Optimization configuration of coal mine multi-energy complementary heat and power coordinated supply system in western China

With the advancement of the “dual-carbon”goal, utilizing renewable energy resources to reduce carbon emissions in the coal mining process has become a significant development trend.However, the construction of mine multi-energy complementary systems faces multiple challenges, including complex resource endowment conditions, diverse energy utilization technologies, and variable energy demand loads. To achieve customized development under different supply demand boundaries for coal mines, this study focuses on the Nalinhe No. 2 coal mine in the western region, with an annual production of 8 Mt. It proposes a coal mine multi-energy complementary combined heat and power supply system, integrating renewable energy and associated coal mine resources, along with an optimization method for configuration. This system utilizes photovoltaic, wind power, heat pumps, and energy storage devices to achieve energy production, conversion, and shifting within feasible boundary conditions, enabling complementary and synergistic use of electrical and thermal energy, and energy sharing. By analyzing the energy demands for heat and power in the mine and the characteristics of solar, wind, and associated resources in the mining area, and considering constraints such as meteorological conditions, time-of-use electricity prices, and equipment capacity, the system meets real-time heat and power demands with the lowest total energy supply cost. Based on load data, equipment models, and optimization algorithms, a multi-energy complementary combined heat and power supply model was constructed. A multi-dimensional evaluation index system based on economic efficiency, energy efficiency, environmental protection, and safety reliability was proposed to analyze and evaluate the system. The research results show that the multi-energy complementary combined heat and power supply system can achieve clean and low-carbon combined heat and power supply for the mine, significantly reducing dependence on fossil fuels. Taking the Nalinhe No. 2 coal mine as an example, the use of a multi-energy complementary combined heat and power supply system can significantly reduce energy procurement costs, with total system operating costs reduced by more than 50%, the proportion of green energy in the system can be increased to over 65%, achieving over 80% self-use of renewable energy generation, and annual carbon dioxide emissions can be reduced by over 45%.