A CO2-capturing hybrid power-generation system with highly efficient use of solar thermal energy

Evaluation of CO2-capturing Power Generation Systems Utilizing Waste Heat from Ironworks.

“…7) Major exogenous variables and parameters used for estimation are listed in Table 1. The values in the tables are based on previous analyses performed by the author on a variety of power generation systems, [2][3][4][5] and are considered to be realizable by applying present technologies.…”

“…Since the pressure of the saturated steam with temperature 200°C is 1.55 MPa, we can see that the steam condition is worse compared to the case of utilizing the waste heat from a garbage incineration plant where steam temperature could be assumed to be 275°C and pressure 2.16 MPa. 3,5) In evaluating the conventional system, condenser outlet pressure gives a great influence on its efficiency, so it was changed from 4.9 kPa by 4.9 kPa and the optimal value was searched in the meaning that the highest efficiency is attained. It was imposed that the dryness of steam at turbine outlet should be higher than 89 % from the technological reason for steam turbine.…”

“…It has been shown that the proposed system could have the possibility of economical feasibility as for a case of using the waste heat from a garbage incineration plant. 5) The quality and quantity of waste heat, however, differ greatly according to its source. CO 2 -capturing power generation systems proposed by the author are based on gas turbine technology, so that various systems with different cycle can be constructed such as a system with regenerative cycle other than Brayton cycle, and thermodynamic characteristics and economics of the system also differ greatly according to its cycle.…”

Exergetic utilization of solar energy for feed water preheating in a conventional thermal power plant

“…They concluded that fuel is utilized in an excellent exergetical way in the system because the methane is used for raising the steam temperature higher than 10001C. Pak et al [13] concluded that in CO 2 capturing solar thermal hybrid system the solar thermal utilization efficiency is considerably higher than that for conventional STPPs. Kribus et al [14] carried out feasibility study of combined cycle power plant, incorporating the new developments in solar tower optics and high-performance air receivers, only with solar operation at design point and hybrid operation to provide full capacity at all times.…”

Characteristics and economic evaluation of a CO2-capturing repowering system with oxy-fuel combustion for utilizing exhaust gas of molten carbonate fuel cell (MCFC)

“…This deteriorates the efficiency of CO 2 -capturing system and its economics. To alleviate these shortcomings, one of the authors has proposed power generation systems based on oxy-combustion methods, in which solar thermal energy or waste heat from factories is used [9][10][11][12]. Shortcomings of these proposed systems are that system location is limited to sites where a large quantity of solar thermal energy or waste heat with relatively high quality is available.…”