METHOD FOR AUTOMATICALLY CONTROLLING GAS DRYING PROCESS AT COMPLEX GAS TREATMENT PLANTS IN THE FAR NORTH OF THE RUSSIAN FEDERATION Russian patent published in 2023 - IPC B01D53/26 F17D3/01 

FIELD: natural gas industry.

SUBSTANCE: natural gas treatment for long-distance transport and can be used for automatic control of the gas drying process at complex gas treatment installations - CGTIs in the Far North of the Russian Federation. The automated process control system (APCS) measures the actual specific entrainment U_act of diethylene glycol (DEG) by dried gas at the outlet of the multifunctional absorber (MFA) and compares it to the specific entrainment setpoint U_set. The APCS monitors compliance with the condition of U_act≤U_set and, in case of its violation, the APCS system immediately generates a message to the CGTI operator and switches the MFA control mode to step down the flowrate of the dried gas in it using a PID controller that controls the control valve (CV) installed at the MFA outlet. When the APCS detects that the condition U_act≤U_set is met, it takes the last recorded value of the drying gas flow Q as the value of the new setpoint for the drying gas flowrate Q_set in the MFA and then controls the operation of the MFA in the main mode, taking into account the new setpoint.

EFFECT: automatic maintenance of the gas treatment mode for long-distance transport and the quality of the dried gas sent to the consumer.

2 cl, 2 dwg