CS197908B1 - Device for uniform distribution of gaseous and liquid phases in inter-tube space of heat exchanger - Google Patents

Description

BACKGROUND OF THE INVENTION The present invention relates to a device for uniformly distributing the gaseous and liquid phases throughout the cross-section between the tubular space of a heat exchanger, in particular of a wound design, with a simultaneous flow of both phases from bottom to top.

In a two-phase flow from bottom to top in the tubular space of the tube heat exchanger, it is necessary to ensure an even distribution of the liquid and gaseous phases throughout the cross-section of the heat exchanger, especially if liquid phase is lost during vaporization.

It is currently known to distribute the liquid phase by means of a tray with two hole diameters. Tubes pass through the larger holes. The gas phase passes both through the gap between the tubes and the edge of the larger openings and through the smaller openings located between the large openings. The liquid phase is fed to the tray by means of pressurized pipes, the number of which is of the order of the number of heat exchanger pipes, to ensure a uniform layer of liquid over the distributor tray. This embodiment has a number of disadvantages. The large number of transfer tubes makes it very difficult to shape and introduce the ends of the tubes into the tube sheets. If the number of transfer tubes is reduced, there is a risk of uneven distribution of the gaseous and liquid phases with respect to the decreasing layer of liquid on the palate in the direction of liquid flow. Indeed, the flow of gas phase through the orifices is inversely proportional to the height of the liquid layer. A further disadvantage of this embodiment is that the pipe openings have little clearance against the pipes. The small clearance eliminates the randomness of the pipe and thus the uneven distribution of the gas phase in the cross-section

197 908

197 908 exchanger.

These disadvantages are eliminated by the device for uniform distribution of the gaseous and liquid phases in the inter-tubular space of the heat exchanger (mainly wound) by means of a distribution tray according to the invention. The principle is that the distribution tray has narrowed cross-sectional tubes and centering protrusions in one threshment of the tray (preferably in the middle), a pressure relief tube is located and tightly connected to the tray for transferring liquid from the space below the distribution tray above that tray.

The device according to the invention is further characterized in that the tapered cross-section to 1/4 to 1/2 of the free cross-section of the sleeve is just below the upper edge of the sleeve, the upper edge of the sleeve having the same cross-section as the sleeve.

The device according to the invention is characterized by the fact that the lower part of the sleeve is provided with a skirt which overlaps the opening in the distribution floor and is pre-welded to it. cluttered hard.

The device according to the invention is further characterized in that, after the entire distribution tray has been formed with the sleeves through which the pipes are inserted, the distribution tray is sealed by pouring a soft solder layer.

The device according to the invention is further characterized in that the sleeve is made of a tube with a thickness of 0.3 to 1.5 mm from a malleable metal material by means of metal-extrusion and by pressing a tapered cross-section, centering projections (s) / flange.

Advantages of equilibrium gas and liquid phase separation devices in the inter-tube space of the heat exchanger are good gas and liquid phase distribution throughout the cross-section and substantially simpler production. The tubes of the tube bundle were pierced through the relatively large openings of the distribution tray, and then the sleeve was pushed onto the tube. After the tube has been formed behind the distributor tray and after insertion and attachment of the pipe end in the tube sheet, the sleeve is moved by the skirt to the distributor tray and moved by welding or brazing. In this way, a relatively large opening in the distribution floor is covered, whereby the centering projections of the sleeve achieve a good centering of the sleeve on the pipe. By virtue of the flow of gas through the narrowed cross-section of the sleeve, the liquid is transported in droplets to the winding, where it is transported upwards with an increased gas velocity in the built-up space. The sowing effect is so great that the inlet height exhibits very little, with the liquid being fed in a sufficiently high layer so that a practically horizontal level can be achieved when the liquid is inlet from one mill. For this reason, one, preferably central, fluid supply above the tray is sufficient. The space below the floor is therefore free for handling and exchanger tubes.

An embodiment of a device for uniformly distributing the gaseous and liquid phases in the inter-tube space of the heat exchanger is shown in the accompanying drawings, in which Fig. 1 is an axial section of the bottom part of a coiled heat exchanger; cross-section of the sleeve and insert pipe at the centering flaps.

The tubes 1, in FIG. 1, are wound on the core Z and surrounded by so-called " her shirt. The ends of the tubes 1 are fixed in the tube sheet. The entire exchanger is enclosed in a sheath 6 provided with an inlet> 7 hundred king which enters the gaseous liquid phase. The liquid phase is separated from the inlet. It is transferred to the inlet of the gas. From this space, it is forced through the overpressure tube χ and the space is not separating the cartridges. Each tube is provided with sleeves. at the bottom of the protrusion passes through the tube carrying the nozzle · χ and through the tube χ and not at the outlet of the nozzle it entrains ejectively the action of the de-winding of the tubes χ.

The nozzle χ no fig · Z is made or made of non-conforming pipe 1 * from 0 * 5 un / for pipe χ • outside 10uu / · No rock end is squeezed onto the inner hole 12 un * of the end of the mouthpiece χ remained unknown 16 ee. In two planes, the nozzle 10 is provided with the friction of the insert 11 for centering the insert pipe. At the lower end, the nozzle χ is provided with a leuen χχ · perimeter of the leuu 12 moved from below by welds 13 / pepper. by brazing / to re-leveling the tray £. In order to finish the beam, it is advisable to embed the solder 14 * with the solder 14 * before the insertion of the nozzle into the socket.

Claims (5)

OF THE INVENTION 1. Apparatus not evenly divided gaseous liquid phase in the tubular space of the heat exchanger space * first of the wound * around the differential deck * marked with a * x with a divider tray / 1 / is provided with sockets / 9 / with a cross-sectional area / 10 / / 11 / * jlalX pass pipes / 1 / protrusion * into one alstl floor / 8 / * preferably in the middle * is uelstlns and · screed / 1 / tap * connected overpressure tube / 7 / 8 / above the tet · floor / 1 /. 2. The device according to item 1 * marked with t * X · cross section (10) to 1/4 si 1/2 of the free mouthpiece cross section (9) is cramped below the play edge of the mouthpiece (9) * rung upper edge of the mouthpiece (9) at the same cross section of the nozzle / 9 /. 3. Apparatus according to item 1 * marked with * xe the lower part of the sleeve (9) is provided with a linen (12) * only * covers the opening on the resistor floor (8). pinned hard svarsn / 13 /. 4. Apparatus according to items 1 and 3 after the entire split tray (8) has been completed. The sleeves (9) are inserted through the tubes (1) and the divider tray (8) is sealed by a cast layer of low solder. 5. Equipment according to 1 * 2 o 3 * marked tln * Xe is a sleeve (9) made of tubing with a thickness of 0 * 3 sX 1 * 5 ee made of ductile metal material by metal-plating · pressing · remaining cross-section / 10 / * centering projections / vls / / 11/1 teau / 12 /.