METHOD FOR AUTOMATICALLY CONTROLLING GAS DRYING PROCESS AT COMPLEX GAS TREATMENT PLANTS LOCATED IN THE FAR NORTH OF THE RUSSIAN FEDERATION Russian patent published in 2023 - IPC B01D53/00 B01D53/26 B01D53/14 

FIELD: gas industry.

SUBSTANCE: preparing natural gas for long-distance transport. Invention relates in particular, to the automatic control of gas drying at complex gas treatment plants (CGTPs) located in the Far North of the Russian Federation. A method is described for automatically controlling the gas drying process at complex gas treatment plants - CGTPs, located in the Far North of the Russian Federation, including control and management of the main parameters of the technological process of glycol drying of produced gas using an automated process control system - APCS, which monitors the dynamics of the behavior of the actual consumption of regenerated absorbent and the consumption of regenerated absorbent calculated using the technological process model, and also monitors the implementation of the planned target for the volume of supply of dried gas Q into the main gas pipeline, ensuring that Q corresponds to the set point for the flow rate of the dried gas, while the APCS in real time with a given discreteness measures the actual consumption of the regenerated absorbent and as soon as its value reaches the maximum possible value, and the temperature value of the actual dew point of the dried gas at the outlet of the multifunctional absorber - MFA also goes beyond the permissible deviations in accordance with the setting provided for by the technological regulations of the gas treatment plant, then the process control system starts unloading the MFA, reducing the flow rate of dried gas through it, for which it sends a command to the block for correcting the mass flow rate of dried gas in the MFA to block the control signal from the output of the PID controller to maintain the specified flow rate of the dried gas in the MFA, and transfers control of the flow of dried gas through the MFA to the PID - a regulator for searching for the required flow rate of dried gas through the MFA, after which this PID controller begins to search for the required flow rate of dried gas through the MFA, sufficient to counter the current situation, and at the same time, the automated process control system generates a message to the operator about switching to the mode for adjusting the flow rate of dried gas through the MFA, and as soon as the APCS finds the dry gas flow rate at which the difference between the values becomes zero or falls within the specified boundaries that are set by the maintenance personnel, i.e. is not higher than a given permissible deviation, then the APCS records this value of the dry gas flow rate as a new setpoint in its database and submits it to the input of the SP task of the PID controller for maintaining the specified flow rate of the dried gas in the MFA, and at the same time the APCS transfers the correction block to broadcast the control signal from the output of the PID regulator for maintaining a given flow rate of dried gas to the control valve of the flow rate of dried gas and then the PID regulator for maintaining a given flow rate of dried gas in the MFA will control the flow of dried gas through it, using the new set value, generating a message to the operator about the new operating parameters of the installation.

EFFECT: maintaining the specified quality of the dried gas in the event of deviations during the technological process at the gas treatment plant, eliminating the human factor when making management decisions and increasing efficiency in finding the causes of emergency situations.

3 cl, 2 dwg