Research Of Two-stage Flue Gas Denitration Filter And Denitration Technology

Coal-fired power plant gas contains large amounts of fly ash, which cause SCR catalyst reactor wear and poisoning, shorten catalyst life and increase operating costs and reduce the stability and reliability of device. In the economizer between exports and SCR reactor, a pre-removal processor was installed for gas pretreatment to remove some dust, to slow down the deactivation of catalyst, to improve coal-fired power plant flue gas denitration efficiency and reduce nitrogen oxide matter emissions, and to reduce pollution of the environment.Fluent,a general computational fluid dynamics software, is used on the gas-solid flow in the new filter to make the three-dimensional numerical simulation, and to analyze the flow resistance losses. Discrete phase model (DPM) was applied to simulate the trajectory of solid particles, and the collection efficiency of solid particles was analyzed. Through comparative analysis of five precipitator obtained:â…¤structure of the collection efficiency is the best, and the resistance loss is also less than 100Pa. According to similarity theory, analyzed of the simulation pressure drop and the similar conditions of the collection efficiency, designed Cold physical model, One-fifth of Pre-kind pre-dust device, and model the experimental system. The results show that: with the increase of gas flow rate, the increase of the pressure drop, the reduce of the collection efficiency. At a flow rate of 5.8m/s when,â…¤structure of the integrated dust removal efficiency is 37.64%, and the resistance loss is 118Pa. Simulation and experiment's best structure is the same.Therefore, numerical simulation and experimental results are in good agreement.In order to verify the influence of the fly ash to the SCR catalyst reactor, SCR DeNOx experimental apparatus is established . In the controllable and the ideal gas conditions, study the influence of fly ash concentration and SO2 concentration to the SCR DeNOx performance, the experimental results show that: SO2 efficiency of flue gas denitration has little effect on the smoke and ash significantly influenced the denitration efficiency. With the increase of the concentration of fly ash,the denitration efficiency reduces. When the fly ash concentration is 60g/m3, the denitration efficiency is only 75.3%, so it is necessary to load the pre-filter.