AUTHOR=Liu Haili , Hong Qingchao , Liu Heyun , Huang Zhen , Zhang Xu , Chen Wang , Zeng Xi , Pan Shulin 

TITLE=Effects of Temperature and Additives on NOx Emission From Combustion of Fast-Growing Grass

JOURNAL=Frontiers in Energy Research

VOLUME=9

YEAR=2021

URL=https://www.frontiersin.org/journals/energy-research/articles/10.3389/fenrg.2021.772755

DOI=10.3389/fenrg.2021.772755

ISSN=2296-598X

ABSTRACT=<p>Fast-growing grass, as a popular renewable energy, is low in sulfur content, so NO<sub><italic>x</italic></sub> is the major pollutant during its combustion. To study the emission characteristics of NO<sub><italic>x</italic></sub> and obtain the data of controlling NO<sub><italic>x</italic></sub> emission, the effects of combustion temperature as well as the additive type and mass fraction were investigated on the emission characteristics of NO<sub><italic>x</italic></sub> from the combustion of fast-growing grass. Results revealed that the first peak for NO<sub><italic>x</italic></sub> emission from this combustion gradually increases with an increase in temperature. Moreover, the additives were found to dramatically impact the amount of NO<sub><italic>x</italic></sub> emission and its representative peak. The optimal additives and their optimal mass fractions were determined at various specific temperatures to reduce NO<sub><italic>x</italic></sub> emission. At combustion temperatures of 600, 700, 750, 800, and 850°C, the optimal conditions to limit NO<sub><italic>x</italic></sub> emissions were 5% SiO<sub>2</sub>, 3% Al<sub>2</sub>O<sub>3</sub>, 3% Ca(OH)<sub>2</sub>, 15% Al<sub>2</sub>O<sub>3</sub>, and 3% SiO<sub>2</sub> (or 3% Al<sub>2</sub>O<sub>3</sub>), respectively; the corresponding emission peaks decreased by 43.59, 44.21, 47.99, 24.18, and 30.60% (or 31.51%), with denitration rates of 63.28, 50.34, 57.44, 27.05, and 27.34% (or 27.28%), respectively.</p>