Integrated energy systems based on cascade utilization of energy |
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Authors: | Jin Hongguang Gao Lin Han Wei Li Bingyu and Feng Zhibing |
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Affiliation: | (1) Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing, 100080, China;(2) Institute of Engineering Thermophysics, Graduate University of Chinese Academy of Sciences, Beijing, 100080, China |
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Abstract: | Focusing on the traditional principle of physical energy utilization, new integration concepts for combined cooling, heating
and power (CCHP) system were identified, and corresponding systems were investigated. Furthermore, the principle of cascade
utilization of both chemical and physical energy in energy systems with the integration of chemical processes and thermal
cycles was introduced, along with a general equation describing the interrelationship among energy levels of substance, Gibbs
free energy of chemical reaction and physical energy. On the basis of this principle, a polygeneration system for power and
liquid fuel (methanol) production has been presented and investigated. This system innovatively integrates a fresh gas preparation
subsystem without composition adjustment process (NA) and a methanol synthesis subsystem with partial-recycle scheme (PR).
Meanwhile, a multi-functional energy system (MES) that consumes coal and natural gas as fuels simultaneously, and co-generates
methanol and power, has been presented. In the MES, coal and natural gas are utilized synthetically based on the method of
dual-fuel reforming, which integrates methane/steam reforming and coal combustion. Compared with conventional energy systems
that do not consider cascade utilization of chemical energy, both of these systems provide superior performance, whose energy
saving ratio can be as high as 10%–15%. With special attention paid to chemical energy utilization, the integration features
of these two systems have been revealed, and the important role that the principle of cascade utilization of both chemical
and physical energy plays in system integration has been identified. |
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Keywords: | system integration cascade utilization of energy CCHP polygeneration system multi-functional energy system (MES) |
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