RU2422645C2 - Control method of turbines with back pressure and actuated at load drop - Google Patents

Abstract

FIELD: engines and pumps.

SUBSTANCE: after drop of load from generator of one of turbines or simultaneously from both of them, turbines do not stop but continue operating either in idle mode or with small load, owing to pressure control of quick operation and pressure reducing and desuperheating station (QOPRDS) provided in the diagram of turbine sets, as well as the appropriate turbine pressure controls. Waste steam can be discharged through QOPRDS from the turbine with back pressure to the provided steam receiving device of condenser of the actuated turbine.

EFFECT: possibility of keeping two turbines in operation, either in idle mode or with small load, at the load drop from generator of one of them or both of them.

1 dwg

Description

The invention relates to the field of power engineering and can be used at combined heat and power plants (CHP), where backpressure turbines (types "P", "PR", "TR", "PTR") and turbines connected to them (rumpled steam turbines) are installed, operating direct coupled.

The technical result achieved by the claimed invention is the ability to save turbine data in operation when the load is removed from the generator of one of them or both at once, and also to quickly restore in this case the required power on the units.

Applicants are not aware of the use in science and technology of the distinguishing features of load shedding from a backpressure turbine and / or a turbine connected to it to obtain the indicated technical result.

The objective of the invention is to eliminate the need for shutdown of both turbines when dumping the load from the generator of one of them or simultaneously from two.

To solve this problem, a method is proposed for joint control of a backpressure turbine and a turbine connected to it during load shedding, in which, after shedding the load from the generator, one of them or simultaneously from both turbines does not stop, but continues to operate either in idle mode or with a small load, due to the pressure regulator of the BROU provided in the turbine installation scheme, through which the exhaust steam from the backpressure turbine can be discharged to the provided steam reception device your condenser of the connected turbine, as well as the corresponding pressure regulators of the turbines.

To solve the proposed problem of joint control of turbines:

a) BROU 6 is included in the turbine installation diagram (see drawing), through which the steam from the exhaust pipe of the turbine with a back pressure (connecting steam line between the turbines) can be discharged into the steam receiver of the correspondingly selected condenser of the connected turbine;

b) BROW and the included turbine have steam pressure regulators "to themselves";

c) BROW and condenser receiving device are calculated (selected) for the steam flow rate required to take the initial load of the backpressure turbine (approximately 10% of the rated power at the rated backpressure).

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 - pressure regulator "to itself" of the included turbine;

18 - back-pressure turbine generator;

19 - generator turbine included.

The invention covers three cases: load shedding from generator 18, load shedding from generator 19, simultaneous load shedding from generators 18 and 19.

1. When dumping the load from the generator 18:

- the speed controller of the turbine 1 (not shown in the diagram) puts it in idle mode, "overpowering" the command of the back pressure controller 15;

- the pressure regulator 17 “to itself” of the turbine 2 covers its control valves, restoring and maintaining the nominal steam pressure in front of the turbine 2. Its load quickly decreases, but not to zero, since the idle flow rate of the turbine 1 at nominal back pressure allows you to save some power;

- if necessary, cooling devices 3 and 4 are switched on.

2. Upon the load shedding from the generator 19:

- BROW 6 fully opens without turning on its pressure regulator 16 "to itself";

- the speed controller of the turbine 2 (not shown in the diagram) puts it in idle mode. In this case, the back pressure regulator 15 remains in operation, and the turbine 1 continues to carry a certain load, determined by the total steam flow through the BROW and into the turbine 2.

3. With a simultaneous load shedding from generators 18 and 19:

- BROU 6 opens with the pressure regulator 16 “on” to itself;

- speed controllers for turbines 1 and 2 (not shown in the diagram) put them into idle mode. The excess steam from the turbine 1, not consumed by the turbine 2 due to the difference in the idle flow rate, is discharged through the BROU 6 to the condenser 5. The pressure in front of the turbine 2 (and in the back pressure line) remains nominal.

- if necessary, cooling devices 3 and 4 are switched on.

Claims (1)

A method of joint control of a back-pressure turbine and a turbine connected to it during load shedding, characterized in that after the load shed from one of the generator or simultaneously from both the turbines do not stop, but continue to operate either in idle mode or with a small load due to the pressure regulator for the BROU provided in the turbine installation scheme, through which the exhaust steam from the backpressure turbine can be discharged to the provided condenser receiving device of the connected Rbin and respective pressure regulators at the turbines.

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