Выбор параметров и конструкции приводной ГТУ с воздушной турбинной теплоутилизирующей установкой в составе ГПА мощностью 16 МВт

Abstract

The introduction of combined turbine units is a promising method to increase fuel efficiency (pumped natural gas) and improve the environmental performance of the gas turbine units (GTU) that are used to drive superchargers of gas pumping units (GPU). Such an installation consists of the main GTU operating on natural gas and an additional air turbine unit (ATU). The latter utilizes the heat of the combustion products leaving the gas turbine unit in a heat exchanger, behind which cooled air is mixed with flue gases. The efficiency of heat recovery is determined by solving a complex technical and economic problem of selecting the optimal weight-and-size parameters of the heat exchanger. When retrofitting a gas pumping unit, it is advisable to use a GTU that is slightly different in design and parameters as the basic gas turbine unit. The ATU does not have an operating equivalent. Its parameters should ensure achieving the maximum fuel efficiency factor of the combined installation, with acceptable weight-and-size parameters of the ATU and the heat exchanger. As an example of developing the GTU-ATU type installations, an option of modernizing a GTU for a 16 MW GPU is proposed, which constitutes the basis of the Gazprom fleet. A combined GTU-ATU is designed to include the main 16 MW GTU and an additional 1 MW ATU to drive the electric generator. The fuel efficiency factor of the GTU-ATU installation reaches 39.3%. The design of the developed ATU is simple and reliable. Plate-ribbed surfaces PlR-2/PlR-2 are used to achieve the optimum mass-and-weight and hydraulic parameters of the heat exchange. A layout of the units of the combined installation is proposed, in which acceptable hydraulic resistance in the pipelines is provided. The feasibility study shows that the project is economically feasible. The environmental effect of modernization using an ATU is characterized by a significant decrease in the temperature of flue gases and concentration of harmful emissions by 1.3 times.