RU160278U1 - MODIFIED PERFORATED CANVAS FOR HEAT AND MASS EXCHANGE DEVICES - Google Patents

Abstract

Modified perforated sheet for heat and mass transfer devices, including a sheet up to 1 mm thick, slotted slotted openings in the form of blinds with a step equal to no more than the sheet thickness, made with a width S of 0.2-2.5 mm, length L of 3 -12 mm, the ratio of the length of the slit L to its width S up to 60, the distance between the slotted louvre channels 1-5 mm, characterized in that every 2-4 rows of slotted louvered openings are introduced blind zones from 1 to 15 mm, the angle of inclination α slotted louver holes to the surface of the canvas is 30-70 °, the angle of inclination on slotted louvre channels β is equal to 30-60 ° to the horizontal coordinate axis.

Description

The invention relates to plate and nozzle devices for carrying out heat and mass transfer processes in chemical technology, petrochemicals, heat power engineering and other industries that implement these separation processes of mixtures.

It is known a unified perforated sheet for plate and nozzle contact devices containing a sheet with a thickness of not more than 1 mm, slotted slotted openings in the form of blinds with a width of 0.3-0.5 mm, with a step equal to not more than the thickness of the sheet, with an inclination at an angle of 30-45 °, the ratio of length to width from 13 to 25, slotted louvered channels directed at an angle of 30-45 ° to the horizontal coordinate axis, and a distance of 1-2 mm between slotted louvered channels [Patent for the invention No. 2236900, application No. 2003126821/15 dated 01.09.2003 “PERFORATED CANVAS FOR HEAT MASS EXCHANGE DEVICES ”]. The disadvantage of this canvas is the limited range of stable operation at high steam loads, due to an increase in steam speed, an increase in pressure drop.

It is also known that the perforated sheet adopted for the prototype for heat and mass transfer devices of a wide range of work, including a sheet up to 1 mm thick, slotted slotted openings in the form of blinds, with a step equal to no more than the sheet thickness, directed at an angle β equal to 30-45 °, the horizontal axis of the coordinates, the louvre slots are made with a width S equal to 0.2-2.5 mm, a length L equal to 3-12 mm, the ratio of the length of the slit L to its width S is up to 60, with an inclination angle α to the web surface of 30 -60 ° and a distance of 1-5 mm between the slotted louvered channels [Pa utility model tent No. 120582, application No. 2012109259/05 dated March 12, 2012 “PERFORATED CANVAS FOR HEAT AND MASS EXCHANGE DEVICES OF A WIDE RANGE OF WORK”].

The design solutions of the prototype provide an increase in the efficiency of phase contact with increased steam loads, an increase in the bore of the slit slotted openings due to an increase in their geometric dimensions, but, like the above analogue [Patent for the invention No. 2236900] has a limited range of stable operation in combination of low steam and high liquid loads, in the presence of a large amount of liquid and low gas flow on the surface of the canvas.

Inadequate (low) gas velocity due to the low flow rate and large gas cross-section, if there is a large amount of liquid on the surface of the web, can lead to liquid failure through the slotted louvres, which reduces the phase contact efficiency.

The aim of the invention is to eliminate the disadvantages of the known analogue and prototype, namely, increasing the efficiency of the phase contact in combination of low steam and high liquid loads by modifying the design of the canvas, the introduction of dead zones between groups of rows of blinds.

This goal is achieved by the fact that in the known perforated sheet including a sheet with a thickness of up to 1 mm, slotted slotted openings in the form of blinds, with a step equal to not more than the sheet thickness, made with a width S of 0.2-2.5 mm, length L, equal to 3-12 mm, the ratio of the length of the slit L to its width S up to 60, the distance between the slotted louvre channels 1-5 mm, blind zones from 1 to 15 mm are introduced through every 2-4 rows of slotted louvered holes, the angle of inclination α slotted louvered holes to the surface of the canvas is 30-70 °, the angle of inclination of slotted louvered channels β, equal to 30-60 °, to the horizontal coordinate axis. Due to the modification of the web, it becomes possible to select the optimum flow cross section for gas, which provides the necessary speed to eliminate liquid dips through slotted louvre openings, as well as the presence of blind zones allows a large amount of liquid to pass through the web, while ensuring uniform distribution of the liquid and gas phases, due to which the phase contact efficiency in a combination of low vapor and high liquid loads is increased.

In FIG. 1 is a perspective view of a modified perforated web; FIG. 2, the configuration of the slotted louvres, FIG. 3 disclosure of slotted louvre openings.

The modified perforated web (Fig. 1) contains a sheet 1 with a thickness of up to 1 mm, slotted slotted openings in the form of blinds 2 with a width S equal to 0.2-2.5 mm, with a step equal to not more than the thickness of the sheet, with an angle of inclination α to the surface of the web, equal to 30-70 °, the length of the slit L, equal to 3-12 mm, the ratio of the length L to its width S up to 60, slotted louvered channels 3, directed at an angle β equal to 30-60 °, to the horizontal coordinate axis, the distance 4, equal to 1-5 mm, between the slotted louvre channels 3 and blind areas 5 from 1 to 15 mm, the number of rows of louvered openings between the blind zones 2 to 4.

In FIG. 2 shows the configuration of the slotted louver holes 2.

In FIG. 3 shows the opening of the slotted louver holes 2.

Perforated canvas works as follows.

A uniformly distributed liquid flows along the upper surface of the perforated web parallel to the Y axis. Gas is supplied under the lower surface of the perforated web and passes through groups of rows of slotted slotted openings in the form of blinds 2, with an inclination angle a to the surface of the web of 30-70 °, and evenly distributed It occurs with a fluid flow, where a finely dispersed mixture of gas and liquid is formed with a highly developed phase contact surface, one of the main factors affecting the mass transfer rate. Gas passing through the web enters the overlying perforated web, and the liquid flows onto the underlying web. Thus, the phase contact efficiency in a combination of low vapor and high liquid loads is improved due to the modification of the web design, the introduction of blind zones between groups of rows of louvered openings.

List of references

1. Patent for invention No. 2236900, application No. 2003126821/15 dated 09/01/2003 "PERFORATED DOOR FOR HEAT AND MASS EXCHANGE DEVICES".

2. Utility Model Patent No. 120582, Application No. 2012109259/05 dated March 12, 2012 “PERFORATED CABIN FOR HEAT AND MASS EXCHANGE DEVICES OF A WIDE RANGE OF WORK”.

Claims (1)

Modified perforated sheet for heat and mass transfer devices, including a sheet up to 1 mm thick, slotted slotted openings in the form of blinds with a step equal to no more than the sheet thickness, made with a width S of 0.2-2.5 mm, length L of 3 -12 mm, the ratio of the length of the slit L to its width S up to 60, the distance between the slotted louvre channels 1-5 mm, characterized in that every 2-4 rows of slotted louvered openings are introduced blind zones from 1 to 15 mm, the angle of inclination α slotted louver holes to the surface of the canvas is 30-70 °, the angle of inclination on slotted louvre channels β is equal to 30-60 ° to the horizontal coordinate axis.

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