HGSSP - A computer program for simulation of once-through boiler start-up behavior

In this study a computer program, HaGuo Start-up Simulation Program (HGSSP) , for thermal-hydraulic analysis is developed for simulation of start-tip b ehavior of a once-through boiler equipped with various integral separator s tart-up systems. With the simulation results, design principles for optimiz ing a start-tip system for design and optimization of start-tip procedures for operation, which will result in minimum start-up losses by reducing the start-lip time its much as possible, can be obtained. On the basis of Dole zal's model, an improved analytical-numerical method is proposed to solve t he coupled energy equations for flue gas and working fluid describing the t ransient heat transfer occurring in individual heating surfaces. In order t o verify the program presented here, the cold start of a 600-MW supercritic al once-through boiler located in China oil July 6, 1993, is simulated and a comparison with measured data made. This comparison indicates reasonable agreement between the computational main steam pressure, water separator le vel, and drain flow, economizer inlet and outlet temperatures, economizer p ressure, and final superheater inlet temperature and those measured. Finall y, the standard cold and hot start-up processes of a Harbin Boiler Works su percritical once-through boiler are simulated with HGSSP to acquire the sta rt-lip curves and suitable drain valve dimensions corresponding to a predet ermined pressure-raising curve.