供热机组配置熔盐储热系统构型设计及性能分析

To address issues such as difficult heat-power decoupling and limited peak-shaving capacity in coal-fired cogeneration units, a steady-state model of the cogeneration unit was developed, and a molten salt heat storage system was integrated to assist in heat supply. The impact of the heat storage steam supply ratio γ on peak-shaving capability and thermodynamic performance was studied. A comprehensive evaluation was conducted based on the TOPSIS method, and the optimal heating mode was determined. Results show that the γ has a positive promoting effect on the system's peak shaving capacity and energy efficiency. The optimal mode is when molten salt steam supply undertakes the entire heating load. Under this condition, the unit power output decreases from 248.15 MW to 176.34 MW during the heat storage process, achieving a deep peak shaving capacity of 15.66 MW. During the heat discharge process, the output power increases to 345.40 MW, realizing a peak over-generation capacity of 25.40 MW, which bidirectionally expands the power regulation range. This mode features both high efficiency and low carbon properties. Under the heat storage and heat discharge modes, the energy efficiency reaches 48.89% and 60.94% respectively, the exergy efficiency is 35.13% and 37.86% respectively, the round-trip coal consumption rate for power supply is 290.15 g/(kW·h), and the carbon emission amount is 677.14 g/(kW·h).