Staring Hrsg Hydrodynamic Circle Idiocratic Calculate And Numerical Simulation

HRSG is one of the main equipment in the Gas Steam Combined Cycle(GSCC).The design of HRSG is in fast development to adapt to Combined Cycle mutative circulate condition.Gas turbine’s power is more and more bigger, this means that HRSG will accept higher exhaust soot and onflow airflow.In upright natural circle HRSG, soot flow at upright direction, water and vapor flow at level direction. Natural circle HRSG rely on the difference of density in degressive pipe and uplifted pipe to make liquid flow in a close circle.Because natural circle HRSG don’t need outside power, so it is important to design correct circle.The paper combine ji nan steel mill sinter HRSG, introduce its basic frame.First, we did thermodynamic and obtain parameter we need in hydrodynamic calculate and Simulation. The paper building HRSG level evaporator pipes single phase and multiphase hydrodynamic math model, rely on the boiler hydrodynamic calculate method, we did program compute about complex circle HRSG evaperator, and acquire every row’s friction resistance expense and local resistance expense.At the same time, we did coupling compute about the whole evaporator. Accout to these compute result, respectively protract all pipes’hydrodynamic character curve, and verify the single characterAEndothermic condition hydrodynamic character simulation result indicate that pipe obtained more heat flux is smaller.Because of gravity, the flow in pipe is layered.The simulation of evaporator in no heated condition indicate that flux in pipes is equality, flux between pipe row also is relatived equality.So, we can consider that this kind of frame has little effect on flux windage.Made an analysis at no heating40%burthen60%burthen80%burthen and100%burthen five working condition.Research indicate that with the change of burthen, flux also change.Relative to no heating working contion, the others are diffent. The fist and second circle loop’s flux increase and the left two loop diminish.The change of heat burthen makes little change for pipe of each row.The change of heat burthen affect the distributing of flow and sectional vapour ratio, with the heat burthen increase, the sectional vapour ratio increase.