Open AccessSimulation Study on Urea Thermal Decomposition for SCR Process of Thermal Power Plant
Author(s) -
Xin Yu,
Yi Liu,
Yu Zhou,
Yanpeng Wang,
Yang Zhang,
Yue Zhu
Publication year - 2020
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/555/1/012050
Subject(s) - thermal decomposition , catalysis , hydrolysis , urea , chemistry , pyrolysis , reducer , decomposition , atmospheric temperature range , activation energy , inorganic chemistry , organic chemistry , thermodynamics , physics
Urea was used for SCR reducer in many power plants, but its pyrolysis process was very complex, and this process was showed by the TGA-DSC experimental results. An effective method for urea-water solution thermal decomposition was investigated in this paper. The factors of temperature, O 2 concentration and catalyst had been mainly studied and analyzed. It can be concluded that in range of 200-650 °C, with temperature increasing, the NH 3 conversion rate increased, HNCO could be hydrolyzed to produce NH 3 and CO 2 when temperature was higher than 400 °C, and the NH 3 conversion rate was higher than 50%, and the maximal NH 3 conversion rate was 85.1% when temperature was 650 °C; NH 3 conversion rate decreased with O 2 concentration in carrier gas increasing. More NH 3 was produced by hydrolysis of HNCO on SCR catalyst below 400 °C, because the hydrolysis of HNCO took place at temperature lower than 400 °C mainly, however, the promotion of catalyst for hydrolysis of HNCO was not observed at higher temperature.