SU1095919A1 - Mass-heat exchange apparatus - Google Patents

Abstract

MASS-HEAT EXCHANGE EQUIPMENT, containing a vertical cylindrical body, coaxial shaft with contact steps fixed at its height and overflow devices including inclined overflow trays located between contact steps centrosymmetrically around the shaft, characterized in that, in order to increase the efficiency of mass and heat exchange by reducing the residence time liquids in the apparatus, the trays are made in the form of alcohols, the upper ends of the trays are still flush with the periphery of the overlying contact stage tangentially to the inner wall of the housing, and the side edges of the trays are located at different levels.

Description

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The invention relates to mass transfer engineering, in particular to the design of rotary film apparatus for conducting mass transfer processes between gas (vapor) and liquid.

Known rotary film mass transfer devices, comprising a vertical cylindrical body, a coaxial shaft with contact steps fixed at its height and stationary overflow trays located between the contact steps centrosymmetrically around the shaft and made horizontally Cl.

A disadvantage of such apparatuses is the disturbance of liquid overflow in trays when the case deviates from the straight upright position, since at the same time at least some of the trays are inclined towards the flow of liquid.

The closest to the proposed technical essence is a rotary film mass-transfer apparatus, which has a vertical cylindrical body, a coaxial shaft with contact steps fixed at its height and flow-through devices that redistribute the liquid from one step to another and consist of several annular pockets mounted on the inner walls of the housing and associated with them inclined overflow trays. The annular pockets serve to receive liquid, bones, discharged from the periphery of the rotating stages, and the trays located between the steps centrosymmetrically around the shaft, ensure its discharge into the underlying stages 2.

However, the efficiency of the mass transfer of the known apparatus is not high enough, since the gaps between the steps intended for the placement of trays are not used for the mass heat exchange. In addition, in the annular pockets and trays, the liquid flows only under the force of gravity, as a result of which its movement is slow, especially in the annular pockets of the bottom of which are located in the horizontal plane. This leads to an increase in the residence time of the liquid in the apparatus, which is undesirable when processing thermo-mobile liquids.

The purpose of the invention is to increase the efficiency of mass transfer by reducing the residence time of the liquid in the apparatus.

This goal is achieved by the fact that in a rotor-film mass-transfer apparatus containing a vertical cylindrical body, a coaxial shaft with contact steps fixed at its height, and overflow devices including inclined

Reel trays located between the contact steps are centrosymmetrically around the shaft, the trays are made in the form of spirals, the upper ends of the trays are located flush with the periphery of the overlying contact stage tangentially to the inner wall of the housing, and the lateral edges of the trays are located at different levels.

Due to the fact that the upper ends of the trays are placed on the same level with the periphery of the rotating stage, the liquid from the latter is discharged directly to the upper ends of the trays. Since the latter are oriented tangentially to the inner wall of the body, and the side edges of the trays are located at different levels, the liquid jets are discharged from the stage directly into the channel of the trays along the tangent to them. By inertia, the liquid rushes in trays from their upper ends to the lower ones. Due to the curvature of the trays, the moving fluid is acted upon by centrifugal force, which presses it to the bottom of the tray. Due to this, the liquid reaches the lower end of the inclined tray, does not overflow prematurely through the lower side edge, despite the fact that the bottom of the tray is inclined and its lateral edges are located at different levels. This allows to increase the number of trays, without blocking the cross-section of the apparatus and, therefore, without increasing the hydraulic resistance to the passage of the gas flow. In this case, the bottom of the trays in the aggregate form a developed irrigated surface on which the processes of mass and heat exchange take place contributing to an increase in the Efficiency of mass and heat exchange in the apparatus as a whole.

Since the movement of the fluid occurs not only under the action of gravity force, but also due to inertia and, moreover, from the steps, the fluid flows directly onto the trays, its residence time in the apparatus decreases

On fi. 1 shows the proposed rotary film mass transfer apparatus, longitudinal section; in fig. 2 is a section A-A in FIG. 1.

The rotary film mass-transfer apparatus contains a vertical cylindrical body 1, a coaxial shaft 2, contact stages 3 fixed on the shaft 2, and stationary inclined overflow trays 4 in the form of spirals that act as overflow devices and located between the steps 3 centrosymmetrically around the shaft 2. One the lateral edge 5 of the tray 4 is located above the other side of its lateral edge 6 The upper ends of the 7 trays are placed on the same level with the periphery of the overlying stage 3 and are oriented tangentially to the walls of the housing 1, and the bottom

Claims (1)

sinking inclined overflow trays located between the contact steps centrosymmetrically around the shaft, characterized in that, in order to increase the mass and heat transfer efficiency by reducing the residence time of the liquid in the apparatus, the trays are made in the form of spirals, the upper ends of the trays are placed at the same level with the periphery of the overlying contact step along tangent to the inner wall of the housing, and the side edges of the trays are located at different levels.