EP1250532A2

EP1250532A2 - Plant building for an installation and method for operating a plant building

Info

Publication number: EP1250532A2
Application number: EP01909468A
Authority: EP
Inventors: Falko Schubert
Original assignee: Siemens AG
Current assignee: Siemens AG
Priority date: 2000-01-27
Filing date: 2001-01-15
Publication date: 2002-10-23
Anticipated expiration: 2021-01-15
Also published as: CN1395658A; KR20020086482A; EP1250532B1; CN100436838C; US20020192086A1; WO2001055560A2; RU2267581C2; WO2001055560A3; CA2398351C; DE50107830D1; MY128283A; DE10003517C2; JP4064670B2; JP2003521612A; KR100522908B1; RU2002122986A; DE10003517A1; US6805539B2; CA2398351A1

Abstract

The inventive plant building comprises a purification chamber and a pump chamber directly adjoining the purification chamber. The geometry of the pump chamber is such that disturbing swirls are avoided while the installation is in operation, due to the high speed of the coolant. The direct proximity of the two chambers to each other results in lower cost due to the elimination of the usual steadying zones.

Description

description

Operating building for a plant and method for operating an operating building

The invention relates to an operating building for a plant, in particular for a plant for generating energy, which has a pump chamber and a cleaning chamber for cooling water. The invention further relates to a method for operating the operating building.

In an industrial plant, in particular in a power plant for energy generation, cooling water is necessary for the operation of the plant. A typical example of the use of cooling water is the cooling of steam in a cooling tower of a power plant. In this case, the cooling water is generally taken from a natural reservoir, for example from a river or lake, first cleaned in the cleaning chamber in order to then be conveyed to system components via the pump chamber with a pump arranged there. In large-scale systems, the pump system delivers several cubic meters of cooling water per second. The flow paths, the cleaning devices for cleaning the cooling water, the pump chamber and in particular the pump are designed to be correspondingly voluminous. The inflow behavior of the coolant to the pump is crucial for safe and permanent, trouble-free operation of the pump. In particular, this requires a vortex-free inflow into the pump.

Due to the design, the cleaning chamber and its outlet cross section are generally very narrow and tall, whereas the pump chamber downstream of the cleaning chamber is designed to be wide and flat and is designed, for example, as a covered pump chamber. Already due to these extremely different chamber geometries and due to installations in or in the direction of flow after the Cleaning chamber experiences coolant turbulence. In order to prevent these turbulences or vortices from forming surface or floor vortices which are disruptive to the pump, a calming section is usually provided between the cleaning chamber and the pump chamber. This takes up a not inconsiderable amount of space, which has a negative impact on the costs for the construction of the company building.

In the book Lueger "Lexikon der Technik ¹ ", 4th edition; Volume 6: Lexikon der Energietechnik und Kraftmaschinen, AK, published by Rudolf von Miller, Deutsche Verlags-Anstalt GmbH, Stuttgart, 1965, pages 666-667 and pages 669-670, an operating building for a power generation plant is disclosed, the operating building having a pump chamber for arranging one

Pump for cooling water and a cleaning chamber. The company building is designed as an inlet structure on an open body of water with a number of inlet chambers so that the water flows into the individual inlet chambers evenly and as swirl-free as possible and that the bottom of the water is not whirled up or damaged by the inflowing water.

The invention is based on the object of specifying an operating building for a system and a method for operating an operating building, in which safe system operation is ensured with low manufacturing costs of the system.

To achieve the object according to the invention relating to the operating building, the latter has a pump chamber for arranging a pump for cooling water and a cleaning chamber, the pump chamber directly adjoining the cleaning chamber and having a chamber geometry such that the coolant is avoided during operation of the system of disturbing vortices has a high flow rate. The invention is based on the surprising finding that the cleaning chamber can be arranged directly in front of the pump chamber, that is, the usual calming sections can be omitted without disturbing vortices, in particular surface vortices, occurring in the pump chamber. Avoiding the eddies can namely already be achieved by an appropriate geometric configuration of the pump chamber, which leads to a comparatively high flow rate. This relationship between flow velocity and vortex formation is surprising, since it has previously been assumed that only the opposite way is promising, namely to set the lowest possible velocity to avoid eddies. The level of a sufficient flow rate depends on several factors, in particular also on the amount of the coolant to be pumped. In large industrial plants with a pumping capacity of several cubic meters per second, a flow rate of approximately 0.5 m / s has previously been provided in the calming section. In order to avoid the eddies, a higher one is set in comparison to this flow velocity, which in particular is approximately between 2-3 m / s.

The decisive advantage of this configuration is that the elimination of the calming section leads to a reduced construction volume of the company building and thus to significantly reduced manufacturing costs for the company building.

The chamber geometry is preferably designed in such a way that, during operation, the flow rate of the cooling liquid is increased when it enters the pump chamber.

In conventional systems and in the system described here, the flow rates for the cooling water within a cleaning machine arranged in the cleaning chamber are approximately 1 m / s. While conventional If this flow velocity is reduced to about 0.5 m / s by the settling sections when the inlet to the pump chamber is used, according to the present embodiment an increase in the velocity is provided in order to develop a sufficiently high flow velocity.

Preferably, an inlet opening, via which the cooling water flows into the pump chamber, is adjoined by a wall region that runs obliquely to the chamber side wall. This avoids backflow spaces in the pump chamber, which are a typical cause of the formation of vortices.

In a particularly preferred embodiment, the pump chamber is designed for positioning the pump in such a way that the displacing action of a pump tube reliably prevents the flow from detaching from the wall despite the generally large expansion angle in the inflow region of the pump chamber. This is preferably achieved in that, when the pump is installed, the flow cross section for the cooling liquid flowing into the pump chamber tapers. It is possible for the diameter of the pump tube to vary within a wide range, so that both pumps with a small tube diameter and high impeller speed and pumps with a large tube diameter and low impeller speed can be used in the same chamber. The tube diameter and the impeller speed are selected in such a way that a low so-called “required holding pressure level * (NPSH) is achieved to avoid the so-called cavitation, that is, the formation and the abrupt collapse of vapor bubbles. For this purpose, the distance between the center of the pump's axis and the rear wall of the chamber and the distance from the floor of the pump suction bell are defined as a function of the suction bell diameter and the chamber size.

To avoid wall and floor eddies and to achieve an acceptable speed profile in the pump pipe In preferred embodiments, the pump chamber alternatively and preferably in combination has the following features:

A guide threshold on the chamber floor in the region of the pump which runs approximately perpendicular to the direction of inflow of the cooling water and which is used in particular to divert the flow towards the pump;

- A longitudinal threshold arranged on the chamber floor and running approximately in the direction of the inflow direction as a flow resistance for floor vortices; - A continuation of the longitudinal threshold on the rear wall of the chamber, in particular as a vertical threshold;

- A spacing of the wall threshold from a chamber ceiling of the pump chamber, which is designed as a covered pump chamber to ensure a sufficient flow around the pump to avoid eddies;

- Similar to the inlet area, the chamber side walls merge into the rear chamber walls via inclined wall areas.

- The chamber floor is bevelled towards the chamber rear wall. - In the inlet opening to the pump chamber, in particular, longitudinal sheets running perpendicular to the chamber bottom are arranged.

- If necessary, the interior of the pump chamber is accessible from the outside via a fluidic connection, which is used for the further removal of cooling water or for measuring coolant properties. Cooling water extraction is provided, for example, for extinguishing purposes or for temporary cleaning purposes using cooling water. For this purpose, pumps are usually arranged in the pump chamber or in the calming section. However, these act as flow resistance and are often the cause of the formation of surface vortices. With the fluidic connection via the chamber wall, the arrangement of such pumps in the interior is obsolete. - When using so-called pipe housing pumps, in which the pump pipe is guided through a chamber ceiling of the pump chamber, larger or larger quantities can be additional water above the corner of the chamber. This water leaves the pump chamber through an annular gap between the pump tube and the chamber ceiling.

In addition to the special precautions in the pump chamber itself, in accordance with preferred developments, measures are also taken in the cleaning chamber to prevent eddies and to calm and compare the flow, which contribute to making the flow more even. For this purpose, the cleaning device, like the pump chamber in the inlet area to the pump chamber, has sloping side walls. Furthermore, a cleaning device is preferably arranged immediately in front of the inlet opening of the pump chamber and completely surrounds it. This cleaning device preferably has flow baffles on its side facing away from the pump chamber.

An alternative embodiment is preferably achieved by designing the pump as a concrete spiral housing pump, the concrete spiral housing forming the chamber ceiling of the pump chamber. The concrete spiral housing pump preferably has a suction pipe that projects into the pump chamber.

To achieve the object related to the method, according to the invention, the cooling water in the cleaning chamber is cleaned in an operating building with a pump chamber and a pump for cooling water arranged therein, and with a cleaning chamber directly adjacent to the pump chamber, and then flows into the pump chamber at high flow velocity, so that no vortices disturbing the operation of the pump are formed.

The advantages and preferred embodiments listed with regard to the company building can be applied analogously to the method. Exemplary embodiments of the invention are explained in more detail below with reference to the drawing. Each shows in schematic representations:

1 shows a partial sectional side view through an operating building, FIG. 2 also shows a partial sectional side view through an operating building with a concrete spiral housing pump, and FIG. 3 shows a top view of a horizontal section through a pump chamber.

According to FIGS. 1 and 2, an operating building 2 for a large-scale plant in particular, such as a power plant for generating energy, has a pump chamber 4 and a cleaning chamber 6, which adjoin one another directly via a common chamber wall 8. The cleaning chamber 6 and the pump chamber 4 are in fluid communication with one another via an inlet opening 10. The pump chamber 4 is designed as a so-called covered pump chamber and has a chamber ceiling 28. A pump 14 with a pump tube 16 is arranged in the pump chamber 4 and is spaced apart from the chamber bottom 12. This is guided through the chamber ceiling 28 to form an annular gap 29. In the pump chamber 4, a suction bell 17 is connected at the end to the pump tube 16. In contrast to the usual separate pump 14 according to FIG. 1, the pump according to FIG. 2 is designed as a concrete spiral housing pump 14a. This has a concrete spiral housing, which is formed by concrete components 19 inserted into the building structure or by the building structure itself. A suction pipe 20 with a suction bell 17 attached at the end extends from the concrete spiral housing pump 14a into the pump chamber 4, so that the suction bell 17 is at a height which is favorable for operation.

A cleaning inlet is located in the cleaning chamber 6 immediately before the inlet opening 10 and completely covers it. direction for the cooling water arranged in the form of a filter or a sieve 22. It is designed in particular as a so-called belt machine. This has a circulating sieve belt with a plurality of sieve surfaces 24, which are used in the area of the inlet opening 10 for cleaning cooling water and are cleaned in the upper area of the sieve belt machine, for example by spraying. The screening device 22 is preferably preceded by further cleaning devices, not shown.

The cooling water is usually taken from a natural reservoir, reaches the cleaning chamber 6 via an inflow opening 26, is cleaned there and then sucked in by the pump 14 through the inlet opening 10 into the pump chamber 4. The operating building 2 is arranged with respect to the water level of the reservoir in such a way that, in the event of a natural fluctuation in the water level between a high water level H and a low water level N, the suction bell 17, that is to say the inflow region of the pump 14, is sufficiently covered with cooling water. If the overlap is too low, the quality of the flow in the pump tube 16 deteriorates. This is particularly true if the water level sinks below the chamber ceiling 28. This situation is therefore only permissible for special operating cases and is permissible for a limited time, for example when the pump 14 is started, when the water is supplied to the operating building 2 through a long channel or a long pipeline. A sufficiently high coverage also helps to avoid so-called cavitation, that is, the formation and the abrupt collapse of steam bubbles with the formation of a material-damaging pressure wave. The illustrated design of the pump chamber 4 as a covered pump chamber with the chamber ceiling 28 counteracts the formation of surface vortices.

The special precautions to avoid eddies are explained below with reference to FIG 1 and FIG 3. As can be seen in FIG. 3, it extends to the inlet cυ ω) ro P ¹

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P Φ 3 tr P ι-i P P P d d • p: ro P JD: 3 P H) ro Cfl l-i cn P rt

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P 3 cn cn rt Φ CΛ CΛ o I- ¹ tr d tr CΛ φ SD SD 13 -d <! φ φ ro φ SD f ro

O p Φ cn rt ii iQ iQ PS: CΛ P Φ rt SD li 3 tr d H cn α * li PNS Φ H rt rt P rt P- Φ P ro CΛ Z -QP d P "3 Φ 3 QO CΛ cn tr PPPP SD P * z • rt SD P rt P- ^* P- cn o CΛ φ cn P Ω SD: ro P- 13 P rt d Φ ro SD 3 P Λ

P ¹ tr P- r f Φ rt tr P- P- cn P SD tr CΛ H Φ P ¹ Φ ii PHP cn w N P-

P> P- P- Φ ö P SD Φ iQ CΛ rt Φ CΛ CΛ P CΛ • _^ "» li O: • Q cn d = H tr d ro

P d Ω P- * d P * ι-i Φ ι-i 3 <! P- ro rt 3 Φ ^' P 3 tr P Φ tr

P- Hi tr • «P P- rt Hi tr Φ tr o> Q Ω ii Φ SD N d P P- d = d P * PHP Φ iQ Φ p: P iQ d P- ^* Φ iQ Ω s: o P φ w O: P- t- ¹ d P φ CΛ ds: φ Φ P- P-

Φ HP α P "ro Φ P SD: 1 Φ K Φ tr ii Φ 3 P cn 1 ^• Q Cfl ä SD P P- Φ P d P- I- * d HP> Q 1 1 Φ 1 Φ o rt φ O s: φ 13 cn 1 1 cn 1

P φ 1 P ro 1 ro P- P- P ro 1 Φ

P 1 P 00 P φ P ii

Construction height of the company building 2, so that the manufacturing costs are kept low.

Claims

claims

1.Operating building (2) for a plant, in particular for a plant for generating energy, with a pump chamber (4) for arranging a pump (14) for cooling water and with a cleaning chamber (6), the pump chamber (4) directly addressing the Cleaning chamber (6) connects and has a chamber geometry such that the coolant has a high flow rate to avoid disturbing vortices during operation of the system.

2. Building (2) according to claim 1, in which the chamber geometry is designed such that during operation the flow rate of the cooling liquid is increased when it enters the pump chamber (4).

3. Building (2) according to claim 2, in which the pump chamber (4) is connected to the cleaning chamber (6) via an inlet opening (10), which is followed by a wall region (30) which runs obliquely to the chamber side wall (32) ,

4. Building (2) according to claim 2 or 3, in which, when the pump is installed, the cooling water is displaced such that detachment of the cooling water flow from the chamber walls (30, 32) of the pump chamber (4) is avoided.

5. Building (2) according to claim 4, in which, when the pump (14) is mounted, the flow cross-section tapers for the cooling liquid flowing into the pump chamber (4).

6. Building (2) according to one of the preceding claims, in which the chamber floor (12) of the pump chamber (4) has an approximately perpendicular to the inflow direction (40) of the cooling water guide threshold (36) in the region of the pump (14) for flow diversion towards the pump (14).

7. Building (2) according to one of the preceding claims, in which the chamber floor (12) of the pump chamber (4) has an approximately in the direction of the inflow direction (40) of the cooling water extending longitudinal threshold (38) as a flow resistance for floor vortices.

8. Building (2) according to claim 7, wherein the longitudinal threshold (38) on the chamber rear wall (34) as a wall threshold (44) is continued.

9. Building (2) according to claim 8, in which the pump chamber (4) is designed as a covered pump chamber (4) with a chamber ceiling (28), and in which the wall threshold (44) is spaced from the chamber ceiling (28).

10. Building (2) according to one of the preceding claims, in which the chamber side walls (32) pass over obliquely running rear wall regions (30a) into the chamber rear wall (34).

11. Building (2) according to one of the preceding claims, in which the chamber floor (12) in the rear region of the pump chamber (4) is chamfered to the chamber wall (30a, 32, 34).

12. Building (2) according to one of the preceding claims, in which in the inlet opening (10) to the pump chamber (4) longitudinal sheets (50) are arranged.

13. Building (2) according to one of the preceding claims, in which the interior of the pump chamber (4) is accessible via a fluidic connection (56).

14. Building (2) according to one of the preceding claims, in which the pump chamber (16) has a chamber ceiling (28) through which a pump tube (16) is guided to form an annular gap (29), so that from the pump chamber (4th ) cooling water can be drawn off via the annular gap (29).

15. Building (2) according to one of the preceding claims, in which the cleaning chamber (6) in the area oriented to the pump chamber (4) has inclined side walls (52).

16. Building (2) according to one of the preceding claims, in which a cleaning device (22) is arranged in the cleaning chamber (6) immediately before the inlet opening (10) to the pump chamber (4).

17. Building (2) according to claim 16, in which a flow guide plate (54) is attached to the cleaning device (22).

18. Building (2) according to one of the preceding claims, in which the pump (14) is designed as a concrete spiral housing pump (14a), the concrete spiral housing (18) forming the chamber ceiling (28) of the pump chamber (4).

19. Building (2) according to one of the preceding claims, which is designed for a delivery rate of the order of about one to several cubic meters of cooling water per second.

20. A method for operating an operating building (2) for a plant, in particular for a power generation plant, the operating building (2) having a pump chamber (4) with a pump (14) for cooling water and one directly adjacent to the pump chamber (4) Has cleaning chamber (6), and wherein the cooling water is cleaned in the cleaning chamber (6) and then flows into the pump chamber (4) at a high flow rate, so that no vortices disturbing the operation of the pump (14) are formed.