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Proposal and characteristics evaluation of a CO 2 ‐recovering hybrid power generation system utilizing solar thermal energy
Author(s) -
Pak Pyong Sik,
Hachikawa Takeshi,
Suzuki Yutaka
Publication year - 1996
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/eej.4391160505
Subject(s) - nuclear engineering , solar energy , superheated steam , thermal efficiency , thermal , thermal power station , steam electric power station , combustion , process engineering , electricity generation , environmental science , photovoltaic thermal hybrid solar collector , materials science , working fluid , thermal energy , automotive engineering , mechanical engineering , steam turbine , turbine , power (physics) , combined cycle , engineering , waste management , electrical engineering , thermodynamics , chemistry , physics , organic chemistry
A CO 2 ‐recovering hybrid power generation system utilizing solar thermal energy is proposed. In the system, relatively low temperature saturated steam around 220°C is produced by using solar thermal energy and is utilized as the working fluid of a gas turbine in which generated CO 2 is recovered based on the oxygen combustion method. Hence, solar thermal utilization efficiency is considerably higher as compared with that of conventional solar thermal power plants in which superheated steam near 400°C must be produced for use as the working fluid of steam turbines; the requirement for solar radiation in the location in which the system is constructed can be significantly relaxed. The proposed system is a hybrid energy system using both the fossil fuel and solar thermal energy, thus the capacity factor of the system becomes very high. The fuel can be used exergetically in the system; i.e., it can be utilized for raising the temperature of the steam heated by utilizing the turbine exhaust gas more than 1000°C. The generated CO 2 can be recovered by using an oxygen combustion method, so that a high CO 2 capturing ratio of near 100 percent as well as no thermal NO x emission characteristics can be attained. It has been shown through simulation study that the proposed system has a net power generation efficiency of 63.4 percent, which is higher than 45.7 percent as compared with that of the conventional power plant with 43.5 percent efficiency, when the amount of utilized solar energy is neglected and the temperature of the saturated steam is 220°C.