SU1268753A1 - Thermal power plant - Google Patents

Abstract

The invention relates to the field of power engineering and improves the efficiency and reliability of the power plant in low-steam mode. The steam inlet pipe 20 of the steam converter (P) 18 is additionally connected to the steam collector (PC) 12 of medium pressure. A PC 13 of a cylinder 5 of high pressure turbine blocks are connected between hot reheat pipes. This embodiment allows reducing steam consumption, for example, on the unit with boiler 1, opening valves (k) 29 and 34 to supply additional steam from PC 12 medium pressure in P 18, and from there to the cooling of the low pressure cylinder 9. If the vapor pressure in PC 12 does not provide the required performance of the P 18, open the valve 31 on the PC 11 high pressure, and K 34 close. With increasing load on the block, (L closing the corresponding K, is removed from the work of P 18. 1 ill. Isd F 00 h SP 00

Description

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This invention relates to thermal power engineering and can be used on thermal steam turbine power plants.

The purpose of the invention is improving the efficiency and reliability of the power plant in low-steam mode.

In principle there is a schematic diagram of a thermal power plant.

The power plant contains energy blocks containing boilers 1 and

2 with intermediate superheaters

3 and 4 between high pressure cylinders 5 and 6 and the cylinders 7 and

8 medium pressure (DCP), as well as low pressure cylinders 9 and 10 (low pressure cylinders) and high, medium and low pressure steam manifolds 11-13, while high pressure steam collector 11 is connected between the hot reheat piping 14 and 15, which are connected to the intermediate superheaters m 3 and 4, and the data processing centers 7 and 8, the intermediate superheaters 3 and 4 by the pipes 16,17 of cold reheat are connected to the high-pressure cylinder 5 and 6.

The device for producing cooling steam is made in the form of a steam converter 18, a steam-separating pipe (secondary steam pipe) 19 of which is connected to a low pressure steam collector 13, and a steam inlet pipe (primary steam pipe) 20 of the high pressure steam collector 11. The steam inlet pipe 20 of the steam converter 18 is additionally connected by a steam line

22k to medium pressure steam manifold 12. Low pressure gift manifold 13 is equipped with valves

23 and 24 is connected between receivers 25 and 26 and connected to LPCs 9 and 10 by pipes 27 and 28, on which valves 29 and 30 are installed. High and medium pressure free collectors 11 and 12 are equipped with valves 31, 32 and 33, 34,

The steam converter 18 is equipped with pipelines 35 and 36 for condensate drainage and water supply, as well as a device 37 for supplying condensate of its primary steam to the cavity 38 for receiving secondary steam, which is connected by condensate to the feed water of chemically purified water.

68753I

The power plant works as follows.

When the steam consumption decreases, for example, on the unit with the boiler 1 and re-commissioning its low-pressure cylinder 9 to low-steam mode, valve 29 opens on line 27. Then valve 34 opens on the steam manifold 12 of the average pressure from the low-pressure manifold 8 and steam from the steam collector 12 the steam line 22 and the steam inlet pipe 20 are supplied to the steam converter 18, to which water is supplied via the pipe 36. The steam entering 15 into the Steam Converter 18 from the average-pressure steam manifold 12 condenses therein, generating dry saturated steam. The condensate of this steam through line 35 is diverted 20 to the heat recovery system per round. bins (not shown), and the resulting steam through the steam supplying pipe 19 enters the low-pressure steam manifold 13 and through the valve 29 25 is supplied to cool the low-pressure cylinder 9. At the same time, to obtain steam in the steam converter 18, condensate turbines can be fed through pipe 36 or chemically 3Q purified water, or through the device 37 - condensate of the heating steam of the steam converter itself 18.

The increase in the amount of steam delivered from the steam converter 18 is accomplished by increasing the opening degree of the valve 34. Moreover, if the steam pressure in the steam manifold 12 does not provide the required performance of the steam generator Q for the secondary steam generator 32, the valve 32 on the steam one opens. high pressure manifold 11. and valve 34 is closed. If an increase in the temperature at the inlet of the LPC 5 is observed in the receiver 23, then the valve 23 opens to the necessary degree. At the same time, the steam generator 18 increases the distillate to: perform up to additional condensate losses.

50 "

When the load on the power unit with boiler 1 is increased, valve 23 first closes, and then valve 32 gradually closes and with valves 31, 32 and 33 completely closed, valve 29 closes and thus the steam converter 18 is completely removed from operation. When switching to low steam operation

another block in this way operate with valves 31, 33,24 and 30

Claims (1)

Invention Formula A thermal power plant containing energy blocks, each of which has a boiler and a turbine with high, medium and low pressure cylinders, an intermediate superheater connected by a cold reheat pipeline to a high pressure cylinder 1, to a hot reheat pipe, to a medium pressure cylinder, steam manifolds connecting the corresponding cylinders pressure 2687534 turbine units, and a device for producing cooling steam, the steam and steam supply pipes of which are connected to low and high pressure steam collectors, respectively, characterized in that, in order to increase efficiency and reliability, 10 steam is made in the form of a steam converter, the steam inlet pipe of which is additionally connected to the steam manifold of medium pressure, and the steam collectors of cylinders of high pressure of the turbine blocks of the blocks are connected to hot reheat heating pipes.