As an important part of the gas-fired power plant

air intake system frequently requires to replace its filtration units

resulting in high operation and maintenance cost because of the small design capacity. Based on the power plant operational data

the life cycle cost(LCC) analysis method is used to comprehensively analyze the cost of the air intake system during the life cycle

and an LCC model of air intake system is built. By optimizing the capacity coefficient k of the intake system

the net present value of the intake system reaches the lowest value. The calculation results for an F-class combined-cycle power plant show that

with design life of 30 years

annual operating hours of 4 500 hours

and the initial investment of the air intake system increased by 5.76 million yuan

the annual operation and maintenance cost of 988 300 yuan can be saved

which has good economic benefits. Meanwhile

this model optimization method has important reference value for the design and selection of air intake system of new power plants in similar areas.