Study Of Design And Operation Property For 700? Ultra Supercritical Boiler

700 ? ultra-supercritical coal-fired power generation technology could effectively improve the efficiency of thermal power unit, and reduce power generation coal consumption and pollutants discharge. It 's not only an important initiative for optimizing and readjusting industrial structure which is now mainly depending on coal; but also an request to realize the clean and efficient utilization of coal resources, and promote energy conservation and emissions reduction in depth. It is also the important content of national energy str ategy. Therefore, the research and demonstration of 700? power generation technology could improve the independent research level of key energy technology and equipments in China.This paper firstly introduces the current situation of the research and development of 700? ultra supercritical boiler, and the key problems in the design of the boiler was discussed. The bigger key problem is that heat exchange quantity of the super-heater and re-heater system gets bigger, which brings difficulty to the arrangement of heat exchange surface. On this basis, for a 700 ? 660 MW ultra-supercritical coal-fired boiler, the choice of designed coal, the selection of auxiliary equipment system and arrangement of heating surface, including super-heaters, re-heaters, economizer, and the water flow were carried on. The main mathematical model adopted by the design and calculation was introduced.Using the method of computer software programming, the mathematical model was established. And this could not only improve the computational efficiency, but also make it convenient to study its operation property. The 700? ultra supercritical boiler was categorized into several systems. According to the system, and the mathematical model of every equipment and process, calculation model of various equipments and processes in subsystems were built with the aid of Gen System. The structure size of the pre-arranged surface was input into the computational model. The computational model could be modified in the process of calculation, till the structure size meets the demand. By using the computational model, under different circumstances, experimental researches were conducted in 700? ultra supercritical boiler, which included transformation of the flue gas damper opening, feed water temperature, excess air coefficient, feedwater quantity and coal quantity. The influence to furnace outlet flue gas temperature and the exhaust gas temperature were analyzed, especially to the steam temperature.