SU889871A1

SU889871A1 - Steam turbine control system

Info

Publication number: SU889871A1
Application number: SU802901531A
Authority: SU
Inventors: Михаил Михайлович Волынский; Анатолий Владиславович Лякин; Валерий Николаевич Проскуркин; Вадим Михайлович Фишер
Original assignee: Харьковский Филиал Центрального Конструкторского Бюро "Главэнергоремонта"
Priority date: 1980-03-31
Filing date: 1980-03-31
Publication date: 1981-12-15

Description

1one

Изобретение относитс к теппоэнерге тике и может быть использовано при регулировании паровых турбин.This invention relates to tepopenergie and can be used in the regulation of steam turbines.

Наиболее близкой к предлагаемой по технической сущности и достигаемому ре-, зультату вл етс система регулировани паровой турбины, содержаща сервомоторClosest to the proposed technical essence and the achieved result, the result is a steam turbine control system containing a servo motor

с отсечным золотником, импульсную ЛЙ1with shut-off valve, pulse LY1

нию, подсоединенную к одной из торце-г вых камер отсечного :золотника, вклю ченные в эту линию датчик скорости, компенсационный дроссель и дроссели обрат ных св зей . сервомотора и золотника, задатчик и дроссель изменени неравномерности , механически соединенные с компенсационным дросселем 1.connected to one of the butt-end chambers of the shut-off: spool, included in this line is a speed sensor, a compensation throttle and feedback chokes. servomotor and spool, control unit and choke change unevenness, mechanically connected to the compensation choke 1.

Известна система характеризуетс пониженной точностью регулировани .The known system is characterized by reduced control accuracy.

Цель изобретени - повышение точности регулировани .The purpose of the invention is to improve the accuracy of regulation.

Дл достижени поставленной цели а системе регулировани паровой турбины дроссель изменени неравномерности гидравлически подключен ко второй торцоВОЙ камере золотника, а дроссели обратных св зей включены в импульсную пинию между собой параллельно, а по отношению к датчику скорости - последовательно .To achieve this goal, in the steam turbine control system, the irregularity variation choke is hydraulically connected to the second face of the spool chamber, and the feedback chokes are connected in a pulsed pin parallel with each other, and in relation to the speed sensor in series.

На чертеже приведена схема предлагаемой системы регулировани .The drawing shows the scheme of the proposed control system.

Claims

The rotor speed sensor 1 of the steam turbine is connected by a pulse line 2 to the first end chamber 3 of the shut-off spool 4 of the servomotor 5, on the piston 6 of which the feedback choke 7 of the servo motor is fixed. The choke 7 is connected to the pulse line 2 parallel to the choke 8 of the feedback of the shut-off valve 4 and subsequently with the speed sensor 1. The compensating choke 9 and the choke 1O of the change in non-uniformity are fixed on one rod connected to the unit of degree 11 non-uniformity. Additional line 12 throttle Yu is connected to the second end chamber 1 -th gate valve 4, located 3 opposite the chamber 3, and through the throttle diaphragm 14 - to the collector 15 for supplying the working fluid. When the unit 11 moves the drossols 9 and 10 due to the outlined flow rate of the tank through the throttle Yu, the pressure in the line 12 and, accordingly, in the chamber 13 under the spool 4 changes. At the same time, by changing the cross-sectional area of the throttles 9, the pressure in the impulse line 2 and the chamber 3 above the spool 4 is changed. The cross-sectional areas of the throttles 9 and 10 are selected so that the pressures in chambers 3 and 13 change by the same amount, which ensures compensation of the tuning level (independence of the position of the spool 14 and servomotor 5 from the effects of sensor 3). The change in pressure in the pulse line 2 at a constant position of the sensor 1, spool 4 and piston 6 leads to a change in the degree of irregularity of the control system. Thus, as the pressure in the line increases, the efficiency of the throttles 7 and 8 decreases, and the efficiency of the throttle cross section connected to the speed sensor 1 increases. Thus, the degree of unevenness of the regulation system reduces c (the specified movement of the piston 6 of the servo of the motor corresponds to a smaller movement of the sensor 1 and, consequently, to a smaller change in the rotation frequency of the turbine rotor). Since the gains of parallel-connected chokes of negative feedback between the servo and the spool vary in the same way as the pressure in the line changes, the ratio from the servo to the spool does not change. Investigator KO1, maintains the rigidity of the servomotor with respect to the external load applied to the piston of the servomotor. Thus, when the degree of unevenness changes, the initial accuracy of the control system is preserved. Some decrease in the permutation effort of the gaill on the regimes with a reduced pressure in the impulse line, as experience in operating turbines with pressure lines shows, is insignificant and can be compensated, if necessary, by giving the spool a rotary motion. Claims The steam turbine control system comprising a servo motor with a shut-off valve, a pulse line connected to one of the end chambers of the shut-off spool, a speed sensor included in this line, a compensation throttle and servo-and slide valve chokes, a control unit and a choke for changing the unevenness, mechanical - Kie connected to the compensation of the TSOSEL, characterized in that, in order to improve the accuracy of the regulation, the choke change irregularity is hydraulically connected to Ora end face of the spool chamber and chokes obratnk bonds included in the control line in parallel with each other and with respect to speed sensor - sequentially. Sources of information taken into account in the examination 1. USSR author's certificate N9 399611, cl. F01D 17/26. 1971.