Composite energy system and method integrating multi-energy storage and hydrocarbon fuel preparation

Abstract

The invention discloses a composite energy system and method integrating multi-energy storage and hydrocarbon fuel preparation. The composite energy system comprises a compressed air thermochemical energy storage hydrogen production system and an internal combustion engine-turbine energy release hydrogen production system. In the energy storage stage, through coupling of compressed air and heat absorption type chemical reaction, mixed storage of physical / chemical energy is achieved, and the energy grade of compression heat can also be improved; and in the energy release stage, gas fuel and air are combusted in an internal combustion engine to generate electricity, generated waste heat is recycled by stored high-pressure air and then enters a turbine to generate the electricity, and gradient utilization of energy is achieved. According to the composite energy system and method integrating multi-energy storage and hydrocarbon fuel preparation, in the energy storage stage and the energy release stage, hydrogen serves as a carrier to achieve conversion from low-grade heat energy to fuel high-grade chemical energy, and the energy utilization efficiency of the composite energy system is improved while an energy storage and hydrogen production integrated application mode is achieved.

Description

technical field [0001] The invention belongs to the technical field of energy storage and preparation of hydrocarbon fuels, and in particular relates to a composite energy system and method integrating multi-energy storage and preparation of hydrocarbon fuels. Background technique [0002] Due to the depletion of traditional fossil energy such as oil and coal, as well as the increasingly severe environmental pollution and ecological damage, countries around the world are focusing on the efficient use of traditional fossil energy and the sustainable development of clean new energy. Although a high proportion of new energy power supply has become the consensus of all countries in the world, the inherent volatility and uncertainty of new energy power generation will inevitably cause large frequency fluctuations in the power grid. The random fluctuation characteristics of the power load during the operation of the power system and the unpredictability of the grid connection of r...

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Problems solved by technology

However, the existing compressed air energy storage technology has a technical bottleneck of large loss of available energy in terms of storage and utilization of compression heat, which reduces the energy efficiency and energy storage density of compressed air energy storage technology: traditional supplementary combustion compressed air energy storage technology Directly discharge the heat of compression to the atmosphere; although the advanced adiabatic compressed air energy storage system uses the heat accumulator to store the heat of compression, the energy grade of the heat of compression is reduced due to the inevitable heat exchange temperature difference in the heat exchange process; isothermal The compressed air energy storage system can use all the heat of compression for the expansion process, but the technology is complex and it is difficult to store it efficiently

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