Numerical Simulation And Structure Optimization Design Of De-NO_x System Of Flue Gas In Glass Furnace

With the promulgation of the new emission standard of NOx, the flue gas denitrationfaces great challenges in industrial furnaces. Glass furnace,as one of the industrialfurnaces ,whose NOx emission and control also receives much attention. How to improve thedenitration efficiency economically and effectively, and reduce the quantity of NOx emissionbecomes research focuses. Numerical simulation method is used to optimize the SCRDe-NOx system, which offers theoretical guidance for the layout mode design of fluestructure, static mixer and flow deflectors,and which is beneficial to denitration efficiency andour environment.Three-dimensional physical model of flue gas De-NOx system in glass furnace has beenestablished in this paper. Standard k-εmodel, species transportat model and porous mediummodel are used to imitate velocity distribution of flue gas and ammonia concentrationdistribution ,and then the construction is optimized continuously,the main conclusions are asfollows:(1) Structure optimization design schemes of flue gas De-NOx system in glass furnaceare proposed in this paper.The design is divided into three parts.The first part is flue structureoptimization,the second part is the layout mode design of static mixer,and the third part islayout mode design of flow deflectors.(2) Denitration system structure of the flue has great influence on the flow field.Whenthe left vertical flue of SCR denitration system applies gradually expanding section form,relative speed standard deviation in the catalyst beds is up to 18.4% , whereas applyingtapered cross-section, relative speed standard deviation decreases to 9.8%;While applyingequal cross-section, relative speed standard deviation in the catalyst beds decreases to merelyabout 8%.(3) Static mixer ,just below the the jets of ammonia, could obviously improve uniformityof ammonia concentration distribution in the catalyst beds.Meanwhile,the size of static mixergreatly affects the ammonia concentration distribution in catalyst layer. The ammoniaconcentration distribution becomes more uniform with the increase of size.(4)Layout mode of flow deflectors has impacts on the velocity distribution of flue gasand ammonia concentration distribution.In order to improve the uniformity of flow field in theflue.The optimization design method of adding vertical plates of flow deflectors in the innerflue and reducing the flow deflectors radian from outer to inter is proposed.Finally,simulationresults show that flow field and ammonia concentration distribution of catalyst beds place become more uniform.