Economic Analysis Of A 660MW Unit With Double Reheat Cycle

The unique energy feature of “poverty of oil, scarcity of gas, and affluence of coal” determine the dominant position of coal fired electric power industry in China. Technology of supercritical power unit with double reheat cycle is one of the most effective ways, which has the characteristics of cleanness and effectiveness. Therefore, it is of vital significance for further investigation of the unit with doub le reheat cycle. Considering the theoretical research and engineering practice, a coupled method combining the exergy analysis and thermoeconomic theory can achieve the potential results of a supercritical power unit with double reheat cycle objectively, w hich can provide a thorough reference for practical applications.Based on the matrix model of exergy loss distribution and unit consumption analysis, exergy efficiency, exergy losses and additional coal consumption of the system in a 660 MW supercritical power unit with double reheat cycle are investigated, and the reasons for the distribution of several performance indicators are examined. According to Emission Standard of Air Pollutants for Thermal Power Plants of our country, the discharging quantity of pollutants caused by additional coal consumption is explored. O n the basis of matrix model thermoeconomic, the distribution of unit thermoeconomic cost of each flow in the thermal system is investigated, and basic issues of unit thermoeconomic cost of the unit are studied. According to the concept of average unit thermoeconomic cost, the technical economy of major equipments in the thermal system is explored in the present paper.