Research On Optimization Of SCR Denitration System For F-Class Gas Power Station

Due to the increasingly serious air pollution,China’s environmental protection policy requirements are getting higher and higher.The thermal power unit is constantly undergoing technological transformation.Environmental protection such as desulfurization,denitrification,dust removal,and plump whitening has gradually become a "top priority" for the thermal power industry.In recent years,environmental protection departments have become increasingly strict with NOX emission concentrations in flue gas.Therefore,it is urgent to develop a denitration technology that is economical and reliable while meeting environmental requirements in the future.Among the many denitrification technologies,the selective catalytic reduction(SCR),which has a simple structure and stable performance and a denitration efficiency of up to 93%,stands out as the main choice for controlling the NOX emission concentration of gas-fired power plant waste heat boilers.Firstly,according to the SCR denitrification microscopic reaction mechanism and macroscopic performance,the key factors affecting the denitration efficiency are analyzed.Then,the SCR denitration system of a gas-fired power plant is taken as the research object.By establishing the model of the flue gas flow field in the flue,relying on FLUENT The software platform and its pre-processing software GAMBIT and post-processing software TECPLOT simulate and analyze the smoke flow field in this area.By installing the deflector or changing the characteristics of the heat exchange module to optimize the uniformity of smoke in the denitration system area.At the same time,the BP neural network structure is applied to the denitration control system,and the control mode of the denitration system is improved.Under the condition of meeting the NOX emission concentration and the ammonia escape standard,the optimal ammonia injection amount is realized.After simulation test and field simulation test,the results show that the optimized denitration system needs to reduce ammonia content under the premise of ensuring denitration efficiency and ammonia slip index.It can be further optimized based on this system model and finally applied to actual engineering projects.