Title: Evaluation of Characteristics and Economics of A CO2-Capturing NOx-Free Repowering System — In the Case of Utilizing Middle Pressure Steam in a Ther
Abstract: It is becoming more important to reduce CO2 emission. Economical direct CO2-capturing systems are considered to be necessary in the near future for drastically decreasing the emission of CO2. It is technologically easy to capture CO2 from combustion gas if pure oxygen, instead of air, is used to burn fuel. To produce pure oxygen, equipment for oxygen production and extra energy are required compared when no oxygen is produced. A CO2-capturing NOx-free H2O turbine power generation system has been proposed in which middle pressure steam produced in a thermal power plant is utilized to increase generated power when demand for electricity is large. The proposed system can capture all the generated CO2 based on the oxygen combustion method and emits no NOx so that it causes no urban and global environmental problems. A combined cycle power generation system with 200 MW gas turbine power output is adopted as an example of a thermal power plant. It was assumed that 32 t/h of steam with 2.45 MPa (25 kg/cm2) pressure produced at a waste heat recovery boiler was utilized in the proposed system. It has been shown through simulation study that increase of power output by 11.9 MW or 4.54% of the rated output is possible with efficiency decrease by 0.2%. The amount of CO2 reduction is estimated to be 19750 t/y. The unit cost of generated power is estimated to be 8.64 yen/kWh, depreciation year 5.11, and thus the proposed system is estimated to be economically feasible.
Publication Year: 2003
Publication Date: 2003-01-01
Language: en
Type: book-chapter
Indexed In: ['crossref']
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