Systemic efficiency of re-equipment of gas transport objects with the environmental protection factor

The analysis of operation of gas-pumping units (GPUs) with various types of supercharger drives (gas turbine and electric drives) is presented. The assessment of overall system effect due to the conversion of a number of compressor stations (CSs) to combined supercharger drive is provided taking into account the concomitant environmental effect. For the successful development of the infrastructure of settlements of roadside consumers, the size of operations areas and environmentally-acceptable (in terms of emissions and noise) distances to the boundaries of the protection zone of CS of the main gas pipeline (MGP) are important. The method of determining the distance from the CS at which the air quality standard is observed is formalized and calculations of boundary distances for CS of MGP are carried out. The functional diagram for calculation of ecological factors during the modernization of CSs at the conversion to combined supercharger drive is made. The calculated characteristics of dispersion options for emissions from the CS with gas turbine drive are presented. Graphical dependences of the value Cx / Cm on the distance to the point of maximum emission concentration in the surface air layer are obtained. The conversion of a number of CSs to combined drive is able to provide the following benefits: during the off-peak periods the electric power supply of the electric drive of GPU of the CS of MGP is carried out by additional load of nuclear power units; load of the electric drive at night is better because of the greater temperature difference between the exhaust gases of the gas turbine and the outside air, and at the same time, either smaller number of gases are evacuated through the mouth of the exhaust pipes (fragmentary conversion to the electric drive), or there is no flue gas emission at all (complete conversion to the electric drive); the project sanitary withdrawal of residential and agricultural land in the area of CS of MGP under the conditions of excess air pollution is reduced. At the high price of land near the right-of-way of CS of MGP this can result in additional tangible effect: more "close" abutting to the industrial site of the CS with combined drive (permitted by air quality standards), which causes less capital-intensive logistics solutions along the heating main. (paper)