Zero-output Grid-connection Experiment of Multiple Decoupling Technology Fusion Unit Based on Large-scale Heating Condition of 350WM Supercritical Units

Winter in northern China presents a prolonged heating period, with the year-end severe cold and extremely cold period inducing significant heating pressure. Notably, the heating units around the city are facing the dual pressures of “improving people's livelihood” heating and enhancing flexibility to absorb a large proportion of renewable energy. Recently, Inner Mongolia Jingneng Shengle Thermal Power Co., Ltd. (hereinafter referred to as “Shengle Thermal Power”), as one of the four major heat sources within the urban area of Hohhot, has successively implemented a host of thermoelectric decoupling technical transformations, encompassing high back pressure heating, bypass steam extraction, and electric boiler heat storage. In this context, based on a series of decoupling technologies of Shengle Thermal Power, this research successfully conducts the single unit zero-output grid-connection experiment with the fusion of multiple thermoelectric decoupling technologies. Without reducing the heating capacity of the whole plant, the experiment of this research achieves the goal of flexibility peak shaving of 33 % rated load of the entire plant, as well as the synchronous improvement of energy saving, heating, and flexibility of coal-fired thermal power units throughout the year. Simply put, this researchproposes a novel solution to alleviate the electrothermal contradiction of thermal power heating units in northern China. While vigorously promoting the scientific and orderly implementation of the three transformation linkage policy in China, the solution proposed in this researchis capable offurnishing valuable inspiration for the flexibility transformation goal setting and performance acceptance as well as policy formulation and optimization of thermoelectric units in the heating period within the northern China.