Flow Model Test And Numerical Simulation Study For Flue Gas SCR Reactor Of660MW Capacity Thermal Power Units

Our country is a coal as the main primary energy, the proportion is as high as75%, and coal is still have most abundant in the primary energy of proven reserves.The composition of primary energy determines the capacity thermal power is themajor in our country. For a long time, coal-fired thermal power unit installed capacityin a higher level, thermal power generation accounts for the proportion of the totalgenerating capacity remain at around80%.Because of gas is less and coal is rich inour country, the energy structure determines the basic pattern of our country’s electricpower industry is given priority to with coal, but from the burning of coal nitrogenoxide are the serious influence our country environment, along with the2011editionof the new "the standard of power plant air pollution emission" formally implemented,the standards of control nitrogen oxides emissions is more strict, and it’s become abig problem to be solved by power industry.Selective catalytic reduction (SCR) technology is one of the most widely in theengineering application of denitration technology, its utility ratio accounted for morethan90%of the denitration project. This article detailed introduces the nitrogenoxides emission and control of the status in the globe, and the basic principle anddevice applications of selective catalytic reduction (SCR) technology,.The SCR denitration system for660MW coal-fired units in a power plant, weaccording to the size of a similar principle to build the1:12physical fluid model,under the condition of cold of SCR device related model experiment was carried out,on the original design model of velocity field and the concentration of the reducingagent distribution has carried on the experimental measurements. At the same time,the computational fluid dynamics software STAR-CCM+on the integration ofmodeling, meshing and numerical simulation, etc. Based on the results of experimentin model and numerical simulation, analyzes the problems existing in the originaldesign, aiming at the problems existing in the design of the original model, byadjusting the flue guide device layout Angle and ammonia injection allocationoptimization adjustment, achieve SCR system of flue gas flow velocity field, the distribution of ammonia concentration field uniformity requirements.The results show that the theoretical results fit well with the results of numericalsimulation and model experiments, for SCR system optimization provides atheoretical basis. Finally, the paper summarizes optimization scheme for the SCRdenitration system, the conclusion can provide reference for similar SCR deviceoptimization.