AUTOMATIC CONTROL SYSTEM OF APPARATUS FOR AIR COOLING OF NATURAL GAS Russian patent published in 2019 - IPC F04D27/00 F28F27/00 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to air cooling devices of natural gas and can be used, in particular, for gas cooling after compression at compressor stations of main gas pipelines. System comprises temperature setting unit, first made in form of integral controller, frequency-controlled electric drive, which includes frequency converter and asynchronous squirrel-cage motors of fans, fans, heat exchanger and temperature sensor, wherein output of frequency converter is connected to asynchronous electric motors, kinematically connected to fans, acting air flow to heat exchanger, is equipped with proportional-differential controller, proportional regulator and second-order aperiodic regulator, wherein input of proportional-differential controller is connected to temperature sensor output, its output is connected to second input of first controller and second input of proportional controller, output of the temperature setting unit is connected to the first input of the first regulator, the output of the first regulator is connected to the first input of the frequency-controlled electric drive and through the aperiodic controller of the second order with the first input of the proportional regulator, the output of which is connected to the second input of the frequency-controlled electric drive. Time constant of the first regulator is selected from the relationship T_R1=0.6k_ok_Ek_DT_o, where k_E, k_D are transmission factors of electric drive and temperature sensor, k_o, T_o – transfer coefficient and time constant of heat exchange process in heat exchanger, time constant of differentiating conversion of proportional-differential controller is selected equal to time constant of heat exchanger, transfer coefficient of proportional regulator is selected equal to k_R3=5.

EFFECT: reduced number of adjustable parameters, as well as improved dynamic characteristics of the system in conditions of variations of its parameters due to changes in external conditions and, consequently, no need to adjust regulator coefficients after primary adjustment.

1 cl, 4 dwg