Regular nozzle for heat and mass transfer apparatus

 

(57) Abstract:

Regular nozzle for heat and mass transfer apparatus refers to the regular structures of nozzles that are designed to conduct heat and mass transfer processes in the gas (vapor)-liquid and can find application in chemical and other allied industries. The nozzle contains a package recruited from parallel sheets with tabs positioned at the angle of 25 - 45overtically directed on the surfaces facing each other in opposite directions and are made in the form of a flexible cord made of knitted sleeves, stacked on each sheet along a helical spiral with offset coils relative to each other. The nozzle provides the efficiency of mass transfer and reducing labor in its manufacture. 1 Il.

The invention relates to constructions of regular nozzles designed to conduct heat and mass transfer processes in the gas (vapor)-liquid, and can find application in chemical and other allied industries.

Known regular nozzle (ed.St. N 1373424 from 28.05.86,, CL B 01 D 53/20. Regular nozzle), which includes sheets with corrugations oriented SUP>. The ratio of the height of the additional ribs to his step 0.08 to 0.2, which allows to intensify the process of heat transfer due to improved terms of redistribution of fluid in the volume of the Packed layer.

Also known unit of Packed material for mass transfer columns (U.S. patent N 5413741A from 01.03.94 year, NCI 261-112.2, 428-183. The Packed material with nested elements for distillation columns, prototype), containing a pair of parallel plates forming between them the channels that provide the distribution of the liquid and steam phases in the whole volume of the column. Each plate has corrugations with vertices located at an angle to the corrugation of the adjacent plate, and two sides, one of which is turned towards the second plate of that pair, and the other in the opposite direction. At least one plate of each pair of holes located at the intersection of the corrugations of the two plates. The holes are inserted the tops of the corrugations of the second plate that protrude outward beyond the opposite side of the first plate, creating a hydraulic resistance to the flow moving in the channel between the opposite side of the first plate and the plate adjacent pairs, and increasing toprow second plates are made of extra holes, through which part of the fluid moving along the opposite side of the first plate, passes on the opposite side of the second plate, which results in better dispersion of the liquid in the nozzle block.

A disadvantage of the known constructions is that to perform corrugated plates need to have stamps for specific configurations to obtain the required specific surface area of the plates. It requires more labor, which, in turn, increases the cost of the nozzle.

The purpose of the invention is improving the efficiency of mass transfer and reduce labor costs in the manufacture of the nozzle.

The objective is achieved by the fact that in regular nozzle for heat and mass transfer devices containing package recruited from parallel sheets with tabs, which are located at an angle of 25 - 45orelative to the vertical and is directed at the surfaces facing each other in opposite directions, the projections made in the form of a flexible cord made of knitted sleeves, stacked on each sheet along a helical spiral with offset coils relative to each other.

The implementation of the protrusions thus enabled:

depending on the density (Ude the optimum surface of the nozzle;

depending on the number of moves and the step of winding to get the items with different specific surface area and different channels (free cross section) between the tabs;

to improve the efficiency of the nozzle, not only by increasing its specific surface area, but also by improving the separation efficiency of the nozzle, so as porous mesh harness is a good separator and drainage to move the liquid toward the gas flow without disruption of the droplets;

depending on the geometric size and configuration of the harness to change the settings of the nozzle;

reduce labor costs for manufacturing the nozzle.

The authors are not known from the existing prior art nozzles, in which the efficiency of mass transfer and the reduction of labor costs in manufacturing was achieved in this way.

The drawing shows a nozzle element regular packing for heat and mass transfer devices.

The nozzle includes a stacked package flat parallel sheets 1 with the tabs 2, arranged at an angle of 25 - 45orelative to the vertical and is made in the form of a flexible cord made of knitted sleeves, which are stacked on the sheet 1 along a helical spiral with offset coils relative to each other is sporogony in opposite directions. The sheet 1 may be perforated or corrugated.

Structured packing is as follows.

The liquid phase is fed to the upper end of the nozzle and flows in a thin film on the surface of the sheets 1, interacting with an ascending stream of gas (steam). The protrusions 2 in the form of a flexible strap made of knitted sleeves, turbulizer liquid film, thereby increasing the surface contact of the phases due to its intense update.

The tilt angle of 25 - 45oprojections to the vertical axis and their corresponding execution provides more efficient use of the working volume of the Packed layer due to the effective redistribution of liquid on the surface of the Packed items.

The content of the elements of the nozzle with the tabs of the knitted sleeves allows to get the effect of separation and drainage, which excluded breakdown drops when moving fluid against the flow of gas.

Offer regular nozzle easy to manufacture and does not require the manufacture of stamps, if the configuration of the sheet does not change that significantly lowers the cost of the nozzle and the complexity of its manufacture.

Regular nozzle DL is orogeny at an angle of 25 45orelative to the vertical and is directed at the surfaces facing each other in opposite directions, characterized in that the projections made in the form of a flexible cord made of knitted sleeves, stacked on each sheet along a helical spiral with offset coils relative to each other.

 

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