RU2413074C2 - Method of parallel start of turbine with back pressure and turbine connected to it - Google Patents

Abstract

FIELD: power industry.

SUBSTANCE: quick operation pressure reducing and desuperheating station is connected to the scheme of turbine plants, and steam receiving device is provided in condenser of connected turbine, through which the exhaust steam can be discharged from turbine with back pressure to condenser of connected turbine. First, condensation plant of connected turbine is started. Then, turbine with back pressure is turned and steam is discharged to condenser of connected turbine, and connected turbine is pre-loaded. Its complete loading is performed at simultaneous automatic load increase of turbine with back pressure under action of its back pressure control.

EFFECT: invention allows providing the possibility of starting two turbines irrespective of availability of consumers of waste steam in turbine with back pressure, as well as simplifying the number of start-up operations and accelerating the start-up of those turbines owing to their simultaneous loading.

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Description

The invention relates to the field of power engineering and can be used at combined heat and power plants (TPPs), where backpressure turbines (types “P”, “PR”, “TR”, “PTR”) and turbines connected to them (crushed steam turbines) are installed. The technical result achieved by the claimed invention is the possibility of a joint launch of both turbines.

There is a method of separate start-up of these turbines, in which the counter-pressure turbine is first launched, and then the turbine is turned on (see, for example, S.M. Losev. Steam turbines and condensing devices. Theory, design and operation. - 8th ed. , revised. - Moscow: Gosenergoizdat, 1954, p. 275-276; A.D. Trukhny. Stationary steam turbines. - 2nd ed., revised and extended - M .: Energoatomizdat, 1990, p. 575-583).

A preliminary start-up of the turbine with back pressure is possible with the discharge of exhaust steam into the station manifold. The disadvantage of this start-up option is the impossibility of its implementation in the absence or very small (less than the steam consumption at the turbine exhaust with backpressure at its initial load) external steam consumption from the collector.

It is also possible to start a counter-pressure turbine, in which steam from its exhaust pipe is sent to the high-pressure heater (LDPE) of this turbine, and switching to the collector occurs later (see, for example, B. Kapelovich. Operation of steam turbine plants. - 2- ed., revised. - M .: Energoatomizdat, 1985, p. 38-39). The disadvantage of this start-up option is its complexity, including the need to discharge the condensate of the LDPE heating steam into the condenser of an adjacent operating turbine.

The disadvantage of both of these start-up options is that the connected turbine starts after the backpressure turbine, which lengthens the total start-up time of both turbines.

The objective of the invention is the joint start of the turbines, providing the ability to start the turbine with back pressure regardless of the presence of external steam consumers from the station collector, as well as simplifying the start of both turbines and reducing the total time of their start.

To solve the proposed problem of joint start-up of two turbines, the BROU 6 is included in the scheme of their turbine units (see drawing), through which the steam from the exhaust pipe of the turbine with back pressure (connecting steam pipe between the turbines) can be discharged into the steam receiver of the correspondingly selected condenser when the turbine is turned on.

Schematic diagram of turbine units contains the following equipment and devices:

1 - turbine with back pressure;

2 - an included turbine (crushed steam turbine);

3, 4 - cooling device of a turbine with back pressure;

5 - condenser of the connected turbine;

6 - high-speed reduction and cooling installation (BROU);

7, 8 - main steam valve (GPZ) of the included turbine;

9, 11, 13 - stop valve;

10, 12, 14 - control valve;

15 - back pressure regulator of a turbine with back pressure;

16 - pressure regulator BROU "to yourself";

17 - collector.

The method is as follows.

The condensing unit of turbine 2 is started. Preliminary:

a) close the valves 20-23 on the steam lines connecting the exhaust of the turbine 1 and the steam inlet of the turbine 2 with the collector 17;

b) open the valves 18, 19 on the steam lines, through which steam from the turbine 1 is supplied directly to the turbine 2;

c) open the valves 24, 25 on the pipelines for the discharge of exhaust steam from the turbine 1 through BROU 6 into the steam receiving device of the condenser 5;

g) include a starting oil pump of the turbine 2 (not shown);

d) include a shaft-turning device of the turbine 2 and feed steam into its end seals.

The BROW 6 is fully opened, not including its regulator 16. Then, in the usual manner, the turbine 1 is prepared for start-up and its push, turn, synchronization and initial loading are performed.

All this time, the steam from the backpressure line of the turbine 1 is discharged into the condenser 5 of the turbine 2. BROW 6 and the steam receiver of the condenser 5 are calculated (selected) for the steam flow rate required to take the initial load of the turbine 1 (approximately 10% of the nominal load at the nominal back pressure). Therefore, as the above starting operations are performed, the pressure at the exhaust of the turbine 1 rises gradually, which ensures a “soft” heating of the metal.

After the turbine 1 has accepted the initial load, turn on the regulator 16 at the BROW 6, open the valves 11-14 of the turbine 2 and bypass the gas treatment plant 7, 8 push, rotate, synchronize and initial load at the nominal pressure of the crushed steam. After switching to GPZ 7, 8, turbine 2 is loaded without increasing the load of turbine 1 until BROU 6 is completely closed under the action of controller 16.

Turn on the regulator 15 of the turbine 1. Turn off the regulator 16 at the BROW 6 and continue to load the turbine 2 to the required load. In this case, the turbine 1 is automatically loaded under the action of its regulator 15. During this period, the loading of the turbine 2 is carried out at a speed provided for by the start schedule of the turbine 1, which operates with steam of higher parameters and has a more massive cylinder.

Claims (1)

A method of starting a counter-pressure turbine and a turbine connected to it, characterized in that the two turbines are started up jointly due to the BROU turbine installation provided for in the circuit, and after the back-pressure turbine has taken the initial load, the regulator at the BROU is turned on, the stop and control valves are opened and bypass the main steam valve (GPZ) of the connected turbine by pushing, turning, synchronizing and initial loading at the nominal pressure of crushed steam, after switching to GPP the switched-on turbine is loaded without increasing the load of the counter-pressure turbine until the BROW is completely closed under the action of the regulator.

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