Abstract
Sodium heated once through steam generator (SG) is an important part of sodium cooled fast reactor. It converts the heat of hot sodium into water and water into superheated steam. Steam can turn a turbine to generate electricity. Compared with modular steam generator, large steam generator has great advantages in the application of large commercial sodium cooled fast reactor. Large steam generator can reduce its manufacturing cost and improve the economy of sodium cooled fast reactor. At the same time, the design of double-wall tube structure reduces the probability of sodium-water reaction and improves the safety and reliability of steam generator. In this paper, the heat transfer regions of the fluid in the heat transfer tube were reasonably divided, the heat transfer relations suitable for the double-wall tube steam generator were compared and analyzed, the contact thermal resistance of the double-wall tube was studied, and a set of physical models suitable for One-dimensional Steady-state calculation of large double-wall straight tube steam generator were established. In order to test the established physical model, the calculation results of the program were compared with the design data of some double-wall straight tube steam generators. It was found that the two agree well, which verified the correctness of the program. The 1-D steady-state thermal analysis of double-wall straight tube steam generator (DWTSG) was carried out by using the calculated results of the code.
