METHOD OF AUTOMATIC CONTROL OF GAS CONDENSATE SUPPLY PROCESS INTO MAIN CONDENSATE LINE Russian patent published in 2020 - IPC F04D15/00 F04D13/14 

FIELD: gas industry.

SUBSTANCE: invention relates to production and preparation of gas condensate for long-distance transport. Method of automatic control of the process of supply of gas condensate to the main condensate line (MCL) includes an automated process control system (APCS) controlling operation of parallel operating units. Each of the units is connected to the suction pipeline, and their pressure pipelines enter the collector MCL. MCL is equipped with a condensate flow rate transducer behind the header. Electric motor (EM) of each unit is connected to individual frequency converter and is equipped with current sensor in its power supply line. Change in EM rotation speed is generated by an individual proportional-integral-differentiating PID-controller. APCS, having received the task of performance of integrated gas treatment unit, divides all ready-to-operate pump units into three groups. First group includes one pump unit – the main one. Second group includes units which, together with the main unit, will make a plan for feeding condensate into the MCL. This group APCS defines as operating. Third group APCS assigns to the group of backup and will use them if necessary. APCS division into groups is performed by means of two switching units connected to PID-controller of each unit. First switching unit commutes one of two types of setting signal and supplies the required setting signal to the input of its PID controller SP depending on the group where the unit is switched on. Second switching unit commutes one of two types of feedback signal and sends the selected signal to the PV feedback input of its PID-controller depending on the group, into which the unit is connected. Upon the command to start the system, the APCS includes the main unit by sending the signal of the plan for pumping of condensate to the MCL, which is set by the dispatcher of the gas producer, with the help of the first switching unit to the SP input of its PID-controller. Simultaneously, using the second switching unit, APCS sends signal of gas condensate flow rate sensor to MCL to input feedback of PV of PID controller of the main unit. After the main pump unit goes into operating mode, APCS sequentially starts pump units from the group of operating units. For this purpose, using the first switching unit, it sends to the input of SP setting of their PID-controllers a signal equal to the value of average current in power lines of the main unit and connected in parallel to it pump units from the group of working together with the unit connected to them. At that, value of average current of APCS is calculated by formula taking into account current value in power supply line EM of main unit, value of current in power supply line of EM i-th connected and connected unit from working group. And to the PV feedback input of these PID-controllers APCS, using their second switching units, sends a signal from current sensors installed in power supply line of EM units controlled by them. At that, APCS monitors all measured parameters and recalculates values of calculated parameters with given periodicity, which guarantees continuous control of technological process.

EFFECT: invention is aimed at maintaining specified flow rate of pumped gas condensate in MCL with high reliability and minimum power consumption by automatic uniform load distribution between units.

5 cl, 1 dwg