针对新能源电力波动性导致的弃电问题,本文以甘肃某工程项目为例,研究利用熔盐储热系统将弃电转化为热能,为化工装置供热的技术经济方案。基于全年弃电数据,分析不同电加热器功率与储热容量组合对弃电利用率及投资回收期的影响。研究结果表明,系统可有效回收50%～60%的弃电,其中电加热器功率200 MW、储热容量1 500 MW·h为最优方案,投资回收期最短(8.69年)。研究指出,系统初始投资是影响经济性的关键因素,运行中需关注熔盐传热、腐蚀及系统切换等问题。
关键词: 熔盐储热 / 弃电利用 / 投资回收期
Abstract:
Based on the volatility of renewable energy leading to power curtailment issues, this paper takes a practical project in Gansu as a case study to investigate a techno-economic scheme that uses a molten salt thermal energy storage system to convert curtailed power into thermal energy for supplying heat to chemical plants. Based on annual power curtailment data, the impact of different combinations of electric heater power and thermal storage capacity on the curtailment utilization rate and investment payback period is analyzed. The results indicate that the system can effectively recover 50%～60% of the curtailed power, with an electric heater power of 200 MW and a thermal storage capacity of 1500 MWh identified as the optimal solution, yielding the shortest payback period (8.69 years). The study highlights that the initial system investment is a key factor affecting economic viability, and operational attention must be paid to issues such as molten salt heat transfer, corrosion, and system switching.
Keywords: molten salt thermal energy storage / utilization of curtailed electricity / investment payback period