length equal to 50 diameters.

FIG. 1 shows schematically the installation described, vertical section; in fig. 2 and 3 are embodiments of a dissector (section A-A in Fig. 1).

10 The installation contains a furnace 1 in which the gas produced during the production of dusty technical carbon is burned, a mixer-granulator 2, a pneumatic tube 3 with a pinch 4 in the lower part, and a socket 5 with a conical divider 6 installed in it, having a opening angle of 6- 12 ° and a triangular cross-section or a quadrilateral with concave sides, a separator-expander 7, a valve 8, a rotating drum 9 with a rear head 10,

20 installed above the hopper 11.

The flow section of the pneumatic tube 3 is 2.1-2.6 of the clamping section 4, and the height is 15-10 internal diameters.

The drum 9 has a diameter equal to the diameter of the pneumatic tube 3, and a length equal to 50 of its diameter.

The installation works as follows.

From the blender-granulator 2, the wet granules of carbon black enter the middle part of pneumatic tube 3, in which, descending to pinching, are dried and then picked up by coolant and due to the dissector 6 in the form of several streams enter the separator-expander 7, where the speed is deposited in the lower part and roll down to the latch 8, through which the rotary drying drum 9 enters, and, having passed the back head 10, are poured into the hopper 11.

Waste gas from the process of the production of dusty carbon black is burned in the furnace 1. The flue gases formed after their combustion with a temperature of 950-1050 ° C are mixed with a recycle or cold air in a ratio of 1: 3-1 and with a temperature of 450- 750 ° C enters the pneumatic tube 3. The passage of the clamp 4, they are partially cooled due to the "input effect, acquire a speed of 10-23m / s and carry the wet granules up. In the gas turbine 3, the coolant (a mixture of flue gases with air or recirculation) is gradually cooled to a temperature of 180-310 ° C and at an average speed of 6-11 m / s leaves it into the separator-expander 7, while entering the separator-expander, it meets with a distributor 6, whereby the velocity of the central jet is quenched, and the flow is divided into three or four separate streams having a lower speed and direction to the upper wall sections of the separator-expander 7. The total average coolant velocity in the upper part of the separators Attenuator 7 is reduced to 0.2-0.6 m / s. Upon leaving the separator-expander 7, the coolant is divided into two streams: one stream is sent as recirculation to the furnace 1, the other to the electrostatic precipitators to collect dust from it.

The granules entering the warehouse have a residual moisture of 0.12-0.5% and an abrasion resistance of 85-90%, sufficient for their transportation to the consumer both in hopper cars and in bags. The yield of granules with a diameter of less than 0.1 mm is 0.5-2%, which is significantly less than the maximum permissible value.

The proposed installation allows to increase the productivity of the carbon black drying unit by increasing the yield of marketable products.

Claims (4)

1. Installation for drying granular materials, for example carbon black, containing a pneumatic tube connected to the furnace, connected in series with a rotating drum, and a granulator to load the material into the pneumatic tube, characterized in that, in order to increase the productivity and quality of drying, the pneumatic tube is clamped in the lower part, and in the upper part there is a bell in which a conical divider is installed with an opening angle of 6-12 °, and the cross section of the pneumatic tube is 2.1-2.6 bushing, and its working height is 15-10 internal diameters. 2. Installation according to claim I, characterized in that the socket and the divider have the same height and opening angle. 3. Installation according to claim 1, characterized in that the divider in cross section has the shape of a triangle or quadrilateral with concave sides. 4. Installation under item 1, characterized in that the drum is made with a diameter equal to the diameter of the pneumatic tube, and with a length equal to 50 of its diameter. Sources of information taken into account in the examination 1. Patent of Germany No. 972289, cl. 82 a 39, published. 1959. Aa A-fl