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Uniform temperature and flow fields for the energy-storage-heat-exchanger: The role of a novel cyclone mixer

Journal of Energy Storage, ISSN: 2352-152X, Vol: 107, Page: 115022
2025
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Article Description

Here, an energy storage system into coal-fired power plant is integrated to increase its flexibility to balance the unstable renewable energies, in which two streams of flue gas with large temperature difference of ~300 K are extracted from the furnace to heat the molten salt in a heat exchanger. A mixer is necessary to provide uniform flow field and temperature field at the inlet cross-section of the heat exchanger. The cyclone mixer is proposed, with the novelty including the coaxial entrance of the two streams of flue gas to decrease thermal stress of the mixer, and the nonuniform rectified grille at the mixer outlet to decay the tangent and radial velocity components for the gas leaving the mixer. Numerical simulation is performed to verify the effectiveness of the mixer. The results show that the maximum temperature difference becomes <5 K over the outlet cross-section of the mixer, giving the entrance temperature difference of 300 K. Steep temperature gradient is observed while using the conventional Y-type entrance, but such gradient is significantly flattened while using the coaxial entrance instead. Besides, the rectified grille reduces the radial and the tangential velocities by 98.7% and 97.2%, respectively, minimizing the disturbance of the flow field on the heat exchanger. The physical mechanism is discussed to achieve the surprising outcomes. In summary, the proposed cyclone mixer provides uniform temperature field and flow field boundary condition for the heat-storage-heat-exchanger.

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