The working parameters of ultra-supercritical double-reheat boilers are high

making the working environment of water wall more harsh

which puts forward higher requirements for hydrodynamic power of the boiler. In this paper

the ultra-supercritical 1 000 MW double-reheat tower type boiler in Huaneng Laiwu Power Generation Co.

Ltd. is taken as an example for the detailed thermal hydrodynamic research. Based on data from both field measurement and theoretical calculation

thermal hydrodynamic characteristics and wall temperature distributions are analyzed

under BMCR

75%BMCR

50%BMCR

35%BMCR condition. The results show that

the deviations of both mass flow rate and wall temperature decrease by using the spiral tube water wall in the lower furnace. Although there is somewhat deviation of mass flow rate in the vertical upward water wall

the wall temperature distribution is still in a reasonable region

due to a large scale of convective heat transfer area in the higher furnace.