SU1302816A1 - Device for conveosion drying of flat articles - Google Patents

Abstract

The invention relates to a drying technique and can be used for convective drying of large-sized sheet products and materials after their washing and painting on a conveyor in a process stream. The purpose of the invention is to intensify the drying process and reduce energy consumption. Vertical rows of nozzles (C) 4 have slit holes. The upper walls of the 5 С 4 are curvilinear and form different-sized pockets with a rectilinear bottom wall 6. Their lines are parallel to the horizontal plane and pass through the center of the curvature of the upper wall 5. The drying agent is delivered in the form of flat jets directed downward at an angle of inclination C 4 to the vertical wet surface of the material being processed. Drops of moisture collide down into the collection box under the action of their own power of gravity and the forces acting on them. A part of the spent drying agent, saturated with vapor, is evaporated by heat, the other is discharged through channels 9 and sucked off by a suction box. The uniformity of the suction is due to a uniform increase in the cross section of these channels and the suction direction over the entire height of the chamber. 1 hp f-ly, 3 ill. , with "e (l cr

Description

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The invention relates to drying equipment and can be used for convective drying of large-sized sheet products and materials after they are washed and painted on a conveyor belt in a process stream. ;

The purpose of the invention is to intensify the drying process and reduce energy consumption,

FIG. 1 shows the installation described, vertical cross-section.} FIG. 2, section A-A in FIG. one; in FIG. 3, node I in FIG. one.

The installation contains a thermally insulated chamber 1, inside of which there is a conveyor 2 for moving products, placed on both sides of the products pressure casing 3, equipped with vertical radials of downward-inclined nozzles 4 with outlet slit openings having curvilinear upper walls 5 and flat bottom walls 6, as well as the exhaust duct 7, located in the lower part of chamber 1 along its entire length. The exhaust box 7 is equipped with a water trap 8, the Pel nozzles A have a different arc and are arranged in the order of its rise in the direction of the sushi flow (dry agent (from top to bottom) to the exhaust duct 7,

At the nozzle 4 there are pockets 9 of alternating, increasing in the direction of the exhaust duct of the section.

The best option is to perform injection boxes in which the curvilinear surface of the upper wall 5 of the nozzle merges with a rectilinear surface. the lower wall 6 of the overlying nozzle along a line lying in a horizontal plane (M-N) passing through the center O of the curvature of the upper wall of the nozzle, drawn by radius R (FIG. 3).

The curvilinear surface of the upper wall 5 of the nozzles is made in the form of a half branch of a hyperbola with the horizontal axis and radius of curvature R, and the straight surface of the lower wall 6 is parallel to the asymptote of this hyperbola.

Conveyor 2 is

roller with drive rollers 10 and supporting material in a vertical position rollers 11,

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The installation is equipped with a heat fan system containing a fan 12, a heater 13, a discharge duct 14, an exhaust duct 15, an exhaust pipe 16 with a throttle 17 connected in front of the heater 13..

Between the side walls of the chamber 1 and the exhaust duct 7 there are longitudinal slots covered by adjustable flaps 18,

Injection box 3 is provided with end walls 19, Chamber 1 has end walls 20 with working openings, overlapping elastic strips 21.

Water trap 8 is installed below the zone of connection of the exhaust duct 15 to the exhaust duct 7,

The installation works as follows.

The drying agent heated in the heater 13 is injected by the fan 12 through the discharge duct 14 into the pressure ducts 3, from which through the nozzles 4 it is fed as flat jets downward at an angle of inclination of the nozzles onto the vertical wet surface of the material being processed.

Moisture located on the surface of the material in the form of droplets collides downwardly in the moisture collector 8 under the action of its own gravity force and the vertical component from the force developed by a flat air jet under the action of the residual velocity head at the exit of the nozzle 4. the agent, which consumed the mechanical energy for the dropping of the droplets and saturated with vapor of evaporated under the action of the heat of moisture, partially passes through the channels limited by the distance between the sections of the nozzles 4 and the surface to be treated, and astrically discharged through pockets 9 formed by the upper 5 and lower 6 walls of adjacent nozzles 4 adjacent to the height. Exhausting the vapor-air mixture from the pockets 9 is removed through zones defined by the end walls 20 of chamber 1 and the end walls 19 of the discharge ducts 3, communicating with exhaust duct 7. The uniform suction of the vapor-air mixture from the pockets 9 over the entire height of chamber I is caused by a uniform increase in the cross section of these pockets

maiov in the direction of the suction coil 7, which makes it possible to equalize the resistance in the pockets throughout the whole, - those chambers 1,

The distribution of drying agent on the nozzles 4 of the injection ducts 3 occurs with minimal resistance, since each portion of the withdrawable drying agent into the next nozzle of the drying agent is cut off from the total flow parallel to the direction of its movement tangential (vertical) to the curvilinear surface of the upper wall 5 of the nozzle, which then gradually wrapped, wrung out the rest of the thread.

The moisture discharged into the water trap 8 does not participate in the further process of heat and mass transfer, as it is below the circulation level of the drying agent.

The spent drying agent is discharged through the exhaust air vent 15 by the fan 12 and is partially emitted into the atmosphere through the exhaust pipe 16.

Part of the drying afeHTa is fed for recycling, for which it is heated in the heater 13 and sent to the chamber through the discharge duct 14, the box 3 and the nozzle 4.

The exhausted drying agent removed through the exhaust pipe 16 (vapor-air mixture) is compensated for by sucking air from the atmosphere through horizontal slots provided between the walls of chamber 1 and exhaust duct 7. Balance of the amount of vapor-air mixture discharged and fresh air drawn in 2828164

spirit is provided by the throttles 17 and flaps 18.

During this process, the workpieces are continuously fed and moved through chamber 1 by conveyor 2,

Formula (Gzobre Shadow

) 0. I. Installation for convective drying of flat products, containing a heat-insulated chamber with a conveyor for moving products, placed on both sides of the latter

/ 5 injection boxes with vertical rows of inclined downward nozzles with exit slits for a drying agent and a exhaust box located in the lower chamber of the chamber

20 and equipped with a water trap, that is, with the fact that, in order to intensify the drying process and reduce energy costs, the nozzles have different dimensions, increasing

25 in direction to the exhaust duct, c. their upper walls have a curved surface, forming a c. direct-linear surface of the lower walls. overhead nozzles of different size mana 30, connected to the exhaust duct.

2. Installation under item I, (lt rf and - partly with the fact that the curvilinear surface of the upper steiki

The 35 nozzles mate with the rectilinear surface of the lower wall of the overlying nozzle along a line lying in a horizontal plane passing through the center of curvature of the upper

40 nozzle wall.

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Compiled by; Yu, Martinchik Editor S., Kulakova Tehred A. Kravchuk Proofreader. Roshko

Order 1895. Circulation 435 i Subscription VNIIPI USSR State Committee

for inventions and discoveries 11-3035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project 5 4

2

Claims (2)

Claim 10 1. Installation for convective drying of flat products, containing a thermally insulated chamber with a conveyor for moving products placed on both sides of the latter ' 15 pressure boxes with vertical rows of downwardly inclined nozzles with outlet slots for the drying agent and an exhaust box located in the lower part of the chamber 20 and equipped with a moisture collector, which means that, in order to intensify the drying process' and reduce energy consumption , nozzles. have a different length, increasing 25 n towards the exhaust duct, and their upper walls have a curved surface, forming with a rectilinear surface of the lower walls. overlying nozzles of various sizes, connected to a fume hood. 2. Installation according to π. I, characterized in that the curved surface of the upper wall of the nozzle 35 is conjugated with the rectilinear surface of the lower wall of the overlying nozzle along a line lying in the horizontal plane passing through the center of curvature of the upper wall of the nozzle. • Compiled by Yu. Martinchik