SU1378886A1 - Method of effecting mass exchange in cross interaction of vapour (gas) and liquid - Google Patents

Abstract

The invention relates to methods of organizing the contact of phases in a vapor (gas) - liquid system, can be used in food, alcohol, chemical and some other industries and allows to intensify the mass exchange process by equalizing the residence time of the fluid particles. The injection of ocyniecT- fluid is such that the height of the pressure column of the liquid phase in the overflow device and the irrigation density at the plate inlet increase from the center to the periphery in proportion to the lengths of the arcs of the ellipses connecting the receiving and drain partitions of the same name. 2 ill., 1 tab.

Description

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The invention relates to methods for organizing the contact of phases into a vapor (gas) -liquid system and can be used in food, alcohol, chemical and some other industries.

The aim of the invention is to intensify the process of mass exchange by leveling the residence time of the fluid particles.

FIG. Figure 1 shows a diagram of the distribution of the liquid load at a single stage of phase contact; in fig. 2 is a view A of FIG. 1 (distribution of pressure pillars (H) fluid in the overflow device of the segment type).

The method of organizing the cross-precise interaction of vapor (gas) with a liquid involves sequentially alternating the input of the liquid phase under pressure to the plate in such a way that the height of the pressure column of the liquid phase in overflow devices and the irrigation density at the inlet of the plates increase from the center to the periphery in proportion to the lengths of the arcs of ellipses, the connection of the receiving and drain partitions of the same name, as well as the contact of the liquid with the upflow of steam (gas) in the gradient-free regime of perfect displacement and its flow to the bottom contact stage.

This method of interaction of vapor (gas) with a liquid ensures the realization of the contact of phases under conditions of ideal displacement through the liquid, in which almost all particles of the liquid flow have the same residence time in the contact zone. This mode of flow of the liquid phase is most preferable from the point of view of ensuring the maximum driving force of the mass transfer process and, consequently, the greatest separating capacity of the plates.

The condition of equality of the residence time on the plate of each individual volume of liquid can be written as follows:

Sj S, LI L, L,

where S, is the distance between the receiving point and the town, equal to the arc of the corresponding ellipse; L, - part of the liquid phase passing through

plate distance s.,. In accordance with the proposed method of organizing a cross-phase interaction of the phases, the fluid particles pass along a plate base of varying length, increasing from the center to the periphery. In this case, an increase in the length of the trajectory must be compensated for by an increase in the volume of the liquid flow and by the size of the pressure created in the overflow device, since with increasing length of the path of the liquid, the energy that is expended to overcome it increases.

of the same name drain re0

five

0

five

The movement of fluid particles in this case is carried out along elliptical paths that pass through the receiving and drain partitions of the plates of the same name.

Example. The interaction of steam (gas) with liquid on a plate with a diameter of (D) 1 m with a length of receiving and drain partitions (b) 0.7 m for the case of conditional splitting the base of the plate into 24 longitudinal sections with equal width in all cross sections. The path length of the fluid (S,), defined as the arc length of an ellipse with the help of the corresponding elliptic integral. The results of the integration, performed using a CM 1420 computer, gave the following S values, counting from the center to the periphery for each half of the plate: 0.7142; 0.7155; 0.7180; 0.7217; 0.7266; 0.7326; 0.7397; 0.7478; 0.7569; 0.7669; 0.7777; 0.7892.

From here, the values of the relationship of the current path length of the fluid to the maximum (Z / Zmax) are easily determined:

0.905; 0.907; 0.910; 0.914; 0.921; 0.928; 0.937; 0.948; 0.959; 0.972; 0.985; one.

The values given are valid for plates of any diameter at, 7.

Numerical values (5, / 5max) allow finding local liquid flow rates (L,) at the inlet of the tray from the ratio

thirty

L / g: with l- fij i

I s

five

0

five

five

where b) C

0

integral irrigation density in the column.

The values of H are determined in a similar way.

The table shows the calculated values of 5 ,. dl, 5; 0.6; 0.7; 0.8; 0.9 for the case of conditional division of the base of the container; 1ki into 24 longitudinal sections.

The number of subdivisions can be further increased, as a result of which the required accuracy of the distribution of the liquid load at the inlet of the tray and the height of the pressure cto; i6a in overflow devices will increase.

Promy c. The implementation of the proposed phase interaction method will significantly reduce the dimensions of the column apparatus, the energy intensity of the separation process, as well as the cost of manufacturing, installation and operation of the equipment.

Claims (1)

Invention Formula The method of carrying out the process of mass exchange with the cross-point interaction of steam (gas) with a liquid, including the injection of a liquid phase under pressure on the plate at the density of irrigation, increasing from the center to the periphery, the contact of the liquid moving from the receiving partition to the drain upstream steam (gas) and its flow through the overflow device onto the underlying contact stage, characterized in that the image of the height of the pressure column of the liquid phase in the overflow device and the density of the opouieHHH fluid at the inlet of the tray the process of mass transfer tensification by increasing the length of the arcs the alignment of the residence time of the liquid 5 ellipses connecting the like points of the same, the injection of the liquid is carried out in this way the receiving and drain partitions. the way that the height of the pressure column of the liquid phase in the overflow device and the density of the opouieHHH liquid at the inlet of the tray increase in proportion to the lengths of the arcs View A FIG. 2 Hi