SU1173049A1 - Steam power plant - Google Patents

Abstract

PAROSIL INSTALLATION, containing turbine cylinders, end seals of which have vapor-air mixture suction chambers in communication with the ejector of seals, stuffing boxes communicating through the gland steam manifold with the seals collector, the chambers of the condensing steam with regulator are connected to the latter pressure, low-pressure general station manifold, start-up and main ejectors, characterized in that, in order to increase efficiency, the stuffing box collector is connected to a pipeline for supplying sealing steam to the pressure regulator and is additionally connected to the general station W low pressure manifold and to the nozzles of the ejector of seals, starting and main ejectors.

Description

four

UD

one

The invention relates to a power system and can be used in thermal circuits of steam turbines.

The aim of the invention is to improve the economy.

Pa drawing shows a schematic diagram of the steam power plant.

The steam-powered unit contains high, medium and low pressure cylinders 1, 2 and 3 (HPC, CCD, low-pressure cylinder), the end seals 4, 5 and 6 of which have vapor-air suction chambers 7 communicated with the ejector 8 of the seals. Sealing chambers 9 of seals 4 and 5 communicate with a collector 10 of gland steam with a sealer 11 of seals, chambers 12 of steam have been connected to the last seal 6, and pipe 13 for supplying seal steam with pressure regulator 14 is connected. The stuffing box manifold 10 is connected to a pipeline 13 for supplying sealing steam to pressure regulator 14 by pipeline 15 with pressure regulator 16 mounted on it and additionally communicated with low-pressure common station collector 17 and ejector nozzles 8 for seals, starting ejector 18 and main ejectors 19. The suction chambers 20 by lines 21, 22 and 23, on which the adjustment (regulating) bodies 24, 25 26 are installed, are connected to the steam extraction pipeline 27. Chambers 12 of the sealing steam of seals 6 TSSD 2 and TsNDZ lines 28, 29 and 30, on which the adjusting (regulating) bodies 31, 32 and 33 are installed, communicate with the collector 11 seals, and from chambers 12 seals 4 CVP 1 lines 34 and 35 inlets, on which the building bodies 36 and 37 are installed, are also communicated with the seals collector 11. One of the packing chambers 9 of the seal 2 of the HPC 1 is connected to the pipeline 28 for supplying hot steam. On the cooling medium, the ejector 8 seals and main ejectors 19 are included in the path 39 of the main condensate.

Steam installation works as follows.

When the turbine is under load, the steam passing through seals 4 and 5 from the stuffing boxes 9 CVP 1 and DCP 2 enters the collector 10 sal0492

nmkovy steam, where steam is supplied through the pipeline 13 for supplying sealing steam through the regulator 16, which maintains the pressure in the manifold 10 of the stuffing steam at a constant level. The steam from the collector 10 is fed to the working nozzles of the ejector 8 of the seals, the starting ejector 18 and the main ejectors 19. The number

the steam supplied to the collector 10 is determined by the position of the tuning bodies 24, 25 and 26 on the lines 21, 22 and 23 of suction of steam from the chambers 20 of the seals to the extraction line 27, the position of the tuning bodies 24, 25 and 26 is determined from the conditions of the necessary feed of the collector 10 by sealing steam from supply line 13 through pressure regulator 16.

Constant feeding of the collector 10 even in modes with an excess of steam entering it from the stuffing boxes 9 of seals 4 and 5 is necessary for reliable operation of the pressure regulator 16.

The steam from seal chambers 12 of seal 4 and 5 enters the seal manifold 11, from where it is fed to seal 12 chambers 12 of seal 6 of low-pressure cylinder 2 and low-pressure cylinder 3 through adjusting elements 31, 32 and 33. Pressure in the collector 11 of the seal maintains regulator 14 pressure.

Steam temperature 11

UP-POTNSNY, necessary according to the conditions of operation of seals 6 LPC 3 and seals 6 grandfather 2, is set up by the organs 36 and 37 on the lines

33 and 3 of the steam supply to the collector 11 of seals from the chambers 12 of the sealing steam.

From the chambers 7 of the steam-air mixture suction, the steam-air mixture is sucked by the ejector 8 of the seals.

When the turbine is started up, when steam from HPC 1 and CCD 2 is not supplied to seals 4, 5, only condensing steam is fed to manifold 10

13 supply through the controller 16.

This steam is supplied to the stuffing boxes 9 of seals 4, 5, and they are locked to provide a set of necessary vacuum. The sealing of the seals 6 is carried out with steam supplied from the seals collector 11 to the chambers 12 in the same way as

This is the case when the turbine is operating under load.

When switching from starting modes to operating modes under load, the direction of steam movement between the collector 10 and the stuffing boxes 9 changes, but this does not change the pressure in chambers 7, 9 and 12 of seals 4, 5 and chambers 7, 12 of seals 6 and makes the operation of end seals 4, 5 and 6 not dependent on the operating modes of the installation.

When the turbine's operating mode changes from idle to maximum load, the pressure in the manifold 10 maintains regulator 16, which changes its position from full open to almost complete closing.

When starting the turbine from a hot state or relieving the load in order to keep the relative expansion of the high-pressure rotor within acceptable limits, the stuffing box 9 is supplied with a hot steam supply through the front seal pipe 38.

If there is sufficient condensate flow in the path 39 of the main Condensate through the ejector 8 of the sealN and the main ejectors, their performance depends only on the pressure of the working steam in front of their nozzles. The level of this pressure is chosen to be minimal due to the efficiency of the circuit, but not below the level that ensures reliable operation of the ejectors 8 , 18 and 19 with the highest possible air suction. This pressure is maintained by the regulator 16 and does not depend on the operating modes of the turbo-installation.

The operation of the steam power plant can be adjusted with the help of tuning bodies so that when the consumer has the appropriate pressure at the power station, he can give him all the possible surplus of low potential steam taken into the collector 10 from the stuffing boxes 9.

Thus, the presence of a stuffing steam manifold in communication with the working nozzles of the ejector, compaction of main ejectors, start-up injector and low-pressure common collector, allows using low-pressure pairs of seals for operating the ejectors and powering the common station collector an unauthorized source, for example, a separator, which increases the efficiency of the operation of a steam-powered unit by increasing electricity generation.

Claims (1)

STEAM POWER PLANT, containing turbine cylinders, end seals of which have air-vapor mixture suction chambers in communication with seal ejector, stuffing box _? The chambers connected through the gland steam manifold with the seal manifold, the latter are connected to the chamber of the vapor pair and the pipeline for supplying the sealing pair with a pressure regulator, a low-pressure common collector, a starting and main ejectors, characterized in that, for the purpose of increasing efficiency, the collector stuffing box steam is connected to the pipeline for supplying sealing steam to the pressure regulator and is additionally communicated with the low-pressure common-station manifold and with nozzles of the ejector seals, PU kovogo and basic ejectors. SU „„ 1173049