SU1259993A1 - Installation for drying liquid food materials with increased adhesion in a layer of inert bodies - Google Patents

Description

The invention relates to food rations, namely, installations for drying liquid thermolabile materials with increased adhesion, and can be used in chemical, pharmaceutical and other types of chemicals.

The purpose of the invention is to intensify the drying processes and improve the quality of the product.

Figure 1 shows the general scheme of an installation for drying liquid food products in a layer of inert bodies; Fig, 2 is a diagram of a cone-shaped insert with a spiral winding about

The installation contains a heat generator 1, a nozzle 2 for spraying material on inert bodies 3, a freely rotating cylinder 4, a drive drum, a drum 5 with an inlet 6, fan nozzles 7, a cone-shaped valve with spiral winding 9, a housing 10, a drive II with a shaft, auger

12dl of the product, fan shore 13, cyclone 4o. Drum 5 and cylinder 4 are made perforated, and inert bodies 3 are placed inside C11pindra 4.

The installation works as follows.

Air supplied by the fan

13c, the heat generator 1 is heated and supplied to the inside of the cylinder 4. The drum 5, with the cylinder 4, is rotated from the drive shaft I1.

Inert bodies 3 are placed in a freely perforated cylinder 4 with a longitudinal fan nozzle 7 on the inner surface of the drum 5, a drying object is sprayed by a nozzle 2. The inner body 3 with the sprayed material is caught by the fan nozzles 7, lifted by a certain angle relative to the horizon and poured off. this in the air stream. Intense airflow occurs intensively.

with a film of hot air applied at a speed higher than

soaring speeds, while this particle of inert bodies with applied material is advanced a distance from the inlet along the length of the drum. Inert bodies with dried and partially cleaved material fall onto a cone-shaped insert 8 with spiral winding 9 which rotates around an axis, while the auger spirals are displaced while rotating.

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ki to the outlet nozzle of the drum, throw the body along it in the direction of the spray area. At the expense of this, there is an additional cleavage of the dry product from the inert and a more uniform distribution of inert bodies along the length and cross-section of the apparatus.

The dried and chipped product is ground between the surfaces of the perforated drum 5 and the cylinder 4 and dropped into the zone of the screw 12, from where it is fed to the unloading. The fine particles are carried away by air into the cyclone I4.

Reducing the angle when the tapered insert with spiral winding is less than 40 to the cylinder axis results in an uneven distribution of inert bodies along the length and cross section of the cylinder at air speed and higher feed speed due to. non-directional movement of inert bodies in the decay zone. Inert bodies accumulate in the tail section of the drum, which causes the product to be sprayed not on inert bodies, but on the surface of the cylinder and longitudinal fan nozzles. The law of change in the temperature of the coolant along the length of the cylinder is violated, while the capacity of the plant decreases and the quality of the product decreases.

Increase the angle of the cone-shaped insert with spiral winding more than 60 to the axis of the cylinder leads to

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that the main part of the inert bodies is in the crucible zone, in the zone of high input temperature. Due to repeated spraying of the same inert bodies, the longitudinal and dry films of the product are disturbed and on the inert bodies, the inert bodies stick to the fan nozzles, the stability of the bots of the installation is disturbed. Plant capacity and product quality are reduced. .

When the ratio of the lengths of the cone-shaped insert with spiral winding and the cylinder is less than 0.4, the flight path of the inert bodies is insufficient for. the passage from the top of the cone of the insert to the spray zone, and with a ratio of these values greater than 0.6, results in the release of inert bodies from the cylinder.

When the diameter of the base of the cone-shaped insert is less than 0.75 (D-2e)

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the inert bodies are entrapped by a cone-shaped insert with spiral winding and accumulate in the tail section of the drum, and the circulation of the inert bodies is disturbed. Productivity and quality of the finished product is reduced.

With an increase in the diameter of the base of the cone-shaped insert over | 0.8 (D-2e), the cone-shaped insert proves to be partially immersed in a layer of inert bodies in the lower part of the cylinder, which leads to advancement and subsequent accumulation of the inertial in the middle part of the installation. In this case, multiple inert bodies without a film of the product are transferred from the tail section to the middle zone of the drum, the plant capacity and the quality of the finished product are reduced. Therefore, the volume of inert bodies should be chosen in such a way that the diameter of the larger base of the cone-shaped insert is 0.75-0.86 (D-2e).

With a feather width of a screw winding

 less than 0.09 of the base diameter, a part of the inert bodies falling on the cone-shaped insert with spiral winding is not caught by the cone-shaped insert (worm coils), pro-;

 The product does not cleave enough, which leads to burning of the product when it enters the high-temperature zone. With an increase in the width of the feather of the screw winding more than 0.1 of the base diameter, the trajectory of movement of the inert bodies overlaps. the next 184 auger feather (coil of auger) located in the direction of the inlet nozzle, which leads to a violation of the stability of the circulation of inert bodies along the contour of the cylinder, and, consequently, to a decrease in

 WA drying and sa intensity.

When the screw pitch on the cone-shaped insert is less than 0.08 of the cone height, the inert bodies increase by the cone-shaped insert with subsequent joining to the lower part of the tail part of the cylinder, which leads to disruption of the distribution of the inert bodies along the length and cross-section of the cylinder, the installation performance decreases.

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When the screw pitch is more than 0.12 from the B1Y-COTE of the cone, the capture of inert bodies by the cone-shaped insert decreases below the permissible value, inert 5 bodies, slippings along the surface of the insert, fall down. The stability of the circulation of inert bodies is not ensured, the capacity of the installation decreases.

 At the angle of the screw auger to the axial cone less than 60 °, part of the inert bodies is ejected from the cylinder and falls between the rubbing surfaces of the perforated bar 5 and the cylinder, which disrupts the grinding process and leads to unstable operation of the installation as a whole.

When increasing the angle of rotation rtepa of the screw to the axial cone more

 70 ° the flow of transported inert bodies has a fan-shaped form and is distributed practically along the entire length of the cylinder, which leads to inefficient operation of the cone-shaped

 inserts with spiral winding and, therefore, the installation as a whole.

Example. Inert metal bodies with a size of 3 mm rectangular in shape, mechanically suspended in a stream of purified and heated air, the initial product is dispersed through a nozzle (cheese, dried).

5 The experiment was carried out at constant air inlet and outlet temperatures, rotational speeds of the drum and a cone-shaped insert, air speeds higher than the soaring speed. The results of the experiment are summarized in the table.

As can be seen from the table, the drying process is optimal, if

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the tip of the cone is 40-60, 5; the ratio of the lengths of the cone-shaped insert and the cylinder is 0.4-0.6; the width of the feather of the screw of the winding is 0.09-0.1 of the diameter of the base of the cone, the step of winding is 0.08-0.12 of the length of the cone, The angle of rotation 0 of the auger feather to the axial cone 60-70 towards the base, while the solubility of the finished product is better than that required by TU 49800-81 (the serum is dry).

5 The implementation of the proposed installation allows to intensify the drying process and improve the quality of the finished product.

Satisfies requirements TU 49-800-8 (milk dry whey)

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Compiled by Y. Martyshov Editor N. Shvydka Tekhred L. Serdyuk she Proofreader L. Patay

Order 5154/2 Circulation 543Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Design, 4 ".

Claims (1)

INSTALLATION FOR DRYING LIQUID FOOD MATERIALS WITH INCREASED ADHESION IN A LAYER OF INERT BODIES, comprising a housing, a perforated drum with an inlet nozzle, equipped with a drive, and a perforated cylinder with a longitudinal fan nozzle, partially filled with inert bodies, installed inside it and equipped with a rotary drum, and a cone-shaped insert concentric: located inside the perforated cylinder and mounted on the drive shaft, characterized in that, in order to intensify the drying process and improving the quality of the finished product, the cone-shaped insert is equipped with spiral winding, the angle at the top of the cone is 40-60, the ratio of the lengths of the cone-shaped insert and the drum is 0.4-0.6, the feather width of the winding screw on the cone-shaped insert is 0.09-0, 1 from the diameter of the base of the cone, and the winding pitch is 0.08-0.12 from the height of the cone, while the feather of the screw of the winding is facing the axial cone at an angle of 60-70 towards the base. ί 1259993