Objective To enhance the deep peak shaving capacity of coal-fired units, this paper proposes a deep peak shaving system for coal-fired units coupled with non-supplementary compressed air energy storage.
Method During periods of low grid load, the system stores electrical energy via air compression to reduce external power supply; during peak grid load periods, it releases the energy stored in compressed air to increase external power supply.
Result Taking a 2×350 MW supercritical coal-fired unit with primary intermediate reheat as an example, the calculated internal rate of return (IRR) on project capital is 7.45%, demonstrating that the system has a certain degree of economic viability.
Conclusion At present, while coal-fired units coupled with non-supplementary compressed air energy storage may have some disadvantages in initial investment, this scheme can significantly enhance the bidirectional peak shaving capacity of coal-fired units. Furthermore, it requires no modification to the units' existing equipment, thus preventing adverse impacts on their operation and offering certain application prospects in the field of deep peak shaving for coal-fired units.
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