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A novel coal-based polygeneration system with CO2 recycling for CO2 capture is proposed. Two CO2 recycling schemes exist in this system. In the first, CO2 is recycled into the gasifier as the gasifying agent. In the second, CO2 is recycled into the gas turbine as a diluent. Compared with conventional CCS systems, this new system avoids the use of water gas shift and CO2 separation processes to capture CO2, and, more importantly, a part of CO2 can be converted into CO in coal gasification and be used to synthesize chemicals, improving carbon element utilization and chemical output. By means of exergy analysis, comparison with four conventional single production systems shows that the proposed system provides more than 11% in energy savings and more than 25% in capital investment saving. The exergy efficiency, CO2 emission, and internal rate of return may be expected to reach 46.3%, 0.47 t·(t-coal)−1 and 14.76%, respectively.

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Due to the heavy stress on environmental deterioration and the excessive consumption of fossil resources, the transition of global energy from fossil fuel energy to clean energy has significantly accelerated in recent years. The power industry and policymakers in almost all countries are focusing on clean energy development. Thanks to progressive clean energy policies, significant progress in clean energy integration and greenhouse gas reduction has been achieved around the world. However, due to the differences in economic structures, clean energy distributions, and development models, clean energy policy scope, focus, and coverage vary between different countries, states, and utilities. This paper aims at providing a policy review for readers to easily obtain clean energy policy information on various clean energies in the U.S. and some other countries. Firstly, this paper reviews and compares some countries’ clean energy policies on electricity. Then, taking the U.S. as an example, this paper introduces the clean energy policies of some representative states and utilities in the U.S in perspectives of renewable energies, electric vehicles, and energy storage.

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