Abstract
Integrated heat storage is an effective way to greatly improve the operation flexibility of coal-fired power plants. In this paper, a molten salt heat storage system extracting heat from the reheat steam of a coal-fired power plant is designed. The key limiting factors of heat storage system design are analyzed. Thermodynamic analysis model is established. The operation flexibility and energy quality loss of integrated system under different heat storage/heat release rates are studied. The results show that when the boiler maintains stable combustion, the integration of heat storage system reduces the minimum electric load of the coal-fired power plant from 30% of the rated load to 17.64%, and the round-trip efficiency of the heat storage system is 64.98%. The integration of heat storage in the coal-fired power plant produces additional exergy loss, which decreases with the decrease of heat storage rate. The molten salt heat exchanger and condenser have the largest proportion of additional exergy loss in the heat storage process and the heat release process, respectively.
| Translated title of the contribution | Operation Flexibility and Thermal Performance Analysis of Integrated Molten Salt Heat Storage System Extracting Heat From the Reheat Steam for Coal-fired Power Plants |
|---|---|
| Original language | Chinese (Traditional) |
| Pages (from-to) | 2331-2339 |
| Number of pages | 9 |
| Journal | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics |
| Volume | 44 |
| Issue number | 9 |
| State | Published - Sep 2023 |