Thermoeconomic Analysis And Optimization For The Secondary Loop Of Nuclear Power Thermal System

In recent years, nuclear energy, as an important breakthrough in solving energy crisis,has developed rapidly in our country, how to utilize it safely and efficiently has become a significant topic we concerned about. With the rapid economic development, the state that saving energy but uneconomic, is not suitable for the survival and development of the nuclear power plant. Based on the thermomechanical analysis, thermoeconomics analysis has a significant meaning on improving the economy of unit operation, bringing huge economic benefits to the enterprise and our country, saving energy and improving the environment, with the economic factors considered when evaluating on the performance of the systemThis paper takes the secondary loop of 1000MW nuclear power thermal system as the research object, the productive structure of the system and the Fuel-Product of the subsystem has been established based on the structural theory, and the exergy and thermoeconomics cost analysis has been calculated using Matlab software. The calculation results show that the steam generator is the equipment of the system which has the largest irreversible exergy loss,thus has a good energy saving potential. The unit exergy cost of fuel and product for every device increase gradually follow the direction of thermodynamic cycles. LIFO model has been applicated to improve the thermoeconomics productive structure model, combined with the mathematical derivative chain rule, the cost of the productive process and the terminal product has been calculted, the conclusions highly consistent with the ones structural theory obtained, and they are more reasonable. The power generation cost is $0.010 per kWh, it provides an important reference for the pricing determination of the terminal product.Application the genetic algorithm to optimize the system analysis, 12 main parameters are selected, the unit thermoeconomic cost as the objective optimization function. After the the optimization, the steam generator and steam turbine has 1798kW exergy loss reduces, and the investments cost is reduced by $533744. After the optimization, the unit thermal economics cost of the system reduced 4.06%, the investment cost of system equipments is reduced by 0.38%, the power generation cost reduces 1.77 percents.Thermoeconomics analysis and optimal design of the secondary loop of nuclear power thermal system has important practical significance in reducing the power generation cost,raising the unit efficiency and improving the environment etc.. provides a completed set of evaluation and optimization platform at the same time.