A hybrid power system based on coal
pyrolysis and steam integration
is proposed to improve the performance of power plants. The most outstanding
features of the system are a pyrolysis process integrated with a circulating
fluidized bed boiler and power generation by the steam integration.
The model of the hybrid power system is set up by THERMOFLEX software
and Aspen Plus. Results show that the thermal efficiency of pyrolysis
process can achieve values of 90%–95%, and the majority of
the energy used by the pyrolysis is consumed during the drying and
quench processes. Compared with a conventional steam cycle power system,
the gross electric efficiency and thermal efficiency of the new system
are increased by 1.9% and 5.1%, respectively. Energy and exergy analyses
are presented to study the performance differences of two systems.
Exergy destruction of the boiler with steam integration is decreased
in the new system. Exergy destruction of gas turbines is lower than
that of the boiler. Although additional exergy loss occurs in the
pyrolyzer and heat recovery steam generator, the overall exergy loss
of the new system is less than that of the conventional system.
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