AU2006251721B2

AU2006251721B2 - Condensing system

Info

Publication number: AU2006251721B2
Application number: AU2006251721A
Authority: AU
Inventors: Heinrich Schulze
Original assignee: GEA Energietchnik GmbH
Current assignee: GEA Energietchnik GmbH
Priority date: 2005-05-23
Filing date: 2006-05-22
Publication date: 2008-10-30
Anticipated expiration: 2026-05-22
Also published as: EP1886084B1; ATE404837T1; CN101091098A; TNSN07344A1; AP2007004006A0; MX2007005843A; MA29230B1; DE102005024155B4; DE502006001347D1; AU2006251721A1; US20080196435A1; RU2347995C1; WO2006125420A1; DE102005024155A1; ZA200710041B; CN100580361C; ES2309965T3; EP1886084A1

Description

00

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Condensing system O The invention relates to condensing systems.

Occasionally considerable circulation of warm air particularly in the case of larger _units of power plants and buildings in the immediate vicinity of air-cooled (-i condensing systems can be expected when the wind conditions are unfavourable. The circulation of warm air takes place in limited areas, in particular (-i IN 10 in the corner areas of a condensing system. The nearest possible solution would Sbe to increase the height of the wind shield walls surrounding the heat (-i exchanging elements. Basically it would be necessary only in critical areas. Cost, the static of the condensing system as well as environmental conditions and changing intensities of the warm air circulation are against this solution and demand less costly and more effective measures to reduce the warm air circulation even temporarily, i.e. only when the actual problem is present.

To reduce the warm air circulation DE 34 21 200 Al proposes a forcibly ventilated condensing system with an aerodynamic wall. The flow velocity of the aerodynamic wall should be greater than the exit velocity of the cooling air from the heat exchanger elements. In this conjunction the easy-to-build wind shield walls are omitted and instead of them a relatively large-volume nozzle system is proposed, wherein the nozzles can be arranged above or laterally from the heat exchanger elements. Specially constructed slot nozzles are also conceivable, which are provided on the edge of the condensing system and can be charged with cold as well as warm air.

Because the problem of the warm air circulation depends greatly on the direction of the prevailing wind and the local wind velocities, a barrier, constructed exclusively as an aerodynamic wall, represents a high cost relating to the apparatus, that is not absolutely necessary in all edge regions of a condensing system. Even when in principle it is possible to provide a portion of the edge region of the condensing system with an aerodynamic wall, due to the change in 2 0 the wind conditions it is difficult to foresee whether other sections of the edge

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0region are not subjected temporarily to increased circulation of the warm air. A

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fast changeover in such a case is not possible. As a precaution the entire edge O region should be furnished with an aerodynamic wall, what due to cost considerations is not sensible.

Based on this, an object of an aspect of an embodiment of the present invention is to provide a condensing system with an aerodynamic wall that, when necessary, (can be connected at least to some areas without great constructive changes.

i The discussion of documents, acts, materials, devices, articles and the like is included in this specification solely for the purpose of providing a context for the present invention. It is not suggested or represented that any or all of these matters formed part of the prior art base or were common general knowledge in the field relevant to the present invention as it existed before the priority date of each claim of this application.

The present invention provides a condensing system with a plurality of particularly roof-shaped heat exchanger elements, to which cooling air is conveyed by means of fans, wherein an aerodynamic wall is formed on an edge of the condensing system, wherein on the edge a wind shield wall constructed from plate elements is provided, wherein the plate elements have a plurality of hollow chambers extending upwards, wherein an air stream to produce an aerodynamic wall above the wind shield wall can be introduced at least into some regions of the wind shield wall constructed in this manner.

A condensing system according to an embodiment the present invention has on its edge a wind shield wall constructed from plate elements, wherein the plate elements have a plurality of hollow chambers extending upwards. The hollow chambers of this wind shield wall are used for the forming of an air stream to produce an aerodynamic wall above the wind shield wall. An advantage of the condensing system according to this embodiment of the present invention is that no additional slot nozzles or expensive nozzle shafts need to be installed, because the wind shield wall, present in any case, is used for the construction of an aerodynamic wall.

00 O The air stream introduced is in particular a cold air stream, that blends with the heated cooling air and reduces the negative effect of the remaining warm air O circulation by virtue of the blending alone. At suitable air stream velocities numeric examinations resulted in a marked reduction of the local warm air circulation by several percent. This may lead to an improvement of the capacity of the condensing system and thus to an increase of the efficiency of the power station. The conveying of the accelerated air stream may be carried out with a Sseparate, for example a mobile fan, or also by shunting a partial stream from the

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fans conveying the cooling air, said fans allocated to the heat exchanger elements N positioned on the edge. Although due to the relatively small cross-section of the hollow chambers a pressure drop may occur the conveying capacity of the fans is very great, so that the volume of the stream in the region of the aerodynamic wall is relatively great and compensates for the pressure drop. By using the existing wind shield walls a temporary as well as a permanent flexible and at the same time effective solution may be achieved to reduce the circulation of the warm air with relatively limited technical effort and at a low cost.

The invention is explained in detail in the following based on the embodiments illustrated in the drawings. They show in: Fig.1 is a side view of a condensing system according to an embodiment of the present invention with a plurality of roof-shaped heat exchanger elements provided in a row, which are positioned between wind shield walls on the edge, Fig.2 is a top view on the condensing system, of Fig.l, Fig.3 is a side view of a heat exchange element adjacent to a wind shield wall on the edge, Fig.4 is a side view of a further embodiment according to the illustration of Fig.3, and 00 O Fig.5 is a cross-section view through a wind shield wall as it is used in Figs.4 and 0 Figs.1 and 2 show a condensing system 1 with a plurality of heat exchanger elements 2 arranged in a row, to which cooling air K is introduced via fans 3. Due to this the steam, introduced via a steam distribution line 4, will condense within the heat exchanger elements 2. The heat exchanger elements 2 are surrounded Saltogether by a wind shield wall 6 provided on the edge 5 of the condensing

INO

system 1, said wind shield wall preventing an immediate and unhindered N circulation of the warm air. The degree of warm air circulation very strongly depends on the locally prevailing wind direction. A too strong a circulation of the warm air can take place in particular in the corner region of a condensing system, having a negative influence on the condensing capacity and thus the efficiency of the power station. Within the scope of the invention provision is made that above the wind shield wall 6 an aerodynamic wall 7 is constructed, that represents an additional barrier between the warm air W streaming out of the heat exchanger elements 2 and the cooling air K drawn in from below. In the form of an example Fig.1 shows that such an aerodynamic wall 7 is constructed only in the region of that wind shield wall 6 which is on the left in the plane of the drawing.

Corresponding edge sections 8 of an aerodynamic wall 7 are also shown in the form of an example in the top view of Fig.2. As a rule, such an aerodynamic wall is only locally required, particularly when very definite wind conditions prevail.

Decisive is that the aerodynamic wall 7 can be constructed at any edge section 8 without the necessity of fundamental constructional changes in the condensing system.

The air stream L necessary for the construction of an aerodynamic wall 7 is guided through hollow chambers 9 of the wind shield wall 6. In this embodiment the hollow chambers 9 have a trapezoidal shape (Fig.5). The wind shield walls 6 may be erected from self-supporting plate elements that have, for example, a trapezoidal or corrugated shape. Fig.5 shows an example, wherein a central plate element 10 with trapezoidal hollow chambers 9 is enclosed on both sides by flat plate elements 11, 12, so that they form the required hollow chambers 9.

Figs.3 and 4 show how the air stream L is introduced into the hollow chambers 9.

Fig.3 shows that in the region of the lower edge region of the wind shield wall 6 an adjusting flap 13 is provided, that shunts a partial air stream L1 off the cooling air stream K. The adjusting flaps 13 can be opened and shut as required. In addition to the adjusting flaps 13 or also optionally the air stream L can be produced at least partly by using additional fans 14. The embodiment according to Fig.4 shows that the air stream L is made up from the partial air streams L1 and L2, which are produced by the additional fan 14 or the fan 3.

List of reference numerals 1 Condensing system 2 Heat exchanger element 3 Fan 4 Steam distribution line Edge of 1 6 Wind shield wall 7 Aerodynamic wall 8 Edge section of 9 Hollow chamber Central plate element 11 Cover plate 12 Cover plate 13 Adjusting flap 14 Additional fan K Cooling air L Air stream L1 Partial stream L2 Partial stream W Warm air

Claims

2. A condensing system according to claim 1, wherein the plate elements have a trapezoidal or corrugated configuration and are enclosed on one or both sides by cover plates to form hollow chambers.
3. A condensing system according to claim 1 or 2, wherein the air stream for the aerodynamic wall is at least proportionally a partial air stream of the fans on the edges.
4. A condensing system according to claim 3, wherein the air stream is a partial air stream of the not yet heated cooling air. A condensing system according to claim 3 or 4, wherein the partial air stream can be adjusted by adjusting flaps provided in the cooling air stream.
6. A condensing system according to any one of claims 1 to 5, wherein the air stream is produced at least proportionally by additional fans.
7. A condensing system substantially as hereinbefore described with reference to the accompanying drawings.