Research On Integration Method And Thermodynamic System Algorithm Of Solar Aided Coal-fired Power Generation

Based on study of the parabolic trough solar collection system?photo voltaic/thermal collector(PV/T)with coal-fired unit thermodynamic system,to analyse the structure characteristics and working principle of parabolic trough solar collection system and PV/T,it designed loop double fluidic channels water-cooled CPC-PV/T system with serpentine ramp type mode channels,and studied their integration mechanisms and performances with coal-fired unit thermodynamic system.In view of the cooling fluid flow characteristics in the solar collector,in order to overcome deterioration of heat transfer caused by two-phase flow and avoid flow separation,volume expanding evaporative steam generation(VEESG)system including the drain reflux and recycle two kinds of operating mode will be put forward,using volume expanding evaporator instead of steam-water separator to make integration and optimization between solar collection system and coal-fired thermodynamic system through the coupling mechanism research of two systems.Besides two steam generation system mentioned above,solar preheating systerm several different ways of solar thermal utilization were proposed to analyse the different integration methods of solar aided coal-fired power generation system,based on cyclic functional method and q-?-? matrix,the solar thermal utilization system was merged into the main cyclic system of coal-fired unit,unit inlet-water coefficient matrix equations of each mass unit of thermodynamic system are constructed in different coupling models,then a general matrix model of unit inlet-water coefficient about the solar aided coal-fired power generation system was put forward,which has a strong regular form,the matrix algorithm makes the thermodynamic properties and structure characteristics of coal and solar integration system convert into computer language,so the analytical calculation of thermal system presents programmatic,accurate and concise,and the matrix equation has general applicability,analytical calculation of an example is given to illustrate validity of the method,it provides theoretical support for solar energy efficient utilization on a large.Based on the mass unit matrix algorithm and the general matrix model of unit inlet-water coefficient derived,it worked out the unit thermal economy variation tendency and the best back water position of the drain in volume expanding evaporator when the different stage extraction steam of unit replaced by the exit steam of drain reflux VEESG system super heater region;Two kinds of schemes of solar preheating system auxiliary heating unit feed water(condensation)thermal efficiency were analyzed.And it put forward drain reflux VEESG system on the application of CO2 capture technology in coal-fired power plant,the coupling mechanism research of drain reflux VEESG system,amidogen CO2 capture system and unit thermodynamic system were elaborated,it worked out the unit thermal economy variation tendency of the unit with amidogen CO2 capture system and the best back water position of the drain in volume expanding evaporator and saturated water in reboiler when powered by solar energy.