Numerical Simulation On The Characteristic Of Steam Temperature Of Boiler With Gas Distribution Damper

The gas distribution damper is one of main application for the steam temperature control of utility boilers, particularly suitable for supercritical boiler of burning lean coal and anthracitic coal. Nowdays, along with the boiler capacity and parameter improve, generator adopts reheat system, which not only require boiler has good steam temperature adjustment ability, also requires its high thermal efficiency and adapt to peak-regulation.By numerical calculate flow differential equation, Computational fluid dynamics is concluded that the fluid flow in continuous area of discrete distribution, thus approximates get fluid flow condition. Commercial CFD software can efficiently solve various areas of the complex flow calculation problem.This paper using smoke wind resistance calculation and computational fluid dynamics numerical simulation technology, to the actual structure of domestic 300MW boiler shaf, get the physical simplified model of heating structure. Then, using computational fluid dynamics, calculated damper resistance characteristic.This method give the advantage of two calculation methods, avoids selected local resistance coefficient, and simplifies the vertical space in the boiler shafe, lower numerical simulation workload, guarantee the numerical simulation can fast convergence. Simulate various baffle opening flow conditions, through calculation on both sides of the smoke gas get baffle opening-flow characteristic relational, and then put this relational into relational thermal calculation, get the quantity change to reheat steam temperature and superheated steam temperature influence. It's for existing boiler design, calibration calculation and operation safety provides a new ideas and methods.