Radial Turbine Design For Power Plant Supercritical CO2 Process

As Fossil fuel plants continue to be the most common means of generating electric power; some challenges that must be considered with design of a power plant include energy efficiency, noise reduction, reduced “land footprint” as well as lowering emissions.

Companies and research organizations are now exploring different types of power cycles including the SCO2 “Allam” cycle which promises compact sizes, integrated carbon capture, and high efficiencies. However, the Allam cycle is still in a premature phase due to technological barriers that currently hinder its full-scale development. These challenges include the employment of a predominantly Supercritical CO2 working fluid for which no established turbine design practice exists. What is known, however is that a radial turbine typically has a simpler construction and fewer stages compared to an axial turbine, making it a good candidate for such high fluid density.

SoftInWay was an early adopter of supercritical carbon dioxide (SCO2) as a working fluid; and as a result, is in a unique position where its software capabilities are well equipped to account for the temperature, power density, and pressure requirements of a SCO2 turbine. AxSTREAM is the only software solution that can be used for the full design of turbomachinery including: axial, centrifugal, and mixed-flow turbines, compressors, pumps, and fans. Currently more than 450 companies worldwide use AxSTREAM® for their turbomachinery projects. AxSTREAM is also trusted by universities across the globe to help students learn and develop their skills in mechanical engineering with a special emphasis on turbomachinery design, analysis, and optimization.

In this webinar led by Tala El Samad, a PhD candidate at Cranfield University, a thermodynamic analysis of a mid-range cycle (100 MW) with a lower turbine inlet temperature (900°C) is examined. Thermodynamic parameters from the cycle, with a net electric efficiency of 49.1%, will be used for the design of a multi-MW-scale turbine by employing both meanline turbomachinery modelling tools and higher fidelity, 3D CFD techniques. Parametric studies will be performed in the initial, preliminary and meanline aerodynamic design phases to investigate the effect of key factors such as rotational speed, flow angles, and sizing on the turbine’s performance. SoftInWay’s AxSTREAM software platform will be used throughout the design steps.

Topics covered include:

• Generating different turbine designs through inverse task calculations.
• Performance analysis of selected turbine designs and off-design calculations
• CFD analysis of the flowpath and performance parameter calculations.
• Assessment of stresses on turbines.

Source: Tala El Samad, PhD candidate at Cranfield University

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