SU1222899A2 - Anti-stalling and surging protection of compressor plant - Google Patents

Description

The invention relates to the protection of compressors against surge and is an improvement of the known system according to the author. St. No. 1086229.

The purpose of the invention is to increase the reliability of the compressor unit.

The drawing shows a block diagram of the system.

The anti-surge protection system of a compressor unit driven by a gas turbine engine contains a gas pressure sensor 1 at the inlet and a gas pressure sensor 2 at the outlet of compressor 3 equipped with a protective grid 4, a differential pressure sensor 5 on the protective grid, a soft gas bypass regulator 6 and a regulator 7 gas relay bypass, valve 8 for emergency fuel cut-off, gas soft bypass valve 9, gas relay 10 bypass valve, compressor rotor sensor 11, compressor rotor turns 11, computer 12, logical terminal Figure 13, the compressor rotor speed regulator 14 and the fuel valve 15, as well as the dividing unit 16, the gas temperature sensor 17 and the gas temperature setting unit 18 at the compressor outlet, and the comparator 19. In addition, the power turbine 20 of the gas turbine engine, the first adder 21, the second adder 22, the functional converter 23 and the setting unit 24 included in the calculator, the first amplifier 25, the first trigger module 26 and the first feedback module 27 included in the smooth-bypass controller, the third adder 28, second amplifier 29, in The trigger module 30, the second feedback module 31 and the fuel valve actuator 32 included in the compressor rotor speed controller, first, second, third and fourth circuit AND 33-36, first circuit OR 37, HE 38, drive 39 of the relay gas bypass valve, the soft gas bypass valve actuator 40, the switching unit 41 and the second OR 42 circuit included in the logic unit, as well as the air compressor 43, the combustion chamber 44 and the gas turbine engine 45.

The system works as follows. When the compressor unit is operating in mode 1 and 2, the gas pressures are measured at the inlet and outlet of compressor 3. According to the signals from sensors 1 and 2, a signal is generated at the output of dividing unit 16 corresponding to the compression ratio of the compressor. In the calculator 12, according to the signals of the dividing unit and the sensor 11 rotor turns, the editor is N. Bobkov Order 1689/35

Compiled by A. Baryshnikov Tehred I. VeresKorrektor A. Tsko

Circulation 586 Subscription

VNIIPI USSR State Committee

but inventions and discoveries

113035, Moscow, Zh-35, Raushsk nab. 4/5

Branch PPP "Patent, Uzhgorod, st. Project, 4

presso.ra determines the position of the operating point on the gas-dynamic characteristic of the compressor, i.e. the mode of operation of the compressor.

When the compressor operation mode changes and the operating point is shifted beyond the pre-surge limit, the error signal from the output of the first adder 21 of the calculator 12 is fed to the inputs of the first amplifier 25 of the regulator 6 and the switching device 41 of the logic device 13. In the absence of the input the signal 14 to reduce the rotor speed of the compressor (from the output of the second trigger module 30) logical device 13 connects the output of the regulator 6 to the actuator 40 of the valve 9, thereby realizing a smooth gas bypass.

With a further change in the operating mode of the compressor and the displacement of the operating point beyond the maximum permissible boundary boundary, the error signal from the output of the second adder 22 of the calculator 12 is fed to the input of the regulator 7, the second circuit 34 and its output to the actuator 39 of the valve 10, realizes the relay gas bypass.

With prolonged gas bypass from the exit to the compressor inlet, the bypass gas is gradually heated due to the high compression ratio of the compressor and small sections through which the gas is bypassed. Sensor 17 measures the gas temperature at the outlet of the compressor. The output signal of the sensor 17 is fed to the input of the comparator 19, in which the signal of the sensor is compared with the signal of the setpoint 18 of the maximum permissible gas temperature at the outlet of the compressor. When the signal level of the sensor 17 exceeds the signal of the setting device 18, the output of the comparator 19 generates a signal at the input of the second circuit OR 42 of the logic device 13. This signal at the output of the second circuit OR 42 produces a blocking signal of the drives 39, 40 and 32 and cut off the fuel by close the valve 8, resulting in an emergency stop of the compressor unit.

Emergency shutdown of the compressor installation also occurs when the input of the logic device 13 arrives at the signal from the sensor 5, which corresponds to the clogging of the protective grid 4, and there is a signal at the output of the regulator 7 of the relay gas bypass. On these signals, at the output of the first circuit AND 33, a signal is generated, which is fed to the input of the second circuit OR 42, blocking the actuators 39, 40, 32 and closing valve 8.

Claims (1)

SYSTEM OF ANTWISE PROTECTION OF THE COMPRESSOR INSTALLATION by ed. St. No. 1086229, characterized in that, in order to increase the reliability of the compressor installation, it additionally contains a sensor and a gas temperature setpoint at the compressor outlet and a comparator connected by the output to the logic unit, and the inputs to the temperature sensor and setter. C <e SU ... 1222899>