Design And Simulation Research Of 700? Ultra-supercritical Double-reheat Oxy-coal Fired Boiler Unit

China is a fossil fuel-based countries,thermal power still accounts for about 65% of the power industry,is an important source of environmental pollution.The treatment of environmental pollution and improve the efficiency of power plants are far behind in foreign countries,with the gradual improvement of stricter environment protection rules and laws,the thermal power plant pollutant emissions requirements are gradually increased.As one of the best ways to reduce the CO2 emission of thermal power plant,the combustion technology of oxygen-rich pulverized coal is attracting more and more scholars' attention.The oxy-coal gas is make up of pure oxygen obtained from air separation and a part of the recycle flue gas instead of air as oxidant of oxy-coal combustion.Thus,the flue gas can be zero CO2 emissions after purification treatment of flue gas compression by the improvement of the mole fraction of CO2.700 ? ultra-supercritical double-reheat technology has advantages of higher efficiency of unit and low carbon emissions,can make up low cycle efficiency defects of oxygen-rich coal-fired boiler unit.The combination of these two technologies can realize the requirements of energy-saving and emission-reduction for thermal power generation.Therefore,it is necessary to design and study the operation characteristics of the 700?ultra-supercritical double-reheat oxygen-rich coal-fired boiler unit for coal-fired power plant development and breakthrough.Based on the working mechanism of the oxygen-rich coal-fired boiler unit,according to the boiler capacity,parameters and fuel characteristics,from the furnace structure,the selection of major equipment and the layout of the heating surface,700?ultra-supercritical double-reheat oxygen-rich coal-fired boiler unit to carry out preliminary design;Then,the boiler unit is decomposed into various subsystems,the dynamic mathematical model of the process and equipment in each subsystem is established,and the computer program is transformed into Fortran language,with the integrated model development platform GenSystem to establish the simulation model of each system,and the actual operation of the system between the interconnected to form the entire 700 ? ultra-supercritical double-reheat oxygen-rich coal-fired boiler unit simulation model;Then,the main structural parameters of the boiler unit are obtained through the calculation model to carry on the design calculation;Finally,with the aid of GenSystem simulation support platform,the BMCR condition,Through the simulationexperimental research of combustion and wind-smoke system,steam-water system and other major equipment,the change rule of the main operation data of the boiler unit was obtained,and the operation characteristics of the related system and equipment were analyzed.It is great reference value for the design and safety economic operation of700? supercritical double-reheat oxygen-enriched coal-fired boilers.