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the required mass flow rate. The difficulty is that for the reference design with the 20 MPa compressor outlet pressure at about 33% of rated power the flow through the recompressing compressor is zero, therefore a very wide range of operating characteristics is required for the recompressing compressor. 11.3 Summary A preliminary assessment of power control schemes was performed. First typical control schemes used for closed cycle gas turbine were surveyed and their performance was described. The developed supercritical CO2 turbomachinery off-design performance maps were then used to assess the behavior of the traditional control schemes when applied to the supercritical CO2 recompression cycle. The focus was on bypass and inventory control. Bypass control performs well and can be utilized for power control of the supercritical CO2 cycle if a throttling valve is introduced on the inlet of the hot side of the high temperature recuperator. This keeps the flow split between the compressors almost constant, thus they operate close to their design points. The location of the bypass is before the fluid enters the reactor and is merged back on the turbine outlet. Use of inventory control is significantly more complex. The reason is that due to real gas behavior when the pressure is dropped the flow split changes. Thus, the compressors operate away from their design points. At about 30% of rated power the recompressing compressor flow is zero. This requires both compressors to have a very wide range of operating characteristics, which is difficult to achieve if the main compressor is located on the same shaft with the turbine and the recompressing compressor and the shaft is synchronized with the grid. Either a multiple shaft layout is required or adjustable blading of the compressors is necessary. Nevertheless, bypass control is sufficient to fulfill the requirements imposed on the control scheme of a base load power plant and power control of the supercritical CO2 recompression cycle is possible. In the future the option of varying reactor inlet and outlet temperatures should be investigated as an alternative method of control. The future work should primarily focus on the development of more advanced control schemes. 253PDF Image | Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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