机组非稳态工况下锅炉中的热量分布

对在机组较大幅度变负荷、启停等非稳态过程中锅炉的热量分布进行了研究.首先对非稳态工况下燃料释放热量的去向进行了理论分析,然后建立了用于各受热面基本参数计算的锅炉动态模型、各受热面热量分布和锅炉中总的热量分布的计算模型,最后以实例进行了计算,得到了某时刻锅炉中的热量分布和某段时间内用于金属温度及工质参数升高的热量变化.通过对锅炉进行热量分布的计算分析,可使机组人员更加全面地掌握机组在非稳态工况下的运行状况,并为机组运行提供更加全面的运行指导.

Heat Distribution in Utility Boilers Operating Under Unsteady Operating Conditions

Heat distribution in boilers under unsteady operating conditions,such as in case of large load variations,start-up or shut-down of power generating sets,is being studied.First of all,the terminvs of heat flow quantities,released by the fuel,under unsteady operating conditions,is theoretically analyzed;in a following step a dynamic boiler model for calculating the basic parameters of all heat delivery surfaces,models for calculating the heat distribution in all the heat delivery surfaces as well as for the general heat distribution in the boiler are built.At last,by calculating an actual example,the heat distribution in a boiler,at a certain instant,is obtained,as well as the amount of heat used for raising the metal's temperature and for lifting the working medium's parameters,during a certain time interval.Calculations and analyses of general heat distribution in boilers enable power set operators to master,to a better degree,the equipment's state under unsteady operating conditions,thus providing a more all-embracing operation guidance.