SU718117A1 - Heat-mass exchange tray - Google Patents

Description

one

The invention relates to instrumentation of the processes of absorption, rectification, gas (vapor) - liquid flowing in the system.

A heat and mass transfer plate is known that includes a base mounted obliquely. In the direction of movement of the liquid, provided with contact elements, partitioning partitions and overflow devices 1.

A disadvantage of the known plate is the low efficiency of the heat and mass transfer process.

The purpose of the invention is to intensify the process of heat and mass transfer by increasing the time of contact of the phases.

The goal is achieved by the fact that the contact elements are made in the form of perforations of the shape of an ellipse with an opening arc length equal to 300-330 °, oriented to the opposite side of the fluid movement.

FIG. 1 shows a heat and mass transfer plate installed in the apparatus; in fig. 2 - contact element, longitudinal section; in fig. 3 - the same plan view.

The base 2 of the heat and mass transfer plate is installed in the housing 1 of the apparatus at an angle ip to the horizon, equipped with a central overflow device 3 and peripheral overflow devices 4.

The base 2 is provided with sectioning

partitions 5 and contact elements 6, made in the form of notches form

an ellipse with an arc length equal to

300-330 °.

Heat and mass transfer plate works as follows.

The liquid phase enters from the peripheral overflow devices 4 on the base 2 of the tray inclined toward the liquid side and moves along it, entering the central overflow device 3.

The gas flow expires from the guiding contact elements b and bubbles through the liquid layer.

As a result of fluid movement along the inclined plane of the tray

longitudinal non-uniformity of the bubble layer. The longitudinal sectioning of the web of the plate with partitioning partitions 5 prevents transverse unevenness of the bubbling layer. Due to this, a uniform bubbling layer is formed on the entire area of the dish.

As a result of the counter-current movement of gas and liquid, the necessary

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the contact time of the phases and the efficiency of mass transfer increase.

The angle of the limb of the guiding contact elements 6 is chosen taking into account the minimum diameter of gas bubbles, depending on the physical properties of the contacting phases, which virtually eliminates the failure of the liquid through the slits of the plate. In addition, the contact elements are in the form of an ellipse with an opening arc length of 300-330 °, which provides the maximum possible wetting perimeter, allowing the gas phase to be dispersed in the liquid layer as much as possible.

The hubbing elements 6 are arranged in a shahmatny order, their diameter and axial spacings are determined by the technological conditions of the plate, depending on the gas velocity in

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the free cross-section of the slots and the liquid load.

Claims (1)

Invention Formula A heat and mass transfer plate comprising a base mounted obliquely in the direction of fluid motion, C1 provided with contact elements, partitioning partitions and perebchnymi devices, characterized in that, in order to intensify the heat and mass transfer process by increasing the phase contact time, the contact elements are made in the form of notches of the ellipsa arc length equal to, oriented in the opposite direction of fluid motion. Sources of information taken into account in the examination 1. US Patent No. 2787453, cl. 261-114, 1957 (prototype). (iZ