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

FIELD: natural gas industry.

SUBSTANCE: natural gas treatment for long-distance transport, in particular to automatic control of gas drying in multifunctional absorbers (MFA) of complex gas treatment plants (CGTPs). A method for automatically controlling the gas drying process at the MFA of a CGTP includes monitoring and controlling the main parameters of the process using an automated process control system (APCS), which calculates the flowrate G_p of regenerated absorbent, for example DEG, and corrects its value by introducing a correction Δ. The value and the sign of correction Δ is determined by APCS based on comparison of the dew point temperature setpoint of the dried gas T_d.p.s. with its actually measured value T_d.p.a. in real time using a regenerated DEG (RDEG) mass flow correction unit. From the output of the correction block, the corrected signal for setting RDEG supply is transmitted to the SP input of the RDEG flowrate PID regulator. At the same time, the APCS, at the given time increments, measures the concentration value ρ_i of saturated DEG at the outlet of each MFA. The measured values ρ_i for all the MFAs are recorded by the APCS in its database, and the system monitors the dynamics of changes in these values. Having switched from the normal mode of controlling the flow of dried gas through the MFA to the new dried gas flowrate setpoint search mode, the APCS searches for the value at which the concentration of NDEG ρ_i will return to its last assigned mean value. This switching of the operating mode of the MFA is carried out by the APCS using its dry gas flowrate setpoint correction unit. The dry gas flowrate setpoint correction unit in normal mode transmits a control signal to the control valve (CV), which controls the dry gas flow through the MFA, ensuring that production complies with the planned target. If problems are detected in operation of the absorption section of the MFA, the APCS generates a command to search for a new setpoint for the dry gas flowrate for this MFA. At the end of this search, the automated process control system generates messages to the operator about the value of the new setting and the new parameters of normal operation of this MFA. The APCS generates a message to the CGTP operator about the need to change the CGTP operating mode.

EFFECT: invention ensures automatic maintenance of the gas treatment conditions for long-distance transport at gas treatment plants located in the Northern regions of the Russian Federation in compliance with the technological standards and restrictions provided for by its technological regulations, in various modes of its operation.

2 cl, 4 dwg