DE7809692U1 - HEAT EXCHANGER FOR INCINERATION PLANTS - Google Patents

Description

MTH Apparatebau Meißner GmbH Fabrication for heat exchangers Nickenicher Str. 10 5473 Kruft

Heat exchangers for incinerators

The invention relates to a heat exchanger for incineration plants with an inner pipe designed as an exhaust pipe, one surrounding the inner pipe at a distance Outer pipe, which with the inner pipe forms an annular gap intended for water flow, a the bottom and cover closing the annular gap at its ends, as well as an inlet and outlet nozzle for the annular gap.

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Various heat exchangers are already known, with those of the loss of energy and heating costs in incineration plants, e.g. B. central heating systems, decreased shall be. What these heat exchangers have in common is that they are part of the exhaust or flue gas line are to be installed and have a jacket for guiding and heating water, which is returned to the Heating circuit arrives.

In a known heat exchanger of the type mentioned at the outset, the inner tube arranged concentrically to the outer tube in the level has a smooth surface. In order to arrive in this embodiment to a satisfactory V.'ärmeaustausch, the heat exchanger must be formed relatively long.

In practice, however, the exhaust or flue gas lines from \ ^; incineration plants do not have any corresponding sections in which such a heat exchanger could be installed as a part of the same. Or only shortened versions can be used, which, however, do not yet allow a fully satisfactory exchange of heat exchanges and are therefore not particularly economical in terms of their manufacturing and assembly costs.

The request has also already been made Heat exchange by installing further exhaust pipes of relatively small diameter in the water-bearing ones To improve the jacket, with these exhaust pipes being connected at the end to the inner pipe and form an additional path for the exhaust gas The disadvantage of this embodiment is that it is too leads to relatively large outer diameters, in addition to which, overall, it is quite complex and accordingly expensive is.

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This is where the invention comes in. It is based on the task of creating a heat exchanger of the type mentioned at the beginning Kind of training so that this with a compact design, above all, what its overall height, but also what its outer diameter concerns, a satisfactory heat exchange is still permitted. At the same time, the heat exchanger should be relatively simple and clear and inexpensive to manufacture.

Surprisingly enough, these diverse requirements are sufficient a heat exchanger in that, according to the invention, the inner tube is provided with elevations or depressions is.

The elevations or depressions can either be on the finished bent and welded inner tube a subsequent embossing pre-anc can be attached or already in the case of the sheet-like starting material be realized.

This simple measure improves the heat exchange between the exhaust gas and the heating water in the long term. To the On the one hand, the effective surface of the inner tube is increased, and on the other hand, it increases the heat transfer more favorable flow guidance achieved.

As a result, with an inventive Heat exchangers achieve the desired degrees of efficiency, especially with a lower overall height. Was for example otherwise a heat exchanger with a height of around 100 cm for a given external diameter is sufficient now a heat exchanger with a height of only 60 - 70 cm.

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The depressions are advantageously designed as longitudinal grooves .

The depressions expediently taper towards the longitudinal axis of the inner tube.

According to a further proposal, the recesses give the inner tube an approximately star-shaped overall Cross-section.

Further details are described below with reference to the drawing for a preferred embodiment. Show in it:

Figure 1 shows a heat exchanger in the installed state in a schematic side view and

Figure 2 shows the object of Figure 1 in an enlarged sectional view along the Line II-II.

According to Figure 1, a heat exchanger according to the invention an inner pipe 2 and an outer pipe 3 surrounding the inner pipe 2 at a distance. The inner tube 2 and the Outer tubes 3 are arranged concentrically to one another and form an annular gap 4.

The annular gap 4 has a bottom 5 at its ends or a cover 6 closed. An inlet connection 7 is located near the bottom 5 and an output connection is located near the cover 6 8 attached to the outer tube 3 for the annular gap 4.

As can be seen, the heat exchanger 1 forms a section of an exhaust gas or flue gas line 9 between a

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combustion system, namely a boiler 10 of a central heating system, and a chimney 11. In addition the inner pipe 2 is designed as an exhaust pipe with an inner diameter adapted to the rest of the exhaust pipe 9.

The inner tube 2 has a water-bearing jacket in the form of the annular gap, in which water under Extensive use of the sensible residual heat of the exhaust gas when it cools down to below 200 ° C is heated. From there the heated Kasser is the heating circuit of the boiler 10 or the central heating system fed back.

For this purpose, the outlet connection 8 is connected to the heating circuit of the boiler 10 via a return line 12 connected. In addition, the boiler has a return line 13, which via a valve 14 with the inlet connection 7 of the heat exchanger 1 is connected or connectable. This allows the heat exchanger 1 switch on the heating circuit of the boiler 10 if necessary. The boiler 10 leaves the heated water via a feed line 15.

According to the invention the inner tube 2 is provided with elevations and depressions 16, which have an increase in the effective surface area and improve the flow conditions in the sense of a better heat transfer result.

As can be seen in particular in FIG. 2, there are indentations 16 designed as Läagsrillen that taper towards the longitudinal axis of the inner tube 2 and the Inner tube 2 has an approximately star-shaped transverse

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cut \ ^r borrow. Such an inner tube is relatively easy to manufacture and allows good heat exchange between exhaust gas and water with a compact design, in particular a relatively low overall height. The heat exchanger 1 shown is equally suitable for vertical as well as horizontal or any inclined installation.

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Reference character list

1 Heat exchanger 2 Inner tube 3 Outer tube 4th Annular gap 5 floor 6th lid 7th Inlet connection 8th Outlet port Q Exhaust pipe 10 boiler 11th chimney 12th Return line 13th Return line 14th Valve 15th Supply line 16 Elevation, deepening

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Claims (4)

MTH Apparatebau Meißner GmbH Fabrication for heat exchangers Nickenicher Str. 10 54 73 Kruft heat exchangers for incineration plants 1. Heat exchangers for incinerators with a designed as an exhaust pipe inner pipe, an outer pipe surrounding the inner pipe at a distance, which with de? "inner pipe forms an annular gap intended for water flow, one of which forms an annular gap its ends closing bottom and lid and an input and output nozzle for the Annular gap, characterized in that the inner tube C 2) with elevations or depressions (16) is provided. 2. Heat exchanger according to claim 1, characterized in that the recesses (16) as longitudinal grooves are trained. 3. Heat exchanger according to claims 1 and 2, characterized in that the depressions (16) taper towards the longitudinal axis of the inner tube C 2). 4. Heat exchanger according to claim 3, characterized in that the depressions (16) as a whole are the inner tube C 2) give an approximately star-shaped cross-section. 7809692 09/07/78