Hrudz V. Rational modes of operation of long-operated gas transportation systems under condition of their incomplete loading

The dissertation is devoted to the establishment of regularities of technological processes in gas transportation systems for optimization of operational control of operational modes with the condition of their incomplete loading. On the basis of the study of the stationary modes of operation of the gas transmission system when changing the volumes of gas pumping, the principle of constructing mathematical models with the use of integral coefficients for the operational control of its operation in conditions of incomplete loading, which is characterized by sufficient accuracy and high speed of implementation of predictive parameters, is proposed. complex pipelines. A mathematical model of the gas pipeline was constructed taking into account the effect of compressor stations based on the classical equations of gas flow energy and continuity using the Dirac source functions. The implementation of the created mathematical model made it possible to obtain in the analytical form a dependence that reflects the law of oscillation in time of mass flow and pressure. The dependences of the trend of gas transmission system performance at its beginning and at the end showed the influence of placement of the compressor station in the gas transmission system, in particular its sequence number on the number route, on the nature of the non-stationary process caused by its stop, in particular on the duration of non-stationarity. The hydraulic state of the gas pipeline is characterized by the actual value of the coefficient of hydraulic resistance, which in the conditions of frequent changes in gas flow changes its value and error in its determination. flows as a function of linear coordinate. The principle of construction of mathematical models for forecasting modes of operation of gas-pumping units at compressor stations of main gas pipelines and their optimization in the conditions of incomplete loading of gas transmission system is proposed. To predict the modes of operation of multi-shop compressor stations, the optimal load distribution between shops equipped with different types of gas-pumping units is carried out under the condition of minimizing energy consumption for compressing a given volume of gas under known boundary conditions. The principle of optimality criterion construction for conditions of incomplete loading of gas transmission system is shown.