SU816477A1 - Contact device for heat mass exchange apparatus - Google Patents

Description

(54) CONTACT DEVICE FOR HEAT AND MASS EXCHANGE EQUIPMENT

The invention relates to mass-transfer apparatus in which gas interacts with a liquid, and can be used in absorption and desorption processes, in heat exchange processes between gas and liquid, for wet cleaning of gases from dust.

A straight mass mass transfer device is known, which contains an overflow pipe installed in the bulkhead of a mass transfer apparatus. The liquid enters the overflow pipe, overflowing through its upper edge, flows down the tube walls and is sprayed with gas passing at high speed through the constriction of the tube j | l.

The disadvantage of this mass transfer device is the unequal treatment of liquid with gas and gas with liquid. Insufficient treatment of gas with liquid reduces the effect of absorption, for example, when cleaning gases from gas and solid impurities

In addition, there is no intensive and uniform mixing of the liquid and gas, which does not ensure uniform processing of the liquid and gas throughout the entire volume.

 A mass transfer device is known, which is a combination of a bubble plate with an additional zone of contact between the phases in the inter dish space. The device consists of a bubble plate, overflow tubes installed in it, and discs placed below the bottom of the tubes with a small gap. The liquid from the bubbling plate flows through the overflow tubes and then through the annular gap in the form of a pipe and disks, forms a film that overlaps the cross-section of the apparatus. The gas, breaking through the liquid film, breaks up its Н-г droplets, increasing the contact surface and then bubbling through the liquid on the 2J plate. However, the mass transfer device does not allow it to be used in continuous flow mode, i.e. in cases where gas and liquid move. with in one direction.

 A contact device for heat and mass transfer apparatus is known, comprising a horizontal partition, an overflow tube and a bottom pan arranged under it, made in the form of a bottom with a valve located above it, forming an annular gap 3 with the upper part of the bottom,

However, the known device does not ensure the bubbling of gas through a liquid while simultaneously spraying the liquid.

The purpose of the invention is to intensify the process by providing a gas bubble through the liquid while simultaneously spraying the liquid and washing this spray with sparged gas.

This goal is achieved by the fact that, in the proposed device, the upper edge of the pallet is attached to the horizontal partition, and its side surface is provided with holes arranged along the height, the lower of which are located above the lower section of the overflow pipe.

It is advisable to make the pallet u-shaped.

FIG. 1 shows a longitudinal section of the device; in fig. 2 - node T in FIG. one; in fig. 3 - top view. In the drawings, the arrows indicate the direction of movement of the liquid, the double arrows indicate the direction of movement of the gas.

The contact device contains overflow tubes 1, installed in Partition 2, podn 3, i-shaped 1, placed under the partition and overlapping the lower ends of the overflow tubes. The pallet on the side walls has openings 4 for the exit of gas and liquid. The partition is fixed in the housing 5. Each pallet can overlap one or more overflow tubes. Pallets can be of different or equal length. If necessary, several proposed devices can be used, installed in series in one package.

The contact device works as follows.

The liquid entering the partition 2 flows in a thin layer along the walls of the pass-over tubes 1 into the tray 3 to the level of the lower row from the holes 4, thus blocking the outflow of gas from the tubes. The gas entering the overflow tubes 1, washing the surface of the liquid in the tubes, barbotirue

through the liquid in the tray in the form of small bubbles and intensively interacts with it. At a sufficient velocity of the gas being bubbled, dynamic foam and liquid splashes are created above the surface of the liquid, which are carried along with the gas stream through the openings 4, creating liquid spraying over the partitions.

In addition, part of the liquid ejected by the gas into the upper part of the pan flows down their inclined walls past the holes. The gas passing through the holes at the same time picks up and disperses the liquid. The resulting spray of liquid, constantly washed with gas, gradually settles on the next partition 2.

In this way, good gas treatment with liquid occurs during its bubbling in pan 3 and spraying the liquid with gas under partitions.

Claims (3)

1. A contact device for heat and mass exchangers, including a horizontal partition, an overflow tube and a pallet located under it, characterized in that, in order to intensify the process by providing gas sparging through the liquid while simultaneously spraying the liquid and washing this spray with splashed gas, the upper edge the pallet is attached to the horizontal partition, and its side is along (The top is made with holes located along the height, the bottom of which are located above the lower edge of the overflow tube. 2. A device according to claim 1, characterized in that the pallet is i-shaped. Sources of information taken into account in the examination 1. Bl dick IG, and others. Works UNIHIM. 1963, no. 10, s. 36-40. 2. Ramm V.M. Absorption of gases. M., 1976, p. 435-436. 3. Authors certificate of the USSR 204977, cl. At 01, 1966.