SU1687806A1 - Steam turbine cylinder - Google Patents

Abstract

The invention makes it possible to increase the reliability and efficiency of the apparatus by reducing the circumferential unevenness of the flow pressure in the flow part around the inter-exchange gap. The partition 8 forming the side walls of the annular channels (K) 9, the end 10 is connected to the clips in the area of the annular gap 5, and its end 11 is located in the outlet nozzle 2. At the entrance to K 9, the side elements are installed on the side of the gap each of which is connected with partitions. With this design, the same pressure drop in the path of the gap is ensured - the outlet pipe is selected by a selection of hydraulic resistance, depending on the length K 9, and by splitting the specific steam flow around the gap circumference. Instead of an annular jet, a direction is formed along the flow axis in each K 9, which does not form vortex regions in the free cavity of the selection chamber 4. The continuous flow at the entrance to K 9 allows the use of a part of the kinetic energy of the flow accelerated in the gap with a limited width. 15 il. 3 Ю О 00 J 00 о о Figure 2

Description

The invention relates to power engineering and can be used in steam turbines with steam extraction.

The purpose of the invention is to increase the reliability and efficiency of the apparatus by reducing the circumferential unevenness of the flow pressure in the flow part near the inter-gap gap.

FIG. Figure 1 shows the structure of an element of a medium pressure cylinder (DS1) of a steam turbine with a selection chamber; in fig. 2 is a node diagram (Normalization of the flow in the selection chamber of a steam turbine DSC with six rectangular channels with a symmetrical arrangement of the inter-ring ring chanted to extract steam from the flow section;

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The distance between the barriers 8 and the position of the bar 12 depend on the length of the channels 9 so that the ratio of the hydraulic diameter to the length of the center line 15 of the channel 9 is the same for all the channels 9. The length of the channels 9 is determined by the layout of the steam flow generating unit 7, which depends on the position of the annular gap 5 relative to the vertical walls 16 of the clips 3, on the number of nozzles 2 of the extraction chamber 4 and their relative position. For the considered variant of the steam flow forming unit 7, there are six channels 9, covering the annular gap 5 and dividing it into equal parts in arcs of 60 °, with three channels 9 occupying the side left of the nozzle 2,

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15

FIG. 3 - an element of a cylinder with a partition a three right, providing a movement 30

Kami; in fig. 4 is a view of L in FIG. 3; in fig. 5 is a diagram of the normalization of the transition diffuser from the annular gap (slit) to the steady section for the annular channel of the flow forming unit 25 in the selection chamber; in fig. 6 is a section I in FIG. four; in fig. 7 is a section II in FIG. 4; in fig. 8 is a section III in FIG. four; in fig. 9 is a section IV in FIG. four; in fig. 10 is a section of V in FIG. four; in fig. 11 is a section VI in FIG. four; on league. 12 is a section VII in FIG. four; on league. 13 is a section VIII in FIG. four; on Lig.14 - section IX figure 4; on league. 15 - transitional part of the annular channel from the annular gap to the constant section of the channel.

The steam turbine cylinder (figure 1) contains an outer casing 1 with a pipe 2 selection. The diaphragm clips 3 form a selection chamber 4 and an annular gap 5, which communicates the selection chamber 4 with the flow part 6 of the cylinder.

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steam in counter flows. In this case, the lengths of the middle lines 15 of the channels 9 differ by no more than 1/3 of the length of the middle line 15 of the longest of the channels 9.

At the entrance 17 to the channels 9, at the transition of the flow from the annular gap 5 to the channel 9, guide elements 18 (Fig. 3 and 4) are installed, the lateral edges 19 of which are connected to the partitions 8 or to the partitions 8 and the outer casing 1 of the selection chamber 4 for individual channels 9. One of the end edges 20 is connected to the holder 3 along the annular gap 5, the other end edge 21 (FIGS. 3 and 4) is connected to the end surface 22 of the protrusion 23 of the holder 3.

The cylinder with the camera selection works as follows.

When steam is taken out of the cylinder 6 flow-through part 6, it enters through the annular gap 5 into the selection chamber 4, the steam flow-forming unit 7, the world has vortex currents in which the extraction frequency-chamber 4 is in the form of dimming dynamically head

body (tangential) partitions 8, forming annular channels 9.

Tangential partitions 8 at one end 10 are connected to the clips 3 in the zone of the annular gap 5.

The other end of the 11 tangential partitions 8 is located in the outlet 2.

A vertical partition 12 forming the side posts of the channels 9, the lower end 13 is connected with the clips 3 in the area of the annular gap 5, the outer end 14 is connected with the outer case 1.

and three right, ensuring the movement

steam in counter flows. In this case, the lengths of the middle lines 15 of the channels 9 differ by no more than 1/3 of the length of the middle line 15 of the longest of the channels 9.

At the entrance 17 to the channels 9, at the transition of the flow from the annular gap 5 to the channel 9, guide elements 18 (Fig. 3 and 4) are installed, the lateral edges 19 of which are connected to the partitions 8 or to the partitions 8 and the outer casing 1 of the selection chamber 4 for individual channels 9. One of the end edges 20 is connected to the holder 3 along the annular gap 5, the other end edge 21 (FIGS. 3 and 4) is connected to the end surface 22 of the protrusion 23 of the holder 3.

The cylinder with the camera selection works as follows.

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five

steam jet. A portion of the static pressure differential is used to form the flow in chamber 4 towards the suction port 2. The rotating streams from the extraction chamber 4 in the region of the nozzle 2 collide with each other, with the mutual deceleration the flow rate component becomes zero. Then, under the action of static pressure, steam enters the extraction nozzle 2 and then into the heater (not shown). Thus, in the selection chamber without a node 7 Lormirova-i

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Neither the main source of mechanical energy loss is the vortex regions and the zone of the collision of the eddy currents.

When using the flow-forming unit 7 in the extraction chamber 4, under the action of a pressure differential, it flows from the flow-through part 6 into the annular inter-exchange gap 5, in which a speed is established proportional to the active cross section of the gap 5.

If the area of the area of the annular gap 5, which is connected to one annular channel 9, is less than the transverse area of channel 9, at the entrance 17 to channel 9, the static pressure is restored as the flow velocity decreases. The flow from the annular gap 5 rotates without Lor-2Q, the separation of the separated flow and flows as a plane-parallel flow into the channel 9, in which the flow is similar to the flow in the pipes.

In the outlet nozzle 2, steam is flowing from all the channels 9 of the flow forming unit 7, steam is conducted by this nozzle 2, or part of the channels 9 when two or more nozzles 2 are arranged in the outlet Nozzle 2 is the confluence of the flows from all the channels 9 and the further movement of steam into the preheater, the hydraulic resistance of the extraction chamber 4 is reduced due to rational flow organization and the pressure drop from the flow section 6 to the preheater is reduced and the feed water in the latter can be heated to its heat.

The circumferential pressure irregularity in the flow part 6 is eliminated by the fact that for each channel 9 of the node 7 of the Normalization of flow, there are only 30

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depending on the length of the channel 9, the equality of the specific steam consumption and the circumference of the annular gap 5. At the same time, the division of the circumference of the annular gap 5 between the channels 9 can be uneven. Instead of an annular jet, a direction is formed from the gap 5 along the flow axis in each channel 9, which does not form vortex regions in the free cavity of the extraction chamber. In channels 9, the energy consumption is mainly from friction on their surface. In this case, the continuous flow at the inlet 17 (in the di Uguzor) into the channel 9 allows the use of a part of the kinetic energy of the flow accelerated in the annular gap 5 with a limited width.

Claims (1)

Invention Formula A steam turbine cylinder containing an outer casing with a tailpipe and its protrusions installed therein and arranged with an annular gap of the diaphragm clips, which, with the outer casing, form a sampling chamber with a partition defining an annular channel that differs from in order to increase reliability and efficiency, the cylinder is equipped with additional bulkheads dividing the selection chamber into annular channels, one end of which is connected to the collars in the annular gap area, and the other is located in the selection nozzle; th inlet into annular channels by the annular gap further guide members are installed, side kro ki of each of which are connected to respective additional re towns, one of the end edges arcing pressure drops in the col 45-track with the collar along the annular gap, Target gap 5 - selection pipe 2 by selection of hydraulic resistance of a friend - with the end surface of the cage protrusion. 0 Q five 0 five 0 depending on the length of the channel 9, and the equality of the specific steam flow around the circumference of the annular gap 5. In this case, the breakdown of the circumference of the annular gap 5 between the channels 9 may be uneven. Instead of an annular jet, a direction along the flow axis in each channel 9 is formed from the gap 5, which does not form vortex regions in the free cavity of the selection chamber 4. In channels 9, energy is expended mainly on friction on their surface. In this case, the continuous flow at the inlet 17 (in the di Uguzor) into the channel 9 allows the use of a part of the kinetic energy of the flow accelerated in the annular gap 5 with a limited width. Invention Formula A steam turbine cylinder containing an outer casing with a selection nozzle and its protrusions installed therein and diaphragms arranged with an annular gap of the cage, which also form an outflow chamber with a partition defining an annular channel, with the aim of increasing reliability and efficiency, the cylinder is equipped with additional partitions dividing the extraction chamber into annular channels, one end of which is connected to the clamps in the annular gap area, and the other is located in the extraction nozzle, This inlet annular channels by the annular gap further mounted guide members, the side edge of each of which are connected to respective additional partitions, one of the end edges and the other - with the end surface of the protrusion holder. Jf. / fs g w / ABOUT --f-J t B -Ј J t X h ate 00 -J 00 oh l SL with fes 5 V Have Editor N.Kishtulinets Compiled by V.Gutorov Tehred L.Serdyukova Proofreader A.Obruchar go Phil. IS