The current energy structure gives priority to fossil fuels, in every aspect of life in all walks of life and production will produce large amounts of carbon dioxide emissions, to human life and health security serious threats and challenges. Against the backdrop of the "peak carbon emissions and carbon neutrality" strategy, energy scarcity and environmental pollution have become major bottlenecks hindering economic and social sustainable development. The development of advanced clean energy systems is a significant requirement for implementing energy conservation and emission reduction strategies and establishing a clean, low-carbon, secure, and efficient energy system. Multi-energy integration and complementary systems offer an effective approach to address energy scarcity and reduce carbon emissions.

Multi-energy integration carbon reduction technology is one of the important ways to help different industries and different scenarios achieve carbon reduction. Through the form of multi-energy flow coupling, the mutual conversion process between different types and different qualities of energy, including electricity, heat, cold, hydrogen, etc. can be efficiently and flexibly adjusted, which can effectively improve the consumption rate of local renewable energy such as photovoltaic and wind power, and improve local energy utilization efficiency. Help the region achieve carbon reduction. As a critical physical carrier of the energy internet, these systems revolve around renewable energy generation as the core, integrating fossil energy resources with renewable energy, optimizing energy conversion processes, and enabling a combined supply of electricity, heat, and cooling at the end-user level. This integration ultimately facilitates the replacement of clean energy in various sectors such as transportation, the chemical industry, and metallurgy, thereby supporting global carbon neutrality efforts.

Currently, research on multi-energy integration and complementary carbon reduction technologies is in its early stages, and several key scientific issues need to be addressed. It is imperative to explore in-depth the methods of integrating and complementing new energy sources such as wind, solar, and hydro with traditional coal and natural gas fossil energy sources. We hope to further explore the mechanism and evolution path of multi-energy efficient integration, improve the efficiency of energy use, and improve the level of renewable energy consumption.

This topic includes but is not limited to the following aspects:
1) High energy consuming enterprises combine with desert and Gobi desert areas where new energy is abundant for on-site consumption;
2) The direction of transportation energy integration, such as port-ship-wind-photovoltaict-storage-hydrogen multi energy integration, vehicle-road-pile-wind-photovoltaic-storage-hydrogen multi energy integration;
3) The integrated self supply system of heat-electricity-gas-cold energy in industrial parks enhances the local consumption rate of green electricity;
4) Hydrogen bridge cranes and other hydrogen equipment use green hydrogen to replace traditional fuel to reduce carbon emissions;
5) Coupling new energy with industries such as coal chemical industry to reduce the use of coal;
6) Coupling new energy green electricity with the steel and non-ferrous metal industries to achieve carbon reduction in the smelting process;
7) Optimized management of building photovoltaict-storage-DC-flexible distribution energy to achieve carbon reduction.
8) Other carbon reduction directions.

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