Research Of The Cold Flow Model Building And Testing Methods In The Gas De-NO_x Engineering

At present, China’s thermal power generation capacity has exeeded 400 million kilowatts, most of which are coal-fired units. The volumes of SO2 and NOx discharged mainly by thermal power plants continue increasing. Although the detriments caused by NOx are obvious, China’s thermal environmental protections mainly focus on desulfurization, while the control of NOx emissions is still in its infancy. There is still a big gap in the comparison with advanced counries in the world. The core technologies of gas De-NOx engineering that need research are CFD, cold model building, test methods and real-time control system. And the cold model building and test methods are introduced and put into detail.In the comparison of cold model principle, design and experimental data analysis of the gas De-NOx Engineering of 300MW, 660MW, 1000MW power plant, and research has been conducted to the design principles, design methods, experimental methods and data analysis methods applicable to the majority of fire power plants. A theoretical and practical basis is provided for design and optimization of De-NOx reactor. The design,construciton and application of Flow Model Test (FMT) equipment are introduced for validating Computational Fluid Dynamics (CFD) simulation for the flow state of high speed ammonia-smoke mixing process and guiding the design of real De-NOx reacter. Based on the theory of Experiments in Fluid Mechanics,the 300MW 12:1, 600MW 15:1, 1000MW 20:1 FMT design specifications are presented according to the parameters of real De-NOx reacter, and the type selection and design proess of cold flow model modules are put into detail. And after that, the testing of velovity and gas concentration distribution at the first layer of simulated catalyst and pressure distribution are secperately proceed on the three cold models, and the data are processed and analyzed, which reach the recent engineering requirements.