SU1386720A1 - Method of arresting a steam-turbine power standby unit - Google Patents

Description

(21) 4140868 / 24-06i

(22) 10/29/86

(46) 04/07/88. Bul № 13

(71) Ural Polytechnic Institute. CM. Kirov

(72) V.L. Pohoriler

(53) 621.165 (088.8)

(56) Typical instructions for starting up from various thermal states and stopping a double unit with a capacity of 300 MW. M .: SUNT, Energonot ORGRES, 1972, p. 30-33, 47.

(54) METHOD FOR STOPPING THE POWER-TURBINE ENERGY DOUBLE-BLOCK

(57) The invention makes it possible to shorten the duration of the turbine cooling down. Steam consumption through steam reheater 30 is maintained.

disabled boiler 1, for which, acting on the valves 46, 47 close the fuel supply through lines 44 and 45, then close the valve 9 and the valve 7. Then reduce the steam output of the boiler 2, affect the valves 8.9 of the feed water and valve 46, 47, up to 30-40% of the nominal load, after which the intermediate superheater 29 of the boiler 2 is switched off with the help of the valves 27 and the valves 35 are closed. The rate of reduction of steam steam ahead of the cylinder. 39, the average pressure of the turbine and the disconnection of the superheater 29 regulate the outcome of maintaining the reliability indicators of the average pressure cylinder of the turbine in the range of acceptable values. 1 il.

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The invention relates to a power system and can be used in the operation of steam turbine double units, including two boilers and one turbine.

j The aim of the invention is to reduce the duration of the cooling bed and the turbine.

: The drawing shows a steam turbine power double block. j The double block includes two identical steam boilers 1 and 2, to which are connected the main line 3 from the pipeline: A and 5, valves 6 and 7, regulating supply valves 8 and 9 and devices 10 and 11 for measuring the feed flow rate water. The double block also contains starting assemblies 12 and 13 with integrated valves 1A and 15 of device 16 and 17 starting injections, steam lines 18 and 19 having the main steam valves 20 and 21 and blocks 22 and 23 of steam distribution valves on the cylinder 24 of the high pressure turbine pressure turbines, steam lines 25 and 26 with valves 27 and 28, intermediate steam heaters 29 and 30 connected by steam lines 31 and 32 to injection devices 33 and 34 with valves 35 and 36, to stop valves 37 and 38 of cylinder 39 medium pressure (CCD) and low pressure cylinder 40 (LPC) of the turbine with an electric generator 41 Me- gavattmetrom 42 connected to konEensatoru 43, the boilers 1 and 2. By connecting the line 44 and 45 with 46 and 47 advizhkami.

The method for stopping the steam turbine power double block is carried out as follows.

Boilers 1 and 2 are unloaded to reduce fuel consumption in lines 44 and 45, cover valves 46 and 47, and valves B and 9 are closed and reduce the flow of feed water, it is controlled by instruments 10 and 11; the water flow rate is maintained the same for both boilers 2 and 1. As the load decreases, the fresh steam temperature behind the devices 16 and 17 is kept constant, while the temperature of the secondary superheated steam behind the intermediate steam superheaters 29 and 30 after the devices 33 and 34 is reduced. ) a 41 55-60% of nominal reduce the temperature of the secondary superheated steam,

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On the injection devices 33 and 34 and other means of controlling the temperature of the secondary superheated steam. The rates of change of parameters are selected in such a way as to observe the conditions of reliability of the turbine; after exhaustion of possibilities to reduce the temperature of the intermediate overheating steam, one of the boilers 1 and 2, for example, boiler 1, is shut off, for which, by acting on the valves 46 and 47, the fuel supply is shut off through lines 44 and 45; thereafter, the valve 9 and the valve 7 supplying feed water to the boiler 1 are closed, the valves 21 on the fresh steam pipe 19, and the valves 28 and 36 are left open. At the same time, steam after CVP 24 is directed to both steam lines 25 and 26 and further through intermediate steam superheaters, 29 (operating boiler) and 30 (boiler off), after which they are mixed before turbine CCD 39, which reduces the temperature of the steam before CCD 39. I

After that, the boiler output 2 is reduced by affecting the feedwater valves 8 and 9 and the valves 46 and 47 to 30-40% of the nominal, and then the intermediate superheater 29 of the boiler 2 is turned off using the valve 27 and the valves 35 are closed. the steam temperatures in front of the turbine CSD 39 and the shutdown of the intermediate superheater 29 of boiler 2 regulate the outcome of maintaining the reliability indicators of the turbine CSD 39 in the range of permissible values, and the steam capacity of boiler 2 is kept constant throughout sa cooldown.

Claims (1)

Invention Formula The stopping method of the pa: rotary twin power unit with an intermediate superheater of boilers by simultaneously reducing fuel consumption for boilers and fresh and secondary superheated steam parameters and shutting down one of the boilers, characterized in that, in order to reduce the duration of turbine cooling, steam consumption is maintained the intermediate superheater of the disconnected boiler, produced a further reduction of 3 RJ867204. the fuel stroke ii par-1 meter is the steam of the boiler and the supply of the entire flow of the boiler to the next, followed by the steam being disconnected through the intermediate of its intermediate steam reheater to the boiler superheater.