Supercritical Carbon Dioxide Turbine Design and Arrangement Optimization

Abstract

To achieve a supercritical CO2 cycle power generation system, a 25 MW supercritical CO2 turbine rotor and cylinder were designed. Then, two compact arrangement schemes were proposed in this paper for the optimization of a supercritical CO2 turbine rotor. In Scheme 1, the balance piston was arranged in the cooling gas section, which was more conducive to the arrangement of the dry gas seal. In Scheme II, the oil bearing was replaced by the gas bearing, and the dry gas seals at both ends of the turbine were installed outside the gas bearing, which was combined with the cooling gas section. The results suggest that the length of the rotor is reduced by 9% and 17% based on the above two schemes. The compact arrangement of the supercritical CO2 turbine can well reduce the shaft length of the turbine, which is beneficial to the structural design and operation of the supercritical CO2 turbine.

Supercritical CO2 Power Technology: Strengths but Challenges

“…This is a major task to conduct in order to be able to cope with and exceed the performance of steam cycles not only in "ideal" conditions but also in real ones. This requires long and costly aerodynamic, thermal and mechanical studies [61,62].…”

Research on Discharge Characteristics in Ultra-high Pressure Gases (Supercritical Fluids): A Brief Review

“…Supercritical CO 2 has found applications in in chemical (food) processing technology, e.g. fluid extraction [21] where it is used as a highly efficient solvent, or in supercritical fluid based turbines [22] where the combination of high density and low viscosity of supercritical fluids have been used to realize more compact turbines with higher efficiencies.…”