DE1950289C3 - Heat exchanger - Google Patents

Description

The invention relates to a heat exchanger with an extendable tube bundle within an outer jacket with end floors, in which between the tube bundle and the outer jacket an independently expanding, the tube bundle enclosing protective jacket, open at both ends, is arranged; is in one of the Outer jacket loosely penetrating supply line opens.

Such heat exchangers are used, for example, in cracking systems in order to cool the resulting cracked gases. When heat is exchanged between split gases or vapors at high temperatures and high pressures, the mechanical parts of the heat exchanger that are exposed to the split gases are subject to a certain amount of wear due to thermal, chemical and mechanical stresses. Due to the high temperatures of the fission gases in connection with the possibly high pressures , the fission gases have a considerable viscosity, as a result of which they attack the parts of the heat exchanger that come into contact with them and reduce their service life.

In the case of heat exchangers of the type mentioned, the protective jacket surrounding the tube bundle: prevents AaR Hip Qnoltoace Aa from attacking the fireproof lining with which the heat exchanger is provided on the inside and thus being able to destroy the heat exchanger jacket itself. With the previously known heat exchangers of this type (see DT-PS 8 45 052), however, it is disadvantageous that the required heat exchange performance can often only be achieved by connecting two or more individual heat exchangers in series, otherwise the dimensions and thus the installation length, too Dead weight etc. of the tube bundle which can be pulled out of the heat exchanger and the freely expanding protective jacket surrounding it would lead to insoluble structural problems.

The invention is based on the object of avoiding these disadvantages and a heat exchanger

of the type mentioned to create its

Make the tube bundle and protective jacket as short as possible

and accordingly a shorter installation length b / w.

a lower dead weight than a low-performance

30 comparable heat exchangers of the known Kind.

This object is achieved according to the invention in that a tube bundle inside the outer jacket opposite second tube bundle is arranged with a protective jacket, in which a second, the Outer jacket loosely penetrating supply line opens, through which as well as through the first supply line the Fluid to be cooled flows in that a common discharge line is provided in the outer jacket, to which the fluid from the first protective jacket flows in opposite directions to the fluid from the second protective jacket and that each of the Protective jackets near the open ends by means of elastic, heat-resistant seals against the heat-insulating, brick-lined outer jacket is sealed.

This practically combines two shorter heat exchangers into one, saving otherwise Usual final floors together with refractory brickwork.

In a further embodiment of the invention, it is provided that the fluid to be heated is passed through distributor heads which are located within the closing floors, which are lined with heating. The tube sheets and hoods are located within the outer pressure jacket of the heat exchanger, so that only the differential pressure between the fluid to be heated and the fluid to be cooled has an effect.

The invention is explained in more detail below using an exemplary embodiment with reference to the drawing.

In the figure, a heat exchanger for cracked gas is shown consisting of a cylindrical outer jacket 1 made of sheet steel with end bottoms 2 and 3 'which are non-positively flanged at its free ends. The inside of the outer jacket and end floors are covered with fireproof masonry 4 made of high- alumina Schamoiteniateria! lined, within de

jacket 1 are coaxial and opposite two protective jacket pipes 5 and 5 'via sealing cords 6 and 6' clamped between their outer surfaces and the inner surface of the refractory lining, each with a feed pipe 7 or T loosely penetrating the outer jacket 1 for the supply of the from Fission furnace coming hot fission gases are connected. The supply pipe 7 or 7 'is connected to the pipe socket via a membrane

Hoc ÄiiRpnmantplc 1 above Two tube bundles 8 and 8 ', consisting of one Multiple U-shaped curved, radial guide surfaces 9

or 9 'penetrating pipes, are to each other mirror-inverted on Rohrbeden 10 or 10 'attached and with the cover plates removed 2 or 3 'axially in each protective jacket tube 5 or 5 'can be inserted and from the subsequently attached closing floors 2 or 3 ' held.

With 12 or 12 'they are the fire-proof, brick-lined exterior mania! 1 penetrating, in VericÜcrkammern

M or ΙΓ opening feed pipes for the Tube bundle 8 b / w. 8 'fluid to be heated flowing through, ζ. H. eh mixture of hydrocarbons and Water vapor, denote during 13 and 13 'the Designate the corresponding drainage pipes for this.

The hot cracked gas to be cooled is passed through the inlet tubes 7 and 7 'to the tube bundles 8 and 8', respectively Heat exchange is supplied and initially enters in the direction of the arrow along the guide surfaces and tubes opposite directions to the tube sheets 10 and 10 '. and from there in reverse R. recommendations about the geometric center of the heat exchanger, where, in the cooled state, it exits through a discharge pipe i4 located in the exterior exits the heat exchanger.

The flowing, hot and viscous cracked gas comes in this arrangement in the area of the heat exchanger with the porous refractory lining 4 no longer immediately after Kimriti but only after his Cooling in contact, causing ({damage to the Masonry should be avoided at all times. Besides that it is therefore an advantage that an otherwise common manifold for the fission gases can develop as pre-salt to the heat exchanger, since the lined outer shell I des Heat exchanger the Saiiiuielrohrbildei the same / hastily.

Here / u 1 sheet of drawings

Claims (2)

Patent claims: 1. Heat exchanger with an extendable tube bundle within an outer jacket with end floors. where between the tube bundle and the outer jacket - '. tel one that expands independently, encloses the tube bundle and is open at both ends Protective jacket is arranged, in which the outer jacket loosely penetrating to! flows into characterized in that within the outer jacket (i) a second tube bundle (8 ') opposite the tube bundle (8) also has a protective jacket (5 ') is arranged, into which a second, loosely penetrating the outer jacket Feed line (7 ') opens through which, as well as through the first feed line (7), the fluid to be cooled flows in that a common discharge line (14) is provided in the outer jacket, to which the fluid flows out the first protective sheath flows in the opposite direction to the fii-id from the second protective sheath and that each of the Protective jacket near the open ends by means of elastic, heat-resistant seals (6 and 6 ') is sealed against the heat-insulating, brick-lined outer jacket. 2. Heat exchanger according to claim 1, characterized characterized in that distribution chambers within the heat-insulating brick-lined end floors (2 and 3 ') (11 and 11 ') are arranged for the fluid to be heated.