Известия Томского политехнического университета: Инжиниринг георесурсов (May 2019)
Analysis of the efficiency of a triple combined cycle gas turbine
Abstract
The paper considers the structure of fuel consumption in Russia and technical level of equipment at power plants at the present stage. It was ascertained that the new equipment when working on gas will be installed on the basis of combined-cycle plants, the efficiency of which abroad has already exceeded 60 %. It is shown that one can use binary cycle steam turbine parts with a low-boiling substance in the lower loop for combined-cycle plants efficiency. For low-boiling substance condensation it is advantageous to use air capacitors. The paper introduces the diagram of tinaroo type combined-cycle plant with binary cycle in steam turbine and describs the principle of its work. The authors have determined energy balances of all elements of tinaroo type combined-cycle plant and studied the efficiency of combined-cycle plants operating on the basis of three cycles: gas-turbine cycle of Brighton and two steam-turbine Rankine cycles: one of which works on water and steam, and the other operates on low boiling substance. The analytical equation of triple combined-cycle plant efficiency dependence on efficiency of cycle gas turbine unit, the efficiency of steam turbine cycles turbines operating in water and water steam and low boiling substance, and the efficiency of a boiler-utilizer. The paper demonstrates the effect of each cycle and of boiler-utilizer on the efficiency of triple combined-cycle plants. Using the regression analysis the authors identified the efficiency coefficients of separate cycles and the efficiency of boiler-utilizer at the efficiency of triple combined-cycle plants. The authors analyzed the ways of increasing the efficiency of each cycle of triple combined-cycle plant and the efficiency of boiler-utilizer.
