SU1627739A2 - Device for protection of steam-turbine plant - Google Patents

Abstract

The invention relates to the protection of modular steam turbine units and improves the reliability of protection against emergency acceleration of a turbine having a station-wide collector, residual vapor of the intermediate superheat path due to accelerated steam release. Device protection of the Ohotnaya steam turbine unit. TK-and contains a block for forced grriti prnl guards dzl valve 1. separator-steam superheater 4 connected with the generator disconnection sensor 24 from the mains, blocks 28 and 29 detecting faults in control of channel 11 and organ 13 and collector of station general needs, which ensures a quick reduction of pressure to the level of pressure in the condenser 8, eliminating the possibility of steam under pressure from the separator-superheater 4 into the low pressure cylinder, and consequently, the possibility of turbine acceleration by this steam. 2 Il. i (Л С

Description

UNION OF SOVIET

SOCIALIST

REPUBLIN _M SU _a „1627739 A 2 (51) 5 ^{F 01} 0 21/02

STATE NOMINATION

BY INVENTIONS AND DISCOVERIES

AT SCST USSR

DESCRIPTION OF THE INVENTION

TO AUTHOR'S CERTIFICATE

(61) 773300 (21) 4668668/06 (22) 02/13/89 (46) 02/15/91. Bull. No. 6 (71) Zaporizhzhya Nuclear Power Plant (72) V.V. Marynich (53) 621. 165 (088.8) (56) Copyright certificate of the USSR No. 773300, cl. F 01 D 21/02, 1980.

(54) DEVICE FOR PROTECTING A BLOCK STEAM TURBINE INSTALLATION (57) The invention relates to the protection of block steam turbine installations and allows to increase the reliability of protection against emergency acceleration of a turbine having a collector for general station needs, residual steam of the intermediate overheating tract due to accelerated steam discharge. The device for protecting the block steam turbine installation contains a block 36 forcing the safety valve -. 1 5 steam superheater separator 4, connected to the sensor 24 for disconnecting the generator from the mains, blocks 28 and 29 for detecting a malfunction in the control of channel 11 and organ 13 and the collector for general station needs, which ensures a rapid decrease in pressure to the pressure level in the condenser 8, eliminating the possibility of steam supply under pressure from the separator-superheater 4 to the low-pressure cylinder, and therefore, the possibility of accelerating the turbine with this steam. 2 ill.

Figure 1

SU 1627739 A 2

P-27739 ι 'i.ii qx π- refers to the heat energy, in particular to devices with ίο sewn up ι, ι block steam-turbine furnaces. 5

The objectives of the invention is to increase the reliability of protection against accidental acceleration of a turbine of an installation having a collector for general station needs, the residual steam of the intermediate overheating path due to acceleration of discharge of pa 13 l

In FIG. 1 shows a diagram of a device for protecting a block steam turbine installation; in FIG. 2 is an electrical diagram of a device for forcing the safety valve of a separator superheater, the steam turbine unit includes a steam generator 1, a steam turbine 20 comprising a high pressure cylinder 2 and a low pressure cylinder 3, a steam superheater 4, a generator 5 connected to the network 6 through switch 7, condenser 8 25 and heater 9. Control valves 10 and 11, turbine safety elements 12-14, condenser safety body 15, safety valves 16 and 17 respectively ce-jg and adapter Ora-superheater 4 and heater 9, as well as safety valves 13 and 19, are located on the steam lines behind the steam generator 1 and behind the separator-superheater 4. The 35 β steam turbine unit also includes a speed controller 20, an automatic safety device 21, a speed sensor 22 and a sensor 23 accelerations associated with the turbine rotor, sensor, dd 24 disconnecting the generator from the network, blocks 25-29 for detecting malfunctions in the control of valves 10 and 11 and safety bodies 12-13, actuators 30 and 31, pressure sensors 32 and 33, relay the second block 34 controls the safety body 15 and valves 16-19. The regulator 20 under: 1 is connected to the valves 10 and 11, the automatic machine 21 safety is connected to the safety organs 12 and 13, and the sensor 24 is connected to the safety organs 14,

The safety element 15 and the valve 16-19 are valves with a large orifice or membranes, bursting by the control signal and ensuring the discharge of steam in ii.'ipoapiieMiniK Za.

Extras. the forced opening unit 36, which is equipped with a safety valve 1b of the superheater separator 4, is connected to the generator disconnection sensor 24, the failure control units 28 and 29 to control the valve 11 and the safety organ 13, are supplied with steam from the general plant collector.

The additional unit 36 contains a pulse valve 37 with an electromagnetic actuator (not shown), powered by steam of the collector of general station needs, and an additional logic element And 38 connected to the control circuit of the valve 37, to the inputs of which are connected 24 sensors to disconnect the generator from the network, as well as blocks 28 and 29 detection of malfunctions in the control of the valve 1 1 and the safety body 13.

The device operates as follows,

During operation of the block steam turbine installation in normal mode, the safety valve 16 on the separator-superheater 4, tuned to a certain value of the working steam pressure, is closed. When this value is exceeded, the valve 16 opens and remains open until the vapor pressure drops to a predetermined level, after which the valve 16 closes and the operation of the block steam turbine installation continues

In case of emergency disconnection of the generator 5 from the network 6, the signal from the sensor 24 is fed to the input of the logic element AND 38 of the additional unit 36 ₌ If the control valve 11 and the safety organ 13 do not work, which are standard means of preventing the turbine from accelerating when the generator is disconnected from the network, the signals about the failure of the valve 1I and the safety body 13 are fed to the input of the logical element And 38 from the blocks 28 and 29 detection of malfunctions. At the same time, the logic element And 38 sends a signal to the automatic solenoid power supply of the electromagnetic drive of the pulse valve 37. The working body of the pulse valve 37 moves and opens access for a couple from a source with a stable, independent of the operating mode and steam turbine

162 77 39 hanshkn, '1- | and.11, and the quality of which I have chosen is the steam collector of the most basic needs, for the servomotor of the safety valve 16. $

The safety valve 16 opens and the steam contained in the superheater separator and pipelines of the intermediate superheat path is discharged directly through the open valve 16 directly from the superheater separator, which ensures a rapid decrease in pressure to the pressure level in the condenser 8, thereby eliminating the possibility of ingress of 15 steam under pressure from the separator-superheater 4 to the cylinder 3 low pressure, and therefore, the possibility of acceleration of the turbine with this steam.

On the other hand, due to the fast 20-th steam discharge from the superheater 4 through the valve 16, it is impossible to get into the cylinder 2 a high pressure separator, which can be caught by the steam discharged from the intermediate superheating path under conditions of boiling of the superheater 4 when a sharp decrease in vapor pressure in it.

consequently, the possibility of damage to the running part of the staged part by this separator is excluded! high pressure of the turbine, as well as bearings of bearings from significant vibrations that occur when the separator enters the high pressure cylinder of the turbine.

Claims (1)

The formula is invented! ' I A device for protecting a block steam turbine installation according to ed. St. No. 7 73 300, characterized in that, in order to increase the reliability of protection against accidental acceleration of a turbine of an installation having a collector for general station needs, the safety valve of the superheater separator is equipped with a forced opening unit associated with the generator shutdown sensor, control valve and safety valve failure detection units body located on the steam line behind the separator-superheater and collector for general station needs. Par l valve 16 Figure 2