DE1913228A1 - Water separator superheater - Google Patents

Description

83/68 DrW / uk

Aktiengesellschaft Brown, Boverl & Cie., Baden (Switzerland)

. Water separator superheater

In today's nuclear power plants, the steam leaves the HP turbine mostly wet. In a water separator superheater the water is separated from this steam and the dehydrated steam is then transferred to a heat exchanger superheated by means of live steam before it enters the LP cylinder Turbine is guided. This improves efficiency and prevents the LP blades from being eroded. The water separation from wet steam using a wire mesh mattress and subsequent overheating using a tubular heat exchanger is known, for example according to the following arrangements:

a) Axial steam introduction into the lower half of the horizontal, cylindrical container, which is carried by a wire mesh mattress in the horizontal plane 'through its longitudinal axis is divided. In the upper half is a heat exchanger arranged with IJ tubes, the steam emerges vertically upwards the end. - Disadvantage? Bad utilization of the cross section of the container, therefore large dimensions? that in the horizontally lying tube bundle Accumulating condensate requires flushing steam for discharge (Loss of efficiency of the system).

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b) Steam introduction from below or axially into the horizontal, cylindrical container. In the lower half of the container are two wire mesh mattresses arranged exactly one above the other, Heat exchangers with horizontally positioned pipes are installed in the upper half of the container, with the steam duct takes place along the pipes. The steam escapes upwards. -. Disadvantages: Large axial steam flow velocity to the Wire mattresses; numerous steam diversions and thus increased Pressure loss; Effect of the horizontal position of the pipes as under a).

The aim of the present invention is to remedy the disadvantages and to find a technically and economically more favorable solution. It is characterized by shielding means between the Wet steam inlet and the inflow space in front of the wire mesh mattresses and through a staircase nested arrangement the wire mesh mattresses, their entry area, respectively with the exit area of the mattress arranged above is connected by a drop masking sheet, as well as characterized by the in the outflow space immediately following the Mafcratzen exits arranged tubular heat exchanger with, in order to Self-watering, steeply sloping pipes.

An exemplary embodiment of the subject matter of the invention is provided by an-SGlaiiessemct explained using a figure, which in purely scheiüiatisoher Representation of a cross section of a water drain

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The drum-shaped water separator Ue "superheat jacket 1 shown in the figure 1st circular cylinder with a longitudinal axis 2. The entry of the wet steam occurs through an inlet opening 3 in a Troiomelboden of the water separator superheater, while the superheated steam through an outlet 4, which at any point A protective wall 5 is installed between the inlet opening 2 and an inflow space 7. At the lowest point of the water separator superheater there is a drainage line 9 Arranged one above the other, serve to dewater the wet steam. Between these wire mesh mattresses 11-14, drop cover plates 17-19 are provided, which connect the inflow area of one mattress with the outflow area of the mattress arranged above, in such a way that two subsequent mattresses with the associated drop cover plate in each case Qu cut appear Z-shaped. The widths A ₁ B, C and D of the mattresses 11-14 are proportional to the steam inflow cross sections AB, BC, CD and DO. This ensures that the steam entry speeds into the spaces between the wire mesh mattresses are the same. Behind the wire mesh mattresses 11-14 a steam outflow space 21 is provided in which there are overheating pipes 22 which are arranged at a steep incline. These run in normal planes to the longitudinal axis 2. The superheater tubes 22 are acted upon via a heating steam inlet connection 24 and a distributor. Down in the superheater is

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a condensate outlet nozzle 25 for discharging the accumulating Condensate provided.

When the system is in operation, the wet steam flows out of the high-pressure section of the steam turbine system through the inlet opening 5 into the

■ Water separator superheater, in which it is largely deflected by the shielding wall 5 in order to get into the inflow space 7. The free flow area between the shielding wall 5 and the water separator superheater jacket 1 is approximately the same size as the cross-section of the inlet opening 3. The installation of the shielding wall 5 prevents the wet steam from flowing at high speed directly into the tree under the wire mesh mattress 11-14 . This also results in a more uniform application of wet steam to these spaces, as well as a direction of flow of the steam which allows it to flow through the water separator superheater with practically no further, significant deflection. Hardly 7 additional fixtures can be provided for rectifying and evenly distributing the steam along the container, such as deflection baffles, perforated

sheet metal or the like. Using the built-in wire mesh mattresses most of the water contained in the wet steam is excreted. This gets into the drainage line 9 and is fed back into the steam cycle from there. The almost anhydrous steam then flows around the superheater tubes 22, in which the heating steam flowing in through the connection 24 gives off its heat to the dewatered steam and condenses, with

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the condensate through the inclined superheater tubes 22 in a Collector drains from. which it through the nozzle 25 also is fed to the steam cycle. That way will the dehydrated steam sweeping around the superheater tubes 22 is superheated and passes through the outlet 4 into the low-pressure part of the Steam turbine plant. ·

As can be seen from the figure, in the case of the water separator superheater described, the wet steam is passed through in one pass the wire mesh mattresses 11-14 and then directly, for the purpose of overheating, passed through the tubular heat exchanger., Both the wire mesh sections and each superheater extend over the entire length of the water separator

This version has ^{the following tföfteile compared to 1} the previously known constructions

- The supply of wet steam can over a short distance and without prior drainage take place.

- The pressure loss in the described water separator -. Overheating z.er is minimal _s because the wet steam is deflected very little and the steam speed when flowing through the water separator superheater. is kept as constant as possible.

- The extraction of the superheated steam can be done at or at several places along the apparatus suitable for the turbine take place.

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- The circular cross-section of the container is optimally used .

- The condensate of the condensing heating steam runs off automatically, so that no flushing steam is required for its drainage will.

The described execution of a water separator overheater requires only about 2/3 of what was previously required for the same performance Flatzbedärfes and weighs only 2/3. If is also Difficult to disrupt and simple in structure * so that also with regard to Cleaning favorable conditions arise *

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Claims (1)

Claims ! Γ 1. Water separator superheater with wire mesh mattresses and Λ ^/ ν _: connecting tubular heat exchanger, which is in a cylindri-. ! See »drum-shaped coat are housed, as well as with Ί ί ί Linen wet steam connection in the Tronanel base, marked with -; _: -j shielding means (5) between the wet steam inlet (3) and the inlet 1 flow room (7) in front of the wire mesh mattresses (11-14) and through 1 tine nested arrangement of the wire I wicker mattresses (11-14), the entry area each with ι through the exit area of the mattress arranged above it ΐ a teardrop cover plate (17 * 18,19) is connected, as well as marked * I is characterized by the in AbstaBnraua (21) immediately following _'t of the mattresses outlets arranged tubular heat exchanger bit, for the purpose of self-drainage, greatly inclined tubes (22). '; : 2. Vasser Abschelder superheater according to claim 1, characterized in that the tubes (22) of the heat exchanger approximately j run at right angles to the longitudinal axis (2). 5. Water separator superheater according to claim 1, characterized marked. shows that the free inflow area into the inflow space (7) Is at least approximately the same as the cross section of the inlet opening (3). 4. Wasserabsöheider superheater according to claim 1, characterized indicates that in the Zuströarauii (7) facilities for the same 009808/1071 ORIGINAL INSPECTED massive distribution of steam and for flow straightening are built in. 5. Water separator superheater according to claim 1, characterized in that that the outlet <4) for the superheated steam is inclined upwards e.g. under 45 °. 6. Water separator superheater according to claim 1, characterized in that the inlet cross-sections (AB ₉ BC, CD ₉ DO) are proportional to the mattress width (A, B, C, D). Public company Brown, Boveri & Cie. Central Dept. Ill No. £ ^ / »9 009808/1071