DE2127303A1 - Heat exchange boiler - Google Patents

Description

The invention relates to heat exchange boilers and, more particularly, to the type of heat exchange boilers which comprise an elongated removable tube bundle or set of tubes extending within a chamber; through which a heat transfer fluid is passed, wherein the tubes collectively receive another heat exchange fluid and, after the heat exchange, release it through an end wall of the chamber formed by a detachable tube plate to which the tubes are connected.

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Heat exchangers of this type can have considerable dimensions and one possible application is the cooling of ethylene, which may be later than you To serve coolant. In this way, ethylene can be sent through the tube bundle or the tube set and through heat exchange be cooled with liquid propylene, which is continuously fed to the chamber and into which the tube bundle or the tube set is submerged. The liquid propylene boils inside the chamber and is continuously withdrawn as vapor.

An important requirement for any design of heat exchangers of this type is that the numerous different Parts that form the overall heat exchanger should be connected to one another so that a secure seal is ensured between the contact surfaces to which the heat exchange fluids have access. Earlier types of construction possessed essentially three main parts; these were initially a tube plate that was welded to the tubes is and through which the end portions of the numerous tubes pass in a special division such that the Tube inlets and the tube outlets are collectively grouped; second, a generally domed arched one End part of the exchanger, which against the peripheral sections of the the free end face of the tubular plate is clamped and, with appropriate internal subdivision, together with the tubular plate

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works so that he has distribution and receiving chambers for one supplies the first heat exchange fluid, i.e. for ethylene and, thirdly, a jacket or shell which surrounds the tubes and which has inlet and outlet means for a second Heat exchange fluid is provided, this dumbbell also being clamped against the peripheral portions of the tubular plate, but on the opposite side of the dome-shaped end part. In this setup there are two main areas where leakage losses can occur; these areas are between the tube plate and the jacket as well as between the tube plate and the dome-shaped end portion; to ensure an effective seal between these two areas seals are fitted and the parts are clamped together.

It has been found that such training is entirely satisfactory, but causes considerable inconvenience, as it is when exchanging the between the tube plate and the ™ Sheath located seal is necessary, the tube bundle completely out of the jacket in order to insert a new seal. The tube bundle and the associated Tubular plates are bulky and heavy and, moreover, are not very robust, and moreover Sufficient space behind or next to the heat exchanger without fittings or other fixed parts or other obstacles

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Nits must be left, which means a lot in the design the system is limited.

The object of the invention is to provide a different structure for to provide a heat exchanger which is equivalent in performance and does not suffer from the need to use the tube bundle having to pull out when seals are to be replaced.

The invention thus provides a heat exchanger of the prescribed type in which the tubular plate on its outer or "free" face attached to an end portion of the exchanger via an intermediate sealing ring which, with the tube plate, provides distribution and receiving chambers for the heat exchange fluid passing through the tube bundle goes, and also on this end face with the interposition of a sealing ring on an annular structural part surrounding the end portion of the exchanger, the adjacent end portion of the shell of the heat exchanger the tubular plate overlaps and surrounds and with the interposition of a sealing ring on edge portions of the is attached annular structural part which extends radially beyond the edges of the tube plate.

It can be seen that with this construction, all seals can be easily removed with the end portion of the heat exchanger and the

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ring-shaped construction part are accessible; there is none Need to remove the tube plate and tube bundle from their position within the shell.

The end part of the heat exchanger, which provides for the supply and withdrawal of heat exchange fluid to the tubes, is advantageous detachable from the tubular plate without the annular structural part having to be removed. The end section of the The jacket can surround the tubular plate with a small gap and ™ the tubular plate can be received in an annular recess provided in the end portion of the shell is.

Advantageously be provided, opposed portions of the tube plate and an annular structural part and end part of the heat exchanger where seals are used, with corresponding flat recesses and protrusions in order to promote good gasket seal, WO M accommodate the seals in the grooves.

The annular structural part and the end part of the heat exchanger can each be fastened satisfactorily to the tube plate by means of stud bolts which are screwed into the tube plate and which are provided at their free outer ends with tightenable clamping nuts. The ring-shaped

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The structural part is expediently connected to the end of the jacket by bolts to the end flange of the jacket.

The terms "annular" and "radial" as used in the specification are not intended to be limiting on circular design of the parts described. In practice, the dumbbell will undoubtedly have a circular cross-section and it will be circular cylindrical the greater part of its length. In the same way, the Tube plate, the annular structural member and the end portion of the heat exchanger can also be round; Of course however, these parts can have a different shape, for example oval, elliptical, elongated or square Have shape without preventing the placement of accessible seals. The term "annular" is intended to mean only one indicate continuous closed form, while "radial" the outward dimension compared to the general Designate the direction of expansion and the position of the tube bundle target.

The invention is explained in more detail below with reference to schematic drawings of an exemplary embodiment.

Figure 1 is a side view of the part according to the invention the heat exchanger;

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Figure 2 is an end view of the portion of the heat exchanger of Figure 1;

FIG. 3 is an enlarged cross-sectional view in the plane of FIG. 1 of the part of the heat exchanger according to the invention and shows in particular the tube plate _? the end portion of the shell, some of the end part of the exchanger and the ring seals.

According to Figures % and 2, the heat exchanger Λ has a main shell body or main shell body 1 (only part of its length is shown), a dome-shaped end part 2 and a clamping ring 3. The shell 1 is essentially circular, as far as its section 1 a is concerned, wherein the jacket is asymmetrically tapered at one end to a considerably smaller diameter. The conically tapered section is denoted by the reference symbol 1 b in FIGS. 1 and 2. The end portion of the jacket 1 c carries a flange 1 d to which the ring 3 is fastened by bolts at closely spaced locations. The dash-dotted lines A - A in Figure 1 show typical arrangements for bolts.

The ring 3 surrounds the dome-shaped end part 2 with a uniform radial spacing and does not interfere with the removal of the dome-shaped End part 2.

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The jacket 1 is with inlets 4 (only two are shown) and Outlet 5 (only one shown) for a heat exchange fluid provided at spaced locations along its length, while the dome-shaped end portion 2 has an inlet 6 and an outlet 7 for another heat exchange fluid.

The dome-shaped end part is divided in the interior to create distribution and receiving chambers for its heat exchange fluid to deliver. When the heat exchanger is assembled, the distribution and receiving chambers are interconnected by numerous folded or bent, i.e. elongated U-shaped heat exchange tubes in connection (in Figures 1 and 2 not shown), collectively with parallel exiting and entering sections along substantially the whole Extend the length of the jacket 1 and occupy the lower part of the interior of the Itantel. These tubes, which are conveniently called "U-tubes" are designated, they extend through a tubular plate, which is shown in dashed lines in FIG. 1 and is denoted by the reference numeral 8. The tube end sections are attached to the Tubular plate 8 welded on. The connections are "soft connections" that allow movement under thermal stress. (For example, there can be a temperature difference of almost 200 ° C between different parts of the tube plate, if the heat exchanger for ethylene / propylene worm exchange has a "double pass" tube bundle flow arrangement

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is used, in which the ethylene through two groups of U-tubes flows in series). The heat exchanger is supported as a whole on a trough 9 (see FIG. 2).

FIG. 3 shows a typical bolt connection between the ring 3 and the flanged end section 1 d of the jacket 1 shown. The flanged end portion 1 d of the shell 1 takes the tube plate 8 within a recess 11 with tightly fitted Dimensions, wherein at 12, leaving a small gap, the tube plate 8 and the jacket 1 close together opposite.

The ring 3 is in numerous places on the tube plate by means of stud bolts 13 (only one is shown) attached, which are screwed into the tube plate 8. The dome-shaped end part 2 of the exchanger is in the same way on the tube plate 8 with the help of stud bolts 14 (only one is shown) attached. ™

Two representative heat exchange tubes of the tube bundle are shown at 15 passing through the tube plate 8 hi ^ step through.

Between the ring 3 and the jacket flange 1 d, the ring and the tubular plate 8 and the dome-shaped end part 2 and the

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Tube plate 8, ring seals are provided. The positions of these ring seals are indicated in FIG. 3 by arrows 16, 17 and 18 indicated; the surface areas of the jacket flange 1 d, of the ring 3, the tubular plate 8 and the dome-shaped end part 2, between which the seals are enclosed are spatially assigned depressions e, f (in fact a depression with only one side) and g and provided with projections or "ribs" h, i and j, the sealing rings in the Wells are included. The arrangement of these "ribs" and depressions ensures an effective seal between the clamped parts.

As can be seen in particular from Figures 1 and 3, these ring seals are for the requirements of the heat exchanger correctly and by removing the ring 3 and the dome-shaped End part 2 easily accessible. The tube plate 8 and the tube bundle remain during the seal exchange in place. Machining facilities for on-site machining can be used to cut the indentations 8 e, 8 f and 8 g to be renewed.

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Claims (3)

Claims / 1.) Heat exchange vessel comprising an elongated removable bundle or set of tubes running within a chamber through which a heat exchange fluid is passed, the tubes collectively receiving another heat exchange medium and releasing it after the heat exchange through one of the chamber limiting end wall, ™ which is formed by a detachable tube plate to which the tubes are connected, characterized in that the tube plate (8) is attached at its outer free end face with the interposition of a seal to an end part (1 d) of the heat exchanger which is connected to the tube plate forms distribution and receiving chambers for the heat exchange fluid that goes through the tube bundle (15), as well as on this end face with the interposition of a seal on an annular ι structural part (3) which surrounds the end section of the heat exchanger M , the adjacent end section (1 d ) of the shell of the heat exchanger the Rö Hrenplatte protrudes beyond and surrounds this and is connected with the interposition of a seal to the circumferential sections of the annular structural part (3) which extends radially outwardly beyond the edges of the tubular plate (8). 1 09851/1139 2. Heat exchanger according to claim 1, characterized in that the end part (ld) of the heat exchanger for provides the supply and removal of the heat exchange fluid to the tubes, is detachable from the tube plate (8) without the annular structural part (3) can also be removed got to. 3. Heat exchanger according to claim 1, characterized in that the tubular plate (8) of an annular recess (11) is received in the end section (1 d) of the jacket (1). 10 9 8 5 1/113 9 Blank page