Design of High Efficiency Supersonic Nozzle Based on Requirement of Peak Regulation
In order to achieve carbon neutrality,renewable energy power grows rapidly.While its stochastic volatility requires controllable power source,mainly as thermal power units(TPU),to deeply participate in peak regulation to balance the mismatch between power supply and demand.However,in the regulating stage of conventional TPU,the tapering nozzles is difficult to efficiently utilize the enthalpy corresponding to the pressure change below the critical pressure ratio,which is main reason for the efficiency decreases to use sliding-pressure operation mode at low load conditions.In this paper,a high-efficiency supersonic nozzle is designed for deep peaking(20％～40％low load range)of a 320 MW turbine,and the thermal performance of the supersonic nozzle in the low load range is analyzed by CFD simulation.The results show that compared with the conventional nozzle,the designed supersonic nozzles have efficiency improvements of 1.08％～8.40％at 20％～40％rated load.Besides,due to the oblique cutting structure of supersonic nozzle,the optimal operating pressure of supersonic nozzle with a design back pressure of 5 MPa deviates from the design pressure by about 0.7 MPa.The research of this paper can provide theoretical support for the research and development of deep peak shaving and deep energy saving technology for TPU.
deep peak shavingthermal power unitgoverning stagesupersonic nozzlenumerical simulation
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