Abstract
The experimental bench for the pyrolysis characteristics of single droplets of urea solution was established to analyze the variation characteristics of the whole process of single droplet evaporation pyrolysis. The results show that there are a large number of bubbles in the droplets which are very favorable for pyrolysis, the pyrolysis energy and atomization degree are insufficient, leading to the formation of intermediate products, greatly reducing the efficiency of denitrification. Based on the experimental data, the urea pyrolysis system was developed and designed for the SCR denitrification project of a coal-fired boiler in a thermal power plant, and key equipment was optimized, including urea storage and supply system, denitration reactor system, spray gun device, pyrolysis furnace body, etc. The system was put into operation. After that, the NOx concentration was reduced from 250mg/Nm3 to 20 mg/Nm3, and the denitration efficiency reached over 90%. The project has strong engineering application value.
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