Investigation on the interaction of NH3&CH4 co-activated char under reburning conditions.

In the current global context, there is a pressing need to curtail greenhouse gas emissions, making the utilization of a coal and zero-carbon energy blend an imperative strategy for reducing carbon emissions from coal-fired power generation. The planar flame burner serves as a tool to simulate the temperature and atmospheric conditions within the reburning zone, facilitating extensive examination of the physical and chemical structural alterations, as well as the nitrogen oxide reduction potential, during NH 3 /CH 4 activation for reburning pulverized coal. Experimental results underscore that blending high-activity fuels optimizes the combustion performance of coal char. Through the addition of NH 3 and CH 4 , the NO reduction capability of coal char is bolstered by approximately 0.67 times compared to sole reliance on recirculating flue gas transport. Furthermore, NH 3 introduction facilitates the conversion of C]O double bonds into C–O single bonds, rendering them more amenable to reduction by NO. While the joint influence of NH 3 and CH 4 does not significantly impact char particle size, it does foster the evolution of N-Q to N-5 and N-6 on the char surface. Furthermore, there was a significant increase in the BET-specific surface area, which rose by 50%. Additionally, the total pore volume increased by approximately 21.43%. The comprehensive understanding of NH 3 and CH 4 modified pulverized coal reburning technology holds significant promise for optimizing power plant operations and mitigating carbon dioxide and nitrogen oxide emissions. [Display omitted] • The addition of CH 4 has no significant effect on the particle size of char. • The reducibility of coal char modified by NH 3 &CH 4 increased by nearly 0.67 times. • The addition of NH 3 promotes the conversion of C]O to C–O. • The addition of NH 3 &CH 4 promotes the evolution of N-Q to N-5 and N-6. • The specific surface area and total pore volume of char were both increased. [ABSTRACT FROM AUTHOR]