To improve steam parameters for better power generation efficiency and economy and meet the development needs of nuclear power plants

a duct-type steam generator is proposed

which is suitable for high-temperature gas-cooled reactors with ultra-supercritical parameters. The main features of the duct-type steam generator's structure are introduced

and the advantages of this structure in terms of heat transfer performance

operation safety

and production cost are analyzed. Through the establishment of a theoretical calculation model

thermal engineering analysis and heat transfer performance study of axial

radial

and quasi-three-dimensional temperature distributions and other parameters of the steam generator with direct countercurrent heat transfer mode are carried out. The calculation results show that

the duct-type steam generator is mainly based on convection heat transfer mode

with obvious temperature distribution segments and excellent heat transfer performance

which meets the relevant heat transfer requirements. This study can provide a reference for design and development of steam generators in nuclear power plants.