Abstract
Based on the fact that NOx generation will be inhibited under the condition of high equivalence ratio, the micro-combustors with double-rib structure partially inserted with porous medium (PM) are selected to examine the NOx emission performances in fuel-rich combustion of ammonia. The effects of: 1) the inlet velocity, 2) the porous material and 3) the porosity are evaluated on NOx emission reduction. Besides, the kinetic rate of key reactions contributing NOx production are analyzed. It is found that, the PM can effectively reduce NO generation and emission under a larger inlet velocity. With the increased thermal conductivity of porous material, the emission of NO is shown to be decreased by 99.98% from 2.70 × 104 ppm to 5.17 ppm, while N2O emission is increased by 10000% from 24.8 ppm to 2.52 × 103 ppm. In addition, the porous material with a higher thermal conductivity is beneficial to improving the uniformity of the combustor outer wall temperature. When the PM’s porosity is increased from 0.5 to 0.9, NO emission is increased by 4120% from 3.53 × 102 ppm to 1.49 × 104 ppm, while N2O emission is decreased by 71.5% from 3.29 × 103 ppm to 9.38 × 102 ppm. The present work reveals that the NOx emission can be effectively reduced, while increasing the thermal performance of micro-combustors by adopting appropriate porous medium.
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.
