SU1001952A1 - Mass heat exchange apparatus - Google Patents

Description

(5) MASS THERMAL EXCHANGE DEVICE

one

The invention relates to mass (heat exchangers for processes in systems) - liquid, mainly with the supply (heat) heat in the zone of contact of phases through the wall and can be used in the chemical, petrochemical, energy and other industries.

A mass transfer device is known, comprising a shell with internal overflows, a collector for heat transfer hearths and vertically installed contact pairs of plates, each of which forms a gas-fluid channel Cl.

The disadvantage of this device is its performance, which is limited by a sharp decrease in the efficiency of heat-mass transfer with an increase in the velocity of the gas in the gas-liquid channels. The latter is connected with the fact that as the gas velocity increases, the required

Removing and supplying heat 1 to the required heat-mass transfer surface) in the reaction zone, and the residence time (contact) of the phases in this zone, on the contrary, is reduced. In addition, there is a breakdown of the liquid film from the surface of the plates and a sudden increase in the overshoot: the reaction zone of the liquid phase without contact with the heat-mass transfer surface, especially the liquid, which is in the bottom of the gas stream. As a result, the effectiveness of the device in the flail falls.

The purpose of the invention is to increase productivity by eliminating

15 disruption of the liquid film from the surface of the plates.

Claims (2)

The goal is achieved by the fact that in the mass and heat exchanger,. the device including a shell with internal overflows, a manifold for heat carrier supply and vertically installed contact pairs of plates each of which forms a gas-liquid channel, according to the invention each gas-liquid channel is provided with heat-conducting elements adjacent to the surface, made in the form of inclined corrugated tapes turned one relatively other and forming screw channels. It is advisable that the heat-conducting elements be perforated. FIG. 1 shows a longitudinal section of the device; in fig. 2 is an axonometric image of two elements installed between the plates, the Mass and Heat Exchange Device includes a shell 1 with internal overflows 2 and vertically installed pairs of plates 3. The pairs of plates 3 form alternately open gas-liquid channels for interaction between the gas (vapor) fluid system and cavity 5 for the heat carrier. Channels A are provided with slopingly corrugated heat-conducting elements 6 adjacent to the plates 3, rotated relative to each other and forming spiral channels (Fig. 2). A liquid collector 7 is installed under the plates. The cavities 5 are connected by themselves and are equipped with a feed line 8 and a drainage pipe, and they have 9 branch pipes. The device works as follows. The coolant is fed through the inlet pipe 8 into the cavity 5. The gas-vapor flow enters the gas-liquid channels, trapping the fluid flowing out of the gas-liquid collector 7. The vapor-gas mixture moves in the gas-liquid channels along the helical trajectory the force of the guiding effect of the heat-conducting elements 6 (due to their shape and location). Under the action of centrifugal forces arising at the same time, the fluid, including gas flow in the borehole, is thrown against the walls of the screw channel (plates 3 and heat-conducting elements 6), and spreads over their surface in the form of an ascending film transported by g .az due to friction forces at the boundaries of the phases. In this case, heat is exchanged between the gas (vapor) -liquid mixture and the coolant due to the thermal conductivity of the plates 3 and the adjacent heat-conducting elements 6. At the outlet of the gas-liquid channels k, the liquid is separated from the vapor-gas flow and is fed to the underlying contact stage, and the released from it, the vapor-gas flow into the channels of the upper stage. The coolant, the passage through the cavities 5, transfers (receives) heat to the contact zone and then is discharged through the evacuating pipe 9 from the column. Distinctive features and their combination give the device the following new positive properties and advantages: - installed in gas-liquid. Corrugated heat-conducting elements adjacent to the surface of the channels (plates), increase the fixed surface and the intensity of heat and mass transfer, the available heat removal capacity and thus increase the efficiency and productivity of the device; - performance of elements in the form of obliquely corrugated plates (tapes) provides a rational organization of the movement of the phases, prevents the liquid phase from passing through, increases its residence time in the working area, and turbulizes the vapor (gas) - liquid phase. blend creating conditions to increase throughput; -the interposition of elements with the formation of screw channels, prevents the leakage and disruption of the liquid film from the heat exchange surface; The combination of features allows an increase in throughput throughput without reducing the efficiency of the process. The device is easy to design and manufacture. The results of calculations and experimental verification of the claimed device showed that the heat exchange surface increases by more than 2 times, while the productivity of the device increases by 20-30%. In addition, the uniform distribution of phases over the cross section of gas-liquid channels and their turbulization are improved. Claim 1. Mass transfer device including shell with internal 5100 with their overflows, the coolant supply manifold and vertically mounted contact pairs of plates, each of which forms a gas-liquid channel, characterized in that, in order to improve performance by eliminating the disruption of the liquid film from the surface of the plates, each gas-liquid channel is provided with plates adjacent to the surface heat-conducting elements made in the form of nak1952 corrugated ribbons, turned one relative to another and forming screw channels. 2. The device according to claim 1, about tl and 5 that the heat-conducting elements are made perforated. Sources of information taken into account in the examination 1. Copyright certificate USSR № 38980A, cl. B (L D 3 / 28i 1973. Te / r / ro / fffci / e 6 . 8 g  JKt // fffC / Tfu 0yf, f