Abstract:
Introduction In order to improve the deep peak shaving ability of coal-fired units, a deep peak shaving system for coal-fired units coupling non-afterburning compressed air energy storage is proposed in this paper.
Method The system stored electric energy by compressing air during the low load period of the power grid to reduce the external power supply, and released the electric energy, stored by compressing air, during the peak load period of the power grid to increase the power supply.
Result Taking a 2×350 MW supercritical primary intermediate reheat coal-fired unit as an example, the calculated internal rate of return on project capital is 7.45%, indicating that the system has a certain level of economic viability.
Conclusion At this stage, coal-fired units coupling non-afterburning compressed air energy storage may have some disadvantages in terms of initial investment, and this scheme can significantly improve the bi-directional peak shaving ability of coal-fired units. Moreover, it does not require modifications to the existing equipment of the units, thus avoiding adverse effects on their operation. It has a certain application prospect in the field of deep peak shaving of coal-fired units.
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