SU1346228A1 - Drum granulator - Google Patents

Abstract

The invention relates to the preparation of a product in granular form, can be used in the microbiological, food, chemical and other sectors of the industry and makes it possible to increase the yield of the finished product. When the drum 1, which has an angle of inclination in the direction of movement of the product, is rotated, the product on the blades 10 drops to form a curtain of material. A part of the product is fed back with a pin 11 and through the nozzle 4 is fed to the head of the rotating drum, where a curtain of dry material forms, which is sprayed with a pulverizer L. Desiccation of the material at the required residual moisture is carried out by introducing the coolant through the nozzle 3 into the head of the rotating drum. The spent coolant is removed through the nozzle 7 of the discharge chamber 6. Commercial and coarse fractions are withdrawn through the nozzles 8 and 9 of the discharge chamber, respectively. The last turn of the reverse hollow jaw is made tapering along the length of the arc bounded by the central angle determined by the formula. 4 arcsin d / 0.5-0, - 2h, where D {is the inner diameter of the drum, m; h - the greatest height of the reverse hollow jaws, m; moreover, the ratio of flow sections on the last turn of the reverse hollow screw in the drum head is chosen from conditions 2.5-6, where FI is the largest section area on the last turn of the reverse hollow screw in the head part of the rotating drum, p2 is the smallest section on the last turn of the reverse hollow shneke at the head of the rotating drum. 4 il. "(L co 4 a: y tsD 00

Description

The invention relates to the field of obtaining a product in granular form and can be used in the microbiological, food, chemical and other sectors of the national economy.

The aim of the invention is to increase the yield of the finished product.

FIG. 1 shows a drum granulator, general view; in fig. 2 is a section A-A in FIG. one; in fig. 3 shows a general view of the byproduct with a return screw 11 and through the nozzle 4 is fed to the head of a rotating drum, where a curtain of dry material is formed, to which pulp is sprayed by means of a spray device 5. Drying of the material to the required residual moisture is carried out by introducing the coolant through the nozzle 3 into the head of the rotating drum. The exhaust coolant of the remote coil of the reverse hollow shine is fed through the pipe 7 of the unloading fecal part of the rotating drum; in fig. 4 - graphs of Gi / G2 versus I, for various p | / p2, where GI is the capacity of the granulator with a tapering section on the last turn of the reverse hollow screw at the head of the rotating drum; G2 is the capacity of the granulator with a reverse hollow fixed-cross-pinion, FI and p2, respectively, are the largest and smallest of the cross-sectional area on the last turn of the reverse half of the auger; K is the central angle of the arc at which the last turn of the reverse hollow screw is made tapering.

The granulator includes an obliquely located rotating drum I, a loading chamber 2 with nozzles 3 supplying heat carrier and a nozzle 4 supplying an external retur, a spraying device 5 for feeding pulp, a discharge chamber 6 with nozzles for leaving the heat carrier 6, leaving the product fraction 8 and coarse fraction 9. The rotating drum is provided along the entire length with blades 10 for creating a curtain and a return hollow screw 11 for transporting the inner retur from the tail to the head part of the rotating 15

20

Measures 6. Commodity and coarse fractions are withdrawn, respectively, through pipes 8 and 9 of the discharge chamber.

Example. Ammophos pulp with a moisture content of 30% and a pH of 4.5-5.0 is supplied by a spray device (nozzle) in an amount of 210-280 t / h into a 0.7 m diameter drum and 2 m long. The temperature of the coolant is 550-560 ° С . The ratio p | / p2 varies from 1 to 6.5. Output capacity {fraction 1-4 mm) 150-200 t / h for Pi / p2 I.

With a Pi / p2 ratio of 2.5-6, the productivity increases by 16-18%. 25 G1, with a further increase in the Pi / p2 ratio, the material is jammed in the reverse hollow screw, which leads to the apparatus being out of order. Performance

tea 1;

thirty

F.

2.5

the granule of the torus is increased slightly, which is of no practical interest.

The final turn of the hollow reverse screw to the head of the rotating drum is tapered, which allows a thinner drum. The last turn of the reverse-5 change the period of the material in the zone of the hollow screw is made tapering over the length of the arc, limited by the central angle A, determined by the formula

Well, the contact of the veil and pulverized pulp. The period of unloading the material from the reverse hollow auger of a constant cross section is about 0.25 of the rotation period of the rotating drum through 360 ° (the residence time of the loading opening of the reverse hollow auger in the bed of the pouring product). When performing the last turn of the hollow auger in the head of the rotating drum, tapering X 4arcsin

V 0.5 -

0.25 About DS - 211sh "

where Ob is the inner diameter of the drum, m; hujii - the greatest height of the reverse hollow auger, m,

moreover, the ratio of flow sections on. reduced artificial feeding of the material - "..."

its expiration is almost up to 0.5 period of rotation of the rotating drum by 360. At the same time, the hydrodynamic situation in the contact zone of the sprayed pulp of the last turn of the reverse hollow screw in the head part of the drum is improved

p condition-gr - 2,5-6, where P | and p2 correspond t

The largest and smallest areas are the Q-paps and the curtain due to the reduction of the pulsation section on the last turn of the reverse hollow auger at the head of the rotary drum.

Pellet torus works as follows.

oscillations of the coolant in the head part of the drum, the uniformity of the curtain itself increases, resulting in intensified processes of heat and mass transfer, the uniformity of granulon oscillations of the coolant in the head part of the drum increases, the uniformity of the heat and mass exchange increases, Granulo homogeneity increases. When the drum 1 rotates, which has 55 metric composition of the material, it raises the angle of inclination in the direction of the movement of the products-with the output of the product fraction, i.e. an increase in the capacity of the blades 10 is produced on the finished product, causing a curtain of material. Partduktu.

the product with the return screw 11 and through the nozzle 4 is fed to the head of the rotating drum, where a curtain of dry material is formed, which is sprayed with a pulverization device 5. Drying of the material to the required residual moisture is carried out by introducing the coolant through the nozzle 3 into the head of the rotating drum. The spent heat carrier is removed through the pipe 7, the discharge pot is fed through the pipe 7 of the discharge chamber.

Measures 6. Commodity and coarse fractions are withdrawn, respectively, through pipes 8 and 9 of the discharge chamber.

Example. Ammophos pulp with a moisture content of 30% and a pH of 4.5-5.0 is supplied by a spray device (nozzle) in an amount of 210-280 t / h into a 0.7 m diameter drum and 2 m long. The temperature of the coolant is 550-560 ° С . The ratio p | / p2 varies from 1 to 6.5. Output capacity {fraction 1-4 mm) 150-200 t / h for Pi / p2 I.

With a Pi / p2 ratio of 2.5-6, the productivity increases by 16-18%. With a further increase in the Pi / p2 ratio, the material is jammed in the reverse hollow screw, which leads to the device getting out of order. Performance

tea 1;

F.

2.5

the granule of the torus is increased slightly, which is of no practical interest.

Performing the last turn of the hollow return screw to the head of the rotating drum with tapers allows the period of the material to enter the contact zone of the curtain and the pulp to be sprayed to be changed. The period of unloading material from the reverse hollow auger of a constant cross section is about 0.25 of the rotation period of the rotary drum through 360 ° (the residence time of the inlet of the reverse hollow auger in the bed of the pouring product). When the last turn of the hollow auger screw in the head of the rotating drum is performed, tapering orgapes and curtains reduce the pulsation oscillations of the coolant in the head of the drum, increase the uniformity of the curtain itself, as a result of which heat and mass transfer processes are intensified, the uniformity of the particle size distribution of the material increases, enhances the formula of the invention

A drum granulator containing a rotating drum with blades fixed on its inner surface, a hollow reverse cheek located in the drum, a loading chamber and a discharge chamber located at opposite ends of the drum, pipes for introducing bulk material and heat carrier and a spraying device differing from that, in order to increase the yield of the finished product, the last turn of the return screw at the head of the drum at the arc length limited by the central angle I, ,, is determined by the formula

; 4 arc sin,

  11lvh ..

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where Ob is the inner diameter of the drum, m; Lshn - the greatest height of the reverse hollow screw, m;

the edge of the line is made tapering, and the ratio of flow sections on the last turn of the reverse hollow screw at the head of the drum conditionally satisfies Fi / F2 2.5-6, where FI and p2 are respectively the largest and smallest area of the cross section on the last turn of the reverse hollow screw to the head I rotate the parts 15 times the drum.

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Claims (1)

Claim A drum granulator comprising a rotating drum with blades mounted on its inner surface, a reverse hollow screw located in the drum, a loading chamber and an unloading chamber located at opposite ends of the drum, nozzles for introducing bulk material and a coolant, and a sawing device, characterized in that, in order to increase the yield of the finished product, the last turn of the inverse screw in the head of the drum along the arc length limited by the central angle λ, determined by the formula λ = 4 arc sin 70.5-- ¾ ^ ¾ _f ^y De — 2pshn ⁷ 5 where De is the inner diameter of the drum, m; hшн - the maximum height of the reverse hollow screw, m; the edge of the string is made tapering, and the ratio of the bore sections at the last turn of the inverse hollow auger in the head ^and trap parts of the drum conditionally satisfies F1 / F2 = 2.5-6, where F | and Pr, respectively, the largest and smallest cross-sectional areas on the last turn of the inverse hollow screw in the head of the rotating drum. Aa Figz FIG. 9