Power generation technology of supercritical carbon dioxide(S-CO_2) Brayton cycle is considered as a new generation technology that can replace steam Rankine cycle power generation. In this study

the concept design of 660 MW S-CO_2 coal-fired boiler was carried out by thermal calculation method

and the S-CO_2 parameters

area and flue gas temperature of each heating surfaces were determined to ensure that the boiler can adapt to the whole S-CO_2 cycle system. At the same time

the cost data of S-CO_2 boiler which is difficult to accurately evaluate were obtained based on the weighted mass method. Besides

the economy of the whole S-CO_2 unit was analyzed by means of levelized cost of energy(LCOE). The results show that

the LCOE of S-CO_2 coal-fired unit is 0.540 yuan/(kW·h)

11.3% lower than that of conventional unit

showing strong economic potential. The costs of boiler

recuperator and precooler in S-CO_2 unit are high. The main reason for the increase of boiler cost is the improvement of average material grade of medium/low temperature convection heating surfaces in S-CO_2 boiler. Therefore

the optimization of boiler(especially medium/low temperature convection heating surfaces)

recuperator and precooler is still needed to reduce the capital cost.