SU1285164A1 - Steam-turbine plant - Google Patents

Abstract

The invention relates to a power system and allows to increase efficiency by reducing steam consumption through a low pressure cylinder (LPC) and cooling steam, as well as reducing erosion wear of the blades. The diffuser, located behind the last stage of the LPC, is equipped with: root and peripheral annular walls built into its walls chambers 9 and 10 with discharge and receiving slots

Description

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11 and 12, respectively, and the entrance directions of the slit 12 and the exit of the slit 11 coincide. The diffuser communicates via the exhaust pipe 5 with the main condenser (K) 6, which is connected to the first stage 23 of the ejector (E) 24 via the steam-air mixture. An additional 15 K is connected to the chamber 10 by steam, and the additional exhaust air 16 is connected to the steam space K 6, suction to additional K 15. In the absence of steam access to the low pressure cylinder 3. via line 4, it enters chamber 9 from selection 2. Directing from slot 11 to the periphery of the blades 26 and destroying the vortex, the steam present there is drawn into slot 12 and enters in K 15, where a vacuum of 16. 16 is maintained. zDuschna mixture flows in R 6, where E 24. 1 otsasgoaets yl.

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The invention relates to heat and power engineering and can be used on heat generation and condensation steam-turbine plants when operating, respectively, on thermal graphics and at idle.

The aim of the invention is to increase efficiency by reducing steam consumption through a low pressure cylinder (LPC) and cooling steam, as well as reducing erosive wear of rotor blades.

The drawing shows the principle of (a diagram of the turbo.

The steam turbine plant consists of a high pressure cylinder (HPP) 1 with a take-off 2 and a low-pressure cylinder 3 connected to the high-pressure cylinder 1 by pipeline 4. The low-pressure cylinder 3 has an exhaust pipe 5 passing into the main condenser 6 into the internal 7 and outside 8 walls of the exhaust pipe 5 respectively, the root and peripheral annular chambers 9 and 10. An annular outflow slot 11 is formed in the root chamber 9, and peripheral chamber 10 has a ring receiving slot 12. The directions of the entrance of the receiving slot 12 and the outlet of the outlet slot 11 are the same. An additional capacitor 15 is connected to the peripheral annular chamber 10 by conduit 13 with a frontal organ 14 and provided with an additional ejector 16. The inlet of the annular chamber 9 by conduit 17 with a regulating locking member 18 and a desuperheater 19 is connected to take-off 2 (source of cooling steam). The controller 20 is connected by a communication line 21 to the sensor.

temperature 22, located in the peripheral chamber 10. With the main condenser 6 is connected by vapor-air mixture the first stage 23 of the main three-stage ejector 24.Internal 7 and outer 8 wall image5pot diffuser 25 located behind the working blades 26 of the last stage 27 of the low-pressure cylinder and communicated through the exhaust pipe 5 with the main condenser 6. The additional pump ejector 16 is connected to the steam space 28 of the additional condenser 15, and the exhaust is connected to the steam space 29 of the main condenser 6. Additional condenser 15 the condenser pipe 30 through the hydraulic lock 31 is connected to the path 32 of the main condensate to the condensate pump 33. The first stage 23 of the main ejector 24 is in communication with the second 34 and third, 35 steps. The control module 3 is equipped with a control diaphragm 36.

Steam turbine installation works as follows.

In the absence of steam access via conduit 4 from CVP 1 to LPC 3 (or partial passes of this steam), steam from selection 2 enters the root chamber 9, if necessary, it is cooled in the desuperheater 19 from the outlet slot 11 of the root chamber 9, having an insignificant the degree of overheating is directed by an annular jet to the periphery of the working blades 26 of the last stage 27 (to the zone of the presence of a toroidal vortex). Having destroyed the vortex, the steam is drawn into the annular receiving slot 12 of the peripheral

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chambers 10, where the pressure is lower than in the exhaust manifold 5 after the last stage 27. From the peripheral chamber 10 pairs through conduit 13 enters an additional condenser 15, where an additional ejector (6 maintains a vacuum that is deeper than in the main condenser 6.) The mixture from the additional ejector 16 enters the vapor space 29 of the main condenser 6. Condensate from the additional condenser 15 is sent through the hydraulic lock 31 to the main condensate track 32 to the inlet of the condensate pump 33.

The steam-air mixture from the main condenser 6 is sucked off by the second 34 and third 35 steps of the main ejector 24. At the same time, the first step 23 of this ejector is disconnected by a couple and does not work, due to which the necessary difference in vacuum between the additional condenser 15 and the main condenser 6 is achieved.

If it is necessary to cool LPC 3, except for the last stage, 27, partial steam is passed to LPC 3 from HPC 1 via pipeline 4. This steam, passed through LPC 3, is partially condensed in an additional condenser 15 and partly with steam flowing out of the root chamber. 9, flows through the inlet slit 12 into the peripheral chamber 10 and from there into the auxiliary capacitor 15. Steam passage through the CLRD 3 can be controlled, for example, by adjusting the diaphragm 36.

Transfer of the turbine from the mode according to the thermal schedule or from idling to the modes which do not pipe cooling of the ATC 3, for example on the condensation

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the mode is carried out by opening the steam access to the LPC 3 from the HPC 1 through the pipeline 4. The regulating and shut-off member 18 closes before the steam enters the root chamber 9. The shut-off member 14 in the pipeline 13 is also closed, the cooling water to the additional condenser is stopped 15, and

 O continues to discharge the cooling water of this condenser 15.

Claims (1)

Invention Formula  5 A steam turbine installation containing a high pressure cylinder with steam extraction, a low pressure cylinder, after the last stage of which a diffuser is placed, communicated through the 20 / cut exhaust pipe with the main condenser and equipped with root chambers and peripheral annular chambers built in its walls with discharge and receiving slots, respectively , and the input of the root annular chamber is connected to a source of cooling steam, and an ejector, the inlet of which is in communication with the condenser, is designed so that, in order to increase the efficiency reducing the flow of steam through the low pressure cylinder and cooling steam, as well as reducing the erosive wear of rotor blades, the installation 35 is equipped with an additional -capacitor and an ejector, the exhaust of the latter is connected to the vapor space of the main condenser and suction to an additional condenser that is paired with the peripheral annular chamber, while the entrance slots of the receiving slit of the latter and the outlet of the outlet slit of the root annular chamber coincide. 25 thirty