SU797710A1 - Contact tray - Google Patents

Description

This goal is achieved by the fact that the partitions are curved along the curve described by the equation

) (-)

where P; - the length of the current beam extending from the center of the overflow to the intersection with the partition and a tangent drawn from the end of the radius r turned at an angle Vi;

.x.i- current angle of rotation

sa g;

ct is the limit angle of rotation of the radius r; / V. - the angle of division of the circle peAO

parting;

R is the radius of the dish;

g "- overflow radius;

i is the dividing point number

(i 0,1,2,3)

and are located relative to each other at the same distance and at an angle of 9 ° relative to the exit edges of the gas (steam) elements.

The baffles are installed relative to the base of the plate at a distance of 0.05-0.1 from the height of the baffle, and the upper part of the baffles is slotted and equipped with tabs bent in the direction of the gas-liquid flow.

Figure 1 shows a plate, a longitudinal section; figure 2 - the same cross section.

The plate consists of a base 1 with contact elements 2, in the form of gas holes 3, the edges of which are located on the tangents to the circumference of the overflow and directed at an angle to the base of the plate. In the center of the plate there is an overflow 4, equipped with a disk 5. Above the base with a gap 6 there are curved shaped guide walls 7, which form channels 8 for the movement of gas-liquid flow, as well as slots 9, made in the upper part.

The contact plate works as follows.

The fluid entering the periphery of the tray is evenly distributed between the channels 8. The pressure of the liquid in the channels 8 from the wall of the column to the center overflow 4 results from the injection of gas into the liquid layer. Part of the fluid flow from above the lower edge of the guide walls 7, moves along a curved path corresponding to the shape of the channel 8, and the other part of the fluid located between the bottom edge of the partition 7 and the base of the plate 1, makes a rotational motion.

Splitting the base of the tray with baffles into a series of channels reduces the transverse mixing of the fluid and creates a concentric difference along the length of the channel, as well as obtaining lines of liquid flow of the same length, with the liquid in each channel coming into contact with an equal amount of gas.

The presence of curvilinear partitions on the plate, curved along the curve described by the indicated equation, makes it possible to obtain a constant height of the gas-liquid layer on the plate regardless of the gas and liquid loads. The arrangement of the guiding partitions at different points of the plate perpendicular to the tangents drawn to the overflow circumference, and, consequently, to the output edges of the gas holes, allows the most efficient use of the kinetic energy of the gas flow both to move the fluid to the overflow and to interact with it. gas. The intensity of fluid movement increases with increasing pressure across the gas, which makes it possible to equalize the height of the liquid layer over the radius of the tray at high liquid loads and to achieve uniform gas distribution.

The presence of a gap between the base of the plate and the lower edge of the guide partitions allows an increase in the residence time of a part of the liquid on the plate and performing a rotational movement. Increasing the residence time of the liquid on the plate increases the separation efficiency. , The reduction in transverse mixing of the liquid on the plate due to the guiding partitions, the use of the transport effect to ensure uniform distribution of the contacting phases, the presence of a gap between the base of the plate and the lower edge of the partitions all contribute to increasing the permissible loads for gas and liquid and increasing the efficiency of the ring plates.

The presence in the upper part of the guiding baffles of the slots with tabs bent in the direction of the gas-liquid flow allows leveling the liquid gradient across the channel width and between the channels, and also using the dynamic pressure of the moving gas-liquid layer in the channels to increase the permissible loads on the liquid.

Such an embodiment of the tray allows efficiently carrying out the mass transfer process between phases with a more complete degree of component recovery, as well as increasing the allowable loads on the contacting phases.

Claims (3)

1. Contact plate for heat and mass transfer of columns, containing a base with a central overflow and directional elements for gas fnara) located along the tangent to the circumference of the overflow, and guide walls, characterized in that, in order to increase the permissible loads for gas (steam) and liquid and reducing the uneven distribution of the gas-liquid layer on the tray, the baffles guiding along the curve described by the equation; p..V (r-r) -T-) current beam length PI the overflow from the center to the intersection with the partition and the tangent drawn from the end of the radius r turned by the angle the current angle of rotation - Ael- radius g; d - limit angle that radius r; g / i, is the angle of division of the overflow circle into parts; R is the radius of the dish; g - overflow radius; 1 - dividing point number (, 1,2,3 ...) and are located relative to each other at the same distance and at an angle equal to 90 relative to the exit edges of the directional elements for gas (steam). 2. A plate according to claim 1, wherein the guide partitions are mounted relative to the base of the plate equal to 0.05-0.1 of the height of the partition. 3. A plate of popp. 1 and 2, characterized in that the upper part of the guide partitions are made with slots and are provided with tabs bent in the direction of movement of the gas-liquid flow. Sources of information taken during the examination 1. Patent of the GDR No. 695N1, cl. 12 a 5, 02.03.59. 2, Equipment, its operation, repair and corrosion protection in the chemical industry. Collection NIITHIM, M.,., 1969, issue 2, sb-a. 333333)) ti) 3 EE five.  C (C ( c t c (  6 3 1