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| Simulation and Optimization of SNCR System based on Fluent Circulating Fluidized Bed Boiler |
| LI Jie**, GAN Shukun*
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| (School of Mechatronic Engineering, Jilin Institute of Chemical Technology, Jilin City 132022, China) |
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Abstract In order to explore the influence of flow field and component concentration distribution on the denitrification efficiency and ammonia escape of SNCR device, and improve the denitrification performance of the device, a three-dimensional computational fluid dynamics model of the boiler denitrification system was established by computational fluid dynamics (CFD) simulation method, and numerical simulation was carried out. By simulating the selective non-catalytic reduction (SNCR) denitrification process of a circulating fluidized bed boiler of a 350MW unit in a plant, the effects of spray gun position, ammonia nitrogen ratio, ammonia spray angle and droplet size on SNCR denitrification effect were studied, and the SNCR denitrification system of the boiler was optimized. The results show that the denitrification efficiency increases with the increase of the molar ratio of ammonia to nitrogen after adjusting to the symmetrical spray gun arrangement. The increase of ammonia spraying speed and the increase of atomized particle size of reducing agent also have a certain impact on the denitrification efficiency and ammonia escape. After the optimization of the boiler SNCR system and operating parameters, the maximum denitrification efficiency reached 79.09%. The results of this study are helpful to improve the denitrification efficiency and provide an important reference for the actual transformation design.
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Published: 09 April 2025
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