Abstract
Low temperature (<1000 °C) preheating combustion technique with low NOx emissions has been applied to semi-coke combustion and make a good success. However, the de-NOx potential of higher preheating temperature (>1000 °C) has not been reported. Aiming to acquire a lower NOx emission, the preheating combustion technique with a higher preheating temperature (>1000 °C) has been tested on a two-stage drop-tube furnace in this paper. This work mainly focused on the preheating temperature and the combustion temperature these two factors on the NO emission and burnout characteristic. Results showed that higher preheating temperature (>1000 °C) could further lower the NO emission and enhance the combustion efficiency due to the early conversion of char-N to N2. The NO reduction percentage can reach as high as 74% as the preheating temperature increased to 1400 °C. Moreover, the NO reduction degree was more significant in the fuel-rich conditions (i.e., α < 1). Meanwhile, the higher preheating temperature is also conducive to burn out for the early ignition of semi-coke. The effects of combustion temperature on NO emission strongly depend on the stoichiometry parameters. In air-deficient conditions, the NOx emission decreased with increasing temperature, whereas in oxygen-rich conditions the opposite trend occurred. The critical excess air ratio in this paper is around 0.95.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
