Thermo-economic Analysis of a Large-scale Coal-Fired Power Plant Incorprating A New Type Feedwater Pump Driven by Turbines’ Shaft

Turbine coaxial feedwater pump driven by turbines' shaft is a new type of feedwater pump in coal-fired power plant, which does not need to consume additional plant power or set up independent condensing equipment. This study takes a 660 MW large air-cooled power plant, which adopts coaxial drive feed pump for the first time in China, as an example, and comprehensively compares the thermo-economic performance of steam bleed driven feed pump, electric-driven feed pump and coaxial drive under different power loads. The results show that: the coaxial drive mode with speed control star has the best thermal performance under full operating conditions, and the average annual revenue increases by about 10 million yuan compared with the electric feedwater pump drive mode, and the dynamic payback period is 2.48 years.