DE2733590A1 - Cylindrical shell heat exchanger with cylindrical core - uses strips with longitudinal corrugations placed shells forming flow paths - Google Patents

Abstract

The cylindrical shell heat exchanger has a central tubular core. Heat exchange between fluids take splace across the core tube walls. On the core tube is placed corrugated strip covered by enveloping shell. High heat exchange efficiency is ensured together with low pressure drops. Within the core tube is placed concentrically a smooth walled inside tube of small diameter for forming a flow channel for one fluid. On the inside walls of this smooth inner tube is placed another corrugated strip. This forms a second channel. The shell is split axially and both sections are connected by flanges to each other so that they can be dismantled.

Description

Tubular heat exchanger

The invention relates to a tubular heat exchanger as a heat exchange surface between the heat emitting and the heat absorbing Medium serving core tube and one arranged on the outer surface of the core tube Weil band, which was used to form a flow channel outside through a jacket pipe is covered.

Tubular heat exchangers of the type described above are known. The corrugated tape arranged on the outer surface of the core tube is helical or in rings arranged next to one another with the formation of loops on the core tube wound up and connected to this, for example by soldering or welding. The loops of the corrugated tape lying one behind the other in the direction of flow can be offset or aligned with one another.

The invention is based on the object of a tubular heat exchanger to create the type described above, which has a low pressure loss has high efficiency for heat transfer and with a simple construction and thus easier production and assembly from inexpensive material with little Build volume can be produced.

The solution to this problem by the invention is thereby characterized in that a smooth-walled inner tube concentrically within the core tube with a smaller diameter to form a flow channel with a circular ring Channel cross-section for the one medium is arranged and that on the inside of this smooth-walled Inner tube a further corrugated tape is arranged, which to form a second, in the direction of flow parallel to the channel formed by the core tube and jacket tube arranged channel with also circular cross-section on a cylindrical Flow body is applied, uer is arranged coaxially to the tubes.

With this proposal of the invention, a tubular heat exchanger created, in which the heat exchange not only on a cylindrical exchange surface, namely the core that takes place raw, but / an additional heat exchange surface possesses, unc between a second smooth-walled tube and a ì cross-section circular channel filled with a single corrugated tape on a smaller one Diameter is formed inside the core tube. This gives me two parallel mutually lying, each in cross-section circular flow channels for the preferably gaseous medium, which is also the annular channel for the preferably liquid medium surrounded on both sides and in this way approximately double the heat exchange surface.

Here, a simple construction is maintained, so that the invention tubular heat exchanger made of inexpensive material and manufactured in a simple manner and can be assembled. The heat exchanger according to the invention is both upright can also be used lying down and has the advantage that it can be stored in a simple manner cz. can be hung up, as its individual parts change when the temperature changes can expand in all directions.

According to a further feature of the invention, the jacket tube is at least divided axially once and the two sections can be dismantled by means of flanges connected with each other.

This allows the heat exchanger according to the invention to be simple way can be dismantled for cleaning purposes because of the low number of Otherwise easily accessible welded or soldered connections is the risk of leaks extremely small, so that the tubular heat exchanger of the invention is high overall Service life achieved with cheap maintenance and repair costs the possibility of both the gas flow and the also to divide the liquid stream into several partial streams, whereby the interior of the heat exchanger is better used.

In the drawing, there are two exemplary embodiments of the invention Heat exchanger shown, namely show: Fig. 1 is a longitudinal section through a first embodiment of the heat exchanger, FIG. 2 shows a cross section according to FIG Section line II-II in FIG. 1, FIG. 3 shows a longitudinal section through a second exemplary embodiment of the heat exchanger and FIG. 4 shows a cross section according to the section line II-II in Fig.

The heat exchanger arranged vertically in the first exemplary embodiment has a jacket tube 1, which is divided into a lower section la and an upper section lb is divided axially. Each section la and lb has an annular flange 2a or

2b, through which the sections la and lb can be dismantled with one another Following a conical diameter reduction in the end area of the jacket pipe 1 is each section la or lb with an end flange 3 or 4 Mistake.

By means of these end flanges 3 and 4, the tubular heat exchanger be installed in a pipeline.

A core tube 5 is arranged concentrically within the jacket tube 1, which Is provided helically or in a ring with an outer corrugated tape 6. Inside This core tube 5 is also concentrically an inner tube 7 'which is a smaller one Has diameter and provided on its InDZnfläche with an inner corrugated tape 8 This corrugated strip 8 surrounds a cylindrical flow body 9, which is concentric to the three tubes mentioned above and arranged on its end faces with each has a displacement cone 9a and 9b.

Due to the structure described above, in the heat exchanger formed two gas channels KG, which are flowed through in parallel by gas G, the The illustrated embodiment is fed to the heat exchanger from above, as the drawn arrows clarify. Both gas channels KG have corrugated tape 6 or 8 filled in, with the outer gas channel between casing tube 1 and core tube 5 and the inner gas channel between inner tube 7 and flow body 9 is formed.

The core tube 5 and the inner tube 7 continue to form between them a liquid channel KF 'in the illustrated embodiment of a Fluid F is flowing through. In the embodiment shown, the liquid gets into it F through an inflow connection loa into the liquid channel KF; it becomes this fluid channel s praise withdrawn through a drain nozzle. While in the illustrated embodiment the inflow nozzle loa and the outflow nozzle lob are arranged side by side, which is why a subdivision of the liquid channel in the longitudinal direction of the heat exchanger is required, there is of course also the possibility of the liquid F helically through appropriate dividing plates or pipes within the liquid channel To lead KF.

The heat exchange between the, for example, hot gas G and the heat-absorbing liquid F occurs on the entire cylindrical surface both of the core tube 5 and the inner tube 7, the heat transfer through the Corrugated tapes 6 and 8 is improved. About heat transfer between the corrugated tape 6 and the jacket tube 1 and between the corrugated tape 8 and the flow body 9 to reduce a minimum, is in each case between the corrugated tape 6 or 8 and the jacket pipe 1 or flow body 9 formed a gap. The one taking place through conduction In this way, heat transfer is essentially due to the conduction of heat between the corrugated tape 6 and the core tube 5 or between the corrugated tape 8 and the inner tube 7 limited.

In the second embodiment according to Figures 3 and 4 are for components that correspond to those of the first exemplary embodiment, identical reference numerals are used been. This second version differs from the first in that instead of a core tube 5 and an inner tube 7 are now two core tubes 5 and two inner tubes 7 are used, creating additional flow channels, lit heat-exchanging surfaces for better utilization of the available space. It thus arises a division of the liquid flow into two liquid channels KF and one Distribution of the gas flow into a total of three gas channels KG.

Of course, in this embodiment too, the additional Ken tube 5 and inner tube 7 are each assigned a corrugated tape 6 and 8, respectively.

Claims (4)

Claims: 1. Tubular heat exchanger with a heat exchange surface between the heat-emitting and the heat-absorbing medium serving core tube and a corrugated tape disposed on the outer surface of the core tube, which is used to form of a flow channel is covered on the outside by a jacket tube, d u r c h g e k e n n n n e i c h n e t that within the core tube (5) concentrically a smooth-walled Inner tube (7) with a smaller diameter to form a flow channel with a circular ring Channel cross-section for the one indium is arranged and that on the inside of this smooth-walled inner tube (7) a further corrugated tape (8) is arranged, which for Formation of a second in the direction of flow parallel to that through the core tube (5) and Jacket tube (1) formed channel arranged channel with also circular ring-shaped Cross-section of a cylindrical flow body (9) rests coaxially to the Pipes (1,5,7) is arranged. 2. Tubular heat exchanger according to claim 1, characterized in that the jacket tube (1) is axially divided at least once and the two sections (la, lb) are detachably connected to one another by means of flanges (2a, 2b). 9. Tubular heat exchanger according to claim 1 and / or 2, characterized in that between the outer corrugated tape (6) and the jacket tube (1) and between the inner one Corrugated tape (8) and the flow body (9) a gap is formed. 4. Tubular heat exchanger according to claim 1, characterized in that by arranging further core tubes (5) or Inner tubes (7) with applied corrugated tape (6, 8) additional flow channels are formed with heat-exchanging surfaces.