SU1240922A1 - Method of determining tightness of cut-off and control valves of steam turbines - Google Patents

Description

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1240922

The invention relates to a power system and can be used on thermal power plants with boiler-turbine power units having one or several intermediate superheatings.

Porn and control valves 9 and 10 of medium pressure, respectively, in cylinders of medium 6 and low 7 pressure, and then discharged to condenser 11. Through line 12 with fittings 13 pairs after line 8

The purpose of the invention is to reduce the reheat 5 time in condensation, simplify the circuit and increase reliab 11 besides cylinders b and 7 of average and turbogenerator while controlling low pressure valves, respectively, from the mountain of average pressure of the steam pipe 14 of the tract 8 After kindling

The drawing shows schematically the accelerator 1, an increase in the pressure of an acute steam, which implements the proposed method for determining the density of the stop and control valves of steam turbines.

A device that implements the proposed method, when supplying steam from boiler 1, contains a steam line 2 with steam installed with valves 3 and 4 to a value equal to the set value, opening valves 3 and 4 with valves 9 and 10 closed, supplying steam to high-pressure cylinder 5 and through steam line 14 tract 8 of reheat and line 12 with armature 13 discharges steam after the cylinders and a high-pressure regulator 15 are pushed into the condenser 11.

high pressure valves 3 and 4, respectively, connecting the boiler 1 with a steam turbine having cylinders 5, 6 and 7 high, medium and low pressures respectively, and intermediate line 8, then close valve 13 on line 12, raise steam pressure before controlled valve 9 or 10 average pressure to a value equal to the pressure in front of valves 3 or 4. In case of violation of the steam trap heating with the check valve 9 or 10 under control and the control valve 9 and 10 of medium to medium pressure, the steam flowing pressure therethrough, respectively. A capacitor 11 is connected to the leakage cylinder 7, falling into the low-pressure part of the low-pressure section, and the average – to-medium pressure leads to a measurement connected to line 12 with reinforcement of the rotor speed. This frequency 13, connected to the hot steam pipe 1425, is measured and compared to the permissible (reference 8 tract overheating), and the difference between these frequencies determines whether the leakage density is determined. When checking valves 3 or 4, valves are realized as follows: high-pressure valves close these valves, open the valve 13 on line 12 at a time, provide the reheat 8 line, raise

The hot steam from boiler 1 is supplied by pa-zo pressure in front of the controlled valve 3

The conduit 2 to the high-pressure stop-stop or 4 installed on it compares the rotational speed of the turbine shaft with the permissible and control valves 3 and 4 and the leakage through valve 3 or 4, which is permissible and the difference of these frequencies.

pressure, respectively, to the high pressure cylinder 5. After that, the steam is fed into the reheat section 8 and through the stop and control valves 9 and 10 of medium pressure, respectively, into cylinders of medium 6 and low 7 pressures, and then dumped into condenser 11. Through line 12 with fittings 13 pairs after path 8

reheating can be discharged into condenser 11 in addition to cylinders b and 7 of medium and low pressures, respectively, from the hot steam line 14 of route 8. After kindling

 boiler 1, steam pressure increase

before valves 3 and 4, to a value equal to a predetermined, opening valves 3 and 4, with valves 9 and 10 closed, supply steam to the high pressure cylinder 5 and steam line 14 of the reheat section 8 of the reheat section and line 12 with fittings 13 release steam after the high pressure cylinder 5 to capacitor 11.

5 high pressure to condenser 11.

Then close the valve 13 on line 12, raise the vapor pressure in front of the controlled valve 9 or 10 medium pressure to a value equal to the pressure in front of the valves 3 or 4. In the case of violation of the density of the controlled valve 9 or 10 average pressure, the steam flowing through the leakages into the flow a part of the cylinder average pressure leads to a change in the frequency of rotation of the rotor. This frequency is measured and compared with the permissible (reference) frequency, and judging by the difference between these frequencies, leakage is judged. When controlling valves 3 or 4 of high pressure, close these valves, open the armature 13 on line 12, provide the reheat 8 line, raise

with permissible and by the difference of these frequencies, it is judged that there are leaks through valve 3 or 4.

Claims (2)

1. METHOD OF DEFINITION DENSITY OF STOP AND CONTROL VALVES OF STEAM TURBINES with high, medium and low pressure cylinders and overheating paths by supplying steam to a closed controlled valve, increasing the pressure in front of it to 1240922 A1 of a predetermined value, measuring the rotational speed of the turbine shaft at this pressure and comparing with the permissible frequency, characterized in that, in order to reduce the check time, simplify the circuit and increase the reliability of the turbine unit when monitoring medium-pressure valves, when the high pressure is reached in front of the valves equal to the set one, they support it, and steam is supplied to the controlled valve through the high-pressure cylinder until a pressure is created in front of it, equal to the pressure in front of the high-pressure valves. 2. The method according to π. 1, characterized in that, in order to eliminate the influence of leaks through the medium pressure valves during the control of high pressure valves, the steam after the high pressure cylinder is discharged in addition to the medium and low pressure cylinders.