SU889023A1 - Plate for heat exchange processes - Google Patents

Description

(54) PLATE FOR HEAT AND MASS EXCHANGE PUSCES

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The invention relates to devices for carrying out the processes of rectification, absorption and chemisorption in a gas-liquid system.

A known contact plate for heat and mass transfer processes, made in the form of one hundred with longitudinal slits, along which the vertical strips are attached, under which the pallet is located, and but both sides of the sheet have holes with edges 1 bent to the slits.

The disadvantage of this tray is the narrow range of load variation for gas, limited by the minimum allowable gas (steam) velocity, the reduction of which leads to an unstable collision of two-phase flows, and the value of allowable ash at a gas velocity (steam) of over 2.0 m / s ( full section of the device). The entrainment of the liquid phase occurs due to the cross movement of the phases in the place of their separation, as a result of which the small droplets formed from the collision of the opposite two-phase flows are carried away by a gas (vapor) flow to you

plate overlaying The disadvantages of the Dash plate can also be attributed to the large resistance of the plate (P-150-280 mm water column), which is the result of a horizontal collision of opposing flows located at a distance that ensures the effective operation of the plate.

A known contact plate for mass transfer apparatus composed of separate plates angled to the direction of movement of the interacting phases and provided with inverted grooves installed between the slots of the upper and lower plates and plates attached to the lower edges of the individual plates of the upper plate parallel to the walls of the grooves. 2

However, the great difficulty in using this plate in industrial columns is to ensure a uniform distribution of the liquid film on the inclined plates, which leads to the emergence of areas where there is no contact of gas (vapor) with the incoming liquid. ItonociiiTKOM of this hareiki is also such an incomplete use of the energy of shock flows, which is spent on overcoming the forces of friction on the surface of the fluid, where the flow of the collision occurs. All this worsens the phase separation and mass transfer efficiency. The purpose of the invention is to improve the phase separation and mass transfer efficiency due to the full utilization of the energy of the shock fusion flow. This delta is achieved by the fact that the contact on the plate, consisting of individual plates arranged at an angle to the axis of the apparatus and forming gaps between two adjacent plates above which inverted grooves are installed, is provided with additional inverted grooves installed between the first grooves; the gutters are parallel to the inclined plates, the upper part of each gutter is provided with vertical rectangular tubes for gas, and the upper edges of the inclined plates are provided with vertical bars The partition walls, the lower edges of which are set at a distance from the gutters. Such a constructive arrangement contributes to a uniform distribution of the liquid film on the edges of the additional inverted troughs, which preclude cross-phase movement in the separation zone, to a more complete use of the energy of the impact merging flows. FIG. 1 shows a mass transfer plate, a cross-section; in fig. 2, - the same, in a perspective view. Plate 1 consists of separate plates 2, located at an angle to the axis of the apparatus. Above the inclined plates 2, inverted troughs 3 are installed, which play the role of the web of the saucer. For flanging up the edges 4 of the chute 3, cuts are made. Between the grooves 3, additional grooves 5 are installed, the side edges 6 of the main groove and 7 additional grooves form slots 8 for introducing fluid into the channels 9. The upper edges of the inclined plates 2 are provided with vertical partitions 10, which divide the interpeller space into the separation zones of the phase 11 and gas supply (steam) 12. Channels .9 sec are bridged along the length by vertical plates 13 forming rectangular nozzles 14 for gas. The plate works as follows. The gas is shown by dotted arrows coming from the nozzles 14 of the underlying tray 1 to the gas supply zone 12 and is directed to the channels 9, where the motor engages directly with the bone coming from the shank 8. The contacting of the liquid with gas (steam) occurs at the edges 7 of the grooves 5, limited along the length by the vertical plates 13, which ensure a uniform distribution of the liquid film. When two-phase flows exit from two opposite channels 9, their impact occurs, which additionally increases the efficiency of mass transfer. The entire flow is guided by the operation of the channel 5, which excludes the movement of the phases at the point of impact and separation, to the separation zone 11, where the flow is separated. After a collision, the gas-liquid flow moves in the separation zone towards the underlying plate 1. The gas flow, reducing its speed to a certain value and changing direction, is diverted through pipes 14 from the phase separation zone to the overlying plate. The liquid in the form of droplets, moving under the action of inertia and gravity forces, striking the surface of the liquid column, which plays the role of a hydraulic lock, remains on the lower plate. Under laboratory conditions, a plate model was manufactured and tested, which had the following parameters: Height between the plates, H, mm400 Angle of two-phase encounters. "Flow, 25 Channel length, mm 80 Width of the slit for the liquid, t, mm2 oxygen desorption from water. The liquid / gas load ratio L / G varied from 0.5 to 2.5 ,. air velocity W, referred to the total cross section of the apparatus, is 0.5-3.5. m / s. The efficiency of the plate was estimated by the efficiency of the Murfri (f) and was 0.90, for W 3.5 m / s, and L / G 1. The studies confirmed the stable operation of the plates in a wide range of load measurements at high efficiency indicators. Forms of the Invention A plate for heat and mass transfer processes consisting of individual plates arranged at an angle to the axis of the apparatus and forming slots between two adjacent plates above which inverted channels are installed, characterized in that, in order to improve the separation of the phases and the effect } 1 of the mass transfer due to the full use of the energy of the shock fusion, it is equipped with 5 additional inverted troughs installed between the first gutters, the side walls of the additional gutters are parallel to the inclined plates, the upper part of each groove is provided with vertical rectangular nozzles for gas, and the upper edges of the inclined plates are provided with vertical partitions, the lower edges of which are set at a distance from the grooves. Sources of information taken into account during the examination 1. USSR author's certificate number 565671, cl. B 01 D 3/22, 1977. 2. USSR author's certificate N 570366, cl. B 01 D 3/26, 1975.

Claims (1)

Claim 50 Plate for heat and mass transfer processes, consisting of separate plates located at an angle to the axis of the apparatus and forming gaps between two adjacent plates, over which are installed 55 inverted foreheads, characterized in that, in order to improve phase separation and mass transfer efficiency due to the full use of energy shock fusion flows she 8X9023 is equipped with additional inverted troughs installed between the first troughs, the side walls of the additional troughs are parallel to the inclined plates, the upper part of each trough is equipped with vertical rectangular gas pipes, and the upper edges of the inclined plates are equipped with vertical partitions, the lower edges of which are installed at a distance from the gutters.