DE3211142C2 - Screening device for the cooling water flow of a tubular heat exchanger, in particular a power plant heat exchanger - Google Patents

Abstract

Sieve device for separating cleaning bodies from the cooling water behind a tubular heat exchanger, especially a power plant heat exchanger. The basic structure includes a substantially cylindrical housing through which the flow of cooling water flows, at least two separating screens arranged therein, each pivotable about a horizontal axis, and a collector box that is open at the top. The separating sieves can be swiveled into a sieve position and a cleaning position. The collector box has in the area of its upper edge at least one Turbu lenz generator in the form of a built-in body with one or more tear-off edges, which extends parallel to the pivot axes of the separating screens. The turbulence generator can be adjusted around its axis between a turbulence-generating flushing position and a flow-around position. In the rinsing position, the collector box is rinsed and cleaning bodies stuck there can be recovered.

Description

an adjustable flushing flap in the sieve device is arranged which is pivotable about an axis orthogonal to the axial direction of the housing and closes the free sieve space in the flushing position except for an edge area, characterized in that that for the purpose of use as a device for separating cleaning bodies (1) from the cooling water flow (2) downstream of the heat exchanger in combination the following Features realized are:

a) the sieve device consists of two arranged in the housing (3), one horizontal each Pivot axis (4) pivotable separating sieves (5) and an upwardly open one Collector box (6), the collector box (6) extending orthogonally to the separating sieves (5) Collector box end walls (7), a collector box bottom wall (8) and collector box side walls (9-11), which collector boxes are (9-11) as screen walls are executed, furthermore the separating sieves (5) in a Siebtrichte'-uellung and in a The cleaning position is pivotable and at least in the sieve funnel position with its downstream side Enclose ends (12) between the header box end walls (7) or at their height end up,

b) the flushing flap (14) is arranged in the area of the upper edge (13) of the collector box (6),

wherein the cleaning body (1) fixed in the collector box (6) in the sieve funnel position of the separating sieves (5) are flushable.

2. Sieving device according to claim 1, characterized in that that the flushing flap (14) is adjustable in the axial direction of the sieve device.

3. Sieve device according to one of claims 1 or 2, characterized in that the flushing flap (14) is designed as a flat bar, the longitudinal edges of which form tear-off edges (15).

4. Sieve device according to one of claims 1 or 2, characterized in that the flushing flap (14) is designed as a streamlined bar, the trailing edge of which when set transversely to the direction of flow forms a tear-off edge (15).

5. Sieve device according to one of claims 1 to 4, characterized in that at least one the collector box side walls (9) and possibly the collector box bottom wall (8) aii the associated Separating sieve (5) is connected and can be pivoted with this.

The invention relates generically to a screening device for the cooling water flow of a tubular heat exchanger, esp. a power plant heat exchanger, - with a cylindrical, axially permeable housing and a sieve device that narrows in the direction of flow, an adjustable one in the sieve device Rinsing flap is arranged, which can be pivoted about an axis orthogonal to the axial direction of the housing is and the free screen space in the rinsing position except for one

ίο The edge area closes

In the known generic device (DE-AS 22 02 759) the sieve device is a sieve basket in the form of a conical jacket, at the tip of which a drainage pipe is connected. Inside the strainer basket there is a flushing flap with a on the inlet side the diameter corresponding to the inside diameter of the screen basket at the installation point, the installation point the flushing flap is at such a distance from the sieve foot in the direction of the sieve tip that on the Outside of the strainer basket when the flushing flap is closed, an annular gap remains when this flushing flap is closed eddy currents and turbulence form in the area behind the scavenging flap, through which the Solids adhering to the inner surface of the sieve basket loosened from the sieve surface radially inwards and in the direction be transported to the flap. Now, after these solids have been detached, the and closed valve fully or partially opened during the previous separation period and additionally the flushing flap inside the strainer basket is slightly turned on so that the solids are washed away Discharged without new deposits - This known screening device is used to separate impurities from the cooling water flow upstream of a tubular heat exchanger. It is arranged accordingly. she cannot simply be used behind a tubular heat exchanger as a device for separating cleaning bodies can be used from the cooling water flow.

In contrast, the invention is based on the object of the generic screening device so on train that they are used behind a tubular heat exchanger as a device for separating cleaning bodies from the cooling water flow can.

To solve this problem, the invention teaches that the following features are realized in combination are:

a) the sieve device consists of two arranged in the housing, one horizontal each Pivot axis pivotable separating sieves and an upwardly open collector box, the collector box Collector box end walls running orthogonally to the separating sieves, a collector box bottom wall and collector box side walls, soft collector box side walls designed as sieve walls are, furthermore, the separating sieves can be pivoted into a sieve funnel position and into a cleaning position at least in the sieve funnel position with their downstream ends between the collector box end walls enclose or end at their height,

b) the flushing flap is arranged in the area of the upper edge of the collector box,

cleaning bodies fixed in the collector box can be flushed free in the sieve funnel position of the separating sieves are. According to a preferred embodiment, the flushing flap is adjustable in the axial direction of the sieve device.

The feature a) of the above combination is known per se (EP-A 00 26 261). With this well-known Sieve device, the collector box is cleaned by opening the collector box when swiveling it in the separating sieves in their cleaning position. To open the collector's box there is at least one Collector box side wall connected to the assigned separating sieve and together with the collector box bottom can be swiveled out into its cleaning position when the separating screen is swiveled in. On the other hand is a Collector box in the known screening device is a relatively narrow unit between the side walls Not only do contaminants settle, cleaning bodies are also held there. If the collector box is cleaned in the manner described, these cleaning bodies are lost. In the device according to the invention On the other hand, cleaning bodies stuck there can be used when cleaning the collector box no longer get lost.

For further training there are several options within the scope of the invention. After preferred Embodiment, the flushing flap is adjustable in the axial direction of the sieve device.

An embodiment that is characterized by simplicity and functional reliability is characterized by that the flushing flap is designed as a flat bar, the longitudinal edges of which form tear-off edges. Is a such a bar arranged transversely to the direction of flow or even only at an angle to the direction of flow function the tear-off edges as tear-off edges and the turbulence-generating effect with its flushing effect with respect to the collector box occurs. If such a load is set parallel to the direction of flow, then becomes flows around it with practically no turbulence. This also applies to another embodiment of the invention, which thereby is characterized in that the flushing flap is designed as a streamlined bar, the trailing edge of which forms a tear-off edge when set transversely to the direction of flow. But also on the rounded leading edge In this position, the flow breaks off with the generation of turbulence. on the other hand such a streamlined flushing flap can also initially be used in one when cleaning the collector box Direction transverse and then swiveled by 180 °. In the sieve device according to the invention The collector box side walls can basically be components that are fixed in the collector box and thus are not operationally adjustable. In this case, the separating screens end upstream of these Collector box sidewalls. The collector box side walls can also be extensions of the separating sieves, whereby they are generally bent over a bend running parallel to the pivot axis connects to the actual separating sieves. In addition, both measures can be combined, d. H. the collector box can have collector box side walls that are partially fixed in the collector box are arranged and are partially pivotable with the separating sieves. At least one of the Collector box side walls and possibly the collector box bottom wall connected to the assigned separating sieve and be pivotable with this. Always implement the teaching of the invention through setting of the Turbuler.Zzeuger a perfect cleaning of the collector box, namely all inner surfaces to achieve in the collector box without the cleaning body held in the collector box getting lost. The cleaning is particularly intensive if the procedure is such that the trenir sieves in the sieve funnel position and the turbulence generator in the flushing position. Then one reaches namely that the sieve bars or sieve openings of the separating sieves support the generation of turbulence.

In a non-generic screening device of the same function (DE-PS 12 27 040) it is known to work with a collector box in which the collector box side walls are closed sheet metal plates, while funnel-shaped arranged sieve walls are provided orthogonally to the end walls of the embodiment according to the invention. Here a shut-off valve is arranged in the outlet slot of the separating sieves and another is located under the sieve walls of the collector box. With the help of these flaps, the pressure conditions on the one hand in the collector box and on the other hand in the housing outside the collector box can be set up, taking Bernouilli's relationship into account, & J-, for the purpose of cleaning from the housing, cooling water: is pressed into the collector box via the sieve walls and consequently the sieve walls are cleaned. Here, too, stuck cleaning bodies are not lost. With the generic sieve device, however, such measures cannot be implemented, because the pressure conditions in the sieve box and in the surrounding housing cannot be set here by the known butterfly valves so that the collector box side walls, which are designed as sieve walls, are very large in area compared to the known sieve walls Experienced. Instead of such cleaning by influencing the hydrostatic pressure conditions, the invention works, as it were, hydrodynamically with cleaning turbulence flows.

In the following the invention is illustrated by means of a drawing which shows only one exemplary embodiment explained in more detail. It shows in a schematic representation

1 shows an axial section through a sieve device according to the invention, orthogonal to the separating sieves, FIG. 2 shows a section in the direction AA through the object according to FIG. 1,

F i g. 3 shows a plan view of the object according to FIG. 1,

F i g. 4 in opposite to FIG. 1, on a much larger scale, a section of the object according to FIG. 1 and

F i g. 5 shows another embodiment of the object according to FIG. 4 excerpts.

The sieve device shown in the figures is used for separating cleaning bodies 1 from the K-'ihlvaiserstrom 2 behind a tubular heat exchanger, esp. behind a power plant heat exchanger. - The basic structure of the sieve device belong

an essentially cylindrical housing 3 through which the cooling water flow flows axially,

two separating screens 5 and arranged therein, each pivotable about a horizontal pivot axis 4
a collector's box open at the top 6.
The collector box 6 has collector box end walls 7 running orthogonally to the separating sieves 5, a collector box bottom wall 8 and also collector box side walls 9, 10, 11, which are designed as sieve walls. The separating sieves 5 can be pivoted into a sieve funnel position, which has been drawn in solid lines in the figures. They then form a troubled

directional narrowing sieve device. they are but can also be pivoted into a cleaning position, which is shown in FIG. 1 and in FIG. 4 dash-dotted lines was hinted at. At least in the sieve funnel position, they grasp with their outflow-side ends 12 between the header box end walls 7 as it was drawn.

But you could also complete at the height of the collector box end walls 7, in which case the Collector box side walls 9,10,11 in the collector box 6 can be fixed.

The header box 6 has at least one of the header box end walls 7 in the area of the upper edge 13 a flushing flap 14 in the form of a built-in body with one or more tear-off edges 15. Said The area can, in particular, also be below the edge

13 extend into the vicinity of the discharge pipe 18. The flushing flap 14 extends parallel to the pivot axes 4 of the separating screens 5. The Spuikiappe 14 is about its axis 16 between a turbulence-generating flushing position and a flow-around position adjustable.

F i g. 1 shows the uni flow position, FIG. 4 shows the flushing position. In Figure 4 it was further indicated that in Flush position turbulence 17 arise, which the collecting tank side walls 9,10,11 rinse and remove settled impurities that have passed through the drainage pipe 18 are discharged. Possibly stuck cleaning bodies 1 are also carried away and can consequently be recovered will. The cleaning body 1 are discharged via this drain pipe 18 when the Separating sieves 5 are in sieve position.

In the embodiment according to FIGS. 1 to 4, the flushing flap 14 is designed as a flat bar, the longitudinal edges of which the tear-off edges 15 form. In Figure 5 one recognizes the embodiment in which the flushing flap

14 is designed as a streamlined bar whose

nuaii irinivaiiiG LfCi L.ln3iGlluilg IjUCi £ Ui on v / liiungai IViI- tung a tear-off edge 15 forms. In all cases, several flushing flaps 14 could also be provided. Within the scope of the invention is an embodiment in which the flushing flap 14 is adjustable in the axial direction of the sieve device, in a position that is far away from the collector box 6, while the flushing flap 14 acts as a turbulence generator in a position in the area of the collector box inlet, because it forms tear-off edges 15 together with the parts of the separating sieves 5 or the collector box side walls 9, 10, 11 running at a small distance in this position

In the exemplary embodiment, a 9 of the collector box side walls 9, 10, 11 and the collector box bottom wall 8 connected to the associated separating screen 5 over the entire length. The opposite collector box side wall is as it were divided into two parts 10, 11, one of which 10 is arranged in a stationary manner and the other, as it were, Ii represents an extension of the separating sieve 5. An extension of the separating sieve 5 also forms the first-described collector box side wall 9 and both extensions 9, 10 are Connected to the actual separating screen 5 via kinks at 19. For cleaning the collector box 6 the separating sieves 5 are in the sieve funnel position and the flushing flap 14 is pivoted into the flushing position about the in F i g. 4 drawn in turbulence balls 17 an intensive cleaning takes place

65

For this purpose 2 sheets of drawings

Claims (1)

Patent claims: 1. Sieve device for the cooling water flow of a tubular heat exchanger ^ esp. A power plant heat exchanger, - with cylindrical, axially permeable housing and narrowing in the direction of flow Sieve device,