SU918456A1 - Method of supporting power unit in hot reservoir - Google Patents

Description

I

The invention relates to a power system and can be used in the operation of power units of thermal power plants under conditions of rapidly varying load schedules.

There is a known method of maintaining a power unit in a hot reserve by supplying steam from an external source to the primary and secondary superheaters in front of the steam and inlet paths of high and medium pressure cylinders with tapping and removing steam from the superheaters when the turbine is running in engine mode and cooling its flow part 1.

The purpose of the invention is improving the reliability and efficiency of the method.

This goal is achieved by additionally supplying steam from an external source to the steam inlet ducts and front end seals of high and medium pressure cylinders, the steam flows after the superheaters are mixed together

And it is fed to the cooling of the flow part of the turbine by two streams, one of which is directed to the selection of a medium pressure cylinder, and the other is pre-cooled, to the entrance of a low pressure cylinder.

A schematic diagram of the power unit for the implementation of the proposed method is presented on the four-minute basis.

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Claims (1)

The power unit contains a pipe 1 for supplying steam from an unauthorized source to the steam pipelines 2 of fresh steam connected to the primary steam superheater 3 of the boiler, the inlet of which is connected to a discharge line 5 with a valve 6 connected to the secondary steam superheater 8 of the steam boiler 8 by means of a 15 C line. The secondary steam superheater 8 by steam 20 by wires 9 of secondary superheated steam through the steam inlet duct, including stop and control valves 10 and 11 of medium pressure, is connected to the cylinder 12 of the medium pressure (DSC) of the turbine. The power unit is equipped with an additional reduction and cooling unit 13 (DOC) connected between the inlet steam line 7 of the secondary steam superheater 8 and the overflow pipes 1 to the low pressure cylinder 15 (LPC) The primary steam superheater 3 (through steam lines 2 of fresh steam and the steam inlet path including the main steam valves 16 ( GPP), stop and control valves 17 and 18 high pressure,: in conjunction with the cylinder 19 high pressure (CVP) of the turbine. CVP 19 and CSD 12 have front seals 20, and 21. A steam supply pipe 22 from an external source is connected to the steam lines 9 of the secondary superheated steam, and a cooling steam supply pipe 2 is connected to the steam extraction pipe 23. The nozzles 25 are connected to the bypass pipes, and the latter and the R. OTs 13 are provided with a protective device that prevents water from entering the low-pressure cylinder 15 (the device is not shown in the drawing). To ensure the operation of the power unit in reserve with maintaining thermal condition, it is necessary to quickly load the load, fresh steam from a foreign source, for example, from a nearby operating unit, through pipeline 1 by steam flows steam into the steam lines 2 of fresh power unit, which is stopped in reserve. This steam reverses the primary steam superheater 3 of the boiler and via the outlet line k (with the valve 6 closed) enters the steam inlet pipe 7 of the secondary steam superheater 8. In parallel, fresh steam is supplied to heat the steam lines 2 of the fresh steam gas plant 1b, stop valves and regulating valves. -nov 17f 18 TsVD 19 and, if necessary, for ventilation (cooling) TsVD 19 turbines operating in engine mode. After warming the steam lines 2 of the fresh steam turbine and gas processing unit 16, the steam enters the front seals 20, 21 of HPC 19 and DSCD 12. Steam 9 of the secondary superheater of the operating power unit is supplied to the steam supply lines 9 of the secondary superheated steam stopped in the power unit reserve. This steam reversely passes the secondary superheater 8 and enters the inlet steam line 7 of the secondary steam superheater 8. At the same time, the secondary steam from the operating unit is directed to warm the steam lines 9 of the secondary superheated steam stop valves and control valves 10, 11 of the DSC 12. After the primary and secondary steam superheaters. 3 and 8 pairs mixed in the inlet steam line 7 of the secondary superheater 8 are fed to the cooling of DSC 12 and LPC 15 heated by the turbine in engine mode. The cooling steam is directed either to the Drum 12 of the DSC 12 and in parallel through the DOC 13 in the bypass pipes I between the DCP 12 and the low-pressure cylinder 15, or only into the steam extraction line 23, and the feed water with the saturation temperature is injected into the bypass pipes k and is sprayed with the help of nozzles 25. Thus, the boiler is kept hot in the reserve by supplying steam from the A third-party source (along with the heating of the steam inlet duct of the high-pressure cylinder and the central circuit pump with the use of waste from the boiler to cool the flow part) ensures reliable operation of the power unit in the hot reserve. The use of waste steam and the subsequent reduction in the duration of the start-up of the power unit increases efficiency and maneuverability. The Invention Method for maintaining a power unit in a hot reserve by supplying steam from an external source to the primary and secondary boiler superheaters in front of the steam and inlet paths of high and medium pressure cylinders with Exhausting and removing steam from the superheaters during turbine operation in engine mode and cooling of its flow section, L and h and y and the fact that, in order to increase its reliability and efficiency, additional steam is supplied from an external source to the steam inlet ducts and the front end seals wood of high and medium pressure steam flows after superheaters are mixed together and fed to the cooling turbine flowing part two streams, one of which is fed to selection medium cylinder 5 6 pressure, and the other, previously 1, Tugov A.I. The study is technologically cooled, - an ortan block is placed at the entrance of a low-pressure cylinder with a drum pressure, a boiler in a hot reserve. VTI report  Sources of information to them. F.E. Dzerzhinsky. M., 1980, taken into account in the examination 5 s. 19 fig. 1 (prototype). HV s t-no